Question 13 Marks
How are non-metal ions formed? Give two examples.
Answer
View full question & answer→Non-metals have a tendency to accept electrons in their valence shell to form negatively charged ions called anions.
Examples:
Examples:
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Question 23 Marks
How do non-metals react with oxygen? Explain with an example.
Answer
View full question & answer→Non-metals combine with oxyen to form their oxides.
Non-metal + Oxygen → Non-metal oxide
When carbon burns in air, it combines with oxygen to form carbon dioxide.
Non-metal + Oxygen → Non-metal oxide
When carbon burns in air, it combines with oxygen to form carbon dioxide.
Question 33 Marks
How do metals react with water? Explain with an example.
Answer
View full question & answer→Most metals do not react with cold water. But some metals like sodium and potassium react with cold water to form their hydroxides and hydrogen gas.
Sodium reacts with water to form sodium hydroxide.
Sodium reacts with water to form sodium hydroxide.
Question 43 Marks
How do metals react with acid? Explain with an example.
Answer
View full question & answer→The metals react with dilute acids to form metal salts. Metals liberate hydrogen gas from dilute acids.
Metal + Dilute acid → Metal salt + Hydrogen gas.
Magnesium reacts with dilute HCl to form magnesium chloride and hydrogen gas.
Metal + Dilute acid → Metal salt + Hydrogen gas.
Magnesium reacts with dilute HCl to form magnesium chloride and hydrogen gas.
Question 53 Marks
State the properties of non-metals.
Answer
View full question & answer→- Non-metals lack lustre.
- As non-metals are brittle, they are not malleable.
- They are not ductile.
- Non-metals are poor conductors of heat and electricity.
- At ordinary temperature, non-metals are in the solid or gaseous state. (Exception: Bromine is liquid.)
- Non-metals have low density in the solid state.
Question 63 Marks
State the properties of metals.
Answer
View full question & answer→- Metals have a lustre.
- Metals are malleable. They can be beaten into thin sheets.
- Metals are ductile. They can be drawn into wires.
- They are good conductors of heat and electricity.
- At ordinary temperature, metals are generally solid. (Exception: Mercury is liquid.)
- Metals usually have high density.
Question 73 Marks
What are the adverse effects of i corrosion?
Answer
View full question & answer→- A reddish coloured deposit (rust) is formed on iron by reaction with oxygen gas.
- A greenish coloured deposit (copper carbonate) is formed on copper by reaction with carbon dioxide.
- A blackish coloured deposit is formed (silver sulphide) on silver.
- Corrosion causes damages to car bodies, bridges, iron railings, ships specially those of iron, silver articles and copper vessels.