Y9 Units 1-3 revision

Aluminium has 13 electrons, how are they arranged?

• 2, 8, 2

• 2, 8, 3

• 2, 7, 4

• 3, 10, 0

An element with 7 protons and 8 neutrons. Calculate the atomic number and the mass number?

• Atomic number: 6, Mass number: 14.

• Atomic number: 7, Mass number: 15.

• Atomic number: 8, Mass number: 16.

• Atomic number: 7, Mass number: 14.

Atoms have no overall charge because....

• They have equal numbers of protons and electrons.

• They have more neutrons than protons.

• They have an unequal number of protons and electrons.

• They are made up of neutral particles only.

What is the difference between Carbon-12 and Carbon-14?

• Carbon-12 has 6 protons and 6 neutrons, while Carbon-14 has 6 protons and 8 neutrons.

• Carbon-12 has 8 protons and 6 neutrons, while Carbon-14 has 6 protons and 6 neutrons.

• Carbon-12 has 6 protons and 8 neutrons, while Carbon-14 has 8 protons and 6 neutrons.

• Carbon-12 has 6 protons and 6 neutrons, while Carbon-14 has 8 protons and 8 neutrons.

Calculate the relative formula mass of NO₂

N=14

O=16

• 42

• 44

• 46

• 48

If 24g of magnesium reacts with 16g of oxygen, how much magnesium oxide is made?

• 32g

• 40g

• 48g

• 56g

An atom with 29 protons, 36 neutrons, and 29 electrons. Calculate the atomic number and the mass number?

• Atomic number: 28, Mass number: 65

• Atomic number: 29, Mass number: 64

• Atomic number: 29, Mass number: 65

• Atomic number: 30, Mass number: 66

The charge of an electron is....

• 0

• +1

• -1

• -2

The term conservation of mass means:

• The mass of the reactants must equal the mass of the products.

• The total energy of a system remains constant.

• The mass can be created or destroyed in a chemical reaction.

• The volume of the reactants must equal the volume of the products.

Relative formula mass of Fe₂O₃

• 150

• 160

• 170

• 180