Answer:
C. Precipitate the crystals as fast as possible
Explanation:
C. Precipitate the crystals as fast as possible
Precipitation if done fast , can lead to the formation of impure crystals , as impurities also get stuck inside the crystals. So it must be done slowly to obtain the pure crystals . Slower the crystals form , purer they are .
All the other options can lead to a successful recrystallization.
#1 (As trash, synthetic polymers are not biodegradable)
#2 (Landfills can easily fill up with synthetic polymers)
#4 (Recycling synthetic polymers is costly)
The significant figure is only 1 which is just the number 5. The zeros don't count.
Ca is -2
Be is stabilized
Ba is -4
Sr is -3
so it would be => Ba, Sr, Ca, Be
have a wonderful day! :)
Answer:
#atoms C-12 = 3.01 x 10²³
Explanation:
Convert grams to moles and multiply by Avogadro's Number.
6 g C-12 = (6g/12g·mol⁻¹) = 0.50 mol C-12
No. C-12 atoms in 0.50 mol C-12 = 0.50 mol C-12 x 6.02E23 atoms/mole = 3.01E23
