Quantitative chemistry(chemistry maths)

Question 1

On the periodic table, what is the number above the element?

Answer 1

Mass

Question 2

On the periodic table, what is the number below the element?

Answer 2

atomic(proton)

Question 3

What is an isotope?

Answer 3

An atom of the same element that have the same number of protons and electrons but diff number of neutrons.

Question 4

What is the relative atomic mass(Ar)?

Answer 4

An average value for the isotopes of that element.

Question 5

How do you work out the relative atomic mass(Ar)?

Answer 5

Sum of the relative atomic masses of the atoms in that formula.

Question 6

1 mole of a substance is simply the _ _ _ _ _ _ _ mass of a _ _ _ _ _ _ _ _ _ in _ _ _ _ _.

Answer 6

Formula, compound, grams.

Question 7

A _ _ _ _ _ _ _ _ _ formula shows us the TOTAL number of each type of atom in a compound.

Answer 7

Molecular.

Question 8

An _ _ _ _ _ _ _ _ formula shows the simplest whole number ratio of each type of atom in a compound.

Answer 8

Empirical.

Question 9

How do you calculate the Empirical formula?

Answer 9

EMMR(element, mass, moles, ratio)

Question 10

What is a reversible reaction?

Answer 10

Reactions that can go forwards and backwards.

Question 11

How do you work out the ‘percentage yield’?

Answer 11

What you made divided by what you SHOULD make all times by 100.

Question 12

Name 4 reasons why we don’t get 100% yield.

Answer 12

• Some products are lost during separation process.
• The reaction may be reversible.
• May react in different ways.
• May not fully react.