17 Chemical Reactions 2

Which of the following elements react quickly with cold water?

• Sodium

• Iodine

• Helium

• Hydrogen

What happens when metals react with water?

• Hydrogen gas is formed

• Metal hydroxide and hydrogen gas is formed

• Metal hydroxide is formed

• Metal oxide is formed

When potassium reacts with oxygen in the air what happens?

• it brings out bubbles

• it turns into green

• it will stay the same

• it catches fire

What happens when gold reacts with cold water?

• the gold will melt

• the gold will turn into light yellow

• nothing, the gold can't react with cold water

How can you tell that a metal is reacting with water?

• Colour change
• Bright light
• Fizzing
• It gets colder

What gas is always produced when a metal reacts with water?

• Oxygen
• Carbon dioxide
• Hydrogen
• Carbon monoxide

Which metal is most likely to react with water or acid?

• Copper
• Potassium
• Magnesium
• Iron

What is formed when sodium reacts with water?

• sodium oxide and hydrogen
• sodium hydroxide and hydrogen
• sodium hydroxide and oxygen
• sodium hydroxide and carbon dioxide

What is the state symbol for a solution?

• (S)
• (s)
• (sl)
• (aq)

Which one of the following metals reacts most vigorously with cold water?

• Sodium
• Magnesium
• Copper
• Zinc