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The ways to observe that a chemical change has occurred when two substances come in contact with one another are as follows:
A chemical change is a any process in which reactants are changed into products by the breaking or creation of chemical bonds.
A chemical change is opposed to a physical change in the sense that a physical change affects only the form of a chemical substance, but not its chemical composition.
The ways to observe if a chemical change has occured are as follows:
Learn more about chemical changes at: https://brainly.com/question/23693316
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Answer:
(Question) Which of the following is an example of only a physical change?
(Answer) dry ice becoming vapor
(Question) Which of the following demonstrates a chemical change?
(Answer) iron (Fe) reacting to water((H2O)) and oxygen(O) to form iron oxide(Fe2O3)
(Question) 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?
(Answer) conduct a test to determine the chemical makeup of the molecules
(Question) Which of the following happens during a chemical change but does not happen during a physical change?
(Answer) Atoms of one or more substances rearrange into a new substance.
(Question) Which of the following example demonstrates the reversibility of a chemical change?
(Answer) recharging batteries
Explanation:
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