QR Challenge: Physical & Chemical Changes

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 is a physical change	occurs when a substances appearance is changed
2. What is a chemical change	a new substance is formed
3. A solid changing to a liquid is a physical or chemical change	physical
4. If an object sinks, describe the density of the object	greater than 1.0g/mL
5. Calculate the density of a 60g object with a volume of 6mL	10g/mL
6. What is formed when two liquids mix and form a solid	precipitate
7. Toast burning, physical or chemical change	chemical
8. A change in the state of matter is a physical or chemical change	physical
9. Characteristics that can be observed without changing the identity of a substance	physical property
10. A change that alters the identity of a substance is what kind of change	chemical
11. Pancakes cook is a physical or chemical change	chemical
12. Mixing salt and pepper is a physical or chemical change	physical
13. A bicycle rusting is a physical or chemical change	chemical
14. Chocolate syrup is dissolved in milk is a physical or chemical change	physical
15. Baking sode reaacts with vinegar by fizzing is a physical or chemical change	chemical
16. Grass grows is a physical or chemical change	physical
17. Food is digested is a physical or chemical change	chemical
18. A marshmallow is toasted over a campfire is a physical or chemical change	physical

 

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