Revision 8

Enzymes act as ........................ because they speed up chemical reactions in cells.

........................................ is an essential macronutrient important for making new cells to help us grow and repair our bodies.

Digestion mainly takes place in ............................

.................................... is the net movement of particles from a region of a higher concentration to a region of lower concentration, without the help of outside.

Hydrocarbons are molecules mainly consisting of .............................. and .............................

Combustion reactions are ............................ reactions.

................................ .................................. causes carbon monoxide gases to react with more oxygen to form carbon dioxide.

The increase in greenhouse effect is known as ............................ ........................

.................................... is the change of state directly from a solid to a gas.

Pressure ............................. as the temperature increases.