4. Which of the following elements has both the characteristics of some metals and
some nonmetals?

What is the independent variable in this investigation? mass volume sample number substance density

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?

To calculate percent by mass, use the equation below: calculate the percent by mass of each element. %n = % %h = % %o = %