Question

PRACTICE PAPER
1.Name the smallest particles of a substancewhich is capable of independent existence.

2.consist of two subatomic
particles:protons andneutroms.

3. Name the scientist who discover electrons.

4. Which state of matter has manionum force of attraction between the particles.

5. The process of changing of a liquid state into a solid state is known as ----

6. The compound rust is a hydrated oxide of

7. Boiling of eggs is an example of change.

8. Oxygen has --- valency

9. The negatively charged ion is called--

10. The changes which are useful to mankind are said to be change.

11. Write the chemical formula of following radicals, carbonate hydroxide

12. Combustion is an example of ----change. (physical/chemical)

13. The temperature at which liquid changes to
solid.

14. Write the electron distribution of Mg atom,
15. -- -- are least compressible. 1:55 PM​

Answer 1

Answer:

• atom

An atom is the smallest particle of the element that can exist independently and retain all its chemical properties.

• A proton is made of two up quarks and one down quark, while the neutron is made of two down quarks and one up quark. These commonly bind together into an atomic nucleus, e.g. a helium-4 nucleus is composed of two protons and two neutrons.

• The British physicist Joseph John (J. J.) Thomson (1856–1940) performed a series of experiments in 1897 designed to study the nature of electric discharge in a high-vacuum cathode-ray tube, an area being investigated by many scientists at the time

• solid
• The force of attraction between particles of a solid is maximum because they are closely packed.

• freezing

• Rust consists of hydrated iron(III) oxides Fe2O. nH2O and iron(III) oxide-hydroxide (FeO(OH), Fe(OH)3). Given sufficient time, any iron mass, in the presence of water and oxygen, could eventually convert entirely to rust

• Answer and Explanation:
• Boiling an egg is a chemical reaction. The heat taken in by the egg causes permanent changes to the molecular structure of the egg, creating a new

• The valency of oxygen is -2. This means oxygen needs to gain or share two electrons for stability. Remember, electrons are negative, which is why the...

• Positively charged ions are called cations; negatively charged ions, anions. ...

• dont know

Answer 2

Explanation:

1 atom

3 Ernest Rutherford

4solids

5 freezing

6 Rust consists of hydrated iron(III) oxides Fe2O3·nH2O and iron(III) oxide-hydroxide (FeO(OH), Fe(OH)3). Given sufficient time, any iron mass, in the presence of water and oxygen, could eventually convert entirely to rust.

7 solid state into liquid

9 cathode

10 dont know

11 coh2o