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WorksheetsPhysical and Chemical changes 2
Total questions: 10
Worksheet time: 4mins
Which of the following characteristics is shared by all chemical reactions?
Produce a precipitate
Show a color change
Release heat energy
Form new substances
It is advised not to look directly at the flame when magnesium is burning, which of the following is the reason?
Magnesium can easily catch fire
Watching the flame directly could harm your eyes
Burning magnesium is a chemical reaction
rusty nail
physical change
chemical change
When we add ashes of magnesium ribbon to water it will give
Acidic solution
Basic solution
What is the chemical name given to Rust ?
Iron dioxide
Iron oxide
Steel oxide
Carbon dioxide
What prevents Rusting
Painting , Oiling , Galvinising
Washing with water
When carbondioxide is passed through lime water, ________ is formed which makes lime water milky.
Calcium Hydroxide
Calcium Carbonate
Sodium Bicarbonate
Sodium Acetate
when we add iron to copper sulphate solution, the colour of the solution changes from blue to __________
Green
Red
Colourless
No colour change
What is the chemical name of baking soda
Calcium hydroxide
sodium hydroxide
sodium hydrogen carbonate
sodium carbonate
