Okay so i already answered this question a. what is the density of an 84.7g sample of an unknown substance if the sample occupies 49.6cm^3? but question b. stumped me so question b. is what volume would be occupied by 7.75g of this same substance?

How do you know how many valence electrons an atom has?

Avector a⃗ has a length of 8.6 m and points in the negative x direction. find the x component of the vector −3.7a⃗ .

When can a theory be modified if a new type of technology allows for new observations that raise new questions? a-immediately, while the questions about the theory are being asked b-after new hypotheses related to the theory are tested in experiments c-only after the new observations disprove all parts of the theory d-while scientists begin to think about how the theory could improve