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QR Challenge: Period 1 Percent composition

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. First, work out the relative formula mass of the compound, using the Ar values for each element. In the case of sodium hydroxide, these are Na = 23, O = 16, H = 1.Next, divide the Ar of oxygen by the Mr of NaOH, and multiply by 100 to get a percentage.yeah
2. A chemist determines that 1.26 g of iron reacts with 0.54 g of oxygen to form rust. What is the percent composition of each element in the new compoundFe=70% O=30%
3. In the lab, a chemist analyzed a sample of methanol and found that it was made of 6.2 g of carbon, 4.1 g of hydrogen, and 15.9 g of oxygen. What is the percent composition of each element?C=23.7% H=15.6% O=60.7%
4. each element in the table salt?Na=57.4% Cl=42.6%
5. In an experiment, 2.0 moles of oxygen atoms reacts with 80.1 g of calcium to form a new compound. What is the percent composition by mass of each element in the new compound?5%

 


Period 1 Percent composition: QR Challenge

https://www.classtools.net/QR/decode.php?text=First,_work_out_the_relative_formula_mass_of_the_compound,_using_the_Ar_values_for_each_element._In_the_case_of_sodium_hydroxide,_these_are_Na_=_23,_O_=_16,_H_=_1.Next,_divide_the_Ar_of_oxygen_by_the_Mr_of_NaOH,_and_multiply_by_100_to_get_a_percentage.

Question 1 (of 5)

 


Period 1 Percent composition: QR Challenge

https://www.classtools.net/QR/decode.php?text=A_chemist_determines_that_1.26_g_of_iron_reacts_with_0.54_g_of_oxygen_to_form_rust._What_is_the_percent_composition_of_each_element_in_the_new_compound

Question 2 (of 5)

 


Period 1 Percent composition: QR Challenge

https://www.classtools.net/QR/decode.php?text=In_the_lab,_a_chemist_analyzed_a_sample_of_methanol_and_found_that_it_was_made_of_6.2_g_of_carbon,_4.1_g_of_hydrogen,_and_15.9_g_of_oxygen._What_is_the_percent_composition_of_each_element?

Question 3 (of 5)

 


Period 1 Percent composition: QR Challenge

https://www.classtools.net/QR/decode.php?text=each_element_in_the_table_salt?

Question 4 (of 5)

 


Period 1 Percent composition: QR Challenge

https://www.classtools.net/QR/decode.php?text=In_an_experiment,_2.0_moles_of_oxygen_atoms_reacts_with_80.1_g_of_calcium_to_form_a_new_compound._What_is_the_percent_composition_by_mass_of_each_element_in_the_new_compound?

Question 5 (of 5)