Which formula is used to calculate acceleration? worth 30 points

a. time ÷ change in speed
b. time × change in speed
c. change in speed ÷ time
d. change in speed × time

During chemistry class, carl performed several lab tests on two white solids. the results of three tests are seen in the data table. based on this data, carl has concluded that substance b must have bonds.

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

When did stem cell research become known ? who discovered stem cell? what experiments or studies have been conducted so far?