Quantitive

Question 1

LiBr name

Answer 1

lithium bromide

Question 2

ZnSO4 name

Answer 2

zinc sulfATE

Question 3

Fe(NO3)2 name

Answer 3

iron nitrate

Question 4

magnesium oxide formula

Answer 4

MgO

Question 5

ammonium nittrate formula

Answer 5

NH4NO3

Question 6

calcium hydroxide formula

Answer 6

Ca(OH)2

Question 7

balance Fe + 02 -> Fe2O3

Answer 7

4Fe + 3O2 -> 2Fe2O3

Question 8

balance Xe + F2 -> XeF6

Answer 8

Xe + 3F2 -> XeF6

Question 9

balance C3H8 + SO2 -> CO2 + H20

Answer 9

C3H8 + SO2 -> 3CO2 + 4H20

Question 10

3a

Answer 10

7 + 35.5 = 42.5

Question 11

3b

Answer 11

1 + 14+ 48 = 63

Question 12

3c

Answer 12

54 + (3x(32+64) = 342

Question 13

whats the Mr of MgSO4

Answer 13

120

Question 14

% of Mg in MgSO4

Answer 14

24/120 x 100 = 20%

Question 15

% of S in MgSO4

Answer 15

32/120 x 100 = 27%

Question 16

% of O IN MgSO4

Answer 16

64/120 x 100 = 53%

Question 17

5a

Answer 17

(80 + 76 + 79)/3 = 78.3cmcubed

Question 18

5b

Answer 18

range = 80-67=4
uncertainty = 4/2
78.3 ±2cmcubed

Question 19

define isotopes

Answer 19

atoms of the same element with samenumber of protons different numbers of neutrons

Question 20

6b

Answer 20

both isotopes have 8 protons
both isotopes have 8 electrons
isotope 18 was 10 neutrons
isotope 16 has 8 neutrons

Question 21

7a

Answer 21

the average mass of an atom compared to 1/12 of a carbon - 12 atom

Question 22

7b

Answer 22

(72/100 x 85) + (28/100 x 87)
= 61.2 + 24.36
= 85.6

Question 23

8

Answer 23

mass/mr = 50/200
= 0.25 moles

Question 24

9

Answer 24

mass = moles x mr
= 0.80 x 79.5
=63.6g

Question 25

why does it appear the gas to have decreased in mass

Answer 25

carbon dioxide was produced which is a gas sp the initial solid decreased in mass

Question 26

10ii

Answer 26

the reaction was complete

Question 27

10bi

Answer 27

oxyegn reacted with magneisum which formed magnesium oxide

Question 28

11

Answer 28

32/72 = 0.44
56 x 0.44
= 24.9g

Question 29

solute definition

Answer 29

substance that will dissolve in a liquid

Question 30

solvent definition

Answer 30

a liquid in which the solute will dissolve in

Question 31

solution definition

Answer 31

a mixture of the solute and solvent

Question 32

12b

Answer 32

conc = mass/volume
24/0.2
= 120g/dmcubed