Working out energy content in fuels

During the last couple of weeks we have been doing a lot of practical activities based around the energy content of fuels. It is a simple process involving heating water with a flame produced by either burning wax, natural gas or ethanol.

Scientists have found that it takes 4.2 Joules of energy to heat 1ml of water by 1 degree C. So as long as we know how many mls of water we are heating and how long it takes and by how much the temperature increases we can calculate the amount of energy produced per unit of time. If we know also how much fuel was consumed (burnt) for example by weighing the fuel before and after heating the water we can calculate how much energy is produced per gram of fuel. This can be used to compare the energy content of our fuels.

Energy content in ethanol

Carbon compounds as fuels

Right now you should  be completing the two research tasks as you prepare for the internal assessment. If you have any questions about the assessment please make sure you ask your teachers for help.

Calculating the energy from the sun

The sun's energy on earth - Wonders of the Solar System - BBC - YouTube: ""

'via Blog this'

Year 11 Study class

Dear Students

I hope your study is going well. On Friday I will be available to run a study class during spell four and five in room B12.

Any year 11 Science students are welcome. it would be best if you came with questions that you would like answered or parts of the course you would like to go over again.

Regards

Mr Edwards

NZQA Parallel Papers - Use as a practice run for revision

Tips for revision with these papers

1. Look at questions and answers.
2. Write out answers to questions. Read around them.
3. Add memory tricks to your answers using a different coloured pen.
4. The next day - Sit the exam without looking at the answers.
5. Compare your answers to the ideal answers. Add memory tricks to any question that was not answered perfectly. Read around questions and answers.
6. Two days later - Sit the exam again and repeat 5.
7. One day before the exam - Sit the exam again and repeat 5.

Acids and Bases test
Genetics test
Mechanics test

Mechanics Revision Sheets (Science Point)

Click on the following link to access the Mechanics worksheet answers for Science Point

REVISION WORKSHEET pack answers

Your Science teacher has provided you with a large number of revision worksheets to guide you through skills required in upcoming Science exam. Click on this link to access the file with answers.
Revision classes take place this afternoon after school and Thursday after school. We look forward to seeing you with questions! Miss Meehan

Genetics
1 - DNA
2 - Chromosomes
3 - DNA, Alleles, Genes, Chromosomes
4 - Meiosis
5 - Inheritance

Acids/Bases
1 - Atomic structure and Ions
2 - Ionic bonding
3 - Rates of reaction
4 - Acids/Bases and indicators
5 - Acids

Mechanics
1 - Speed and Acceleration
2- Distance/time graphs
3 - Speed/time graphs
4 - Forces
5 - Forces2