CMaughan33

The purpose of this lab was to tell see and be able to discern the difference between Changes in Matter and tell whether they are physical or chemical changes. We ran several different experiments to gain our information. During our investigation we experimented with 1st- H20 and table salt mixed. 2nd- a small wad of copper was heated. 3rd- 5 drops of  sodium hydroxide (NaOH) and 5 drops of copper nitrate (Cu(NO3)2) mixed. 4th- 5 drops of hydrochloric acid (HCI) are added to 2g of sodium bicarbonate (NaHCO3). 5th- Paraffin wax is subjected to heat in a hot water bath. We ran these different experiments to get practice at knowing whether something is physical or chemical. Our claim was that The #1-H2O mixed with NaCl, and the #2-Paraffin wax in the hot-water bath are both physical changes. #3The small wad of copper subjected to heat, #4 the NaOH and CuNO32 mixed, #5The HCI and NaHCO3 mixed, are all chemical changes. The evidence for this is listed down below. Physical #1- The ...

1) What tasks have you completed recently? - Recently I performed a density lab in which you weigh pennies and put them in order by date, then put them in a graduated cylinder with 30ml of water by 2s and measure the difference of volume to find their density. I also performed a activity where your task was to find the thickness of aluminium foil. In order to do so you had to measure the length and width of the foil and then weigh it. After recording those results I calculated the area, volume, and then find the thickness. 2) What have you learned recently? - Recently I've learned many things. I learned how to find the density of an object by using water levels to see the amount of displacement that certain object creates. You just subtract the difference of volume by your initial volume. I also learned more about Significant digits and what rules apply to how many Sig digs you keep. If you are multiplying something you can only keep your lowest amount of Sig digs so for example...