A chemical reaction occurs in a test tube. The mass of reactants and test tube is 23 g before the reaction occurs. During the reaction, a gas is formed and the reaction bubbles vigorously. The gas escapes into the air. After the reaction, the mass of the products and test tube is 22g.
What evidence do you have that a chemical reaction has occurred?
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The evidence that a chemical reaction has occurred includes the change in mass before and after the reaction. The total mass decreases by 1g, indicating that a gas was produced during the reaction and escaped into the air. The formation of a gas is a common indicator of a chemical reaction, as it signifies a change in the chemical composition of the reactants to form new products. Additionally, the vigorous bubbling during the reaction suggests that a chemical change was taking place within the test tube.
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