Q1. Which are characteristics of a mixture? (Select all that apply.) made up of two or more substances

can be evenly mixed

can appear unevenly mixed

are chemically combined

The atoms of a solid aluminum can are close together, vibrating in a rigid structure. if the can is warmed up on a hot plate, what happens to the atoms?

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?

Which fossil fuel is mainly used for heating and cooking? a. electricity b. coal c. petroleum d. natural gas