مركز الاختبارات الالكترونية

Science Prep 1

Read the questions and focus before you answer!!

1. The liquid element whose molecule contains one atom is……………………….

a) Neon
b) Mercury
c) Bromine
d) Oxygen

2. The third energy level “M” is saturated with…………………………. electrons.

a) 6
b) 18
c) 8
d) 32

3. The fundamental building unit of matter that can take part in the chemical

reaction.

a) Molecule
b) Atom
c) Element
d) Compound

4. The number of atoms in the hydrogen chloride compound

is…………………………

a) 1
b) 2
c) 3
d) 4

7. The change of the matter from a Solid-state to a Liquid state is known

as…………………………

a) Heating
b) Melting
c) Vaporization
d) Boiling point

6. The solutions which are used in conducting electricity

is…………………………………

a) Sugary and Acidic solutions
b) Salt and Sugary solutions
c) Salt and Acid in benzene solution
d) Salt and Acidic solution

D) Write the symbols:

1. Sodium

2. Potassium

3. Calcium

4. Boron

A) Write the name of the element:

1. H

2. He

3. Au

4. Hg

5. Cr

6. Fe

C) Write down the mass number and atomic number for each of the

following:

1. ₂₀⁴⁰Ca

2. ₁₈⁴⁰Ar

B) Write the Electronic configuration for:

1. 19K

2. 13Al

3. 4Be

4. 7N

5. 10Ne

A) Give reason

1. A piece of wood floats on the water surface, while a piece of lead sinks in it.

2. Atoms of active elements (Unstable) take part in chemical reactions.

3. It is difficult to break down a piece of iron with your hand

4. The atom is electrically neutral in its ordinary state.

B) What is meant by:

1. Boiling point

2. Element

3. Energy levels

4. Inactive element

1. The measuring unit of mass is …………..., while …………. is the measuring unit of volume.[ ................... ]
Kg or gm, cubic centimeter
Kg or gm, cubic centimeter or L

2. Steel bridges and the holder of the light bulb are painted from time to time to be protected from …………………. and ……………[ ................... ]
rust and corrosion
rust-corrosion

3. …………. takes the shape of the container, while ………... have definite shape.[ ................... ]
Liquid - Solid
gas - liquid

4. The second energy level (L) is saturated with …………., while the fourth one (N) is saturated with ……………. Electron[ ................... ]
2-18
8 - 32

5. Electron are particles with …………... charges, while proton is particles with ……………... charges.[ ................... ]
neutron - positive
negative - positive

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