Mcq Element Compound And Mixture (2) 2e95f

Marking class work on element compound and mixture.

Name:....................................................................................Grade: ........Sec:.......Roll:......... A. Multiple choice questions

[10]

1) Which one is a pure substance that cannot be split up into two or more simpler substances by chemical processes or by electricity? a) Atom b) Element c) Compound d) Mixture 2) We use chemical symbols to represent ____________? a) Element b) Compound c) Molecule d) Mixture 3) Elements can be classified into two major groups, they are________ and _________? a) Ionic and covalent b) Compound and mixture c) Metal and non-metal d) Mixture and solution 4) Why is Na classified as a metal? a) It is a pure substance b) It is very soft c) It is very hard d) It is good conductor of electricity. 5) Which element exists as atom? a) H b) Ne c) Na d) N 6) What is the meaning of N2? a) Two Nitrogen molecules. b) Two separate Nitrogen atoms. c) One Nitrogen molecule. d) One Nitrogen compound. 7) Which one of the following represents a compound? a) b) c) d)

8) Brass is mixture of _______ and ___________ a) Copper and Tin b) Copper and Zinc c) Copper and Iron d) Zinc and Tin 9) What can be separated by physical method? a) Element b) Compound

c) Molecule d) Mixture 10) Copper wire is an example of ________? a) Element b) Compound c) Alloys d) Mixture B. Write down the answer of the following questions. 1. Write four differences between a mixture and compound. Points

mixture

[4] compound

2. Classify these substances as element, mixture or compound. element

mixture

[3] compound

Petroleum, table salt, oxygen gas, sand, soil, sugar, carbon dioxide, sea water, air 3. Write four differences between a metal and non-metal. Points

metal

[3] non-metal