Physical vs. Chemical Quick Check
Which of the following is an example of only a physical change?
1.) the creation of table salt
2.) the green color of the Statue of Liberty
3.) the smell of rotten eggs
4.) dry ice becoming vapor
Which of the following demonstrates a chemical change?
1.) sugar and water mixing to create sugar water
2.) dry ice vaporizing
3.) steam condensing on a mirror
4.) iron (Fe) reacting to water (H2O) and the oxygen (O) to form iron oxide (Fe2O3)
Which of the following is a reliable way to observe that a chemical change has occurred when two substances come into contact with one another?
1.) monitor for the release of gas
2.) observe for color change
3.) test for the release of heat
4.) conduct a test to determine the chemical makeup of the molecules
Which of the following happens during change but does not happen during a physical change?
1.) Atoms of one or more substances rearrange into a new substance
2.) The mass of the substance changes
3.) The state of the substance changes
4.) The appearance of the substance changes, but is still the same substance
Which of the following examples demonstrates the reversibility of a chemical change?
1.) the rotting of eggs
2.) re-freezing carbon dioxide gas into dry ice
3.) recharging batteries
4.) dehydrating sugar water