Thermo Take Home Review Quiz 23-24

The topics covered by the study of thermodynamics include

• rates of chemical reactions.

• energy changes during chemical reactions.

• color changes during chemical reactions.

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-4

Energy is measured in units of

• joules.

• kelvins.

• pounds.

• grams.

What symbol is used to represent enthalpy?

• K

• H

• E

• None of the above

The specific heat of a substance is the amount of energy needed to raise the temperature of

• 1 g by 1 K.

• 1 mol by 1 K.

• 1 g by 1°F.

• 1 mol by 1°F.

Tags

NGSS.HS-PS3-4

Which of the following is not needed to calculate the energy required to increase the temperature of a substance?

• the mass of the substance

• the specific heat of the substance

• the molar mass of the substance

• the temperature change

For a given substance, the term ΔH refers to

• the total energy.

• the total enthalpy.

• the change in enthalpy.

• the change in temperature.

Given the total enthalpy of the products in a reaction and the total enthalpy of the reactants, what is ΔH for the reaction?

• enthalpy of product x enthalpy of reactants

• enthalpy of products / enthalpy of reactants

• enthalpy of product – enthalpy of reactants

• enthalpy of reactants – enthalpy of products

Tags

NGSS.HS-PS3-1

If the ΔH of a system is measured as –177 kJ, the change is

• endothermic.

• exothermic.

• either endothermic or exothermic.

• reversible.

Tags

NGSS.HS-PS1-4

The energy absorbed or released during a reaction in which a substance is produced is called the

• calorie change.

• standard condition.

• enthalpy of formation.

• heat.

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-1

According to Hess’s law, the overall enthalpy change in a reaction

• equals the difference of enthalpy changes for the individual steps in the reaction.

• equals the sum of enthalpy changes for the individual steps in the reaction.

• equals the enthalpy change of the first step in the reaction.

• cannot be determined from the enthalpy changes for the individual steps in the reaction.