Investigating Enzyme Activity :: Papers

Investigating Enzyme Activity PLANNING AIM === The aim of this experiment is to see how changing the concentration of Hydrogen Peroxide (H2O2) affects the rate of reaction of the enzyme Catalase. The reaction I am looking at is the breakdown of Hydrogen Peroxide into water and oxygen by the enzyme Catalase. The equation for this reaction is: 2H2O2 Ã   2H2O + O2 FACTORS ------- In this experiment I could change the following factors: Concentration of the Hydrogen Peroxide or Catalase, the time, the temperature and the Ph of the solutions. SCIENTIFIC KNOWLEDGE (See appendix 1) PREDICTION ---------- My prediction is that the higher the concentration of Hydrogen Peroxide, the greater the amount of oxygen given off will be within a period of time. The lower the concentration of Hydrogen Peroxide the amount of oxygen given off will be less than if it was at a higher concentration. I think this because there are more particles in a substance to collide and react at a higher concentration. VARIABLES I am not going to change anything other than the concentration of the Hydrogen Peroxide. The concentration of the Catalase enzyme, the temperature of the laboratory and the Ph of the solutions will remain constant. EQUIPMENT Hydrogen Peroxide (concentration - 0.5 1.0%, 1.5%, 2.0%, 2.5% and 3.0%) Safety Catalase Water trough, Burette, Stop clock, Delivery tube, Clamp stand, Conical flask, Syringe, Pipette Glasses/goggles, PROCEDURE 1. I will take the equipment drawn and set it up as shown. *(appendix 2) 2. I will fill the burette and water trough with water. 3. Using a measuring cylinder, I will put 10ml of Hydrogen Peroxide in the conical flask connected to the delivery tube. 4. Trying to prevent water from escaping, I shall turn the burette upside down and clamp it to the stand with the bottom of the burette in the water trough and feed the delivery tube through the burette.

Kite Runner Essay

In The Kite Runner, there are many examples of cruelty towards either the characters or their race as a whole. Two examples of cruelty include when the Afghanistan soldiers pick on Hassan, and one of them states that he has had sex with Hassans’ mother, and the other example is Amir setting up Hassan for stealing, in order to get rid of him. In the first example, the soldiers refer to Hassan as â€Å"You! The Hazara! † The lack of a noun here, i. e. Hassan’s name, demonstrates that Hazaras are treated as second class citizens, and aren’t deserving of being called by name. This has the effect of making Hassan appear to be an outcast, and it makes the reader feel sympathy for him, at being treated so harshly. The use of the sexually suggestive hand gesture by the soldier, when he’s making fun of Hassan because he had sex with his mother, again backs up the idea of Hazara’s being second class citizens. The metaphor â€Å"what a tight little sugary cunt she had† is used in a derogatory sense to further emphasise the contempt which Hazara’s had to endure back in 1970 Afghanistan. This achieves the effect of making the reader feel indignant at how Hassan is being treated, and that it is completely unjustified and is basically an advanced form of bullying. When the soldiers address Hassan, one of them says â€Å"Look at me when I’m talking to you! †. This is an imperative sentence, as the soldier is ordering Hassan to look at him, instead of requesting that he does so. The soldier is being demanding due to the fact that he believes his race is the superior race in comparison to the Hazaras, and that Hazaras always have to obey orders given to them, without question. In the second example of cruelty, Amir wonders to himself â€Å"how and when I’d become capable of causing this type of pain† As this is told via a first person perspective, it really helps the reader to understand what Amir is feeling, which emphasises the sense of cruelty, as the character who has committed the cruelty himself realises what he has done. Also, as he is speaking the past tense, with the use of the word â€Å"When†, it suggests that he wants to know what changed him to be so cruel. The use of the simple sentence â€Å"That was when I understood the depth of the pain I had caused†, is a great way of displaying the cruelty which Amir has shown in setting Hassan up for stealing his watch and money, and the sentence after it â€Å"not even Ali’s paralysed face could mask his sorrow† ,also helps to show this. These two simple sentences suggest that Amir realises that there is no justifying what he has done, that all he feels is relentless guilt, and that there is no other way of evaluating his decision. In conclusion, these two examples are strong demonstrations of the cruelty displayed in the Kite Runner, as they cover racism, which is shown in the first example, and in the second example, the words used e. g. â€Å" depth of the pain I had caused† clearly display Amir’s feelings of cruelty at what he himself has done.

Rape - a Love Story - 617 Words

The book (that’s written by Joyce Carol Oates in mid-2000 and republished in 2005) kicks off by introducing the main characters Betty and Teena Mcguire. Teena was a vibrant woman in her early 30’s until a horrible incident struck her that would affect not only her family but the entire community. After being brutally raped by a gang of criminal teenagers who were high on drugs her daughter Betty was left with huge responsibilities, from taking care of her wounded mother to struggling for justice against the people who did her mother wrong. The case is led by a policeman that’s also a former military soldier named John Droomor; he was the man that found Teena lying naked and torn on the floor of the boathouse. The book consists of†¦show more content†¦Teena never fully recovered in the events of the book, she became a different kind of person never to be the same again. Teena’s daughter Betty also changed that night. She became tentative and didnà ¢â‚¬â„¢t want anybody to hurt her mother. She felt lost and confused by the court system and why her mother didn’t want to go to court. She had to adapt so that she could take care of her mother and make her feel a bit better every day. The character that changes the most during the book is Droomor. He feels a connection between him and Teena, and he also has a daughter of his own. When Droomor sees Teena lying in the boathouse he feels that he needs to protect her and get the people responsible. During the book Droomor changes more and more radically until he finally snaps and kills the suspects that raped Teena. He then hides the evidence so that nobody finds out that he was linked. Droomor then becomes a detective at the end. The book was interesting to me in a way because of the mature language and the gruesome way to describe the incidents and took place in the book, which was a first for me. 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