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Success Criteria - Chap 11.pdfIntroduction to Chemical Changes:
Introduction to Chemical Changes:
- Crash Course Kids
Think: This video uses baking as an analogy. During baking, there is only a physical change if you are simply mixing the ingredients.
How does putting it into an oven cause a chemical change? What are the evidences that a chemical change has occurred?
Chemical VS Physical Changes:
Chemical VS Physical Changes:
- Free School
Test Yourself: State the main differences between physical and chemical change.
Name everyday examples of physical as well as chemical changes!
Chemical Changes Involving Heat
Chemical Changes Involving Heat
Thermal Decomposition
- Revision Monkey
Tip:
Having just one reactant (on the left side of the equation) is a big clue that the reaction is a type of decomposition.
Oxidation
- It's AumSum Time
Tip:
Rusting is an example of oxidation - Having oxygen as one of the reactants is a big clue that the reaction is oxidation.
Combustion
- Stile Education
Tip:
An everyday word for combustion = "burning".
During combustion,
a substance reacts with oxygen
the substance is heated
a lot of heat energy is released
Think: Why is combustion considered a type of oxidation reaction?
Chemical Changes Involving Light
Chemical Changes Involving Light
Tip:
Photographic film contains silver bromide. When exposed to light, it decomposes to form silver (dark areas on the film) and bromine.
Tip:
X-ray film is also made of silver bromide. The bones allow less X-ray to pass through (compared to the skin), hence it appears lighter / "white".
Chemical Changes Involving Electricity
Chemical Changes Involving Electricity
- FuseSchool
Think: Why is electrolysis considered a type of decomposition?
Tip:
Pay attention to the last part of the video:
What is an electrolyte?
What are electrodes?
What are attracted to the cathode?
What are attracted to the anode?
Electroplating a Key
- Home Science Tools
Tip:
DIY Experiment- Look at how the key is coated with copper!
Notice that the object to be coated (key) is connected to the negative electrode, while the metal (copper) is connected to the positive electrode.
Chemical Changes Involving Mixing Acids and Alkalis
Chemical Changes Involving Mixing Acids and Alkalis
- Aaron Huggard
Acid + Metal
What is the word equation for this reaction?
How do you conduct a test for hydrogen gas?
- Jin Meng Lee
Acid + Carbonate
What is the word equation for this reaction?
How do you conduct a test for carbon dioxide?
- MDR GCSE SCIENCE
Acid + Alkali
What is the word equation for this reaction?
Why is this reaction also known as neutralisation?
The pH Scale
The pH Scale
- Cognito
Tip:
Pay attention to the following concepts:
What are the pH values for acids? How about alkalis?
What are everyday examples of acids and alkalis?
What is a pH indicator?
Gas Tests
Gas Tests
- BGSS Science
Testing for Hydrogen Gas
Procedure
Place a lighted splint at the mouth of the test tube
Observation
It is extinguished with a 'pop' sound
Conclusion
Hydrogen gas is produced
- BGSS Science
Testing for Carbon Dioxide
Procedure
Bubble the gas into limewater (using a delivery tube)
Observation
A white precipitate is formed
Conclusion
Carbon dioxide is produced
Sketchnote - Topical Summary:
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