Which two factors must be equal when a chemical reaction reaches equilibrium?(1) the concentration of the reactants and the concentration of the products
(2) the number of reactant particles and the number of product particles
(3) the rate of the forward reaction and the rate of the reverse reaction
(4) the mass of the reactants and the mass of the products

Answers

Answer 1

Answer: The correct answer is the statement in option 3. Chemical equilibrium is achieved when both the reactants and the products are in concentrations that has no further tendency to change even as time goes to infinity. This happens when the forward reaction rate is the same as the reverse reaction rate.

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Consider the reaction of CaC2 and water to produce CaCO3 and NH3 according to the reaction CaCN2 + 3H2O → CaCO3 + 2 NH3 . How much CaCO3 is produced upon reaction of 45 g CaCN2 and 45 g of H2O

Answers

Answer:

16.27 g of CaCO3 are produced upon reaction of 45 g CaCN2 and 45 g of H2O.

Explanation:

Ca(CN)2 + 3H2O → CaCO3 + 2 NH3

First of all, let's find out the limiting reactant.

Molar mass Ca(CN)2.

Molar mass H2O: 18 g/m

Moles of Ca(CN)2: mass / molar mass

45 g / 92.08 g/m = 0.488 moles

Moles of H2O: mass / molar mass

45g / 18g/m = 2.50 moles

This is my rule of three

1 mol of Ca(CN)2 needs 3 moles of H2O

2.5 moles of Ca(CN)2 needs (2.5 . 3) / 1 = 7.5 moles

I need 7.5 moles of water, but I only have 0.488. Obviously water is the limiting reactant; now we can work on it.

3 moles of water __ makes __ 1 mol of CaCO3

0.488 moles of water __ makes ___ (0.488 . 1) / 3 = 0.163 moles

Molar mass CaCO3 = 100.08 g/m

Molar mass . moles = mass

100.08 g/m . 0.163 moles = 16.27 g

What is the difference between neutralization and saturation?

Answers

Neutralization deals with the buffering or neutralizing of acids and bases. You change the pH of either an acid or a base by adding H+ ions to a base solution or adding OH- ions by adding a base(alkali) to an acid solution. Ideally you are neutralizing either one to a neutral pH condition which is "7" on the pH scale.

Saturation on the other hand deals with how much solute (solid) you can disolve in a solvent. As you add solute to solution it can only disolve a certain amount before the solvent becomes "satutated" and no more solute will desolve into a homogenous blend with the solvent. You then see precepitants start coming out of solution and falling to the bottom of the container the solution is contained in.

The interaction of tectonic plate boundaries is associated with which of the following events? Hurricanes Tropical storms Earthquakes Tornados Previous Question

Answers

Answer:

terremotos

Explanation:

BaCl2 (aq) and K2CrO4 (aq) combine in a double replacement reaction. Select the reaction below that correctly represents the products of the reaction. BaCl2 (aq) + K2CrO4 (aq) Ba (s) + 2KCl (aq) + 2Cr (s) + 2O2 (g) BaCl2 (aq) + K2CrO4 (aq) BaCrO4 (s) + 2KCl (aq) BaCl 2 (aq) + K2CrO4 (aq) BaCrO3 (s) + 2KCl (aq) + O (g) BaCl2 (aq) + K2CrO4 (aq) BaCrO4 (s) + KCl (aq)

Answers

The correct answer is BaCl2(aq) + K2CrO4(aq) = BaCrO4(s) + 2KCl(aq). According to the solubility of ions, BaCrO4 is insoluble compounds. So the products should be BaCrO4 and KCl.

Answer:

BaCl2(aq) + K2CrO4(aq) = BaCrO4(s) + 2KCl(aq).

Explanation:

Which of the following molecules has a bent structure?A. O2
B. CO2
C. H2O
D. CH4

Answers

Answer : The correct option is, (C) $H_2O$

Explanation :

Formula used:

$\text{Number of electrons}=(1)/(2)[V+N-C+A]$

where,

V = number of valence electrons present in central atom

N = number of monovalent atoms bonded to central atom

C = charge of cation

A = charge of anion

First we have to determine the hybridization of the following molecules.

(a) $O_2$

This is diatomic molecule and diatomic molecules always form linear shape.

(b) $CO_2$

$\text{Number of electrons}=(1)/(2)* [4]=2$

The number of electrons is 2 that means the hybridization will be $sp$ and the electronic geometry of the molecule will be linear.

(c) $H_2O$

$\text{Number of electrons}=(1)/(2)* [6+2]=4$

The number of electrons is 4 that means the hybridization will be $sp^3$ and the electronic geometry of the molecule will be tetrahedral.

But as there are two atoms around the central oxygen atom, the third and fourth position will be occupied by lone pair of electrons. The repulsion between lone and bond pair of electrons is more and hence the molecular geometry will be bent.

(d) $CH_4$

$\text{Number of electrons}=(1)/(2)* [4+4]=4$

The number of electrons is 4 that means the hybridization will be $sp^3$ and the electronic geometry of the molecule will be tetrahedral.

Hence, the molecule has bent structure will be, $H_2O$

H2O has a bent structure. The oxygen atom is in the center, and the hydrogen atoms are attached but pointing downward. It's not linear because there are two unshared pairs of electrons on oxygen that take up their own spaces.

Which activity performed by a chemist is primarily based on an understanding of physics?

Answers

physical science, is the study of the composition, structure, properties and change of matter.[1][2] Chemistry is chiefly concerned with atoms and their interactions with other atoms - for example, [ the properties of the chemical bonds formed between atoms to create chemical compounds. As well as this, interactions including atoms and other phenomena - electrons and various forms of energy—are

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