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3 years ago

Identify the arrows that show removal of thermal energy when matter changes state.

Chemistry

2 answers:

8090 [49]3 years ago

7 0

Let's identify first the phases of matter inside each of those beakers. The first beaker on the left has a compact shape and has its own volume. So, that must be solid. The middle beaker has a compact shape but it takes the shape of its container. So, that must be liquid. The third beaker on the right is gas because the molecules are far away from each other.

After identifying each states, let's investigate the energy for phase change. Let's start with the arrows pointing to the right. The first arrow to the right is a phase change from solid to liquid. The intermolecular forces in a solid is the strongest among the three phases of matter. So, you would need an input of energy to break them apart into liquid. The same is true for the phase change from liquid to gas. Therefore, all the arrows pointing to the right require an input of energy.

The reverse arrows pointing to the left needs to release energy. The molecules in the gas state are free such that they can travel from one point to another easily. They have the highest amount of energy. So, if you want the molecules to come closer together, you need to remove the energy to keep them in place. Therefore, the arrows pointing to the right require removal of energy.

Phantasy [73]3 years ago

4 0

Answer: the arrows pointing to the right show removal of thermal energy

Explanation: plato

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hurry please! a mixture of He, Ne, and N2 gases has a pressure of 1.348 atm. if the pressures of He and Ne are 0.124 atm and 0.9

Murrr4er [49]

Answer:

A. 0.228

Explanation:

Partial pressure as name suggests is partial pressures that add up to a final (total) pressure.

Here total pressure is 1.348 atm.

He + Ne + N2 = 1.348

0. 124 + 0.996 + N2 = 1.348

N2 = 0.228

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4 years ago

When does hydrogen first begin to fuse into helium in the star formation process?

valentina_108 [34]

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If the star is big sufficient to fuse hydrogen atoms into helium, it's going to enter the phase that our solar is in, referred to as the primary sequence section. a celebrity will enjoy most of its existence in the major series section. At this point nuclear fusion is turning hydrogen into helium.

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2 years ago

Four flasks each contain 100 milliliters of aqueous solutions of equal concentrations at 25°C and 1 atm.

KonstantinChe [14]

Answer:

KCl and Ba(OH)₂.

Explanation:

Hello there!

In this case, since electrolytes are substances characterized by presence of covalent bonds between the atoms forming the compound, it is possible to realize that just KCl and Ba(OH)₂ as they are species composed by cations (K and Ba) and anions (OH and Cl); therefore, they have the capacity to get ionized in aqueous solution and thus transfer electricity when present.

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6 0

3 years ago

Would a change in shape or phase be both a physical and chemical change?

dybincka [34]

Answer:

no only physical

Explanation:

for both of those their chemical properties do not change but their physical properties do making them physical changes

6 0

3 years ago

3.51e23 atoms Fe= g Fe

lubasha [3.4K]

Answer:

Mass of Fe = 32.55 g

Explanation:

Molar Mass of Fe atom = 55.845 g/mol

It means,

1 mole of Fe contains = 55.845 g ..............(1)

From mole concept,

<u>1 mole </u>of Fe contain = $6.022\times 10^{23}$ atom ..........(2)

Replace 1 mole in equation (2) by 55.845 g , it become :

55.845 g of Fe contain = $6.022\times 10^{23}$ atoms

Reverse the equation now

$6.022\times 10^{23}$ atoms of Fe contain =55.845 g

1 atom of Fe contain = $\frac{55.845}{6.022\times 10^{23}}$ g

$3.51\times 10^{23}$ atom contain =

$\frac{55.845}{6.022\times 10^{23}}\times 3.51\times 10^{23}$

on calculation,

$3.51\times 10^{23}$ atom contain = 32.55 g of Fe

Mass of Fe = 32.55 g

7 0

4 years ago