Answer:
When 0.356 moles of PbS completely react 0.356 moles of PbO and 0.356 moles of SO₂ are produced.
Explanation:
2PbS (s) + 3O₂ (g) → 2PbO (s) + 2SO₂ (g)
2 mol PbS ____________ 2 mol PbO
0.356 mol PbS ________ x
x = 0.356 mol PbO
2 mol PbS ____________ 2 mol SO₂
0.356 mol PbS ________ x
x = 0.356 mol SO₂
Sodium bicarbonate (or baking soda) will cause both exothermic and endothermic reactions when added to water. It becomes either unstable or stable carbonic acid, which will eventually become CO2. The reaction would be exothermic is when H2CO3 (Carbonic Acid unstable) is formed and endothermic is when CO2 is.
Answer:
they lose their water
Explanation:
When exposed to air washing soda crystals lose their water of crystallisation and become amorphous. ∴ The phenomenon is called efflorescence.
<u>Answer:</u> D. the ionic compound calcium fluoride
The correct option here is the fourth one.
<u>Explanation:</u>
Salt like compounds addition to water is likely to be inducing certain changes in temperature of freezing into solid and also alter the temperature of boiling.
It is noticed that addition of salts in water mostly tends to get lower the freezing temperatures from the original freezing point of water and among the given 3 options calcium fluoride tends to lower the freezing point most when compared to others.
Thus as vant hoff factor is highest factor for and the freezing point will be lowest.
Answer:
the answer is B
Explanation:
According to my notes, the mitochondria converts stored food in to usable food.