Assignment for Class 8 Science Chapter 4 Materials Metals And Non-Metals
Class 8 Science students should refer to the following printable assignment in Pdf for Chapter 4 Materials Metals And Non-Metals in standard 8. This test paper with questions and answers for Grade 8 Science will be very useful for exams and help you to score good marks
Chapter 4 Materials Metals And Non-Metals Class 8 Science Assignment
Q1. How are elements classified ?
Q2. What are metalloids ? Give 2 examples.
Q3 a. Define the terms: Malleability and Ductility
b. Name the two most malleable metals.
Q4. State the difference between metals and non metals on the basis of the following criteria –
a. Lustre b. Thermal & electrical conductivity
c. Physical state d. Ductility
Q5. Answer in one word:
a. A liquid metal
b. A liquid non metal
c. A soft metal
d. A lustrous non metal
e. A hardest naturally occurring non metal
f. A non-metal which conducts electrically
g. A metal having low melting point
Q6. State the differences between:-
Metals and non –metals in their reaction with Oxygen. Give 2 examples of the kind of oxides formed by them.
Q7. Explain the phenomena of rusting with the help of a word equation ?
Q8. Give reasons:-
a. When Iron is mixed with Copper Sulphate Solution, the colour of the solution changes.
b. Metals like Sodium & Potassium are stored in Kerosene oil while non-metals like Phosphorous is stored in water.
c. Copper is used for making electrical wires.
d. Copper loses its Lustre and develops a green coating over it when exposed to atmosphere.
Q9. An unknown element X reacts in air to form its oxide Y. This Y dissolves in water which turns blue litmus into red. Predict whether X is a metal or a non-metal ?
Q10. a. Name the products formed when a piece of Sodium metal is added to water.
b. When the solution so formed, is tested with litmus, what kind of colour change is expected ? Reason out your answer.
Q11. How do you test the presence of Hydrogen gas ?
Q12. Complete the following reactions:-
a. Magnesium + Oxygen →
b. Magnesium Oxide + Water →
c. Iron + Oxygen + Water →
d. Sulphur dioxide + Water →
e. Aluminium + Hydrochloric acid →
f. Iron + Sulphuric Acid →
g. Copper + Hydrochloric acid →
h. Copper + Sulphuric acid (dil.) →
i. Copper Sulphate + Zinc →
j. Copper Sulphate + Iron →
k Copper + Zinc Sulphate →
l. Copper + Iron Sulphate →
m. Zinc Sulphate + Iron →
Q13. A Copper statue was found to lose its lustre after some time. A layer of dull green coating was deposited over it. Explain the cause along with a relevant word equation.
Q14. Consider the following reactions –
a. A + BX → AX + B
b. B + CY → BY + C
Arrange A, B, C in the increasing order of their reactivity.
Q15. What would happen when a Copper wire is dipped in Silver Nitrate solution ?
Q16. Can you guess?
a. Non-metal essential for our life
b. Non-metal used in fertilizers for growth of plants
c. Non-metal which is used in purification of water
d. Non-metal used as an antiseptic over wounds
e. Non-metal used in crackers
Click on link below to download CBSE Class 8 Science Materials Metals And Non Metals Assignment Set E
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