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masya89 [10]
3 years ago
7

What is the meaning of separation methods

Chemistry
1 answer:
Lena [83]3 years ago
8 0
Is the axt or process of moving aoart or forcing sonething apart
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Sand is converted to pure silicon in a three step process. the third step is sicl4(g) + 2mg(s) → 2mgcl2(s) + si(s) δh = –625.6 k
JulijaS [17]
The reaction is that,
1 mole is SiCL4 will produce 1 mole of Si(s) Since there is 1 to 1 relationship then we just multiply the enthalpy of reaction by the number of moles
Enthalpy = -625.5 kJ/mole × 12.5 Moles 
= -7,818.75 KJ
= -0.78 ×10⁴KJ
5 0
4 years ago
Read 2 more answers
Which is an example of chemical change?
Bess [88]

Answer:

<h3>Burning, cooking, rusting and rotting are examples of chemical changes.</h3>

4 0
3 years ago
Atoms that are sp2 hybridized form how many pi bonds?
vova2212 [387]
Sp2 hybridization forms 1 sigma bond and 1 pi bond.
3 0
4 years ago
If 50 ml of 0.235 M NaCl solution is diluted to 200.0 ml what is the concentration of the diluted solution
Helen [10]

This is a straightforward dilution calculation that can be done using the equation

M_1V_1=M_2V_2

where <em>M</em>₁ and <em>M</em>₂ are the initial and final (or undiluted and diluted) molar concentrations of the solution, respectively, and <em>V</em>₁ and <em>V</em>₂ are the initial and final (or undiluted and diluted) volumes of the solution, respectively.

Here, we have the initial concentration (<em>M</em>₁) and the initial (<em>V</em>₁) and final (<em>V</em>₂) volumes, and we want to find the final concentration (<em>M</em>₂), or the concentration of the solution after dilution. So, we can rearrange our equation to solve for <em>M</em>₂:

M_2=\frac{M_1V_1}{V_2}.

Substituting in our values, we get

\[M_2=\frac{\left ( 50 \text{ mL} \right )\left ( 0.235 \text{ M} \right )}{\left ( 200.0 \text{ mL} \right )}= 0.05875 \text{ M}\].

So the concentration of the diluted solution is 0.05875 M. You can round that value if necessary according to the appropriate number of sig figs. Note that we don't have to convert our volumes from mL to L since their conversion factors would cancel out anyway; what's important is the ratio of the volumes, which would be the same whether they're presented in milliliters or liters.

5 0
3 years ago
True or False: One example of a chemical reaction is when H20 (water) melts and changes state from ice to liquid.
Alexus [3.1K]

Answer:

False

Explanation:

Water melting from ice into a liquid is not a chemical reaction or chemical change. It is merely a phase change from solid to liquid.

4 0
3 years ago
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