G8_Chem_10.2_Book

If you put calcium into water what will happen

• bubbles

• vibrate

• nothing will happen

calcium   +   water   ==>   calcium hydroxide   +   ......

• water

• oxygen

• hydrogen

• nothing

 Magnesium ribbon reacts with cold water.

 The reaction is ..................................

• fast

• slow

zinc react with cold water

• true

• false

zinc react with steam

• true

• false

gold, silver, copper, and tin

all are react with a cold water

• true

• false

 The metals that react vigorously with oxygen also react victoriously with water.

• true

• false

select two metals which react vigorously with water

• potassium

• gold

• sodium

• platinum

Potassium + water ==> ..................... + hydrogen

• ptassium

• potassium and hydrogen

• potassium hydroxide

• all are same

Explain why gold coins stay shiny for hundreds of years

• because it is expensive

• because it doesn't react with water

• because it react only with air

• all are wrong