Simple Molecules & Covalent Bonding quiz

1. In the dot and cross diagram of the outer electrons showing the covalent bonding in a molecule of nitrogen (N₂), how many electrons should be shown in areas 1, 2 and 3?

There should be two electrons in area 1, six electrons in area 2, and two electrons in area 3

There should be three electrons in area 1, four electrons in area 2, and three electrons in area 3

There should be four electrons in area 1, two electrons in area 2, and four electrons in area 3

There should be two electrons in area 1, four electrons in area 2, and two electrons in area 3

Question 1 of 16

2. What is special about the elements in group 0?

They are all coloured gases

They are very unreactive (because they have full outer electron shells)

They have the same number of electrons

They are all diatomic

Question 2 of 16

3. Where are non-metals found on the periodic table?

On the left, reaching across the middle

Only in the left hand column

At the top right, plus hydrogen

Only on the bottom row

Question 3 of 16

4. Which gas will turn damp red litmus paper blue?

Carbon dioxide

Chlorine

Hydrogen

Ammonia

Question 4 of 16

5. Explain how the atoms are held together in a hydrogen bromide molecule

A shared pair of electrons is attracted to one nucleus

A single electron is transferred from bromine to hydrogen

A pair of electrons is transferred from bromine to hydrogen

A shared pair of electrons is attracted to 2 nuclei

Question 5 of 16

6. On the Periodic table what is the meaning of the word Group? What does that tell us about the electron configuration of the atom?

Same number of electrons in the inner shell

Same electronic configuration

Same number of electron shells

same number of electrons in the outer shell

Question 6 of 16

7. On the Periodic table what is the meaning of the word Group?

A Group is collection of elements with the same number of electron shells

A Group is a vertical column of similar elements

A Group is a horizontal row of elements

A Group is a collection of similar elements

Question 7 of 16

8. Explain, in terms of electrons, why isotopes have the same chemical properties

Isotopes have the same number of protons but a different number of neutrons

Isotopes are radioactive

Isotopes have different masses

Isotopes have the same number of electrons

Question 8 of 16

9. What colour is hydrated copper (II) sulfate?

Cream

Purple

White

Blue

Question 9 of 16

10. Which particle(s) in an atom has a positive charge?

Electron

Protons and electrons

proton

Neutron

Question 10 of 16

11. How many electrons in a nitrogen atom?

7

14

8

6

Question 11 of 16

12. Why is the melting point of a smaller molecule lower than that of a larger molecule?

Larger molecules have fewer attractions between them. These take less energy to overcome.

Larger molecules have more attractions between them. These take less energy to overcome.

Larger molecules have fewer attractions between them. These take more energy to overcome.

Larger molecules have more attractions between them. These take more energy to overcome.

Question 12 of 16

13. How many protons in a hydrogen atom?

2

0

0.5

1

Question 13 of 16

14. What is meant by the term molecule?

A molecule is made of a fixed number of two or more atoms covalently bonded together

A molecule contains at least three atoms

A molecule is the smallest part of an element

A molecule is found in the nucleus of an atom

Question 14 of 16

15. Explain why methane gas, CH₄, is a gas at room temperature

Methane has a giant covalent structure with many weak covalent bonds which require little energy to overcome

Methane has a simple molecular structure with weak intermolecular forces that require little energy to overcome

Methane has a simple molecular structure with strong intermolecular forces that require a lot of energy to overcome

Methane has a giant covalent structure with many strong covalent bonds which require a lot of energy to overcome

Question 15 of 16

16. Describe the formation of a covalent bond

The sharing of a single electron between two nuclei

The transfer of electrons from one atom to another

The electrostatic attraction between positive metal ions and a sea of delocalised electrons

The sharing of a pair of electrons between two nuclei

Question 16 of 16

Simple Molecules & Covalent Bonding quiz

Simple Molecules & Covalent Bonding quiz

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