Thermochemistry Quiz

In an endothermic reaction, heat is ...

• taken in or absorbed

• given out or released 

Tags

NGSS.HS-PS1-4

What is the definition of enthalpy in thermochemistry?

• The total kinetic energy of a system

• The heat content of a system at constant pressure

• The total potential energy of a system

• The temperature of a system

Which of the following is an example of an endothermic reaction?

• Combustion of gasoline

• Freezing of water

• cooking an egg

• Explosion of fireworks

Tags

NGSS.HS-PS1-4

What is the main characteristic of an exothermic reaction?

• It absorbs heat from the surroundings.

• It releases heat to the surroundings.

• It decreases the temperature of the surroundings.

• It requires light to proceed.

Which equation correctly represents the enthalpy change of a reaction?

Tags

NGSS.HS-PS1-4

In an exothermic reaction, the enthalpy of the products is:

• Higher than the enthalpy of the reactants.

• Lower than the enthalpy of the reactants.

• Equal to the enthalpy of the reactants.

• Unrelated to the enthalpy of the reactants.

Tags

NGSS.HS-PS1-4

Which statement is true for an endothermic reaction?

• The surroundings get warmer.

• The reaction releases heat to the surroundings.

• The reaction absorbs heat from the surroundings.

• The enthalpy of the products is lower than the reactants.

What happens to the energy in an exothermic reaction?

• Energy is absorbed from the surroundings.

• Energy is stored in the chemical bonds of the products.

• Energy is released into the surroundings.

• Energy is converted into mass.

Tags

NGSS.HS-PS1-4

• By measuring the change in volume of the reactants and products

• By measuring the temperature change of the surroundings

• By calculating the difference in mass of the reactants and products

• By observing the color change of the reactants

Tags

NGSS.HS-PS3-4

Which of the following is true about the enthalpy change of a chemical reaction?

• It is always positive.

• It is always negative.

• It can be either positive or negative, depending on whether the reaction is endothermic or exothermic.

• It does not change.

Tags

NGSS.HS-PS1-4