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प्रश्न
Classify the following as elements or compounds :
Iron, Iron sulphide, Sulphur, Chalk, Washing soda, Sodium, Carbon, Urea
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उत्तर
| Elements | Compounds |
| Iron, sulphur, sodium, and carbon | Iron sulphide, chalk, washing soda, and urea |
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संबंधित प्रश्न
Define matter.
Differentiate between an atom and a molecule.
Name the terms for the particles of matter which may or may not have independent existence.
What are molecules ?
Classify the following into elements, compounds and mixtures:
- Sodium
- Soil
- Sugar solution
- Silver
- Calcium carbonate
- Tin
- Silicon
- Coal
- Air
- Soap
- Methane
- Carbon dioxide
- Blood
Name one solid, one liquid and one gaseous non-metal.
What is meant by saying that non-metals are brittle ?
What name is given to those elements which are neither good conductors of electricity like copper nor insulators like sulphur ?
The element which is not common between the compounds called baking soda and soda ash is
There are three substances X, Y and Z. The substance X does not have a fixed melting point or boiling point and it still shows the individual properties of its constituents. The substance Y is a pure substance which occurs in nature as such. The substance Y has a fixed melting point and boiling point but it cannot be broken down into simpler substances by any chemical means. The substance Z is also a pure substance whose properties are entirely different from those of its constituents. The substance Z can, however, be divided by electrolysis into two substances which belong to the same class of substances as Y.
- What type of substance could X be ? Name one substance like X.
- What type of substance could Y be ? Name one substance like Y.
- What type of substance could Z be ? Name one substance like Z.
- Which process involves absorption or release of an appreciable amount of energy : formation of substance X or formation of substance Z ?
- Name the three groups into which all the substances like Y are divided on the basis of their properties.
Which of the following is a sol ?
Shaving cream, Milk, Fog, Soap solution, Hairspray
Explain what happens when a beam of light is passed through a colloidal solution.
Define solubility of a substance. How does it vary with temperature ?
One of the following does not show Tyndall effect. This one is :
Name the process by which all the dye can be recovered from black ink.
Explain the meaning of the term matter with special reference to the term ‘substance’.
The non S I and S I units of some physical quantities are given in column A and column B respectively. Match the units belonging to the same physical quantity:
| (A) | (B) | ||
| (a) | degree celsius | (i) | kilogram |
| (b) | centimetre | (ii) | pascal |
| (c) | gram per centimetre cube | (iii) | metre |
| (d) | bar | (iv) | kelvin |
| (e) | milligram | (v) | kilogram per metre cube |
Rusting of an article made up of iron is called
Celsius scale is a scale of temperature in which zero represents the melting point of ice and 100 represents the boiling point of water.
The movement of particles in liquids is ______.
