10 questions🇬🇧English
🔗 Ionic & Covalent Bonding – GCSE
Chemistry · GCSE — practise how ionic and covalent bonds form, dot-and-cross diagrams and the properties of substances
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Questions
What happens to electrons when an ionic bond forms between a metal and a non-metal?
They transfer from the non-metal atom to the metal
They become delocalised around metal ions
They transfer from the metal atom to the non-metal
They are shared between the two atoms
20s
Magnesium is in Group 2 of the periodic table. What is the charge on a magnesium ion?
6−
1+
2−
2+
20s
What is a covalent bond?
A shared pair of electrons between two atoms
A single electron moving from one atom to another
Attraction between oppositely charged ions
Attraction between ions and delocalised electrons
20s
Aluminium forms Al³⁺ ions and oxygen forms O²⁻ ions. What is the formula of aluminium oxide?
AlO₃
Al₃O₂
AlO
Al₂O₃
30s
Under which conditions can an ionic compound such as sodium chloride conduct electricity?
Only when it is solid
When it is solid or molten
Only when dissolved in water
When molten or dissolved in water
30s
In a dot-and-cross diagram of a water molecule, how many pairs of electrons on oxygen are NOT used in bonding?
4
3
1
2
30s
Methane, CH₄, is a simple molecular substance. Why does it have a very low boiling point?
It has no electrons in its outer shells
The covalent bonds in it are weak
Its ions are only weakly attracted
The forces between its molecules are weak
30s
How many shared pairs of electrons are there between the two atoms in a nitrogen molecule, N₂?
3
1
2
5
30s
Graphite and diamond are both giant covalent structures of carbon. Why does graphite conduct electricity?
Its layers can slide over each other
Its covalent bonds are weaker than in diamond
It contains ions that are free to move
Each carbon atom has one delocalised electron
30s
Pure metals are malleable, so they can be hammered into shape. What explains this property?
Metal atoms share pairs of electrons
The metallic bonds are weak and break easily
Delocalised electrons move through the metal
Layers of metal ions can slide over each other
30s