The Necklace

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5.6 describe a simple experiment to investigate carbon dioxide production by yeast, in different conditions

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

1.6 understand the differences between elements, compounds and mixtures

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

Your Weekly Motivation To Study

Hey!

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.

Happy studying!

Studyblrs:

http://theorganisedstudent.tumblr.com/

http://amfitrite.tumblr.com/

http://studyblresource.tumblr.com/
tumblr_nmb9s3Xp6J1uqg4zmo1_500.jpg

^ These notes make you want to study.

Links to helpful revision websites:

https://eduvee.com/

https://www.goconqr.com/en-US

https://getrevising.co.uk/

https://quizlet.com/ ← Follow me @ Padfootxx

https://realtimeboard.com/

http://www.s-cool.co.uk/gcse

http://study.com/academy/subj/science.html ← American Syllabus

 

Links to helpful information websites

http://www.synonyms-antonyms.com/synonyms-for-said.html

http://www.shmoop.com/literature-glossary/

http://www.hoddereducation.co.uk/geographyreviewextras

Science Blogs

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: