[CHEM] Unit 8- Matter and Heat

Question 1

The process of going from S to G is ___ and from G to S is ___

Answer 1

Sublimation, deposition

Question 2

These two elements sublime under normal circumstances:

Answer 2

I2 (iodine) and CO2 (carbon dioxide)

Question 3

To convert from K to C, you ___ 273

Answer 3

SUBTRACT

Question 4

To convert from C to K, you ___ 273

Answer 4

ADD

Question 5

Temperature is the measure of the average ____

Answer 5

Kinetic energy

Question 6

Kinetic energy is related to the ___

Answer 6

The speed of the motion of particles

Question 7

A triple point is where ___

Answer 7

All the lines meet; all three phases are in equilibrium together

Question 8

Above the critical point/temperature, it is ___

Answer 8

Impossible to condense a gas into liquid by just increasing the temperature- additionally, above this point gas and liquid are indistinguishable from each other

Question 9

In a phase diagram, if the solid is MORE dense than liquid, it will have a ___ curve

Answer 9

Positive

Question 10

In a phase diagram, if the solid is LESS dense than liquid, it will have a ___ curve

Answer 10

Negative

Question 11

Endothermic is ____

Answer 11

Putting heat in (heat is a reactant)

Question 12

Exothermic is ___

Answer 12

Taking heat out (heat is a product)

Question 13

Boiling is ___, freezing is ___

Answer 13

Endothermic, exothermic

Question 14

In a heating or cooling curve chart (H/C curve), the flat areas are the ___

Answer 14

Phase changes

Question 15

During phase changes, only ___ energy changes

Answer 15

Potential

Question 16

In a H/C curve, the diagonal regions are ___

Answer 16

Single phases warming or cooling

Question 17

During cooling or warming, only ___ energy and ___ changes

Answer 17

Kinetic, temperature

Question 18

T/F: The freezing point of a substance is the same as the melting point

Answer 18

T

Question 19

T/F: The boiling point of a substance in a cooling curve IS NOT the point where the gas begins to condense

Answer 19

F- the BP IS the point

Question 20

Equation for energy change in boiling: q(___)=m(___)Hv(___)

Answer 20

Heat (in Joules), mass (in grams), and the heat of vaporization (tells you how much heat is needed to boil 1 gram at its BP)

Question 21

For water, the heat of vaporization is ___ J(g)

Answer 21

2260

Question 22

Equation for energy change in melting: q(___)= m(___)Hf(___)

Answer 22

Heat, mass, and heat of fusion (jow much heat is needed to melt 1 gram at its BP)

Question 23

For water, the heat of fusion is ___J(g)

Answer 23

334

Question 24

Equation for energy change in the diagonals (single phase): q(___)= m(___)c(___)∆T(___)

Answer 24

Heat (in Joules), mass (in grams), specific heat [capacity] (how much energy/heat is takes to raise the temp of 1 gram sample by 1C), change in T (always final-initial)

Question 25

For specific heat capacity, the unit is ___

Answer 25

J/g°C

Question 26

The specific heat capacity of water in the solid phase is ___ J/g°C

Answer 26

2.09

Question 27

The specific heat capacity of water in the liquid phase is ___ J/g°C

Answer 27

4.18

Question 28

The specific heat capacity of water in the gas phase is ___ J/g°C

Answer 28

1.84