Exploring Thermochemistry Concepts

What does the 'ΔT' in the equation Q=MCΔT represent?

• Temperature decrease

• Temperature increase

• Total temperature

• Change in temperature

What is the unit for specific heat in the equation Q=MCΔT?

• Joules

• Kilocalories

• Joules per gram degree Celsius

• Calories

What does a calorimeter measure?

• Volume of a liquid

• Heat flow and measurement

• Mass of a substance

• Density of a solution

In a calorimetry experiment, if the Q of water is negative, what does it indicate about the reaction?

• Equilibrium

• No reaction

• Endothermic

• Exothermic

What is the final step in calculating the ΔH of a reaction in a calorimetry lab?

• Changing the sign of Q of water

• Converting joules to kilojoules

• Calculating the mass of the salt

• Dividing kilojoules by moles

What is the purpose of reversing the sign of Q of water in calorimetry calculations?

• To represent energy absorbed or released

• To indicate a chemical change

• To show energy conservation

• To balance the equation

What is indicated by a negative ΔH in a calorimetry experiment?

• The reaction is at equilibrium

• The reaction absorbs heat

• No reaction occurred

• The reaction releases heat

How many kilocalories are in a gram of fat?

• 9 kilocalories

• 4 kilocalories

• 1000 calories

• 1 kilocalorie

In the context of food, what does one calorie equal?

• 1000 real calories

• 1 joule

• 1 kilojoule

• 100 calories

In stoichiometry, what does the coefficient in the chemical equation represent?

• The number of moles

• The molar mass

• The volume of the reactants

• The ratio of reactants to products