Free Printable Kc calculations and acids and bases

Worksheets

Kc calculations and acids and bases

Total questions: 14

Worksheet time: 16mins

Name

Class

Date

A strong acid is defined as

a substance that only ionizes partially in an aqueous solution.

a substance that dissociates completely in an aqueous solution.

a substance that ionizes completely in an aqueous solution.

A substance that are able to donate more than one proton.

The Kc indicates

The relationship between the product and the reactant concentrations at equilibrium, and is constant at a specific temperature.

The measure of the extent of dissociation.

The measure of the extent of ionization for an acid.

Choose the CORRECT option:

A high Kc value indicates that a higher concentration of reactants than products are present.

A high Kc indicates that the equilibrium lies to the left.

A low Kc indicates that a lot of product has been formed and there is a higher concentration of products than reactants.

A low Kc indicates that the equilibrium lies to the right.

The name of the following common acid is:

HNO₃

Nitrateic acid

nitrate acid

Nitric acid

Ammoniac acid

The equilibrium expression for the following chemical reaction is:

2N₂(g) + 3H₂(g) $\leftrightarrow$ 2NH₃(g)

$Kc=\frac{\left[NH3\right]2}{\left[N2\right]2\left[H2\right]3}$

$Kc=\frac{\left[NH2\right]3}{\left[N2\right]2\left[H3\right]2}$

$Kc=\frac{\left[N2\right]2\left[H2\right]3}{\ \left[NH3\right]2}$

0.1908 mol CO₂, 0.0908 mol H₂, 0.0092 mol CO and 0.0092 mol of H₂O vapour are present in a 200cm³ reaction vessel at equilibrium. Calculate the value of the equilibrium constant (Kc) for the reaction :

CO₂(g) + H₂(g) $\leftrightarrow$ H₂O(g) + CO(g)

4.89 x10^-3

4, 98 x10^-3

4.89 x10³

0.000489

10 mol of CO(g) and 10 mol of O₂(g) are placed in a sealed container of volume 2dm³ at 700K. The system reaches equilibrium:

2CO(g) + O2 (g) $\leftrightarrow$ 2CO₂(g)

At equilibrium, there are 7 mol of CO₂ present in the container. Calculate the value of the equilibrium constant for this reaction at 700K.

6.18

1.68

8.61

Identify the Bronsted-Lowry acid and base in the reaction:

HCO₃- + HSO₄- $\rightarrow$ H₂CO₃ + SO₄²-

HCO₃^- is the base

HSO₄^- is the acid

HCO₃^- is the acid

HSO₄^- is the base

SO₄^2- is the base

HCO₃^-is the acid

The formula for the conjugate acid of NH₃is:

NH₂⁺

NH4⁺

NH₃⁺

10.

The formula for the conjugate base of HCO₃^- is:

H₂CO₃^2-

H₂CO₃

CO₃^-

CO₃^2-

11.

Identify the amphoteric substance in the following equations:

HCl(aq) + HS^-(aq) $\leftrightarrow$ Cl^- (aq) +H₂S(aq)

HCl(aq)

HS^-(aq)

Cl^-(aq)

H₂S (aq)

12.

A strong acid has a very weak conjugate base.

True

Fale

13.

The equation for dilute hydrochloric acid and copper oxide is:

CuO(s) + 2HCl (aq) $\rightarrow$ CuCl₂ (aq) + H₂O (l)

Cu₂O₂(s) + 2HCl (aq) $\rightarrow$ CuCl₂ (aq) + H₂O (l)

CuO(aq) + 2HCl (l) $\rightarrow$ CuCl₂ (aq) + H₂O (l)

14.

24g carbon and 36 gram water is heated in a closed container of volume 1dm³. The following equation is established: C(s) + H₂O(g) $\leftrightarrow$ CO(g) H₂(g)

The value of Kc for this reaction is 1. Calculate the number of moles of CO present in the container at equilibrium.

1.5

0.1

Reset

Kc calculations and acids and bases

Total questions: 14

Worksheet time: 16mins

Similar Resources on Wayground