Lec.1

Question 1

Anything made of particles. It has mass and volume

Answer 1

Matter

Question 2

Matter is made up of particles, which called

Answer 2

atoms

Question 3

When you add or subtract heat from a substance, you can change its

Answer 3

state of matter

Question 4

The state of matter of a substance is determined by

Answer 4

how much energy its particles have.

Question 5

Both atoms and molecules are held together by a form of

Answer 5

potential energy
called chemical energy

Question 6

Basis of Classification of the Four Types of Matter

Answer 6

Based upon

particle arrangement ,
energy of particles ,
distance between particles

Question 7

In chemistry and chemical physics, a mesophase is a state of matter intermediate between

Answer 7

solid and liquid

Question 8

In chemistry and chemical physics, a mesophase is a state of matter intermediate between

Answer 8

solid and liquid

Question 9

Gelatin and biological structures such as the lipid bilayers of cell membranes are examples of

Answer 9

mesophases

Question 10

The fundamental difference between states of matter is

Answer 10

the strength of the intermolecular forces of attraction.

Question 11

Solids and liquids are referred to as the

Answer 11

condensed phases.

Question 12

Extensive properties: dependent of the

Answer 12

quantity of material in the system. mass,volume,total energy.

Question 13

Intensive properties: independent of the

Answer 13

quantity of material. density, pressure, temperature

Question 14

A tiny particle of a chemical element is called

Answer 14

an atom

Question 15

is a special type of homogeneous mixture composed of two or more substances

Answer 15

Solution

Question 16

is matter which has a specific composition and specific properties. Every pure element is a substance. Every pure compound is a substance

Answer 16

Substance

Question 17

cannot be decomposed into simpler substances by chemical changes

Answer 17

Elements

Question 18

can be decomposed into simpler substances by chemical changes

Answer 18

Compounds

Question 19

Variable composition. Components retain their characteristic properties

Answer 19

Mixtures

Question 20

components are indistinguishable; have same composition (e.g. solutions, alloys).

Answer 20

Homogeneous mixtures

Question 21

components are distinguishable; do not have same
composition (e.g. muddy river water)

Answer 21

Heterogeneous mixtures

Question 22

liquid to solid

Answer 22

freezingpoint

Question 23

liquid to gas

Answer 23

boiling point

Question 24

solid to liquid

Answer 24

melting point

Question 25

liquid changes to a gas gradually at temperatures below the boiling point

Answer 25

evaporation (vaporization)

Question 26

when a gas changes to a liquid

Answer 26

condensation

Question 27

solid changes directly into a gas without going through the liquid phase Ex: dry ice

Answer 27

sublimation

Question 28

gas or vapor changes directly into solid without changing to a liquid Ex: frost

Answer 28

deposition

Question 29

forces that hold one atom to another in a compound

Answer 29

bond

Question 30

Bond breaking is

Answer 30

endothermic

Question 31

Bond making is

Answer 31

exothermic

Question 32

To make bonds causes

Answer 32

a release of energy.

Question 33

The energy stored in a bond is

Answer 33

potential

Question 34

There are four types of bonds

Answer 34

(ionic , covalent , coordinate and metallic bond )

Question 35

Exothermic Change: A + B → C + D + energy

Answer 35

Energy is released

Question 36

Endothermic Change: A + B + energy → C + D

Answer 36

Energy is absorbed