Cindy runs 2 km every morning. she takes 2 minutes for the first 250 meters, 4 minutes for the next $1, 000 meters, one minute for the next 350 meters, and three minutes for the rest. cindy's average speed for the entire run is meters per minute. 1 km is the same as 1000.

Achemistry student weighs out of phosphoric acid , a triprotic acid, into a volumetric flask and dilutes to the mark with distilled water. he plans to titrate the acid with solution. calculate the volume of solution the student will need to add to reach the final equivalence point. round your answer to significant digits.

Drag each label to the correct location on the chart. classify each reaction as endothermic or exothermic.

Astudent pours 10.0 g of salt into a container of water and observes the amount of time it takes for the salt to dissolve. she then repeats the process using the same amounts of salt and water but this time she slowly stirs the mixture while it is dissolving. the student performs the experiment one more time but this time she stirs the mixture rapidly. the dependent variable in this experiment is: time for salt to dissolve speed of stirring amount of water mass of salt