Answer:
D
Explanation:
D. A force acting in the direction opposite the object’s motion is removed from the object
Answer:
Explanation:
The following compounds are soluble in water and will dissociate when dissolved in water.
A) barium hydroxide
B) ethanol
C) glucose
D) silver nitrate
E) dichloromethane
F) postassium chloride
The other compounds ethanol and glucose are also soluble in water but do not dissociate when dissolved in water.
Yes it could, but you'd have to set up the process very carefully.
I see two major challenges right away:
1). Displacement of water would not be a wise method, since rock salt
is soluble (dissolves) in water. So as soon as you start lowering it into
your graduated cylinder full of water, its volume would immediately start
to decrease. If you lowered it slowly enough, you might even measure
a volume close to zero, and when you pulled the string back out of the
water, there might be nothing left on the end of it.
So you would have to choose some other fluid besides water ... one in
which rock salt doesn't dissolve. I don't know right now what that could
be. You'd have to shop around and find one.
2). Whatever fluid you did choose, it would also have to be less dense
than rock salt. If it's more dense, then the rock salt just floats in it, and
never goes all the way under. If that happens, then you have a tough
time measuring the total volume of the lump.
So the displacement method could perhaps be used, in principle, but
it would not be easy.
Answer:
- S, is the reactant in excess
- Fe is the limiting reactant
- Mass of FeS formed: 12 g
Explanation:
This is the reaction:
Fe (s) + S (l) → FeS
Ratio in this reaction is 1:1
We have 7.62 g of Fe, and 8.67 g of S.
Let's convert to moles:
Mass / Molar mass = moles
Molar mass Fe = 55.8 g/m
Molar mass S = 32 g/m
Moles Fe : 7.62g / 55.8 g/m = 0.136 moles
Moles S: 8.67 g /32 g/m = 0.271 moles
If we have 0.136 moles of Fe, we need 0.136 moles of S and we have 0.271 . S, is the reactant in excess.
For 0.271 moles of S, we need the same amount of Fe and we only have 0.136, so Fe is the limiting reactant.
Ratio between Fe and FeS is also 1:1 so 0.136 moles of Fe generates 0.136 moles of FeS
Molar mass FeS =
Moles - molar mass = mass
87.9 g/m . 0.136m = 12 g