Which option is the most accurate description of speed?

a: the dog ran around the block in eight minutes

b: the plucked guitar string vibrated at least 50 times

c: the goalie quickly moves left to block the goal

d: the hare finish the race before the tortoise

For each of the compounds below, show that the charges on the ions add up to zero. a. kbr b. cao c. li(2)o d. cacl(2) e. alcl(3)

Calculate the number of kilojoules to warm 125 g of iron from 23.5°c to 78.0°c.

Which of the following describes a compound? (hint: carbon and oxygen bo a. a piece of pure carbon, containing only carbon atoms b. oxygen gas surrounding a solid piece of carbon c. a substance made of two oxygen atoms for each carbon atom carbon and oxygen atoms mixed without being bonded together