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defon
3 years ago
5

Which lava composition causes the most volcanic eruptions? Why?

Chemistry
1 answer:
ddd [48]3 years ago
5 0

Answer:

Explosive eruptions are favored by high gas content & high viscosity magmas (andesitic to rhyolitic magmas). The explosive bursting of bubbles fragments the magma into clots of liquid that cool as they fall through the air. These solid particles become pyroclasts or volcanic ash.

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If a 0.610 m aqueous solution freezes at –3.00 °c, what is the van\'t hoff factor, i, of the solute? kf values can be found here
LiRa [457]
ΔT = 3°C = 3 K.
Kf(H₂O) = 1,853 K<span>·kg/mol.
</span><span>b = 0,610 m = 0,610 mol/kg.
b = n </span>÷ m(H₂O).
ΔT = Kf · b · i.
i = ΔT / Kf · b.
i = 3 K / 1,853 K·kg/mol · 0,610 mol/kg.
i = 2,65.
i - <span>Van 't Hoff factor.
b - molality.
</span>ΔT - change in temperature.<span>

</span>
3 0
4 years ago
I have a buddy who recycles electronics, and isolates metals from the connector pins electrical boards. He isolates gold, for ex
bogdanovich [222]

Solution :

In the process to isolate gold that has a 80 percent yield, a 3.00 g of Au is being isolated.

That is, the actual yield of Au is 3. 00 g

Therefore, we need to find the theoretical yield.

As we know,

$\text{percent yield}=\frac{\text{actual yield}}{\text{theoretical yield}} \times 100$

$\text{theoretical yield}=\frac{\text{actual yield}}{\text{present yield}} \times 100$

As actual yield = 3.00 g

    percent yield = 80 %

So, theoretical yield = $\frac{3.00}{80} \times 100$

                                  = 3.75 g

Thus he should be able to get 3.75 g which is the theoretical yield of Au.

5 0
3 years ago
Please help! What is the molarity of 450 mL of solution containing 15 g NaCl?
siniylev [52]

Answer:

The answer to your question is 0.6 M

Explanation:

Data

Molarity = ?

Volume = 450 ml

mass of NaCl = 15 g

Process

1.- Calculate the molar mass of NaCl

NaCl = 23 + 35.5 = 58.5 g

2.- Calculate the number of moles of NaCl

             58.5 g of NaCl ------------ 1mol

                 15 g of NaCl ------------   x

                         x = (15 x 1)/58.5

                         x = 0.26 moles

3.- Calculate the molarity

Molarity = moles/volume

-Substitutiion

Molarity = 0.26/0.45l

-Result

Molarity = 0.6 M

7 0
4 years ago
What were the results on Rutherford's goldfoil experiment
diamong [38]

Answer:

Explanation:

The relative massive alpha particles could go through the gold foil without being deviated of their trajectory or only small deviations due to the uniformity distribution positive charge of the protons.

4 0
4 years ago
What process is the foundation of almost all food webs
Sergeeva-Olga [200]

Answer:

The Sun is the major source of energy for organisms and the ecosystems of which they are a part. Producers such as plants, algae, and cyanobacteria use the energy from sunlight to make organic matter from carbon dioxide and water. This establishes the beginning of energy flow through almost all food webs

3 0
3 years ago
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