7S,7I,7G Science Revision

Question 1

7S-What is a hazard?

Answer 1

Something that can cause harm within a lab.

Question 2

7S-What is a risk?

Answer 2

Something dangerous that could happen because of a hazard.

Question 3

7S-What are some common control measures?

Answer 3

Wear goggles, wear gloves, tie your hair back, keep objects in the centre of the table.

Question 4

7S-What is a quantity?

Answer 4

Something that can be measured.

Question 5

7S-What equipment do you use to measure length,liquid volume and mass?

Answer 5

Length-Ruler
Liquid volume- Measuring cylinder
Mass- Scale/Balance

Question 6

7S-What should you do to make sure you measure the right amount?

Answer 6

Read your value with the equipment at eye level.

Question 7

7S-What’s the difference between safety and roaring flame?

Answer 7

A safety flame is orange and a roaring flame is a loud blue flame. A safety flame is cooler than a roaring flame.

Question 8

7S-What piece of equipment do we use to heat a substance?

Answer 8

A Bunsen burner.

Question 9

7S-How do you measure the temperature of a substance?

Answer 9

Using a thermometer.

Question 10

7S-What is the independent variable?

Answer 10

The variable that you change in an experiment.

Question 11

7S-What is the dependent variable?

Answer 11

The variable that you measure in an experiment.

Question 12

7S-What is the control variable?

Answer 12

The variable that you keep the same in an experiment.

Question 13

7S-What is an anomaly?

Answer 13

A result that doesn’t fit the pattern in your experimental results.

Question 14

7S-How do you calculate the mean?

Answer 14

Add up the values and divide this number by the number of values you added.

Question 15

7S-What should a good graph include?

Answer 15

Labelled axis, points plotted as crosses, a title and everything is drawn in a pencil and a ruler.

Question 16

7I-What is an energy store?

Answer 16

A way in which energy can be kept in a system.

Question 17

7I-What are the six types of energy store?

Answer 17

Nuclear,gravitational,elastic,chemical,kinetic,thermal.

Question 18

7I-How can we increase the energy in a kinetic,gravitational or chemical store?

Answer 18

Kinetic-move faster
Gravitational-lift the object higher
Chemical-eat food.

Question 19

7I-What is an energy transfer?

Answer 19

A way of moving energy from one store to another.

Question 20

7I-What are the five types of energy transfer?

Answer 20

Light,heat,forces,sound,electricity.

Question 21

7I-What is energy measure in?

Answer 21

Joules (J)

Question 21

7I-What is meant by the conversation of energy?

Answer 21

That energy cannot be created or destroyed, only transferred from one store to another.

Question 22

7I-How can we find out how much energy is in our food?

Answer 22

In the energy section of the nutrition label on the food wrapper.

Question 23

7I-What happens if we consume too much or too little energy in our diet?

Answer 23

If we consume too much,we gain weight.
If we consume too little, we lose weight.

Question 24

7I-How do I use a bunsen burner safely?

Answer 24

Tie hair up,tuck in ties,keep on a safety flame when not in use.

Question 25

7I-What is a fuel?

Answer 25

A fuel is a store of chemical energy.

Question 26

7I-How are oil,coal and natural gas formed?

Answer 26

They are formed by dead animals or plants that have fossilised after being under intense pressure and heat for millions of years.

Question 27

7I-What do we mean when we say a fuel is non-renewable?

Answer 27

That the fuel will eventually run out.

Question 28

7I-What are biofuels and why are they renewable?

Answer 28

Biofuel are fuels that are made from plant or animal waste.They are renewable as the supplies of them never run out.

Question 29

7I-What do we mean by the term renewable?

Answer 29

Renewable energy resources are sources of energy that never run out.

Question 30

7I-What are the advantages of renewable energy sources?

Answer 30

That they never run out and they do not add to global warming.

Question 31

7I-What are the disadvantages of renewable energy?

Answer 31

They usually depend on the weather to work (wind and solar) or they are expensive to build (hydroelectric).

Question 32

7G-What is a physical substance?

Answer 32

Something which has both mass and a volume.

Question 33

7G-What is meant by mass and volume?

Answer 33

Mass is how heavy something is. Volume is how much space something takes up.

Question 34

7G-What is meant by states of matter?

Answer 34

A state of matter is the form of a substance that can exist as either a solid,a liquid or a gas.

Question 35

7G-What are the properties of solids?

Answer 35

Solids have a fixed volume and shape.

Question 36

7G-What are the properties of liquids?

Answer 36

Liquids have a fixed volume, but no fixed shape. They can fow and take the shape of their containers.

Question 37

7G-What are the properties of gases?

Answer 37

Gases have no fixed shape and volume and they can be compressed into a smaller volume.

Question 38

7G-What is particle theory?

Answer 38

All matter is made up of particles. Particles experience forces of attraction keeping them together.

Question 39

7G-What are the forces of attraction like in a strong?

Answer 39

Strong

Question 40

7G-What are the forces of attraction like in a liquid?

Answer 40

Medium

Question 41

7G-What are the forces of attraction like in a gas?

Answer 41

Weak

Question 42

7G-What is a state change?

Answer 42

When a substance changes from one state to another.

Question 43

7G-What are the four types of state changes?

Answer 43

Melting, freezing, boiling, condensing.

Question 44

7G-What is a melting point?

Answer 44

The temperature at which a solid becomes a liquid.

Question 45

7G-What is a boiling point?

Answer 45

The temperature at which a liquid becomes a gas.

Question 46

7G-What observations did Robert Brown make?

Answer 46

Brown noticed that particles of pollen moved around randomly when placed in water.

Question 47

7G-What is Brownian motion?

Answer 47

The random motion of particles when suspended in a liquid or gas.

Question 48

7G-What is diffusion?

Answer 48

Diffusion is the 'spreading out' of particles in liquids and gases.

Question 49

7G-What states of matter can diffuse?

Answer 49

Liquid and gas particles.

Question 50

7G-What is meant by a high and low concentration?

Answer 50

Low concentration-area where there are a fewer number of particles. High concentration-area where there are plenty of particles close together.