# Print

## 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

• Bring these devices into the lesson.

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

## 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!

## 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.

### Question

1. How can you tell from a graph when a reaction has finished?It levels out
2. What does a steeper curve on a graph show?A faster reaction
3. What is the chemical formula for calcium chloride?CaCl2
4. What is the chemical formula for sodium oxide?Na2O
5. Why are atoms always neutral?They have the same number of protons as electrons
6. What acid is needed to make chloride salts?Hydrochloric
7. What salt is formed from magnesium oxide and nitric acid?Magnesium nitrate
8. Why does the mass go down when measuring the rate of a reaction with a balance?Gas is being given off
9. What does the mass number tell us about an atom?The number of protons plus the number of neutrons
10. Write a word equation for magnesium reacting with oxygen.Magnesium + Oxygen --> Magnesium Oxide
11. Between which types of elements does covalent bonding occur?Non-metals
12. What type of structure is formed during ionic bonding?Lattice structure
13. Explain how ionic bonding works.The metal atom gives electrons to the non-metals atom becoming a positive ion and making the non-metal a negative ion.
14. What are ions?Charged particles
15. What is the term for a reaction which released heat energy?Exothermic
16. What are the 3 types of bases?Metal oxide, metal hydroxide and metal carbonate
17. What type of reaction takes place when a base reacts with an acid?Neutralisation
18. What is the term given to elements with the same atomic number but different mass numbers?Isotopes
19. Name 2 ways to speed up a chemical reactionIncrease concentration, temperature, surface area, decrease particle size, add a catalyst.
20. What is the main gas to cause acid rain?Sulfur dioxide
21. BONUS QUESTION: Name the 3 types of rocks!Igneous, Sedimentary and Metamorphic

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