Question 1

Which sentence describes where electrons are found in an atom?

Accepted Answer

Electrons are found in shells or levels around the nucleus.

Answer

Electrons are found in the space between the shells and the nucleus.

Answer

Electrons are found in the nucleus at the centre of the atom.

Answer

Electrons are found in the nucleus on the outside of an atom.

Question 2

What would be the best way to get pure water from salt solution?

Accepted Answer

crystallisation

Answer

simple distillation

Answer

dissolving followed by filtration

Answer

chromatography

Question 3

The diagram shows a chromatography experiment. What is X?

Accepted Answer

solvent front

Answer

solvent

Answer

coloured dye

Answer

pencil line

Question 4

The table shows the relative charge and mass of some subatomic particles.  Which row represents the correct charge and mass of a proton?

Accepted Answer

D

Answer

B

Answer

A

Answer

C

Question 5

Which is the correct electron arrangement for sodium?

Accepted Answer

2,8,1

Answer

2,8,8,1

Answer

2,8,8

Answer

2,1

Question 6

What is the correct number of protons, neutrons and electrons in a lithium atom? The mass number for lithium is 7 and the atomic number is 3.

Accepted Answer

3 protons, 4 neutrons, and 3 electrons

Answer

3 protons, 3 neutrons, and 4 electrons

Answer

4 protons, 3 neutrons, and 4 electrons

Question 7

What terms can be used to describe this diagram?

Accepted Answer

A molecule and a compound

Answer

An atom and a molecule

Answer

A molecule and an element

Answer

An atom and a compound

Question 8

Which electronic structure is correct?

Accepted Answer

carbon atom (atomic number 6 and mass number 12): 2,8,2

Answer

aluminum atom (atomic number 13 and mass number 27): 2,8,3

Answer

sodium atom (atomic number 11 and mass number 23): 2,9

Answer

oxygen atom (atomic number 8 and mass number 16): 2,8,6

Question 9

What did Rutherford conclude from Geiger and Marsden’s experiment?

Accepted Answer

Most of the atom is empty space and at the centre is a small nucleus with an overall positive charge

Answer

None of the atom is empty space and at the centre is a small nucleus with an overall neutral charge.

Answer

None of the atom is empty space and at the outer edge is a small nucleus with an overall positive charge.

Answer

Most of the atom is empty space and at the centre is a large nucleus with an overall neutral charge.

Question 10

Which equation is correctly balanced?

Accepted Answer

4Fe + 3O$_2$ → 2Fe$_2$O$_3$

Answer

2H$_2$O$_2$ → 2H$_2$O + 2O$_2$

Answer

2C$_6$H$_12$O$_6$ → 2C$_2$H$_5$OH + 2CO$_2$

Answer

2Li + 2H$_2$O → 2LiOH + 2H$_2$

Question 11

How many molecules of hydrogen and oxygen are needed to form two molecules of water? The formula for hydrogen is H$_2$, oxygen O$_2$ and water H$_2$O.

Accepted Answer

2 molecules of hydrogen and 1 molecule of oxygen

Answer

1 molecule of hydrogen and 1 molecule of oxygen

Answer

2 molecules of hydrogen and 2 molecules of oxygen

Answer

1 molecule of hydrogen and 2 molecules of oxygen

Question 12

What is the correct electronic structure for nitrogen?

Accepted Answer

2,5

Answer

2,8,4

Answer

7

Answer

2,7

Question 13

What are the correct number of electrons for an ion of oxygen O$_2$ and an ion of magnesium Mg2+?

Accepted Answer

O$_2$ ion 10 electrons, Mg$^2$$^+$ ion 10 electrons

Answer

O$_2$ ion 8 electrons, Mg$^2$$^+$ ion 12 electrons

Answer

O$_2$ ion 12 electrons, Mg$^2$$^+$ ion 8 electrons

Answer

O$_2$ ion 6 electrons, Mg$^2$$^+$ ion 14 electrons

Question 14

Which of the following is a true statement about isotopes of carbon?

Accepted Answer

They have different numbers of neutrons.

Answer

They have different numbers of protons.

Answer

They have different chemical properties.

Answer

Isotopes contain the same number of protons but they have different numbers of electrons.

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