Learning

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Freezing Point Depression Lab

1) Any changes to the "lab"?

Throughout the time period of ten minutes, the temperature of the ice began to decrease because of its reaction with the rock salt. Gradually, the liquid mixture solidified as it was being kneaded for the duration of ten minutes. However, physically, the solidification instance would not last very long because it was no longer near the ice source—it was beginning to melt.

2) How did it (your ice cream) turn out?

The ice cream, taste wise, had too much vanilla extract in it and the consistency/texture of the ice cream was semi-thick and smooth.

3) Why do you think it turned out the way it did?

We believed it turned out this way because it needed the ice source to stay solidified and we may have had to kneaded it longer to make it thicker.

4) Any potential sources of error? Minimum: one.

Some potential sources of error would have been not kneading the mixture enough and/or correctly.

Brought to you by Michelle Nguyen and Nasya Matos Co.

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I am thankful for being alive. The reason I am living on this planet is because of the hormones within my two parents. They both have glands that produce these hormones which are chemical messengers. Because of them, they tell the cells what to do. Specifically, the ovary and testis were the cause of my birth. Hormones were emitted from them and eventually when the sperm entered an egg it undergoes a chemical reaction which over time produced me.

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Blog #7: What's the Count? Lab 

1) What do you think is the purpose of the lab?

I believe the purpose of the lab was to show us that although atoms are so small that they appear to be invisible, chemists can still count them by using an imperfect method: finding out the total mass of a molecule then dividing it up to find the mass of a single atom.

2) How did your samples (for number of dried beans and rice grains) compare with 100?

Our samples for the number of dried beans and rice grains were not exactly at 100, but were however still close to that amount.

How did the samples compare to your classmates?

Our samples were similar to our classmates, but were not exactly alike since beans and rice all come in different sizes.

I need 1,000 dried beans and do not have the time (or energy) to count it out. What should I do? (include pictures)

Find the weight of a dried bean then multiply that by 1,000. The calculation will be an approximate estimation of 1,000 beans since no bean is perfectly alike the other.

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Blog #3: Intro to Scientific Method Lab

1) What are the five signs of a chemical reaction occurring?

Chemical reactions may involve one or more of the following:

the release or absorption of heat or other energy

production of gas

production of odor

production of color

production of sound

2) Provide photographic evidence.

Provided above.

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Blog #2: Diver’s Lab

1) Why did the dropper sink as you squeezed the bottle?

When I squeezed the dropper, it sank because the pressure had increased the density within it as the water entered through the dropper.

2) Provide evidence to support your answer.

The liquid had no where else to go since everything was compressed in the bottle, so it entered into the dropper causing its density to increase. Once released, the liquid escaped and everything went back to its original way.

3) What is one potential error that you may have encountered.

If the dropper had a crack in it, it could have caused a potential error. The crack could have caused the water to rush into the dropper and permanently increase its density, which would make it sink to the bottom of the bottle.

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Blog #1: Does air have volume?

1) Does air have volume?

Air does have volume. This is shown through this experiment because the cup without the hole was filled with air which acted as a force field preventing the crumpled paper to get wet. Whereas the cup with the hole allowed the air to escape out the opposite end which left nothing to protect the paper.

2) Were there any errors (or potential errors) that were made (or could have been made) during the experiment that could have affected your results?

A potential error that could have occurred would be if the paper could not stay at the bottom of the cup when held upside down.