What are the signs of a chemical reaction?

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.

8) warming your hands by a fire is an example if which heat transfer? a. conduction b. convection c. radiation d. none of these

What type of context clue you understand the meaning of  quandary?