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WorksheetsClass 7- Physical and Chemical Change and Acids and Bases
Total questions: 20
Worksheet time: 15mins
A change is a chemical change when it is accompanied by:
energy change
formation of new substances
change in chemical properties
all of the above
Expansion and contraction of metals is a:
physical change
chemical change
irreversible change
none of these
Expansion and contraction of metals is a:
physical change
chemical change
irreversible change
none of these
Hydrochloric acid is added to a beaker containing a piece of zinc. Zinc chloride is formed and hydrogen gas is released.This is an example of:
chemical reaction
physical change
crystallisation
none of these
Choose the statements suitable for acid
Have alkaline taste
Turns red litmus blue
Turns blue litmus red
No color change to Blue lithmus
The medicines used to reduce acidity are known as ..............?
Acids
Antacids
Alkalies
Salts
When the soil is too Basic, what do you add to neutralise the effect ?
Basic Quicklime
Phenolphthalein
Organic Matter
Nitric Acid
When neutralization reaction happens, they form -
Salt and Sodium Chloride
Salt, Water and Heat
Heat and Sugar
Before Factory wastes are disposed out to Waterbodies, why do they add basic substances ?
So that the Factory wastes decomposes in Waterbodies
Because they have Respect towards them
So that they do not harm the Aquatic animals and Plants
None of the Above
Identify the image.
Fungus
Lichens
Plant
Tooth decay is formed by the presence of base.
True
False
If an indicator gives changes colour with a acid it does not change colour with an acid.
True
False
When an equal strength acid and base are mixed, what kind of chemical reaction occurs?
Neutralization
Combustion
Oxdation
Decomposition
Acid secreted by our body (stomach) for digestion of food is-
Concentrated Hydrochloric acid
dilute Acetic acid
dilute Hydrochloric acid
Concentrated Sulphuric acid
