Which of the following undergoes change during a chemical reaction?
a. atomic mass of elements in reactants
b. element identities of atoms in reactants
c. total number of electrons in reactants
d. chemical bonds between atoms in reactants

How does the author's purpose in this passage differ from an author writing about her personal struggle living with asthma?

Explain two reasons you think it is important for scientists to search for new ways to treat cancer

How do water’s relative densities as a solid and a liquid differ from that of most other substances? water’s solid and liquid forms have different densities, while most other substances have solid and liquid forms with similar densities. water’s solid and liquid forms have similar densities, while most other substances have solid and liquid forms with different densities. water’s liquid form is less dense than its solid form, while the opposite is true of most other substances. water’s solid form is less dense than its liquid form, while the opposite is true of most other substances.