Examples of Chemical Changes

 



As we have discovered in the previous post Chemical changes are those which change in which one or more new substances are formed. Below are various examples of Chemical change:

 Metallic Oxides


Formation of metal oxides are examples of chemical changes. They are formed by the reaction of oxygen in air.
– Burning of Magnesium ribbon:
– 2Mg + O2 → 2MgO
– The product formed is the oxide of magnesium, which is in the form of ash. It does not look anything like the magnesium ribbon used for burning.

Reaction of metallic oxides with water

  • Reaction of metal oxides with water form metal hydroxides.
  • Example dissolving Magnesium oxide in water, by stirring the ash very well with water.
  • MgO + H2O → Mg(OH)2
  • The product formed is basic in nature and turns red litmus paper → blue

Reaction between baking soda and vinegar

When a pinch of baking soda is added to vinegar we hear a hissing sound and observe the formation of bubbles.

– Vinegar (Acetic Acid) + Baking Soda (Sodium bicarbonate)  → CO2 (Carbon dioxide) + Other products
The carbon dioxide produced during the reaction of Vinegar and baking soda, when passed through lime water gives calcium carbonate, as follows:
– CO2 + Ca(OH)2 (lime water) → Calcium Carbonate (CaCO3) + H2O
– The calcium carbonate turns lime water milky.

Kindly watch the following video for better understanding


Attempt the following quiz to know how much you have learned

https://forms.gle/VhQQU5W4a5VMSBPf9

References

  1. https://www.thoughtco.com/thmb/BvoqI4sx98BYkrmGinbubaOSV3k=/1500x0/filters:no_upscale():max_bytes(150000):strip_icc()/TC_608334-chemical-change-examples-5aabebea31283400371a753e.png
  2. https://d2cbg94ubxgsnp.cloudfront.net/Pictures/480xAny/4/5/1/145451_a5100208-magnesium_ribbon_burning-spl.jpg
  3. https://offtheshelf.typepad.com/.a/6a014e8a618bd6970d017c318ab014970b-pi
  4. https://www.youtube.com/watch?v=tIQvYMk2YI0

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