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Irina-Kira [14]
3 years ago
8

Some chemical reactions take a very long time to go to completion or cannot be directly measured. Which law allows one to use tw

o or more thermochemical equations to
calculate the heat of a reaction indirectly?
-Pascal's Principle
-Hess's law of heat production
-Hess's law of heat division
-Hess's law of heat summation
Chemistry
1 answer:
katrin2010 [14]3 years ago
7 0

Answer:

D

Explanation:

If you add two or more thermochemical equations to give a final equation, then you also add the heats of reaction to give the final heat of reaction

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Answer:

 i would assume that it would be (a)

Explanation:

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mass gets lost is nuclear fusion

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you are heating a solution and recording its temperature every 2 min during an experiment. which is your independent variable an
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An independent variable is the variable you are changing in order to measure the dependent variable, which is what you are measuring.

In this example, the

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What it the oxidation number for cl?<br> A. -2<br> B. +2<br> C. -1<br> D. +1
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c.

Explanation:

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What happens with the energy radiated from the Sun once it gets to Earth? (mark ALL correct answers)
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2 years ago
Each of the following solutions is separated from a solution containing pure water with a semipermeable membrane. Assuming they
liberstina [14]

Answer:

Osmotic pressure is a measure of a solution's tendency to attract or take in water from another solution when the two solutions are separated by a semipermeable membrane

The order of increasing osmotic pressure is

  1. 0.7% KCl
  2. 1.5% KCl
  3. 1.8% KCl
  4. 5.0% KCl
  5. 8.6% KCl

Explanation:

Osmotic pressure is the strength of movement of the solvent of a solution through a semipermeable membrane separating solutions of different  concentration thereby causing the solvent (such as water) to move from a region of high solute concentration to a region of lower solute concentration.

The amount of osmotic pressure through a semipermeable membrane separating solutions of different concentration is given by

π = i×M×R×T

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(T) = temperature in kelvin

R = ideal gas constant (0.08206 L atm mol⁻¹K⁻¹)

As seen above , the osmotic pressure is directly proportional to the concentration of the solution thus in the order of increasing osmotic pressure we have

  1. 0.7% KCl
  2. 1.5% KCl
  3. 1.8% KCl
  4. 5.0% KCl
  5. 8.6% KCl
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3 years ago
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