Effect of temperature on carbon dioxide production
C – We will Change the temperature of the solution in the range of 20-30ºC. We do not want the temperature too high or the enzymes in the yeast will denature
O – Yeast (10 grams) – whether it will anaerobically respire. The same species of yeast will be needed, same mass of yeast
R – We will repeat each temperature the yeast is in the water bath 3 times to make the test reliable
M – The volume of carbon dioxide released by the yeast respiring anaerobically after 20 minutes. This will be measured by the diameter of a balloon (Gas inside the balloon is CO2). Measured with ruler in cm^3 . May test with lime water (If limewater goes cloudy, it shows presence of CO2)s
S – pH, concentration of yeast, concentration of sugar, equipment
Effect of sugar concentration on carbon dioxide production
C – The mass of sugar in grams (A range of 10-50 grams of sugar) because yeast need glucose to respire.
O – 10 grams of yeast which will need to be the same species as different species of yeast respires differently
R – at least 5 times for result reliability
M – This will be measured by the diameter of a balloon (Gas inside the balloon is CO2) Measured with ruler in cm^3 .May test with lime water (If limewater goes cloudy, it shows presence of CO2)
S – pH, temperature and type of yeast, temperature, species of yeast
Effect of pH on carbon dioxide production
C – The pH of the yeast solution – you can use buffers to change and maintain the pH of the solution (pH 5, 7, 9)
O – 10 grams of yeast
R – at least 5 times to ensure reliability
M – The volume of carbon dioxide released by the yeast respiring anaerobically after 20 minutes. This will be measured by the diameter of a balloon (Gas inside the balloon is CO2). Measured with ruler in cm^3. May test with lime water (If limewater goes cloudy, it shows presence of CO2)
S – The level of sugar, temperature, species of yeast
Element – elements that consist one type of atom only, e.g. Oxygen, copper and aluminium
Compound – substance with two or more different elements which are bonded together. Once formed, it is very difficult to separate molecules as they have been chemically bonded. Properties of compound are often not the properties of the original elements, as hydrogen and oxygen exist as gasses at room temperature, but chemically bonded they are H20, also known as water at room temperature
Mixtures – group of elements and compounds mixed together. Not necessarily chemically bonded
I know studying can be boring.
But if you want those A*s, you gotta spend the mountain of hours buried behind books.
But who said that it couldn’t be a little bit enjoyable?
Hopefully this motivates you to buy a new moleskine notebook and a whole set of pens for revision purposes, and then, you’ll be on the path to better grades!
This blog post will be updated as often as possible, or whenever I find a new revision website I think is really helpful.
^ These notes make you want to study.
Links to helpful revision websites:
https://quizlet.com/ ← Follow me @ Padfootxx
http://study.com/academy/subj/science.html ← American Syllabus
Links to helpful information websites
http://hannahhelpbiology.blogspot.my/ <– Quick and easy, has the whole spec
http://milliemakesphysicseasy.blogspot.my/ <– More detailed, however incomplete spec
http://askmichellechemistry.blogspot.my/ <– Incredibly detailed explanations, however incomplete spec
Good youtubers for studying when you don’t feel like it:
- https://www.youtube.com/channel/UCQQ4q-5Z2IsLq3yPLXITeWg ← Very good history help channel
- https://www.youtube.com/user/hughesDV/videos ← history