QR Challenge: Physical & Chemical Changes
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. What is a physical change | occurs when a substances appearance is changed
|
2. What is a chemical change | a new substance is formed
| 3. A solid changing to a liquid is a physical or chemical change | physical
| 4. If an object sinks, describe the density of the object | greater than 1.0g/mL
| 5. Calculate the density of a 60g object with a volume of 6mL | 10g/mL
| 6. What is formed when two liquids mix and form a solid | precipitate
| 7. Toast burning, physical or chemical change | chemical
| 8. A change in the state of matter is a physical or chemical change | physical
| 9. Characteristics that can be observed without changing the identity of a substance | physical property
| 10. A change that alters the identity of a substance is what kind of change | chemical
| 11. Pancakes cook is a physical or chemical change | chemical
| 12. Mixing salt and pepper is a physical or chemical change | physical
| 13. A bicycle rusting is a physical or chemical change | chemical
| 14. Chocolate syrup is dissolved in milk is a physical or chemical change | physical
| 15. Baking sode reaacts with vinegar by fizzing is a physical or chemical change | chemical
| 16. Grass grows is a physical or chemical change | physical
| 17. Food is digested is a physical or chemical change | chemical
| 18. A marshmallow is toasted over a campfire is a physical or chemical change | physical |
Physical & Chemical Changes: QR Challenge
https://www.classtools.net/QR/decode.php?text=What_is_a_physical_change
Question 1 (of 18)
Physical & Chemical Changes: QR Challenge
https://www.classtools.net/QR/decode.php?text=What_is_a_chemical_change
Question 2 (of 18)
Physical & Chemical Changes: QR Challenge
https://www.classtools.net/QR/decode.php?text=A_solid_changing_to_a_liquid_is_a_physical_or_chemical_change
Question 3 (of 18)
Physical & Chemical Changes: QR Challenge
https://www.classtools.net/QR/decode.php?text=If_an_object_sinks,_describe_the_density_of_the_object
Question 4 (of 18)
Physical & Chemical Changes: QR Challenge
https://www.classtools.net/QR/decode.php?text=Calculate_the_density_of_a_60g_object_with_a_volume_of_6mL
Question 5 (of 18)
Physical & Chemical Changes: QR Challenge
https://www.classtools.net/QR/decode.php?text=What_is_formed_when_two_liquids_mix_and_form_a_solid
Question 6 (of 18)
Physical & Chemical Changes: QR Challenge
https://www.classtools.net/QR/decode.php?text=Toast_burning,_physical_or_chemical_change
Question 7 (of 18)
Physical & Chemical Changes: QR Challenge
https://www.classtools.net/QR/decode.php?text=A_change_in_the_state_of_matter_is_a_physical_or_chemical_change
Question 8 (of 18)
Physical & Chemical Changes: QR Challenge
https://www.classtools.net/QR/decode.php?text=Characteristics_that_can_be_observed_without_changing_the_identity_of_a_substance
Question 9 (of 18)
Physical & Chemical Changes: QR Challenge
https://www.classtools.net/QR/decode.php?text=A_change_that_alters_the_identity_of_a_substance_is_what_kind_of_change
Question 10 (of 18)
Physical & Chemical Changes: QR Challenge
https://www.classtools.net/QR/decode.php?text=Pancakes_cook_is_a_physical_or_chemical_change
Question 11 (of 18)
Physical & Chemical Changes: QR Challenge
https://www.classtools.net/QR/decode.php?text=Mixing_salt_and_pepper_is_a_physical_or_chemical_change
Question 12 (of 18)
Physical & Chemical Changes: QR Challenge
https://www.classtools.net/QR/decode.php?text=A_bicycle_rusting_is_a_physical_or_chemical_change
Question 13 (of 18)
Physical & Chemical Changes: QR Challenge
https://www.classtools.net/QR/decode.php?text=Chocolate_syrup_is_dissolved_in_milk_is_a_physical_or_chemical_change
Question 14 (of 18)
Physical & Chemical Changes: QR Challenge
https://www.classtools.net/QR/decode.php?text=Baking_sode_reaacts_with_vinegar_by_fizzing_is_a_physical_or_chemical_change
Question 15 (of 18)
Physical & Chemical Changes: QR Challenge
https://www.classtools.net/QR/decode.php?text=Grass_grows_is_a_physical_or_chemical_change
Question 16 (of 18)
Physical & Chemical Changes: QR Challenge
https://www.classtools.net/QR/decode.php?text=Food_is_digested_is_a_physical_or_chemical_change
Question 17 (of 18)
Physical & Chemical Changes: QR Challenge
https://www.classtools.net/QR/decode.php?text=A_marshmallow_is_toasted_over_a_campfire_is_a_physical_or_chemical_change
Question 18 (of 18)