Stage 7 unit 8 cambridge science

A substance that is not transparent

• Cloudy

• precipitate

• Glowing

• Burning

one of the most useful clues to decide if a _____________ has taken place is whether a gas is given off.O

Complete the equation :

Magnesium + hydrochloric acid ----> ______________ + ___________

• Maagnesium acid + hydrogen

• Magnesium chloride + hydrogen

• Hydrogen chloride +magnesium

When a piece of apple is placed in hydrogen peroxide it bubbles. A gas is given off. This gas is oxygen. To test for oxygen you use a glowing splint. When the _________________ is placed in the mouth of the test tube, it will relight if the gas is oxygen

When potassium is placed in water, ______________ gas is given off. The reaction produces so much heat the hydrogen burns.

True or False:

Change in the state of matter is an indication that Physical change happened.

• True

• False

The reactants are ________________.

• It's not used up in the process

• new substances made in the reaction

• the substances that react together

• End result of the reaction

1. Compare the melting points of magnesium, oxygen and magnesium oxide.

• Magnesium has a higher melting point compare with oxygen

• Magnesium has a lower melting point compare with oxygen

• Magnesium has a has a varrying melting while oxygen has certain melting point

1. Find one similarity between magnesium oxide and one of the reactants.

Acids and alkalis can cancel each other out. When you mix them together they react and make a neutral solution. This is called ____________.

• Organization

• Alkalization

• Acidification

• Neutralisation