Science stage 9 G8 chapter 8: Energy transfer

Complete the equation:

hydrocarbon + oxygen => .... + ...

(write answer in form ...., ...)

Which of the following terms describes a reaction in which there is a net transfer of energy from a system to its surroundings - that is, where more energy is released by bond formation than is consumed by bond cleavage?

• exothermic

• endothermic

The formation of a chemical bond releases energy. True or false?

• True

• False

What are the three states of matter?

• Freezing, melting and evaporating

• Solid, liquid and gas

• Elements, molecules and compounds

• Solidification, condensation and freezing.

The burning of methane can be written by the chemical equation:

CH4 + 2O2 => CO2 + 2H2O

The reactants of this reaction are:

• 2O2 and 2H2O

• CH4 and CO2

• CH4 and 2O2

• CO2 and 2H2O

Burn Magnesium in the air, the white powder formed is ...

Burn Magnesium in the air, what is formed white powder?

What is the element in coal?

• C

• Na

• K

• Ba

Self-heating can is an example of the .... reaction.

Which of these processes are endothermic?

• Burning gas on a stove

• Ice melting

• Photosynthesis

• Firework exploding

• Steam condensing