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Eva8 [605]
3 years ago
8

Which of these is an example of a reversible physical change? A. boiling water B. breaking glass C. cracking an egg D. splitting

a diamond
Chemistry
1 answer:
love history [14]3 years ago
6 0

Answer:

The answer is A.

Explanation:

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How many milliliters of water are needed to prepare a 3.5M solution of NaOH if you have .5mol of the solute
Mamont248 [21]

Answer:

1335.12 mL of H2O

Explanation:

To calculate the mililiters of water that the solution needs, it is necessary to know that the volume of the solution is equal to the volume of the solute (NaOH) plus the volume of the solvent (H2O).

From the molarity formula we can first calculate the volume of the solution:

M=\frac{solute moles}{solution volume}

Solutionvolume=\frac{solute moles}{M} =\frac{5mol}{3.5\frac{mol}{L} } =1.429L

The volume of the solution as we said previously is:

Solution volume = solute volume + solvent volume

To determine the volume of the solute we first obtain the grams of NaOH through the molecular weight formula:

MW=\frac{mass}{mol}

Mass=MW*mol=39.997\frac{g}{mol} *5mol=199.985g

Now with the density of NaOH the milliliters of solute can be determined:

d=\frac{mass}{volume}

Volume=\frac{mass}{d} =\frac{199.985g}{2.13\frac{g}{mL} } =93.88mL of NaOH

Having the volume of the solution and the volume of the solute, the volume of the solvent H2O can be calculated:

Solvent volume = solution volume - solute volume

Solvent volume = 1429 mL -  93.88 mL = 1335.12 mL of H2O

7 0
3 years ago
Who discovered significance of 6.022 x 10 to the 23 power
Masja [62]
6.02 x 10^23 is Alvogrado's number (Amedio Alvogrado is the name). This formula is determined to find the amount of particles within a substance by a mole.
I hope this helps!
6 0
3 years ago
How is the Hvap used to calculate the mass of liquid boiled by 1 kJ of energy?
coldgirl [10]
The heat used in phase changes is calculated by multiplying the mass of the substance by the energy of the phase change. In this case, for liquid to boil, we would find total heat by multiply the mass of liquid by the latent heat of vaporization (Hvap). If we are instead given the Hvap and the total heat of 1 kJ, we would divide 1 kJ by the Hvap (which is usually in kJ/kg) to get the mass of liquid boiled (in kg).
6 0
3 years ago
What is a balanced equation for the neutralization of these two compounds? <br><br> HCl <br> Ca(OH)2
loris [4]

In order to balance this, you have to count each element where the elements in the reactants side and the product side should have equal number of molecules. The balanced reaction is as follows:


2HCl + Ca(OH)2 = CaCl2 + 2H2O

8 0
2 years ago
What is the name for C2H3OH
Nuetrik [128]
Ethenol. Which has a molor mass of 44.05 g/mol
5 0
3 years ago
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