Periodic Table- Group 1 and 7

why must the elements in group 1 be stored under oil?

• they react quickly with oxygen in the air

• they are poisonous

• they are very valuable

• dangerous

What would you expect to see when a piece of potassium is placed into a large bowl of water?

• Floats, fizzes, moves around quickly, sparks

• sinks, no reaction

• Floats, moves around slowly

• squeaky pop

How can you tell that the solution left after a Group 1 element has reacted with water is alkaline?

• turns limewater cloudy

• Turns universal indicator purple

• Turns methyl orange red

Why is sodium more reactive than lithium?

• The outer electron is closer to the nucleus, so it is lost more easily

• The outer electron is further from the nucleus, so it is harder to lose

• The outer electron is further from the nucleus, so it is lost more easily

What colour flame is seen when potassium reacts with water?

• Red

• orange

• purple

Which is the most reactive element in Group 7?

• iodine

• chlorine

• fluorine

• bromine

What happens to the melting and boiling points of the halogens as you go down the group?

• increases

• decreases

• stays the same

Which halogen is a liquid at room temperature?

• bromine

• chlorine

• iodine

• fluorine

What will happen when iodine solution is added to a solution of potassium bromide?

• an explosion

• no reaction

• solid iodide is produced

• bromine is produced

In terms of electrons, what happens when something is reduced?

• gains electrons

• loses electrons