QR Challenge: Chemical Reactions

Created using the ClassTools QR Treasure Hunt Generator

Teacher Notes

A. Prior to the lesson:

1. Arrange students into groups. Each group needs at least ONE person who has a mobile device.

2. If their phone camera doesn't automatically detect and decode QR codes, ask students to

• Download a QR reader (e.g. I-Nigma | NeoReader | Kaywa) onto their mobile devices
• Bring these devices into the lesson.

3. Print out the QR codes.

4. Cut them out and place them around your class / school.

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B. The lesson:

1. Give each group a clipboard and a piece of paper so they can write down the decoded questions and their answers to them.

2. Explain to the students that the codes are hidden around the school. Each team will get ONE point for each question they correctly decode and copy down onto their sheet, and a further TWO points if they can then provide the correct answer and write this down underneath the question.

3. Away they go! The winner is the first team to return with the most correct answers in the time available. This could be within a lesson, or during a lunchbreak, or even over several days!

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C. TIPS / OTHER IDEAS

4. A detailed case study in how to set up a successful QR Scavenger Hunt using this tool can be found here.

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Questions / Answers (teacher reference)

Question	Answer
1. What are the products when acids react with metals?	salt plus hydrogen
2. What are the products when you react an acid and an alkali?	salt plus water
3. If calcium carbonate is dissolved in water, what will the pH of the solution be?	anything between 7-14
4. Sodium hydroxide + Hydrochloric acid reacts to form what?	Sodium chloride and water
5. Lithium hydroxide + sulfuric acid react together to form what?	lithium sulfate plus water
6. The electolysis of brine solution produces which useful chemicals?	Chlorine, sodium hydroxide and hydrogen.
7. Limewater is the test for which gas?	carbon dioxide
8. How do you test for hydrogen gas?	with a lighted splint - the squeaky pop test
9. Chlorine gas smells. What does it remind you of?	swimming pools or bleach
10. What are the uses of alkalis in industry?	to make soap, fix dyes, to make bleach and cleaning products
11. Name three ways to get salt.	Solution mining, mining rock salt, sea salt by evaporation.
12. The Leblanc process is dirty and polluting. Explain why.	it produces hydrogen chloride which is an acidic gas. It also produces sodium sulfide. this reacts with the hydrogen chloride when it falls as rain, producing a very smelly hydrogen sulfide gas.
13. Clorine is used as a water treatment chemical. Are there any risks associated with this?	yes, chlorine can react with organic matter in the water to produce THCs, poisonous chemicals.
14. Cholera is a dangerous disease. How do they prevent the spread of this disease?	put chlorine into the water supply to kill the disease.
15. DDT is a dangerous chemicals that do not break down in the environment.What are the risks associated with these chemicals?	they harm predators

 

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