matter

Question 1

substance

Answer 1

type of matter with fixed composition

Question 2

element

Answer 2

all atoms in a substance have the same identify

Question 3

compound

Answer 3

a substance in witch the atoms or two more elements are combined in fixed proportion

Question 4

homogeneous mixture

Answer 4

two or more gaseous liquid or solid substances blended throughout

Question 5

solution

Answer 5

a homogeneous mix of particles so small that they cannot be seen with a microscope and will never settle to the bottom of their container

Question 6

colloid

Answer 6

mix with particles larger than those in solutions but not heavy enough to settle put

Question 7

tyndall effect

Answer 7

scattering of light by colloidal particles

Question 8

suspension

Answer 8

heterogeneous mix containing a liquid in which visible particles settle

Question 9

heterogeneous

Answer 9

a mix in which different materials can be distinguished easily

Question 10

physical property

Answer 10

characteristics of a material that you can observe without changing the identity that make up the material

Question 11

physical change

Answer 11

change in shape size or state of matter

Question 12

distillation

Answer 12

separating substances in a mix by evaporating a liquid and recondensing its vapor

Question 13

chemical change

Answer 13

a change of one substance to another

Question 14

law of conservation of mass

Answer 14

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

Question 15

kinetic theory

Answer 15

how particles in matter behave

Question 16

melting point

Answer 16

temp. at witch a solid begins to liquefy

Question 17

heat of fusion

Answer 17

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

Question 18

boiling point

Answer 18

temp. at witch the pressure of the vapour in the liquid is equally to the external pressure acting of the surface of the liquid

Question 19

heat of vaporization

Answer 19

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

Question 20

diffusion

Answer 20

spreading of particles throughout a given volume until they are uniformly distributed

Question 21

plasma

Answer 21

matter consisting of positive and negative charged particles

Question 22

thermal expansion

Answer 22

an increase In the size of a substance when the temp Is increased

Question 23

buoyancy

Answer 23

the ability of a liquid fluid or gas to extert an upward force in an pbject immersed in it

Question 24

pressure

Answer 24

force exerted per unit area

Question 25

viscosity

Answer 25

the resistance to flow by liquid

Question 26

pascal

Answer 26

unit of pressure