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3 years ago

A system releases 481 kJ of heat while 390 kJ of work is done on the system. What is the change in internal

Chemistry

1 answer:

rosijanka [135]3 years ago

7 0

Answer:

ΔE = q + w

here q = -136 kj

w = 146

so ΔE = -136 + 146 = 10 kj

thus internal energy of system increases by 10 kj...

I hope this helps! :) I don't know if it's the right one

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What happens when liquid changes to gas?

Nady [450]

Answer:

The temperature that this happens is called the freezing point and is the same temperature as the melting point. As more energy is put into the system, the water heats up, the molecules begin moving faster and faster until there is finally enough energy in the system to totally overcome the attractive forces.

Explanation:

Heating a liquid increases the speed of the molecules. An increase in the speed of the molecules competes with the attraction between molecules and causes molecules to move a little further apart. ... A decrease in the speed of the molecules allows the attractions between molecules to bring them a little closer together.

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3 years ago

Please help thank you

Darina [25.2K]

Based on the Hund's Rule, the three electrons in a 2p orbital are arranged as shown in option C.

<h3>What is an orbital?</h3>

The term orbital refers to a region in space where there is a high probability of finding the electron. We know that an electron in an atom could be defined by the use of four sets of quantum numbers which are;

The principal quantum number
The orbital quantum number
The spin quantum number
The magnetic quantum number

Hund's rule states that, electrons occur singly before pairing takes place. In this case, we can see that the only arrangement that obeys the Hund's Rule is option C.

Learn more about Hund's rule:brainly.com/question/12646067

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1 year ago

How many moles are in 23.8 g of sulfur dioxide

Yuki888 [10]

Answer:

0.371

Explanation:

number of moles = mass / Ar

= 23.8g / 32.1 + (16.0 × 2)

= 0.37129485179 = 0.371 (3 s.f).

hope it helps :)

4 0

2 years ago

A student who is studying atomic reactions creates the following Venn diagram.

Lady bird [3.3K]

A. reaction A: chemical; reaction B: nuclear

Answer:

Solution given:

Circle 2: Reaction B

-Involves neutrons

-Happens inside atomic nucleus

-Releases relatively large amounts of energy

It happens on normal chemical reaction.

Circle 2: Reaction B

-Involves neutrons

-Happens inside atomic nucleus

-Releases relatively large amounts of energy

It happens on nuclear reaction.

5 0

3 years ago

Read 2 more answers

How much NaCl would you dissolve and dilute to the 100.00 mL mark in a volumetric flask with DI H2O to prepare a 0.825 M sodium

adoni [48]

Answer:

4.82 g

Explanation:

To solve this problem we'll use the definition of molarity:

Molarity = moles / liters

We are given the volume and concentration (keep in mind that 100mL=0.100L):

0.825 M = moles / 0.100 L

Now we calculate the number of NaCl moles required:

moles = 0.0825 mol

Then we convert 0.0825 NaCl moles into grams, using its molar mass:

0.0825 mol * 58.44 g/mol = 4.82 g

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3 years ago