Oxidation reactions a occur when oxygen is lost or electrons are gained b occur when oxygen is gained or electrons are lost c are always endothermic reactions d are always slow

This drawing shows a human body system. what is the primary function of this body system?

What is the ph of a solution that has a hydrogen ion concentration of 1.0 * 10 -9 m?

Question 3(multiple choice worth 4 points) (04.04 lc) what does it mean when an element is reduced? it empties a valance shell, reducing its atomic radius. it gains electrons, reducing its overall charge. it increases electronegativity, reducing its ability to bond. it loses electrons, reducing its electron number.