how do you know that a chemical reaction has occurred

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  • What are the 5 signs of a chemical reaction?

  • Some signs of a chemical change are a change in color and the formation of bubbles. The five conditions of chemical change: color chage, formation of a precipitate, formation of a gas, odor change, temperature change. Also, how does a chemical reaction take place?

  • How can you tell if a reaction has taken place?

  • Other chemical changes can be felt, for instance when the reaction causes heat to be released. Some chemical changes can be heard, for instance when an explosion takes place. Learners should mention that the reactants are those substances that are present before a chemical reaction has taken place. They react to form the products.

  • How can you tell if a chemical change has occurred?

  • Sometimes chemical changes can be smelled, for instance when a new material is formed that has a strong smell. Other chemical changes can be felt, for instance when the reaction causes heat to be released. Some chemical changes can be heard, for instance when an explosion takes place.

  • Are bubbles a sign of a chemical reaction?

  • Bubbles may be a sign that a chemical reaction has occurred. Although bubbles from a liquid are due to a physical change of state, bubbles can also be produced by a chemical reaction. For example, yeast in bread can produce bubbles of carbon dioxide that help the bread to rise.

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