Free Printable Atoms and Molecules

1.

Which of the following statements is not true about an atom?

a)

Atoms aggregate in large numbers to form the matter that we can see, feel or touch

b)

Atoms are always neutral in nature

c)

Atoms are the basic units from which molecules and ions are formed

d)

Atoms are not able to exist independently

2.

The chemical symbol for nitrogen gas is

a)

$N$

b)

$N_2$

c)

$N^+$

d)

$Ni$

3.

The mass of one atom of oxygen is

a)

$\frac{\left(16\right)}{\left(6.022\times10^{23}\right)}g$

b)

$\frac{\left(32\right)}{\left(6.022\times10^{23}\right)}g$

c)

16g

d)

8g

4.

The chemical symbol for sodium is

a)

So

b)

S

c)

NA

d)

Na

5.

What is the chemical symbol for the element mercury?

a)

Hg

b)

Merc

c)

MeC

d)

MY

6.

What is an ion?

a)

a charged atom

b)

an atom with different neutrons

c)

atoms with no protons

d)

atoms with no electrons

7.

Explain the difference between an atom and a molecule.

a)

One molecule is made of one atom.

b)

One molecule is always made of different particles.

c)

One molecule is made of more than one atom.

d)

One molecule is made of more than two atoms.

8.

Elements are made of

a)

many types of atoms

b)

the periodic table

c)

one type of atom

d)

molecules

9.

A balanced chemical equation is in accordance with:

a)

Avogadro's law

b)

Law of conservation of mass

c)

Law of multiple proportions

d)

Law of reciprocal proportions

10.

Avogadro number is...

a)

Number of atoms in one gram of element

b)

Number of liters which one mole of gaseous substance occupies at N.T.P.

c)

Number of molecules, atoms or particles present on one mole of any substance

d)

All are correct

11.

The percentage of copper and oxygen in samples of “CuO” obtained by different methods were found to be the same. This illustrates the law of:

a)

Constant proportions

b)

Conservation of mass

c)

Multiple proportions

d)

Reciprocal proportions

12.

How many atoms are there in one mole of carbon? ( more than one option can be right)

a)

Avogador's number

b)

28000

c)

$6.022\times10^{23}$

d)

A lot

13.

We will celebrate the _____ Republic day on 26th Jan 2022.

a)

72nd

b)

75th

c)

69th

d)

73rd

14.

1 nanometer =

a)

$\frac{1}{10^9}m$

b)

$10^9m$

c)

$\frac{1}{10^{19}}m$

d)

$10^3$

15.

Symbol for Gold is ______.

a)

F

b)

Au

c)

Go

d)

Pb

Atoms and Molecules

Total questions: 15

Worksheet time: 12mins

Similar Resources on Wayground