# Print

## 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

• Bring these devices into the lesson.

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.

### Question

1. What is the trend in the first ionisation energy across a period from left to right and why is the second ionisation energy of sodium so much greater than its first ionisation energy?1
2.
3.
4. On crossing the Periodic Table, there are trends in the sizes of atoms and ions, why is the atomic size of chlorine less than that of sodium2
5.
6.
7. Why do metallic solids such as sodium conduct electricity3
8.
9.
10. Ionisation energies provide information about the structure of atoms, write the equation, showing state symbols, for the first ionisation energy of sodium.3
11.
12. Although propane and ethanol have similar molecular masses, the alkane is a gas at room temperature while the ethanol is a liquid, this difference in boiling point is due to the different strengths of the intermolecular forces in the two compounds, explain why propane is a gas at room temperature while ethanol is a liquid. In your answer you should name the intermolecular forces involved in each compound and explain how they arise.4
13.
14. Carbon monoxide and oxides of nitrogen are pollutants present in the exhaust gases from petrol engines, explain how carbon monoxide forms in a petrol engine and oxides of nitrogen form in a petrol engine5
15.
16. A catalytic converter fitted to a car exhaust will turn these pollutant gases into less harmful gases, name the gases formed from the carbon monoxide and oxides of nitrogen, name a metal used as a catalyst in a catalytic converter.5

### Unit 1 Unit 2: QR Challenge

Question 1 (of 16)

### Unit 1 Unit 2: QR Challenge

Question 2 (of 16)

### Unit 1 Unit 2: QR Challenge

Question 3 (of 16)

### Unit 1 Unit 2: QR Challenge

Question 4 (of 16)

### Unit 1 Unit 2: QR Challenge

Question 5 (of 16)

### Unit 1 Unit 2: QR Challenge

Question 6 (of 16)

### Unit 1 Unit 2: QR Challenge

Question 7 (of 16)

### Unit 1 Unit 2: QR Challenge

Question 8 (of 16)

### Unit 1 Unit 2: QR Challenge

Question 9 (of 16)

### Unit 1 Unit 2: QR Challenge

Question 10 (of 16)

### Unit 1 Unit 2: QR Challenge

Question 11 (of 16)

### Unit 1 Unit 2: QR Challenge

Question 12 (of 16)

### Unit 1 Unit 2: QR Challenge

Question 13 (of 16)

### Unit 1 Unit 2: QR Challenge

Question 14 (of 16)

### Unit 1 Unit 2: QR Challenge

Question 15 (of 16)

### Unit 1 Unit 2: QR Challenge

Question 16 (of 16)