Grade 7 ICSE/Chemistry

Q1. Choose the Correct alternative

1. A compound is a substance that contains .......

A. only one type of atom

B. two or more chemicals which can be easily separated

C. two or more elements chemically joined together

2. Salt, sugar, chalk, and sand are all

A. elements

B. compounds

C. mixtures

D. solutions

3. To make the specific compound, elements are mixed in a fixed proportion by

A. Mass

B. Weight

C. Volume

D. Density

4. The formation of compounds involve

A. chemical reaction

B. physical reaction

C. evaporation

D. distillation

5.The properties of the compound, as compared to properties of its constituents are

A. same

B. different

C. constant

D. exact

6. Which of these is NOT a compound?

A. Carbon monoxide

B.Chlorine

C. Hydrochloric acid

Q2. Magnesium Sulfate is a compound.

Answer the following questions related to Magnesium Sulfate.

a. Name the elements present in the compound mentioned above. 

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b. What is a compound?

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Q3. State two differences between elements and compounds.

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Q4.  Write the name of the compound that is responsible for Global warming.

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Q5. Table salt is made of sodium and Chlorine.

a.  Give the chemical name of the Table salt.

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b. Is it an element or a compound.

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6. Explain we cannot consume sodium and chlorine but we can consume table salt.

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7. Classify the following substances in to solid, liquids and gases.

Air, water, kerosene, pebbles, basket ball, cheese,  carbon, carbon dioxide.

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8. State 3 properties of each of the following

A. solid

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B. Liquid

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C. Gases

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