Question

A student wants to investigate whether temperature affects how quickly vinegar reacts with baking soda. Which setup would produce the most reliable results?
Responses

A Use different amounts of vinegar at three temperatures.Use different amounts of vinegar at three temperatures.

B Keep the amount of vinegar and baking soda the same at each temperature. Keep the amount of vinegar and baking soda the same at each temperature.

C Use the same temperature but change the amount of vinegar each time.Use the same temperature but change the amount of vinegar each time.

D Record only the temperature and ignore reaction time.

Answer 1

B

You should keep the amounts of vinegar and baking soda the same at each temperature so temperature is the only variable that changes. Also repeat each temperature several times and measure reaction time the same way to get reliable results.