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सी.आई.एस.सी.ई.आईसीएसई ICSE Class 7

Name the Terms for the Change of a Solid into Liquid.

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प्रश्न

Name the terms for the change of a solid into liquid.

एक शब्द/वाक्यांश उत्तर
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उत्तर

Melting.

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अध्याय 1: Matter and Its Composition - Exercise

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एस पी सिंग Concise Chemistry [English] Class 7 ICSE
अध्याय 1 Matter and Its Composition
Exercise | Q 12.1

संबंधित प्रश्न

Gases have definite volume but no definite shape.


Which of the following materials fall in the category of a “pure substance”?

  1. Ice
  2. Milk
  3. Iron
  4. Hydrochloric Acid
  5. Calcium oxide
  6. Mercury
  7. Brick
  8. Wood
  9. Air

What are the characteristics of matter?


When a crystal of potassium permanganate is placed at the bottom of water in a beaker, the water in the whole beaker turns purple on its own, even without stirring. This is an example of :


Name one solid, one liquid and one gaseous non-metal.


On the basis of composition of matter, milk is considered to be :


There is a large group of materials P which can be divided into three groups Q, R and S on the basis of their properties. The substances belonging to group Q can be solids, liquids or gases. The solids belonging to group Q are usually electrical insulators. Most of the substances of group R are solids which are good conductors of electricity. The substances belonging to group S are neither insulators like Q nor good conductors like R. The properties of S are intermediate between those of Q and R.

  1. What could the group of materials P be ?
  2. Name the substances Q. Give two examples of such substances.
  3. Name the substances R. Write two examples of such substances.
  4. Name the substances S. Give two examples of such substances.
  5. Out of Q, R and S, which substances are malleable and ductile ?

How much water should be added to 15 grams of salt to obtain 15 per cent salt solution ?


How will you differentiate between a suspension and a colloid ?


100 mL of water at room temperature of 25°C is taken in a beaker and a little of solid S is dissolved in it by stirring to obtain a solution X. More and more of solid S is added to the solution with constant stirring, while keeping the temperature of solution constant at 30°C. After some time it is observed that no more solid dissolves in water and at the same time some solid is also left undissolved at the bottom of the beaker.

  1. The contents of beaker are filtered through a filter paper to obtain solution Y in the form of a filtrate.
  2. What name is given to solutions like X ?
  3. What name is given to solutions like Y ?
  4. What will you observe if the solution Y at 30°C is cooled down to 10°C by keeping the beaker in crushed ice ? Why ?
  5. What term is used to denote the amount of solid dissolved in 100 grams of water in a solution lie Y ?

Name the process by which common salt is obtained from sea-water.


How is scrap iron separated from a heap of waste materials in factories?


Which of the following mixture cannot be separated by using water as the solvent ?


The best way to recover sugar from an aqueous sugar solution is :


What difference in the properties of common salt and sand would enable you to separate a mixture of these two substances ?


State whether true or false. If false, correct the statement.

Oil and water are immiscible with each other.


The most reactive metal is ______.


In Aerosol the dispersed phase is liquid and the dispersion medium is gas.


Give an example of liquid in gas.


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