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Chapter 4 science short note for form 1 students
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Chapter 4
The variety of resources on Earth
4.1 The Various Resources on Earth
Living natural resources
• Plants
(fruits, oil, vegetables …)
Non-living natural
resources
• Water
• Air
• Soil
• Animals
(milk, meat …)
• Soil
• Minerals
• Fossil fuels
• Metals
• Non-metal
Nitrogen bulb
Oxygen is one of
the gases that we
breathe in everyday
from the airPure carbon dioxide gas can
be poured because it is
heavier than air
Element, Compounds and Mixtures
Element can be divided into :
Metals ( Logam 金属金属金属金属)
• All metal element in solid
form but except for
mercury which exist in
liquid
Non- metals
(bukan logam 非金属非金属非金属非金属 )
• Non-metal elements exist
in all state. Solid, liquid
and gas at room
temperatureliquid
• Example of metal
Calcium, copper, gold,
lead, magnesium,
platinum, potassium,
silver, sodium
temperature
• Example of non-metal
Sulphur, carbon, bromine,
oxygen, neon, hydrogen,
Cobalt chloride indicator
Moist / Damp
( basah 潮湿)
Colour : Pink
Dry
(kering干燥)
Colour : Blue
Gas tests
Hydrogen (氢氢氢氢)
What you will observe:
-Your light splint
(Popsicle stick) will “POP” POP”
and go out.
Oxygen (氧氧氧氧)
What you will observe:
-Your glowing splint will re-light
and go out.
Why does this happen:
-Hydrogen gas is very
flammable and in the
presence of heat or fire it
will explode at a certain
temperature.
What does that mean:
-This happened because
Oxygen is part of the fire
triangle. The fire triangle is
composed of three things:
Fuel, Heat energy source
and Oxygen.
Mixture (campuran 混合物)
Brass Iced miloPaint
Nasi lemak Ice kacang Sugar solution
Example of variety type of mixture and its components
Formation of compound
( sebatian 化合物)
In chemical reactions the chemical identities of substances change. Here, a mixture of hydrogen and oxygen undergoes a chemical change to form water.
The differences between compounds and mixture
Separation of mixtures
• To separate insoluble solids
(pepejal tak larut 不能溶解的固体) from
Method : Filtration
( penurasan 过滤过滤过滤过滤)
能溶解的固体) from the liquid in a solid-liquid mixtures
E.g. To separate water and sand
Separation of mixtures
Distillation (penyulingan 蒸馏法)
To separate a solvent from a
liquid or solid-liquid mixture.
Two types of processes to
take place
(a) Boiling
liquid vapour/Gas
• (b) Condensation
vapour Liquid
E.g. To separate water from
salt solution
Using magnet
• To separate substances which are attracted to a magnet from other objects made from non-objects made from non-magnetic materials
• E.g. To separate iron filings and sulphur
Extraction
To separate liquid substances that do not mix well and with different
Oil with different densities.
E.g. To separate oil from water
Water
Chromatography
• Separates coloured components in a mixtures
Sieving (penapisan 筛选)
• To separate mixture of solid substances with different sizes.
AIR ( udara 空气) Oxygen :
i. Breathing / cell respiration
(penafasan 呼吸)ii. Combustion / burning
Carbon dioxide
(karbon dioksida 二氧化碳 ): i. To put out of fire
ii. Importance for photosynthesis
(fotosintesis 光合作用)
Soil and mineral
Soil is habitat
( tempat tinggal 栖
息地) for many types of living
Soil contains water and minerals which is vital for the growing of plants.
types of living
organisms ( benda
hidup 生物).
Fossil fuel
• To provide energy for household use, factories household use, factories and power stations to generate electricity.
Water
• Regulates body temperature.
• Controls the • Controls the concentration of blood ( mengawal
kepekatan darah 调
节血液浓度).
Living things
• As food, medicine, fibre, building materials and so on.
Conservation
• Conservation of recourses
involves the intelligent use and
care of our resourcescare of our resources
Preservation
• The act of keeping the resources in their original state.
Example :Example :
i) Find alternative resources, such as solar energy to replace depleting resources such as petroleum)
ii) to prevent the extinction of flora and fauna.