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प्रश्न
Asmita went to buy an earthen pot. There she saw many things kept for sale.
What is the difference between a substance and an object?
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उत्तर
Objects are made from substances. Objects have definite shape and size.
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संबंधित प्रश्न
What are the three general classes of matter ? Give one example of each type.
Fill in the following blank :
Milk is a .................... solution but vinegar is a .................... solution.
When the solid A is added to water, it dissolves with the evolution of a lot of heat and making little explosions to form two products B and C. The properties of products B and C are entirely different from those of solid A as well as water. Moreover, products B and C cannot be reconverted into solid A and water. When another solid D is added to water, it dissolves with the absorption of a little heat to form a product E which cools down. The product E shows the properties of both, solid D as well as water. Moreover, product E can be converted into solid D and water.
(a) What type of change occurs when solid A is dissolved in water ? Why ?
(b) What type of change occurs when solid D is dissolved in water ? Why ?
(c) Name a metal which you think could behave like solid A. Also name the products B and C.
(d) Name the solid D if it is the one which is used in making ordinary dry cells.
(e) Name the process by which D can be recovered from E.
What difference in the property of two miscible liquids enables their separation by fractional distillation ?
Name the process which is used in milk dairies to separate cream from milk.
What difference in the properties of oil and water enable their separation by a separating funnel ?
State whether true or false. If false, correct the statement.
Oil and water are immiscible with each other.
Complete the following table:
| S.No. | CELSIUS | KELVIN |
| 1. | 90°C | 363 K |
| 2. | ______ | 283 K |
| 3. | 63 °C | ______ |
| 4. | 250°C | ______ |
| 5. | ______ | 303 K |
Which statement is not correct for a mixture
The phenomenon of Evaporation takes place at the ______ of a liquid.
