QR Challenge: AQA Core Chemistry pre-exam

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. Name the three particles found inside an atom.	Protons, neutrons and electrons
2. Which elements have the symbols Na, H, O, Mg, Fe and Cu?	Sodium, hydrogen, oxygen, magnesium, iron and copper.
3. What is the mass of a proton, neutron and electron?	Proton=1, neutron=1,electron=very small or 1/2000
4. What is the charge of a proton, neutron and electron?	Proton=+1, neutron=0 and electron=-1
5. Draw the electron structure of sulfur (16 electrons).	2,8,6
6. What happens to the reactivity of group 1 metals as you go down the group?	They become more reactive down the group.
7. Why are the elements in group 0 (the noble gases) are very unreactive?	They already have full outer electron shells.
8. What type of bonding occurs between metals and non metals?	Ionic
9. What is the main compound in limestone?	Calcium carbonate
10. Give two disadvantages of quarrying for limestone.	Noise pollution, dust pollution, increase in traffic, damage to roads
11. What is thermal decomposition?	Using heat to break down a compound.
12. Write the word equation for the thermal decomposition of calcium carbonate.	CaCO3 --> CaO +CO2
13. What is the chemical test for carbon dioxide?	Limewater (colourless to cloudy)
14. What ingredients are needed to make cement powder?	Limestone and powdered clay.
15. What is an ore?	A rock containing enough metal to make it economically sensible to extract it.
16. Describe two ways to extract copper form its ore.	Carbon reduction and electrolysis.
17. What is phytomining?	Using plants to extract metal ions form low grade sources.
18. What is an alloy?	A mixture of at metals and possibly some non metal element.
19. How is crude oil separated?	Fractional distillation, heat, vaporising and condensing
20. What is an alkane?	A hydrocarbon containing single carbon to carbon bonds.
21. Give the general formula of an alkane.	CnH2n+2
22. Describe the causes and effects of global warming.	CO2, trapped heat, higher global temperatures, rising sea levels
23. What is cracking and why is it necessary?	Breaking down large alkane chains using heat and a catalyst. It makes smaller, more useful alkanes and alkenes
24. What are the building blocks of polymers called?	Monomers
25. What are the two methods used to produce ethanol?	Fermentation(yeast+sugar) and hydration(alkenes+steam)
26. How do you extract oil from seeds and nuts?	Crush, filter and distil
27. What is an emulsion?	A mixture of two liquids which do not naturally dissolve into one-another.
28. Describe the job of an emulsifier.	Holds and emulsion together using a hydrophilic head (loves water) and hydrophobic tail (hates water)
29. How do you test for an unsaturated oil?	Use bromine water, it turns orange to colourless.
30. Name the layers of inner Earth.	Crust, mantle and core
31. Where do earthquakes and volcanoes occur?	At plate boundaries
32. Give two pieces of evidence to back up Alfred Wegener's theory of continental drift.	Similar fossils, continent shape like a jigsaw.
33. Which gases make up the Earth's current atmosphere?	Nitrogen, oxygen, carbon dioxide, argon
34. Where did the majority of the carbon dioxide in the early atmosphere go?	Used by plants for photosynthesis over millions of years.

 

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