Explanation:
need help in a question u stuck in??
which of the folooiwng best accounts for the pressure in the vessel remaining constant as the volume decreasese below .21l
The volume of gas increases by 25% when the volume falls below 21 with the constant temperature.
PV=nRT is the ideal gas equation.
PV is constant and equals k because the temperature is also constant.
Because there is 20% less pressure, P 2 = 0.8P and PV = V 2 V 2 = 0.8P PV, where PV = 0.8 V and V = 1.25V
Gas volume consequently increases by 25%.
The temperature of a system is constant during an isothermal process, which is a thermodynamic process. Thermal equilibrium is preserved because heat is transferred into or out of the system so slowly.
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How many moles of H2(g) are generated by the complete reaction of 0.155 g of Mg(s) with excess HCl(aq)?
Mg (1 mole) + 2HCl (2 mole) → MgCl (1 mole) + H2 (1 mole)
Therefore, 1 mole of H2(g) are generated by the complete reaction of Mg(s) with excess HCl(aq).
What does the term "reaction" signify in the context of chemistry?
When atoms establish or break chemical bonds, chemical processes take place. Reactants are the substances that begin a chemical reaction, while products are the compounds that are created as a result of the reaction.
What in chemistry is a reactant?A component that is present at the outset of a chemical reaction is known as a reactant. Products are the substance(s) to the right of the arrow. A substance that remains after a chemical reaction is complete is known as a product.
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A 0.700L sample of gas at STP is compressed to a volume of 0.200L and the temperature is increased to 30 degrees Celcius . What is the new pressure of the gas (in atm)?
Answer: the pressure of the gas after the compression is 3.88 atm
Explanation:
The question requires us to calculate the new pressure of a gas, given its initial volume at STP, new volume after compression and temperature after compression.
The following information was provided by the question:
Initial volume = V1 = 0.700 L
Final volume = V2 = 0.200 L
Final temperature = T2 = 30 °C = 303.15 K
To solve this problem, we can apply the equation for ideal gases (shown below) considering the conditions after the compression:
\(P\times V=n\times R\times T\rightarrow P_2=\frac{R\times n\times T_2}{V_2}\)where R is the constant of gases (R = 0.082057 L.atm/K.mol), n is the number of moles of gas, T2 is the temperature after compression and V2 is the volume after compression.
Note that the number of moles of gas remains the same even after compression. Thus, we can calculate this number of moles considering the inital volume at STP, knowing that 1 mol of a gas at Standard Temperature and Pressure corresponds to 22.4 L of this gas:
22.4 L ------------------------- 1 mol
0.700 L ----------------------- x
Solving for x, we'll have:
\(x=\frac{(0.700L)\times(1mol)}{(22.4L)}=0.0312mol\)Therefore, the number of moles before and after compression is 0.0312 mol.
Now that we have the values for n, T2 and V2, we can calculate the pressure after compression (P2):
\(\begin{gathered} \begin{equation*} P_2=\frac{R\times n\times T_2}{V_2} \end{equation*} \\ P_2=\frac{(0.082057L.atm/K.mol)\times(0.0312mol)\times(30+273.15)K}{(0.200L)}=3.88atm \end{gathered}\)Therefore, the pressure of the gas after the compression is 3.88 atm.
20 mL of CH4 (g) is burned together with 80 mL of O₂ (g), measured under the same
conditions of temperature and pressure. At the end of the reaction:
CH4 (g) + 2 O₂ (g) → CO₂ (g) + 2 H₂O (g)
What is the percentage composition by volume of the gaseous mixture?
40% CH4.20% CO2.40% H₂O
33% CO2 , 66% H2O
40% O2, 20% CO₂, 40% H₂O
25% CH4,25% O₂, 25% CO2. 25% H₂O
25% CH4 50% O2,25% CO2
The correct answer is 25% CH4, 50% O2, 12.5% CO2, and 25% H2O by percentage composition.
What is the chemical equation and we assume what?According to the chemical equation, for every molecule of CH4 burned, we need two molecules of O2. So we can assume that we have 10 mL of CH4 and 40 mL of O2, which will react completely.
Using the ideal gas law, we can find the number of moles of each gas present:
n(CH4) = (0.020 L)(1.00 atm)/(0.0821 L atm/mol K)(298 K) = 0.000964 mol
n(O2) = (0.080 L)(1.00 atm)/(0.0821 L atm/mol K)(298 K) = 0.00386 mol
From the balanced equation, we see that the volume ratio of CH4 to CO2 to H2O is 1:1:2. Therefore:
n(CO2) = n(CH4) = 0.000964 mol
n(H2O) = 2n(CH4) = 0.00193 mol
The total number of moles in the mixture is:
n(total) = n(CH4) + n(O2) + n(CO2) + n(H2O) = 0.000964 + 0.00386 + 0.000964 + 0.00193 = 0.00772 mol
The percentage composition by volume of each gas is equal to the number of moles of the gas divided by the total number of moles, multiplied by 100%:
% CH4 = (0.000964 mol/0.00772 mol) x 100% = 12.5%
% O2 = (0.00386 mol/0.00772 mol) x 100% = 50%
% CO2 = (0.000964 mol/0.00772 mol) x 100% = 12.5%
% H2O = (0.00193 mol/0.00772 mol) x 100% = 25%
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Which best describes the relationship between population size, carrying capacity, and limiting factors?
O The size of a population usually stays high due to its carrying capacity and limiting factors.
The size of a population usually stays near its limiting factors due to carrying capacity.
The size of a population usually stays near its carrying capacity due to limiting factors. O
The size of a population usually stays low due to its carrying capacity and limiting factors.
The best description of the relationship between population size, carrying capacity, and limiting factors is: "The size of a population usually stays near its carrying capacity due to limiting factors."
Carrying capacity refers to the maximum number of individuals that a particular environment can sustainably support. It represents the limit to which a population can grow given the available resources, such as food, water, and habitat. Limiting factors, on the other hand, are the factors that restrict population growth by reducing birth rates, increasing death rates, or limiting access to resources.As a population approaches its carrying capacity, limiting factors come into play and regulate the population size. These limiting factors can include competition for resources, predation, disease, availability of suitable habitat, and other environmental factors. They act as checks on population growth, preventing it from exceeding the carrying capacity of the ecosystem.
Therefore, the size of a population usually stays near its carrying capacity because the limiting factors ensure that the population does not exceed the available resources and ecological limits of the environment. If the population surpasses the carrying capacity, the limiting factors will intensify, causing a decline in resources and an increase in mortality rates, which ultimately brings the population back towards the carrying capacity.It's important to note that the relationship between population size, carrying capacity, and limiting factors is dynamic and can vary depending on various ecological and environmental factors.
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HQ5.40
Homework Answered Due Today, 11:59 PM
The reaction 3H₂(g) + N₂(g) → 2NH3(g) has an enthalpy of reaction of -92.6 kJ/mol. If 1 g of hydrogen and 2 g of nitrogen are
reacted, how much heat is produced (kJ)?
The amount of heat energy produced when 1 g of hydrogen and 2 g of nitrogen are reacted, is -6.61 KJ
How do i determine the heat energy produced?First, we shall obtain the limiting reactant. Details below:
3H₂ + N₂ -> 2NH₃
Molar mass of N₂ = 28 g/molMass of N₂ from the balanced equation = 1 × 28 = 28 g Molar mass of H₂ = 2 g/molMass of H₂ from the balanced equation = 3 × 2 = 6 gFrom the balanced equation above,
28 g of N₂ reacted with 6 g of H₂
Therefore,
2 g of N₂ will react with = (2 × 6) / 28 = 0.43 g of H₂
We can see that only 0.43 g of H₂ is needed in the reaction.
Thus, the limiting reactant is N₂
Finally, we the amount of heat energy produced. Details below:
3H₂ + N₂ -> 2NH₃ ΔH = -92.6 KJ
Molar mass of N₂ = 28 g/molMass of N₂ from the balanced equation = 1 × 28 = 28 gFrom the balanced equation above,
When 28 grams of N₂ reacted, -92.6 KJ of heat energy were produced.
Therefore,
When 2 grams of N₂ will react to produce = (2 × -92.6) / 28 = -6.61 KJ
Thus the heat energy produced from the reaction is -6.61 KJ
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The electron configuration of chromium is written as: 152 252 2p 3s 3p6 451 3d5
Is this the expected configuration? Select the correct answer and reason from the options below.
This is the expected configuration.
Both 452 3d4 and 451 3d can
represent the configuration of the
outer orbitals.
This is the expected configuration.
The expected configuration for the
outer orbitals is: 451 3d5
This is not the expected configuration.
O The expected configuration for the
outer orbitals is: 452 4p4
This is not the expected configuration.
O The expected configuration for the
outer orbitals is: 452 3d4
Answer:
Option D
Explanation:
The expected configuration of configuration is
\(\\ \sf{:}\!\!\implies 1s^22s^22p^63s^23p^64s^23d^4\)
This is why because 4s orbital is filled first before 3d orbital .\(\sf {:}\!\!\!\rightarrowtail \)
When heated, calcium carbonate, CaCO3(s) , decomposes to calcium oxide, CaO(s) , and carbon dioxide, CO2 . Using relevant data from your book's appendices, calculate the heat evolved or consumed when 15.0 g of calcium carbonate are decomposed. answer: kJ
As per the standard data, the heat evolved during one mole of calcium carbonate decomposes is 177.8 KJ. Thus 15 g or 0.15 moles of calcium carbonate when decomposed will produce 26.67 KJ of heat.
What is reaction enthalpy?Reaction enthalpy of a substance is the heat evolved or absorbed during a reaction. Reaction enthalpy is negative for an exothermic reaction and positive for an endothermic reaction.
Molar mass of calcium carbonate = 100 g.
no.of moles in 15 g = 15 /100 = 0.15 moles.
One mole or 100 g of calcium carbonate decompose to evolve 177.8 KJ according to the scientific record.
Thus, heat evolved by the decomposition of 0.15 moles is 0.15 × 177.8 KJ = 26.67 KJ.
Hence, the heat evolved during the decomposition of 15 g of calcium carbonate is 26.67 KJ.
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Which accurately labels the lysosome?
Answer:
One of the organelles in eukaryotic cells that carry out digestion and waste removal.
Answer:
It's X
Explanation:
Arrange the following ionic compounds in order of decreasing amount of energy released in lattice formation: LiCl, CaS, GaN, and RbBr. Rank from greatest to least lattice energy. To rank items as equivalent, overlap them.
The decreasing order of lattice energy realesed is GaN>CaS>LICI>RbBr.
The lattice energy depends on the following two factors. They are product of charges of the compound and radius of the ions.
Higher the charge of ions, higher will be the lattice energy. Smaller the radius of ion, larger will be the lattice energy.
Consider the given compounds as follows: LiCl, CaS, GaN and RbBr
The charges of ions of given compounds are Li⁺, Cl⁻, Ca²⁺, S²⁻, Ga³⁺,N³, Rb⁺ and Br⁻. So, in the given compounds GaN has higher lattice energy. After GaN, CaS has higher lattice energy. Out of two compounds LiCl and RbBr, Li has less ionic well as ionic radius than Rb. Since in groups from top top to bottom atomic size increases as well as ionic radius.
Therefore, LiCl has higher lattice energy than RbBr.
Hence, the decreasing order of lattice energy realesed is GaN> CaS>LICI>RbBr
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Which substance has ionic bonds BaO?
BaO has ionic bonds because of electronegative difference.
Ionic bonds, also known as electrovalent bonds, are a type of linkage created in a chemical compound by the electrostatic attraction of ions with opposing charges. When the valence (outermost) electrons of one atom are permanently transferred to another atom, a bond of this kind is created. If an atom gains electrons, it becomes a negatively charged ion (cation), while if it loses them, it becomes a positively charged ion (cation) (anion). Following is a brief discussion of ionic bonds. To learn more, go to chemical bonding: the ionic bonding process.
Ionic or electrovalent compounds are produced by ionic bonding, and the compounds formed between nonmetals and alkali and alkaline-earth metals serve as the best examples of this type of compound. Actually, a polar covalent bond is the extreme form of an ionic bond.
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A cubic meter of air was sampled at 1.0 ATM and 40 C.
An ion chromatographic analysis of that sample found it to contain 12 micrograms of NO2.
How many ppb of NO2 is in the air?
The amount of nitrogen oxide in the air sample is determined as 7.01 ppb.
Amount of Nitrogen oxide in the air
The amount of Nitrogen oxide (NO2) in the air in parts per billion (ppb) is calculated as follows;
12 micrograms of NO2 = 12 μg = 12 x 10⁻⁶ g
PV = nRT
V = nRT/P
Where;
V is volume of NO2 gasn is number of moles of NO2 gasT is temperature = 40 C = 313 Kn = m/M
M = molar mass of NO2 = 46
n = 12 x 10⁻⁶/46
n = 2.73 x 10⁻⁷ mole
V = (2.73 x 10⁻⁷ x 0.082057 x 313)/(1)
V = 7.01 x 10⁻⁶ L
V = 7.01 x 10⁻⁹ m³
Amount of NO2 In parts per billion= (Volume of NO2)/(volume of air) x 10⁹
= (7.01 x 10⁻⁹)/(1) x 10⁹
= 7.01 ppb
Thus, the amount of nitrogen oxide in the air sample is determined as 7.01 ppb.
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A quantum of energy has an energy of 4.14 x 10-14 J. Find the frequency of this radiation. Show your work.
The frequency of this radiation of a quantum of energy 4.14 *10-14 J is calculated to be 2.58 *10-15 Hz.
The Photoelectric Effect occurs when electrons are released from a metal surface when light strikes it. It was once thought that the greater the intensity of incoming light, the greater its energy, independent of hue. The light was viewed and treated as a wave, however, the wave phenomenon could not explain light's photoelectric actions.
The Quantum, according to Max Planck, is the smallest unit of energy that is released or absorbed in the form of electromagnetic radiation. The energy released or absorbed is proportional to the frequency of the radiation. It may be expressed mathematically as:
E= hc/λ
or
E= hf ( because, f = c/λ)
where,
E= Energy of the particle
h= Planck's constant
c= speed of light
λ= wavelength of the particle
f = frequency of the radiation
Thus, E= hf
Given,
E = 4,14*10-14J
E= 1.71017356 * 10^20 eV
h= 6.626 *10-34 m2Kg/s
E=hf
f= E/h
f= (1.71017356 * 10^20 eV) / (6.626 *10-34 m2Kg/s)
f= C
Thus, the frequency of this radiation is 6.626 *10-34 m2Kg/s.
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Liquid X is known to have a lower viscosity and lower surface tension than Liquid Y Use these facts to predict the result of each experiment in the table below, if you can. experiment predicted outcome O mx will be greater than my O mx will be less than my O Ill y will be equal to my Wax-coated particles carefully put onto the surface of Liquid X or Liquid Y will stay on the surface, if the particles are small enough. The heaviest mass of particle x and my that will stay on each liquid's surface without sinking are measured. It's impossible to predict whether mx or my will be greater without more information. OFx will be greater than F)y 15.0 mL of Liquid X are poured into a beaker, and 15.0 mL of Liquid Y are poured FX will be less than Fr into an identical beaker. Stirrers in each beaker are connected to motors, and thewill be equal to P forces Fx and Fy needed to stir each liquid It's impossible to predict whether Fr or F will at a constant rate are measured. be greater without more information.
To solve this, we must know each and every concept related to surface tension and viscosity as well. Therefore, mx will be less than my at liquid air interface.
What is surface tension?The tendency to reduce surface area produced by the tension of a liquid's surface film as a result of the surface layer's particles being drawn to the liquid's bulk is called surface tension.
Surface tension is caused by a net inward force that makes the surface operate like an elastic membrane on which objects may float freely. This net inward force is caused by a stronger cohesion between liquid molecules than adhesion between liquid and air molecules.
There is less surface tension in liquid x. As a result, it is unable to contain as many wax particles on its surface as liquid Y can. The liquids will combine uniformly. It is possible to combine two liquids with viscosities that are either lower or greater than the initial liquids.
Therefore, mx will be less than my at liquid air interface.
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Which metal(s) can be oxidized with a Pb2+ solution but not with a Cd2+ solution? (Hint: The reactions are occurring under standard conditions.)
A. Cr
B. Ni
C. Zn
D. Sn
Answer:
B. Ni
D. Sn
Explanation:
Electrode Potential is the potential difference set up between an element and a solution of its ion. It is a measure of the tendency of an element to form ions.
The electrode potentials vary from one metal ion or metal system to another and the value depends on:
concentration of ions in the solution
the temperature at which the measurement is made , and
the overall energy change.
When two half-cells are joined together through a salt bridge, the e.m.f (electromotive force) of the cell formed is the algebraic difference between the two electrode potentials.
However, the set up in which chemical energy is converted to electrical energy is known as an Electrochemical cell. It consists of two half cells ;
an oxidation half-cell reaction
a reduction half cell reaction.
From the information given:
the standard reduction potential for each metal under standard conditions in the electrochemical series is as follows :
\(E^0 _{Pb} = -0.126 \ V\)
\(E^0 _{Cr} = - 0.74 \ V\)
\(E^0 _{Ni} =- 0.23 \ V\)
\(E^0 _{Zn} =- 0.76 \ V\)
\(E^0 _{Sn} = -0.13 \ V\)
\(E^0 _{Cd} = - 0.40 \ V\)
We will realize that Ni and Sn have reduction values in between Pb and Cd.
Thus , Ni can be oxidized by Pb2+ solution but not with a Cd2+ solution
The metal(s) that can be oxidized with a \(Pb^{2+}\) solution
B. Ni
D. Sn
What is Electrode potential?It is the potential contrast set up between a component and an answer of its particle. It is a proportion of the inclination of a component to shape particles. The cathode possibilities shift from one metal particle or metal framework to another and the worth relies upon:
Centralization of particles in the arrangement, the temperature at which the estimation is made , and the general energy change.
Whenever two half-cells are combined through a salt scaffold, the e.m.f (electromotive power) of the cell shaped is the mathematical contrast between the two terminal possibilities.
However, the set up in which chemical energy is converted to electrical energy is known as an Electrochemical cell. It consists of two half cells ;
an oxidation half-cell reaction and a reduction half cell reaction.
On seeing the values of electrode potential from electrochemical series we observe that Ni and Sn have reduction values in between Pb and Cd.
Thus , Ni and Sn can be oxidized by \(Pb^{2+}\) solution but not with a \(Cd^{2+}\)solution.
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Emi wants to see if she can melt a marshmallow in the sun. She plans to put the marshmallow in a container that will cause it to heat up quickly. In one or two sentences, describe what type of container and materials Emi should use.
Answer:
I think emi should put it in a metal container and put it in the direction of the sun cause this will help produce heat as the sun shines on the metal container
2) Make Flash cards elaborating following terms with example: i. Mole ii. Compounds iii. Molecular Mass iv. Types of Mixture v. Free Radical vi. Gram formula mass
(i) A mole is the amount of a substance containing 6.022 × 10²³ particles.
(ii) Compounds are formed by the chemical bonding of different elements.
(iii) Molecular mass is the sum of atomic masses in a molecule.
(iv) There are two types of mix homogeneous and heterogeneous mixtures.
(v) Free radicals are highly reactive species with unpaired electrons.
(vi) Gram formula mass is the sum of atomic masses expressed in grams per mole.
(i) Mole: A mole is defined as the quantity of a substance that has an equal number of particles that are in 12 grams of carbon-12.
It is denoted by mol and is used in chemistry to measure quantities of atoms or molecules.
Example:1 mol of oxygen gas contains 6.022 × 10²³ oxygen molecules.
(ii) Compounds: Compounds are substances made up of two or more different elements that are chemically bonded together.
They can be broken down into simpler substances through chemical reactions.
Example:Water (H2O) is a compound made up of two hydrogen atoms and one oxygen atom that are chemically bonded together.
(iii) Molecular Mass: The molecular mass of a compound is the sum of the atomic masses of all the atoms in the molecule.
It is expressed in atomic mass units (amu) or grams per mole.
Example:The molecular mass of water (H2O) is 18.015 amu.
(iv) Types of Mixture: A mixture is a combination of two or more substances that are not chemically combined.
There are two types of mixtures - homogeneous and heterogeneous.
Example:A homogeneous mixture is a solution, such as saltwater, where the solute (salt) is evenly distributed in the solvent (water).
A heterogeneous mixture is a mixture that is not evenly distributed, such as oil and water.
(v) Free Radical: A free radical is an atom or molecule that has an unpaired electron in its outer shell and is highly reactive. They can be both harmful and helpful to the human body.
Example:A common free radical is the hydroxyl radical (OH·) that is formed by the body during metabolism.
(vi) Gram formula mass: The gram formula mass is the sum of the atomic masses of all the atoms in a compound.
It is expressed in grams per mole and is used to determine the mass of a certain number of molecules or atoms.
Example:The gram formula mass of water (H2O) is 18.015 g/mol.
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Explain how oxygen and carbon dioxide move with breathing.
Answer/Explanation:
With oxygen, it is what you breathe in so obviously, it is going to move around into your body. But with carbon dioxide, it is what you breathe out. When you breathe in, your body takes in the oxygen and the releases the carbon dioxide. Carbon dioxide is what plants actually consume, while they release oxygen.
I hope this helps!
-No one
g Calculate the energy of a photon that has a wavelength of 965 nm. 2.06x10-33 J 2.06x10-19 J 3.78x10-28 J 3.78x10-29 J None of these
Answer: The energy of a photon that has a wavelength of 965 nm is \(2.06\times 10^{-16}J\)
Explanation:
The relation between energy and wavelength of light is given by Planck's equation, which is:
\(E=\frac{hc}{\lambda}\)
where,
E = energy of the photon =
h = Planck's constant = \(6.626\times 10^{-34}Js\)
c = speed of light = \(3\times 10^8m/s\)
\(\lambda\) = wavelength of light = 965 nm = \(965\times 10^{-9}m\) \((1nm=10^{-9}m)\)
Putting in the values we get:
\(E=\frac{6.626\times 10^{-34}\times 3\times 10^8m/s}{965\times 10^{-9}m}=2.06\times 10^{-16}J\)
Thus the energy of a photon that has a wavelength of 965 nm is \(2.06\times 10^{-16}J\)
The solubility of the ionic compound MX3, having a molar mass of 288 g/mol, is 3.60 x 10-2 g/L. Calculate the KSP of the compound.
\(K_{sp}\) of the compound is found to be 5.04 ×\(10^{-10}\).
Solubility :Solubility can be define as the amount of a substance that dissolves or mixes in a given amount of solvent at specific conditions.
Solubility equilibrium
Ksp = \([A^{+} ]^{a}\) \([B^{-} ]^{b}\)
Ksp = solubility product constant
A+ = cation in an aquious solution
B- = anion in an aqueous solution
a, b = relative concentrations of a and b
Given,
Solubility = s = 3.60 × \(10^{-2}\) g/L
molar mass = 288 g/ mol
∴ s= 3.60 × \(10^{-2}\) g/L ÷ 288 g/ mol = 1.25 ×\(10^{-4}\) mol/ L
Reaction:
MX3 ⇄ M + 3X
s 3s
\(K_{sp}\) =[ \(M^{+3}\)] [ \(X^{-1}\)\(]^{3}\) = solubility product
∴ \(K_{sp}\) =\([s]^{} [3s]^{3}\)
∴ \(K_{sp}\) = 3 \(s^{4}\)
∴ \(K_{sp}\) = 3 × (3.60 × \(10^{-2}\) \()^{4}\)
∴ \(K_{sp}\) = 503.8848 ×\(10^{-8}\) = 5.04 ×\(10^{-10}\)
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AP CHEM answer and i will give brainliest, image attached
Answer:
what is this i dont know what kind of math this is
The liquid that condenses during distillation is called?
Answer:
the answer is distillate
Carbon-14 has a half-life of 5730 years. If an original sample was 100g of C¹4 and it is now 0.781g of C14, how old is your sample?
Answer:
40,113 years
Explanation:
To find the age of the sample, you need to use the half-life formula:
\(N(t)=N_0(\frac{1}{2})^{t/h\)
In this formula:
------> N(t) = current mass (g)
------> N₀ = initial mass (g)
------> t = time passed (yrs)
------> h = half-life (yrs)
You can plug the given values into the equation and rearrange the formula to find "t".
N(t) = 0.781 g t = ? yrs
N₀ = 100 g h = 5730 yrs
\(N(t)=N_0(\frac{1}{2})^{t/h\) <----- Half-life formula
\(0.781=100(\frac{1}{2})^{t/5730}\) <----- Insert values
\(0.00781=(\frac{1}{2})^{t/5730}\) <----- Divide both sides by 100
\(log_{1/2}(0.00781)=log_{1/2}((\frac{1}{2})^ {t/5730})\) <----- Take \(log_{1/2}\) of both sides
\(7.00 = \frac{t}{5730}\) <----- Solve \(log_{1/2}\)
\(40,113 = t\) <----- Multiply both sides by 5730
The given sample is 40,113 years .
What do you mean by half-life ?Half-life, in radioactivity, is the interval of time required for one-half of the atomic nuclei of a radioactive sample to decay.
Half-life formula,
\(\rm N(t)\;=N_0(\dfrac{1}{2})^\frac{t}{t1/2}\) .......(1)
where,
N(t)=current mass
N₀=initial mass
t=time period
h=half -life
Given,
N(t)=0.781g, t=? yrs, N₀=100g, h=5730 years
\(\rm N(t)\;=N_0(\dfrac{1}{2})^\frac{t}{t1/2}\)
put the values, in ......(1)
0.781=100(1/2) \(t/5730\\\)
log₁/₂(0.00781)=log₁/₂ ( 1/2)\(t/5730\)
7=t/5730
40,113=t
Hence, the given sample is 40,113 years .
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washing soda is a hydrate of sodium carbonate. a 2.714of washing soda is heated until a constant mass of 1.006g of NaNO3 is reached. what is the mass of water evaporated. what is the percent of water in the compound
37.06 percent is the percent of water in the compound
What is Washing Soda ?
Washing soda, also known as sodium carbonate, is a white crystalline powder that is commonly used as a cleaning and laundry aid. It is a strong alkaline substance and has a high pH, making it an effective cleaning agent for removing dirt, grease, and stains. Washing soda is often used as a household cleaner for tasks such as removing grease from ovens and pots and pans, cleaning tile and grout, and unclogging drains. In laundry, it can be used to remove stubborn stains, brighten clothes, and soften hard water. Washing soda can also be used in industrial applications, such as in the manufacture of glass, paper, and soap. It is a water-soluble compound and is generally considered safe for use, although it should be handled with care and not ingested, as it is a strong alkali and can be harmful if ingested in large quantities.
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Fatty acids and glycerol are the subunits of the energy storage molecules called
Answer:
true fats; triglycerides
Explanation:
What is N for silicon tetrachloride, SiCl4?
Correctly write the chemical formula for as many ions and compounds as you can:
1. Copper (11) ion
2. Bromide ion
3. Magnesium ion
4. Phosphide ion
5. Copper (11) Bromide
6. Sulfur Dichloride
7. Barium Fluoride
8. Magnesium Phosphate
9. Lithium Permanganate
10. Strontium Sulfite
11. Nitrogen Monoxide
12. Diselenium Tetraoxide
13. Aluminum Sulfide
14. Tin (IV) lodide
15. Beryllium Oxide
16. Potassium Hydroxide
The chemical formulas for the ions and compounds you listed:
Copper (II) ion: Cu²⁺
Bromide ion: Br⁻
Magnesium ion: Mg²⁺
Phosphide ion: P³⁻
Copper (I) Bromide: CuBr
Sulfur Dichloride: SCl₂
Barium Fluoride: BaF₂
Magnesium Phosphate: Mg₃(PO₄)₂
Lithium Permanganate: LiMnO₄
Strontium Sulfite: SrSO₃
Nitrogen Monoxide: NO
Diselenium Tetraoxide: Se₂O₄
Aluminum Sulfide: Al₂S₃
Tin (IV) Iodide: SnI₄
Beryllium Oxide: BeO
Potassium Hydroxide: KOH
Copper (II) ion: Cu²⁺
Copper (II) ion has a charge of 2+ and is represented by Cu²⁺. This means that copper has lost two electrons, resulting in a 2+ charge.
Bromide ion: Br⁻
The bromide ion has a charge of 1- and is represented by Br⁻. This means that bromine has gained one electron, resulting in a 1- charge.
Magnesium ion: Mg²⁺
The magnesium ion has a charge of 2+ and is represented by Mg²⁺. This means that magnesium has lost two electrons, resulting in a 2+ charge.
Phosphide ion: P³⁻
The phosphide ion has a charge of 3- and is represented by P³⁻. This means that phosphorus has gained three electrons, resulting in a 3- charge.
Copper (I) Bromide: CuBr
Copper (I) bromide is a compound formed by combining copper (I) ion (Cu⁺) and bromide ion (Br⁻). The charges of the ions balance each other, resulting in a neutral compound.
Sulfur Dichloride: SCl₂
Sulfur dichloride is a compound consisting of one sulfur atom (S) and two chlorine atoms (Cl). The subscript "2" indicates the presence of two chlorine atoms.
Barium Fluoride: BaF₂
Barium fluoride is a compound composed of one barium ion (Ba²⁺) and two fluoride ions (F⁻). The charges of the ions balance each other, resulting in a neutral compound.
Magnesium Phosphate: Mg₃(PO₄)₂
Magnesium phosphate is a compound consisting of one magnesium ion (Mg²⁺) and two phosphate ions (PO₄³⁻). The charges of the ions balance each other, resulting in a neutral compound. The subscript "3" indicates the presence of three magnesium ions, and the subscript "2" indicates the presence of two phosphate ions.
Lithium Permanganate: LiMnO₄
Lithium permanganate is a compound composed of one lithium ion (Li⁺) and one permanganate ion (MnO₄⁻). The charges of the ions balance each other, resulting in a neutral compound.
Strontium Sulfite: SrSO₃
Strontium sulfite is a compound consisting of one strontium ion (Sr²⁺) and one sulfite ion (SO₃²⁻). The charges of the ions balance each other, resulting in a neutral compound.
Nitrogen Monoxide: NO
Nitrogen monoxide is a compound composed of one nitrogen atom (N) and one oxygen atom (O). Since the compound does not contain ions, it is represented by its elemental symbols.
Diselenium Tetraoxide: Se₂O₄
Diselenium tetraoxide is a compound consisting of two selenium atoms (Se) and four oxygen atoms (O). The prefix "di-" indicates the presence of two selenium atoms.
Aluminum Sulfide: Al₂S₃
Aluminum sulfide is a compound composed of two aluminum ions (Al³⁺) and three sulfide ions (S²⁻). The charges of the ions balance each other, resulting in a neutral compound. The subscript "
2" indicates the presence of two aluminum ions, and the subscript "3" indicates the presence of three sulfide ions.
Tin (IV) Iodide: SnI₄
Tin (IV) iodide is a compound formed by combining tin (IV) ion (Sn⁴⁺) and iodide ion (I⁻). The charges of the ions balance each other, resulting in a neutral compound.
Beryllium Oxide: BeO
Beryllium oxide is a compound composed of one beryllium ion (Be²⁺) and one oxygen ion (O²⁻). The charges of the ions balance each other, resulting in a neutral compound.
Potassium Hydroxide: KOH
Potassium hydroxide is a compound consisting of one potassium ion (K⁺) and one hydroxide ion (OH⁻). The charges of the ions balance each other, resulting in a neutral compound.
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What is the molarity (M) of a bleach solution containing 9.50 grams of bleach (NaOCI) in 2,000 ml of solution?
The molarity of the bleach solution is 0.0635 M.
How to calculate the molarity (M) of a solution ?First we need to know the number of moles of solute (in this case, NaOCI) and the volume of the solution in liters.
First, we need to convert the mass of NaOCI to moles using its molar mass:
molar mass of NaOCI = 23.0 g/mol (for Na) + 16.0 g/mol (for O) + 35.5 g/mol (for Cl) + 1.0 g/mol (for I) = 74.5 g/mol
moles of NaOCI = mass / molar mass = 9.50 g / 74.5 g/mol = 0.127 moles
Next, we need to convert the volume of the solution to liters:
volume = 2,000 ml = 2,000 / 1,000 L = 2.0 L
Now we can calculate the molarity of the solution:
Molarity (M) = moles of solute / volume of solution in liters
M = 0.127 moles / 2.0 L = 0.0635 M
Therefore, the molarity of the bleach solution is 0.0635 M.
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Climate change is primarily driven by(1 point)
Answer:
burning fossil fuels, like coal.
Explanation:
Generated greenhouse gases which trap heat in the Earth.
1 mole of ribose (C5H10O5(s)) has a greater entropy than 1 mole of sucrose (C12H22O11(s)) True or false
Answer:
False
Explanation:
Hello,
In this case, it is possible to substantiate that the statement is false, since the entropy of sucrose is greater than the entropy of ribose due to the fact that molar mass of the sucrose (342 g/mol) is greater than the molar mass of ribose (150 g/mol) and the general rule states that the greater the molar mass the greater the entropy.
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