Question

there are four sketches below. the first sketch shows a sample of substance x. the three sketches underneath it show you must decide whether each of these changes is possible. if a change is possible, you must also decide whether it is a each sketch is drawn as if the sample were under a microscope so powerful that individual atoms could be seen. also, yo entire sample, and that the sample is in a sealed box, so that no matter can enter or leave. sample of substance x change 1 change 2 change 3 change 1 is: impossible a physical change a chemical change change 2 is: impossible a physical change a chemical change change 3 is: impossible a physical change a chemical change

Explanation:

Step1: Analyze Change 1

The molecules in the sample have not changed in composition. Only the arrangement has become more ordered. Since no new substances are formed and only the physical state (arrangement) has changed, it is a physical change.

Step2: Analyze Change 2

The molecules are now more closely - packed and in a regular pattern. This is a change in the physical state (from a more disordered to a more ordered state) without a change in the chemical composition of the molecules. So, it is a physical change.

Step3: Analyze Change 3

New types of molecules are present in the sample. There are now molecules made up of only red spheres, which were not present in the original sample. Since new substances are formed, this is a chemical change.

Answer:

Change 1 is: a physical change
Change 2 is: a physical change
Change 3 is: a chemical change