What did the curies conclude about radioactivity based on their studies?
the amount of radioactivity is an extensive property because it varies as the amount of material varies.
the amount of radioactivity is an extensive property because it remains constant as the amount of material varies.
the amount of radioactivity is an intensive property because it varies as the amount of material varies.
the amount of radioactivity is an intensive property because it remains constant as the amount of material varies.

In a laboratory experiment, a fermenting aqueous solution of glucose and yeast produces carbon dioxide gas and ethanol. the solution was heated by burning natural gas in a bunsen burner to distill the ethanol that formed in the flask. during the distillation, the ethanol evaporated and then condensed in the receiving flask. the flame of the burner was kept too close to the bottom of the flask and some of the glucose decomposed into a black carbon deposit on the inside of the flask. during this experiment the following changes occurred. which of these changes involved a physical change and not a chemical change? check all that apply. 1-condensation of ethanol 2-evaporation of ethanol 3- formation of carbon dioxide gas from glucose burning of natural gas 4-formation of ethanol from glucose by yeast 5-formation of a carbon deposit inside the flask

How does a noncompetitive inhibitor reduce an enzyme’s activity?

Robert leaves a chocolate bar in his car while attending school all day. when he goes to his car in the afternoon, the bat has changed into gooey liquid. what happened to the chocolate bar