Test Preparation grade8

1.      All of these processes are dissolving process, except…

• Andy stirs sugar in a glass full of water

• Aiko stirs salt in a glass full of water

• Veronica swaps her nail polish with nail polish remover

• Harry burns the candle

If you keep adding a soluble solid to a beaker of water, there comes a point where no more of the solid will dissolve. You have made a….

• Concentrated solution

• Dilute solution

• Saturated solution

• Insoluble solution

Metals which are generally unreactive can be said as….

• Metalloid

• Anti-reactionist

• Inert

• Solvent

Which metals that are very unreactive with anything, even we said it as noble metals?

• Gold, silver, platinum

• Gold, copper, iron

• Gold, iron, sodium

• Silver, magnesium, aluminium

Iron + Oxygen >> ….

Sodium + Water >> … + …

… + Hydrochloric acid >> Potassium chloride + …

Sodium hydroxide + … >> Sodium nitrate + …