Which of the following metal is a poor conductor of heat?
Important Questions on Metallurgy
Materials through which things cannot be seen are called:
Which of these materials do NOT mix with water?
Rinku is studying in class 8. The science teacher has announced a practical test. In this test the students will have to test different materials for their qualities and based on the qualities they will have to guess if the material is a metal or not. Rinku conducted the tests and put the findings as follows:
Sample no 1: malleable, sonorous and a good conductor of electricity
Sample no 2: non-malleable, non-sonorous and a poor conductor of electricity
Sample no 3: malleable, sonorous and a poor conductor of electricity
Rinku is not able to identify these samples as metals or non-metals. She asked her friend Jyothi to help her but jyothi refused.
Do you think Jyothi should have helped Rinku? Give reasons.
Which of the following substances floats in water?
Choose from the following list of substances one substance which matches the description given below:
Aluminium nitride, copper, lead chloride, fluorine, methanol, ethyne, sulphur, zinc, concentrated sulphuric acid, acetic acid, chlorine, methane and phosphorus.
The non-metal which forms two compounds on reacting with chlorine.
Differentiate between metals & non-metals on the basis of
Malleability and ductility
| Electronic configuration | ||
| Nature of oxide | Dissolves in water and turns blue litmus red | Very low solubility in water. Dissolves in hydrochloric acid. |
| Tendency for oxidising and reducing reactions | Tends to oxidise elements and compounds | Tends to acts as a reducing agent. |
| Electrical and thermal conductivity | Very poor electrical conductor. Poor thermal conductivity | Good electrical conductor. Good thermal conductor. |
| Tendency to form alloys and amalgams | No tendency to form alloys | Form alloys. |
Using the information above, fill in the blank.
_____ is the metallic element.
Rinku is studying in class 8. The science teacher has announced a practical test. In this test the students will have to test different materials for their qualities and based on the qualities they will have to guess if the material is a metal or not. Rinku conducted the tests and put the findings as follows:
Sample no 1: malleable, sonorous and a good conductor of electricity
Sample no 2: non-malleable, non-sonorous and a poor conductor of electricity
Sample no 3: malleable, sonorous and a poor conductor of electricity
Rinku is not able to identify these samples as metals or non-metals. She asked her friend Jyothi to help her but jyothi refused.
Can you help Rinku to identify the metals from the above samples?
Choose the materials through which sunlight pass.
Write the chemical equations to show how elements and form ions.
Follow the clues and solve the terms you have learned.
Across:
1. The property of metals by which they can be beaten into thin sheets
5. Capable of producing a ringing sound.
7. A substance which is made up of only one kind of atom, and cannot be broken down into simpler substances by chemical means.
8. A material that allows heat or electricity to pass through it easily
Down:
2. The property of a metal by which it can be drawn into wires.
3. Malleable and ductile elements which are good conductors of heat and electricity
4. The elements whose properties are intermediate between those of metals and non-metals.
6. The smallest particle of an element
Write a chemical equation to show the direct combination of and to form a compound.
