Sains form 3 revision (2)

The position of a metal in the reactivity series of metals depends on the reactivity of the metal when reacting with ....

• Carbon

• Hydrogen

• Oxygen

• Sulphur

Aluminium is more reactive than ....

• Calcium and Zinc

• Sodium and Gold

• Magnesium and Copper

• Lead and Iron

Based on the following diagram, what is the function of potassium manganate (VII) crystals in this experiment?

• To supply oxygen

• To avoid the metals to mix with each other

• To release heat

• To give out water vapour

Complete the word equation below.

Magnesium + oxygen --> .....

• Magnesium

• Magnesium oxide

• Oxides

• Magnesium oxide + water

Hydrogen is more reactive than the following metals except .....

• Lead

• Copper

• Aluminium

• Mercury

Choose the correct sequence.

.............. , ............ , .........

----------------------------------->

Reactivity towards oxygen increases

• Silver , Copper , Tin

• Iron , Lead , Mercury

• Magnesium , Aluminium , Calcium

• Iron , Carbon , Lead

In an endothermic reaction, energy is _________.

• absorbed

• released

_____ reactions usually feel hot!

• endothermic

• exothermic

If a chemical reaction is EXOTHERMIC, the temperature would....

• Stay the same
• Increase
• Decrease

10. Which of the following are examples of an exothermic reaction?

• Cooking an egg

• Plants making sugar through photosynthesis

• Dynamite exploding