Exam Questions

Question 1

Describe an atom fully (6 marks)

Answer 1

An atom consists of 3 subatomic particles - protons, electrons and neutrons . An atom has an overall charge of 0 because protons have a positive charge , electrons have a negative charge and neutrons have no charge. In the centre of the atom there is a nucleus that consists of neutrons and protons . There is the same amount of protons and electrons. Most of the mass of an atom is concentrated into the nucleus. The nucleus has a positive charge. Around the nucleus are electrons which are configured into shells.The nucleus is very small compared to the size of an atom

Question 2

Similarities and differences of lithium and sodium’s reaction with water

Answer 2

Similarities: floats , fizzes , bubbles , dissolves , leaves alkaline solution in water , produces hydrogen in the sodium hydroxide + hydrogen
Differences
Sodium has a more vigorous reaction and sodium will light on fire (yellow flame )

Question 3

Compare chemical and physical properties of transition elements and the alkali metals

Answer 3

Group 1 alkali metals
Low density , soft , high reactivity, low melting and boiling points, only forms 1+ ions , can’t be used as a catalyst but transition metals can . Has one outer electron
Transition metals
Hard strong , high melting and boiling points, high density, not reactive , catalysts (increases the rate of reaction without being used up itself

Question 4

When metals react with non metals they form

Answer 4

Ions

Question 5

Compounds formed by only non metals consist of ?

Answer 5

Molecules