CHEMISTRY HIGH SCHOOL

Calculate the value of ?E in joules for a system that loses 115 J of heat and has 150 J of work performed on it by the surroundings.

Answers

Answer 1

Answer:

Hey there!:

E = energy gained (input) - energy lost (output)

∆E = 150J - 115 J

∆E = 35 J

Hope that helps!

Answer 2

Answer:

Final answer:

The change in internal energy (?E) of the system is 35 J based on the first law of thermodynamics.

Explanation:

This problem can be solved using the first law of thermodynamics, which states that the change in internal energy (?E) of a system is equal to the heat added to it (Q) minus the work done by it (W) - this is expressed as ?E = Q - W.

In this particular case, the system loses 115 J of heat, so Q equals -115 J (as it's lost, it's negative), and 150J work is performed on the system which equals +150 J (as work is done on it, it is positive). Therefore, substituting these values into the formula, we get: ?E = -115 J - (-150 J) = 35 J:

So, the change in internal energy of the system is 35 J.

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Related Questions

Two pieces of metal with exactly the same mass are placed on a surface in bright sunlight. The temperature of the 1st block increases by 3°C while the temperature of the 2nd increases by 8°C. If the specific heat of the 2nd block is 0.24 J/g-K, what is the specific heat of the 1st block?
A buffer contains the weak acid HA and its conjugate base A-. the weak acid has a p Ka of 4.82 and the buffer has a pH of 4.25. Which statement is true of the relative concentration of the weak acid and its conjugate base in the buffer? a) [HA} > [A-] b) [Ha} < [A-] c) [HA]=[A-]
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How many grams of H2 would be formed if 34 grams of carbon reacted with an unlimited amount of H2O? The reaction is:C + H2O CO + H2
1) Is this equation balanced?
2) What is the starting substance?
3) What is the ending substance that is asked for in the problem?
Additional info: The atomic mass of C is 12.01 g/mole. The atomic mass of H2 is 2.016 g/mole.

Answers

1) The equation is already balanced;

Left side: 1C, 2H and 1O
Right side: 1C, 1O, 2H

2) Starting substances: water and carbon
There are two starting substances also called reactants. H2O which is a compound and C which is an element.

3) Ending substance asked for: H2.

This is hydrogen gas.

Stoichiometry:

1 mol of C produces 1 mol of H2

12.01 g of C productes 2.016 grams of H2

Ratio: 2.016 g of H2 / 12.01 g of C = X g of H2 / 34 g of C =>

x = 34 g of C* 2.016 g of H2 / 12.01 g of C= 5.707 g of H2

Boyle's law states that thea. volume of a gas varies inversely with pressure.
b. volume of a gas varies directly with pressure.
c. temperature of a gas varies inversely with pressure.
d. temperature of a gas varies directly with pressure.

Answers

The correct answer is A. The volume of a gas varies inversely with pressure. Boyle's law is one of the gas laws we have. According to this law, at a fixed amount of an ideal gas which is at constant temperature, the pressure and volume are inversely proportional with each other.

Answer:

the answer is A pls mark me

Explanation:

What is the name for Na20?

Answers

It is called disodium oxide :)

The name for Na2O is Disodium Oxide

Rainforests are principally responsible for global oxygen turnover true or false

Answers

Answer:

False

Explanation:

Rainforests are very important for global oxygen movement, but they are not the main element for oxygen movement.

Seaweed is the real lung of the world, it is primarily responsible for the global movement of oxygen as it produces more oxygen through photosynthesis than it needs in breathing, and the excess is released into the environment. Rainforests release much less oxygen into the atmosphere worldwide, as most of the gas produced is consumed in the forests themselves. However, rainforests are extremely important and should not be destroyed.

false.....................................

A protein made up of 125 amino acids contains an isoleucine residue at position 54 in its polypeptide chain. which amino acid could be substituted for this isoleucine and be expected to cause the least disruption in the protein's three-dimensional structure?

Answers

To minimize disruption to a protein’s three-dimensional structure when substituting an amino acid, you typically look for amino acids with similar properties. In this case, you have isoleucine (I) at position 54, which is an aliphatic, nonpolar amino acid. Amino acids with similar properties to isoleucine in terms of aliphatic and nonpolar characteristics include leucine (L) and valine (V).

So, substituting isoleucine at position 54 with leucine or valine would be expected to cause the least disruption in the protein’s three-dimensional structure because they share similar properties. These substitutions involve changing one aliphatic, nonpolar amino acid with another, which is less likely to significantly affect the protein’s overall structure and function.

Which cells contain a nucleus and membrane-bound organelles? A. prokaryotic
B. eukaryotic
C. archaean
D. cyanobacteria

Answers

Answer: The correct answer is Option B.

Explanation:

Prokaryotic cells are defined as the cells which does not contain any membrane bound organelles nor they contain nucleus. They are single-celled organisms. For Example: Bacteria, archaea

Eukaryotic cells are defined as the cells which contain membrane-bound organelles. These cells also contain nucleus and also they have DNA which is contained in the nucleus. They can be single-celled or multi-celled organisms. For Example: Animal cells, Plant cells.

Archaea and cyanobacteria are the examples of prokaryotic cells and thus, will not contain nucleus or any membrane-bound organelles.

Hence, the correct answer is Option B.

The cells contain a nucleus and membrane-bound organelles is eukaryotic.

Option B is correct.

How do we explain?

Eukaryotic cells are the most complex cells and contain a nucleus and membrane-bound organelles. Prokaryotic cells, archaea, and cyanobacteria do not have a nucleus or membrane-bound organelles.

The cells that contain a nucleus and membrane-bound organelles are eukaryotic cells \Prokaryotic cells including bacteria and archaea lack a nucleus and membrane-bound organelles. Cyanobacteria are a type of prokaryotic bacteria, so they also lack a nucleus and membrane-bound organelles.

Therefore option B is correct

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