Why is the r. a.m. value used? O A. Atoms are too small for their masses to be measured directly.
B. A single atom cannot be isolated, so only the average size of a group of atoms can be
measured.
C. The ra
r. a.m. value is used to determine how many isotopes an element has.
D. None of these

In an investigation that uses the scientific method, which step immediately follows making a hypothesis? o summarizing the results o asking a question o making observations designing an experiment mark this and retum save and exit next submit

Three cards with holes are arranged in a straight line. a light is shined through the first card’s hole and travels through all three cards. what does this tell you about light rays? a) that light is reflected b) that light is refractive c) that light travels in a straight line d) that light does not travel in a straight line

If 3 moles of a compound use 24 j of energy in a reaction, what is the a hreaction in j/mol?