Science 10 - Chemistry 2

Question 1

On their own how many ions of phosphorus are there?

Answer 1

4

Question 2

On its own how many ions are single sulfur?

Answer 2

8

Question 3

On its own how many ions does bromine have?

Answer 3

2 (diatomic)

Question 4

On its own how many ions does chlorine have?

Answer 4

2 (diatomic)

Question 5

On its own how many ions does fluorine have?

Answer 5

2 (diatomic)

Question 6

On its own how many ions does oxygen have?

Answer 6

2 (diatomic)

Question 7

On its own how many ions does nitrogen have?

Answer 7

2 (diatomic)

Question 8

On its own how many ions does hydrogen have?

Answer 8

2 (diatomic)

Question 9

what is formed from the reaction of a pricipitate

Answer 9

solid

Question 10

What is it called when something is very soluable

Answer 10

aqueous

Question 11

solubility definition

Answer 11

dissolves in water

Question 12

what is something that is slightly soluble called

Answer 12

solid (precipitate)

Question 13

What is a chemical reaction

Answer 13

occurs when one or more substances change to form new substances

Question 14

what are reactants

Answer 14

are the substances which undergo a chemical reaction

Question 15

what are products

Answer 15

the substances that are formed from a chemical reaction

Question 16

what is a formation reaction

Answer 16

reactant + reactant = product (A+B=AB)

Question 17

decomposition reaction define

Answer 17

compound breaks down into elements (AB=A+B)

Question 18

Single replacement define

Answer 18

element +compound = element + compound (AB + C = AC + B)

Question 19

double replacement define

Answer 19

compound + compound = Compound + compound (AB + CD = AD + CB)

Question 20

What rwo elements are liquid?

Answer 20

mercury and bromine

Question 21

molecular compounds are usually gas t or f

Answer 21

t

Question 22

is boiling water a physical or chemical change

Answer 22

physical

Question 23

what is the evidence of a chemical change?

Answer 23

change in energy, formation of a precipitate, formation of gas(bubbles), change is colour, change in odour

Question 24

why is water weird

Answer 24

• water expands when its freezes where other substances shrink
• it is polar (one positive end and one negative)
• it has a bent shape which is from its polarity
• polarity causes hydrogen bonds

Question 25

when you need to get atoms from moles do you multiply or devide?

Answer 25

multiply by 6.02 x 10^23

Question 26

when you need to get moles from atoms do you devide or multiply?

Answer 26

devide by 6.02 x 10^23