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QR Challenge: Methods of Separating Mixtures

Created using the ClassTools QR Treasure Hunt Generator

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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

3. Print out the QR codes.

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.

Questions / Answers (teacher reference)

Question

Answer

1. Tiny metal shards have fallen onto the sandy floor of a workshop. How could the teacher clean the sandy floor of the dangerous metal pieces?magnet
2. To improve the icy road conditions, a sand-salt mixture has been used on the highways all winter. The spring cleanup crew has scooped up the mixture and would like to use the sand for road construction, but the workers must first remove the salt from the sand. How could they get the salt out?Add water to dissolve salt and decant liquid
3. Pens were taken away from three people who were suspected of forging a signature on stolen cheques. How could we figure out which pen was used to forge a signature on the stolen cheque?Chromatography
4. You are stranded on a deserted island in the Pacific Ocean. There is no fresh drinking water, only salt water from the ocean. How could you clean the salt out of the ocean water, to get clean drinking water?Distill the water
5. A gardener would like to use some soil from the backyard to start some seeds but there are a lot of stones in it. How could the stones be removed in a quick and easy manner?Use screens for sifting
6. A person would like to make a glass of fresh pulpless orange juice. What method could the person use?Strain and filter the juice
7. A community by the ocean would like to set up a small business that sells salt and pepper. Farmers are already growing peppers to be dried and used in the business but there are no salt mines within the area. Someone has suggested getting the salt from the salt water of the ocean. How could this be done?Evaporate the water and collect the salt that remains

 


Methods of Separating Mixtures: QR Challenge

https://www.classtools.net/QR/decode.php?text=Tiny-metal-shards-have-fallen-onto-the-sandy-floor-of-a-workshop.--How-could-the-teacher-clean-the-sandy-floor-of-the-dangerous-metal-pieces?

Question 1 (of 7)

 


Methods of Separating Mixtures: QR Challenge

https://www.classtools.net/QR/decode.php?text=To-improve-the-icy-road-conditions,-a-sand-salt-mixture-has-been-used-on-the-highways-all-winter.--The-spring-cleanup-crew-has-scooped-up-the-mixture-and-would-like-to-use-the-sand-for-road-construction,-but-the-workers-must-first-remove-the-salt-from-the-sand.--How-could-they-get-the-salt-out?

Question 2 (of 7)

 


Methods of Separating Mixtures: QR Challenge

https://www.classtools.net/QR/decode.php?text=Pens-were-taken-away-from-three-people-who-were-suspected-of-forging-a-signature-on-stolen-cheques.--How-could-we-figure-out-which-pen-was-used-to-forge-a-signature-on-the-stolen-cheque?

Question 3 (of 7)

 


Methods of Separating Mixtures: QR Challenge

https://www.classtools.net/QR/decode.php?text=You-are-stranded-on-a-deserted-island-in-the-Pacific-Ocean.--There-is-no-fresh-drinking-water,-only-salt-water-from-the-ocean.--How-could-you-clean-the-salt-out-of-the-ocean-water,-to-get-clean-drinking-water?

Question 4 (of 7)

 


Methods of Separating Mixtures: QR Challenge

https://www.classtools.net/QR/decode.php?text=A-gardener-would-like-to-use-some-soil-from-the-backyard-to-start-some-seeds-but-there-are-a-lot-of-stones-in-it.--How-could-the-stones-be-removed-in-a-quick-and-easy-manner?

Question 5 (of 7)

 


Methods of Separating Mixtures: QR Challenge

https://www.classtools.net/QR/decode.php?text=A-person-would-like-to-make-a-glass-of-fresh-pulpless-orange-juice.--What-method-could-the-person-use?

Question 6 (of 7)

 


Methods of Separating Mixtures: QR Challenge

https://www.classtools.net/QR/decode.php?text=A-community-by-the-ocean-would-like-to-set-up-a-small-business-that-sells-salt-and-pepper.--Farmers-are-already-growing-peppers-to-be-dried-and-used-in-the-business-but-there-are-no-salt-mines-within-the-area.--Someone-has-suggested-getting-the-salt-from-the-salt-water-of-the-ocean.--How-could-this-be-done?

Question 7 (of 7)