Unit 1 Honors Thermochemistry Deck 2

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The energy you need to make a substance boil is called

Heat of vaporization

Energy transfer that occurs between liquids or gases is called

Convection

The energy you need to melt a substance is called

Heat of fusion

What two things impact the heat capacity of a substance?

mass and composition

What unit of temperature do you use for heat calculation?

Celsius

Devices used to measure the amount of heat absorbed or released during chemical or physical processes

Calorimeter

The transfer of energy between two objects

Heat

If a sample of water cools after you add a chemical to it then the reaction is [...] and heat is absorbed and the sign for value of q is positive

endothermic

Energy of motion

Kinetic energy

If a sample of water warms up after you add a chemical to it then the reaction is [...] and heat is released and the sign for value of q is negative

exothermic

The formula to calculate heat is

q= mc∆T

If a sample of water cools after you add a chemical to it then the reaction is endothermic and heat is [...] and the sign for value of q is [...]

absorbed; positive

The numerical value for the specific heat capacity of water is

4.18

Energy based on the composition of a substance

potential energy

The amount of heat it takes to change the temperature of exactly 1 g of substance by 1 degrees Celsius

Specific Heat Capacity

Energy transfer that occurs through solids is called

Conduction

What are two units of measurement for energy?

Calorie and Joule

The amount of heat it takes to change an object’s temperature by exactly 1 degrees Celsius

Heat capacity

Metals have [...] specific heat capacity values compared to water

low

Energy transfer that does not require any medium to transfer through is

Radiation

Which type of material prevents the transfer of energy through it is

Insulator

The [...] the specific heat a substance has the faster it will heat up.

lower

When a chemical dissolves in water the system is the [...] and the surroundings is the [...]

chemical; water

Which way does energy always go between two objects?

Warmer object to cooler object

Whenever you touch the calorimeter a chemical reaction is occurring and feel cold, the reaction is [...]

endothermic

Whenever you touch the calorimeter a chemical reaction is occurring and feel warmth, the reaction is [...]

exothermic

In a heating curve the kinetic energy changes at the [...] lines and stays constant at the [...] lines

diagonal; horizontal

If a sample of water warms up after you add a chemical to it then the reaction is exothermic and heat is [...] and the sign for value of q is [...]

released; negative