Science Form 1 Chapter 4
Transcript of Science Form 1 Chapter 4
CHAPTER 4
The Variety Resources On Earth
List the resources on Earth needed to sustain life
List resources on Earth used in everyday life
4.1 The different resources on earth
Since the beginning of life on Earth, every living thing depends on
Earth’s resources
such as energy, plants, animals, air, water, soil and other living
things to stay alive.
Imagine what will happen to us if Earth is without the essential
resources below.
Air , Living things, water,
energy, soil
What is Matter?
Since the beginning of life on Earth, every living thing depends on
Earth’s resources
such as energy, plants, animals, air, water, soil and other living
things to stay alive.
Imagine what will happen to us if Earth is without the essential
resources below.
Discuss what your life would be like if Earth’s resources are lost.
All resources on
Earth are classified as matter except energy. Why?
What is matter made up of?
Various resources
Air
Is needed by all living things to survive.
Air is a mixture of gases. It consists of :
Nitrogen
Oxygen
Carbon dioxide
Water vapour
Inert gases
Dust and microorganism
The layer surrounding the earth is called ATMOSPHERE
Water
• Covers a total of about three quarted of the Earth’s surface
Various resources
Sources of water include:
Rivers
Lakes
Oceans
Seas
Rainfall
Groundwater
All living things need water to survive. 70% of the human
body is water.
Soil
Is the habitat for many types of organisms
Various resources
Soil provides support for plants and ensure proper growth
for plants
There are various types of flora and fauna on Earth. These
flora and fauna are natural resources that sustain life. They
provide us food, clothes and building materials.
Minerals
Are inorganic substances found naturally on land and in
seas. Examples:
- iron - Silver
- lead - gold
Minerals are required by our body to ensure proper
functioning of our systems.
Various resources
Minerals are also required by plants for healthy growth.
Fossil Fuels
Formed from the remains of animals and plants that died
millions of years ago
Fossil fuels include petroleum natural gas and coal
Petroleum is a hydrocarbon that can be separated into different
components by fractional distillation
Living Things
The living things consists of plants (flora) and animals (fauna).
Living things provide us with food, clothes, fuels, building
materials and medicine
State what elements, compounds and mixtures are
Give examples of elements, compounds, mixtures
State differences of elements, compounds, mixtures
Carry out activities to see the differences of metal and non
metal
Classifies elements as metal and non-metal
Give examples of metals and non-metals
Carry out activities to separate the components of mixture
CHAPTER 4
The Variety Resources On Earth4.2 What are elements, compounds, mixtures
ElementsMatter on Earth is made up of elements.
An element is a substance that cannot be broken down into two or
more simpler substances by any known method.
More than one hundred elements have been discovered or synthesized
by scientists. Most of the elements occur naturally while the rest are man-
made.
Hydrogen and helium are the most abundant elements in our universe.
Oxygen and silicon are the most abundant elements in the Earth’s crust.
Most elements are solids at room temperature except for bromine and
mercury which are in liquid form. 11 elements are gases including
chlorine,
fluorine, oxygen and helium.
Element
Molecule of element
An element is made up of 1 type of
molecule only
ElementsAll metal elements are solids at ordinary room temperature except mercury
To find out whether an element is metal or non-metal, we have to identify and compare
the properties of the element with those of metals or non-metals.
The table below shows the general propeties of metals and non-metals
Metal Non-metal
Shiny Appearance Dull / not shiny
Good electric conductor Electric conductivity Poor (except graphite)
Good heat conductor Heat conductivity Poor heat conductor
High melting points Melting points Low melting points
High density Density Low density
Hard Solids Soft
Ductile / easily molded Ductile Not ductile / snap easily
Malleable (easily
shaped)
malleability Brittle (easily break when
beaten)
Uses of Metal Uses of Non-Metal
Compounds
A compound is a substance formed by the chemical combination of two
or more elements. Every compound is represented by a chemical symbol.
Example
Water is a compound because it is made up of two chemically combined
elements, which are hydrogen and oxygen. Have you seen the symbol
H2O before?
These particles combined chemically in a fixed proportion.
Compound can only be separated by chemical methods such as
electrolysis.
Some examples of compounds are common salt, water, sand and
carbon dioxide.Example
Compound
Molecule of elementElement X
Element Y
Combined together chemically
Compound
Examples of Compound
Molecule of element
Oxygen Atom
Hydrogen Atoms
Water is made up of two types of
elements: Oxygen and Hydrogen
Hydrogen Atoms
Nitrogen Atom
Ammonia is made up of two
types of elements: Nitrogen
and hydrogen
Mixtures
Mixtures are substances that are made up of two or more types of
particles which combine physically.
These particles do not combined chemically and they are mixed in any
proportion.
Some of the examples of mixtures are blood, sea water, air and soil
The components of mixture can be separated by physical methods such
as evaporation, filtration, using separating funnel and using a
magnet.
Mixture
Element X
Element Y
Element Z
Element X
Element Y
Compound
Compound X
Compound Y
Mixture of elements
Mixture of elements and compound
Mixture of compounds
Comparison of compounds and mixtures
Compound Difference Mixture
Formed using
chemical methods
Method of
formation
Formed using physical
methods
New substances
formed
Formation of new
substances
No new substances
formed
Heat is absorbed or
released during
formation
Energy changes
No heat is absorbed or
released during
formation
Ratio of components is
fixed
Composition of
components
Ratio of components is
not fixed
New properties are
formed
Properties of
components
Properties of
components remain the
same
Components can only
be separated using
chemical methods
Separation of
components
Components can be
easily separated using
physical methods
Explain the importance of the variety of Earth’s resources to man
State the meaning of preservation and conservation of resources
on Earth
State the importance of preservation and conservation of
resources on Earth
Practice reusing and recycling of materials
CHAPTER 4
The Variety Resources On Earth4.3 The importance of the variety of Earth’s
resources to Man
All living and non-living
things on Earth are
interlinked.You can perceive
things on Earth as a giant
spider web.The threads of the
web are the relationships
among the plants, animals,
soil,
water, temperature, light and
other living and non-living
things. Do you think the basic
needs of life are also related to
the Earth’s resources?
Resources On
Earth
AIR
Oxygen is needed for
respiration and
combustion
Carbon dioxide is
needed for
photosynthesis
Water
For drinking, cooking,
washing and bathing.
About 70% of the human
body weight is made up of
water.
Dissolves and transports
food and oxygen to all
parts of the body.
For generating electricity.
For recreational
activities.
Fossil Fuels
A very important source of
energy.
For generating electricity
Fuel
Minerals
Needed by man,
animals and plants for
healthy growth.
Metals are used in the
construction of building
and bridges
Soil
Agriculture
Mining
Construction of buildings
Making ceramics, glass,
cement and bricks
Habitat for many living
things
Preservation and Conservation
Preservation Is the effort to maintain natural resources in their original state
Conservation Is the careful use and management of natural resources so as
to minimize loss, wastage and damage
Preservation and conservation of natural resources are very
important to prevent:
a) Destruction to the natural environment
b) The extinction of animals and plants
c) The loss of economic resources
d) Pollution of air, water and soil
e) Health problems
f) Natural disasters
Effects of pollution1. Air pollution causes green house effect and acid rain
2. Water pollution reduces sources of clean water and
threatens the habitats of aquatic life
3. Soil pollution results in the infertility of the soil and
natural habitats of living things being damaged
Ways to reduce pollution on Earth’s resources
1. Recycle waste materials
2. Use recycle papers
3. Practice reforestation
4. Practice selective logging
5. Use unleaded petrol
6. Use biodegradable substances
7. Fix filters to factory chimneys in order to filter
poisonous gases
SMK Perempuan Likas
Sabah