circuit the current is the same at all points
A a short, thin wire
B a long, thin wire
C a short, thick wire
D a long, thick wire
When an electrical current is passed through a nichrome wire, electrical energy is changed
Plant juice fermented with yeast for several days
Extract distilled to give 95% ethanol
Energy is lost at each stage.
Work book 1 Chapter 4
Fuels such as coal, oil, and gas which were formed millions of years ago from the remai
Unit flow chart
Electricity is closely related to our
Some materials allow electrons to
pass through easily, some do not.
Types of electrical circuits
Electricity in the home
Resistance wires and fuses.
Less acidic than cola because it has a higher pH value.
ii) still mineral water
It contains dissolved carbon dioxide in it so it is slightly acidic.
They could be right as fizzy drinks are acidic in nature so they could
Iron and sulphur are the reactants.
Iron sulphide is the product.
magnesium + oxygen
Reactions with acids (1): metals: p 47
A metal corrodes whenever a chemical attacks its surface.
Explain that animals have their own niche or territory in an environment. A niche is a special place to live that
belongs to a population of animals. When there is a large variety of plants and animals living in a biome, such
as in a jungle, there tends t
Which of the following is not acidic?
B lemon juice
D fizzy drink
What would be the colour of pH paper when it is dipped in hydrochloric acid?
The pH scale is used to measure the
A pressure of a ga
Looking at electric plugs
Open a wired plug carefully. Try to locate the fuse. How many wires are there?
Electric cables have the following colour coding:
Explain that three pin plugs are a simple, safe way o
Burning fossil fuels such as coal and oil give off these gases causing acid rain. Acid rain damages
buildings and plants. It also pollutes water, killing fish.
It gives the exact pH of the acid or alkali.
Unit flow chart
What are energy resources?
How do fuels release energy?
What are fossil fuels?
The harmful effects of burning fossil
Conservation of energy
Renewable energy resources
Energy from living things
Ask students why we use switches in a circuit.
Stress the importance of being able to switch the current on and off when required. Discuss the different
types of switches used in circuits.
The flow of charge is called a current
Similar to a greenhouse, carbon dioxide is very good at keeping heat within the Earths
atmosphere. This is why it is called a greenhouse gas. It has been very useful in making the Earth
warm enough for human life to survive.
Test yourself: p 7172
Green plants can make their food during the day time. When the Sun sets the process of
photosynthesis stops and the plant makes use of the stored food.
In summer, trees make food by photosynthesis and store it in thei
Unit flow chart
Matter can exist in more than one
state: solid, liquid, or gas.
The state of a substance depends on
how the particles in it are arranged.
Evidence for the existence and
behaviour of particles.
Many phenomena can be ex
is called a greenhouse gas.
A Sulphur dioxide
B Carbon dioxide
C solar energy
D natural gas
Most of the worlds energy comes from burning
Which of the following is not a renewable energy resource?
A solar cell produces a small amount of electricity when light shines on it.
They produce electricity for satellites.
A large number of solar cells are needed to produce useful energy.
A tidal barrage is a long barrier built across the m
No more gas is being produced.
The zinc granules have been used up completely.
Test the gas with a burning splint. If the gas burns with a blue flame accompanied by a popping
sound, the gas is hydrogen.
Problems to solve
Why must there be green plants in every community of living things?
How do humans disturb the balance of living things?
There were many deer in a forest. Hunters killed the lions, wolves and other predators of the deer.
Resistance: p 61
too much current flowing through the bulb
The thin filament of the bulb gets hot, burns and melts when a large current flows through it.
Copper has the lowest resistance.
The resistance of a wire decreas
reversed. We cannot get back the paper we have burnt. Similarly, when we heat mercuric oxide, mercury
and oxygen are produced. A red powder is changed into a silver-coloured liquid and a colourless, odourless
gas is given off. Both of these are examples o
Living things together with the abiotic parts of their environment form an ecosystem.
A woodland ecosystem, where animals depend for food and shelter on the plants. The soil
provides water and minerals for plants to grow.
The study of ecosy
Additional activity 2
Ask the students to make a list of the ways to reduce different kinds of pollution. They can do research
on the Internet. They can either submit it as a project or as a chart for display in the school corridor.
Fossil fuels like coal