Question # 1

A _________ is a pure substance is made up of two or more elements.

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Mixture

Elements

Solution

Compound

Neutrons have _________ charge.

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+

_

No

Nil

Atoms are made of sub _________

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Atoms

Molecules

Charge

Atomic particles

Polyatomic molecules consist of _________ atoms.

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1

More than 1

Less than 1

2

The third abundant as found in the earth' crust is:

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Carbon monoxide

Oxygen

Nitrogen

Argon

The atomic number is represented by ____________

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A

Y

X

Z

How many numbers of moles are equivalent to 8 grams of CO₂?

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0.15

0.18

0.21

0.24

The symbol of lead us

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As

Pb

Sb

Na

positive ion hare formed by _________ of electrons.

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Gain

Loss

Sharing

Bonding

The value of Avogadro 'no is:

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6.023×1024

6.023×1026

6.023×1023

6.023×1020

O3, Ozone is _________ molecules.

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Homoatomic

Hetroatomic

Monoatomic

Nil

The symbol of barium is:

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Ba

Bi

Br

B

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