Thermochemical Equations and Calorimetry Quiz

What must be included in a thermochemical equation to accurately represent the enthalpy change?

• The volume of the container

• The color of the reactants

• The phase labels of substances

• The speed of the reaction

If a thermochemical equation is reversed, what happens to the delta H?

• It becomes zero

• It doubles

• It changes sign

• It remains unchanged

How does doubling the number of moles of ammonia produced affect the delta H?

• Delta H is halved

• Delta H remains the same

• Delta H is doubled

• Delta H becomes zero

What is the sign of delta H for the decomposition of ammonia?

• Positive

• Negative

• Zero

• It depends on the temperature

In a stoichiometry problem, what is the first step when given the mass of a substance?

• Convert mass to temperature

• Convert mass to moles

• Convert mass to volume

• Convert mass to energy

What is the primary purpose of a calorimeter?

• To measure the volume of gases produced

• To measure the color change in a reaction

• To measure the heat absorbed or released

• To measure the speed of a reaction

What is specific heat?

• The heat required to raise the temperature of one gram of a substance by one degree Celsius

• The heat required to freeze a substance

• The heat required to boil a substance

• The heat required to melt a substance

Which type of calorimeter is typically used for intense reactions?

• Digital calorimeter

• Coffee cup calorimeter

• Open-air calorimeter

• Bomb calorimeter

When calculating the heat of solution, what must be added to the mass of water?

• The mass of the solute

• The mass of the container

• The mass of the solvent

• The mass of the air

What is the enthalpy change in kJ per mole for an endothermic reaction if the calculated delta H is 46,000 J per mole?

• 46 kJ per mole

• 0.46 kJ per mole

• 460 kJ per mole

• 4.6 kJ per mole