Simple Molecules & Covalent Bonding quiz

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

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

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

Question 1 of 16

2. What is the atomic number of an argon atom?

40

22

20

18

Question 2 of 16

3. Explain why carbon dioxide gas, CO₂, is a gas at room temperature

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

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

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

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

Question 3 of 16

4. What colour is anhydrous copper (II) sulfate?

Cream

White

Purple

Blue

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 pair of electrons is transferred from bromine to hydrogen

A single electron is transferred from bromine to hydrogen

A shared pair of electrons is attracted to 2 nuclei

Question 5 of 16

6. In the test of a gas, a lit splint gives a squeaky pop. What is the gas?

Oxygen

Carbon dioxide

Hydrogen

Chlorine

Question 6 of 16

7. State the mass and charge of a proton

Proton: mass=1, charge=0

Proton: mass=negligible, charge=+1

Proton: mass=1, charge=+1

Proton: mass=1, charge=-1

Question 7 of 16

8. How many electrons in a sodium atom?

11

23

12

10

Question 8 of 16

9. What is meant by the term molecule?

A molecule is found in the nucleus of an atom

A molecule is the smallest part of an element

A molecule contains at least three atoms

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

Question 9 of 16

10. On the Periodic Table what is the meaning of the word Period?

A Period is a vertical column of similar elements

A Period is a collection of elements with the same number of electrons in the outer shell

A Period is a horizontal row of elements

A Period is a collection of similar elements

Question 10 of 16

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

Only in the left hand column

On the left, reaching across the middle

Only on the bottom row

At the top right, plus hydrogen

Question 11 of 16

12. Describe the formation of a covalent bond

The sharing of a pair of electrons 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 single electron between two nuclei

Question 12 of 16

13. In the dot and cross diagram of the outer electrons showing the covalent bonding in a molecule of water (H₂O), how many electrons should be shown in areas 1, 2, 3 and 4?

There should be four electrons in each of areas 1 and 2, and zero electrons in areas 3 and 4.

There should be two electrons in each of areas 1 and 2, and zero electrons in areas 3 and 4.

There should be two electrons in each of areas 1 and 2, and two electrons in each of areas 3 and 4.

There should be two electrons in each of areas 1 and 2, and zero electrons in areas 3 and 4. There should also be an additional 4 electrons around the outside of the oxygen atom.

Question 13 of 16

14. On the Periodic Table what is the meaning of the word Period? What does that tell us about the electron configuration of the atom?

same number of electrons in the outer shell

Same electronic configuration

same number of electron shells

Same number of electrons in the inner shell

Question 14 of 16

15. 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 have different masses

Isotopes are radioactive

Isotopes have the same number of electrons

Question 15 of 16

16. Which group of atoms has a full outer shell?

Group 7, the halogens

Group 1, the alkali metals

Group 0, the noble gases

Group 2, alkaline earth metals

Question 16 of 16

Simple Molecules & Covalent Bonding quiz

Simple Molecules & Covalent Bonding quiz

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