Matter Unit Vocab

Question 1

Element or compound that cannot be broken down into simpler components and maintain the properties of the original substance.

Answer 1

Substance

Question 2

Substance with atoms that are all alike.

Answer 2

Element

Question 3

Substance formed from two or more elements in which the exact combination and proportion of elements is always the same.

Answer 3

Compound

Question 4

Mixture such as missed nuts or a dry soup mix, in which different materials are unevenly distributed and are easily identified.

Answer 4

Heterogeneous Mixture

Question 5

Solid, liquid, or gas that contains two or more substances blended evenly throughout.

Answer 5

Homogeneous Mixture

Question 6

Homogeneous mixture that remains constantly and uniformly mixed and has particles that are so small they cannot be seen with a microscope.

Answer 6

Solution

Question 7

Heterogeneous mixture whose particles never settle.

Answer 7

Colloid

Question 8

Scattering of a light beam as it passes through a colloid.

Answer 8

Tyndall Effect

Question 9

Heterogeneous mixture containing a liquid in which visible particles settle.

Answer 9

Suspension

Question 10

Any characteristic of a material, such as size or shape, that you can observe or attempt to observe without changing the identity of the material.

Answer 10

Physical Property

Question 11

Any change in size, shape, or state of matter in which the identity of the substance remains the same.

Answer 11

Physical Change

Question 12

Process than can separate two substances in a mixture by evaporating a liquid and recondensing its vapor.

Answer 12

Distillation

Question 13

Any characteristic of a substance, such as flammability, that indicates whether it can undergo a certain chemical change.

Answer 13

Chemical Property

Question 14

Change of one substance into a new substance.

Answer 14

Chemical Change

Question 15

Substances present before a chemical change equals the mass of all the substances remaining after the change.

Answer 15

Law of Conservation of Mass

Question 16

Explanation of the behavior of molecules in matter; states that all matter is made of constantly moving particles that collide without losing energy.

Answer 16

Kinetic Theory

Question 17

Temperature at which a solid begins to liquefy.

Answer 17

Melting Point

Question 18

Amount of energy required to change a substance from the solid phase to the liquid phase.

Answer 18

Heat of Fusion

Question 19

The temperature at which the pressure of the vapor in the liquid is equal to the external pressure acting on the surface of the liquid.

Answer 19

Boiling Point

Question 20

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

Answer 20

Heat of Vaporization

Question 21

Spreading of particles throughout a given volume until they are uniformly distributed.

Answer 21

Diffusion

Question 22

Matter consisting of positively and negatively charged particles.

Answer 22

Plasma

Question 23

Increase in the size of a substance
when the temperature is increased.

Answer 23

Thermal Expansion

Question 24

Ability of a fluid—a liquid or a gas—to exert an upward force on an object immersed in the fluid.

Answer 24

Buoyancy

Question 25

Amount of force exerted per unit area; SI unit is the pascal (Pa).

Answer 25

Pressure

Question 26

A fluid’s resistance to flow.

Answer 26

Viscosity

Question 27

SI unit of pressure.

Answer 27

Pascal