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QR Challenge: Solutions

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. Which element in a water molecule has a slightly positive charge?hydrogen
2. 2. What does the phrase "like dissolves like" mean?Things with similar properties tend to dissolve in each other
3. 3. LiOH is an ionic molecule. Would it be more likely to dissolve in water or acetone?water
4. 4. 10mL of ethanol is dissolved in 40mL of water. Which substance is the solute?ethanol
5. 5. What are hydrogen bonds?the attraction between partial charges in molecules with H bonded to F, O, or N
6. 6. What is cohesion?molecules being attracted to each other
7. 7. What is adhesion?molecules being attracted to different molecules
8. 8. Which property of water explains why it forms droplets?cohesion
9. 9. What is surface tension?attraction of molecules that keeps them from escaping the surface
10. 10. When an ionic substance dissolves it separates into ions that are surrounded be a shell of water. The metal ion is positive - which element in water surrounds it to cause it to dissolve?oxygen
11. 11. If a substance is soluble in water but is a nonelectrolyte, what type of solute is it most likely?polar covalent
12. 12. If a substance is insoluble in water, what kind of solute is it most likely?nonpolar
13. 13. If a substance is soluble in water and is an electrolyte, what type of solute is it most likely?ionic
14. 14. True or false: Only solids and liquids can be solutions.False
15. 15. What is a solution?a homogeneous mixture
16. 16. What does it mean to say a substance is nonpolar?the elements in the compound share electrons equally and there is no partial charge
17. 17. What causes polarity?a difference in electronegativity
18. 18. What is electronegativity?the pull an element has on an electron in a bond
19. 19. Why is water called the universal solvent?it has unique properties that allow it to dissolve a variety of substances
20. 20. True or false: pure water is an electrolyte.false

 


Solutions: QR Challenge

https://www.classtools.net/QR/decode.php?text=1._Which_element_in_a_water_molecule_has_a_slightly_positive_charge?

Question 1 (of 20)

 


Solutions: QR Challenge

https://www.classtools.net/QR/decode.php?text=2._What_does_the_phrase_"like_dissolves_like"_mean?

Question 2 (of 20)

 


Solutions: QR Challenge

https://www.classtools.net/QR/decode.php?text=3._LiOH_is_an_ionic_molecule._Would_it_be_more_likely_to_dissolve_in_water_or_acetone?

Question 3 (of 20)

 


Solutions: QR Challenge

https://www.classtools.net/QR/decode.php?text=4._10mL_of_ethanol_is_dissolved_in_40mL_of_water._Which_substance_is_the_solute?

Question 4 (of 20)

 


Solutions: QR Challenge

https://www.classtools.net/QR/decode.php?text=5._What_are_hydrogen_bonds?

Question 5 (of 20)

 


Solutions: QR Challenge

https://www.classtools.net/QR/decode.php?text=6._What_is_cohesion?

Question 6 (of 20)

 


Solutions: QR Challenge

https://www.classtools.net/QR/decode.php?text=7._What_is_adhesion?

Question 7 (of 20)

 


Solutions: QR Challenge

https://www.classtools.net/QR/decode.php?text=8._Which_property_of_water_explains_why_it_forms_droplets?

Question 8 (of 20)

 


Solutions: QR Challenge

https://www.classtools.net/QR/decode.php?text=9._What_is_surface_tension?

Question 9 (of 20)

 


Solutions: QR Challenge

https://www.classtools.net/QR/decode.php?text=10._When_an_ionic_substance_dissolves_it_separates_into_ions_that_are_surrounded_be_a_shell_of_water._The_metal_ion_is_positive_-_which_element_in_water_surrounds_it_to_cause_it_to_dissolve?

Question 10 (of 20)

 


Solutions: QR Challenge

https://www.classtools.net/QR/decode.php?text=11._If_a_substance_is_soluble_in_water_but_is_a_nonelectrolyte,_what_type_of_solute_is_it_most_likely?

Question 11 (of 20)

 


Solutions: QR Challenge

https://www.classtools.net/QR/decode.php?text=12._If_a_substance_is_insoluble_in_water,_what_kind_of_solute_is_it_most_likely?

Question 12 (of 20)

 


Solutions: QR Challenge

https://www.classtools.net/QR/decode.php?text=13._If_a_substance_is_soluble_in_water_and_is_an_electrolyte,_what_type_of_solute_is_it_most_likely?

Question 13 (of 20)

 


Solutions: QR Challenge

https://www.classtools.net/QR/decode.php?text=14._True_or_false:_Only_solids_and_liquids_can_be_solutions.

Question 14 (of 20)

 


Solutions: QR Challenge

https://www.classtools.net/QR/decode.php?text=15._What_is_a_solution?

Question 15 (of 20)

 


Solutions: QR Challenge

https://www.classtools.net/QR/decode.php?text=16._What_does_it_mean_to_say_a_substance_is_nonpolar?

Question 16 (of 20)

 


Solutions: QR Challenge

https://www.classtools.net/QR/decode.php?text=17._What_causes_polarity?

Question 17 (of 20)

 


Solutions: QR Challenge

https://www.classtools.net/QR/decode.php?text=18._What_is_electronegativity?

Question 18 (of 20)

 


Solutions: QR Challenge

https://www.classtools.net/QR/decode.php?text=19._Why_is_water_called_the_universal_solvent?

Question 19 (of 20)

 


Solutions: QR Challenge

https://www.classtools.net/QR/decode.php?text=20._True_or_false:_pure_water_is_an_electrolyte.

Question 20 (of 20)