Mixtures are __________ combinations of ___________.

The types of chemical reactions are: (A) solid, liquid and gas / (B) Evaporation, digestion and magnetic separation / (C) Elements, compounds and mixtures / (D) Oxidation, combustion and fermentation

In fermentation, bacteria that produce lactic acid ________ food and makes it last __________. (A) Destroys... less time/ (B) preserves... Longer / (C) preserves... Less time / (D) destroys... Longer

True or false? A milkshake is an example of a homogeneous mixture

True or false: matter is ONLY made up of heterogeneous mixtures.

Fermentation is caused by: (A) Fungi ONLY / (B) Fungi and bacteria / (C) Bacteria ONLY / (D) None of these answers is correct.

What material DOESN'T make food oxidize? (From class experiment) (A) Sugar / (B) orange juice / (C) flour / (D) oil

Combustion produces energy... (A) When water turns to ice / (B) When oxygen in the air reacts with wood, petrol and gas / (C) When ethanol and water mix / (D) when a gas turns into a solid.

What happens when a chemical reaction occurs? (A) The substance stays the same. / (B) The properties of a substance are changed. / ( C) The substance disappears / (D) Both B and C are correct

Which of the following can you separate with a magnet? Metal and Metal / Metal and plastic / Metal and sand /

Combustion produces energy in the form of _______ and _______ (A) Water and carbon dioxide / (B) oxygen and gas / (C) heat and light / (D) wood and natural gas

What things produce combustion? (A) Fish, plants and petrol / (B) Natural gas, wood and plastic / (C) Electricity, Iron and paper / (D) Natural gas, wood petrol

Chemical reactions occur around us _________. (A) Once every 5 billion years / (B) once every trimester / (C) all the time / (D) once a week.