Exploring Changes of Matter

Which examples of matter were chemical and physical ?

The task was to carry out and observe 5 scenarios, then determine if a physical or chemical change occurred. The first was to mix 100g of water (H2O) and salt (NaCI) together. The second, we heated up a copper wire in a crucible over fire. The third, was to put 5 drops of sodium hydroxide (NaOH) and 5 drops of copper nitrate (Cu(NO3)2). Fourth, we put 5 drops pf hydrochloric acid (HCI) in 2g of sodium bicarbonate (NaHCO3). Then finally, we subjected paraffin wax to heat in a hot water bath. After conducting each experiment , we then recorded each scenarios reaction beside its procedure to later discuss.

-100g of water mixed with 5g of table salt: Turned to salt water and looked foggy
-A small wad of copper wire is placed in a crucible and heated: Copper turns to black
-5 drops of sodium hydroxide with 5 drops of copper nitrate: Change in state/Composition (jelly)
-5 drops of hydrochloric acid added in 2g of sodium bicarbonate: Fizzed and bubbled into gas
-Paraffin wax is subjected to heat in a hot water bath: Melts in to a liquid then turns back into a solid when cooled (change in state)

Chemical change is when a substance changes into another and its composition of matter does change. Examples of chemical changes were the heated copper wire because after turning black it was no longer copper, the 5 drops of (NaOH) with copper nitrate because it was no longer a liquid and the 5 drops of (HCI) in sodium bicarbonate because it turned into a gas. Examples of physical change were the salt water because the salt and water remained the same and paraffin wax because although it did melt in to a liquid, the substance remained the same.



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