Question

hydrochloric acid and magnesium were placed in a flask. a stopper with a hole was placed on the flask that allowed a piece of tubing and a gas syringe to collect a gas that was created with the change. identify one way to check and see if this was a chemical change. a seal the hole in the flask b seperate the mixture into two parts c put the mixture in the freezer d measure the temperature of the mixture

Explanation:

Chemical changes often involve energy transfer like heat. Measuring the temperature can show if a chemical reaction (a type of chemical change) is occurring as exothermic or endothermic reactions change the temperature of the mixture. Sealing the hole, separating the mixture, or freezing it do not directly check for a chemical change.

Answer:

D. Measure the temperature of the mixture