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Science Sec 2 {Interactions} Part 2 - Coggle Diagram
Science Sec 2 {Interactions} Part 2
Chemical Changes
difference between physical and chemical changes
physical changes
NO NEW SUBSTANCE
formed
example
salt and water in a cup, mixed
The change
IS REVERSIBLE
chemical changes
THERE IS
a new substance formed
example
formation of rust
The change
IS IRREVERSIBLE
take note
3nergy in the form of Electricity:zap:,heat:sunny: or both may be
TAKEN IN OR GIVEN OUT
during Chemical Change
example is rust
chemical changes can be represented with word equations
Reactants
conditions
products
after/ new substance
what you do (e.g. heated)
before/old substance
example
burning charcoal
carbon+oxygen
heated
carbon dioxide+water
Reactants and Products are very different and its mixture is IRREVERSIBLE to be
considered
a chemical change
occurs when matter Interacts with Heat :sunny:, light :bulb: and electricity :zap:
occur when
TWO OR MORE
different kinds of matter interact with each other
(ATOMS) In a chemical reaction,
Types of Chemical changes
interactions between matter and oxygen
oxidation
Combustion
refers to the combination of a substance with oxygen in the presence of heat..One or more new substance(s) formed
releases a lot of energy that can be used for cooking, transport and generating electricity:zap:
Petrol+Oxygen
heated
Carbon Dioxide+Water Vapour
Cellular respiration
occurs in the cells of living things
process in which the cells of plants and animals take in Oxygen to release the energy stored in the glucose
Glucose+Oxygen
Carbon Dioxide+Water
Energy is also released
Rusting
interactions between matter and light
X-ray film
exposure to light decomposes the silver bromide into silver, producing the dark areas o the film
Silver Bromide
X-ray/Lighted
Silver(grey solid)+Bromine
Photossynthesis
Process in which green plants:palm_tree: make food:shallow_pan_of_food: in the presence of light:bulb:
Carbon Dioxide+Water
heated by sunlight and mixed with chlorophyll
Glucose(sugar/food) +Oxygen
interactions between matter and heat
irreversible
thermal decomposition
the process in which a substance is
broken down into 2 or more simpler substances by Heat
:sunny:
by word equation of sugar heated
Sugar
heated
Carbon + Water Vapour
limestone
interactions between matter and electricity
two different types of interactions
Electrolysis
a substance is broken down into simpler substances when an electrical current passes through it.
water
electrified
1 more item...
the chemical decomposition of substances with the passage of an electric current
Electroplating
metal covers of coins and trophies helps to prevent them from
Rusting
. This is done by Electroplating
The process in which a substance is
coated
with a metal with the passage of an 3lectric current:zap:
interactions between matter when mixed
example light sticks
Interactions between matter
indicators
Acids and Alkalis
Acids and metals
when dilute acid mixed with certain metals, hydrogen gas and a salt is produced
Dilute acid + Metal
Salt +Hydrogen Gas
When magnesium+dilute hydrochloric acid, magnesium used up and leaves a colourless solution
Hydrochloric Acid + Magnesium
Magnesium Chloride + Hydrogen gas
Acids react with carbonates
Alkalis are generally present in bitter stuff and it has a slippery feel like soap and detergent
Acids are present generally on sour things like lemon:lemon:
Movement of Atoms during Chemical Reactions:explode: :
cannot be created or destroyed
Sodium + Chlorine -- Sodium chloride
Friends or Foes?