The student let the water bath boil away, so the water level was much lower during the last determination. A large part of the flask was out of the water, and the upper part of the flask was noticeably cooler than the lower part. What effect would this error have on the calculated density and molar mass?

You exhale co2 which is produced during cellular respiration.  co2 combines with the water in your blood's plasma to make up one half of the body's most important buffer pair, carbonic acid.  the more physical activity you engage in, the more co2 your body is producing.  you can see this by putting some of the cabbage indicator in a glass and then blowing bubbles into it through a straw.  can you see a change in the color of the indicator?