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Flashcards in Is Matter Around Us Pure Deck (23):
1

Substance definition

Pure form of matter

2

Mixture definition

A mixture is a combination of two or more substances in which each substance retains its individual chemical properties.

Substance is defined as pure form of matter (NCERT).

3

A substance(pure form of matter) cannot be separated into any other kinds of matter through

Physical processes

4

Homogenous mixtures are called

Solutions.

5

Alloy definition

Mixtures of two or more metals or a metal and a nonmetal which cannot be separated into their components by physical methods.

6

Brass composition

30% zinc
70% copper.

7

Tyndall effect

Scattering of light by the particles Ina suspension or colloid.

8

A colloid of solid(dispersed phase) and solid(dispersed medium)

Solid sol

9

A colloid of liquid(dispersed phase) and solid(dispersed medium)

Gel

10

A colloid of solid(dispersed phase) and liquid(dispersed medium)

Foam

11

A colloid of solid(dispersed phase) and liquid (dispersed medium)

Sol

12

A colloid of solid(dispersed phase) and gas(dispersed medium)

Aerosol

13

A colloid of liquid(dispersed phase) and gas(dispersed medium)

Aerosol

14

A colloid of gas(dispersed phase) and liquid (dispersed medium)

Foam

15

A colloid of liquid(dispersed phase) and liquid(dispersed medium)

Emulsion

16

First person to use the word elements

Robert Boyle in 1661.

17

Who first gave a useful definition for elements

Antoine Laurent Lavoisier.
Element : basic form of matter that cannot be be broken down into simpler substances by chemical reaction.

18

Some examples(3) of metalloids

Boron,silicon and germanium.

19

No of elements naturally occurring

92.

20

Hydrogen sulphide smell

Rotten eggs.

21

Mixture of iodine and alcohol

Tincture of iodine.

22

Particles of a solution are less than ..... in diameter

1 nanometer.

23

E.g. of some solids that sublime

Ammonium chloride, camphor, naphthalene and anthracene.