Free Printable Thermochemistry 1

1.

Given:

2Al(s) + $\frac{3}{2}$ $O_2$ (g) → $Al_2O_3$ (s) ΔH = −1670 kJ

Calculate the ΔH for the following reaction.
2 $Al_2O_3$ (s) → 4Al(s) + 3 $O_2$ (g) ΔH = ?

a)

+3340 kJ

b)

+1670 kJ

c)

$-$ 3340 kJ

d)

$-1670$ kJ

2.

Which of the following reaction represent the heat of formation of gaseous C₂H₆according to its definition?

a)

$2C\left(s\right)\ +\ 6H\left(g\right)\ \rightarrow\ C_2H_6\left(g\right)$

b)

$2C\left(s\right)\ +\ 3H_2\left(g\right)\ \rightarrow\ C_2H_6\left(g\right)$

c)

$2C\left(s\right)\ +\ 3H_2\left(l\right)\ \rightarrow C_2H_6\left(g\right)$

d)

$2CH_4\left(g\right)\ \rightarrow\ C_2H_6\left(g\right)\ +\ H_2\left(g\right)$

3.

Which of the following process has the negative value of enthalpy change, all the time?

a)

Enthalpy of atomisation

b)

Enthalpy of solution

c)

Enthalpy of formation

d)

Enthalpy of neutralisation

4.

Which of the following process is exothermic?

a)

$K\left(g\right)\ \rightarrow\ K^+\left(g\right)\ +\ e^-$

b)

$Br\left(g\right)\ +\ e^-\ \rightarrow\ Br^-\left(g\right)$

c)

$\frac{1}{2}Br_2\left(l\right)\ \rightarrow\ Br\left(g\right)$

d)

$KBr\left(s\right)\ \rightarrow\ K^+\left(g\right)\ +\ Br^-\left(g\right)$

5.

Which of the following reactions involves the enthalpy of formation?

a)

$C\left(g\right)\ +\ \frac{1}{2}O_2\left(g\right)\ \rightarrow\ CO\left(g\right)$

b)

$Na^+\left(g\right)\ +\ Cl^-\left(g\right)\ \rightarrow\ NaCl\left(s\right)$

c)

$K\left(s\right)\ +\ Cl\left(g\right)\ \rightarrow\ KCl\left(s\right)$

d)

$Na\left(s\right)\ +\ \frac{1}{2}Br_2\left(l\right)\ \rightarrow\ NaBr\left(s\right)$

6.

Which of the following equations correspond to both enthalpy of formation and enthalpy of combustion?

a)

$C\left(s\right)\ +\ \frac{1}{2}O_2\left(g\right)\ \rightarrow\ CO\left(g\right)$

b)

$H_2\left(g\right)\ +\ O_2\left(g\right)\ \rightarrow\ H_2O_2\left(l\right)$

c)

$H_2\left(g\right)\ +\ \frac{1}{2}O_2\left(g\right)\ \rightarrow\ H_2O\left(l\right)$

d)

$CH_4\left(g\right)\ +\ 2O_2\left(g\right)\ \rightarrow\ CO_2\left(g\right)\ +\ 2H_2O\left(l\right)$

7.

The enthalpy of neutralisation of dilute sulphuric acid by aqueous sodium hydroxide is the heat evolved when...

a)

1 g of H₂SO₄ reacts with 1 g of NaOH

b)

0.5 mol of H₂SO₄ reacts with 1 mol of NaOH

c)

1 mol of H₂SO₄ reacts with 0.5 mol of NaOH

d)

1 mol of H₂SO₄ reacts with 2 mol of NaOH

8.

Based on the information above, choose the corrects statements

a)

The enthalpy change for the conversion from R to P is +40 kJ

b)

The enthalpy change for the conversion from P to Q is +30 kJ

c)

Formation of Q from P is exohermic

d)

The enthalpy change from S to Q is endothermic

9.

Calculate the amount of heat needed to increase the temperature of 2.0 g of iron (Fe) by $2\ ^oC$ .

Given the specific heat capacity of iron is $0.44\ Jg^{-1}\ ^oC^{-1}$

a)

0.88 J

b)

1.76 J

c)

0.44 J

d)

0.66 J

10.

Which of the following ionic compound has the largest lattice energy?

a)

NaBr

b)

NaCl

c)

KBr

d)

KCl

Thermochemistry 1

Total questions: 10

Worksheet time: 20mins

Similar Resources on Wayground