1. Underline the correct answers.
(i) Which of the following could not be predicted about caesium, based on the trends seen
in Group 1 metals?
(2 marks)
A. It is soft
B. It has a relatively high melting point
C. It is very reactive
D. It has a relatively low density
(ii) This question is about the reaction between sodium and water.
(2 marks)
Which statement about this reaction is correct?
A. Sodium sinks to the bottom of the water
B. A lilac flame is seen
C. A solution of sodium oxide is produced
D. Bubbles of hydrogen gas are produced
(iii) Sodium and rubidium have similar chemical properties because their atoms.
(2 marks)
A. Form positive ions
B. Have the same number of electrons in their outer shell
C. Have the same electronic configuration
D. Readily gain electrons
2. This question is about some of the Group 1 alkali metals and their reactions.
i) Complete the sentence to describe a characteristic reaction of the Group 1 elements. (4 marks)
Group 1 elements react with _________________ to form _________
_________and hydrogen.
ii) Solid lithium reacts with cold water to form an aqueous solution of lithium hydroxide
and hydrogen gas.
Lithium + water → lithium hydroxide + hydrogen
Write the balanced chemical equation for the reaction of lithium with water.
(4 marks)
________________________________________________________________________________
b. Place the following Group 1 metals in order from least to most reactive.
Caesium
Lithium
(4 marks)
Potassium
Sodium
c. A small piece of potassium is added to a large volume of water in a trough. Give one observation
that is made when potassium is added to water that is not made when sodium is added to water.
_________________________________________________________________________________
_________________________________________________________________________________
_________________________________________________________________________(2 marks)
3. (i) This question is about lithium and chlorine. Which group of the Periodic Table is chlorine in?
________________________________________________________________________(1 mark)