Chemistry 8

Question 1

1st Atomic theory

Answer 1

Solid sphere 460-370BCE, Democrites

Question 2

2nd Atomic theory

Answer 2

Plum pudding model 1904, J.J. Thompson

Question 3

3rd Atomic theory

Answer 3

Nuclear model 1911, Rutherford (gold foil test)

Question 4

4th Atomic theory

Answer 4

Planetary model 1913, Bohr

Question 5

Current atomic theory

Answer 5

Quantum model 1926-now, Schrödinger

Question 6

Groups 1, 2 and 3 of the periodic table…

Answer 6

give away electrons

Question 7

Groups 5, 6 and 7 of the periodic table…

Answer 7

take electrons

Question 8

Group 4 of the periodic table…

Answer 8

shares electrons

Question 9

Noble gases are group…

Answer 9

8

Question 10

Are noble gases reactive?

Answer 10

no

Question 11

Halogens are group…

Answer 11

7

Question 12

What happens as you move up the group of halogens?

Answer 12

They get more reactive

Question 13

What happens as you move up group 1?

Answer 13

They get less reactive

Question 14

Metals between groups 2 and 3 are…

Answer 14

transition metals

Question 15

Groups 1, 2 and 3 have a ___ charge as ions

Answer 15

positive

Question 16

Groups 5, 6 and 7 have a ___ charge as ions

Answer 16

negative

Question 17

What is ionic bonding

Answer 17

Bonding between a metal and non-metal

Question 18

What is covalent bonding

Answer 18

Bonding between two non-metals

Question 19

Name 3 acids

Answer 19

HCl (Hydrochloric acid), HNO3 (Nitric Acid), H2SO4 (Sulfuric acid)

Question 20

Name 3 alkalis

Answer 20

Ca(OH)2 (limewater), NaOH (Sodium Hydroxide), Mg(OH)2 (Magnesium hydroxide)

Question 21

Hydrochloric acid makes

Answer 21

chloride salt

Question 22

Nitric acid makes

Answer 22

nitrate salt

Question 23

Sulfuric acid makes

Answer 23

Sulfate salt

Question 24

Acid + Alkali →

Answer 24

Salt + Water

Question 25

Acid + metal oxide →

Answer 25

Salt + Water

Question 26

Acid + metal carbonate →

Answer 26

Salt + Water + carbon dioxide

Question 27

Acid + metal hydroxide →

Answer 27

Salt + Water

Question 28

Acid + metal →

Answer 28

Salt + Hydrogen

Question 29

How do you test for hydrogen?

Answer 29

Squeaky pop test

Question 30

How do you test for carbon dioxide?

Answer 30

Limewater goes cloudy

Question 31

Endothermic

Answer 31

a reaction in which heat is absorbed

Question 32

Exothermic

Answer 32

a chemical reaction that produces heat

Question 33

What is the chemical reaction used in a cold pack?

Answer 33

NH4NO3 (s) + water = NH4NO3 (aq)

Question 34

What is the chemical reaction used in a heat pack

Answer 34

CaCl2 (s) + water = CaCl2 (aq)

Question 35

Atomic number

Answer 35

number of protons

Question 36

Mass number

Answer 36

number of protons and neutrons

Question 37

Ion

Answer 37

An atom or small group of atoms that has an electrical charge because it has gained or lost an electron

Question 38

Acid

Answer 38

Substance that releases hydrogen ions into liquid solutions

Question 39

Alkali

Answer 39

A base dissolved in water that that releases OH ions into liquid solutions

Question 40

Salt

Answer 40

A neutral substance

Question 41

Neutralisation

Answer 41

The reaction between an acid and a base, which produces a salt and water

Question 42

Chemical change

Answer 42

A change where a new substance is formed, bonds between atoms are broken, new bonds are formed, and atoms are rearranged

Question 43

Physical change

Answer 43

A change in the appearance of a substance without a new substance being formed

Question 44

Chemical bond

Answer 44

The join between two atoms that keep them connected

Question 45

Respiration

Answer 45

A chemical process in which energy is produced in the body from food using oxygen

Question 46

How do ionic bonds happen?

Answer 46

metal gives electrons and non-metal takes electrons

Question 47

How do covalent bonds happen?

Answer 47

They share electrons so that one can complete it's outer shell