QR Challenge: Chemistry

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. Why did it take so long for scientists to prove that matter was made of atoms?	Scientists couldn't see them, so they had to come up (slowly) with experiments that showed how atoms were designed.
2.
3. What part of the atom did each of the following discover?2	Thompson - electron, Rutherford - nucleus, Chadwick - neutrons2
4.
5. Why doesn’t matter usually exist in the plasma state on Earth?3	Not hot enough3
6.
7. Why do atoms of liquids allow them to flow?4	Because the molecules that the atoms make up can move past each other; they are not in a rigid configuration4
8.
9. What is sublimation?5	The process by which a solid turns directly into a gas (skipping the liquid state).5
10.
11. List five physical properties of a pencil.6	Six-sided, a graphite center, yellow color, wooden, rubber eraser, marks on paper, lightweight, etc.6
12.
13. What are two chemical properties of iron?7	Iron combines with oxygen to form iron oxide (rust) and has extra electrons left over when it forms a metallic bond.7
14.
15. Suppose a geologist finds a mineral that is unknown to him or her. Which type of property would he probably use first to identify the sample? Explain.8	Physical properties, because they are visible.8
16.
17. Describe three physical changes you could do to a piece of chalk.9	Break it, dissolve it with vinegar, dip it in red paint, rub it so that it is square and not cylindrical.9
18.
19. Is dissolving a teaspoon of salt in a glass of water a physical or chemical change? Explain.10	Physical. What happened to the salt is that it dissolved, but it did not cease to be salt.10
20.
21. Explain why a burning piece of paper quits burning.11	There are no more materails to combine with oxygen and burn.11

 

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