Exploring Changes in Matter

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 water and salt mixed together homogeneously
#2- The paraffin wax changed state from a solid to a liquid back to a solid, these are all state changes which are all physical changes.
Chemical
#3- The small wad of copper changed to a black colour.
#4- The five drops of (NaOH) and (Cu(NO3)2) mixed created a gel like substance
#5- The five drops of (HCI) added to 2 grams of (NaHCO3) created a gas, it fizzed and bubbled up.

Our reasoning or justification of this is that when something undergoes a physical change its chemical composition doesn't change at all, just it's state. An example of this is water(H2O) wether it is a solid, liquid, or gas it is made up of the same molecules regardless of physical state. Nothing new is created during a physical change. When something undergoes a chemical change its chemical composition is changed and it is no longer the same material as when it started. An example of this is when you digest food. The food is no longer the same it is changed into energy, gas, etc. Something new is created when a chemical change has occurred. Based upon this information of chemical and physical changes we can conclude that our claim was correct.

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