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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?

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samueladesida43

The ways to observe that a chemical change has occurred when two substances come in contact with one another are as follows:

  • Color Change.
  • Production of an odor.
  • Change of Temperature.
  • Evolution of a gas (formation of bubbles)
  • Precipitate (formation of a solid)

What is a chemical change?

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:

  • Color Change.
  • Production of an odor.
  • Change of temperature.
  • Evolution of a gas (formation of bubbles)
  • Precipitate (formation of a solid)

Learn more about chemical changes at: https://brainly.com/question/23693316

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hannahfloresco05

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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