Crystal is trying to get in shape for softball season, so she takes a hip hop dance class at the gym for 45 minutes three days a
week. She wears a heart rate monitor and finds that her heart rate reaches 125 beats per minute, but her target heart rate zone is 142—180 beats per minute. Which of the following could she do to get her heart rate into the target zone? A.Dance at a faster pace B.Dance at a slower pace
C.Dance for a longer length of time
D.Dance for a shorter length of time
<span>To get into shape for the incoming softball season, Crystal, who enrolled into a hip hop dance class and targets that her heart rate be 142-180 beats per minute. With her current heart rate of only 125 beats per minute, she should dance at a faster pace. Thus, the answer to this item is letter A given that the duration of her dance is fixed at 45 minutes. </span>
When the particles are smaller, there is a larger surface area for the acid particles to attack. More of them collide with the carbonate and produce more gas faster. In the real experiments you do, you could change the size of the calcium carbonate chips by grinding them up.
