Some Basic Concepts of Chemistry Test

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Some Basic Concepts of Chemistry Test - 17

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Weekly Quiz Competition

Question 1
1 / -0

What is the atomic mass (u) of sodium?

A
22

B
23

C
23.5

D
24

Solution

Sodium is a chemical element with the symbol $$Na$$ and atomic number $$11$$. Atomic mass (u) of sodium = $$23u$$.
It is a soft, silvery-white, highly reactive metal.
Question 2
1 / -0

Definition of chemistry is:

A
physical science that studies the composition, structure, properties and change of matter

B
biological science that helps to study the basic functioning of nervous system

C
science that helps in studying the galaxy

D
physical science that studies the biotic and abiotic aspects of environment

Solution

Chemistry is a branch of physical science that studies the composition, structure, properties and change of matter. Chemistry deals with such topics as the properties of individual atoms, how atoms form chemical bonds to create chemical compounds, the interactions of substances through intermolecular forces that give matter its general properties, and the interactions between substances through chemical reactions to form different substances.

Hence, the correct option is $$A$$
Question 3
1 / -0

What is % composition of a substance?

A
Sum of all the components.

B
% composition of the sum of two components.

C
% of the total mass of a substance.

D
None of the above.

Solution

The percent composition of a component in a compound is the percent of the total mass of the compound that is due to that component.
Question 4
1 / -0

What is the atomic mass (u) of chlorine?

A
34

B
35.5

C
33

D
35

Solution

Chlorine is a chemical element with the symbol Cl and atomic number 17. The second-lightest of the halogens, it appears between fluorine and bromine in the periodic table and its properties are mostly intermediate between them.

The atomic mass (u) of Chlorine is 35.5u.
Question 5
1 / -0

The unit, mole, was accepted in the year?

A
1962

B
1965

C
1967

D
1969

Solution

The term 'mole' was introduced around 1896 by Wilhelm Ostwald. But, it was accepted as a unit to report the large number of atoms and molecules in 1967.
Question 6
1 / -0

What is chemistry?

A
Study of substances.

B
Investigation of reactions and properties.

C
Study of reactions to form new substances.

D
All of the above.

Solution

Chemistry can be defined in many ways as it is study of substance, investigation of reactions and properties and also the study of reactions to form new substance.
Question 7
1 / -0

French chemist ____ laid the foundation to the scientific investigation of matter by describing that substances react by following certain laws.

A
Dalton

B
Rutherford

C
Antony van Leeuwenhoek

D
A. Lavoisier

Solution

With the development of more precise ideas on elements, compounds and mixtures, scientists began to investigate how and why substances react. French chemist A. Lavoisier laid the foundation to the scientific investigation of matter by describing that substances react by following certain laws. These laws are called the laws of chemical combination. These eventually formed the basis of Dalton's Atomic Theory of Matter.
Question 8
1 / -0

Find the total number of pennies in a tenth of a mole of pennies.

A
$$6.02 \times 10^{23}$$ pennies

B
10 pennies

C
$$6.02 \times 10^{22}$$ pennies

D
0.1 pennies

E
1 penny

Solution

Number of pennies in one mole of pennies $$=6.02\times10^{23}$$ (Avogadro's number)
Therefore, total number of pennies in a tenth of a mole of pennies $$=\dfrac{1}{10}\times 6.02\times10^{23}=6.02\times10^{22}$$ pennies
Question 9
1 / -0

Chemistry is sometimes called as:

A
Biological Science

B
Central Science

C
Biochemistry

D
Both A and C

Solution

Chemistry is sometimes called as Central Science because it bridges other natural sciences, including physics, geology and biology.
Question 10
1 / -0

Who is called father of modern chemistry ?

A
Antoine Lavoisier

B
Gilbert Lewis

C
Gibbs

D
Otto Hahn

Solution

Antoine Lavoisier is known as the father of modern chemistry.

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Re-Attempt Weekly Quiz Competition

Some Basic Concepts of Chemistry Test - 17

Result

Some Basic Concepts of Chemistry Test - 17

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SHARING IS CARING

Question 1

22

23

23.5

24

Solution

Question 2

physical science that studies the composition, structure, properties and change of matter

biological science that helps to study the basic functioning of nervous system

science that helps in studying the galaxy

physical science that studies the biotic and abiotic aspects of environment

Solution

Question 3

Sum of all the components.

% composition of the sum of two components.

% of the total mass of a substance.

None of the above.

Solution

Question 4

34

35.5

33

35

Solution

Question 5

1962

1965

1967

1969

Solution

Question 6

Study of substances.

Investigation of reactions and properties.

Study of reactions to form new substances.

All of the above.

Solution

Question 7

Dalton

Rutherford

Antony van Leeuwenhoek

A. Lavoisier

Solution

Question 8

$$6.02 \times 10^{23}$$ pennies

10 pennies

$$6.02 \times 10^{22}$$ pennies

0.1 pennies

1 penny

Solution

Question 9

Biological Science

Central Science

Biochemistry

Both A and C

Solution

Question 10

Antoine Lavoisier

Gilbert Lewis

Gibbs

Otto Hahn

Solution

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