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CHEMISTRY LAB

By Lat3rGat0r Jan 02, 2015 643 Words
Jashandeep Gill
Gammellos Chemistry

Density is one of the fundamental principles of physics. Density is the reason why a plank of wood floats on water while a piece of metal several times smaller will sink. Density of an object is measured in g/cm³ or g/cc. The equation is D=M/V, D being the density of the object, M being the mass of the object, and V being the volume of the object. Mass is the space an object takes up. It is the amount of matter present in an object. Mass is measured using a triple beam balance. Units used to measure it are grams, metric tons , milligrams , and kilograms . Volume is the amount of space enclosed by a shape or object, how much 3-dimensional space it occupies. It can be occupied by a solid, liquid or gas. The volume can be measured in cubic meters, cubic centimeters, or liters.

Sometime around 250 BCE, the Greek mathematician Archimedes was given the task of determining whether a craftsman had defrauded the King of Syracuse by replacing some of the gold in the King's crown with silver. The story goes that he was easing down into the bath and he noticed that the further down he went, the less he weighed and the more water ran out. (Driver, N.A.). Since he had been with the problem of how to test a gold crown that the king suspected was alloyed with silver without destroying it, he recognized that he could use the ratio of the mass of the object compared to the volume of water it displaced and compare it to a known sample of gold. He was so excited by this that he ran through the streets yelling Eureka, which means, "I've found it!” Archimedes had used the concept of density to expose the fraud. He found out that the more mass an object contains in a given space, the denser it is. Density is also affected by the atomic mass of an element or compound. Since different substances have different densities, density measurements are a useful means for identifying substances.

The ingredients that make up the dressings contents will settle, as their individual weight relative to another may be lighter or heavier. For instance, oil will float to the top and water is heavier than oil (Anon, N.A.) It's an applied chemistry kind of thing. Shaking it will mix them for a very short time and to keep them mixed for longer, you need an emulsifier. The colder a liquid is, the denser it will become. The molecules in colder liquids are closer together in warmer liquids. The molecules are so close together that water becomes a solid. In steam, the water molecules are so far apart that they become a vapor.

The density of the ice cream is less than the density of the root beer. Root beer is very slightly denser than water. Ice cream is frozen milk and cream, which is similar to water, which has a less dense solid state, and rising bubbles probably do help some. Ice also floats in water and ice cream is not whipped. The ice cream in the soda will also create a delayed fizzing reaction. To make an ice cube sink you have to: 1. You will need to buy some heavy water, also known as deuterium oxide. This is just normal water except the hydrogen in the water has a neutron.

2. Pour the water into an ice cube tray,
Place it in the freezer and let it stay there overnight.

3. By morning you will take it out of the freezer and put it in water. Watch as the ice sinks to the bottom of the glass.

References

"How to Make an Ice Cube That Sinks." N.p., n.d. Web. 11 Sept. 2014.

"Visionlearning.com." Visionlearning. N.p., n.d. Web. 11 Sept. 2014.

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