Unit 2 - Matter and Energy

Question 1

As heat is added to a substance undergoing a phase change, the temperature remains constant because the energy is being used to —

Answer 1

overcome intermolecular forces

Question 2

Charles Law (gas is held at a constant pressure, then its volume is directly proportional to the absolute temp) this law explains—?

Answer 2

Gas-filled ballon expands when heated

Question 3

Pressure and Volume are

Answer 3

Inversely proportional

Question 4

Most efficient way to determine whether a chemical reaction is exothermic is by using

Answer 4

A thermometer (temperature probe)

Question 5

According to the kinetic-molecular theory of gases, molecules of an ideal gas—

Answer 5

Undergo elastic collisions

Question 6

strongest intermolecular forces to least

Answer 6

Solid - Liquid - Gas

Question 7

In reactions:
Exothermic has heat —
Endothermic has heat—

Answer 7

1. Releasing

2. Absorbing

Question 8

Definite shape and volume
Incompressible, does not expand when heated
Molecules tightly packed

Answer 8

Solid

Question 9

Definite volume (shape of container)
Molecules not rigidly packed
Can move past each other, incompressible
Low expansion on heating

Answer 9

Liquid

Question 10

No definite shape or volume
Molecules loosely packed
Easily compressed

Answer 10

Gas

Question 11

Are particles highly attracted to each other in solids or gases

Answer 11

Solids

Gases have less attraction bc of distance

Question 12

Energy - highest to lowest

Answer 12

Gas - liquid -solid

Question 13

Makes assumptions regarding the size, motion and energy of particles. Described behavior in terms of particles in motion

Answer 13

The Kinetic Molecular Theory

Question 14

Gas particles are smaller in size so no repulsive or attractive forces

Answer 14

Particle Size

Question 15

All particle in gas have same mass, but not same energy. If temp increases, kinetic energy increased and vice versa

Answer 15

Particle Energy

Question 16

Pressure is what to volume

Answer 16

Inversely proportional

Question 17

Temperature and volume are

Answer 17

Directly proportional

Question 18

Pressure and temperature are

Answer 18

Directly proportional

Question 19

What happens to ice when it is placed in water?

Answer 19

Ice absorbs energy from water which is used for breaking force of attraction between ice particles, then making ice melt

Question 20

Endo where energy is what in equation

Eco where energy is what in equation

Answer 20

1. First

2. Last

Question 21

How does behavior of molecules change as a substance is heated

Answer 21

Molecules will move faster due to increase in kinetic energy

Question 22

What if more substance was added to a heated substance?

Answer 22

The motion of molecules would slow down due to cedrease in kinetic energy

Question 23

In what phase(a) does a substance exist at its triple point

Answer 23

Solid, liquid, gas

Question 24

What causes cloudy layer outside of glass on hot day?

Answer 24

Different temps inside and outside glass

Question 25

Why does alcohol level in the thermometer lowers when placed in contact with cooler objects

Answer 25

The average kinetic energy decreases