Detailed Case Study Search the Archive Feedback

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.

4. Cut them out and place them around your class / school.

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!

4. A detailed case study in how to set up a successful QR Scavenger Hunt using this tool can be found here.

## Question | ## Answer |

1. 1. A certain mass of gas in a 2.00 L container has a pressure of 164 kPa. Calculate the new pressure of the gas if the volume of the container is reduced to 1.00L | 328kPa |

2. 2. A balloon is filled with a gas at a pressure of 102 kPa and its volume is determined to be 1.37L. Calculate the volume of the balloon if the pressure increases to 110kPa after more gas is added. | 1.27L |

3. 3. A balloon is filled with helium gas to a volume of 1.20 L and a temperature of 15 degrees Celsius. If the pressure remains constant and you take the balloon outside where the temperature is - 15 degrees Celsius, calculate the new volume of the balloon. | 1.08L |

4. 4. A balloon contains 5.00L of air at 25 degrees Celsius. Deduce at what temperature the balloon will shrink to half that volume. Assume that the pressure is held constant. | 149K |

5. 5. A steel cylinder with a volume of 450 mL contains a gas at a pressure of 520 kPa at 25 degrees Celsius. If the cylinder is heated to 410 degrees Celsius, determine what the new pressure will be. | 1190kPa |

6. 6. A glass vessel that can only withstand a maximum internal pressure of 225 kPa is filled with gas at 21 degrees Celsius and 100.0 kPa and then heated. Calculate at what temperature the vessel will burst. | 662K |

7. 7. When a helium balloon deflates over time this is an example of? | effusion |

8. 8. An aerosol can with a volume of 325 mL contains propellant gas at 445 kPa and 12 degrees Celsius. Calculate the volume that the gas would occupy if it were allowed to escape at 101 kPa and 21 degrees Celsius. | 1.48 L |

9. 9. A weather balloon contains 15.0 L of helium at a pressure of 97.6 kPa and a temperature of 11 degrees Celsius. If this gas was stored in a 1.00 L cylinder at 19 degrees Celsius determine the pressure that must have been in the cylinder. | 1.5 x 10^3 kPa |

10. 10. A gas cylinder with a capacity of 105 L contains helium at a pressure of 6.70 MPa and a temperature of 27 degrees Celsius. Calculate the mass of helium gas in the cylinder. | 1.13 x 10^3 g |

11. 11.Determine the pressure that 20.0 of solid carbon dioxide gas will exert if it vaporizes in an evacuated 2.00 L container at 18 degrees Celsius. | 549 kPa |

12. 12. A flask contains 0.50 mol of nitrogen gas and 2.50 mol of carbon dioxide gas. The total pressure in the flask is 150 kPa. Determine the partial pressure of each gas. | partial pressure of nitrogen is 25 kPa and carbon dioxide is 125 kPa |

13. 13. Sulphur burns in fluorine to form gaseous sulphur hexafluoride. What volume of fluorine is needed to produce 125 mL of sulphur hexafluoride at the same temperate and pressure? | 375mL(p.387) |

14. 14. Sulphur burns in oxygen to form sulphur dioxide. What volume of gas will be produced at SATP when 14.0 g of sulphur are burned in excess oxygen? | 10.8 L |

15. 15. Silicon burns in fluorine gas to produce silicon tetrafluoride. Calculate the minimum volume of fluorine gas needed to completely react with 5.0 g of silicon powder at STP. | 8.0L |

16. 16. In an experiment, a student collects 375 mL of dinitrogen oxide gas at 19 degrees Celsius and 100.2kPa. Calculate the mass of dinitrogen oxide gas that has been collected. The vapour pressure of water at 19 degrees Celsius is 2.2 kPa. | 0.667 g |

17. 17. What is the depth of the stratosphere? | 40 km |

18. 18. What part of the atmosphere is our home? | the troposphere |

19. 19. What are nature's atmospheric detergents? | hydroxides and nitrates |

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