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3 years ago

Which statement best compares the energy involved in melting with the energy involved in boiling for a given liquid?

Chemistry

2 answers:

Soloha48 [4]3 years ago

4 0

C its c trust me i just took the quiz

ruslelena [56]3 years ago

3 0

Answer is: Energy is added to the particles in each change, but boiling requires more energy than melting because the attractions must be completely overcome.

For example, melting point of the water is 0°C and boiling point of the water is 100°C.

While melting, solid water (ice) is changed into liquid water.

While boiling, liquid water is changed into gaseous water (water steam).

Between molecules of water there are hydrogen bonds, which must be brake so water can evaporate.

Hydrogen bond is an electrostatic attraction between two polar groups in which one group has hydrogen atom (H) and another group has highly electronegative atom such as nitrogen (like in this molecule), oxygen (O) or fluorine (F).

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What is the correct name for the compound, P2O5?

VikaD [51]

DiPhosphorus pentoxide or pentaoxide

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3 years ago

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Your old bike left out in the rain starts to rust. What coefficients fill in the blanks to balance the equation?

galina1969 [7]

Hello!

The balanced chemical equation for the rusting of iron is the following:

4 Fe + 3 O₂ → 2Fe₂O₃

The coefficients to balance the equation are 4,3,2. The fundament of this balance is the Law of Conservation of Mass. This Law states that matter is neither created nor destroyed in a chemical reaction, and in a chemical equation, the moles of each atom is conserved in both sides of the arrow. That means that if 4 Fe atoms are on the left side, 4 Fe atoms should be on the right side.

A suggestion for balancing equations is to start with metal atoms, continuing with non-metals, then hydrogen and lastly oxygen.

Have a nice day!

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3 years ago

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The measure of distance from one point to another is?

olasank [31]

The distance from one point to another is the distance traveled by a light beam between them.

If you have the coordinates of the 2 points, then the distance between them is

√ of [ (the difference in their x-values)² + (the difference in their y-values)² ]

6 0

3 years ago

physics During exercise, a person may give off 753,480 J of heat in 30 minutes by evaporation of water from the skin. How much w

Tju [1.3M]

Answer : The amount of water lost was, 333.4 grams.

Explanation : Given,

Heat released = 753480 J

Formula used :

$Q=mL$

where,

Q = heat released = 753480 J

m = mass = ?

L = latent heat vaporization of water = $2260J/g$

Now put all the given values in the above formula, we get:

$753480J=m\times (2260J/g)$

$m=333.4g$

Thus, the amount of water lost was, 333.4 grams.

8 0

3 years ago

What is the mass (in grams) of 6.78 moles of dinitrogen pentoxide

WINSTONCH [101]

<h2>Hello!</h2>

The answer is:

There are 732.24 grams of Dinitrogen Pentoxide $N_{2}O_{5}$ in 6.78 moles of the same compound.

The dinitrogen pentoxide, or nitrogen pentoxide, is a rare salt that consists of anion and cations, and it's an important compound when preparing some kinds of explosives.

So, to answer the question, first, need to look for the molecular formula of the dinitrogen pentoxide, then, use it to calculate the mass in gram of 6.78 moles of the same compound.

The dinitrogen pentoxide formula is:

$N_{2}O_{5}$

Where, the molar mass of each element are:

$N=\frac{14g}{mol}$