Chemistry

Question 1

Mixture

Answer 1

Made up of several substances not chemically bonded together. The substances in the mixture do not change their properties. They are easy to separate. An example is toothpaste and seawater

Question 2

Compound

Answer 2

Contains more than 1 element, chemically bonded together. A compound has different properties than it’s elements. Chemical reactions are needed to split into elements.

Question 3

Pure

Answer 3

Has no other substances mixed with it. It has a sharp melting point.

Question 4

Impure

Answer 4

The opposite of pure

Question 5

Solution

Answer 5

A mixture of a liquid with a solid or gas.
Water is the solvent
Coffee granules are the solute (has dissolved)
Carbon dioxide is dissolved in fizzy drinks

Question 6

Dissolving

Answer 6

When for example sugar dissolves, each sugar particle becomes surrounded by the water and moves randomly in the liquid.

Question 7

Solubility

Answer 7

The mass of solute that dissolves in 100g of water to make a saturated solution. Every substance has its own solubility. Sugar is more soluble than salt. If the temp is higher the solubility is greater.

Question 8

Saturated solution

Answer 8

It contains the maximum mass of a substance that will dissolve

Question 9

Filtration(filtering)

Answer 9

Separate a liquid from an insoluble solid or it separates a solution from a solid that is not dissolved in it.
E.g. using filter paper that has tiny holes, but big enough for liquid e.g. water to pass through. Real life uses include sand filters to clean drinking water; filter coffee; oil filters in car stop dirt damaging parts.
What passes through = filtrate; What is left = residue (too big to pass through holes of e.g. filter paper)

Question 10

Evaporation

Answer 10

When a substance is heated the liquid leaves the surface of the solution and a solid remains for example salt from seawater.

Question 11

Distillation

Answer 11

A process that uses evaporation and condensation from a solution. An example is obtaining drinking water from sea water in arid countries.

Question 12

Chromtography

Answer 12

It separates substances in a mixture and it used to find which dyes in which colours. You mark the chromatography paper with a pen and the water carries the dyes up through the paper at different rates and it produces a chromatogram. It can be used for finding different pigments in food which show how much nutrients is in the food.

Question 13

Solution

Answer 13

A mixture of a liquid with a solid or gas.
Water is the solvent
Coffee granules are the solute (has dissolved)
Carbon dioxide is dissolved in fizzy drinks

Question 14

Dissolving

Answer 14

When for example sugar dissolves, each sugar particle becomes surrounded by the water and moves randomly in the liquid.

Question 15

Solubility

Answer 15

The mass of solute that dissolves in 100g of water to make a saturated solution. Every substance has its own solubility. Sugar is more soluble than salt. If the temp is higher the solubility is greater.

Question 16

Saturated solution

Answer 16

It contains the maximum mass of a substance that will dissolve

Question 17

Filtration(filtering)

Answer 17

Separate a liquid from an insoluble solid or it separates a solution from a solid that is not dissolved in it.
E.g. using filter paper that has tiny holes, but big enough for liquid e.g. water to pass through. Real life uses include sand filters to clean drinking water; filter coffee; oil filters in car stop dirt damaging parts.
What passes through = filtrate; What is left = residue (too big to pass through holes of e.g. filter paper)

Question 18

Evaporation

Answer 18

When a substance is heated the liquid leaves the surface of the solution and a solid remains for example salt from seawater.

Question 19

Distillation

Answer 19

A process that uses evaporation and condensation from a solution. An example is obtaining drinking water from sea water in arid countries.

Question 20

Solution

Answer 20

A mixture of a liquid with a solid or gas.
Water is the solvent
Coffee granules are the solute (has dissolved)
Carbon dioxide is dissolved in fizzy drinks

Question 21

Dissolving

Answer 21

When for example sugar dissolves, each sugar particle becomes surrounded by the water and moves randomly in the liquid.

Question 22

Solubility

Answer 22

The mass of solute that dissolves in 100g of water to make a saturated solution. Every substance has its own solubility. Sugar is more soluble than salt. If the temp is higher the solubility is greater.

Question 23

Saturated solution

Answer 23

It contains the maximum mass of a substance that will dissolve

Question 24

Filtration(filtering)

Answer 24

Separate a liquid from an insoluble solid or it separates a solution from a solid that is not dissolved in it.
E.g. using filter paper that has tiny holes, but big enough for liquid e.g. water to pass through. Real life uses include sand filters to clean drinking water; filter coffee; oil filters in car stop dirt damaging parts.
What passes through = filtrate; What is left = residue (too big to pass through holes of e.g. filter paper)

Question 25

Evaporation

Answer 25

When a substance is heated the liquid leaves the surface of the solution and a solid remains for example salt from seawater.

Question 26

Distillation

Answer 26

A process that uses evaporation and condensation from a solution. An example is obtaining drinking water from sea water in arid countries.