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- 1. Multiple Choice
Which of the following metals can be cut with a knife?
[more than one answer]
sodium
magnesium
potassium
calcium
- 2. Multiple Choice
Which of the following metal is used as flares and camera flushbulbs?
aluminium
potassium
magnesium
calcium
- 3. Multiple Choice
Which metal is suitable to make the object as in the diagram?
calcium
iron
zinc
silver
- 4. Multiple Choice
Based on the diagram, the ship's bodies had covered with rust as it was always exposed to air and oxygen. Which of the following can be done to cover the rusting process?
Use a nitrogen to slow down the chemical reaction
Coat the bodies with zinc in a process called zinc plating
Change the bodies by using zinc that does not corrode in the air
Coat with sulfur as it does not dissolve in water
- 5. Multiple Choice
Why is copper particularly useful in electrical circuits?
does not corrode in air
very reactive metal
a very good conductor of heat
support burning
- 6. Multiple Choice
Which gases can burn in air?
oxygen
hydrogen
nitrogen
helium
- 7. Multiple Choice
- a colourless, odourless gas
- does not allow things to burn in it
- slows down the chemical reaction
The features above best describe
helium
mercury
bromine
nitrogen
- 8. Multiple Choice
Why is helium used in airships?
It can burn in air
It is less dense than air
It does not dissolve in water
It can conducts electricity
- 9. Multiple Choice
Which of the following are true about bromine?
[more than one answer]
produce a toxic fumes with an unpleasant smell
used in making flame retardants
it is red brown liquid which soluble in water
it can burns in air to produces oxide
- 10. Multiple Choice
Which metals have the highest density but the lowest melting and boiling point?
iron
zinc
mercury
silver
- 11. Multiple Choice
Which metal has the highest melting and boiling point?
sodium
iron
zinc
mercury
- 12. Multiple Choice
Carbon (graphite) has the highest ______________ between the common non-metals you've learned.
density
density and melting point
melting point
melting and boiling
- 13. Multiple Choice
Which of the following happens when sodium reacts with chlorine?
[more than one answer]
sodium chloride produced
sodium sulfide produced
bright light and white solid compound
bright light and black solid compound
- 14. Multiple Choice
calcium + oxygen ---> _____________
calcium dioxide
calcium oxygen
calcium oxide
calcium carbonate
- 15. Multiple Choice
What happens when sulfur is heated?
combine with oxygen and produces sulfuric acid
combine with oxygen and produce sulfur dioxide
combine with oxygen and produce sulfur oxide
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