OCR 2019 Paper 2

Sodium is in Group 2 of the Periodic Table.

Sodium is in Period 2 of the Periodic Table.

Sodium is in Period 3 of the Periodic Table.

Sodium is in Group 3 of the Periodic Table.

Simple molecules have weak covalent bonds between atoms.

Simple molecules have weak intermolecular forces between atoms.

Simple molecules have weak ionic bonds between the molecules.

Simple molecules have weak intermolecular forces between the molecules.

In order of decreasing atomic mass and similar physical properties.

In order of increasing atomic number and similar physical properties.

In order of decreasing atomic number and similar chemical properties.

In order of increasing atomic mass and similar chemical properties.

R_f = \frac{ \text{distance travelled by solvent} }{ \text{distance travelled by substance} }

R_f = \frac{ \text{distance travelled by substance} }{ \text{distance travelled by solvent} }

R_f = \frac{ \text{distance travelled by stationary phase} }{ \text{distance travelled by mobile phase} }

Diamond, graphite, graphene.

Diamond, granite, graphite.

Fullerene, graphene, ethene.

Granite, graphite, graphene.

Copper

Copper oxide

Magnesium

Magnesium oxide

3.1 \times 10^{-1}

3.1 \times 10^{-2}

3.1 \times 10^{-3}

2

2, 6

2, 8, 6

2, 8, 8, 6

Aqueous

Gas

Liquid

Solid

1.204 \times 10^{24}

1.505 \times 10^{23}

3.010 \times 10^{23}

2.8 g

4.4 g

14.4 g

17.6 g

Absorption phase

Liquid phase

Mobile phase

Stationary phase

0.18

0.25

4.0

5.6

2Br^- \rightarrow Br_2 + 2e^-

Br^- \rightarrow Br + e^-

Br_2 + 2e^- \rightarrow 2Br^-

Carbon dioxide

Magnesium oxide

Sulfur dioxide

Silicon dioxide