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3 years ago

In the first law of thermodynamics, △E = Q-w, what does △E stand for?

Chemistry

2 answers:

Ilia_Sergeevich [38]3 years ago

8 0

Answer:

hello! the awnser is c.the heat added to the system

Explanation:

i took the test and got it right ;)

Damm [24]3 years ago

6 0

<u>Answer: </u>The correct answer is Option B.

<u>Explanation:</u>

First law of thermodynamics states that the energy can neither be destroyed not be formed but it can only be transformed from one form to another.

Here, the internal energy of the system is being transformed to the heat energy and the work done by the system. The equation used to represent first law of thermodynamic is:

$\Delta E=Q-w$

where,

$\Delta E$ represents the internal energy of the system.

Q = heat released or absorbed by the system.

w = work done by or on the system.

Hence, the correct answer is Option B.

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the atom was thought to be indivisible. Explain the significance of Thomson's concept of the electron.

Ludmilka [50]

Answer:

Thomson's experiments with cathode ray tubes showed that all atoms contain tiny negatively charged subatomic particles or electrons. Thomson's plum pudding model of the atom had negatively-charged electrons embedded within a positively-charged "soup.

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3 years ago

You're provided with a bottle labled [CoCl2.6H2O] = 0.056 M in 4.60 M HCl. You heat a small volume of the solution in a hot wate

sweet [91]

Answer: Equilibrium concentration of $[Cl^-]$ at $50^0C$ is 4.538 M

Explanation:

Initial concentration of $CoCl_2$ = 0.056 M

Initial concentration of $Cl^-$ = 4.60 M

The given balanced equilibrium reaction is,

$COCl_2+2Cl^-\rightleftharpoons [CoCl_4]^{2-}+6H_2O$

Initial conc. 0.056 M 4.60 M 0 M 0 M

At eqm. conc. (0.056-x) M (4.60-2x) M (x) M (6x) M

The expression for equilibrium constant for this reaction will be,

$K_c=\frac{[CoCl_4]^{2-}\times [H_2O]^6}{[CoCl_2]^2\times [Cl^-]^2}$

Given : equilibrium concentration of $[CoCl_4]^{2-}$ =x = 0.031 M

Concentration of $Cl^-$ = (4.60-2x) M = $(4.60-2\times 0.031)$ =4.538 M

Thus equilibrium concentration of $[Cl^-]$ at $50^0C$ is 4.538 M

8 0

3 years ago

A satellite and a hockey puck are alike because they illustrate Newton's first law of motion.

lutik1710 [3]

Answer:

It would be True

Explanation:

Because they both have the same push of gravity. Gravity affects all objects equally. If you drop an egg and a watermelon at the same time they would both collide with the floor at the same time.

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3 years ago

Which organic compound builds, maintains, and replaces tissue in your body? A. protein B. carbohydrates C. lipids

Lena [83]

The answer is c. lipids

5 0

3 years ago

How many moles of water can be formed from 0.57 moles of hydrogen gas?

BartSMP [9]

Answer:

0.57 water

Explanation:

To solve this problem, we need to write the reaction expression first.

The reactants are oxygen gas and hydrogen gas.

They react to give a product of water

2H₂ + O₂ → 2 H₂O

Given that;

Number of moles of hydrogen gas = 0.57moles

From the balanced reaction expression;

2 moles of hydrogen gas produces 2 moles of water

So;

0.57mole of hydrogen gas will also produce 0.57 water

7 0

2 years ago