unit 13

Question 1

energy

Answer 1

the capacity to supply heat or do work

Question 2

thermal energy

Answer 2

kinetic energy associated with the random motion of atoms and molecules

Question 3

heat

Answer 3

the transfer of thermal energy between two bodies at different temperatures

Question 4

q unit

Answer 4

joules

Question 4

temperature

Answer 4

quantitative measure of “hot” or “cold”

increase when heated; decreases when cooled

Question 5

kinetic energy

Answer 5

the energy of motion, observable as the movement of an object or subatomic particle.

Question 6

m unit

Answer 6

grams (g)

Question 6

can all substances change into all 3 states of matter

Answer 6

no

Question 6

what is STP?

Answer 6

standard temperature (0c) and pressure (1 ATM)

Question 7

what is triple point

Answer 7

Point where solid, liquid, and gas exist at the same time

Question 7

q:

Answer 7

heat

Question 8

q =

Answer 8

mC∆T

Question 9

m:

Answer 9

mass

Question 10

Ti

Answer 10

Initial Temperature

Question 10

Tf

Answer 10

Final Temperature

Question 10

c:

Answer 10

specific heat

Question 11

calorimeter thermometer

Answer 11

measure the temperature change (∆T)

Question 11

c unit

Answer 11

J/gᐧ℃

Question 11

∆T unit

Answer 11

K or ℃

Question 12

∆T:

Answer 12

change in tempature

Question 13

∆T equation

Answer 13

∆T = Tf - Ti

Question 13

The only rule for temperature is

Answer 13

NEVER CONVERT ∆T’s UNITS! ONLY CONVERT Ti and Tf.

Question 14

calorimeter stirring rod

Answer 14

keep T even throughout

Question 15

calorimeter lid

Answer 15

keep heat from escaping

Question 16

calorimeter Styrofoam cup

Answer 16

insulates / keeps heat in

Question 17

calorimeter water

Answer 17

absorbs heat from a sample

Question 18

calorimeter

Answer 18

an apparatus for measuring the amount of heat involved in a chemical reaction or other process.

Question 19

calorimeter sample (system)

Answer 19

substance with unknown specific heat

Question 20

density formula

Answer 20

D= m/V

Question 21

Volume (block) formula

Answer 21

L x W x H

Question 22

critical point

Answer 22

the point in temperature and pressure on a phase diagram where the liquid and gaseous phases of a substance merge together into a single phase

Question 22

deposition

Answer 22

the transition of a substance directly from the gas to the solid state

Question 22

sublime

Answer 22

the transition of a substance directly from the solid to the gas state

Question 22

supercritical fluid

Answer 22

any substance at a temperature and pressure above its critical point, where distinct liquid

Question 22

Ea (Activation Energy)

Answer 22

the minimum amount of energy that must be provided for compounds to result in a chemical reaction

Question 23

bar =

Answer 23

100 kPa

Question 23

activated complex

Answer 23

peak of diagram

Question 23

ΔH (Enthalpy)

Answer 23

the amount of heat released or absorbed during a chemical reaction at a constant pressure

Question 23

heat of reaction formula

Answer 23

ΔHproducts -ΔHreactants

Question 24

symbol for a reaction that can be reversed

Answer 24

(⇋ or ↔ or ⇄)

Question 24

when reaction is exothermic, ΔH is

Answer 24

negative

Question 24

chemical potential energy

Answer 24

the energy stored in the chemical bonds of a substance

Question 24

endothermic reaction

Answer 24

gains heat

Question 24

y axis

Answer 24

potential energy

Question 24

exothermic reaction

Answer 24

looses heat

Question 25

x axis

Answer 25

reaction progress

Question 26

activation energy formula

Answer 26

Ea = highest kJ - lowest kJ

Question 27

if it is exothermic in the forward direction,

Answer 27

its endothermic in reverse