D all apear yellow under a micrscope
Answer:
Final number of moles = 0.675 mol
Mass = 2.7 g
Explanation:
Given data:
Initial volume of gas = 2.00 L
Final volume of gas = 2.70 L
Initial number of moles = 0.500 mol
Final number of moles = ?
Solution:
Formula:
V₁/n₁ = V₂/n₂
V₁ = Initial volume
n₁ = Initial number of moles
V₂ = Final volume of gas
n₂ = Final number of moles
Now we will put the values in formula.
2.00 L /0.500 mol = 2.70 L / n₂
n₂ = 2.70 L× 0.500 mol /2.00 L
n₂ = 1.35 L.mol / 2.00 L
n₂ = 0.675 mol
B)
Grams of helium added = ?
Solution:
Mass = number of moles × molar mass
Mass = 0.675 mol× 4 g/mol
Mass = 2.7 g
C.
Explanation:
As a pendulum swings from its highest to its lowest position along an arc, what happens to its kinetic energy and potential energy? The potential energy decreases while the kinetic energy increases.
Answer: A physical change is a change that can be undone.
Explanation: An example of this is mixing red blocks, green blocks, and blue blocks. You can easily separate them.
Answer:
The correct answer will be "100.7 mL". The further explanation is given below.
Explanation:
The given values are:
Temperature,
ΔT = 1°C
Mass,
m = 70 kg
c = 3.480 J/Kg.K
Amount of released heat will be:
⇒
On putting the estimated values, we get
Let M will be the amount of evaporated water at the temperature of 37°C.
Required heat will be:
⇒
Now, Lost heat will be equal to the required amount of heat.
⇒
On applying cross-multiplication, we get
Now,
⇒
On putting the estimated values, we get