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प्रश्न
What are molecules ?
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उत्तर
Molecules are made of atoms. Molecules exhibit the properties of that kind of matter and has independent exi stance.
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संबंधित प्रश्न
The smallest unit of matter that exists freely in nature is called ...........
Fill in the blank
Liquids have a definite ______
During respiration, glucose and oxygen enter our body cells and waste products carbon dioxide and water leave the body cells by the process of :
Name the property which enables metals to be drawn into wires.
Give reason why copper metal is used for making electric wires.
Name a metal which has a low melting point.
Which of the following does not have a fixed melting point/boiling point ?
Which of the following contains less solute at a given temperature and pressure ? Unsaturated solution or Saturated solution.
What is the difference between solutions and colloids ?
Classify the following into solutions, suspensions and colloids :
Soda-water, Milk, Brine, Blood, Ink, Smoke in air, Chalk water mixture, Milk of Magnesia, Shaving cream, Muddy river water.
Differentiate between a saturated and an unsaturated solution. How will you test whether a given solution is saturated or not ?
Name the process by which common salt is obtained from sea-water.
Write a few lines on the blackboard with a chalk. Now observe the chalk. What changes do you see in the chalk?
Complete the given analogy.
Murukku from hot oil: ______:: Coffee powder residue from decoction: ______
Justify your answer.
| Figure 1 | Figure 2 | Figure 3 |
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The arrangement of particles in three different phases of matter is shown above.
- Which state is represented by Fig. 1?
- In which state will the inter-particle attraction be maximum?
- Which one of them cannot be contained in an open vessel?
- Which one can take the shape of its container?
State whether true or false. If false, correct the statement.
Oil and water are immiscible with each other.
Celsius scale is a scale of temperature in which zero represents the melting point of ice and 100 represents the boiling point of water.
Gases change to liquid by the process of ______.
Evaporation does form bubbles.
The pressure of gases does not depend on the temperature of the gas and the volume it occupies.
