S4_Science_Flash_Card_Part_1

Front

To measure irregular solid

Back

measuring cylinder

Front

Dissolving

Back

Separates a mixture of two solids.

One solid mixes with a solvent to form a solution.

e.g Mixture of salt and rice grains can be separated after adding water.

Front

Fitration

Back

Separates insoluble solids from a solid-liquid mixture.

Passing the mixture through a filter.

e.g.: Remove tea leaves from a cup of tea.

Residue - tea (insoluble)

Filtrate - water

Front

Evaporation

Back

Separates a dissolved solid from a mixture.

Heating the solution to remove water.

e.g. Salt is obtained from evaporation of seawater.

Front

Distillation

Back

Separates a liquid from a solution with different boiling points

Heating the liquid to a vapour then condensing it.

e.g. Obtain water from seawater.

Front

Paper chromatography

Back

Separates mixtures such as ink and food colouring.

Dissolving the components in the mixture in a suitable solvent.

Front

Chemical reaction

Back

Process that leads to the formation of new products.

e.g. cooking of food

rusting of iron

decaying of food

burning of fuel

Melting of ice and boiling of water are not chemical reaction.

Front

Food preservation method

Back

1. 1. Lowering pH - Pickling of food

2. 2. Reducing water content of food - Dehydration

3. 3. Using low temperature - Freezing

4. 4. Reducing oxygen supply - Vacuum packaging

5. 5. Using high temperature - Sterilisation, canning

Front

Process slow down by

Back

1. 1. Decaying of food - Food preservation methods.

2. 2. Cooking food - Reduce oxygen

3. 3. Burning of fuel - Reduce of fuel supply

4. 4. Rusting iron - Tinplating

Front

Rusting

Back

Iron + oxygen + water -> rust