Atoms and Molecules Test

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Atoms and Molecules Test - 20

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Weekly Quiz Competition

Question 1
1 / -0

What is the representation of atom of hydrogen and a molecule of hydrogen?

A
$$H$$ and $$H_2$$

B
$$H_2$$ and $$H$$

C
$$H$$ and $$H$$

D
$$H_2$$ and $$H_2$$

Solution

The hydrogen atom is written as $$H$$ and hydrogen molecule is formed by the combination of two hydrogen atoms and is written as $$H_{2}$$.
Question 2
1 / -0

The chemical formula of a particular compound represents:

A
the size of molecule

B
the shape of its molecules

C
the total number of molecules in the compound

D
the number of different types of atoms in its molecule

Solution

The chemical formula of a particular compound represents the number of different types of atoms in its molecule. For instance, the compound $$CO_2$$ (carbon dioxide) has one carbon atom and two oxygen atoms. It does not represent the size or shape of the molecule or the number of molecules in the compound.
Question 3
1 / -0

Law of constant composition is also called as the law of :

A
Conservation of mass

B
Conservation of energy

C
Multiple proportion

D
Definite proportion

Solution

Law of constant composition is also called as the law of Definite proportion which says that the law of constant composition is a chemistry law which states samples of a pure compound always contain the same elements in the same mass proportion.
Question 4
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Which is the smallest possible unit of a chemical compound?

A
Atom

B
Electron

C
Proton

D
Molecule

Solution

The molecule is an electrically neutral group of atoms that represents the smallest possible amount of a chemical compound.
Question 5
1 / -0

A 'mole' of a substance is the same as ________.

A
avogadro's number of particles of the substance

B
the molecule

C
the quantity of substance reacting with 8 parts of oxygen

D
the saturated solution of the substance

Solution

The mole is a unit of measurement for amount of substance. It is defined as the amount of any chemical substance that contains elementary particles e.g. atoms,molecules,ions or electrons. This number is expressed by the Avogadro constant which has value of $${ 6.022\times10 }^{ 23 }$$.
Question 6
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The amount of a chemical substance is reported as _______.

A
mole

B
mass

C
volume

D
density

Solution

Mole $$= \dfrac {Given \ mass \ of \ a \ substance}{Molecular \ mass \ or \ atomic \ mass}$$
Question 7
1 / -0

Which is the lightest element in the universe?

A
Helium

B
Hydrogen

C
Nitrogen

D
Silicon

Solution

$$\text {Hydrogen}$$ is the lightest element in the universe with atomic number $$1$$ and so, it has the simplest atomic structure.
Question 8
1 / -0

The law of conservation of mass was given by :

A
Dalton

B
Proust

C
Lavoisier

D
Berzelius

Solution

The law of conservation of mass was given by Lavoisier.
The Law of Conservation of Mass states that matter can be changed from one form into another, mixtures can be separated or made, and pure substances can be decomposed, but the total amount of mass remains constant.

We can state this important law in another way. The total mass of the universe is constant within measurable limits; whenever matter undergoes a change, the total mass of the products of the change is, within measurable limits, the same as the total mass of the reactants.
Question 9
1 / -0

Which of the following represents Plumbous ion?

A
$$Pb^{+2}$$

B
$$Pb^{+4}$$

C
$$Pb^{+3}$$

D
$$Pb^{+1}$$

Solution

Lead looses 2 electrons when combines with other element.
So Plumbous ion is written as; $$Pb^{2+}$$.
Question 10
1 / -0

Avogadro's number represents the number of atoms in:

A
12 g of $$C^{12}$$

B
320 g of sulphur

C
32 g of oxygen

D
14.3 of sulphur

Solution

Avogadro's number represents the number of atoms in 12 g of $$C^{12}$$

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Atoms and Molecules Test - 20

Result

Atoms and Molecules Test - 20

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SHARING IS CARING

Question 1

$$H$$ and $$H_2$$

$$H_2$$ and $$H$$

$$H$$ and $$H$$

$$H_2$$ and $$H_2$$

Solution

Question 2

the size of molecule

the shape of its molecules

the total number of molecules in the compound

the number of different types of atoms in its molecule

Solution

Question 3

Conservation of mass

Conservation of energy

Multiple proportion

Definite proportion

Solution

Question 4

Atom

Electron

Proton

Molecule

Solution

Question 5

avogadro's number of particles of the substance

the molecule

the quantity of substance reacting with 8 parts of oxygen

the saturated solution of the substance

Solution

Question 6

mole

mass

volume

density

Solution

Question 7

Helium

Hydrogen

Nitrogen

Silicon

Solution

Question 8

Dalton

Proust

Lavoisier

Berzelius

Solution

Question 9

$$Pb^{+2}$$

$$Pb^{+4}$$

$$Pb^{+3}$$

$$Pb^{+1}$$

Solution

Question 10

12 g of $$C^{12}$$

320 g of sulphur

32 g of oxygen

14.3 of sulphur

Solution

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