Year 8 Science Term 1 Assessment 2 Rubric and Practice paper. Title of the experiment: Comparing Energy Content of Different Snacks

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1 Year 8 Science Term 1 Assessment 2 Rubric and Practice paper Unit 1: Taking care of ourselves and others AOI: Health and Social Education Unit Question: How does lifestyle relate to your physical well-being and the well-being of others? Significant Concept: Taking care of yourself is taking care of your next generation. Assessment criteria: B Scientific Inquiry, C Processing Data and Attitudes in Science (It will be determined as the effort in the report card, excellent, good, satisfactory or unsatisfactory) Topic: Food and Energy Title of the experiment: Comparing Energy Content of Different Snacks Task: l You will be given three types of snacks, and you need to conduct an experiment to compare their energy content. You will also need to write a full lab report to show your findings. l You will be given two double periods to do the experiment and write the lab report. A lab report template similar to the one you used for practice will be provided for you. l You will be working in groups of two persons, which will be announced on the first day of the assessment. You are just performing the experiment together, and you are not allowed to share your lab. Report to your partner. You should take your own responsibility to record the data. l You will need to bring a regular calculator and stationery for drawing graphs to the assessment. You will not be allowed to use phones, music players or computers with calculator function. l You need to show all the working steps involved in calculation in order to achieve a higher grade. Schedule: Receive the Rubrics Practice Lab Practical Receive feedback of the Practice paper (Depends on the class s schedule) Assessment Day 1: Do the Lab. Report (No apparatus/ materials will be provided) Assessment Day 2: Do the experiment and collect data (Comparing Energy Content of Different snacks) Assessment Day 3: Finish the Lab. Report 1

2 Grading Criteria Criteria B Scientifi c Enquiry I tried to write an aim to describe the I wrote an aim that describes the I wrote an aim that describes the experiment clearly. I tried to write a hypothesis. I wrote a hypothesis. I wrote a relevant hypothesis. I wrote an aim that describes the experiment clearly and scientifically. I wrote a relevant hypothesis with scientific reasoning. C Processi ng Data I tried to list the material. I tried to write a method and I tried to draw a diagram. I tried to evaluate the method and I tried to suggest improvements to the I tried to record some data. I listed the material. I wrote a method and I drew a diagram. I evaluated the method and how it might have affected my results. Moreover, I suggested improvements to the I wrote a title for the tables and I recorded some data. I listed some materials, including the amount I need to use. I wrote a detailed method in numbered list and I drew a clear diagram. I evaluated the method by describing what steps went wrong and how it might have affected my results. Moreover, I suggested improvements to the I wrote a title for the tables and I recorded enough data with the correct units. I listed all the material, including the amount I need to use in bullet point. I wrote a very detailed method in numbered list and I drew a clear labeled sectional diagram. I evaluated the method by describing what steps went wrong and how it might have affected my results scientifically. Moreover, I suggested realistic improvements to the I wrote a clear title for the tables and I recorded enough data with the correct units. I tried to do appropriate calculation with my data. I did appropriate calculation with my data. I did appropriate calculation with my data correctly, using the correct units. I did appropriate calculation and show all the working steps with my data correctly, using the correct units. 2

3 C Processi ng Data I tried to present my results as a graph. I presented my results as a mostly correct graph. I presented my results as a graph, with correct title, axis, and labels. I presented my results as a very good graph, with correct title, axis, and labels. I tried to form a conclusion with my results. I tried to discuss my results. I formed a conclusion with my results. I discussed my results. I referred to my hypothesis and I formed a conclusion with my results and graph. I discussed my results and explained it with scientific reasoning. I referred to my hypothesis and I formed a clear conclusion with my results and graph. I discussed my results and explained it with correct scientific reasoning. Attitudes towards Science Unsatisfactory Effort Satisfactory Effort Good Effort Excellent Effort Teacher intervention needed often Members work well together most to help group cooperate. of the time. Members work well together some of the time. Some teacher intervention needed. All members work well together all of the time; assist others when needed. My desk/side-bench is messy and dirty. My desk/side-bench is clean. My desk/side-bench is clean with everything organized. My desk/side-bench is clean and tidy with everything organized. I handled apparatus carelessly. I did not clean the apparatus after I did not work safely or I played with other students during the I handled some apparatus carefully. I cleaned some apparatus after My experiment was safe with some reminders. I handled all apparatus carefully with teacher s reminders. I cleaned and returned all the apparatus after experiment with reminders. My experiment was safe and I conducted the experiment seriously with some reminders. I handled all apparatus carefully without any reminders. I cleaned and returned all the apparatus after experiment without any reminders. My experiment was very safe and I conducted the experiment seriously without any reminders. 3

4 Name: Homeroom: Date: Title: Practice: Finding the Energy Content of a Snack Aim: (Crit. B - I wrote an aim that describes the experiment clearly and scientifically.) Hypothesis: (Crit. B - I wrote a relevant hypothesis with scientific reasoning.) Material: (Crit. B - I listed all the material, including the amount I need to use.) 4

5 Method: (Crit. B - I wrote a very detailed method in numbered list.) Diagram: (Crit. B - I drew a clear labeled diagram.) 5

6 Data Collection and Calculation: (Crit. C - I wrote a clear title for the tables and I recorded enough data with the correct units.) (Crit. C - I did appropriate calculation and show all the working steps with my data correctly, using the correct units.) Note: You should do a minimum of three repeats. You could do more if you have enough time. Table 1 (Title) Mass Starting Temperature Final Temperature Temperature Rise (Crit. C - I did appropriate calculation and show all the working steps with my data correctly, using the correct units.) Energy (J) = 4.2( J/cm 3 / o C ) x Volume of water (cm 3 ) x Temperature rise of water ( o C) Energy content = Energy given out by the food (J) (J/g) Weight of the food (g) Energy content = Energy content (J/g) (kj/g) 1000 Table 2 (Title) Energy Energy Content Energy Content Average 6

7 Graph: (Crit. C - I presented my results as a very good graph, with correct title, axis, and labels.) *Practice on P.8-11 Conclusion: (Crit. C - I referred to my hypothesis and I formed a clear conclusion with my results and graph.) Discussion: (Crit. C - I discussed my results and explained it with correct scientific reasoning.) Evaluation: (Crit. B - I evaluated the method by describing what steps went wrong and how it might have affected my results scientifically. Moreover, I suggested realistic improvements to the ) What are the weaknesses of my method?/ What s wrong with the steps? How might it affect my results? How would it be improved? 7

8 Calculating energy content in food You can measure the amount of energy in some food by burning it. As the food burns, the energy stored in the nutrients is turned into heat in the flame. You can use the flame to heat up some water, which is 20cm 3 in your The hotter the water gets, the more energy is in the food. 1. Calculating energy: 4.2 Joules of heat energy are needed to raise 1g or 1cm 3 of water by 1 o C. In other words, 4.2 Joules per cm 3 per o C, or 4.2 J/cm 3 / o C Energy (J) = 4.2( J/cm 3 / o C) x Volume of water (cm 3 ) x Temperature rise of water ( o C) 2. Calculating energy content per gram of food (Joules/gram): Energy content = (J/g) Energy given out by the food (J) Weight of the food (g) 3. Changing the units from joules to kilojoules: Energy content = Energy content (J/g) (kj/g) 1000 Food A Trial 1 is done for you as an example 8

9 Food Trial Weight (g) Starting Temp. ( o C) Finishing Temp. ( o C) A g 25 o C 63 o C Temp. Change ( o C) = 38 o C Energy (J) 4.2 x 20 x 38 = 3192 J Energy content (J/g) 3192/0.46 = 6939 J/g Energy content (kj/g) 6939/1000 = kj/g g 23 o C 87 o C g 36 o C 75 o C g 22 o C 72 o C Average B Average C Average 9

10 Average energy content (kj/g) of food A, B, and C Energy Content (kj/g) A B C FOOD 10