Chemistry

Question 1

Ammonia

Answer 1

NH3

Question 2

Methane

Answer 2

CH4

Question 3

Ozone

Answer 3

O3

Question 4

Hydrogen Peroxide

Answer 4

H2O2

Question 5

Prefixes

Answer 5

Mono, di, tri, tetra, penta, hexa

Question 6

Metal + water

Answer 6

Base + H2

Question 7

Metal + acid

Answer 7

Ionic compound + H2

Question 8

Neutralization reaction

Answer 8

Acid + base = salt + water

Question 9

Combustion reaction

Answer 9

CxHy + O2 = CO2 + H2O

Question 10

Exothermic

Answer 10

Reactants = products + heat

Question 11

Endothermic

Answer 11

Reactants + heat = products

Question 12

Water

Answer 12

H2O

Question 13

Compound: def

Answer 13

a pure substance composed of 2 or more elements in a fixed ratio

Question 14

What do the numbers on ionic compound formula tell you?

Answer 14

How many atoms of each element are needed to make the compound neutral

Question 15

Molecule

Answer 15

a particle in which atoms are joined by covalent bonds

Question 16

Covalent bond: how?

Answer 16

• when 2 non-metals bond with each other, both nuclei form strong attractions for the other’s electrons
• neither atom attracts electrons strongly enough to pull it away
• result: sharing

Question 17

___________ arrow _______

Answer 17

Left = reactants
Right = products

Question 18

What is the law of conservation of mass?

Answer 18

In any given chemical reaction, the total mass of the reactants equals the total mass of the products

Question 19

Why must we balance chemical equations?

Answer 19

• during chemical reaction, atoms in reactant molecules rearrange to form products
• therefore all atoms that existed in reactants are still present in products because atoms can’t be created or destroyed
• to be accurate, we must show that there are equal # of each atom before and after chemical reaction has taken place

Question 20

Oxyacids

Answer 20

• Hydro _________(polyatomic acids)

Question 21

What does pH scale indicate? What does neutral mean?

Answer 21

• concentration of hydroxide or hydrogen ions

- neutral means that the concentrations are equal and balance each other out

Question 22

bonds?

Answer 22

outer shells collide to have a more stable electron arrangement.

Question 23

Why don’t you reduce in molecular?

Answer 23

• ionic: ratio of elements in compound

- molecular: actual # of each atom in molecule (change it and it will be different molecule)

Question 24

How to neutralize an acid?

Answer 24

add indicator and add base until indicator changes colour

Question 25

Metals characteristics

Answer 25

- solid - shiny - conductor - malleable

Question 26

Non-metals characteristics

Answer 26

- solid/liquid/gas - dull - not conductor - brittle, not ductile

Question 27

Reactivity trends?

Answer 27

- Metals: as you go down and left, electron is further from nucleus which means less energy to lose electron - Nonmetals: stronger P charge, more attractive

Question 28

Period #

Answer 28

of orbits

Question 29

Group #

Answer 29

of valence electrons

Question 30

Ionic bond

Answer 30

Attraction between metal cation and non-metal anion

Question 31

Acids properties

Answer 31

- corrosive - soluble in water - sour - turn litmus paper red - good conductors when dissolves

Question 32

Bases properties

Answer 32

- corrosive - soluble in water - bitter - slippery - turn litmus paper blue - good conductors when dissolved in water