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Andrew [12]
3 years ago
9

HELP!!!! ILL GIVE THE CROWN THINGY THING!!!!!!!!!! DUE SOON!!!!!!!!! PLS HELP!!!!!!!!!!

Chemistry
1 answer:
xxTIMURxx [149]3 years ago
8 0

Answer: A. Most radiation reaching Earth from space is blocked by the atmosphere. Therefore, some telescopes must be placed above the atmosphere.

Explanation: Astronomers have a huge problem detecting radiation from space because the Earth's atmosphere blocks most of it and stops it from reaching the surface.

Hope this helps :)

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Letters B and C on this model show us daytime on Earth. Both locations have daytime because of A) Earth's tilt on its axis. B) E
ch4aika [34]
Answer is D earths distance from the sun
7 0
3 years ago
Solution a is a 1.0 m solution with a nonionic solute and water as the solvent. solution b is a 1.0 m solution with the same non
solniwko [45]
<span>The solution of ethanol will have the greatest increase in boiling point.
   The formula for boiling point elevation is:
 Î”Tb = Kb · bB
 where
 Î”Tb = boiling point elevation
 Kb = ebullioscopic constant for the solvent
 bB = molarity of the solution
   Since in the solute is nonionic, we don't have to worry about the molecules of the solute breaking up into multiple ions, thereby increasing the effective molarity of the solution. So which ever solvent has the highest ebullioscopic constant, will have the greatest increase in boiling point. This constant can be calculated by the equation:
 Kb = RTb^2M/ΔHv
 where
 R = Ideal gas constant
 Tb = boiling point of pure solvent
 M = Molar mass of solvent
 Î”Hv = heat of vaporization per mole of solvent
   For our purposes, we can ignore the idea gas constant, and instead look at only the boiling point, molar mass, and heat of vaporization. Then calculate Tb^2M/ΔHv So let's do so:
 (Note: Not bothering to be precise in molar mass. If the end result is close, then I'll bother. Otherwise, just using nice round numbers).
   Water
 Boiling point: 373.15 K
 Molar mass: 18 g/mol
 heat of vaporization: 40660 J/mol
 Tb^2M/ΔHv: 61.64
   Ethanol
 Boiling point: 351.52 K
 Molar mass: 46 g/mol
 heat of vaporization: 38600 J/mol
 Tb^2M/ΔHv: 147.26
   The value of Tb^2M/ΔHv is significantly greater for ethanol than it is for water (by more than 2 to 1), so it will have the greatest increase in boiling point.</span>
4 0
3 years ago
Read 2 more answers
-The picture goes to Activity 2
Alborosie

Answer:

Activity 1: Since the only forces apposing the upward movement of the load are gravity and air resistance the formulas of which can both be solved with weight then with constant variables for gravity and air, effort IS directly proportional to weight.

Activity 2:

Inclined plane.

to make lifting easier; raising or lowering a load.

Explanation:

hope this helps.

4 0
4 years ago
Read 2 more answers
Which of the following is considered a renewable resource?
Mashutka [201]

Explanation:

I can give you some examples;

1) water

2) biomass

3)Soil

4) forest...

I hope this will help you

5 0
3 years ago
Read 2 more answers
Briefly explain why the bulk temperature of the water remains low (at room temperature)
elena55 [62]
If the humidity of the room is low, the water that contacts the air directly could evaporate and takes some energy from the bulk thus decreasing its temperature steadily. This allows the water to have a lower temperature.
4 0
3 years ago
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