Which of the following is an example of only a physical change?(1 point) Responses dry ice becoming vapor dry ice becoming vapor the green color of the Statue of Liberty the green color of the Statue of Liberty the smell of rotten eggs the smell of rotten eggs the creation of table salt
The creation of table salt is an example of only a physical change.
Which of the following demonstrates a chemical change?(1 point) Responses sugar and water mixing to create sugar water sugar and water mixing to create sugar water iron (Fe) reacting to water((H2O) ) and oxygen(O) to form iron oxide(Fe2O3 ) iron (Fe) reacting to water(open paren cap h sub 2 cap o close paren) and oxygen(O) to form iron oxide(cap f e sub 2 cap o sub 3) steam condensing on a mirror steam condensing on a mirror dry ice vaporizin
Iron (Fe) reacting with water (H2O) and oxygen (O) to form iron oxide (Fe2O3) is an example of a chemical change.
Which of the following is a reliable way to observe that a chemical change has occurred when two substances come in contact with one another?(1 point) Responses test for the release of heat test for the release of heat observe a color change observe a color change monitor for the release of a gas monitor for the release of a gas conduct a test to determine the chemical makeup of the molecules
All of the given options can be reliable ways to observe that a chemical change has occurred when two substances come in contact with one another. For example, a release of heat, a color change, the release of a gas, or conducting a test to determine the chemical makeup of the molecules can indicate a chemical change.
Which of the following happens during a chemical change but does not happen during a physical change?(1 point) Responses The state of the substance changes. The state of the substance changes. The mass of the substance changes. The mass of the substance changes. The appearance of a substance changes, but it is still the same substance. The appearance of a substance changes, but it is still the same substance. Atoms of one or more substances rearrange into a new substance.
Atoms of one or more substances rearrange into a new substance happens during a chemical change but does not happen during a physical change.
Which of the following example demonstrates the reversibility of a chemical change?(1 point) Responses recharging batteries recharging batteries dehydrating sugar water dehydrating sugar water the rotting of eggs the rotting of eggs refreezing carbon dioxide gas into dry ice
Refreezing carbon dioxide gas into dry ice is an example that demonstrates the reversibility of a chemical change.
