Ark Elvin Academy Year 8 Science Revision Pack

Autumn Assessment 2017

Name _________________________________________

What am I going to be assessed on?

How many exams will I have? 1 Biology Exam (30 mins) 1 Chemistry Exam (30 mins) 1 Physics Exam (30 mins)

Year 8 Autumn 2 assessment - topics assessed

Year 7 (cumulative content)

Cells

Particles and their behaviour

Forces Structure and function of body systems: gas exchange and breathing

Elements, atoms and compounds

Sound

Reproduction in plants and animals

Reactions

Acids and alkalis

Light

Space

Year 8

Health and lifestyle

Periodic Table

Electricity and Magnetism

Poison in cigarette smoke Harm it causes

nicotine makes arteries narrower, causes heart disease

tar can cause cancer

carbon monoxide stops red blood cells carrying so much oxygen

Food

We need to eat a wide variety of foods to provide our bodies with all the substances that are

needed. When we do this, we are said to have a balanced diet. Carbohydrates, proteins, fats, vitamins and

minerals are nutrients, which means that they provide the raw materials for making

other substances that the body needs.

A balanced diet contains the correct proportions and the correct amounts of each nutrient. A

shortage of a particular nutrient can cause a deficiency disease. Eating too much of a particular

substance can also cause problems.

Substance needed Examples Why it is needed Good sources

carbohydrate starch, sugars for energy pasta, bread

protein for growth and repair meat, beans

vitamins vitamin C for health fruits and vegetables

(e.g. oranges contain lots of

vitamin C)

minerals calcium for health fruits, vegetables and dairy

products (e.g. milk contains

a lot of calcium)

fibre for health (helps to stop

constipation) wholemeal bread

water for health (water dissolves

substances and fills up cells)

We can do tests to find out which substances are in foods. For example, starch makes iodine

solution go a blue-black colour. Benedict’s reagent turns from blue to orange/red when heated with sugar.

Eating too much or too little can cause problems. Too much fat may cause heart disease and

make you overweight. People who are very overweight are obese. People starve and become weak

if they eat too little.

Drugs are chemicals that affect how the body works. Cigarettes contain a drug called nicotine, which

is addictive (you feel that you cannot do without it). The chemicals in cigarette smoke are harmful.

Medicines are drugs that can help people who are suffering from diseases (e.g. antibiotics).

Recreational drugs are legal drugs that people take because they like the effect that they have on their

body (e.g. caffeine in coffee and alcohol). Some are illegal drugs (e.g. heroin and ecstasy) because they

can be very harmful.

Drugs that slow down the nervous system are called depressants. Alcohol is a depressant. It alters behaviour

and slows reaction time. Drugs that speed up the nervous system are called stimulants (e.g. caffeine). Misuse

of any drug can be harmful, especially to the liver.

8A Health and lifestyle

Digestion

Digestion turns large insoluble substances into small soluble ones. The organs of the digestive system help us

digest food. Many of them produce enzymes (chemicals that break up food).

We can use a model to make it easier to think about how something complicated works. Here is a model for

how enzymes work

Food is digested in the gut.

8A Health and lifestyle

To help absorb the digested food, the wall of the small intestine is thin and covered with villi. These increase the surface area

which increases the rate of diffusion

for.

8 Periodic Table

8 Periodic Table

8 Periodic Table

8 Periodic Table

8 Electricity and Magnetism

8 Electricity and Magnetism

In a series circuit the potential difference of the battery is shared across all the

components in the circuit. In a parallel circuit the potential difference of the battery

is the same as the potential difference across each branch of the circuit.

In a series circuit the current is the same at all points in the circuit:

In a series circuit the potential difference is shared across all the components in the

circuit. The total of the potential differences across all the components is equal to

the potential difference across the battery.

In a parallel circuit the current is split between all the branches of the circuit.

However the potential difference across each branch is the same as the potential

difference across the battery.

8 Electricity and Magnetism

8 Electricity and Magnetism