Atoms and Molecules Test

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Atoms and Molecules Test - 24

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Weekly Quiz Competition

Question 1
1 / -0

Cations carry a ___________ charge.

A
positive

B
negative

C
no charge

D
none of these

Solution

$$(A)$$ positive
The cation is an ion that carries a positive charge, causing it to migrate to the cathode during the electrolysis of salts. It has more protons than electrons, resulting in a positive charge.
Question 2
1 / -0

The word 'atom' is derived from the Greek word ____________.

A
atomic

B
atomos

C
atomey

D
atomoney

Solution

Greek philosophers such as Democritus and Epicurus suggested that matter is made up of tiny indivisible particles called atoms. The word atom is derived from the Greek word atomos, which means indivisible or uncut.
Question 3
1 / -0

Molecular mass of $$Ca(OH)_2$$ is :

A
$$61$$

B
$$57$$

C
$$74$$

D
None of above

Solution

Molecular mass of $$Ca(OH)_2 = 1$$(Atomic mass of $$Ca$$)$$ + 2$$(Atomic mass of $$O$$) $$+ 2($$Atomic mass of $$H)$$
$$ = 40 + 2(16) + 2(1)$$
$$ = 40 + 32 + 2$$
$$ = 74$$
Question 4
1 / -0

What is a molecule?

A
A group of two or more atoms that are chemically bonded together.

B
Smallest particle into which matter can be divided.

C
The combining power (or capacity) of an element.

D
Both A and B.

Solution

A group of two or more atoms that are chemically bonded together or are tightly held together by attractive forces is known as a molecule.
The smallest particle into which a matter can be divided is known as an atom.
The combining power of an element is known as its valency.

So, the correct option is $$A$$
Question 5
1 / -0

Which one of the following scientist's proposed the law of conservation of mass?

A
J.J. Thomson

B
John Dalton

C
Rutherford

D
Berzelius

Solution

The law of conservation of mass is given by John Dalton which states that mass can neither be created nor be destroyed in a chemical reaction.
option $$B$$ is correct.
Question 6
1 / -0

State the atomic mass of $$H_2O$$?

A
$$16$$ u

B
$$17$$ u

C
$$18$$ u

D
$$15$$ u

Solution

Atomic mass of hydrogen is $$1\ u$$ and oxygen is $$16\ u$$.
Hence molecular mass of water $$(H_2O)=(2\times 1)\ u + 16\ u = 18\ u $$
Option $$C$$ is correct.
Question 7
1 / -0

Hydrogen atom has an approximate diameter of:

A
$$10^{-9}\ m$$

B
$$10^{-10}\ m$$

C
$$9^{-10}\ m$$

D
$$10^{-11}\ m$$

Solution

A hydrogen atom has a diameter of approximately $$1.06 \times {10}^{-10} \; m \approx {10}^{-10} \; m$$, as defined by the diameter of the spherical electron cloud around the nucleus.
Question 8
1 / -0

Gold is an example of a

A
Molecule

B
Element

C
Atom

D
Compound

Solution

Gold is an example of an Element.
Question 9
1 / -0

A symbol of an element represents:

A
one atom of the element

B
one molecule of the element

C
all the atoms of the element

D
all the molecules of the element

Solution

The symbol of an element represents one atom of that element. For example, the symbol 'O' of oxygen represents only one atom of oxygen.
Question 10
1 / -0

When equal masses of methane and sulphur dioxide are taken, then the ratio of their molecules is:

A
1 : 1

B
1 : 2

C
2 : 1

D
4 : 1

Solution

The molecular weights of methane and sulfur dioxide are $$16$$ and $$64$$ respectively. The ratio of their molecules is equal to the ratio of their moles. For equal masses of methane and sulphur dioxide, we know that the number of moles is inversely proportional to the molecular weight.

$$\dfrac { Molecules\quad of\quad CH_4 }{ Molecules\quad of\quad SO_2 } $$ $$=\dfrac { Moles\quad of\quad CH_4\times N_A }{ Moles\quad of\quad SO_2\times N_A } $$

$$=\dfrac { Mol\quad wt.\quad of\quad SO_2 }{ Mol\quad wt.\quad of\quad CH_4 } =\dfrac { 64 }{ 16 } =4:1$$

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Atoms and Molecules Test - 24

Result

Atoms and Molecules Test - 24

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SHARING IS CARING

Question 1

positive

negative

no charge

none of these

Solution

Question 2

atomic

atomos

atomey

atomoney

Solution

Question 3

$$61$$

$$57$$

$$74$$

None of above

Solution

Question 4

A group of two or more atoms that are chemically bonded together.

Smallest particle into which matter can be divided.

The combining power (or capacity) of an element.

Both A and B.

Solution

Question 5

J.J. Thomson

John Dalton

Rutherford

Berzelius

Solution

Question 6

$$16$$ u

$$17$$ u

$$18$$ u

$$15$$ u

Solution

Question 7

$$10^{-9}\ m$$

$$10^{-10}\ m$$

$$9^{-10}\ m$$

$$10^{-11}\ m$$

Solution

Question 8

Molecule

Element

Atom

Compound

Solution

Question 9

one atom of the element

one molecule of the element

all the atoms of the element

all the molecules of the element

Solution

Question 10

1 : 1

1 : 2

2 : 1

4 : 1

Solution

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