Classify each of the following as a homogeneous mixture, heterogeneous mixture, element, or compound: (a) table salt, (b) blood, (c) steel, (d) planet earth.

Astudent conducts an experiment to determine how the amount of water given to a plant affects its growth. what is the independent variable for this experiment?

Is the idea of spontaneous generation supported by redi's experiment? justify your answer in 2-3 sentences?

Before it was launched, a helium-filled balloon had a pressure of 201 kpa at a temperature of 27°c. at an altitude of 15,000 m, the pressure had decreased to 2.5 kpa and the temperature had dropped to -14 °c. the volume of the balloon increased to 59.3 m3. what is the original volume of the balloon? 13 m3 0.85 m3 0.077 m3 1.17 m3