Topic 3 - Quantative Chemistry

Question 1

What is the law of conservation of mass?

Answer 1

It states that no atoms are lost of made during a chemical reaction so the mass of the products is the mass of the reactants

Question 2

What is relative formula mass?

Answer 2

The sum of all the relative atomic masses of the atoms in a formula

Question 3

What is avogadros constant?

Answer 3

6.02x10^23 - the number of atoms in a mole of a substance

Question 4

What is the equation for moles in solid?

Answer 4

Moles = mass/atomic mass

Question 5

What is the equation for moles in liquid?

Answer 5

Moles = concentration x volume

Question 6

How do you go from dm3 to cm3?

Answer 6

X1000

Question 7

How do you go from cm3 to dm3?

Answer 7

Divide by 1000

Question 8

What is the equation to find volume of a gas?

Answer 8

Volume in dm3 = moles x 24

Question 9

What is the equation for atom economy?

Answer 9

Relative mass of desired product / relative mass of all reactants x100

Question 10

Why is considering atom economy important?

Answer 10

Raw materials are expensive
Less sustainable to make tiny products
Lots of waste

Question 11

What factors determine how profitable a reaction is?

Answer 11

Yield
Cost of materials
Equilibrium
rate
Cost to maintain correct conditions

Question 12

What is the equation for percentage yield?

Answer 12

Actual yield / theoretical yield x 100 = percentage yield