QR Challenge: Ch 3 Chemistry Review
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.
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. _______________ is the act of comparing an unknown quantity to a standard unit | measurement
|
2. A chemist wants to measure the mass of a lump of coal. What SI base unit will he use? | kilogram
| 3. The SI base unit for temperature is the __________. | kelvin
| 4. What is the correct way to abbreviate milliliter? | mL
| 5. What prefix means "billionth"? | nano
| 6. A fraction equal to one that contains both the original unit and its equivalent value in a new unit is called a(n) | conversion factor/unit multiplier
| 7. 25,500 grams equal _____ kilograms. | 25.5
| 8. Using bridge notation, convert 342 mm to decimeters | 3.42
| 9. The smaller the percent error of a measurement is, the more __________ the measurement is. | accurate
| 10. Significant digits apply only to __________ data | measured
| 11. All __________ digits are considered significant in a measurement | nonzero
| 12. How many significant digits are in 137 g? | 3
| 13. How many significant digits are in 4800 cm? | 2
| 14. One gallon of gasoline (3785 mL) has a mass of 2540 g. What is the density of gasoline? Use the correct number of significant digits. | 0.671
| 15. Which of these is not a common step in problem solving? | graduating |
Ch 3 Chemistry Review: QR Challenge
https://www.classtools.net/QR/decode.php?text=________________is_the_act_of_comparing_an_unknown_quantity_to_a_standard_unit
Question 1 (of 15)
Ch 3 Chemistry Review: QR Challenge
https://www.classtools.net/QR/decode.php?text=A_chemist_wants_to_measure_the_mass_of_a_lump_of_coal._What_SI_base_unit_will_he_use?
Question 2 (of 15)
Ch 3 Chemistry Review: QR Challenge
https://www.classtools.net/QR/decode.php?text=The_SI_base_unit_for_temperature_is_the___________.
Question 3 (of 15)
Ch 3 Chemistry Review: QR Challenge
https://www.classtools.net/QR/decode.php?text=What_is_the_correct_way_to_abbreviate_milliliter?
Question 4 (of 15)
Ch 3 Chemistry Review: QR Challenge
https://www.classtools.net/QR/decode.php?text=What_prefix_means_"billionth"?
Question 5 (of 15)
Ch 3 Chemistry Review: QR Challenge
https://www.classtools.net/QR/decode.php?text=A_fraction_equal_to_one_that_contains_both_the_original_unit_and_its_equivalent_value_in_a_new_unit_is_called_a(n)
Question 6 (of 15)
Ch 3 Chemistry Review: QR Challenge
https://www.classtools.net/QR/decode.php?text=25,500_grams_equal_______kilograms.
Question 7 (of 15)
Ch 3 Chemistry Review: QR Challenge
https://www.classtools.net/QR/decode.php?text=Using_bridge_notation,_convert_342_mm_to_decimeters
Question 8 (of 15)
Ch 3 Chemistry Review: QR Challenge
https://www.classtools.net/QR/decode.php?text=The_smaller_the_percent_error_of_a_measurement_is,_the_more____________the_measurement_is.
Question 9 (of 15)
Ch 3 Chemistry Review: QR Challenge
https://www.classtools.net/QR/decode.php?text=Significant_digits_apply_only_to____________data
Question 10 (of 15)
Ch 3 Chemistry Review: QR Challenge
https://www.classtools.net/QR/decode.php?text=All____________digits_are_considered_significant_in_a_measurement
Question 11 (of 15)
Ch 3 Chemistry Review: QR Challenge
https://www.classtools.net/QR/decode.php?text=How_many_significant_digits_are_in_137_g?
Question 12 (of 15)
Ch 3 Chemistry Review: QR Challenge
https://www.classtools.net/QR/decode.php?text=How_many_significant_digits_are_in_4800_cm?
Question 13 (of 15)
Ch 3 Chemistry Review: QR Challenge
https://www.classtools.net/QR/decode.php?text=One_gallon_of_gasoline_(3785_mL)_has_a_mass_of_2540_g._What_is_the_density_of_gasoline?_Use_the_correct_number_of_significant_digits.
Question 14 (of 15)
Ch 3 Chemistry Review: QR Challenge
https://www.classtools.net/QR/decode.php?text=Which_of_these_is_not_a_common_step_in_problem_solving?
Question 15 (of 15)
