C4 Chemical Calculations

Question 1

What are state symbols

Answer 1

To give extra information on the state of the reactants/products

Question 2

Relation to mass of products and reactants

Answer 2

The total mass of the products formed in a reaction is equal to the total mass of reactants

Question 3

What state symbol is s

Answer 3

Solid

Question 4

What state symbol is g

Answer 4

Gas

Question 5

What state symbol is l

Answer 5

Liquid

Question 6

What state symbol is aq

Answer 6

Aqueous solution-substances dissolved in water

Question 7

Why do all symbol equations have to be balanced

Answer 7

Due to the conservation of mass (no atoms can be created or destroyed)

Question 8

KNO3—>KNO2+O2 Balanced

Answer 8

2KNO3—>2KNO2+O2

Question 9

Calculation for relative formula mass

Answer 9

Atomic mass x number of atoms

Question 10

How do you find the percentage mass of an element in a compound

Answer 10

Atomic mass x number of atoms of that element/atomic mass x 100

Question 11

What is a mole

Answer 11

The name given to an amount of a substance

Question 12

What is avogadros number

Answer 12

6.02x10^23

Question 13

Concentration equation when finding the dm^3

Answer 13

Amount of solute (g)/volume of solution (dm^3)

Question 14

What is the calculation for numbers of moles

Answer 14

Mass in grams/relative mass

Question 15

Concentration equation when finding cm^3

Answer 15

Amount of solute (g)/volume of solution (cm^3) x1000