Jesse Chemistry

Exploring Changes in Matter    The question we were trying to answer was "Which changes are examples of a chemical change, and which are examples of a physical change". During our investigation we had five different scenarios where we had to combine two substance or add heat to a certain one. We observed and wrote our observations in our notebook of each scenario to determine which were an example of a chemical or physical change. We divided up each scenario between us and then conducted the experiments.     Our claim was that the water/salt and the paraffin wax were physical changes and the copper wire, sodium hydroxide/copper nitrate and the hydrochloric acid/sodium bicarbonate were chemical changes. Evidence: Scenario #1 Water/Salt: The salt dissolved into water, giving it a foggy color. Scenario #2 Copper Wire: We placed it into a crucible and heated it with a Bunsen burner and it changed               ...

Exploring Measurement in the Food Industry The question we were trying to answer was "Do you get what you pay for"? We were investigating to see if the weight of the chips matched the net weight listed on the bags by weighing the bags with and without their contents(Net Weight 28.3g) . During our investigation we first weighed the bag with its contents inside then weighed it again without its contents. We conducted our experiment this way so we can estimate how much the chips themselves weigh.     We claimed that the bags of chips are neither precise(range ≤.20g) or accurate(weight of chips between 28.2g-28.4g) meaning you don't get what you pay for. Looking at the evidence bag 4 was the only one accurate. For precision you take the greatest chip weight and least weight and subtract them, we got .8 for the range meaning the chips aren't precise either. For that reason you don't  get what you pay for, you will most likely end up with more than you expe...