science 3

Question 1

substance

Answer 1

a particular kind of matter with uniform properties.

Question 2

element

Answer 2

a part or aspect of something abstract, especially one that is essential or characteristic.

Question 3

compound

Answer 3

something formed by a union of elements or parts

Question 4

Heterogeneous mixture

Answer 4

a mixture in which the composition is uniform throughout the mixture

Question 5

Homogeneous mixture

Answer 5

A homogeneous mixture is a mixture in which the composition is uniform throughout the mixture

Question 6

. Solution

Answer 6

a liquid mixture in which the minor component the solute is uniformly distributed within the major component the solvent.

Question 7

Colloid

Answer 7

a homogeneous substance consisting of large molecules or ultramicroscopic particles of one substance dispersed through a second substance.

Question 8

Tyndall effect

Answer 8

light scattering by particles in a colloid .

Question 9

Suspension

Answer 9

a punishment in which a person is temporarily not allowed to work, go to school, or take part in an activity

Question 10

Physical property

Answer 10

A physical property is any property of a physical system that is measurable

Question 11

Physical change

Answer 11

the material involved in the change is structurally the same before and after the change.

Question 12

Distillation

Answer 12

the process of separating the components of a liquid mixture through selective evaporation and condensation

Question 13

Chemical property

Answer 13

A chemical property is any of a material’s properties that becomes evident during, or after, a chemical reaction.

Question 14

Chemical change

Answer 14

the result of a chemical reaction

Question 15

Law of conservation of mass

Answer 15

mass is neither created nor destroyed in chemical reactions.

Question 16

Kinetic theory

Answer 16

a simple classical model of the thermodynamic behavior of gases.

Question 17

Heat of fusion

Answer 17

the amount of energy required to convert one mole of solid into liquid.

Question 18

Boiling point

Answer 18

the temperature at which the vapour pressure is equal to the standard sea-level atmospheric pressure

Question 19

Heat of vaporization

Answer 19

The enthalpy of vaporization is a function of the pressure and temperature

Question 20

Diffusion

Answer 20

Diffusion is the net movement of anything generally from a region of higher concentration to a region of lower concentration.

Question 21

. Plasma

Answer 21

a state of matter along with solids, liquids and gases

Question 22

Thermal expansion

Answer 22

the increase or expansion of materials as a function of heat

Question 23

boyancy

Answer 23

a net upward force exerted by a fluid that opposes the weight of a partially or fully immersed object.

Question 24

pressure

Answer 24

the force applied perpendicular to the surface of an object per unit area over which that force is distributed.

Question 25

viscosity

Answer 25

the resistance of a fluid (liquid or gas) to a change in shape or movement of neighbouring portions relative to one another.

Question 26

buoyancy

Answer 26

the ability or tendency to float in water or air or some other fluid.

Question 27

pascal

Answer 27

unit of pressure in the International System of Units