Answer:
65 miles
Explanation:
The distance travelled till 150 miles is
260 - 150 = 90
But as he walks back although his distance increase his displacement from initial point decrease.
Distance moved from 150 mile post to 175 mile post is
175 - 150 = 25
As he walks backwards in second time in consideration with first time to calculate the displacement we need to substract 90 from 25,
So displacement is 65 miles
Temperature: Higher temperatures increase the energy and therefore the movement of the molecules, increasing the rate of diffusion. Lower temperatures decrease the energy of the molecules, thus decreasing the rate of diffusion. Solvent density: As the density of a solvent increases, the rate of diffusion decreases.
Answer: C. unknown element he predicted would have properties similar to those of aluminum.
Explanation: Mendeleev arranged the elements in order of increasing atomic masses. He left spaces for the elements that were predicted to exist, but were not discovered.
One space was left below Aluminum where an element of mass 70 was predicted to exist with properties similar to Aluminum. It was referred to as eka-Aluminum.
Later it was named as gallium.
The work done on the gas is 37J as the piston compresses it from 1.00 L to 0.633 L.
<u>Explanation</u>:
<u>Given</u>:
Ideal gas temperature is 298 K
Atm=1.00
The piston compresses from 1.00 L to 0.633 L.
<u>To Find</u>:
The Work done on the gas
<u>Formula</u>:
W=P(V2 -V1)
where W is the work done on the gas,
P is the pressure of the chamber,
V2 is the second volume of the chamber,
V1 is the first volume of the chamber.
<u>Solution</u>:
W=P(V2 -V1)
Pressure P is 1 and V2 is 1 and V1 is 0.633
W=(1×10^5)(1-0.633)×10^-3
W=37J
Therefore the work done on the gas is 37J.
