Answer:
The answer is 5.
What is the direct democracy? Does it work well with a large or small population
Answer:
In a direct democracy, which is also called pure democracy the decisions are not taken by representatives. All decisions are voted on by the people. When a budget or law needs to be passed, then the idea goes to the people. Large governments rarely make decisions this way
Explanation:
I don't think direct democracy works well unless the population is homogenous and agree on major issues
A 0.563 M solution of the salt NaA has a pH of 11.56. Calculate the Ka value for the acid HA. Record your answer in scientific notation to 3 sig figs.
Answer:
\(\displaystyle K_a = 4.24\times 10^{-10}\)
Explanation:
Write the base reaction of NaA with water:
\(\displaystyle \text{A}^-_\text{(aq)}+\text{H$_2$O}_\text{($\ell$)}\rightleftharpoons \text{HA}_\text{(aq)} + \text{OH}^-_\text{(aq)}\)
Hence, the equilibrium constant expression for the reaction is:
\(\displaystyle K_b = \frac{[\text{OH}^-][\text{HA}]}{[\text{A}^-]}\)
Thus, to find Ka, we can find Kb and use the fact that Ka × Kb = Kw.
From the reaction and initial concentration of NaA, create an ICE chart:
\(\begin{tabular}{llllll} & A^- &\text{H$_2$O} & \rightleftharpoons & HA & OH^- \\I & 0.563 M & \---- & & 0 M & 0 M \\C & -\text{ $ x$} & \---- & & +\text{ $x$ M} & + \text{$x$ M} \\E & \text{(0.563 - $x$) M} & \---- & & \text{$x$ M} & \text{$x$ M} \end{tabular}\)
Find [OH⁻] from the given pH:
\(\displaystyle \begin{aligned} \text{pH} +\text{pOH} & = 14.00 \\ \\ \text{pOH} & = 14.00 - \text{pH} \\ \\ & = 14.00 - (11.56) \\ \\ & = 2.44 \\ \\ -\log[\text{OH}^-] & = 2.44 \\ \\ [\text{OH}^-] &= 10^{-2.44} \\ \\ & =0.00363 \text{ M}= 3.63\times 10^{-3} \text{ M} = x\text{ M}\end{aligned}\)
Solve for all species concentrations at equilibrium from the found x value:
\(\displaystyle [\text{HA}] = [\text{OH}^-] = 3.63\times 10^{-3} \text{ M}\)
And:
\(\displaystyle \begin{aligned} \ [\text{A}^-] & = 0.563 - 3.63\times 10^{-3} \text{ M}\\ \\ & = 0.559\text{ M}\end{aligned}\)
Find Kb:
\(\displaystyle \begin{aligned} \displaystyle K_b &= \frac{[\text{OH}^-][\text{HA}]}{[\text{A}^-]} \\ \\ & = \frac{(3.63\times 10^{-3})(3.63\times 10^{-3})}{(0.559)}\\ \\ & = 2.36\times 10^{-5}\end{aligned}\)
Find Ka:
\(\displaystyle \begin{aligned} K_a\cdot K_b & = K_w \\ \\ K_a & = \frac{K_w}{K_b} \\ \\ & = \frac{(1.00 \times 10^{-14})}{(2.36\times 10^{-5})} \\ \\ &= 4.24\times 10^{-10} \end{aligned}\)
In conclusion:
\(\displaystyle K_a = 4.24\times 10^{-10}\)
what’s is the answer?
The energy of the photon of light can be obtained as 6.27 * 10^-20 J.
What is the energy of the photon?We know that a photon has to to do with a particular unit of light. We know that light can be said to be composed of very tiny corpuscles and these corpuscles of light is what we call the photon of the light.
We can be able to us the equation that is derived by Max Plank to be able to get the value of the energy of the photon of light. Now we know that a photon of light can have an energy that is able to be obtained by;
E = hf
h = Plank's constant
f = Frequency
Then;
E = 6.6 * 10^-34 Js * 9.5 * 10^13 Hz
= 6.27 * 10^-20 J
Thus as we can see from the parameters in the question, the energy of the photon is 6.27 * 10^-20 J.
Learn more about energy of the photon:https://brainly.com/question/2393994
#SPJ1
Are metals or non-metals larger ion size compared to the size of the neutral atom?
it has to be one of them
PLZ HELP
Explanation:
Atoms of nonmetallic elements tend to form negative ions (anions) by gaining one or more electrons. ... From left to right across a period, the ionic size decreases as long as you are comparing all metals or all nonmetals. Between the metals and nonmetals, the ionic size increases as you switch from cations to anions
hope it helps you
Can anyone help me with chemistry final today
The mass is 72.3 grams which is found by adding the mass of the products (41.5 + 30.8 = 72.3).
What is mass?Mass is described as a fundamental concept in physics that defines the measure of a body's resistance to acceleration, or the amount of matter that an object contains. It is measured in standard SI units of kilograms (kg) or pounds (lb).
Mass is distinct from weight, which is the measure of the force of gravity acting on an object and not affected by gravity, whereas weight is.
Mass is an intrinsic property of an object, whereas weight is a force that changes depending on the location of the object, so it is only meaningful in a gravitational field.
This is in accordance with the law of conservation of mass, which stipulates that because matter is neither generated nor destroyed during a chemical reaction, the mass of the reactant and the mass of the products must be equal.
To learn more about mass at:
brainly.com/question/24191825
#SPJ1
The complete question is attached as an image
Fill in the missing information
Write balanced equation for these. Then solve the problem.
When 3.24 moles of magnesium chlorate decompose, how many grams of oxygen are produced?
When 78.5 moles of copper react with sulfur, how many grams of copper(I) sulfide are produced?
9.00 x 10^3 mols of hydrogen gas are produced when you drop how many grams of potassium in water?
When calcium phosphide is treated with 2.95 x 10^-6 moles of aluminum oxide, what is the mass of calcium oxide formed?
1) 155.52 g of oxygen of magnesium chlorate. 2) 6,246.41 g of copper(I) sulfide is produced from 78.5 moles of copper. 3) 175.95 kg of potassium produce 9.00 x \(10^3\) . 4) 1.49 x \(10^-4\)g of calcium oxide is formed from 2.95 x \(10^-6\) moles of aluminum oxide and calcium phosphide.
1. The balanced equation for the decomposition of magnesium chlorate is:
2Mg\((ClO_{3})\)2(s) → 2MgO(s) + \(3O_{2} (g)\) +\(2Cl_{2} (g)\)
From the equation, 2 moles of magnesium chlorate produce 3 moles of oxygen gas.
So, 3.24 moles of magnesium chlorate will produce (3/2) x 3.24 = 4.86 moles of oxygen.
The molar mass of oxygen is 32 g/mol.
Therefore, the mass of oxygen produced is:
4.86 moles x 32 g/mol = 155.52 g
2. The balanced equation for the reaction between copper and sulfur is:
2Cu(s) + S(s) → \(Cu_{2}S(s)\)
From the equation, 2 moles of copper react with 1 mole of sulfur to produce 1 mole of copper(I) sulfide.
So, 78.5 moles of copper will produce (1/2) x 78.5 = 39.25 moles of copper(I) sulfide.
The molar mass of copper(I) sulfide is 159.16 g/mol.
Therefore, the mass of copper(I) sulfide produced is:
39.25 moles x 159.16 g/mol = 6,246.41 g
3. The balanced equation for the reaction between potassium and water is:
2K(s) + 2\(H_{2}O\)(l) → 2KOH(aq) + \(H_{2}\)(g)
From the equation, 2 moles of potassium react with 2 moles of water to produce 1 mole of hydrogen gas.
So, 9.00 x \(10^3\) moles of hydrogen gas will be produced by the reaction of (1/2) x 9.00 x \(10^3\) = 4,500 moles of potassium.
The molar mass of potassium is 39.10 g/mol.
Therefore, the mass of potassium required is:
4,500 moles x 39.10 g/mol = 175,950 g or 175.95 kg
4. The balanced equation for the reaction between calcium phosphide and aluminum oxide is:
\(3Ca_{3}P_{2}\)(s) +\(10Al_{2}O_{3}(s)\) → 9CaO(s) + \(2Al_{2}S_{3}\)(s) + \(6P_{4}\)(g)
From the equation, 3 moles of calcium phosphide react with 10 moles of aluminum oxide to produce 9 moles of calcium oxide.
So, 2.95 x\(10^-6\) moles of aluminum oxide will produce (9/10) x 2.95 x \(10^-6\) = 2.655 x \(10^-6\) moles of calcium oxide.
The molar mass of calcium oxide is 56.08 g/mol.
Therefore, the mass of calcium oxide formed is:
2.655 x\(10^-6\) moles x 56.08 g/mol = 0.000149 g or 1.49 x \(10^-4 g\).
To learn more about balanced equation click on the given link brainly.com/question/11904811
#SPJ1
dissociation equation for CuCrO4
Answer:
Dissociation Equations Worksheet
Write balanced chemical equations to represent the slight dissociation or the
complete dissociation for 1 mole of the following compounds. In the case of slight
dissociation use a double arrow and for complete dissociation use a single arrow.
Include phase notation in the equations.
1) silver chloride
2) sodium acetate
3) ammonium sulfate
4) calcium carbonate
5) potassium carbonate
6) sodium hydroxide
7) silver chlorate
8) iron(II) sulfate
9) lead(II) phosphate
10) lead(II) chromate
11) iron(III) chloride
12) calcium nitrate
13) iron(III) oxide
14) copper(II) sulfate
15) mercury(II) sulfide
16) zinc chloride
17) lead(II) acetate
18) aluminum phosphate
Solutions
1) AgCl(s) ↔ Ag+
(aq) + Cl-
(aq)
2) NaC2H3O2(s) Æ Na+
(aq) + C2H3O2
-
(aq)
3) (NH4)2SO4(s) Æ 2NH4
+
(aq) + SO4
2-(aq)
4) CaCO3(s) ↔ Ca2+(aq) + CO3
2-(aq)
5) K2CO3(s) Æ 2K+
(aq) + CO3
2-(aq)
6) NaOH(s) Æ Na+
(aq) + OH-
(aq)
7) AgClO3(s) Æ Ag+
(aq) + ClO3
-
(aq)
8) FeSO4(s) Æ Fe2+(aq) + SO4
2-(aq)
9) Pb3(PO4)2(s) ↔ 3Pb2+(aq) + 2PO4
3-(aq)
10) PbCrO4(s) ↔ Pb2+(aq) + CrO4
2-(aq)
11) FeCl3(s) Æ Fe3+(aq) + 3Cl-
(aq)
12) Ca(NO3)2(s) Æ Ca2+(aq) + 2NO3
-
(aq)
13) Fe2O3(s) ↔ 2Fe3+(aq) + 3O2-(aq)
14) CuSO4(s) Æ Cu2+(aq) + SO4
2-(aq)
15) HgS(s) ↔ Hg2+(aq) + S2-(aq)
16) ZnCl2(s) Æ Zn2+(aq) + 2Cl-
(aq)
17) Pb(C2H3O2)2(s) Æ Pb2+(aq) + C2H3O2
-
(aq)
18) AlPO4(s) ↔ Al3+(aq) + PO4
3-(aq)
Explanation:
Compare and contrast the use of fossil fuels and wind energy. (1 point) Both fossil fuels and wind energy can be used to produce electricity. However, burning fossil fuels does not pollute the atmosphere, while using Earth's wind does. O Both fossil fuels and wind energy contribute negatively to climate change. However, mining for fossil fuels is much more damaging to the environment than using wind power. Both fossil fuels and wind energy can be used to produce electricity. However, wind energy does not pollute the atmosphere, while burning fossil fuels does. Both fossil fuels and wind energy contribute negatively to climate change. However, using Earth's wind for energy is much more damaging to the environment than using fossil fuels.
Answer:
The Answer will be provided below, please pay attention in class next time so that you don't have to be in a hurry like you are in now.
Explanation: The correct option is:
Both fossil fuels and wind energy can be used to produce electricity. However, burning fossil fuels does pollute the atmosphere, while using Earth's wind does not. Both fossil fuels and wind energy contribute to climate change, but the use of fossil fuels is much more damaging to the environment than the use of wind power.
Fossil fuels are non-renewable sources of energy that are formed over millions of years by the decomposition of organic matter. They release harmful greenhouse gases when burned, contributing to climate change. In contrast, wind energy is a renewable source of energy that uses turbines to harvest the power of wind. Wind energy does not produce any emissions, making it an environmentally friendly alternative to fossil fuels. While wind turbines can have some impacts on wildlife and habitats, the impact is much less severe than the effects of fossil fuel extraction and burning.
Added Part: Fossil fuels are non-renewable sources of energy that are derived from the remains of plants and animals that died millions of years ago. These sources include coal, oil, and natural gas. Wind energy, on the other hand, is a renewable source of energy that is generated by the kinetic energy of wind.
Here are some comparisons between fossil fuels and wind energy:
Environmental Impact: Fossil fuels have a significant negative impact on the environment. Burning fossil fuels produces greenhouse gases that contribute to climate change. The extraction of fossil fuels also has negative impacts on the air, water, and soil. Wind energy, however, has a very small environmental footprint. Wind turbines do not produce any emissions and do not require any water to generate electricity.
Energy Availability: Fossil fuels are abundant and have been the primary source of energy for decades. On the other hand, wind energy is a relatively new source of energy and the technology is still developing. However, the availability of wind energy is significant, as wind is a renewable source that is constantly available.
Sustainability: Fossil fuels are non-renewable, which means they will eventually run out. As the demand for energy continues to increase, the availability of fossil fuels will decrease. Wind energy is a renewable source of energy that will never run out.
Here are some pros and cons of both fossil fuels and wind energy:
Fossil Fuels:
Pros:
Reliable source of energy
High energy density
Large global infrastructure
Cons:
Non-renewable source of energy
Significant environmental impact
Price instability
Wind Energy:
Pros:
Renewable source of energy
Small environmental footprint
Low operating costs
Cons:
High initial costs for building wind turbines
Wind is an inconsistent source of energy
Can create noise pollution for surrounding communities
CuBr2 percent composition
The percent composition of CuBr₂ is approximately 28.46% of Cu and 71.54% of Br.
To determine the percent composition of CuBr₂ (copper(II) bromide), we need to calculate the mass of each element in the compound and then divide it by the molar mass of the entire compound.
The molar mass of CuBr₂ can be calculated by adding up the atomic masses of copper (Cu) and bromine (Br) in the compound. The atomic masses of Cu and Br are approximately 63.55 g/mol and 79.90 g/mol, respectively.
Molar mass of CuBr₂ = (63.55 g/mol) + 2(79.90 g/mol) = 223.35 g/mol
Now, let's calculate the percent composition of each element in CuBr₂:
Percent composition of copper (Cu):
Mass of Cu = (63.55 g/mol) / 223.35 g/mol × 100% ≈ 28.46%
Percent composition of bromine (Br):
Mass of Br = 2(79.90 g/mol) / 223.35 g/mol × 100% ≈ 71.54%
Therefore, the percent composition of CuBr₂ is approximately:
- Copper (Cu): 28.46%
- Bromine (Br): 71.54%
These values represent the relative mass percentages of copper and bromine in the compound CuBr₂.
for more such questions on composition
https://brainly.com/question/28250237
#SPJ8
Room temperature is about 20 degrees Celsius. Explain how you could convert this temperature to kelvin. Use evidence from the figure to support your answer.
Answer:
293.15 K.
Explanation:
It is given that, the room temperature is 20 degrees Celsius.
We need to convert this temperature into kelvin.
The conversion from degrees Celsius to Kelvin is as follows :
\(T_k=T_c+273.15\)
We have, \(T_c=20^{\circ} C\)
So,
\(T_k=20+273.15\\\\T_k=293.15\ K\)
So, the room temperature is 293.15 kelvin.
Which of the following releases hormones into your bloodstream?
A. Endocrine system
B. Sympathetic nervous system
C. Lobal system
a
D. Autonomic nervous system
Answer:
answer is A. Endocrine system
Endocrine glands secrete hormones straight into the bloodstream. Hormones help to control many body functions, such as growth, repair and reproduction.
Answer:
A endocrine system
this is the answer
An aqueous solution of 4mol/L nitric acid is electrolysed in an electrolytic cell using graphite electrodes, write the chemical symbol for all the ions in the electrolytic cell?
The main ions present in the electrolytic cell during the electrolysis of 4 mol/L nitric acid are H+, NO3-, OH-, and NO2. Additionally, water (H2O) is also present as the solvent.
Hydrogen ion (H+): When nitric acid dissolves in water, it ionizes to release hydrogen ions, which are positively charged. The chemical symbol for the hydrogen ion is H+.
Nitrate ion (NO3-): Nitric acid also dissociates to form nitrate ions. These ions have a negative charge, and their chemical symbol is NO3-.
Hydroxide ion (OH-): Water molecules can undergo self-ionization, producing hydroxide ions and hydrogen ions. In the presence of water, nitric acid can also lead to the formation of hydroxide ions, OH-.
Nitrogen dioxide (NO2): During the electrolysis process, some nitrate ions may be oxidized at the anode to form nitrogen dioxide gas. The chemical symbol for nitrogen dioxide is NO2.
Water (H2O): Water itself is present in the electrolytic cell. It serves as the solvent and also participates in ionization reactions.
For more such questions on ions visit;
https://brainly.com/question/1310794
#SPJ8
7) How many molecules of CO2 are in 2.5 L at STP?
By using the ideal gas law and Avogadro's number, we find that there are approximately 6.72 × 10^22 molecules of CO2 in 2.5 L at STP.
To determine the number of molecules of CO2 in 2.5 L at STP (Standard Temperature and Pressure), we can use the ideal gas law and Avogadro's number.
Avogadro's number (N_A) is a fundamental constant representing the number of particles (atoms, molecules, ions) in one mole of substance. Its value is approximately 6.022 × 10^23 particles/mol.
STP conditions are defined as a temperature of 273.15 K (0 °C) and a pressure of 1 atmosphere (1 atm).
First, we need to convert the volume from liters to moles of CO2. To do this, we use the ideal gas law equation:
PV = nRT,
where P is the pressure, V is the volume, n is the number of moles, R is the ideal gas constant, and T is the temperature in Kelvin.
Since we have STP conditions, we can substitute the values:
(1 atm) × (2.5 L) = n × (0.0821 L·atm/(mol·K)) × (273.15 K).
Simplifying the equation:
2.5 = n × 22.4149.
Solving for n (the number of moles):
n = 2.5 / 22.4149 ≈ 0.1116 moles.
Next, we can calculate the number of molecules using Avogadro's number:
Number of molecules = n × N_A.
Number of molecules = 0.1116 moles × (6.022 × 10^23 particles/mol).
Number of molecules ≈ 6.72 × 10^22 molecules.
Therefore, there are approximately 6.72 × 10^22 molecules of CO2 in 2.5 L at STP.
For more such questions on ideal gas law visit:
https://brainly.com/question/27870704
#SPJ8
In a double displacement reaction, Magnesium Phosphate reacts with Boron sulfide. if 5 moles of Magnesium Phosphate reacts, how many moles of Boron phosphate will be produced?
Question 7 options:
2.5 mol
5 mol
7.5 mol
10 mol
The amount of boron phosphate that would be generated is 10 moles.
What is the reaction's end result?We are aware that whenever the reactants and products are present, a reaction is considered to have taken place. As far as we are aware, the reactants are the elements that are mixed in the reaction's stoichiometry. To make 10 moles of magnesium phosphate, multiply 5 moles by 4 moles, 2 moles, and so on.
What is the purpose of the double displacement reaction?It is a type of chemical reaction in which two chemicals interact, switching places with their positive and negative ions to create two new products. Barium Sulphate and Sodium Chloride solution is created by combining Sodium Sulphate and Barium Chloride solutions.
To know more about double displacement reaction visit :-
https://brainly.com/question/29307794
#SPJ1
What is the name of Na
Select all that apply: Tonicity of a solution Check All That Apply is related to solute content.is related to solute content. is related to the pH of the solution.is related to the pH of the solution. gives information about potential changes in cell volume when cells are placed in that solution.gives information about potential changes in cell volume when cells are placed in that solution. is closely related to the temperature of the solution.is closely related to the temperature of the solution. is related to membrane permeability to solutes.
Answer:
.✓is related to the solute content
✓gives information about potential changes in cell volume when cells are placed in that solution
√is related to membrane permeability to solutes.
Explanation:
Tonicity of a solution can be explained as how an extracellular solution can give room for the liquid to move in and out of the cell through osmosis.
It should be noted that Tonicity of a solution is
.✓is related to the solute content
✓gives information about potential
changes in cell volume when cells are placed in that solution
√is related to membrane permeability to solutes.
4. The volume of a liquid sample is measured as 15.43 L. We need to know the volume in
mL.
3.
b.
What conversion factor would be used in the calculation?
Calculate the volume in mL.
Conversion factor used to convert volume is 1L = 1000 mL.
15.43L = 15430mL
The same attribute is expressed using a unit conversion but in a different unit of measurement. For instance, time can be expressed in minutes rather than hours, and distance can be expressed in kilometers, feet, or any other measurement unit instead of miles. Measurements are frequently offered in one set of units, like feet, but are required in another set, like chains. A conversion factor is a mathematical equation that facilitates an equal exchange of feet for chains.
A conversion factor is a number that is used to multiply or divide one set of units into another. If a conversion is required, it must be done using the correct conversion factor to get an identical value.
To learn more about the Conversion factors please visit-
https://brainly.com/question/28366871
#SPJ9
What is the mass of 6.02 x 1023 molecules of CO2?
ANSWER
EXPLANATION
Given that
The number o molecules is 6.02 x 10^23 molecules
Firstly, find the number of moles using the below formula
\(\text{ mole = }\frac{\text{ number of molecules}}{\text{ Avogadro's number}}\)Recall, that the Avogadro's number is 6.02 x 10^23
\(\begin{gathered} \text{ mole = }\frac{6.02\text{ }\times\text{ 10}^{22}}{6.02\text{ }\times\text{ 10}^{23}} \\ \text{ mole = 1} \end{gathered}\)Secondly, find the mass of CO2 using the formula below
\(\text{ mole = }\frac{mass}{\text{ molar mass}}\)Recall, that the molar mass of CO2 is given as 44.01 g/mol
\(\begin{gathered} \text{ mole = }\frac{\text{ mass}}{\text{ molar mass}} \\ \text{ mass = mole }\times\text{ molar mass} \\ \text{ mass = 1 }\times\text{ 44.01} \\ \text{ mass = 44.01 grams} \end{gathered}\)Therefore, the mass of CO2 is 44 grams
Which of the following would form a spontaneous reaction at 298 k
Only reactions B and C would be spontaneous at 298 K.
Spontaneous reactions are reactions that occur naturally and do not require external energy input to proceed. This can be determined by calculating the Gibbs free energy of the reaction at a given temperature and pressure. Gibbs free energy can be calculated using the equation ΔG = ΔH - TΔS, where ΔH is the enthalpy change of the reaction, ΔS is the entropy change of the reaction, T is the temperature in Kelvin, and ΔG is the change in free energy of the reaction.
A spontaneous reaction will have a negative ΔG, meaning that the reaction is exergonic and releases energy. Therefore, the products of the reaction are more stable than the reactants. If ΔG is positive, the reaction is endergonic and requires energy input to proceed.
In order to determine which of the following reactions would be spontaneous at 298 K, we must calculate the ΔG of each reaction and determine if it is positive or negative. The reactions are:
A. 2H2O(l) → 2H2(g) + O2(g) ΔH = 484 kJ/mol, ΔS = 69.9 J/K mol
B. CO2(g) + H2(g) → CO(g) + H2O(g) ΔH = 41 kJ/mol, ΔS = -102.6 J/K mol
C. Fe2O3(s) + 2Al(s) → Al2O3(s) + 2Fe(l) ΔH = -850 kJ/mol, ΔS = -243 J/K mol
To calculate ΔG at 298 K, we will use the equation ΔG = ΔH - TΔS. The temperature in Kelvin is 298 K, or 25°C.
A. ΔG = (484,000 J/mol) - (298 K) x (69.9 J/K mol) = +4165 J/mol (positive, non-spontaneous)
B. ΔG = (41,000 J/mol) - (298 K) x (-102.6 J/K mol) = -2874 J/mol (negative, spontaneous)
C. ΔG = (-850,000 J/mol) - (298 K) x (-243 J/K mol) = -42600 J/mol (negative, spontaneous)
for such more questions on reactions
https://brainly.com/question/11231920
#SPJ8
Which of the following has the greatest number of groups or branches?
A hexane
B. 3-ethylhexane
C. 2,3-dimethylpentane
D. 2-methylheptane
*correct answers only*
Answer:
C
Explanation:
Option C should be the correct one, since you have two methyl groups in the alkane (parent) chain.
electronegativity for radon?
PLEASE HELP
Fill in the blank: The bonds in an ionic compound________
electrons.
Answer:
Ionic bonding is the complete transfer of valence electron
Explanation:
In ionic bonds, the metal loses electrons to become a positively charged cation, whereas the nonmetal accepts those electrons to become a negatively charged anion.
A liquid ester used to flavour food is believed to be impure. What would be the best way of testing its purity?
Answer:
Filter it
Explanation:
If the volume of water in a cylinder is 8.0mL, but changes to 10.0mL when a solid is carefully lowered into it, the volume of the solid is?
Answer:
2 mL.
Explanation:
From the question given above, the following data were obtained:
Volume of water = 8 mL
Volume of water + solid = 10 mL
Volume of solid =?
The volume of the solid can be obtained as follow:
Volume of solid = (Volume of water + solid) – (Volume of water)
Volume of solid = 10 – 8
Volume of solid = 2 mL
Therefore, the volume of the solid is 2 mL
2.
Which mixture could be a useful buffer in a solution?
acetic acid (CH3CO2H) and hydrochloric acid (HCl)
sodium hydroxide (NaOH) and elemental sodium (Na)
ammonia (NH3) and ammonium chloride (NH4Cl)
acetic acid (CH3CO2H) and ammonia (NH3)
Pls answer quickly
Ammonia (\(NH_3\)) and ammonium chloride (\(NH_4Cl\)) mixture could be a useful buffer in a solution. Option C
A buffer is a solution that can resist changes in pH when small amounts of acid or base are added. It consists of a weak acid and its conjugate base or a weak base and its conjugate acid. The buffer system works by the principle of Le Chatelier's principle, where the equilibrium is shifted to counteract the changes caused by the addition of an acid or a base.
In option A, acetic acid (\(CH_3CO_2H\)) is a weak acid, but hydrochloric acid (HCl) is a strong acid. This combination does not form a buffer because HCl is completely dissociated in water and cannot provide a significant concentration of its conjugate base.
Option B consists of sodium hydroxide (NaOH), which is a strong base, and elemental sodium (Na), which is a metal. This combination does not form a buffer as there is no weak acid-base pair involved.
Option D contains acetic acid (\(CH_3CO_2H\)), a weak acid, and ammonia (\(NH_3\)), a weak base. Although they are weak acid and base, they do not form a buffer system together as they are both weak acids or bases and lack the required conjugate acid-base pair.
Option C, ammonia (\(NH_3\)), is a weak base, and ammonium chloride (\(NH_4Cl\)) is its conjugate acid. This combination can form a buffer system. When ammonia reacts with water, it forms ammonium ions (NH4+) and hydroxide ions (OH-).
The ammonium ions act as the weak acid, while the ammonia acts as the weak base. The addition of a small amount of acid will be counteracted by the ammonium ions, and the addition of a small amount of base will be counteracted by the ammonia, thus maintaining the pH of the solution relatively stable.
Therefore, option C, consisting of ammonia (\(NH_3\)) and ammonium chloride (\(NH_4Cl\)), is the suitable mixture that could be a useful buffer in a solution.
For more such question on buffer visit:
https://brainly.com/question/13076037
#SPJ8
Calculate what would be the minimum amount of energy (in joules) necessary to remove a ground-state electron (n = 1) completely from a single hydrogen atom. This process is also known as ionization. To answer this question, think about what value n must be in order to completely separate the electron from the hydrogen atom.
Answer:
E = 2.1 * 10^-18 Joules
Note: To completely remove an electron from the Hydrogen atom, n approaches infinity.
Explanation:
Check the attachment below
Rank the following compounds in order of increasing acidity using the periodic table. Place the least acidic compound at the top of the list and the most acidic compound at the bottom of the list.
H2O HBr HF
With the periodic table, order the following chemicals according to increasing acidity: H2O, HF, and HBr.
How would you rate an organic compound's acidity and basicity?Look at the atom containing the proton/electrons first when determining the acidity or basicity of a substance. Resonance, inductive effects (distant electronegativity effects), the orbitals involved, and the charge on that atom may also need to be taken into account at that point.
What substances are the most acidic?The center atom's electronegativeity determines how acidic the oxide is. Fluorine has the highest electronegativity among the chemicals listed; as a result, fluorine forms the most acidic oxide in the second phase.
To know more about periodic table visit:-
https://brainly.com/question/30706846
#SPJ4
Based on the information that is given, which atom is the table ?
Answer:
The one with the greatest mass would be the one that has the most things in the nucleus, protons and nutrons
Explanation:
871g of sodium chloride is how many moles
Answer:
14.9 mol
Explanation:
To find the number of moles in a given mass of a sample of sodium chloride (NaCl), we can multiply the number of grams in the sample by the molar mass of sodium chloride, which is 58.44 g/mol.
871 g × (1 mol / 58.44 g)
= 871/58.44 mol
≈ 14.9 mol
Note that we rounded to 3 significant figures in the final answer because that is how many significant figures were given in the mass measurement of the sodium chloride sample.