Physical And Chemical Change Lab

1587 Words 7 Pages
Lab #4: Physical or Chemical Changes Formal Report
Purpose
Everything can change from one substance to another, but the creation and the end of some objects never happen. On a beautiful day on the fourth of December in 2015, the class of SNC1D5 started a lab on different kinds of molecules. The objective of this lab was to investigate the chemical and physical changes between different substances. With chemical reactions, reactants or heat, substances can change from one substance to another that have distinct physical and chemical characteristics.
Rationale
A physical change occurs when a reaction happens that does NOT change the material that it 's made of or if the final product is mixture. Usually physical changes involve changing state,
…show more content…
A physical change happens when a substance changes state or shape or size or appearance or texture or color or temperature without changing its composition and when a mixture is created. A chemical change happens when a flame occurs or the mixture gets very hot or cold. Another sign of a chemical change is an odor is released (i.e. a gas) or a noise is heard or the substance changes color or a precipitate is created.
An example of a physical change is ice turning into water due to heat. This is a physical change because, even though the substance changed size and shape, the substance’s molecules never altered and always stayed as water molecules. An example of chemical change is when you light a piece of wood up. This is an example of a chemical change because when it kindles, it creates, light, fire, and smoke, which are all examples of chemical reactions and changes. If you were to do these tests, you’ll find some interesting
…show more content…
This is because a new substance was never formed within these reactions. In the beginning, the heat just converted the solid sugar to its liquid form. This is a physical change because its actual material that it consisted didn’t change, meaning, it’s still sugar, but in liquid form. Mixing solid copper sulphate with water is a physical change because a new substance was never formed and the copper sulphate is still copper sulphate, but in a different state. Plus the fact that the final product turned into a mixture (solution), which is another sign of a physical change. The changes I examined that were chemical in my experiment was when I mixed solid sodium carbonate with hydrochloric acid, copper (II) sulphate solution with liquid sodium carbonate, and during the end of the change when I applied heat to sugar. The test of mixing sodium carbonate with hydrochloric acid was a chemical change because of a creation of gas and the state of the sodium carbonate changing during the process, meaning a chemical reaction must’ve took place. Afterwards, the examination of mixing copper sulphate solution with sodium carbonate was also a chemical change because, after mixing, the whole substance went from transparent to an opaque and completely changed. Plus, two liquids formed a precipitate, which is a sign and

Related Documents