Atoms and Molecules Test

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Atoms and Molecules Test - 22

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Weekly Quiz Competition

Question 1
1 / -0

Which scientist suggested that the symbols of elements should be made of one or more letters of the names of the elements?

A
Dalton

B
Rutherford

C
Lavoisier

D
Berzelius

Solution

Berzelius was the scientist who suggested that the symbols should be made of the first or first two letters of the names of the elements.
Hence, the correct option is $$D$$.
Question 2
1 / -0

Who laid the foundation of chemical sciences by experimentally establishing laws of chemical combination along with other scientists?

A
Proust

B
Antoine Lavoisier

C
Dalton

D
None of the above

Solution

Lavoisier was the first one who established important laws of chemical combination.

Hence, the correct option is B.
Question 3
1 / -0

The term mole is a latin word which means:

A
bunch

B
heap or pile

C
herd

D
flock

Solution

Mole is a Latin word which means heap or pile.
Question 4
1 / -0

A negatively charged ion in a compound is called a/an:

A
electron

B
valency

C
cation

D
anion

Solution

The negatively charged ion is known as anion.
For example, $$Cl^-$$ is the anion of a chlorine atom and we called it a chloride ion.
Question 5
1 / -0

The word mole was introduced by ______ in _______.

A
Avogadro, 1897

B
Dalton, 1896

C
Wilhelm Ostwald, 1896

D
Proust, 1897

Solution

The word mole was introduced by Wilhelm Ostwald in 1896. It's the S.I. unit to measure the amount of substance or particles denoted by the symbol 'mol'.
Question 6
1 / -0

One mole is equal to number of atoms as contained in:

A
1 g of carbon

B
6 g of carbon

C
12 g of carbon

D
12 kg of carbon

Solution

One mole is equal to number of atoms as contained in 12 g of carbon, i.e. 6.022$$\times$$10$$^{23}$$ atoms.
Question 7
1 / -0

One mole is defined as:

A
quantity having a mass equal to its atomic/molecular mass.

B
quantity having mass equal to half of its atomic/molecular mass.

C
one gram of any quantity.

D
one kilogram of any quantity.

Solution

One mole is defined as a quantity having a mass equal to its atomic/molecular mass.
For example, one mole sodium$$(Na) = 23 \ gm = $$ atomic mass of sodium
Question 8
1 / -0

Atoms of same element combines to form:

A
molecules

B
ions

C
large atoms

D
compounds

Solution

If two or more atoms of the same element combine, they produce a molecule.
for example: $$H_2, O_3$$
Hence, the correct option is A.
Question 9
1 / -0

In the formation of iron sulphide, by heating iron and sulphur, the mass of iron(II) sulphide __________ when compared with a total mass of iron and sulphur.

A
increases

B
decreases

C
remains same

D
None of the above

Solution

According to the law of conservation of mass, the total mass of reactants is equal to the total mass of products in a chemical reaction.
$$Fe + S \rightarrow FeS$$
The total mass of $$Fe$$ and $$S$$ = Total mass of iron sulphide
Option $$C$$ is correct.
Question 10
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.

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Atoms and Molecules Test - 22

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Atoms and Molecules Test - 22

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Question 1

Dalton

Rutherford

Lavoisier

Berzelius

Solution

Question 2

Proust

Antoine Lavoisier

Dalton

None of the above

Solution

Question 3

bunch

heap or pile

herd

flock

Solution

Question 4

electron

valency

cation

anion

Solution

Question 5

Avogadro, 1897

Dalton, 1896

Wilhelm Ostwald, 1896

Proust, 1897

Solution

Question 6

1 g of carbon

6 g of carbon

12 g of carbon

12 kg of carbon

Solution

Question 7

quantity having a mass equal to its atomic/molecular mass.

quantity having mass equal to half of its atomic/molecular mass.

one gram of any quantity.

one kilogram of any quantity.

Solution

Question 8

molecules

ions

large atoms

compounds

Solution

Question 9

increases

decreases

remains same

None of the above

Solution

Question 10

Dalton

Rutherford

Antony van Leeuwenhoek

A. Lavoisier

Solution

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