QR Challenge: Understanding Acids and Bases

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. 1. What does it mean if a compound has a solubility of 15g in 100g of water at 0 degrees	15g of the compound will dissolve in 100 g of water at 0 degrees.
2. 2. What is most likely used for a base	making soaps and detergents
3. 3. What does a neutralization reaction produce	water and salt
4. 4. In water, bases form	hydroxide ions
5. 5. Acids are described as corrosive because	they eat away at other materials
6. 6. Weak tea is an example of	a diluted solution
7. 7. The process that breaks down complex molecules of food are	digestion
8. 8. What do enzymes in the digestive system do	speed up chemical digestion
9. 9. How is pH important during digestion	different enzymes work best at different pH values
10. 10.How is solute different from a solvent in a solution	the solute is present in a smaller amount
11. 11.Which is a characteristic property of acids	They turn blue litmus paper red
12. 12.Which process tears, grinds, and mashes large food particles	mechanical digestion
13. 13.Compared to the pH of the mouth and the small intestine, the pH of the stomach is	lower
14. 14.What is one way to increase the solubility of sugar in water	heat the water
15. 15.When a solute is added to solvent, the freezing point of the solution is	lower than the freezing point of either substance alone
16. 16.Scientist can tell whether a solution is salt in water or sugar in water	by testing the conductivity of the solution
17. 17. When a compound dissolves in water	each of its particles become surrounded by water molecules
18. 18. When you add so much solute that no more dissolves, you have a	saturated solution
19. 19.A measure of how well a solute can dissolve in a solvent at a given temperature is	solubility
20. 20.If a few spoonfuls of sugar are mixed into a cup of water, sugar is	solute

 

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