1.2 Changing State of Matter

Question 1

evaporate

Answer 1

to change from a liquid to a gas

Question 2

condense

Answer 2

to change from a gas to a liquid

Question 3

melt

Answer 3

to change from a solid to a liquid

Question 4

water vapor

Answer 4

the gas state of water

Question 5

freeze

Answer 5

to change from liquid to solid

Question 6

element

Answer 6

a pure substance that cannot be broken down into any simpler substance

Question 7

compound

Answer 7

any substance that is formed by the chemical combination of two or more elements and acts
like a single substance

Question 8

atom

Answer 8

the smallest unit of an element that retains the properties of that element

Question 9

proton

Answer 9

a particle in the nucleus of an atom that carries one unit of positive electric charge

Question 10

neutron

Answer 10

a particle in the nucleus of an atom that has no net electric charge

Question 11

electron

Answer 11

a particle in the space outside the nucleus of an atom that carries one unit of negative electric charge

Question 12

nucleus

Answer 12

an atom’s dense center, where most of its mass is

Question 13

molecule

Answer 13

a particle that contains more than one atom joined together

Question 14

state of matter

Answer 14

one of the three forms that matter can take-solid,liquid or gas

Question 15

melting point

Answer 15

the particular temperature for each substance at which it changes state from a solid to a liquid

Question 16

the boiling point

Answer 16

the particular temperature for each substance at which it changes state from a liquid to a gas

Question 17

the freezing point

Answer 17

the temperature at which a substance changes state from liquid to a solid