Module 2

Question 1

What is the atomic number?

Answer 1

• the number of protons

Question 2

What is the mass number?

Answer 2

• the total number of protons and neutrons

Question 2

What are isotopes?

Answer 2

• atoms of the same element with the same number of protons but different number of neutrons

Question 3

What is the relative atomic mass?

Answer 3

• the weighted mean mass of an atom compared with 1/12th mass of an atom of carbon-12

Question 4

What is the relative isotopic mass?

Answer 4

• the mass of an isotope compared with 1/12th mass of an atom of carbon-12

Question 5

What is an acid?

Answer 5

• releases H+ ions in aqueous solutions, proton donor

Question 5

What is a strong acid?

Answer 5

• completely dissociates when dissolved in water

Question 6

What is a weak acid?

Answer 6

• partially dissociates

Question 7

What is a base?

Answer 7

• a substance which neutralises acids, proton acceptor

Question 8

What is an alkali?

Answer 8

• a soluble base that releases OH- ions in aqueous solution

Question 9

What is a standard solution?

Answer 9

• a solution of known concentration

Question 10

What is an atomic orbital?

Answer 10

• a region around the nucleus that can hold up to 2 electrons with opposite spins

Question 11

What is an ionic bond?

Answer 11

• a strong electrostatic force of attraction between the oppositely charged ions

Question 12

What is a covalent bond?

Answer 12

• a shared pair of electrons between atoms

Question 13

What is electronegativity?

Answer 13

• the ability of an atom to attract a pair of electrons in a covalent bond