Thermochemistry

Question 1

calorie (cal)

Answer 1

The amount of energy required to raise one gram of water by 1 degree celsius. (or 1 kelvin)

Question 2

Calorie

Answer 2

Commonly used in quantifying food energy content. also known as a kilocalorie

Question 3

Joule (J)

Answer 3

The amount of energy used when a force of 1 newton moves an object 1 meter.

Question 4

1 calorie = ?

Answer 4

= 4.184 joules

Question 5

Heat capacity (C)

Answer 5

The amount of heat (q) a body of matter absorbs or releases when it experiences a temperature change (ΔT) of 1 °C (or 1 kelvin)

Question 6

Heat capacity equation

Answer 6

C=q/ΔT

Question 7

What sort of property is heat capacity?

Answer 7

Extensive property — Depends on the size of the substance

Question 8

Specific heat capacity (c)

Answer 8

the quantity of heat required to raise the temperature of 1 gram of a substance by 1 °C (or 1 kelvin)

Question 9

What type of property is specific heat capacity?

Answer 9

Intensive property — It only depends on the identity of the substance, not the amount.

Question 10

equation for the amount of heat (q) entering or leaving a substance

Answer 10

q= (c)(m)(ΔT) . Delta T means the initial temperature (Ti) is subtracted from the final temperature (Tf)

Question 11

If a substance gains thermal energy (Tf>Ti), then the value of q is

Answer 11

Positive

Question 12

If a substance loses thermal energy (Tf<Ti), then the value of q is

Answer 12

negative

Question 13

Calorimetry

Answer 13

Used to measure the amount of heat transferred to or from a substance

Question 14

System

Answer 14

The substance of substances undergoing the chemical or physical change

Question 15

Surroundings

Answer 15

All other matter, including components of the measurement apparatus, that serve to either provide heat to the system or absorb heat from the system

Question 16

Thermochemistry

Answer 16

The study of heat absorbed or released during chemical and physical changes

Question 17

Thermal Energy

Answer 17

A type of kinetic energy (KE) associated with the random motion of atoms and molecules

Question 18

Temperature

Answer 18

The quantitative measure of hot or cold

Question 19

Fast Moving molecules mean—>

Answer 19

High thermal energy giving a “hot” temperature

Question 20

Slow moving molecules mean —>

Answer 20

Low thermal energy giving a “cold” temperature

Question 21

Heat

Answer 21

Also abbreviated as (q). Is the transfer of thermal energy between two bodies at different temperatures

Question 22

Heat Flow

Answer 22

This increases the thermal energy of one body and decreases the thermal energy of the other

Question 23

How long will thermal energy flow from one body to another?

Answer 23

When two substances are placed in contact, thermal energy will always flow from a high temperature substance to the low temperature substance until both substances are at the same temperature.

Question 24

Exothermic process

Answer 24

A change that releases heat (heat is exiting the substance)

Question 25

Endothermic process

Answer 25

A change that absorbs heat (en like in because heat is going into the substance)