Thermochemistry Review 1 period 1

Reactions that absorb heat are called

• endothermic

• exothermic

• Hess's reactions

• Specific heat

The energy used or produced during a chemical reaction is called the (2 choices)

• heat of reaction

• exothermic

• enthalpy

• endothermic

_______________ says that the ΔH for reactions are additive

• Avogadro's number

• Hess's Law

• Specific heat

• Thermochemistry

The__________ of a substance tell how much energy is needed to raise the temperature of 1 gram of that substance by 1 celsius.

• enthalpy

• Heat

• mass

• specific heat

____ is the study of heat changes during chemical and physical changes.

• Heat

• Thermochemistry

• Heat of reaction

• Energy

If a reaction is reversed, the ΔH for the reaction must be

• changed to opposite sign

• times by 2

• divided by 2

1 calorie is equal to

• 1 Calorie

• 4.184 Joules

• 273 Kelvin

• None of the above

A(n) _______ reaction is one that gives off heat

• endothermic

• exothermic

• heated

• specific heat

The amount of energy required to raise the temperature of 1g of pure water by 1 celsius is exactly to one ____

• specific heat

• heat

• calorie

_________ is the type of energy that always flows from warmer objects to cooler one.

• heat

• Specific heat

• endothermic

• exothermic