Seudónimo Seudónimo

11-10-2018
Chemistry

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Chemical compounds undergo both physical and chemical changes. Which of the following is an example of a chemical change

Question 3 options:

heating a solid material to a liquid form

combining oxygen gas and hydrogen gas to form liquid water

cooling a gas into its liquid form

salt (NaCl) being dissolved into water

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MemeulousIsGr8 MemeulousIsGr8

24-10-2018

Combining oxygen gas and hydrogen gas to form liquid water is a chemical change. Pretty sure the rest are physical changes because a chemical change happens when a substance is altered completely. A physical change is when a substance keeps its components (I dunno what word to use) but just changes into a diferent shape. At least thats how my teacher explained it to me.

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