Scientists should control most possible variables in experiments to get the most valid and correct data. If many variables are included in experiments it is more difficult to interpret what is causing a different outcome.
Answer: A 13
Explanation: hope this helps!
D as the two substances could have close boiling points, so if the temperature is not controlled well, both substances will evaporate.
Answer:
D
Explanation:
31 / 2.8 = 11.0714286 L per mole of helium
3.5 / 4 = 0.875 moles
2.8 + 0.875 = 3.675 moles
11.0714286 x 3.675 = 40.6875 L
I believe the answer is "Bohr's model explains the chemical behavior of all atoms."
