Atoms and Molecules Test

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Atoms and Molecules Test - 5

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Weekly Quiz Competition

Question 1
1 / -0

Which one of the following phrases would be incorrect to use?

A
A mole of an element

B
A mole of a compound

C
An atom of an element

D
An atom of a compound
Question 2
1 / -0

The same proportion of carbon and oxygen in CO2 obtained from different sources proves the law of

A
reciprocal proportion

B
multiple proportion

C
constant proportion

D
conservation of mass
Question 3
1 / -0

The law of constant proportion was proposed by

A
Dalton

B
Avogadro

C
Joseph Proust

D
A. Lavoisier
Question 4
1 / -0

1.0 mole CO2 contains

A
6.022 × 10^–23 atoms of carbon

B
6.022 × 10^–23 atoms of oxygen

C
6.022 × 10²³ molecules of CO₂

D
3 g atom of CO₂
Question 5
1 / -0

The mass of one atom of carbon-12 is

A
1 g

B
1.99 × 10^–23 g

C
1/12 g

D
1.99 × 10²³ g
Question 6
1 / -0

The percentage of hydrogen in water is

A
1.11%

B
11.11%

C
8.89%

D
88.9%
Question 7
1 / -0

The atom is indivisible, was proposed by

A
Einstein

B
Lavoisier

C
Dalton

D
Proust
Question 8
1 / -0

One atomic mass unit of carbon-12 is

A
1/12 of the mass of one ¹²C atom

B
6.022 × 10²³ g

C
12 g

D
1 g
Question 9
1 / -0

Modern atomic symbols are based on the method proposed by

A
Dalton

B
Berzelius

C
Bohr

D
Mendeleev
Question 10
1 / -0

Numerical value of Avogadro’s number is

A
6.022 × 10²³

B
6.022 × 10²⁰

C
6.022 × 10¹⁵

D
6.022 × 10^–24

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Re-Attempt Weekly Quiz Competition

Atoms and Molecules Test - 5

Result

Atoms and Molecules Test - 5

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SHARING IS CARING

Question 1

A mole of an element

A mole of a compound

An atom of an element

An atom of a compound

Question 2

reciprocal proportion

multiple proportion

constant proportion

conservation of mass

Question 3

Dalton

Avogadro

Joseph Proust

A. Lavoisier

Question 4

6.022 × 10–23 atoms of carbon

6.022 × 10–23 atoms of oxygen

6.022 × 1023 molecules of CO2

3 g atom of CO2

Question 5

1 g

1.99 × 10–23 g

1/12 g

1.99 × 1023 g

Question 6

1.11%

11.11%

8.89%

88.9%

Question 7

Einstein

Lavoisier

Dalton

Proust

Question 8

1/12 of the mass of one 12C atom

6.022 × 1023 g

12 g

1 g

Question 9

Dalton

Berzelius

Bohr

Mendeleev

Question 10

6.022 × 1023

6.022 × 1020

6.022 × 1015

6.022 × 10–24

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6.022 × 10^–23 atoms of carbon

6.022 × 10^–23 atoms of oxygen

6.022 × 10²³ molecules of CO₂

3 g atom of CO₂

1.99 × 10^–23 g

1.99 × 10²³ g

1/12 of the mass of one ¹²C atom

6.022 × 10²³ g

6.022 × 10²³

6.022 × 10²⁰

6.022 × 10¹⁵

6.022 × 10^–24