Why would a person choose to tie a helium-filled balloon to a child's wrist instead of simply having the child hold on to it? a. helium is less dense than air, so it will float above air if the child lets go of the balloon. b. helium is more dense than air, so it will sink below air if the child lets go of the balloon. c. helium is less dense than air, so it will sink below air if the child lets go of the balloon. d. helium is more dense than air, so it will float above air if the child lets go of the balloon.

Calculate the ratio of h+ ions to oh– ions at a ph = 6. find the concentration of h+ ions to oh– ions listed in table b of your student guide. then divide the h+ concentration by the oh– concentration. record this calculated ratio in table a of your student guide. compare your approximated and calculated ratios of h+ ions to oh– ions at a ph = 6. are they the same? why or why not? record your explanation in table a. what is the concentration of h+ ions at a ph = 6? mol/l what is the concentration of oh– ions at a ph = 6? mol/l what is the ratio of h+ ions to oh– ions at a ph = 6? : 1

More solar radiation is absorbed by earth’s surface than by

4. if you were an astronaut on the moon, what would you experience? what would you see from your perspective?