Simple Molecules & Covalent Bonding quiz

1. Describe the chemical test for water

Add it to anhydrous potassium permanganate which will turn from white to purple if water is present

Find the boiling point. If it is 100 ⁰C water is present

Find the melting point. If it is 0 ⁰C then water is present

Add it to anhydrous copper(II) sulfate which will change from white to blue if water is present

Question 1 of 16

2. Explain why nitrogen gas, N₂, is a gas at room temperature

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

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

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

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

Question 2 of 16

3. What are the two parts of an atom?

The nucleus and the electron cloud

The centre and the electron shells

The outside and inside

The nucleus and the electron shells

Question 3 of 16

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

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

A shared pair of electrons is attracted to one nucleus

Question 4 of 16

5. Describe the test for oxygen gas

Use a glowing splint and see if it relights

Use a lit splint to see if the gas pops

Turns moist litmus paper white (bleaches)

Bubble the gas through limewater and see if it goes cloudy

Question 5 of 16

6. What is the atomic number of a chlorine atom?

35.5

17

32

18

Question 6 of 16

7. What is the total number of atoms in the formula Be(OH)₂ ?

3

2

4

5

Question 7 of 16

8. How many electrons in the outer shell of group 5 elements?

6

4

5

8

Question 8 of 16

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

Isotopes have different masses

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

Isotopes are radioactive

Isotopes have the same number of electrons

Question 9 of 16

10. In the dot and cross diagram of the outer electrons showing the covalent bonding of ammonia (NH₃), how many electrons should be shown in areas 1, 2, 3 and 4?

There should be one electron in each of the areas 1, 2, 3 and seven electrons in 4

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

There should be one electron in each of the areas 1, 2, 3 and five electrons in 4

There should be 2 electrons in each of the areas 1, 2, 3 but none in 4

Question 10 of 16

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

A Group is a vertical column of similar elements

A Group is a horizontal row of elements

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

A Group is a collection of similar elements

Question 11 of 16

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

Group 2, alkaline earth metals

Group 1, the alkali metals

Group 0, the noble gases

Group 7, the halogens

Question 12 of 16

13. Do larger molecules have higher or lower boiling points than smaller molecules?

Lower

Higher

It depends on which atoms are present

Size doesn\'t affect boiling point

Question 13 of 16

14. Where are metals found on the periodic table?

Only in the left hand column

On the left, reaching across the middle

At the top right

Only on the bottom row

Question 14 of 16

15. Describe the formation of a covalent bond

The sharing of a pair of electrons between two nuclei

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

The transfer of electrons from one atom to another

The sharing of a single electron between two nuclei

Question 15 of 16

16. 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 inner shell

Same electronic configuration

same number of electrons in the outer shell

same number of electron shells

Question 16 of 16

Simple Molecules & Covalent Bonding quiz

Simple Molecules & Covalent Bonding quiz

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