CH2&3

Question 1

Definition of Matter

Answer 1

Anything that has mass and occupies space

Question 2

Definition of Melting Point

Answer 2

Constant temperature when a substance change from solid to liquid at a specific pressure

Question 3

Definition of Boiling point

Answer 3

Constant temperature when a substance change from liquid to gas at a specific pressure

Question 4

Definition of Proton Number

Answer 4

Number of proton in a nucleus of an atom

Question 5

Definition of Nucleon number

Answer 5

Total number of proton and neutron in a nucleus of an atom

Question 6

Definition of Isotope

Answer 6

Atoms of the same elements that have the same Proton Number but different number of neutrons

Question 7

Definition of atom

Answer 7

The smallest neutral particle of an element that participates in a chemical reaction.

Question 8

Definition of molecule

Answer 8

Neutral Particle that consist of 2 or more atoms of the same or different elements that have been bonded chemically

Question 9

Definition of Elements

Answer 9

Substance that consists of only one atom

Question 10

Definition of Compound

Answer 10

Substance that consists of 2 or more different elements that are chemically bonded together

Question 11

Substances that undergoes Sublimation

Answer 11

ammonium chloride, iodine, camphor, naphthalene, dry ice.

Question 12

Why temperature remain constant during a phase of Heating

Answer 12

Heat energy absorbed by particles are used to overcome forces of attraction between particles so solid can change to liquid

Question 13

Why temperature remain constant during a phase of Cooling

Answer 13

Heat energy lost/releases by particles to surrounding is balanced by the heat energy releases when particles attract each other to form solid

Question 14

Development of Atomic structure model

Answer 14

Dalton-Atom
Thompson-Electron
Rutherford-Proton
Bohr-Shells
Chadwick-neutrons

Question 15

3 Similarities of Isotopes

Answer 15

Chemical Properties
Proton Number
Elements

Question 16

2 Differences of isotopes

Answer 16

Number or neutron
Physical properties

Question 17

Use of Iodine 131

Answer 17

Measure rate of Iodine absorption by Thyroid Gland

Question 18

Use of Sodium-14

Answer 18

Detect underground pipes leakage

Question 19

Uses of Cobalt-60

Answer 19

Kill Cancer cells

Question 20

Use of carbon-14

Answer 20

estimate age of artifacts

Question 21

Use of Phosphorus-32

Answer 21

study plant metabolism

Question 22

Definition of Relative atomic mass

Answer 22

Average mass of one atom of the element when compared to 1/12 of mass of one carbon-12 atom

Question 23

Definition of Relative Molecular Mass

Answer 23

Average mass of the molecule when compared to 1/12 of mass of one carbon-12 atom

Question 24

Definition of Molar Mass

Answer 24

Mass of 1 mol of a substance

Question 25

Definition of Molar Volume

Answer 25

Volume occupied by 1 mol of a gas

Question 26

Definition of valence shell

Answer 26

Outermost shell that is filled with electrons of an atom

Question 27

Definition of valence electron

Answer 27

Electrons in the valence shell of an atom

Question 28

Definition of Empirical Formula

Answer 28

Chemical formula that shows the simplest whole number ratio of number of atoms of each elements found in a molecule of a compound

Question 29

Definition of Molecular Formula

Answer 29

Chemical formula that shows the actual number of atoms of each element found in a molecule of a compound