Question

A. Fill in the blanks.
1.
is anything that has mass and occupies space.
2.
have fixed shape and volume.
3. The Kinetic Theory of Matter states that matter consists of very small particles that are constantly in
and possess
4. The
of the matter and the
occupied by the matter may vary within a
system but the mass remains constant.
5. The total mass of the
is equal to the total mass of the
in a chemical reaction.
6. A
refers to the transformation of a substance from one form to another.
7. Changes that take place over a period of time are called
changes.
8.
changes occur due to human effort or activity.
9. An
in the humidity in the air decreases the rate of evaporation.
10. A chemical change is
and
11. A
is a substance composed of two or more elements chemically combined in a
definite proportion by mass.
12. The process used to separate a mixture which has one of the components made up of iron is called
13. The technique of
is based on the principle of wetting of components of a
mixture.
14.
is used to separate a mixture of miscible liquids.
15.
is considered to be the simplest type of chromatography.
16. The metal plate connected to the positive terminal of the voltage source is called the
17. The number of electrons in an atom is equal to the number of protons in the atom which makes the
atom electrically
18. The arrangement of electrons in different orbits or shells around the nucleus of an atom is called
19. Elements with valency two are called
elements.
20. The chemical bond formed by sharing of electrons is called
21. The electrons present in the valence shell are called
22. A
refers to a group of different atoms present as a single unit having a positive or
negative charge.
23. A_ equation has an equal number of atoms of one or more elements in the reactants
and products.
states that matter is neither created nor destroyed in a chemical reaction.
24. The
25. A
alters the rate of a chemical reaction without itself undergoing any change.
26. When ammonium hydroxide and iron sulphide solutions are mixed together, a brown-coloured
precipitate of
27. Enzyme
present in the living cells of yeast helps in the fermentation of glucose in alcohol
28. Zinc displaces
from a solution of copper(II) sulphate.
solution or
29. To neutralise the effect of an ant or a bee sting,
solution is applied on the affected area.
is formed​

Answer 1

Answer:

1 matter

2 solids

3 energy

4

5 reactant

6 change

7