A second-order reaction starts with an initial concentration of 0.200 mol/L of the reactant. If the rate constant is 3.9 × 10–2 L/mol·s, what is the time required to decrease the initial concentration to 0.070 mol/L?

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

If two objects at different te,peraure are in contact with each other what happens to their temperature

Which of the following is not one of the steps in the scientific method a. hypothesize b. summarize c. analyze d. familiarize