Question

19.02.20
Grade 10
Student Name kamesh
Subject Science Assignment CHEMICAL REACTIONS AND
EQUATIONS
Date
2 hours
Max. marks 50
Ta. Why should magnesium be cleaned with sand paper before burning?
b. Why iron nail be cleaned before reacting with CuSO. solution?
2. What is the product formed upon burning magnesium in air?
3. Write the reaction of the above product with water. Which litmus paper will change its colour when
dipped in the above solution? Why?
4. State the five different observations that one could look for in a reaction? Give one reaction for each.
5. Explain the terms 'word equation', 'skeletal equation', 'unbalanced equation' and 'balanced equation'.
6. Name the method used to balance chemical cquations.
7. State the law of conservation of mass. On the basis of this law, explain why chemical equation should
be balanced
8a. Complete and balance the chemical equations for the following.
1. The reaction of zinc granules with dilute sulphuric acid.
1. The reaction of iron with steam.
b. Explain why zinc granules are used in its reactions.
9. State the information included in chemical equation in addition to the balanced equation with suitable
examples
in omnlete and balance the following equations and state which type of reactions they belong to:
1
11.
hull​

Answer 1

Answer:

Explanation:

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