Physical N Chemical Changes
This document was uploaded by user and they confirmed that they have the permission to share it. If you are author or own the copyright of this book, please report to us by using this DMCA report form. Report DMCA
Overview
Download & View Physical N Chemical Changes as PDF for free.
More details
- Words: 525
- Pages: 16
CHAPTER 5: ENERGY AND CHEMICAL CHANGES 5.1 Physical and chemical changes
Introduction Living thing
Non-living thing
I. Both living and non-living thing are matter II. Matter around us undergoes changes. These changes can be classified into two types - physical changes - chemical changes
Physical changes • Physical changes in a substance is one that effect its physical properties, such as • Shape
•
Volume
•
Density
•
State of matter (solid,liquid,gas)
•
Colour
•
Mass
Physical changes • No new substance is form during a physical change. • Physical changes are usually reversible. This mean that the physical properties of the substance which has undergone a physical change can be changed back. Water
ice
water
Physical changes 1. Examples a) Changes of physical state •
Caused by heating Ice
•
steam
Caused by cooling Steam
•
water
water
ice
No new substance form because H2O remain H2O
Physical changes a) Dissolving a solid in water dissolved aqueous sugar ( larutan Sugar + water gula)
•
Reverse changes Aqueous sugar
Aqueous sugar
evaporated
distillation water
sugar + water
sugar +
Physical changes a) Crystallizing a salt from it saturated solution •
Saturated salt means a solution with maximum quantity of the salt dissolved on it.
•
Solid salt can be obtained by crystalization
Chemical Changes • Changes of matter that produce new substance • The new substance have chemical properties which are different from the original substance • Chemical changes are usually difficult to reverse. This means that the product formed cannot be easily changed back into the reactant
Chemical Changes 1. Example a) Burning of paper Paper
Burn
ash + carbon dioxide
but Cannot be Ash + carbon dioxide
paper
Chemical Changes a) Browning of a peeled apple
Peeled apple
Exposed to air
browning apple
Chemical Changes a) Combustion of feul Hydrocarbon + oxygen carbon dioxide + oxygen
Chemical Changes a) Photosyntesis
Carbon dioxide + water (in plant)
light
glucose + oxygen
Examples in daily life Physical changes in Chemical changes daily life in daily life Freezing of water to form ice cube
Boiling an egg to get a hard-boiled egg
Boiling of water
Burning of fossil fuel in motor vehicles
Dissolving sugar or salt in water
Respiration in living organism
Melting of wax to form different shapes of candles Melting of chocolate
Decomposition of fallen leaves
Evaporate of sweat
Photosynthesis in green plants
Digestion of food in our body
Comparison between physical and chemical changes Chemical changes
Physical changes SIMILARITIES
Substance in both processes undergo changes Both changes require energy DIFFERENCES In term of No
Formation of new substance
Yes
reversible
Reversibility
Difficult to reverse
Less energy is needed
Amount of More energy is energy required needed
Changes in physical properties only
Change in properties
Changes in chemical and physical properties
Comparison between physical and chemical changes Chemical changes
Physical changes SIMILARITIES
Substance in both processes undergo changes Both changes require energy DIFFERENCES In term of No
Formation of new substance
Yes
reversible
Reversibility
Difficult to reverse
Less energy is needed
Amount of More energy is energy required needed
Changes in physical properties only
Change in properties
Changes in chemical and physical properties
Introduction Living thing
Non-living thing
I. Both living and non-living thing are matter II. Matter around us undergoes changes. These changes can be classified into two types - physical changes - chemical changes
Physical changes • Physical changes in a substance is one that effect its physical properties, such as • Shape
•
Volume
•
Density
•
State of matter (solid,liquid,gas)
•
Colour
•
Mass
Physical changes • No new substance is form during a physical change. • Physical changes are usually reversible. This mean that the physical properties of the substance which has undergone a physical change can be changed back. Water
ice
water
Physical changes 1. Examples a) Changes of physical state •
Caused by heating Ice
•
steam
Caused by cooling Steam
•
water
water
ice
No new substance form because H2O remain H2O
Physical changes a) Dissolving a solid in water dissolved aqueous sugar ( larutan Sugar + water gula)
•
Reverse changes Aqueous sugar
Aqueous sugar
evaporated
distillation water
sugar + water
sugar +
Physical changes a) Crystallizing a salt from it saturated solution •
Saturated salt means a solution with maximum quantity of the salt dissolved on it.
•
Solid salt can be obtained by crystalization
Chemical Changes • Changes of matter that produce new substance • The new substance have chemical properties which are different from the original substance • Chemical changes are usually difficult to reverse. This means that the product formed cannot be easily changed back into the reactant
Chemical Changes 1. Example a) Burning of paper Paper
Burn
ash + carbon dioxide
but Cannot be Ash + carbon dioxide
paper
Chemical Changes a) Browning of a peeled apple
Peeled apple
Exposed to air
browning apple
Chemical Changes a) Combustion of feul Hydrocarbon + oxygen carbon dioxide + oxygen
Chemical Changes a) Photosyntesis
Carbon dioxide + water (in plant)
light
glucose + oxygen
Examples in daily life Physical changes in Chemical changes daily life in daily life Freezing of water to form ice cube
Boiling an egg to get a hard-boiled egg
Boiling of water
Burning of fossil fuel in motor vehicles
Dissolving sugar or salt in water
Respiration in living organism
Melting of wax to form different shapes of candles Melting of chocolate
Decomposition of fallen leaves
Evaporate of sweat
Photosynthesis in green plants
Digestion of food in our body
Comparison between physical and chemical changes Chemical changes
Physical changes SIMILARITIES
Substance in both processes undergo changes Both changes require energy DIFFERENCES In term of No
Formation of new substance
Yes
reversible
Reversibility
Difficult to reverse
Less energy is needed
Amount of More energy is energy required needed
Changes in physical properties only
Change in properties
Changes in chemical and physical properties
Comparison between physical and chemical changes Chemical changes
Physical changes SIMILARITIES
Substance in both processes undergo changes Both changes require energy DIFFERENCES In term of No
Formation of new substance
Yes
reversible
Reversibility
Difficult to reverse
Less energy is needed
Amount of More energy is energy required needed
Changes in physical properties only
Change in properties
Changes in chemical and physical properties
Related Documents
Physical N Chemical Changes
May 2020 9
Physical And Chemical Changes
November 2019 30
Physical Chemical
May 2020 11
Chemical Physical
June 2020 3
Physical Changes
May 2020 6