Answer:
I have asked question in my profile please tell me the answer
Explanation:
I dont know the answer sorry
Statement B is true because atoms are single particles that come together to form compounds and molecules.
The volume that would be occupied by 0.25 moles sample of H2 is calculated using ideal gas equation formula
that is PV =nRT
P(pressure)= 1.7 atm
V( volume)?
n(number of moles)= 0.250 moles
R(gas constant)=0.0821 l.atm/mol.K
T (temperature in kelvin)=35+273 = 308k
by making V the subject of the formula V=nRT/P
=(0.250 moles x 0.0821 L.atm/k.mol x 308 k)/( 1.70 atm) = 3.7 L of H2 gas
Answers with Explanations:
1. Explain how thermal energy is transferred from the sun to Earth's surface.
"Thermal energy" refers to the<em> energy produced from heat</em>. The sun gives off <em>light energy</em> (solar) through it sunshine. This solar energy penetrates the atmosphere of the earth. Once the atmosphere is heated, it transfers the thermal energy to the Earth's surface in the form of rays. This process is called "radiation."
This can also be done through the process called "conduction." Since air is a poor conductor of heat, thermal energy is only being transferred in the atmosphere. Direct contact between objects is essential in conduction.
It is said that some of the heat transferred to Earth<em> bounces back to the atmosphere.</em> This is because once the Earth's surface heats up,<u> the </u><u>warmest air expands</u><u> and rises towards the atmosphere.</u>
2. How does this energy impact the land and water on Earth?
The sun heats up both the land and water on Earth. However, water is a good conductor of heat so it allows heat to stay in it for a<u> longer period of time. </u>On the contrary, the Earth's land surface is a poor conductor of heat so this allows heat to escape faster than in water. The rays of the sun can penetrate the water at a<em> deeper length</em> than that of the soil.
Answer:
7 mL
Explanation:
To prepare a solution by dilution of another one, we can use the equation:
C1V1 = C2V2
where <em>C</em> is the concentration, <em>V</em> is the volume, <em>1</em> is the initial solution, and <em>2</em> the final solution. V represents the total volume. K₂CrO₄ dissolver by:
K₂CrO₄ → 2K⁺ + CrO₄⁻²
So, 1 mol of K₂CrO₄ results in 1 mol of CrO₄⁻², the in a solution of 8.75x10⁻⁴M of CrO₄⁻², it will be 8.75x10⁻⁴M of K₂CrO₄, so the volume of the stock solution will be:
1.25x10⁻³xV1 = 8.75x10⁻⁴x10
V1 = (8.75x10⁻³)/(1.25x10⁻³)
V1 = 7 mL