phase, physical, chemical and energy changes

Question 1

Chemical change

Answer 1

-change in which new substances are
formed
-produces a set of chemicals which is DIFFERENT
from the set of chemicals which existed before the
change
-not reversible

Question 2

Physical change

Answer 2

-change in PHASE of a substance, no
new substances are formed
-does not change the set of chemicals involved
-a reversible change

Question 3

Melting point

Answer 3

when a solid changes to a liquid

Question 4

Freezing

Answer 4

when a liquid changes to a solid
• at melting/freezing temp the
• solid and liquid phases co‐exist

Question 5

Boiling

Answer 5

points at which a liquid changes into gas

Question 6

Condensation

Answer 6

gas changes into liquid
• at boiling/condensing temp the liquid and gas phase
co‐exist

Question 7

does the temperature change in a phase change?

Answer 7

no

Question 8

which has more heat, a physical or chemical change?

Answer 8

chemical change has much more

Question 9

Kinetic energy

Answer 9

The energy that molecules possess as

a result of their motion

Question 10

name all types of kinetic energy (do not explain)

Answer 10

translational, rotational, vibrational

Question 11

Rotational energy

Answer 11

Causes a molecule to rotate around one of its axes: x, y, z

Question 12

Vibrational energy

Answer 12

Changes the bond lengths and/or angles between

atoms in a molecule

Question 13

Translational energy

Answer 13

Causes the molecule to travel in a straight line from
place to place, but has no effect on bond lengths and
angles

Question 14

cation

Answer 14

positive ions

Question 15

anion

Answer 15

negative ions

Question 16

extensive properties

Answer 16

depends on the amounts of the substance

present

Question 17

intensive properties

Answer 17

depends solely on the nature of the

compound, not how much is present