Answer:
Explanation: In a chemical formula, the symbols for each element in the compound are followed by subscripts that tell us how many of that element are in the compound. The subscripts that follow each element's symbol indicate how many of that element are in the compound. Notice how H is located in more than one place.
Explanation:
24. What is the difference between a Polyatomic Ion and a Compound?
The difference between polyatomic ions and a compound is that polyatomic ions have positive or negative charge, while compounds have no net electrical charge.
An electron is a positively charged particle inside of an atom, just like the proton.
True
False
Answer:
no it's is false because an electron have negative charges and it is not inside the atom and it is found out side the nucleus
0. 222g of a divalent metal is deposited when a current of 0. 45A is passed through a solution of it's salt for 25minutes. Calculate the relative atomic mass of the metal.
To calculate the relative atomic mass of the divalent metal, we can use Faraday's laws of electrolysis. Given the mass of the metal deposited (0.222g), current (0.45A), and time (25 minutes), we can determine the number of moles of the metal. First, convert 25 minutes to seconds, determine the number of moles of electrons involved, calculate the total charge passed through the solution. Finally, calculate the relative atomic mass of the metal: Atomic mass = mass / moles = 0.222g / 0.0035 moles ≈ 63.4g/mol.
To calculate the relative atomic mass of the divalent metal, we need to use the formula:
Relative atomic mass = (mass deposited/charge passed) x atomic mass
From the given information, we know that 0.222g of the divalent metal is deposited when a current of 0.45A is passed through the solution for 25 minutes.
To convert the time to seconds, we multiply 25 minutes by 60 seconds/minute, which gives us 1500 seconds.
Now, we can calculate the charge passed using the formula:
Charge passed = current x time
Charge passed = 0.45A x 1500s
Charge passed = 675C
Substituting the values into the formula, we get:
Relative atomic mass = (0.222g/675C) x atomic mass
Solving for the atomic mass, we get:
Atomic mass = (0.222g/675C) x 100 word
Atomic mass = 33 g/mol
Therefore, the relative atomic mass of the divalent metal is 33 g/mol.
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In clinical applications, the unit parts per million (ppm) is used to express very small concentrations of solute, where 1 ppm is equivalent to 1 mg of solute per 1 L of solution. Calculate the concentration in parts per million for each of the solutions.There is 43 μg of calcium in a total volume of 87 mL .concentration of calcium: _________ppm There is 0.91 mg of caffeine in a total volume of 105 mL .concentration of caffeine: _________ppm There is 0.47 mg of trace particles in a total volume of 95 dL .concentration of trace particles: ___________
Answer & Procedure
To solve this problem you will need to transform all the concentrations to the equivalence of ppm, which is 1 mg of solute per 1 L of solution.
Calcium: There are 43 μg of calcium in a total volume of 87 mL.
\(\frac{43\mu g}{87\text{ mL}}\frac{1\text{ mg}}{1000\text{ }\mu g}\frac{1000\text{ mL}}{1\text{ L}}=0.49\frac{mg}{L}=0.49\text{ ppm}\)Caffeine: There is 0.91 mg of caffeine in a total volume of 105 mL.
\(\frac{0.91\text{ mg}}{105\text{ mL}}\frac{1000\text{ mL}}{1\text{ L}}=8.67\frac{mg}{L}=\text{ 8.67 ppm}\)Trace particles: There is 0.47 mg of trace particles in a total volume of 95 dL.
\(\frac{0.47\text{ mg}}{95\text{ dL}}\frac{10\text{ dL}}{1\text{ L}}=0.049\frac{mg}{L}=0.049\text{ ppm}\)Adam is doing a science project. He wants to find out how the height of the Sun affects the length of shadows. He will measure the shadow of his house at different times. He will see when the shadow is the longest.
Which is a scientific prediction Adam could make about his project?
A.
The Sun is highest at noon.
B.
The shadow will be longest in the morning.
C.
My shadow is shorter than the shadow of my house.
D.
I found out that the shadow is shortest at noon.
Answer:
d I think there's two answer
Explanation:
or c
A student is working hard on a chemistry lab experiment that uses a strong acid. Halfway through the lab, the student gets hungry and starts eating a bag of chips. When the student licks their fingers, they start to have a severe reaction. summary
At home, your parents replace your house lights with lower-watt bulbs. Is this energy conservation or energy sustainability? Explain
This is actually electricity
The replacing of house lights with lower-watt bulbs represents energy conservation not energy sustainability because energy conservation is the efficient use of energy without wasting it.
What is energy conservation?Energy conservations refer to the practice of using less energy for doing various activities. Turning off the light when you leave the room is the example of energy conservation.
So we can conclude that replacing of house lights with lower-watt bulbs represents energy conservation not energy sustainability because energy conservation is the efficient use of energy without wasting it.
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if the liquid level inside the eudiometer was 22.06 cm higher than the liquid level in the beaker, what is the pressure associated with this liquid level difference in mm hg to four sig figs?
This liquid level differential corresponds to a pressure of 16.220 mmHg s, or four sig figs. when the liquid level inside the eudiometer was 22.06 cm greater than the liquid level in the beaker
The force perpendicularly applied to an object's surface divided by the area over which it is dispersed is known as pressure. The gauge pressure, also known as gauge pressure, is the pressure in relation to the surrounding air pressure.
A liquid level sensor is an instrument for measuring the height of a liquid and converting it to an electrical signal which is sent to other instrumentation to display, monitor, log or control the liquid level.
Height = 22.06 cm
1 mm Mg = 13. 60 mm.
= 22.06 cm x (10 mm*1cm)
= 220.6 mm X (1 mm Hg *13. 60 mm)
= 220.6 mm/ 13.60mm
=16.220 mmHq
= 16.220 mmHg
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Which solid does not react with a small amount of 3 M HNO 3 ? (A) calcium carbonate (B) manganese(II) sulfide (C) potassium sulfite (D) silver chloride
The solid does not react with a small amount of 3 M HNO3 is (D) silver chloride.
Your answer: (D) silver chloride does not react with a small amount of 3 M HNO3. This is because silver chloride is relatively insoluble in nitric acid, unlike the other solids which will react to form various products.
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The solid that does not react with a small amount of 3 M HNO₃ is silver chloride (AgCl). The correct option is (D).
Silver chloride is an insoluble ionic compound, which means it does not dissolve well in water or other common solvents. When HNO₃ (nitric acid) comes into contact with the other solids, chemical reactions occur.
(A) Calcium carbonate (CaCO₃) reacts with HNO₃, producing calcium nitrate (Ca(NO₃)₂), carbon dioxide (CO₂), and water (H₂O). This reaction is due to the acidic nature of HNO₃, which can cause the release of CO₂ from CaCO₃.
(B) Manganese(II) sulfide (MnS) reacts with HNO₃, producing manganese(II) nitrate (Mn(NO₃)₂), hydrogen sulfide (H₂S), and water (H₂O). In this case, the acid reacts with the sulfide, forming hydrogen sulfide gas as a product.
(C) Potassium sulfite (K₂SO₃) also reacts with HNO₃, resulting in the formation of potassium nitrate (KNO₃) and sulfuric acid (H₂SO₄). The acid reacts with the sulfite, creating a sulfate compound and a nitrate salt.
In conclusion, silver chloride (D) does not react with a small amount of 3 M HNO₃, while the other solids undergo chemical reactions when exposed to the acid. This is due to AgCl's insoluble nature and its inability to form new compounds under these conditions.
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What is carrying capacity?
Define population.
What environmental problems are
associated with human population
growth?
What events influenced human
population growth?
Answer:
1) Carrying capacity is the maximum number of individuals of a species that an environment can support.
2) Population - all the inhabitants of a particular town, area, or country.
3) An increase in population will inevitably create pressures leading to more deforestation, decreased biodiversity, and spikes in pollution and emissions, which will exacerbate climate change.
4) The three leading causes of population growth are births, deaths, and migration. Births and deaths are seen as natural causes of population change.
what is the order of: chlorine, oxygen, and carbon from greatest to least according to ionic radius?
Answer:
Oxgyen
Explanation:
Ok semoga membantu kamu bro
jadikan jawabban tercerdasa ya
I need some help with with question:
How could you prepare 100 ml of a 0.40 mol/L of MgSO4 solution from a stock solution of 2.0 mol/L MgSO4. And then how would u prepare it?
Answer:
C1V1=C2V2
C1 is 2.0mol/l
V1=?
C2=.4mol/L
V2=100ml or for this 0.1L
V1 is 20ml
Best way to prepare this is to measure out 20ml of the 2 molar solution and add 80mL to it to get to 100mL
Explanation:
please help!
Sally has 96.0 grams of Carbon that she heats from 350C to 2650C and it absorbs 955 Joules of heat in the process. She wants to know the heat capacity of the carbon.
- Show the calculation
- Show all work on the calculation- make sure to show all labels.
The heat capacity of the carbon is 0.00371 Joules/gram Kelvin.
The equation for calculating heat absorbed is: q = mcΔT
where:
q = heat absorbed (Joules)
m = mass (grams)
c = specific heat capacity (Joules/gram °C)
ΔT = change in temperature (°C)
We can rearrange the equation to solve for c: c = q/mΔT
Substituting the given values: m = 96.0 g
ΔT = (2650 - 350)°C = 2300°C
q = 955 J
First, we need to convert the temperature change from Celsius to Kelvin since the unit for specific heat is in Joules/gram Kelvin.
ΔT = 2300 + 273.15 = 2573.15 K
Plugging in the values:
c = 955 J / (96.0 g x 2573.15 K)
c = 0.00371 J/g K
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what does the data mean for people involved in farming and agriculture?
Answer:
ummmmmmmmmmmmmmmm
Explanation:
Answer: well im taking the test right now. and i dont know so yah. good luck HAH
Explanation:
What period has the highest ionization energy?
Answer:helium or the noble gases
Explanation: The ionization energy decreases from top to bottom in groups, and increases from left to right across a period. Thus, helium has the largest ionizing energy
Warm air rises at the equator and cold air sinks at the poles creating
Responses
A hurricanes.hurricanes.
B convection currents.convection currents.
C the Coriolis effect.the Coriolis effect.
D tornadoes.
Warm air rises at the equator and cold air sinks at the poles creating is B convection currents.
What is convection currents?Convection can be described as the single or multiphase fluid flow which can take place spontaneously as a result of the combined effects of material property heterogeneity as well as the body forces on a fluid, especially with density and gravity.
It should be noted that in case whereby Warm air rises at the equator and cold, there will be a phenonmenon in which the air sinks at the poles which will bring about the convection currents.
Therefore, option B is correct.
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For the titration of 10 mL of 0.15 M acetic acid with 0.1 M sodium hydroxide, determine the pH when 15 mL of base has been added?
The pH of the solution after adding 15 mL of 0.1 M sodium hydroxide is 4.16.
The titration of acetic acid (CH3COOH) with sodium hydroxide (NaOH) can be represented by the balanced chemical equation:
CH3COOH + NaOH → CH3COONa + H2O
In this reaction, one mole of acetic acid reacts with one mole of sodium hydroxide to produce one mole of sodium acetate (CH3COONa) and one mole of water.
Before any base is added, the solution consists of 10 mL of 0.15 M acetic acid. At this point, the concentration of acetic acid can be calculated using the formula:
M1V1 = M2V2
where M1 is the initial concentration of the acid, V1 is the initial volume of the acid, M2 is the final concentration of the acid after adding the base, and V2 is the final volume of the solution after adding the base. Substituting the given values:
(0.15 M) × (10 mL) = M2 × (25 mL)
M2 = 0.06 M
When 15 mL of 0.1 M sodium hydroxide is added to the solution, it reacts with the acetic acid according to the balanced chemical equation. The amount of sodium hydroxide added is not enough to completely neutralize all of the acetic acid, so a buffer solution is formed consisting of sodium acetate and acetic acid. The moles of acetic acid remaining after the addition of the base can be calculated using the formula:
moles of acetic acid = initial moles - moles of NaOH added
The initial moles of acetic acid can be calculated from the initial concentration and volume:
moles of CH3COOH = (0.15 M) × (10 mL) = 0.0015 moles
The moles of NaOH added can be calculated from the concentration and volume:
moles of NaOH = (0.1 M) × (15 mL / 1000 mL/mL) = 0.0015 moles
Therefore, the moles of acetic acid remaining are:
moles of CH3COOH = 0.0015 moles - 0.0015 moles = 0 moles
The concentration of the acetate ion (CH3COO-) can be calculated using the formula:
M = moles / volume
The volume of the solution after adding the base is 25 mL. The moles of acetate ion can be calculated from the moles of sodium hydroxide that reacted with the acetic acid:
moles of CH3COO- = moles of NaOH added = 0.0015 moles
The concentration of the acetate ion is then:
M = 0.0015 moles / (25 mL / 1000 mL/mL) = 0.06 M
We can use the Henderson-Hasselbalch equation to calculate the pH of the buffer solution:
pH = pKa + log([A^-]/[HA])
where pKa is the acid dissociation constant of acetic acid (4.76), [A^-] is the concentration of the acetate ion, and [HA] is the concentration of the acetic acid.
Substituting the given values:
pH = 4.76 + log(0.06 M / 0.15 M) = 4.76 - 0.6 = 4.16
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List all possible values of the angular momentum quantum number l for an electron in the L(n=2) shell of an atom.
In quantum mechanics, the angular momentum quantum number "l" defines the shape of the atomic orbital. The l value is an integer ranging from 0 to (n-1) where n is the principal quantum number.
Therefore, for an electron in the L(n=2) shell of an atom, the possible values of the angular momentum quantum number l would range from 0 to 1, since n=2.
This is because the L shell is the second shell, which has n=2. Therefore, it can have subshells with l=0 and l=1, also known as the s and p subshells respectively.
The angular momentum quantum number also has an effect on the energy of the electron, with higher l values having higher energy.
Thus, the possible values of the angular momentum quantum number l for an electron in the L(n=2) shell of an atom are l=0 and l=1.
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Alright, now you actually have an aqueous solution of your salt! Though perhaps not all of the salt has dissolved yet, but we'll get to that. How sure would you say you are about the concentration at this point?
a) What I've prepared is not yet an aqueous solution
b) It's not that accurate, but similar to what we need in the end
c) It's quite accurate
d) It's really inaccurate
If not all of the salt has dissolved then the measurement of the concentration at the time is really inaccurate.
What is concentration?The concentration is the amount of substance that is present in solution. We know that we can not measure the concentration unless all of the solute have been dissolved in the solution.
Thus, if not all of the salt has dissolved then the measurement of the concentration at the time is really inaccurate.
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Why does air with higher amounts of water vapor have a lighter density?
Answer:
moist air is less dense than dry air because water has a lower molecular weight than nitrogen and oxygen
Answer:
Water vapor is a relatively light gas when compared to diatomic Oxygen and diatomic Nitrogen. Thus, when water vapor increases, the amount of Oxygen and Nitrogen decrease per unit volume and thus density decreases because mass is decreasing.
what atoms on what molecules act the nucleophile and the electrophile in the reaction between the alcohol and chromic acid?
The reaction between an alcohol and chromic acid (H2CrO4) involves the oxidation of the alcohol to a carbonyl compound. During this reaction, the chromium in chromic acid is reduced from a +6 oxidation state to a +3 oxidation state.
What does the reaction mechanism involves?Protonation: The chromic acid donates a proton to the alcohol, forming a chromate ester and water. This step generates a good leaving group, i.e. the water molecule. R-OH + H2CrO4 → R-O-CrO3 + H2O. Nucleophilic attack: The oxygen atom in the chromate ester acts as a nucleophile, attacking the electrophilic carbon atom in the carbonyl group. The result is the formation of a tetrahedral intermediate. R-O-CrO3 + H2O → R-O-Cr(OH)3. Elimination: The tetrahedral intermediate undergoes elimination of a water molecule, leading to the formation of the carbonyl compound and the regeneration of the chromic acid. R-O-Cr(OH)3 → R=O + Cr(OH)3
What are an example of a nucleophile?A reactant known as a nucleophile provides an electron pair in order to create a covalent bond. Typically, a nucleophile has a negative charge or is neutral with one or two donateable electrons. Such examples include H2O, -OMe, or -OtBu. The species with a lot of electrons is a nucleophile overall.
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Since the speed of light, “c”, is 0.3% slower in air than it is in outer space, how does that affect the observed wavelengths?
Answer:
....interesting
Think of the different types of reactions you have learned about. How can you tell if they absorb energy or release energy, and at the molecular level, how are they different?
Answer:
Absorbed will be harder to spot than releasing because take this as it's like a tire. A tire will go smaller when it has no air compared to when it has air. But absorbed it the opposite. It gets bigger with more air and etc.
Explanation:
My answer don't copy and paste change it a little.
ChemBonding9. In ammonium chloride NH4Cl, the bonding between NH4+ and chloride ion Cl− is _______.
options:
ionic
polar covalent
nonpolar covalent
what does it mean to say that momentum is conserved
It means that in any interaction where external impulses don't occur, the momentum of the system remains the same before and after the interaction. When a cannonball is fired, its momentum does change.
the term _______________ is derived from the fact that most compounds of this chemical class are synthesized from the combination of carbon and water.
Since the majority of the molecules in this chemical class are created by combining carbon and water, the term "carbohydrate" derives from this.
Which type of microorganism has its own domain?Only the domain Eukarya contains multicellular, visible organisms like humans, animals, plants, and trees. Many microorganisms, including fungi, algae, and micro-animals, inhabit this region as well. Viruses are nonliving agents, hence they are excluded from the major categories of microorganisms. Single-celled or multicellular eukaryotic creatures are both possible.
There are three domains: Archaea, Bacteria, and Eukarya. Prokaryotic organisms fall under the domains Archaea or Bacteria, while eukaryotic organisms fall under the category Eukarya. Archaea. In terms of size and structure, archaea resemble bacteria but have a greater range of cell forms.A domain, also known as a dominion, superkingdom, realm, or empire, is the highest taxonomic rank that may be assigned to an entire group of organisms in biological taxonomy.
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Which of the following represents the number of Molecules of the type indicated is present as a reactant or product of the chemical reaction shown?
Following represents the number of Molecules of the type indicated is present as a reactant or product of the chemical reaction shown is the coefficient of the species
The number of atoms, molecules, or formula units of a reactant or product in a balanced chemical equation is the coefficient of that species then the mole ratio of two substances in a chemical reaction is the ratio of their coefficients in the balanced chemical equation and the this numbers are called as coefficient and they tell how many of each molecule are participate in the reaction
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What do you do if your friends hate you ex that you secretly dating again and you promised not to date him again but you i love him?
Answer:
this is what I personally feel.
Explanation:
it depends on ex . If he is a a hole ,not trustworthy, or is a negitive person,Then yeah i understand what they are coming from. Another is that is also on your end. if you keep going back to a person that is on you . if he isnt treating you right, then listen to them !! . Youll find someone that knows your worth :) . I hope this helped . have a nice day <3
0.1 mL of urine plated out on nutrient agar. After incubation at 37ºC, 279 colonies appeared. Give the CFU/mL. How many CFU are there per 100 mL?
To calculate the colony-forming units per milliliter (CFU/mL), you need to know the volume plated and the number of colonies counted.
In this case, you plated 0.1 mL of urine and observed 279 colonies after incubation.
CFU/mL can be calculated using the following formula:
CFU/mL = (Number of Colonies / Volume Plated) × Dilution Factor
Since you plated 0.1 mL of urine, the volume plated is 0.1 mL. The dilution factor is assumed to be 1 since no dilution was mentioned.
CFU/mL = (279 colonies / 0.1 mL) × 1
= 2790 CFU/mL
So, there are 2790 CFU/mL of urine.
To calculate the CFU per 100 mL, you can use the following formula:
CFU per 100 mL = CFU/mL × Volume
Since you want to calculate the CFU per 100 mL, the volume is 100 mL.
CFU per 100 mL = 2790 CFU/mL × 100 mL
= 279,000 CFU
Therefore, there are 279,000 CFU per 100 mL of urine.
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what is the formal charge of a sulfur atom that forms four bonds and has one lone pair?
The formal charge of the sulfur atom that forms four bonds and has one lone pair is 0.
The formal charge can be describes as the difference between the number of the valence electrons of an atom in the neutral free state and the number assigned to the atom .
The formal charge is expressed as :
Formal charge, FC = V - N - B / 2
Where,
The FC = formal charge
V = number of valence electrons
N = number of nonbonding valence electrons
B = total number of electrons shared in bonds
The formal charge of sulfur = 6 - 2 - 8 / 2
The formal charge of sulfur = 6 - 2 - 4
The formal charge of sulfur = 6 - 6
The formal charge of sulfur = 0
Thus, the formal charge on sulfur is zero.
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