Sample essay topic, essay writing: Indicactor Lab - 429 words

What is in each test-tube? What proof do I have of this? Test-tube A: Test-tube A had water in it. I can base this on the fact that it was a neutral, reacting neither to red or blue litmus paper. Phenolphthalein also did not react to this substance. The pH value was 7, neutral, also adding to the proof that this substance was water, because water is neutral. The substance was clear and odorless, and all of these reactions combined led me to my conclusion of substance A being water. Test-tube B: Test-tube B had spoiled milk in it. The substance reacted to blue litmus paper, and red litmus paper underwent no change. Phenolphthalein did not change, and the pH value was 6, a weak acid.

The appearance of this substance was a thick, white liquid that had a horrible odor. These observations led me to my conclusion that substance B is spoiled milk. Test-tube C: Test-tube C had ammonia in it. The substance reacted to red litmus paper, and it had no effect on blue litmus paper. Phenolphthalein turned a hot pink color very quickly, and the pH value was about 11.5. The substance was clear and had a strong odor to it. These results led me to my conclusion that substance C is ammonia. Test-tube D: Test-tube D contained lemonade. The substance reacted to blue litmus paper, and red litmus underwent no changes. It had no effect on Phenolphthalein, and its pH value was 3, a strong acid. Knowing that lemons are very acidic, and that the substance was yellow and sweet smelling, I concluded that substance D was lemonade. Test-tube E: I could not come to a conclusion on what substance E was

It reacted weakly to blue litmus paper, and it did not change red litmus. It had no effect on Phenolphthalein, but its pH value tested as 7. This cannot be correct however, because all acids have a pH value less than 7. The appearance and smell were not of any help, because it was a clear substance with a slight odor I couldn't key in on. So my conclusion is that this substance was an extremely weak acid of some sort. Test-tube F: Test-tube F contained sodium hydroxide.

The substance had a very strong reaction to red litmus and no reaction to blue litmus paper. It had a very strong effect on Phenolphthalein, and its pH value tested as 12+, a very strong base. The substance also had a bitter odor. These results led to my conclusion that substance F was sodium hydroxide, one of the strongest bases that exist.

Research paper and essay writing, free essay topics, sample works Indicactor Lab

• Alex Jones Short essay

I think that the sludge test is a good way to assess my progress in science. I first filtered the sludge that was given to us in hot water. That separated the solids from the liquids. Then I filtered all the sludge in cold water. I boiled a portion of the sludge that made it

• Alex Jones Short essay

I think that the sludge test is a good way to assess my progress in science. I first filtered the sludge that was given to us in hot water. That separated the solids from the liquids. Then I filtered all the sludge in cold water. I boiled a portion of the sludge that made it

• Fermentation Lab

Hypothesis: If to separate tubes of 20% glucose solution with 1 mil of yeast is added to battery jars filled with 20 and 38 c water then the warmer one will cause the yeast to ferment at a quicker rate. Materials: -2 test tubes (100 mm. Long x 11 mm. I. D.) -2 ones-hole stoppers (size 00 w/3

• Beet Lab

Sample essay topic, essay writing: Beet Lab - 787 words MATERIAL AND METHODSStability of cell membrane using pHFor the lab experiment for testing the stability of beet cell membranes using pH, many materials were used as follows. Obtaining a beet we punch out cores, using a cork borer. After washing the cores we put each one

• Biology

Sample essay topic, essay writing: Biology - 628 words Introduction:Respiration commonly known as the inhalation and exhaling or breathing has a more little known definition. This is the definition that involves the cellular level of eukaryotic cells. Cellular respiration may best be described by the following equation: C6h1206+602-6CO2+6H20+36ATP. ATP that is the energy needed for a