Y9 EXAM. Mostly on Science techniques!

Transcription

1 Y9 EXAM Mostly on Science techniques!

2 SCIENTIFIC PROCESS Put all these parts of an experimental method into the correct order! METHOD CONCLUSION APPARATUS RESULTS TABLE GRAPH RISK ASSESSMENT HYPOTHESIS OBSERVATION

3 SCIENTIFIC PROCESS 1 OBSERVATION 2 HYPOTHESIS 3 APPARATUS 4 METHOD 5 RISK ASSESSMENT 6 RESULTS TABLE 7 GRAPH 8 CONCLUSION

4 COMPARING HOW DIFFERENT SUBSTANCES DISSOLVE! PUT THESE PARTS OF A METHOD IN ORDER A Record your results in a table. B Add sugar to one beaker, salt to another and sand into the final beaker. C Weight out 100g of sand, sugar and salt. D Time how long each substance takes to dissolve. E Quickly fill 3 beakers with 200ml of water at 60 o C.

5 COMPARING HOW DIFFERENT SUBSTANCES DISSOLVE! PUT THESE PARTS OF A METHOD IN ORDER C Weight out 100g of sand, sugar and salt. E Quickly fill 3 beakers with 200ml of water at 60 o C. B Add sugar to one beaker, salt to another and sand into the final beaker. D Time how long each substance takes to dissolve. A Record your results in a table.

6 VARIABLES What is the one thing the students are changing? Name 5 things they have to keep the same? What observations are they recording?

7 ACCURACY What did the students use to measure the 60ml of water? How did the student know the water was at 60 o C? Where did the student get a reliable source of water at 60 o C? How precise do you think their results need to be? E.g.?

8 ACCURACY One student decided to measure their substances using a tea spoon. Why was this not an accurate method? How might this affect their results?

9 COPY AND COMPLETE RESULTS SUBSTANCE TIME TO DISSOLVE (s) OBSERVATIONS SAND -? SUGAR 122 Clear but sticky SALT? Clear Salt dissolved in 50% of the time taken by sugar. How long did the salt take to divide? What observation did the student write about the sand?

10 DRAW A ROUGH BAR CHART Draw a very rough bar chart of the result the student gathered. Which axis will you use for each set of data? What titles will each axis need? Are there any units? Do bar touch on a bar chart?

11 WASHING POWDERS Jim s Mum buys a new washing machine and wants to see which washing powder will work best. How many different washing powders should she try? How many times should she test each powder? Describe how she will test how good the powders are? (How will she know doe sure that one powder is better than another?)

12 RECOMMENDED DAILY INTAKE OF NUTRIENTS FOR EACH GROUP OF PEOPLE Who needs the most protein? Which group needs 100g of fat? Which groups need the same amount of iron? Do pregnant women need more nutrients than any other group? Why do year old males need more energy than anyone else? Why does the need for Calcium decline as we get older?

13 OBSERVING BIRDS A pair of Ospreys return to the same tree each year to hatch and rear their young. Why might the Ospreys return to the same place? Ospreys, on average, produce 1.8 live young each year. The Ospreys have produced 3 chicks every year for the last three years. Suggest one reason why the Ospreys are so successful in the tree?

14 TWO SCIENTISTS SAID The Ospreys might be more evolved than other birds, so are better at surviving. There might be more food around the tree for these birds to eat. As the garden has a high wall, there might be less predators that can get at the chick. WHICH THEORY IS MOST LIKELY. GIVE TWO REASON WHY YOU THINK SO.

15 MIXING FUELS Timmy, a Hollywood special effects wiz, likes to mix 500ml of Ethane gas with 4500ml of Propylene gas. He find that this mix burn fiercely and with a bright red flame. What percentage of the final gas mix is Ethane? If he had 2500ml of the gas mix, how much would be Ethane? Ethane costs 12p for ml. How much would Timmy need to spend to make up 10,000ml of the gas mix?

16 CHEMICALS Iron rusts when left out in the open. What gas causes Iron to rust? What compound is formed when Iron rusts? 100g of iron turns completely to rust. Would the rust weigh more or less than 100g? Explain your answer!

17 Describe how the form we buy music in has changed since What format has sold more than any other? Why should companies not invest in the production of CDs? Why were there no digital sales before 2003?