Year 7 Chapter 1 And 2

Question 1

Why is science important and its impact on daily life

Answer 1

Science studies world and how it works. Science helps with medicine and disease, technology, environment from global warming to cloning animal extinction. Even to physics with force and motion determining speed limits and laws

Question 2

Branches of science

Answer 2

Chemistry, biology plants and animals, physics force, geology study of rocks

Question 3

Define laboratory

Answer 3

Is where a scientists perform experiments and observations. Labs differ depending on branch of science

Question 4

What type of equipment can you find in a lab

Answer 4

Differs depending on branch of science, for example astronomer would have a telelscope,
But they would have digital technology to photograph and record data and specialised software to create model

Question 5

Balances measures mass

Name three types of balances

Answer 5

Beam, electric and spring

Question 6

Names types of glassware your would find in a lab

Answer 6

Beakers, test tube , watch glass and conical flask

Question 7

Name two types of heating equipment

Answer 7

Hot plates and Bunsen burner

Question 8

What do scientist draw in

Answer 8

2D

Question 9

Name some safety rules in the lab

Answer 9

Safety glasses, tie hair back, use tongs to pick up heated objects, make sure glassware cooled down, move around lab safetly, when Bunsen burner on turn to yellow flame

Question 10

When you describe the quality of things in words, eg. Olour shape wound is called what

Answer 10

Qualative observations

Question 11

What is quantative observations

Answer 11

When you describe things in numbers eg temperature, distance, volume

Question 12

What is the term scientist use for measurements

Answer 12

Units

Example g grams, kg kilograms, ml Millie litre

Question 13

Scientists communicate their findings and data via reports that can have table and graphs
Name some types Of graphs

Answer 13

Pie graph: used to show proportions
Line: used when 2 sets of measurements
Column and bar: column vertical and bar horizontal and used when their is one set of observations

Question 14

What are variables and name the 3 types

Answer 14

Are Factors that Can influence what happens in an experiment
Dependent:what you are trying to measure
Independent:trying to test what effect it has on the dependent
Controlled: all other variable not wishing to test that will remain constant

Question 15

What is an hypothesis

Answer 15

What you think will happen in your experiment

Question 16

What is the term for a practical investigation that is mainly a performed in labs

Answer 16

Experiment

Question 17

What is the name for a set of instructions that tell you how t o perform an experiment

Answer 17

Procedure

Question 18

What are physical properties

Answer 18

Characteristics of a substance for example solid liquid or gas

Question 19

Substance exists in what 3 forms

Answer 19

Solid liquid gas

Question 20

Describe a solid

Answer 20

Because particles close and packed together they are imcompressible and hold a fixed shape. When heated ( particles move faster) causes it to expand and when cooled contract

Question 21

Describe a liquid

Answer 21

Whilst particles are still close they are loosely bonded therefore allowing it flow and take shape of container. It is imcompressable and will also expand when heated and contract when cooled

Question 22

Describe gas

Answer 22

Particles are spread apart and nothing bonding them together which makes them compressible and at times invisible. Will spread to take shape of the container and will expand and contract

Question 23

Chemical properties

Answer 23

Is how a substance reacts with another. An example would. E rusting , corroding or combustion

Question 24

What is the name of the process where by due to bacteria and fungi ( causing chemical reactions) it breaks foe. Substances into a more simpler one

Answer 24

Bio grad ability and and example of biodegradable products are paper, cardboard

Question 25

What does and ecocoxilogigist study

Answer 25

The harmful effects of chemicals on plants and animals and places where they live.

Question 26

What is the partial model

Answer 26

The model that describe and explains the behaviour of particles, example they all have energy and when heated they move faster.

Question 27

What do you call the process where by 2 liquids or gases mix together

Answer 27

Diffusion

Question 28

What is Brownian motion

Answer 28

The motion of particles caused by being bumped and jostled by other particles

Question 29

What is melting

Answer 29

Occurs when heat changes a solid into a liquid

Question 30

What is freezing

Answer 30

Removing heat from a liquid to form a solid

Question 31

What is evaporation

Answer 31

When heat changes liquid into a gas

Question 32

What is boiling and boiling point

Answer 32

Boiling is when liquid heats and boiling point of water is 100 degrees Celsius

Question 33

What is steam

Answer 33

It is the condensation of water vapour forming water droplets

Question 34

What is condensation

Answer 34

It occurs when a gas loses heat and changes into a liquid. It cools forming particles bonding together

Question 35

What is density

Answer 35

The physical properties that determine wether a substance floats or sinks and how much matter is packed into a space

Question 36

What is mass

Answer 36

Measure how much matter is in a substance