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
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. One of the useful properties of polymers is that they are unreactive, so they aresuitable for storing food and chemicals safely. Unfortunately, this property makes it difficult to dispose of polymers. | 2. Most polymers, including poly(ethene) and poly(propene) are not biodegradable. This means that micro-organisms cannot break them down, so they may last for many years in rubbish dumps | 3. Polymers can be burnt or incinerated. They release a lot of heat energy when they burn and this can be used to heat homes or to generate electricity. | 4. There are problems with incineration. Carbon dioxide is produced, which adds to global warming. | 5. Toxic gases are produced unless the polymers are incinerated at high temperatures. | 6. The different polymers must be separated from each other first, and this can be difficult and expensive to do. | 7. Many polymers can be recycled. This reduces the disposal problems and the amount of crude oil used. | 8. When glass, paper and cans are recycled, they become similar products which can be used and recycled over and over again. With plastics recycling, however, there is usually only a single re-use. Most bottles and jugs don't become food and beverage containers again. For example, pop bottles might become carpet or stuffing for sleeping bags. Milk jugs are often made into plastic lumber, recycling bins, and toys. | 9. A recent development has been the bottles-to-bottles recycling of "regenerated" pop bottles. Though it is technologically possible to make a 100% recycled bottle, there are serious economic questions. Also, some critics claim that the environmental impact of the regeneration process is quite high in terms of energy use and hazardous by-products. | 10. Polyvinyl chloride (PVC) bottles are hard to tell apart from PET bottles, but one stray PVC bottle in a melt of 10,000 PET bottles can ruin the entire batch | 11. It's understandable why purchasers of recycled plastics want to make sure that the plastic is sorted properly. Equipment to sort plastics is being developed, but currently most recyclers are still sorting plastics by hand. That's expensive and time consuming. | 12. PETE Polyethylene Terephthalate (PET) - Soda & water containers, some waterproof packaging. Recycling PET is similar to the polyethylenes (PE). Bottles may be color sorted and are ground up and washed. Unlike polyethylene, PET sinks in the wash water while the plastic caps and labels are floated off. The clean flake is dried and often repelletized. Recycled PET has many uses and well established market for this useful resin. By far, the largest usage is in textiles. Carpet companies can often use 100% recycled resin to manufacture polyesther carpets in a variety of colors and textures. PET is also spun like cotton candy to makr fiber filling for pillows, quilts and jackets. PET can also be rolled ito clear sheets or ribbon for VCR and audio cassettes. In addition a substantial quantity goes back into the bottle market. | 13. HDPE High-Density Polyethylene - Milk, detergent & oil bottles, Toys and plastic bags. HDPE is called natural since that is it's natural color, and it is the most valuable because it can be made into any color when it is recycled. Other products are often packed in brightly colored bottles whiched are mixed together at recycling plants into mixed color or rainbow bales. Most of this material is later dyed black after it is processed. Some end uses for recycled HDPE are plastic pipes,lumber, flower pots, trash cans, or formed back into non food application bottles. | 14. V Vinyl/Polyvinyl Chloride (PVC) - Food wrap, vegetable oil bottles, blister packages. | 15. LDPE Low-Density Polyethylene - Many plastic bags. Shrink wrap, garment bags. It ic chemically similar to HDPE but it is less dense and more flexible. Most polyethylene film is made from LDPE which you often see as plastic bags and grocery sacks. This scrap may be clear or pigmented and it is hand sorted and baled at recycling processing plants. | 16. Recycling LDPE is verry similar to HDPE except special grinders are used to handle the thin films. The films are often washed and repelletized or used directly to make new products. Some end uses for recycled LDPE are plastic trash bags and grocery sacks, plastic tubing, agricultural film, and plastic lumber. | 17. PP Polypropylene - Refrigerated containers, some bags, most bottle tops, some carpets, some food wrap. | 18. PS Polystyrene - Throwaway utensils, meat packing, protective packing. | 19. These symbols are meant to indicate the type of plastic, not its recyclability. Types 1 and 2 are commonly recycled. Type 4 is less commonly recycled. The other types are generally not recycled, except perhaps in small test programs |
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