WorksheetsLesson 5: Corrosion of metals
Total questions: 8
Worksheet time: 7mins
How we can protect metals from rusting?
by making alloys
by putting it into water
by polishing it
by cutting into small pieces
How do people produce metals?
We can get them by smelting ores
We can get them from minerals
We can get them from microorganisms
Metal + ...... = Metal Oxide + Hydrogen Gas
Water steam
Hydrochloric acid
Cold Water
Nitric Acid
Which metals reacts fast even with cold water to produce hydrogen gas and metal hydroxide?
calcium
strontium
barium
chlorine
By smelting metals from ores, we turn them from a.... state to .....
(a)
Metals chemically interact with water, oxygen, microorganisms, etc. We call this process (a)
Some metals like iron or zinc do not react with cold and hot water, but they can react with water steam at high temperatures. For example, Iron (Fe) + Water Steam (H2O) = (a)
Only metals like gold and platinum, sometimes silver and copper can be found on the Earth in free metallic form.
These metals:
are not active
generally do not produce compounds in nature, but all other metals exist in nature in forms of compounds.
have silvery-blue color
