Some Basic Concepts of Chemistry Test

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Some Basic Concepts of Chemistry Test - 18

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Weekly Quiz Competition

Question 1
1 / -0

Which is the 1$$^{st}$$ organic compound synthesized in lab?

A
Urea

B
Methanol

C
Ammonia

D
Sulphuric Acid

Solution

It is widely accepted that urea is the first organic compound to be synthesized from inorganic chemicals. In 1828, the German chemist Friedrich Wöhler obtained urea artificially by treating silver cyanate with ammonium chloride
Question 2
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The laws of chemical combination formed on the basis of :

A
Dalton's atomic theory

B
Dalton's mass theory

C
Both A and B

D
None of the above

Solution

Before Dalton, the concept of the atom was not concrete. Dalton explained atoms based on the laws of chemical combinations. When substances react, they do so by following certain laws. These laws are called the laws of chemical combination. These laws formed the basis of Dalton's atomic theory.
Question 3
1 / -0

Chemical hypothesis first emerged in Classical Greece by:

A
Einstein

B
Louis Pasteur

C
Aristotle

D
Leuweenhock

Solution

A basic chemical hypothesis first emerged in Classical Greece with the theory of four elements as propounded definitively by Aristotle stating that the fire, air, earth and water were the fundamental elements.

Everything is formed from a combination of two or more of these elements.

Hence, option C is correct.
Question 4
1 / -0

Branch of chemistry deals with structure of matter, the energy changes and theories, laws and principles that explain the transfer motion of matter for one form to another is known as :

A
Physical chemistry

B
Inorganic chemistry

C
Organic chemistry

D
Analytical chemistry

Solution

Physical chemistry deals with structure of matter, the energy changes and theories, laws and principles which explains the transfer motion of matter from one form to another.
Question 5
1 / -0

Who is considered as the founding father of chemistry?

A
Boyle

B
Aristotle

C
Sir Francis

D
John Mayow

Solution

Boyle, in particular, is regarded as the founding father of chemistry due to his most important work, the classic chemistry text - "The Sceptical Chymist" (1661), where the differentiation is made between the claims of Alchemy and the empirical scientific discoveries of the new chemistry.

He formulated Boyle's law, rejected the classical "four elements" and proposed a mechanistic alternative of atoms and chemical reactions that could be subjected to rigorous experiments.
Question 6
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Which statement is linked with the idea that two identical containers filled with different gases will contain the same number of particles?

A
Mosely

B
Avagadro

C
Dalton

D
Mendeleev

Solution

Avagadro stated that when two identical containers are filled with different gases at same pressure and temperature, they contain same number of particles.
So, the statement is linked with Avagadro.
Question 7
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Which of the following statements is the most accurate with regard to the significance of Avogadro's number, $$6.02 \times 10^{23}$$ ?

A
It is the conversion factor between grams and atomic mass units.

B
It is a universal physical constant just as the speed of light.

C
It is the number of particles that is required to fill a $$1\ L$$ container.

D
It is the inverse diameter of an $$H$$ atom .

Solution

A carbon atom weighs 12 AMU, one AMU is equivalent to $$1.66 \times 10^{-24}$$ grams. Conversely, one gram is equivalent to $$6.022 \times 10^{23}$$ AMU, which is called Avogadro's number

so the answer is A
Question 8
1 / -0

A sample of ammonia has a mass of $$51.1g$$. How many molecules are in this sample?

A
$$1.8\times {10}^{23}$$ molecules

B
$$3.6\times {10}^{23}$$ molecules

C
$$9.1\times {10}^{23}$$ molecules

D
$$1.8\times {10}^{24}$$ molecules

Solution

given mass of ammonia is 51.1g
in this number of moles = $$\dfrac{51.1}{17.031}$$ = 18
Now in a mole, there are Na molecules, this is known $$6.023\times 10^{23}$$
since 1 mol = $$6.023\times 10^{23}$$

thus,

18 mol = $$18\times 6.023\times 10^{23}$$ = $$1.8\times 10^{24}$$
Question 9
1 / -0

Which term describes the mass of $$6.022\times { 10 }^{ 23 }$$ representative particles?

A
Molar mass

B
Avogadro's number

C
Empirical formula

D
Molecular formula

Solution

Molar mass of a compound describes the total mass of $$6.023 \times 10^{23}$$ atoms or particles of the compound.
Ex: Molar mass of $$H_2 = 2\space g$$
Question 10
1 / -0

All gases have the same number of moles in the same volume at constant temperature and pressure.

A
Boyle's Law

B
Charles's Law

C
Avogadro's Principle

D
Ideal Gas Law

Solution

According to the Avogadro's principal, every gas have the same number of moles in the same volume at constant temperature and pressure.

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Some Basic Concepts of Chemistry Test - 18

Result

Some Basic Concepts of Chemistry Test - 18

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Question 1

Urea

Methanol

Ammonia

Sulphuric Acid

Solution

Question 2

Dalton's atomic theory

Dalton's mass theory

Both A and B

None of the above

Solution

Question 3

Einstein

Louis Pasteur

Aristotle

Leuweenhock

Solution

Question 4

Physical chemistry

Inorganic chemistry

Organic chemistry

Analytical chemistry

Solution

Question 5

Boyle

Aristotle

Sir Francis

John Mayow

Solution

Question 6

Mosely

Avagadro

Dalton

Mendeleev

Solution

Question 7

It is the conversion factor between grams and atomic mass units.

It is a universal physical constant just as the speed of light.

It is the number of particles that is required to fill a $$1\ L$$ container.

It is the inverse diameter of an $$H$$ atom .

Solution

Question 8

$$1.8\times {10}^{23}$$ molecules

$$3.6\times {10}^{23}$$ molecules

$$9.1\times {10}^{23}$$ molecules

$$1.8\times {10}^{24}$$ molecules

Solution

Question 9

Molar mass

Avogadro's number

Empirical formula

Molecular formula

Solution

Question 10

Boyle's Law

Charles's Law

Avogadro's Principle

Ideal Gas Law

Solution

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