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A) Which of the following is an example of only a physical change? (1 point)

dry ice becoming vapor
the green color of the Statue of Liberty
the creation of table salt
the smell of rotten eggs
A) Which of the following demonstrates a chemical change? (1 point)
steam condensing on a mirror
sugar and water mixing to create sugar water
dry ice vaporizing
iron (Fe) reacting to water((H O)) and oxygen(O) to form iron oxide( ) 2 Fe2O3
A) 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)
test for the release of heat
monitor for the release of a gas
conduct a test to determine the chemical makeup of the molecules
observe a color change

3 answers

A) The example of only a physical change is dry ice becoming vapor. This is a change in the state of matter (sublimation) without altering the chemical composition of the substance.

A) The option that demonstrates a chemical change is iron (Fe) reacting to water (H₂O) and oxygen (O) to form iron oxide (Fe₂O₃). This involves a chemical reaction that produces a new substance.

A) A reliable way to observe that a chemical change has occurred when two substances come in contact with one another is to monitor for the release of a gas. The production of gas is a common indication of a chemical reaction taking place.

A) Which of the following happens during a chemical change but does not happen during a
physical change? (1 point)
The mass of the substance changes.
The appearance of a substance changes, but it is still the same substance.
Atoms of one or more substances rearrange into a new substance.
The state of the substance changes.
A) Which of the following example demonstrates the reversibility of a chemical change?
(1 point)
recharging batteries
refreezing carbon dioxide gas into dry ice
dehydrating sugar water
the rotting of eggs

A) The statement that happens during a chemical change but does not happen during a physical change is: Atoms of one or more substances rearrange into a new substance. This is a key characteristic of a chemical change, as new substances are formed.

A) The example that demonstrates the reversibility of a chemical change is: recharging batteries. This process involves a chemical change during discharge and allows for the chemical reaction to be reversed to restore the original reactants during charging.