Quantitive Chemistry

Question 1

100g of Calcium carbonate turns into 56g of calcium oxide and carbon dioxide.

How many grams of carbon dioxide has been produced?

Answer 1

100g - 56g = 44g

Question 2

Balance the equation

Cu + O2 —> CuO

Answer 2

Add 2 in front of Cu and 2 in front of CuO

2Cu + O2 —-> 2CuO

Question 3

What is relative formula mass?

Answer 3

The sum of the relative atomic masses of the elements in a chemical formula.

Question 4

What is the symbol for relative formula mass?

Answer 4

Mr

Question 5

Sum of the RFM of reactants = Sum of the RFM of products

True or False?

Answer 5

True

Question 6

What is the equation linking mass, moles, relative formula mass?

Answer 6

Mass = moles(mol) x Mr(g/mol)

Question 7

1 mole = RFM of a substance

True or false?

Answer 7

True

Question 8

How many moles in 88g of CO2

The relative formula for CO2 = 44

Answer 8

Moles = Mass / Mr
88/44 = 2 moles

Question 9

What is the equation that links, mass, volume, concentration?

Answer 9

Mass = volume(dm3) x Concentration(g/dm3)

Question 10

What is concentration?

Answer 10

A measurement of how much of a soluble substance is dissolved in a solute.

(You dont have to know this)