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Alex17521 [72]
3 years ago
15

What is this people i do not understand this because I try and don't know what it is

Chemistry
2 answers:
enot [183]3 years ago
6 0
I think it is conduction
andreyandreev [35.5K]3 years ago
5 0

Answer:

radiation

Explanation:

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If 354.2g PbCl2 are reacted with excess Na3PO4, how many grams of NaCl will be produced
Illusion [34]

Answer: The mass of NaCl produced is, 149 grams.

Explanation : Given,

Mass of PbCl_2 = 354.2 g

Molar mass of PbCl_2 = 278 g/mol

Molar mass of NaCl = 58.5 g/mol

First we have to calculate the moles of PbCl_2

\text{Moles of }PbCl_2=\frac{\text{Given mass }PbCl_2}{\text{Molar mass }PbCl_2}

\text{Moles of }PbCl_2=\frac{354.2g}{278g/mol}=1.27mol

Now we have to calculate the moles of CaCl_2

The balanced chemical equation is:

3PbCl_2+2Na_3PO_4\rightarrow 6NaCl+Pb_3(PO_4)_2

From the reaction, we conclude that

As, 3 moles of PbCl_2 react to give 6 mole of NaCl

So, 1.27 moles of PbCl_2 react to give \frac{6}{3}\times 1.27=2.54 mole of NaCl

Now we have to calculate the mass of NaCl

\text{ Mass of }NaCl=\text{ Moles of }NaCl\times \text{ Molar mass of }NaCl

\text{ Mass of }NaCl=(2.54moles)\times (58.5g/mole)=148.59g\approx 149g

Therefore, the mass of NaCl produced is, 149 grams.

3 0
3 years ago
Which of the following best describes the motion of the particles in a piece of steel?
sergejj [24]
<span>Steel is a solid at standard temperature and pressure conditions. For a solid, the particles are found to be oscillating about a fixed point. However, steel is a metal so this holds true for the positively charged nuclei of the particles. Just like any other metal, the electrons are free to move about, allowing steel to exhibit its properties such as heat conduction and electricity conduction. The reason the positive particles are fixed in place is because the intermolecular forces are very strong in solids, the strongest out solids, liquids and gases.</span>
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Answer:

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Explanation:

Mitochondria are organelles whose membranes are specialized for aerobic respiration.

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The equation, DF + heat Imported Asset D + F, is an example of an endothermic reaction.
zvonat [6]
The answer is TRUE.

If the Energy is on the left, then the problem is true. If it is on the right then it would be negative, false, and considered as exothermic.

Endothermic reaction = the products are higher in energy than the reactants.
Exothermic reaction = a chemical reaction that releases energy by light or heat.
4 0
3 years ago
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Why are xrays used to probe the crystal structure of a material
ioda

Answer:

Because X-rays have wavelengths similar to the size of atoms

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