Question

0.543
71
which of the following is true?
a/we know combining substances a and b resulted in a chemical reaction because gas was form.

Explanation:

Step1: Recall chemical reaction indicators

Chemical reactions often have indicators like color change, gas formation, precipitate formation etc.

Step2: Analyze the given data

When Substance A combines with Substance B, gas is formed. Gas formation is a strong indicator of a chemical reaction.

Step3: Check other combinations

When Substance C combines with Substance D, there is no color change, no gas formation and no precipitate formation (implied by “no” in the table). So no chemical reaction.

Answer:

Statement \(a\) (We know combining Substances A and B resulted in a chemical reaction because gas was formed) is True.