CHEMISTRY REVISION

What is the properties of solid?

• closely packed, moving, cannot be compressed

• there is gap, moving, can compressed

• closely packed, vibrates, cannot be compressed

• there is gap, vibrates, cannot be compressed

Define diffusion

• random movement of particles

• random movement of particles from high concentration to low concentration

• Particles moving towards high concentration

Following are the properties of metals except...

• malleable

• sonorous

• hard

• brittle

Choose the correct group of metals

• Potassium, Mercury, Gold

• Silver, Carbon, Gold

• Calcium, Mercury, Silicon

• Iron, Sulfur, Copper

Which technique will be used to separate mixture of liquids?

• evaporation

• fractional distillation

• filtration

• chromatography

What is produced when acid react with metals?

• salt + water

• salt + oxygen

• salt + carbon dioxide + water

• salt + hydrogen

Construct chemical formula for calcium sulfate

• CaS

• CaSO₄

• CuSO₄

• CuS

Which one of the following is an endothermic reaction?

• burning

• neutralisation

• combustion

• photosynthesis

Which element is needed for rusting to occur?

• water

• sulfur

• carbon dioxide

• oxygen

Which chemical equation is correct and balanced?

• Na + O --> NaO

• 2Na + O --> Na₂O

• 2Na + O₂ --> 2NaO

• 4Na + O₂ --> 2Na₂O