Miss Campbell’s Science Blog

Here is the powerpoint that we used this week in lesson as guidance for your case study. 

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Year 10 GCSE Exams

Unit 4 Exam - Ideas in Context - Exam is Thursday June 7, 2007. For this exam you need to have covered the material given to you as pre-release material from the exam board.  You should have underlined key words, identified information that you need to find out more about and be familiar with the content of the articles.   

Unit 2 Test is the Monday June 18, 2007.  This exam will cover units B2, P2, and C2. 

Unit 3 Test is Wednesday June 20, 2007.  This exam will cover unit B3, P3, and C3. 

To revise for these units you should be looking at the keywords from the topics, using target sheets that you have been given and answering questions. 

The Science department offers revision guides for £2.75.  You can get yours from your science teacher.  Just ask!

There is also revision sessions Wednesday after school.

You are currently working on Unit P2 – Radiation and Life.  In this unit you are learning about the risks and benefits of associated with a range of radiations known as the electromagnetic radiation spectrum. 

To complete the write up on the two practicals we have done.  You need to have a risk assessment, background information on water hardness, and method for both water hardness and concentration of the commercial descaler.   Due Thursday 15 March 2007

In our last lesson we looked at writing a conclusion for our experiment on Vitamin C content in drinks.  To do this experiment you used DCPIP test solution.  You added drops of the drink to the DCPIP solution and recorded how many drops it took to change the DCPIP from its dark blue colour.  The more vitamin C a drink contained the less drops it took to change the colour of the DCPIP solution.  You tested a selection of drinks and should have a table like the one below in your book.

We found that the freshly squeezed juices contained more vitamin C.  We then extended our conclusions and discussed how packaging and storing food decreases the amount of vitamin C in drinks. 

To continue on with our Unit on Fit and Healthy we then looked at the effects of Drinking Alcohol on our bodies with a quick worksheet.

We are learning about photosynthesis which is a process that enables plants to make their own energy.  In photosynthesis plants take in carbon dioxide from the atmosphere and water from the soil and they use energy from the sun to make glucose and oxygen.  The glucose is stored in the plant and the oxygen is released to the atmosphere.   

We can write photosynthesis as a word equation as follows: 

Carbon dioxide + Water + (energy from the sun) ——->        Glucose + Oxygen 

We can also write this as a balanced chemical equation as follows: 

   6CO₂        +  6H₂O +  (energy from the sun)   ——–>     C₆H₁₂O₆    + 6O₂   

In our last lesson we did an experiment to test whether or not the process of photosynthesis requires sunlight.  You were given leaves that had a strip on it that was blacked out by black paper.  This was set up prior to your lesson to block that section of the leaf from getting any sunlight.   You boiled the leaf in water, and then warmed it in ethanol to remove the green colouring.  The leaf was then laid on a white tile and you applied iodine to it.  Where the iodine turned black there is starch.  The presence of starch indicates that here the leaf was doing photosynthesis.  Where there is no starch (no colour change of the iodine) the leaf was not able to do photosynthesis.  The sections of the leaves that were covered in black paper had no colour change.  See the pictures below.

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The science department is currently offering KS3 revision sessions for the SATS exams Monday’s after school from 3:15.  There are also sessions being ran Thursdays and Fridays at lunch.  Please see Miss Campbell for more details.

Today you worked on finding the concentration of a commercial descaler by titrating it with 1M Sodium Hydroxide. 

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