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प्रश्न
Define the following term of Matter .
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उत्तर
Matter—Anything that has mass and occupies space is called matter.
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संबंधित प्रश्न
Differentiate between an atom and a molecule.
When extremely small particles X derived from the anther of a flower were suspended in a liquid Y and observed through a microscope, it was found that the particles X were moving throughout the liquid Y in a very zig-zag way. It was also observed that warmer the liquid Y, faster the particles X moved on its surface.
- What could particles X be ?
- What do you think liquid Y is ?
- What is the zig-zag movement of X known as ?
- What is causing the zig-zag movement of particles X ?
- Name the scientist who discovered this phenomenon.
- What does this experiment tell us about the nature of liquid Y?
What are pure substances ? Give two examples of pure substances.
What is the other name for impure substances ? Give two examples of impure substances.
In the following set of substances, one item does not belong to the set. Select this item and explain why it does not belong to the set :
Hydrogen, Oxygen, Steam, Chlorine
How will you test whether a given solution is a colloidal solution ?
What will happen if a saturated solution is :
- heated
- cooled
What do you understand by the statement " the solubility of copper sulphate in water at 20°C is 20.7 g" ?
What is a colloid ? Give two examples of colloids (or colloidal solutions)
Fill in the following blanks with suitable words :
Immiscible liquids are separated by using a .....................
Fill in the following blanks with suitable words :
The separation of liquids by fractional distillation is based on the difference in their .....................
The liquid air has three components X, Y and Z whose boiling points are : –186°C, –183°C and –196°C,
respectively. When liquid air is fed into a tall fractional distillation column from near its bottom and warmed
up slowly :
(a) Which component will be collected from near the bottom of the fraction distillation column ? Why ?
(b) Which component will be collected from the top part of the fractional distillation column ? Why ?
(c) Which component will be collected from the middle part of the fractional distillation column ? Why ?
(d) What could the component X, Y and Z be ?
The given mixture contains three constituents A, B and C. The constituent A is a yellow coloured, solid element which dissolves in a liquid D. The constituent B is a blue coloured salt which is insoluble in liquid D but dissolves easily in another liquid E. The constitudent C is a liquid which is used in cooking food and forms a solid fat on hydrogenation.
(a) What do you think could (i) constituent A, and (ii) liquid D be ?
(b) What could (i) constituent B, and (ii) liquid E be ?
(c) What could liquid C be ?
(d) How will you separate the mixture containing A, B and C ?
What difference in the properties of common salt and sand would enable you to separate a mixture of these two substances ?
Which of the following are homogeneous in nature?
(i) ice
(ii) wood
(iii) soil
(iv) air
Solid is an arrangement of particles ______.
Solids do not flow.
The pressure of gases does not depend on the temperature of the gas and the volume it occupies.
The phenomenon of Evaporation takes place at the ______ of a liquid.
Examples of foam are ______.
