When a substance is added to water, bubbles form. How can you confirm the type of change that took place?A.The formation of bubbles is confirmation that a physical change took place.B.Determining that the gas produced in the reaction was different from the original substance would confirm that a chemical change took place.C.The formation of bubbles is confirmation that a chemical change took place.D.Showing that the total mass of the reactants equaled the total mass of the products would confirm that a physical change took place.
Question
When a substance is added to water, bubbles form. How can you confirm the type of change that took place?A.The formation of bubbles is confirmation that a physical change took place.B.Determining that the gas produced in the reaction was different from the original substance would confirm that a chemical change took place.C.The formation of bubbles is confirmation that a chemical change took place.D.Showing that the total mass of the reactants equaled the total mass of the products would confirm that a physical change took place.
Solution
The correct answer is B. Determining that the gas produced in the reaction was different from the original substance would confirm that a chemical change took place.
Here's why:
When a substance is added to water and bubbles form, it suggests that a gas is being produced. This is often a sign of a chemical reaction taking place, as new substances are being formed.
To confirm this, you would need to analyze the gas that has been produced. If the gas is different from the original substance that was added to the water, this confirms that a chemical change has taken place.
This is because in a chemical change, the original substance (or substances) are changed into one or more new substances with different properties.
On the other hand, in a physical change, the form of the substance may change, but its identity does not. For example, if you were to dissolve salt in water, this would be a physical change because the salt is still salt, it has just changed from a solid to a solution.
So, the formation of bubbles alone does not confirm whether a physical or chemical change has taken place. It is the analysis of the gas produced that provides this confirmation.
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