Chem Paper 1 revision (AQA)

Calculate the mean temperature change.

Do not include the anomalous result in your calculation.

The chart shows the proportion of elements in the periodic table that are metals and non-metals. Determine the percentage of the elements in the chart that are metals.

What order did scientists use to arrange elements in early periodic tables?

• Atomic mass of element

• Number of neutrons in an atom of element

• Size of atoms of element

• Year element was discovered

In early periodic tables some elements were placed in the wrong groups.

Mendeleev overcame some of these problems in his periodic table.

Complete the sentence.

Mendeleev did this by leaving ................................. for elements that had not

been discovered.

What is the name of the group that contains argon?

• Alkali metals

• Halogens

• Noble gases

Which group in the periodic table is known as the halogens?

• 1

• 2

• 7

• 0

What holds the particles together in sodium chloride?

• Electrostatic attractions

• Intermolecular forces

• Metallic bonds

Solid sodium chloride does not conduct electricity.

Choose the TWO ways in which sodium chloride can be made to conduct electricity.

• Heat strongly to melt it

• Dissolve in water

• Bash it up into small pieces

• Add to an acid

Sodium chloride (NaCl) is an ionic compound.

Choose the symbol for the sodium ion.

• Na⁺

• Na²⁺

• Na^-

• Na^2-

Chlorine reacts with potassium bromide solution to form potassium chloride and bromine. What type of reaction is this?

• Displacement

• Thermal decomposition

• Neutralisation