There are four sketches below. The first sketch shows a sample of Substance x. T

Question

There are four sketches below. The first sketch shows a sample of Substance x. The three sketches underneath it show three different changes to the sample. You must decide whether each of these changes is possible. If a change is possible, you must also decide whether it is a physical change or a chemical change. Each sketch is drawn as if the sample were under a microscope so powerful that individual atoms could be seen. Also, you should assume that you can see the entire sample, and that the sample is in a sealed box, so that no matter can enter or leave Sample of Substance Change 1 Change 2 Change 3 Change 1 is Change 2 is: Change 3 is: impossible a physical change impossible a physical change a chemical change impossible a physical change ? a chemical change chemical change

Explanation / Answer

Change 1 : a chemical change

Change 2 : a chemical change

Change 3 : impossible

Let us consider red molecules are oxygen (O2) molecules and white molecules are hydrogen (H2) molecules.

Then change 1 has H2O2 (hydrogen peroxide) molecules (and some left H2 molecules) which are formed by chemical reaction only.

Also change 2 has H2O (water) molecules which are formed by chemical reaction only.

Change 3 is impossible because oxygen molecules cannot convert to hydrogen molecules under an conditions neither physical nor chemical.

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