Fizzes And Bangs

Question 1

What is the law of conversation of matter?

Answer 1

Matter cannot be created or destroyed but it can change it’s form.

Question 2

What is a physical change?

Answer 2

A change where no new substance is formed, it is easily reversable, there’s no change in colour and a small change in temperature.

Question 3

What is a chemical change?

Answer 3

A new substance is formed, change hard to reverse, change in colour, large change in temperature.

Question 4

What are some examples of a physical change?

Answer 4

Melting, condensation, freezing, evaporation.

Question 5

What are some examples of a chemical change?

Answer 5

Rusting, hard-boiling an egg, an apple browning, fireworks.

Question 6

What is a solid?

Answer 6

In a solid, the attraction between particles binds them together and makes them hold their shape. The particles vibrate softly.

Question 7

What is a liquid?

Answer 7

When a solid is heated, the particles vibrate faster until the attraction weakens and they are allowed to flow over each other, therefore forming a liquid.

Question 8

What is gas?

Answer 8

If a liquid is heated, the particles begin to vibrate so fast that the attraction between them becomes so weak that the particles spread apart. They move in straight lines until they hit another particle or the side of their containers, therefore filling any container they are in.

Question 9

What is mixing?

Answer 9

When two or more substances are mixed. Eg. Sand and iron fillings.

Question 10

What is a solution?

Answer 10

Mixtures where a solute dissolves in the solvent. The solute particles surround the ones of the solvent, spreading them thinly through the solvent.

Question 11

What is matter made up of?

Answer 11

Atoms that are constantly moving and held together by bonds.

Question 12

What is mixing?

Answer 12

When two or more substances are mixed together. Eg. Sand and Iron fillings.

Question 13

What is a solutions?

Answer 13

Mixtures where a solute dissolves in the solvent. The solute particles surround those of the solvent, spreading them thinly through the solvent.

Question 14

What is decomposition?

Answer 14

A chemical change. Reactants break up to form two or more different products. Eg. Extraction of aluminium from ore.

Question 15

What is synthesis?

Answer 15

A chemical reaction. Two or more reactants combine to form a single product. Eg sodium and chloride makes salt.

Question 16

What is combustion or oxidation?

Answer 16

A chemical reaction. The breakdown of reactants using oxygen. Reg Rusting.

Question 17

What is displacement?

Answer 17

A chemical reaction. One reactant replaces another to form products.

Question 18

What is a molecule?

Answer 18

The smallest stable unit of a substance.

Question 19

What is a compound?

Answer 19

Two different elements combined. All compounds will be molecules.

Question 20

What is an element?

Answer 20

Some, but not all will be molecules.

Question 21

Is rusting a chemical or physical reaction?

Answer 21

Chemical.

Question 22

What is rusting?

Answer 22

The corrosion of iron from air or water.

Question 23

How can one prevent rust?

Answer 23

Prevent oxygen and moisture from contacting the metal. By covering the surface with paint, plastic or oil. Covering it with sinc, which will react with the air instead of the metal. Alloying, which is mixing different types of metals with iron to make it more resistent.

Question 24

What is quantative?

Answer 24

Mass, volume, length.

Question 25

What is qualative?

Answer 25

Observations- subjective,

Question 26

What are monomers?

Answer 26

Units that make up polymers. Can be same or different.

Question 27

What are polymers?

Answer 27

Long chained molecules.

Question 28

Lost some natural polymers.

Answer 28

Cotton, rubber.

Question 29

List some synthetic polymers.

Answer 29

Polystyrene, polyethnylene, polycarbonate (PVC)

Question 30

What is polymerisation?

Answer 30

The process of connecting monomers to create polymer chains.

Question 31

What are some good things about plastic bags?

Answer 31

They do not rot or corrode in air or water. Can be used as insulators, cheap and can be moulded into any shape. Easily coloured. Lighter then wood, metal or glass. Attractive finish. Not affected by acids.

Question 32

What are some bad things about plastic bags.

Answer 32

Do not rot so are hard to get rid of. Some types catch fire easily. Give off harmful gases when burnt. Cheap so often thrown away. Doesn't look as good as natural products. Uses non-renewable recourses when man manufacterd. Can harm wildlife.

Question 33

What are some ways to decrease our plastic waste promblem?

Answer 33

Taking our own bags instead of accepting plastic bags at shops to reduce to amount of rubbish produced. Reuse waste items. Recycle waste products.

Question 34

What is a biodegradable material?

Answer 34

A material that can be broken down and used as food by bacteria and fungi in the soil or water.

Question 35

What are biopolymers?

Answer 35

Biodegradable polymers. Scientists have been working to develop these which will lead to creating biodegradable plastics.,

Question 36

How can cornstarch help break down polymers?

Answer 36

When cornstarch is inserted into a polymer chain, bacteria will digest the parts with the starch, speeding up the breakdown process.