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Year 9 Chemical Reactions - For additional resources visit: http://www.iheartscience.net
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Chemical ReactionsSarah Jones
www.roligaprylar.se
Chemical Equations
Law of Conservation of Mass
Antoine Lavoisier discovered the Law of Conservation of Mass.
http://www.unit5.org/chemistry/Equations.html
http://en.wikipedia.org/wiki/Law_of_conservation_of_mass
The total mass of the reactants or starting materials must be equal to the mass of the products.
Meaning of Chemical Formula
http://www.unit5.org/chemistry/Equations.html
Showing States
(s) Solid (l) Liquid (g) Gas (aq) Aqueous
http://www.unit5.org/chemistry/Equations.html
http://www.unit5.org/chemistry/Equations.html
http://en.wikipedia.org/wiki/Chemical_equation
http://www.unit5.org/chemistry/Equations.html
Endothermic Reactions• Need energy to proceed and get their energy
from their surroundings.• Chemical cold pack – when the chemicals
inside react they absorb energy from their surroundings – cooling them down.
chemicalrecipes.blogspot.com
Exothermic Reactions• Release energy• The reactants have more energy than the
products.• Energy is usually released as heat and/or light.
en.wikipedia.org
Combustion Reactions• Exothermic• When something reacts with oxygen gas –
burning or exploding.
wall.alphacoders.com
Pollution and Climate Change
jurnalpedia.com
Corrosion Reactions• Chemical reactions that breaks metals down
to form other compounds.
www.european-coatings.com
Acid Reactions Acids can corrode metals – usually form salt and hydrogen gas.
www.nps.gov
Neutralisation Reactions
Acids and bases neutralise each other.
Acid + Base Salt + Water
commons.wikimedia.org
Acids and Carbonates
Acid + Carbonate Salt + Water + Carbon Dioxide
spmchemistry.onlinetuition.com.my
sco.wikipedia.org
www.syngenta.com
http://mrkubuske.files.wordpress.com
Human Respiration
http://mrkubuske.files.wordpress.com
Comparing Photosynthesis and Respiration
www.accessexcellence.org
