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When we mix  vinegar and milk , the components will react and the  casein  from the milk will be separated out as  solid lumps . Although there is an apparent change in the physicality of the mixture, the change happens chemically at a molecular level,  thus, it is a chemical change.

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STEP 1:  Heat Milk STEP 2:  Add Vinegar STEP 3:  Drain once solid lumps are visible

Once the casein solidifies, it can be used as a plastic. It decomposes after three weeks unlike our single use plastics!

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Upon sprinkling juice of orange peel to the balloon surface, it causes the balloon to pop due to the  limonene  contents of the peel. Both the rubber of balloon and the limonene are  hydrocarbons  which means they are both  non-polar . The moment that a non-polar interacts another non-polar, it gives off an  dissolving reaction . In this case, the balloon surface dissolves/reacts with the limonene so it pops

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STEP 1:  prepare water balloons and a lemon or orange peel STEP 2:  squeeze the peel down to the balloon

NOT ALL BALLOONS POP WITH LIMONENE OIL. This is because some balloons are very thick due to the fact that the polymer strands are cross-linked by sulfur atoms which makes it hard to break!

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A chemical change occurs when the substance's composition is changed. When bonds are broken and new ones are formed a chemical change occurs. Physical Change on the other hand are limited to changes that result in a difference in display without changing the composition. -information from chem.libretexts

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Kuntzleman, T. (March 24, 2015). How Does an Orange Peel Pop a Balloon? Chemistry, of Course!.  ChemEd Xchange.  Retrieved from: https://www.chemedx.org/blog/how-does-orange-peel-pop-balloon-chemistry-course Merrifield, R. (May 8, 2018). Not so fantastic single-use plastic to get an eco-friendly makeover.   PhysOrg.  Retrieved from: https://phys.org/news/2018-05-fantastic-single-use-plastic-eco-friendly-makeover.html Chemical Changes vs. Physical Changes. (n.d.).  Chemistry Libre Texts.  Retrieved from: https://chem.libretexts.org/Bookshelves/Physical_and_Theoretical_Chemistry_Textbook_Maps/Supplemental_Modules_(Physical_and_Theoretical_Chemistry)/Fundamentals/Chemical_Change_vs._Physical_Change Babcockabelard. (February 6, 2021). A balloon will explode when it touches a lemon. [Video]. Retrieved from: bit.ly/3Akfl3M Just for fun. (February 22, 2021). How to Make a quick cheese. [Video]. Retrieved from: https://bit.ly/3AwNf5v

Mickhaella Valerio - Laboratory Exercise No. 2 Matter

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