Answer:
it is perpendicular to the surfaces that rub together
A change in temperature or color are two signs that a chemical reaction has taken place.
Answer: B) You are to continue heating the round-bottom flask until all liquid has been distilled.
Explanation:
Fractional distillation refers to a method that's useful for the separation of mixtures of solvents whereby there is less than 40°C in the boiling point difference.
With regards to the options given, the incorrect statement about the procedure for distillation is that you are to continue heating the round-bottom flask until all liquid has been distilled. This isn't correct.
Answer:
A. 0.15 M NaOH, and
E. 0.15 M HNO3
Explanation:
A buffer solution contains a conjugate acid-base pair with both the acid and the base in reasonable concentrations.
NaOH and HNO3 is an acid base pair with relatively equal concentrations. So, they would most likely make a buffer solution.
Except for the Middle East :)
