Group 1 - The alkali metals

What name is given to the elements in Group 1?

• The alkali metals

• The halogens

• The noble gases

Why must the elements in Group 1 be stored under oil?

• They are poisonous

• They are very valuable

• They react quickly with oxygen in the air

What is produced when sodium reacts with water?

• Sodium oxide

• Sodium hydroxide and hydrogen

• Sodium chloride

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

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 into purple

• Turns methyl orange into red

Which half equation shows the process of a potassium atom losing an electron?

• K → K²⁺ + 2e^-

• K⁺ + e^- → K

• K → K⁺ + e^-

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 are the products of this equation: 2Na + 2H₂O →...

• 2NaH + O₂

• 2NaOH + H₂

• Na₂O₂ + 2H₂

What colour flame is seen when potassium reacts with water?

• Lilac

• Red

• Orange

What hazard symbol might you see on sodium hydroxide or potassium hydroxide?

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