chloetroulan_glucose3D.gif - Glucose

chloetroulan_ribose3D.gif - Ribose

chloetroulan_glycine_3D.gif - Glycine

chloetroulan_saturated3D.gif - Saturated

chloetroulan_mono-unsaturated3D.gif - Mono - unsaturated

chlotroulan_glutamine.gif - Glutamine


Chlotroulan Building Blocks of Life Worksheet
Chloetroulan_03.1 Chemical Elements and Water_essential Biology

Chloetroulan_03.2 Carbohydrates, Lipids and Proteins_essentialbiology
chloetroulan_page44and50_databasedquestions
lab on the release of carbon dioxide

data-based questions185-191

Bio - chloetroulan_05.1communitiesandecosystems_essentialworksheet

Bio - Questions on Pages 175-181


Food Energy Investigation Lab




Topic One - Statistical Analysis

Topic Two - Cells

2.1- Cell Theory
2.2- Prokaryotes
2.3- Eukaryotes

Lab on diffusion

Page 205-210 Questions
5.5 - Classification

2.4 - Membranes -

Pages 25-36 Questions -

Dichotomous Key -

5.4 Evolution -

Darwin and Evolution worksheet -



pulse_rate_before_and_after_a_period_of_exercise.PNGThe graph is complete, except that you should make sure to make sure that the gap does not occur between 6-8 minutes. That should be continuous.


Titiration_chart.PNG
Beer's_Law.PNGGraphs are complete



Assignment
Paste in your completed assignment if needed.
comments:
Teacher Comments
6 Research Questions
Temperature Probe

1. How does the buffing of a nail affect the temperature of the nail itself?
2. How does adding crystal light to a bottle of water affect the temperature of the bottle of water?

Blood Pressure Censor

1. How does jumping for 1 minute affect your blood pressure?
2. How does drinking a cup of coffee affect your blood pressure?

Bio chamber

1. How does holding your breath affect the amount of CO2 produced to exhale?
2. How does the release of carbon dioxide from a person outside to a person inside a locked room change?
Chad - Chloe's ideas are very nice! They are understandable clear. She shows a variety of interests in the following topics.

Nick-the-awesome: (so awesome that my name is in bold, Italics and its underlined)
The ideas are original but for the coffee blood pressure one I think you should also take the temperature of the coffee because the hotter the coffee the more the blood pressure may be affected. Also the second Bio chamber question, I think you should think more on how exactly you are going to test that and explain it better.

Practical 1 Write up: Testing acidity
Introduction:


There are people who claim that acidic substances are bad for you and others say that just because a substance is acidic it does not mean it is always harmful to your body. To prove this I tested a few substances used in nearly every home to cook with, I chose these to show that the acidity of substances does not mean it is always harmful.

Research Question:
Does the acidity of a substance mean that it is harmful to your body?

Hypothesis:

If I test the pH of lemon juice, vinegar, alcohol and water then the lemon juice and vinegar, which are common household cooking items, will be more acidic proving that if a substance is acidic it does not mean it harms your body.

Materials:

· Computer
· EasySense Logger
· A smart Q pH adapter and electrode
· 5 100 ml beakers
· Lemon Juice
· Vinegar
· Alcohol
· Water

Procedure:

1. Set up the programme logger lite if you have not already done so. Once it is loaded onto the computer open the programme and plug in the easysense logger into the USB port. Then plug the Smart Q pH adapter and electrode into the easysense logger.

2. Once all the apparatus is set up on the computer pour 25ml of each substance into its own 100 ml beaker making sure to label each beaker with the appropriate substance. This will make it easier when recording down your results.

3. Then take the pH electrode and place the lemon juice. Then click record to watch the pH change, once it has been in the substance for 10 seconds you may click stop and then click the button statistics. Record the mean pH of the substance.
4. Once you have done this you must ensure that you rinse off the pH electrode with tap water to enable it to return to a neutral pH.

5. Once you are positive the pH electrode is clean then you may repeat the steps 3 and 4 with the vinegar, alcohol and water. Record your results after each.

6. Finally from your results you can now draw a conclusion from what changes in the pH’s of each substance you see.

Results:



Substance
Lemon Juice
pH
2.340
Vinegar
2.624
Alcohol
4.830
Water
6.250





Conclusion:

A 7 on the pH scale is a neutral, when a substance has a lower pH this means that it is more acidic compared to one that has a higher pH causing it to be an alkaline. This shows that the lemon juice and vinegar were more acidic solutions compared to alcohol which was slightly acidic. Just because the water had a pH of 6.250 this does not mean that it is completely acidic, it is still neutral because any number between 6 and 8 is neutral on the pH scale. These results allow me to prove my hypothesis that just because a substance is more acidic it does not mean it is harmful to you because as I have proved in this experiment we use these substances all the time in our households and if they were harmful then it would be stated on the substance bottle to make sure not to digest. We can see from the lemon juice and vinegar that acidity has no relation to a substance being harmful because people use them in their homes all the time. Yes, the alcohol is not good for you to drink but that is one out of three substances I tested that can be harmful to your body.


Limitations:

There were limitations due to the fact that when the electrode was placed into each solution it was washed off but I could not be sure if it was completely clean and did not have any of the other substance left somewhere on it. By making sure it is fully clean this would then mean that I would be getting a definite more accurate reading of the pH. When I was pouring the substances into each of the 100ml beakers I could have measured them out to the same amount so that I would know that the electrode was not covered fully and getting a proper reading for one substance rather than all of them


Modifications:

This experiment was very easy and I would say quite successful although I would say that I could make some modifications if I was to do it again to make it more accurate and exact Also I would make sure that I have the exact same amount of the substance in the 100ml beakers and have a better variety of household substances. I would gather more substances from a household to test to help prove my hypothesis better as well as mixed some of the substances.

- The whole lab because my graph would not copy.

Practical 2 Write up: pH and Temperature
change in Coca Cola
Introduction
:
Alka Seltzer tablets are taken to neutralize an acid stomach. In this experiment, you will use cola to represent an acid stomach, and compare the effect of a solid tablet, with a crushed tablet.

Research Question:
How does the addition of Alka Seltzer affect the pH and Temperatureof an Acidic solution?

Prediction:
I predict that when you compare the effect of a solid tablet with a crushed tablet that the pH and temperature will both stay the same with either of the tablets.

Independent Variable:
Alka Seltzer

Dependent Variable:
pH and temperature

Factors to be controlled:
Make sure neither of the cokes have been shaken
Make sure that both the cokes are new and have not been opened
Make sure that each experiment is taken in the same place to avoid the temperature to be different in one coke than the other
Make sure that each coke has the same amount of liquid in it
Make sure that each coke is the same brand of coke (e.g Coca Cola)

Hypothesis:
If I compare the effect of both a solid tablet and a crushed tablet of Alka Seltzer dropped in coke then both the pH and the temperature will stay the same throughout both experiments from before the tablets were placed in the coke until after.

Materials:
- Two bottles of coke
- One solid Alka Seltzer tablet
- One crushed Alka Seltzer tablet
- 2 X 250ml beakers
- 1 X 400 ml beaker
- Water
- pH probe
- Temperature Probe
- Computer
- Timer

Procedure:

1. Firstly take 2 100ml beakers and fill them with 60ml of coke.
2. Then take both the temperature and the pH of the coke in each beaker before placing the Alka Seltzer tablets in them. Do this for 1 minute.
3. Next take the solid Alka Seltzer tablet as well as the crushed Alka Seltzer tablet and place them in the coke, as soon as they are placed in the coke make sure to start the timer.
4. Once the timer has reached 1 minute then take the temperature probes and place it in the beakers. Take down the results of the temperature probes after 1 minute.
5. Once you have taken the temperature probe out of the beakesr then place the pH probe into them. Take down the results of the pH probes after 1 minute.
7. Gather all the results and compare the differences to your hypothesis you wrote.

Safety Procedures:

1. Make sure to wear goggles because you do not know what chemical reactions may occur.
2. DO NOT taste or smell any of the materials used in this experiment before or after.
3. Make sure your working space around you is clear before you conduct this experiment.
4. If you have a problem be sure to ask your teacher for help instead of trying to deal with it on your own.
5. Try to prevent the beakers from being close to the edge of a table.

Results:
Jar 1 (Crushed Alka Seltzer Tablet) Jar 2 (Solid Alka Seltzer Tablet)



pH Before
2.18
2.27
pH After
6.23
6.09
Temperature Before
30.6
30.4
Temperature After
29.3
28.9



Conclusion

Overall, I noticed that there was not a significant difference between the temperature before and after the Alka Seltzer tablets were placed in the beakers of coke, the temperature in each decreased by no more than 2 degrees Celsius. The main difference I saw was the change in pH from before and after the Alka Seltzer tablets were placed in the beakers of coke. Jar 1 had a pH of 2.18 and jar 2 had a pH of 2.27, once the Alka Seltzer tablets were placed into the jars I noticed that jar 1 which had the crushed tablet placed into it foamed a lot more and almost overflowed out of the beaker whereas the beaker that contained the solid Alka Seltzer tablet stayed calm and did not even foam a little.


- The whole lab because the graph would not copy onto this page.

Complete command terms table
They are also on the main Command Terms page.


Example One – List
List all the organelles in a cell and explain the purpose of each.


Example Two - Distinguish
Distinguish the difference between mitosis and meiosis.


Example Three – Construct
Construct a diagram of the cell cycle, label and explain each stage.


Example Four - Explain
Explain the process of photosynthesis.