Foundations in chemistry

Question 1

What is meant by an isotope

Answer 1

Atoms of the same element with the same number of protons but different numbers of neutrons

Question 2

What is meant by Relative Isotopic Mass?

Answer 2

The mass of an atom of an isotope compared with a twelfth of the mass of an atom of Carbon-12

Question 3

What is meant by relative atomic mass?

Answer 3

The weighted mean mass of an atom compared with a twelfth of the mass of the atom of Carbon-12.

Question 4

What is the equation to calculate moles?

Answer 4

n=m/Mr

Question 5

What is the equation to calculate the amount of substance?

Answer 5

n=m/M

Question 6

What equation links volume and concentration with moles?

Answer 6

n=cXv/1000

Question 7

What is a standard solution?

Answer 7

A solution with a known concentration

Question 8

What is the equation to calculate gas volumes?

Answer 8

n=v/24

Question 9

What is meant by ‘mole’?

Answer 9

The amount of any substance containing the same number of particles as there are in 12g of the Carbon-12 isotope.

Question 10

What are some differences between isotopes of the same element?

Answer 10

1. different neutron number
2. different physical properties