Thermochemistry — Chemistry Grade 11 · High School — Question Bank

Question 1 of 20Easy

An exothermic reaction is a reaction that ...

Question 2 of 20Easy

The characteristic of an endothermic reaction is ...

Question 3 of 20Easy

The following reaction that is exothermic is ...

Question 4 of 20Easy

The unit of standard enthalpy change is ...

Question 5 of 20Easy

If the reaction $N X_{2} + 3 H X_{2} 2 NH X_{3}$ has $Δ H = - 92$ kJ, the reaction ...

Question 6 of 20Easy

The symbol for standard enthalpy of formation is ...

Question 7 of 20Medium

Given bond energies H-H = 436, Cl-Cl = 242, and H-Cl = 431 kJ/mol, $Δ H$ for $H X_{2} + Cl X_{2} 2 HCl$ is ...

Question 8 of 20Medium

The heat to raise the temperature of 100 g of water by $10\,^\circ\text{C}$ is ... (specific heat of water $= 4.2 J/g^{\circ} C$ )

Question 9 of 20Medium

A reaction releases 45 kJ when 0.5 mol of reactant reacts. The $Δ H$ of the reaction is ...

Question 10 of 20Medium

Given $C + O X_{2} CO X_{2}$ $Δ H = - 394$ kJ and $CO + \frac{1}{2} O X_{2} CO X_{2}$ $Δ H = - 283$ kJ, $Δ H$ for $C + \frac{1}{2} O X_{2} CO$ is ...

Question 11 of 20Medium

The following substance that has $Δ H_{f}^{\circ} = 0$ is ...

Question 12 of 20Medium

On an energy diagram, if the products have lower energy than the reactants, the reaction is ...

Question 13 of 20Medium

Given $Δ H_{f}^{\circ}$ $CH X_{4} = - 75$ , $CO X_{2} = - 394$ , and $H X_{2} O = - 286$ kJ/mol, the $Δ H$ of combustion $CH X_{4} + 2 O X_{2} CO X_{2} + 2 H X_{2} O$ is ...

Question 14 of 20Medium

Breaking bonds between atoms in a molecule ...

Question 15 of 20Hard

50 mL of 1 M $HCl$ is mixed with 50 mL of 1 M $NaOH$ in a calorimeter and the temperature rises $6\,^\circ\text{C}$ . If the specific heat is $4.2 J/g^{\circ} C$ and density is 1 g/mL, the neutralization $Δ H$ is ...

Question 16 of 20Hard

Given $C + O X_{2} CO X_{2}$ $Δ H = - 394$ kJ; $H X_{2} + \frac{1}{2} O X_{2} H X_{2} O$ $Δ H = - 286$ kJ; $2 C X_{2} H X_{2} + 5 O X_{2} 4 CO X_{2} + 2 H X_{2} O$ $Δ H = - 2, 600$ kJ. $Δ H$ for $2 C + H X_{2} C X_{2} H X_{2}$ is ...

Question 17 of 20Hard

Complete combustion of 0.2 mol methane releases heat. If $Δ H_{c}$ $CH X_{4} = - 890$ kJ/mol, the heat released is ...

Question 18 of 20Hard

Given bond energies N≡N = 946, H-H = 436, and N-H = 391 kJ/mol, $Δ H$ for $N X_{2} + 3 H X_{2} 2 NH X_{3}$ is ...

Question 19 of 20Hard

Given $Δ H_{f}^{\circ}$ $NH X_{3} (g) = - 46$ , $H X_{2} O (g) = - 242$ , and $NO (g) = + 90$ kJ/mol, $Δ H$ for $4 NH X_{3} + 5 O X_{2} 4 NO + 6 H X_{2} O$ is ...

Question 20 of 20Hard

Given $2 H X_{2} + O X_{2} 2 H X_{2} O$ $Δ H = - 570$ kJ, the standard enthalpy of formation of $H X_{2} O$ is ...