A doctor orders a blood sample from a child to test for traces of lead in the blood. Which of the following concentration units would best meet this need?
O grams per liter
O molality
O percentage by mass
O parts per million

This line graph compares the growth of plants that were kept in the sun for different amounts of time.a)  on day 7, the plants kept in the sun for 3 hours were how tall? b)  on day 7, the plants kept in the sun for 6 hours were how tall? c)    on day 10, the plants kept in the sun for 9 hours were how tall? d)  on day 11, the plant that was grown with 1 hour of sunlight was how tall? e)  based on the graph, the plant grows best in what amount of sunlight?

The speed of light is around 6.706×10^8 miles per hour. what is the speed of light in units of miles per minute?

6. what does the symbol ah stand for? o one calorie given off by a reaction the specific heat of a substance the heat capacity of a substance the heat of reaction for a chemical reaction