Topic 3: Stoichiometry

Question 1

Tell me the formula of ammonia

Answer 1

NH3

Question 2

Tell me the formula of calcium hydroxide

Answer 2

Ca(OH)2

Question 3

Tell me the formula of carbon dioxide

Answer 3

CO2

Question 4

Tell me the formula of copper sulfate

Answer 4

CuSO4

Question 5

Tell me the formula of ethanol (alcohol)

Answer 5

C2H5OH

Question 6

Tell me the formula of glucose.

Answer 6

C6H12O6

Question 7

Tell me the formula of hydrochloric acid.

Answer 7

HCl

Question 8

Tell me the formula of nitric acid.

Answer 8

HNO3

Question 9

Tell me the formula of sodium carbonate

Answer 9

Na2CO3

Question 10

Tell me the formula of sodium hydroxide

Answer 10

NaOH

Question 11

Tell the formula of sulfuric acid

Answer 11

H2SO4

Question 12

Define molecular formula.

Answer 12

The number of atoms of each element in one molecule of a compound

Question 13

Define empirical formula

Answer 13

The simplest whole number ratio of atoms of each element in the compound

Question 14

Draw the formula diagram of hydrogen

Answer 14

Question 15

Draw the formula diagram of carbon dioxide

Answer 15

Question 16

Draw the formula diagram of water.

Answer 16

Question 17

Draw the formula diagram of ammonia

Answer 17

Question 18

Write the ionic formula of hydrogen.

Answer 18

H+

Question 19

Write the ionic formula of lithium

Answer 19

Li+

Question 20

Write the ionic formula of sodium

Answer 20

Na+

Question 21

Write the ionic formula of potassium

Answer 21

K+

Question 22

Write the ionic formula of silver

Answer 22

Ag+

Question 23

Write the ionic formula of ammonium

Answer 23

NH4+

Question 24

Write the ionic formula of magnesium

Answer 24

Mg2+

Question 25

Write the ionic formula of iron(II)

Answer 25

Fe2+

Question 26

Write the ionic formula of calcium

Answer 26

Ca2+

Question 27

Write the ionic formula of zinc

Answer 27

Zn2+

Question 28

Write the ionic formula of lead

Answer 28

Pb2+

Question 29

Write the ionic formula of copper

Answer 29

Cu2+

Question 30

Write the ionic formula of barium

Answer 30

Ba2+

Question 31

Write the chemical formula of aluminium

Answer 31

Al3+

Question 32

Write the ionic formula of iron (III)

Answer 32

Fe3+

Question 33

Write the ionic formula of phosphate

Answer 33

PO43-

Question 34

Write the ionic formula of oxygen

Answer 34

O2-

Question 35

Write the ionic formula of carbonate

Answer 35

CO3-

Question 36

Write the ionic formula of sulfate

Answer 36

SO42-

Question 37

Write the ionic formula of sulfide

Answer 37

S2-

Question 38

Write the ionic formula of fluoride

Answer 38

F-

Question 39

Write the ionic formula of chloride

Answer 39

Cl-

Question 40

Write the ionic formula of bromide

Answer 40

Br-

Question 41

Write the formula of iodide.

Answer 41

I-

Question 42

Write the formula of nitrate.

Answer 42

NO3-

Question 43

Write the formula of hydroxide

Answer 43

OH-

Question 44

Write the formula of hydrogen carbonate

Answer 44

HCO3-

Question 45

Write the ionic equation of the reaction between AgNO3 and NaCl

Answer 45

AgNO3(aq) + NaCl (aq) —> AgCl(s) + NaNO3(aq)

Question 46

What is the mole.

Answer 46

The mole is the unit for the amount of substance

Question 47

Write the avogardo’s constant.

Answer 47

6.02 x 10^23

Question 48

Write the formula for finding the number of moles of a solid.

Answer 48

Mass x Mr = moles

Question 49

Write the formula to find the number of moles of gas at RTP

Answer 49

Volume of gas (dm3) x 24

Question 50

Answer 50

Question 51

What is a limiting reactant?

Answer 51

The reactant that is used up first

Question 52

Answer 52

Question 53

How do you calculate the concentration of a substance.

Answer 53

Mass/vol –> g/dm3

Question 54

Answer 54

Question 55

Answer 55

Question 56

Answer 56

Question 57

How do you find percentage yield?

Answer 57

Question 58

How do you calculate percentage purity?

Answer 58