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QR Challenge: 1

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. What is the empirical formula of a sulphur oxide containing 6.42g of sulphur and 3.20g of oxygen? SO
2. What is the empirical formula of an organic compound containing 10.8g of carbon, 2.4g of hydrogen and 4.8g of oxygen? C3H8O
3. What is the empirical formula of an oxide of nitrogen containing 63.61% by mass of nitrogen and 36.69% by mass of oxygen? N2O
4. What is the empirical formula of a hydrocarbon containing 85.7% by mass of carbon and 14.3% by mass of hydrogen? CH2
5. What is the molecular formula of aluminium chloride, containing 20.2% by mass of aluminium and 79.8% by mass of chlorine? The Mr of the compound is 267.0 Al2Cl6
6. What is the molecular formula of a compound containing 25.6g of oxygen, 12.6g of sulfur and 0.4g of hydrogen? The Mr of the compound is 194.2 H2S2O8
7. What is the empirical formula of a compound of sodium, chlorine and oxygen, which contains, by mass, 21.6% Na, 33.3% Cl and 45.1% O. NaClO3.
8. The percentage composition by mass of and inorganic compound was found to be 36.5% sodium, 25.4% sulphur, 38.1% oxygen. Calculate the empirical formula of the compound. Na2SO3
9. Compound A is an alcohol. Analysis of A shows that it contains 68.2% carbon and 13.6% hydrogen. The remaining mass is oxygen. Calculate he empirical formula of the alcohol. C5H12O
10. Compound B contains 31.84% potassium, 28.98% chlorine and the remainder is oxygen. Calculate the empirical formula of B KClO3

 


1: QR Challenge

https://www.classtools.net/QR/decode.php?text=What-is-the-empirical-formula-of-a-sulphur-oxide-containing-6.42g-of-sulphur-and-3.20g-of-oxygen?

Question 1 (of 10)

 


1: QR Challenge

https://www.classtools.net/QR/decode.php?text=What-is-the-empirical-formula-of-an-organic-compound-containing-10.8g-of-carbon,-2.4g-of-hydrogen-and-4.8g-of-oxygen?

Question 2 (of 10)

 


1: QR Challenge

https://www.classtools.net/QR/decode.php?text=What-is-the-empirical-formula-of-an-oxide-of-nitrogen-containing-63.61%-by-mass-of-nitrogen-and-36.69%-by-mass-of-oxygen?

Question 3 (of 10)

 


1: QR Challenge

https://www.classtools.net/QR/decode.php?text=What-is-the-empirical-formula-of-a-hydrocarbon-containing-85.7%-by-mass-of-carbon-and-14.3%-by-mass-of-hydrogen?

Question 4 (of 10)

 


1: QR Challenge

https://www.classtools.net/QR/decode.php?text=What-is-the-molecular-formula-of-aluminium-chloride,-containing-20.2%-by-mass-of-aluminium-and-79.8%-by-mass-of-chlorine?--The-Mr-of-the-compound-is-267.0

Question 5 (of 10)

 


1: QR Challenge

https://www.classtools.net/QR/decode.php?text=What-is-the-molecular-formula-of-a-compound-containing-25.6g-of-oxygen,-12.6g-of-sulfur-and-0.4g-of-hydrogen?-The-Mr-of-the-compound-is-194.2

Question 6 (of 10)

 


1: QR Challenge

https://www.classtools.net/QR/decode.php?text=What-is-the-empirical-formula-of-a-compound-of-sodium,-chlorine-and-oxygen,-which-contains,-by-mass,-21.6%-Na,-33.3%-Cl-and-45.1%-O.

Question 7 (of 10)

 


1: QR Challenge

https://www.classtools.net/QR/decode.php?text=The-percentage-composition-by-mass-of-and-inorganic-compound-was-found-to-be-36.5%-sodium,-25.4%-sulphur,-38.1%-oxygen.-Calculate-the-empirical-formula-of-the-compound.

Question 8 (of 10)

 


1: QR Challenge

https://www.classtools.net/QR/decode.php?text=Compound-A-is-an-alcohol.-Analysis-of-A-shows-that-it-contains-68.2%-carbon-and-13.6%-hydrogen.-The-remaining-mass-is-oxygen.--Calculate-he-empirical-formula-of-the-alcohol.

Question 9 (of 10)

 


1: QR Challenge

https://www.classtools.net/QR/decode.php?text=Compound-B-contains-31.84%-potassium,-28.98%-chlorine-and-the-remainder-is-oxygen.-Calculate-the-empirical-formula-of-B

Question 10 (of 10)