Y11 C3 Atoms, Elements & Compounds Pt.2 Bonding

The metal titanium occurs naturally combined with oxygen.

The table shows the combining powers of the elements in this compound.

What could be the formula of the compound?

• TiO₂

• Ti₂O

• TiO₄

• Ti₄O₂

Elements X and Y react together to form a compound.

The diagram shows the outer shells of X and Y after reaction.

Which statement is correct?

• X is in group VII and has formed the X⁺ ion.

• X is in group VII and has formed the X^– ion.

• X is in group VIII and has formed the X⁺ ion.

• X is in group VIII and has formed the X^– ion.

Magnesium forms an ionic compound with chlorine.

Which row describes how the magnesium ion is formed and the formula of the magnesium ion?

• A

• B

• C

• D

The diagram shows the electronic structures of carbon and hydrogen atoms.

What is the formula of the simplest compound formed between carbon and hydrogen?

• CH₂

• CH₄

• C₄H

• C₂H

Sodium chloride (salt) has an ionic structure.

Which compound could be sodium chloride?

• A

• B

• C

• D

The structures of compounds X and Y are shown.

What are the correct formulae for these two compounds?

• X is C₆H₁₄; Y is C₆H₁₀

• X is C₆H₁₄; Y is C₆H₁₂

• X is C₆H₁₂; Y is C₆H₁₀

• X is C₆H₁₂; Y is C₆H₁₂

Which statement describes how magnesium atoms and nitrogen atoms combine to form magnesium nitride, Mg₃N₂?

• Each magnesium atom loses three electrons and each nitrogen atom gains two electrons.

• Each magnesium atom loses two electrons and each nitrogen atom gains three electrons.

• Each nitrogen atom loses three electrons and each magnesium atom gains two electrons.

• Each nitrogen atom loses two electrons and each magnesium atom gains three electrons.

How many atoms of metals and of non-metals are shown in the formula Na₂SO₄?

• A

• B

• C

• D

Which covalent molecule contains the most shared pairs of electrons?

• CH₄

• CO₂

• C₂H₄

• NH₃

Diagrams W, X, Y and Z represent the structures of four different compounds.

Which row identifies these compounds? Answers are shown in the same order as the molecules in the diagram.

• NO₂ CO₂ H₂O SO₂

• NO₂ H₂O SO₂ CO₂

• SO₂ CO₂ NO₂ H₂O

• SO₂ NO₂ CO₂ H₂O