Subject chemistry

The atomic number of oxygen is:

• 1 6
• 2 2
• 3 16
• 4 8

The molar mass of carbon dioxide (C = 12, O = 16) is:

• 1 44 g/mol
• 2 28 g/mol
• 3 32 g/mol
• 4 56 g/mol

A solution with a pH of 3 is:

• 1 Basic
• 2 Salty
• 3 Acidic
• 4 Neutral

The number of moles in 11 g of carbon dioxide (molar mass 44 g/mol) is:

• 1 0.25
• 2 4
• 3 0.5
• 4 11

The bonds between the atoms in a water molecule are:

• 1 Hydrogen only
• 2 Covalent
• 3 Metallic
• 4 Ionic

The metals in Group 1 of the periodic table are called:

• 1 Alkaline earth metals
• 2 Halogens
• 3 Noble gases
• 4 Alkali metals

The chemical formula of sulfuric acid is:

• 1 H₂SO₄
• 2 HNO₃
• 3 HCl
• 4 H₂CO₃

The chemical formula of methane is:

• 1 CH₄
• 2 C₂H₄
• 3 C₂H₆
• 4 CO₂

The number of electrons in a chloride ion (Cl⁻, atomic number 17) is:

• 1 17
• 2 18
• 3 19
• 4 16

Sodium hydroxide is:

• 1 A salt only
• 2 An acid
• 3 A base
• 4 A gas

The oxidation number of sulfur in SO₂ is:

• 1 +4
• 2 +6
• 3 −4
• 4 +2

When the temperature of a reaction is raised, its rate usually:

• 1 Stops
• 2 Stays the same
• 3 Decreases
• 4 Increases

The atomic number of nitrogen is:

• 1 7
• 2 6
• 3 14
• 4 8

The molar mass of water (H = 1, O = 16) is:

• 1 16 g/mol
• 2 18 g/mol
• 3 34 g/mol
• 4 10 g/mol

The number of moles in 22 g of carbon dioxide (molar mass 44 g/mol) is:

• 1 1
• 2 22
• 3 2
• 4 0.5

A solution with a pH of 11 is:

• 1 Basic
• 2 Salty
• 3 Neutral
• 4 Acidic

The bond in sodium chloride is:

• 1 Ionic
• 2 Metallic
• 3 Covalent
• 4 Hydrogen

The elements of Group 18 are called:

• 1 Noble gases
• 2 Halogens
• 3 Alkali metals
• 4 Transition metals

The chemical formula of sodium carbonate is:

• 1 Na₂CO₃
• 2 Na₂CO
• 3 NaHCO₃
• 4 NaCO₃

The chemical formula of ethane is:

• 1 C₂H₆
• 2 C₃H₈
• 3 C₂H₄
• 4 CH₄

The oxidation number of chlorine in sodium chloride is:

• 1 −1
• 2 −2
• 3 +1
• 4 0

The number of neutrons in a carbon-14 atom (atomic number 6) is:

• 1 8
• 2 20
• 3 14
• 4 6

Which gas is produced when zinc reacts with dilute hydrochloric acid?

• 1 Hydrogen
• 2 Carbon dioxide
• 3 Oxygen
• 4 Chlorine

Rusting of iron needs:

• 1 Oxygen only
• 2 Oxygen and water
• 3 Water only
• 4 Nitrogen