Free Printable ATOMS AND MOLECULES

1.

How would H2O be classified?

a)

Atom

b)

Molecule

c)

Compound

d)

SURD

2.

How would O2 be qualified.

a)

Atom

b)

Molecule

c)

Compound

d)

TRIATOMIC MOLECULE

3.

What is an element?

a)

A pure substance that cannot be broken down.

b)

Two atoms bonded together.

c)

Two or more different types of atoms bonded together.

d)

An molecule with an unequal distribution of charge.

4.

What are atoms composed of?

a)

Protons and electrons.

b)

Protons, neutrons, and electrons.

c)

Neutrons and electrons.

d)

Ions, elements, and compounds.

5.

What two subatomic particles are found in the nucleus?

a)

proton and electron

b)

electron and neutron

c)

neutron and proton

d)

neutron and electron

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.

Where are electrons found?

a)

the nucleus

b)

next to the neutrons

c)

the proton

d)

orbiting the nucleus

8.

What is this?

a)

Compound

b)

Element

c)

Mixture of elements

d)

Mixture of compounds

9.

How many moles of water are present in 180ml of water? (hint: $\rho=\frac{1g}{cm^3}$ )

a)

10

b)

1

c)

0.1

d)

0.01

10.

Who coined the term atom?

a)

JOHN DALTON

b)

DEMOCRITUS

c)

LEUCIPPUS

d)

MAHARISHI KANAD

11.

Formula of Aluminium Sulphite is:

a)

$Al_2\left(SO_4\right)_3$

b)

$Al_2\left(SO_3\right)_3$

c)

$Al_3\left(SO_4\right)_2$

d)

none of these

12.

NaBr is the formula for:

a)

Sodium Bromite

b)

Sodium Bromide

c)

Barium bromide

d)

Potash Alum

13.

Molecular mass of Magnesium Phosphate is:(P=31)

a)

262g

b)

262 u

c)

261g

d)

261 u

14.

__________ suggested that the symbols of elements be made from one or two letters of the name of the element. Today_________________ approves names of elements, symbols and units.

a)

John Dalton, International Union of Pure and Approved Chemistry

b)

John Dalton, International Union of Pure and Applied chemistry

c)

Proust, International Union of Pure and Approved chemistry

d)

Berzillius, international Union of Pure and Applied Chemistry

15.

From 22g of $CO_2$ , $2\times10^{23}$ molecules are removed. How many grams of $CO_2$ are left.( take $N_A=6\times10^{23}$ )

a)

6g

b)

7.03g

c)

8g

d)

data inadequate

ATOMS AND MOLECULES

Total questions: 15

Worksheet time: 6mins

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