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QR Challenge: Gas Stoichiometry1

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. 1. Given the following reaction: NH4NO2 (s) N2 (g) + 2H2O (g) How many liters of nitrogen gas is produced if 50.0L of water is produced at STP? 25.0L of N2
2. 2. Given the following reaction: CuO (s) + H2 (g)  Cu (s) + H2O (g) If 250. L of hydrogen gas are used to reduce copper (II) oxide at STP, what mass of copper is to be expected? 709g copper
3. 3. How many grams of solid lithium must be added to liquid water in order to obtain 15.0 L of hydrogen gas at STP? 2 Li + 2H2O --> 2LiOH + H2 9.29g lithium.
4. 4. Calculate the volume of hydrogen gas at produced by the reaction of 0.52 grams of solid magnesium with excess hydrochloric acid. Mg + 2HCl --> MgCl2 + H2 0.48 L hydrogen gas
5. 5.How many liters of hydrogen gas are needed to react completely with 50.0 L of chlorine gas at STP? H2 + Cl2 ---> 2HCl 50.0 L hydrogen gas

 


Gas Stoichiometry1: QR Challenge

https://www.classtools.net/QR/decode.php?text=1._Given_the_following_reaction:_NH4NO2_(s)_N2_(g)_+_2H2O_(g)_How_many_liters_of_nitrogen_gas_is_produced_if_50.0L_of_water_is_produced_at_STP?

Question 1 (of 5)

 


Gas Stoichiometry1: QR Challenge

https://www.classtools.net/QR/decode.php?text=2._Given_the_following_reaction:_CuO_(s)_+_H2_(g)__Cu_(s)_+_H2O_(g)_If_250._L_of_hydrogen_gas_are_used_to_reduce_copper_(II)_oxide_at_STP,_what_mass_of_copper_is_to_be_expected?

Question 2 (of 5)

 


Gas Stoichiometry1: QR Challenge

https://www.classtools.net/QR/decode.php?text=3._How_many_grams_of_solid_lithium_must_be_added_to_liquid_water_in_order_to_obtain_15.0_L_of_hydrogen_gas_at_STP?__2_Li_+_2H2O_-->_2LiOH_+_H2

Question 3 (of 5)

 


Gas Stoichiometry1: QR Challenge

https://www.classtools.net/QR/decode.php?text=4._Calculate_the_volume_of_hydrogen_gas_at_produced_by_the_reaction_of_0.52_grams_of_solid_magnesium_with_excess_hydrochloric_acid._Mg_+_2HCl_-->_MgCl2_+_H2

Question 4 (of 5)

 


Gas Stoichiometry1: QR Challenge

https://www.classtools.net/QR/decode.php?text=5.How_many_liters_of_hydrogen_gas_are_needed_to_react_completely_with_50.0_L_of_chlorine_gas_at_STP?__H2_+_Cl2_--->_2HCl

Question 5 (of 5)