Question

ASSIGNMENT-4- IS MATTER AROUND US PURE:

Q-1) Gold can be drawn in wire. Name the property.

Q-2) between sulphur and copper which one you will use for making wire.

Q-3) silver is best conductor of electricity still electrical wires are made of

copper and aluminium. Why?

Q-4) 1. Name a soft metal.

2. Name the element present in diamond.

3. Name a non-metal having shining surface.

4. Name an element used as semi-conductor.

Q-5) Why metals are used in making instruments like bells, tanpura and violin?

Q-6) Why metalloids are used as semi-conductor?

Q-7) Non-metals are bas conductor of electricity. Name a non-metal which is

conductor of electricity and is used in making electrodes.

Q-8) Is Diamond element or compound? Write its composition.

Q-9) Non-metal are usually soft. Do you know any hard non-metal? If yes,

name it.

Q-10) Why water is a compound not a mixture?

Q-11) Which of the following will show properties of its constituents?

Methane or soil.

Q-12) Name solute in brass

Q-13) Particle size of a substance was 50 mm. Is solution or colloid or

suspension?

class-9th
subject-science
Please ans me fast....​

Answer 1

mam plz cooperation as it is not easy to.answer all

Answer 2

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1. Ductility
2. Copper
3. Silver is a very good conductor of electricity but still that is not used in electric wiring primarily due to its cost. It's very expensive compared to the widely used wiring material copper. Another reason for not using silver is that , it oxidizes easily and tarnishes when it comes in contact with air.
4. (a.) Lead ... (b.) carbon... (c.) Iodine, graphite... (d.) silicon
5. Because metals are sonorous and produces ringing sound when we strikes it.
6. They are semiconductors because their electrons are more tightly bound to their nuclei than are those of metallic conductors. Their chemical behavior falls between that of metals and nonmetals.
7. The non metal which is good conductor of electricity is graphite.
8. Diamond is made of pure carbon, with carbon atoms arranged in a cubic structure and bonded to their neighbors in a very compact way. So, diamond is made of an element but it is not an element. It is not a compound either, because, by definition, a compound is made up of two or more elements.
9. Diamond is a hard non metal.
10. A mixture is when two or more substances combine physically together. However, in water, two hydrogen atoms combine with one oxygen atom chemically, forming a new substance that has properties different from hydrogen alone or oxygen alone. ... Therefore, water is not a mixture; it is a compound and it is pure.
11. Soil
12. Since brass is an alloy of copper and zinc so zinc is the solvent and copper acts as solute.
13. The particle size of a substance was 50nm is a colloidal solution because the size of particles, which is less than 1nm falls in solutions, the size of particles between 1nm and 1000nm falls in colloids. Moreover the size of particles with more than 1000nm falls in suspensions.

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