Unit 2 vocab

Question 1

Kinetic Theory

Answer 1

an explanation of how particles in gases behave.

Question 2

melting point

Answer 2

is the temp at which a solid becomes a liquid

Question 3

heat of fusion

Answer 3

the energy required to change a substance from a solid to liquid at its melting point

Question 4

boiling point

Answer 4

is the temp at which pressure of the vapor in the liquid is equal to the external pressure acting on the surface of the liquid

Question 5

heat of vaporization

Answer 5

the amount of energy required for the liquid at its boiling point to become a gas

Question 6

sublimation

Answer 6

the process of a solid changing strait from a solid to a gas without changing to a liquid

Question 7

plasma

Answer 7

matter that has enough energy to overcome not just the attractive forces between its particles but also the attractive forces within its atoms

Question 8

thermal expansion

Answer 8

is an increase in the size of a substance when the temp is increased

Question 9

buoyancy

Answer 9

is the ability of a fluid to exert an upward force on an object immersed in it

Question 10

viscosity

Answer 10

is the resistance of a fluid to a flowing

Question 11

substance

Answer 11

a type of matter with a fixed composition

Question 12

element

Answer 12

a substance made up of atoms that are all alike

Question 13

compound

Answer 13

a substance in which the atoms of two or more elements are chemically combined in a fixed position

Question 14

heterogeneous mixture

Answer 14

a mixture in which different materials remain distinct

Question 15

Homogeneous mixture

Answer 15

remains constantly and uniformly mixed

Question 16

solution

Answer 16

the same thing as a homogeneous mixture

Question 17

physical property

Answer 17

any characteristic of a material that you can observe without changing the identity of the substance remains the same

Question 18

physical change

Answer 18

a change in size shape or state of matter in which the identity of the substance remains the same

Question 19

distillation

Answer 19

the process of seperating substances in a mixture by evaporating a liquid and recondensing its vapor

Question 20

chemical property

Answer 20

any characteristic of a material that you can observe that produces one or more new substances

Question 21

chemical change

Answer 21

a change of one substance to another

Question 22

Law of conservation of mass

Answer 22

the mass of all substances that are present before a chemical equals the mass of all of the substances that remain after the change