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Chemical Changes - Coggle Diagram
Chemical Changes
What examples of chemical changes and their definitions?
Electrolysis/Electroplating
word equation:
Water -> hydrogen + oxygen
Respiration
word equation:
Oxidation
Combustion
word equation:
Carbon + oxygen -> carbon dioxide
Photosynthesis
word equation:
Neutralisation
word equation:
Acid + Alkali -> salt + water
Acid reaction with metal carbonate
Products:
Thermal decomposition
Sugar -> carbon + water
Acid reaction with metal
Products:
Photographic film
Word equation:
Conversation of mass in chemical change
Mass is conversed during a chemical change
Mass of reactants = mass of products
Sulfer + Oxygen -> Sulfur dioxide
S + O2 -> SO2
Properties of acid and alkali
Acid
Taste sour, pH lesser than 7
Alkali
Taste bitter, feels soapy, pH more than 7
Neutral solutions has pH of 7 e.g. pure water
What is a chemical change?
rearrangement of atoms
To forn new substance
What is an acid? What is an alkali?
Acid is a substance that produces hydogen ions when it dissolves in water
Alkali is a substance that produces hydoxide ions when it dissolves in water
Examples of acid and alkali in the lab and at home
Acids:
In the lab
At home/around us
Fruit juices, vinegar, car batteries, toilet cleaning solution, gastric juices
Hydrocholric acid, sulfuric acid, nitric acid, ethanoic acid
Alkalis:
In the lab
Sodium hydroxide, calcium hydroxide, aqueous ammonia
At home/Around us
Fertilizers, detergent, soap
Indicators
Litmus paper ( Blue and Red)
Universal indicator
Awareness that chemical changes can be beneficial of harmful
CO2 and its effects on global warming