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Canvas resources
Canvas resources
2. Chemical Reactions
2. Chemical Reactions
Observing a range of chemical reactions (Answers)
4. Recall that atoms can be chemically bonded in different ways.
Ionic, covalent bonding PPTs, videos (Dogs teaching...)
6. Understand that a chemical reaction involves atoms joining or separating from other atoms.
7. Understand that in chemical reactions the same atoms are present but are rearranged to form new substances.
Lego kits - make a duck
5. Define the terms reactants and products.
WS
Role play
REACTANTS AND PRODUCTS: Making sherbet (- see page 45 of your textbook) design experiment
8. Define the terms endothermic and exothermic in relation to energy during chemical reactions.
Reaction in a Bag
Use the summarising skills you developed in the Media Journal Task to summarise the information in the article below
Word equations
Conservation of Mass Explained - TedEd
Writing word equations (Products and Reactants revision) (Answers)
3 Combustion and Corrosion
3 Combustion and Corrosion
Spontaneous Combustion
Combustion/ corrosion research task
What is Corrosion? Plan your experiment.
Combustion Experiment Explanation
4. Acids and Bases
4. Acids and Bases
Why we need chemical - reactions with metals and carbonates (Links to an external site.)
Neutralisation Reactions Worksheet Answers
5. Balancing Chemical Equations
5. Balancing Chemical Equations
PRACTICE OF BALANCING EQUATIONS
Interactive on balancing equations (Links to an external site.)
Balancing combustion equations answers
6. Revision
6. Revision
2014 test on chemicals react.docx
Task 1.3
Task 1.3
1 View PPT
2. Complete Worksheet
9CR 1.1 Psyn Resp PPT.ppt
Review ionic bonding
Task 2.1b Complete the worksheet below.
Task 2.1c
Complete the Worksheet below
Don't worry about the bracket numbers. They are for later years!
Review covalent bonding
5. Define the terms reactants and products.
6. Understand that a chemical reaction involves atoms joining or separating from other atoms.
7. Understand that in chemical reactions the same atoms are present but are rearranged to form new substances.
Metals + acid practical.
Word equations with Molimod kits.
Practical 2.3 Reaction in a Bag
Practical 2.3 Reaction in a Bag
AIM: To use the scientific method to identify the reactions when calcium chloride, sodium bicarbonate, water, and phenol red are mixed.
1. Introduction
Background:
· Phenol red
- is used to test the pH of swimming pools.
· Calcium chloride
- is commonly used as an electrolyte in sports drinks and other beverages, including bottled water.
· Baking soda, or sodium bicarbonate
- is used in baking as it reacts with acids in bread to create carbon dioxide, which creates bubbles that form the holes in bread.
- can neutralise acids and is used to treat indigestion, heartburn, and burns.
- is an ingredient in some toothpastes, mouthwashes, deodorants and shampoos.
- is used in some types of fire extinguishers to put out fires
Hypothesis: If... then...
Equipment:
· 1 plastic Ziplock bag
· spatula
· baking soda (sodium bicarbonate / NaHCO3)
· phenol red
· calcium chloride (CaCl2)
· pipette
Procedure Part 1:
· Work in groups of 3-4
· Use all of your senses except taste to make your observations
· Record all of your observations (be as specific as possible)
· CAREFULLY mix 5ml (approx. 2 spatula loads) of each of the substances in the bag
· CAREFULLY add 2-3 pipettes of phenol red then seal the bag fully
· Gently shake the contents of the bag while holding the bag
· CAREFULLY observe the changes that occur (be aware as the changes will be QUICK)
Procedure Part 2:
· Brainstorm how to determine which reagents caused which change.
· Thoroughly rinse out your bag, then conduct experiments to test your predictions.
4. Acids and Bases
4. Acids and Bases
I can...
18. List the properties of acids.
19. Give examples of acids in our world.
27. Outline the importance of acids in our bodies and the world.
20. Write the chemical formula for hydrochloric, sulfuric and nitric acid.
21. List the properties of bases.
22. Give examples of bases in our world.
23. Identify an acid and a base experimentally.
24. Outline the nature of acid + base, acid + metal and acid + carbonate reactions.
25. Write word equations for acid reactions given any two reactants.
26. Understand that the term salt in chemistry can include a range of metal ions joined to negative ions.
28. Give examples of neutralisation reactions in our world and explain how they affect the pH of the solutions involved.
Overview
Overview
Acids
Common acids include:
hydrochloric acid, HCl
sulfuric acid, H2SO4
nitric acid, HNO3
Alkalis
Common alkalis include:
sodium hydroxide, NaOH
potassium hydroxide, KOH
calcium hydroxide, Ca(OH)2
Neutralisation
Alkalis and acids neutralise each other.
During the reaction, hydrogen ions from the acid react with hydroxide ions from the alkali to form water:
H+(aq) + OH-(aq) → H2O(l)
H+(aq) + OH-(aq) → H2O(l)
Salt formation
When an acid reacts with a metal hydroxide, a salt and water are produced:
acid + alkali (base) → salt + water
The name of a salt has two parts:
the first part comes from the metal in the metal hydroxide
the second part from the acid used
Potassium hydroxide Sodium hydroxide Calcium hydroxide
Hydrochloric acid Potassium chloride Sodium chloride Calcium chloride
Sulfuric acid Potassium sulfate Sodium sulfate Calcium sulfate
Nitric acid Potassium nitrate Sodium nitrate Calcium nitrate
Acids and alkalis can be identified using indicators and pH meters. Acids have a pH less than 7 and alkalis have a pH greater than 7.
Task 4.2
Task 4.2
View, research and make summary notes under the headings from the outcomes 18,20,19,27,21,22,26,28 above:
video: What are acids and bases? (below left) https://www.youtube.com/watch?v=mnbS56HQbaU [3.00]
PPT Acids and Bases (below right)
acidsandbasespptnotes-120226210915-phpapp01.pdfVisit
read and summarise https://www.bbc.co.uk/bitesize/guides/zsbxjty/revision/1
View videos:
https://youtu.be/DupXDD87oHc [4.00 mins]
https://www.youtube.com/watch?v=NoZmrwf1I_w [2.00 mins]
https://youtu.be/zWPqCj2YayU [2.00 mins]
https://media0.giphy.com/media/IxEV1JjzS8nrq/giphy.gif
23. Identify an acid and a base experimentally.
24. Outline the nature of acid + base, acid + metal, acid + carbonate reactions.
25. Write word equations for acid reactions given any two reactants.
Practical 2.4 Acid + Carbonate
Practical 2.4 Acid + Carbonate
View videos:
https://youtu.be/DupXDD87oHc [4.00]
https://youtu.be/zWPqCj2YayU [2.00]
Neutralisation https://www.youtube.com/watch?v=RmnT9jwX4gQ [2.41]
View Slideshare Neutralisation (use the link. If you have to log in, don't go any further.)
Practical 4.1 (We will do this Week 5)
Practical 4.1 (We will do this Week 5)
When you were little, you maybe read the Dr. Seuss book Green Eggs & Ham. Here’s a little pH trick to make some green eggs just like in the book.
What You Need:
Frying pan and stove
Egg
Red cabbage (it’s called red, but it looks purple!)
What You Do:
Chop a 1/2 cup of cabbage, cover it with boiling water, and let it sit for 10 minutes until the water is dark purple. Strain out the cabbage.
Crack an egg and separate the egg white from the yolk by carefully pouring the egg from one half of the shell to the other over a bowl. (Or you can pour the egg into a slotted spoon over a bowl instead.) Set the yolk aside.
Mix a little cabbage juice in with the egg white. What happens?
Grease the pan and let it heat up a little, then pour the egg white in.
Set the yolk in the middle of the egg white and finish cooking!
What Happened:
Red cabbage contains pigments called anthocyanins, which change colors when they come in contact with acids (low pH) or bases (high pH), making them a natural pH indicator. When the cabbage juice comes in contact with an acid (like vinegar) it will turn red, but when it is mixed with a base it will turn bluish-green. What does this project tell us about egg whites, then? Egg whites are basic (also called alkaline) and so they turn the red cabbage juice green.
https://media0.giphy.com/media/IxEV1JjzS8nrq/giphy.gif
Practicals:
Neutralisation reaction
Testing acidity/basicity of household substances
Task 4.4
Task 4.4
Outcome 25:
Complete the Worksheet at right for acids and bases revision.
Revision Acids and Bases.docTask 4.5
Task 4.5
Outcome 25:
Complete the Worksheet at right for acid - alkali reactions word equations.
46-2 acids and alkalis.pdfTask 4.6
Task 4.6
Outcome 25:
Complete the Worksheet at right for reactions with acids word equations.
9CR 4.5 Chemical-equations-worksheet-4-Acids-answers.docSTUDY TASK 4.7
STUDY TASK 4.7
Finish any work from earlier in the week.
Complete the worksheet at right. Green is optional extension.
Go to the Assessments Page of this site and complete the work there.
Revise for your task Week 5.
9CR 7 BALANCING EQUATIONS REVIEW.docxView videos:
https://youtu.be/wdgTlHU1bDs [3.25]
https://youtu.be/v7lYHb_dQLo?t=13 [23.00]
https://youtu.be/UygUcMkRy_c [4.21]
https://youtu.be/T4pSuflO9fk [2.52]
View examples of corrosion (these are links):
Ashtray Brass plate Bridge foot Car rust Chains and shadows City rust & graffiti Cooling towers Corrosion patterns Corrosion forms Corrosion examples
Corrosion hues Dezincification Erosion corrosion Flowers Graffiti & rust Marine rust Malachite Outdoor corrosion Pier rust Pitted pot Rust colors
Rust inspector Rust spot Rusty chain Rusty rivet Studebaker Tuberculation Weathering steel Window latch White rust Zebra mussels
Task 4.1
Task 4.1
Quick write what you know about Outcomes 5,6,7 above. Diagrams may be helpful.
Watch the video at right https://www.youtube.com/watch?v=eJXL0IrbtqE [4.16].
Read Pearson p46, and write a summary for Outcome 8: Define the terms endothermic and exothermic in relation to energy during chemical reactions.
Review the experiment you performed with the reaction in a bag (below left).
Write an experimental report for the experiment by adapting the scaffold (below right.) Add an equipment list and a risk assessment before the method.
8. Define the terms endothermic and exothermic in relation to energy during chemical reactions.
Practical 2.3 Reaction in a Bag
Practical 2.3 Reaction in a Bag
AIM: To use the scientific method to identify the reactions when calcium chloride, sodium bicarbonate, water, and phenol red are mixed.
1. Introduction
Background:
· Phenol red
- is used to test the pH of swimming pools.
· Calcium chloride
- is commonly used as an electrolyte in sports drinks and other beverages, including bottled water.
· Baking soda, or sodium bicarbonate
- is used in baking as it reacts with acids in bread to create carbon dioxide, which creates bubbles that form the holes in bread.
- can neutralise acids and is used to treat indigestion, heartburn, and burns.
- is an ingredient in some toothpastes, mouthwashes, deodorants and shampoos.
- is used in some types of fire extinguishers to put out fires
Hypothesis: If... then...
Equipment:
· 1 plastic Ziplock bag
· spatula
· baking soda (sodium bicarbonate / NaHCO3)
· phenol red
· calcium chloride (CaCl2)
· pipette
Procedure Part 1:
· Work in groups of 3-4
· Use all of your senses except taste to make your observations
· Record all of your observations (be as specific as possible)
· CAREFULLY mix 5ml (approx. 2 spatula loads) of each of the substances in the bag
· CAREFULLY add 2-3 pipettes of phenol red then seal the bag fully
· Gently shake the contents of the bag while holding the bag
· CAREFULLY observe the changes that occur (be aware as the changes will be QUICK)
Procedure Part 2:
· Brainstorm how to determine which reagents caused which change.
· Thoroughly rinse out your bag, then conduct experiments to test your predictions.
7TAWF 3b Lab Report Scaffold.docxDry ice
Dry ice
a Fill a large measuring cylinder with water to the 1 mL mark, or a large beaker to within 5 cm of the top. Add enough indicator to give an easily visible colour.
b Add a few drops of ammonia solution or sodium hydroxide solution to give an alkaline solution. Stir to mix the solution thoroughly.
c Add a few lumps of dry ice. These will sink to the bottom and bubble as gaseous carbon dioxide is produced. A spectacular fog is produced at the top of the cylinder. After several minutes, the colour of the indicator will change.
Test Return
Test Return
Prac Report Writing tasks
Prac Report Writing tasks
Demonstration 7.1
Demonstration 7.1
Forming oxygen, exothermic reaction (Elephant'sToothpaste)
add 30mLs Hydrogen peroxide to large measuring cylinder.
gently add 10mLs detergent, allow to settle into two layers.
trickle red food colouring down one side and green down the other.
add 1/2 spatula of KI crystals and stand back!
bring glowing splint nearby.
check the temperature.
Forming ammonia, endothermic reaction
place beaker on small amount of water on a wooden block.
add small amount barium hydroxide octahydrate powder and ammonium chloride powder in beaker.
check the temperature.
Forming a precipitate
place 5mLs of lead nitrate and 5mLs of potassium iodide in separate test tubes
add one to the other
Prac 7.2 Chemical Reactions
Prac 7.2 Chemical Reactions
Forming a precipitate
place 5 mLs of each of Solutions 1 and 2 in separate test tubes
add one to the other
Forming a gas: hydrogen
add 5mL acid to a test tube
place a small strip of magnesium in the acid
hold gloved hand over the tube
bring match near the top of the test tube
Burning magnesium (combustion)
hold a small strip of magnesium with the metal tongs.
call teacher to light it.
hold it over the drain of the sink.
douse with water to extinguish if needed.
CAUTION do not look directly at the flame, use your side vision.
Forming a gas: carbon dioxide
place small amount of limewater in two test tubes.
place half an antacid tablet in the third test tube.
add 10 mL vinegar to the antacid tablet and observe.
bring the mouths of the antacid tablet test tube and one limewater tube together (transfer gas, not liquid).
gently blow into the top of the second limewater tube.
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