Chemical Reactions & Stoichiometry

Question 1

What is one mole?

Answer 1

6,022 x 10^23

Question 2

What is Avogadro’s number?

Answer 2

1 mole = 6.022 x10^23

Question 3

What are the units of the equation: M=m/n ?

Answer 3

g/mol= g/mol

Question 4

What are the components of M=m/n

Answer 4

Molar mass = sample mass / number of moles

Question 5

What does Ar start for?

Answer 5

Relative atomic mass

Question 6

What is the molar mass of oxygen?

Answer 6

16

Question 7

What is the molar mass of hydrogen?

Answer 7

1

Question 8

What is the molar mass of carbon?

Answer 8

12

Question 9

What ar the units of C = n/V

Answer 9

Moles (n) / litre (L)

Question 10

What are the components of C=n/V

Answer 10

Concertration = number of moles/ volume

Question 11

What is 1 litere the same as?

Answer 11

Dm^3

Question 12

What are the components of c1V1=c2V2

Answer 12

Initial concentration x initial volume = final concentration x final volume

Question 13

What is the molecular formula & empirical formula of benzene

Answer 13

Molecular: C6h6
Emerperical: CH

Question 14

What does the empirical formula tell us?

Answer 14

The ratio between the elements in the compound

Question 15

Formula for percentage yield

Answer 15

Percentage yield = ( actual yield / theoretical yield ) x 100%

Question 16

Formula for ideal gas law

Answer 16

Pv=nrt

Question 17

Conversion of Celsius to Kelvin

Answer 17

Add 273 as 0c= 273k

Question 18

What is a synthesis/ combination reaction?

Answer 18

Complex compound formed from simpler inputs
X+ y→ xy

Question 19

What is a decomposition reaction?

Answer 19

Compound is broke into simpler compounds/atoms
Xy → x+ y

Question 20

What is a combustion reaction?

Answer 20

Compound with C, h & sometimes O (organisation compound) reacts with O2 to form H2O & Co 2

Question 21

What is formed during a combustion reactions?

Answer 21

H20 & co2

Question 22

What is a displacement/single replacement reaction?

Answer 22

More reactive element displace less reactive elements
X+ yz → xy+ z if x is more reactive than z

Question 23

What is a exchange/ double replacement reaction?

Answer 23

2 replacements
Ax + ay → ay + bx

Question 24

Formula for rate of reaction

Answer 24

Google answer

Question 25

What lowers activation energy

Answer 25

Catalyst

Question 26

Is the catalyst consumes by the reaction?

Answer 26

No

Question 27

What is a disproportionation reaction?

Answer 27

A reaction where a compound undergoes both oxidation & reduction

Question 28

What is the change in enthalpy?

Answer 28

The heat that is transferred under constant pressure

Question 29

What is an endothermic reaction?

Answer 29

When energy goes into the system & change in enthalpy is positive

Question 30

What is an exothermic reaction?

Answer 30

When energy goes into the surroundings & change in enthalpy is negative

Question 31

What is the unit of rate of reaction?

Answer 31

M/s (molar/s)

Question 32

Rate of reaction =?

Answer 32

Rate = change in concentration / change in time

Question 33

What is the only thing that can change an equilibrium constant?

Answer 33

Increase or decrease in temperature

Question 34

What is a disproportionation reaction?

Answer 34

A reaction where the same element is both oxidised & reduced