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3 years ago

How does geothermal energy differ from solar energy?

Chemistry

1 answer:

miss Akunina [59]3 years ago

8 0

Answer:

Solar panels capture the sun's rays and convert it into heat and electricity, which is used to heat and cool your home, while geothermal solutions use the constant core temperature of the Earth to warm and cool a property.

Explanation:

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Find the number of moles in 3.30 g of (NH4)2SO4?

Vesnalui [34]

Hey there!

Molar mass ( NH4)2SO4 = 132.1395 g/mol

So:

1 mole ( NH4)2SO4 ---------------- 132.1395 g

moles (NH4)2SO4 ----------------- 3.30 g

moles (NH4)2SO4 = 3.30 * 1 / 132.1395

moles (NH4)2SO4 = 3.30 / 132.1395

=> 0.0250 moles of (NH4)2SO4

Answer A

Hope that helps!

7 0

3 years ago

Read 2 more answers

What are the factors that affect the rate of dissolution?

Liula [17]

Option (C) is the correct answer.

When solute is added to the solvent, results in the formation of solution and the process is said to be dissolution.

Dissolution process depends upon the three factors: temperature, stirring and surface area.

Stirring increases the rate of dissolving as when stirring a solute in the solvent, stirring helps in the distribution of solute throughout the solvent which results in speed up the dissolving rate.

Dissolution also depends upon the temperature, in warm solvent, solute dissolves readily whereas in cool solvent, solute dissolves slowly as particles have more movement energy.

Greater the surface area, there will be more contact between the solute particles and solvent particles which increases the rate of dissolving. Smaller the surface are, there will be less contact between the particles which decreases the rate of dissolving. For example: granulated sugar dissolves more readily due to larger surface area and one ice cube dissolves slowly due to smaller surface area.

Hence, rate of dissolution depends upon temperature, stirring, surface area.

4 0

3 years ago

Methods: Part A: Preparation of Buffers Make two buffers starting with solid material, which is the most common way to make buff

Alecsey [184]

Answer:

0,542 g of Na₂HPO₄ and 0,741 g of NaH₂PO₄.

0,856 g of Tris-HCl and 0,553 g of Tris-base

Explanation:

It is possible to use Henderson–Hasselbalch equation to estimate pH in a buffer solution:

pH = pka + log₁₀ $\frac{A^{-} }{HA}$

Where A⁻ is conjugate base and HA is conjugate acid

The equilibrium of phosphate buffer is:

H₂PO₄⁻ ⇄ HPO4²⁻ + H⁺ Kₐ₂ = 6,20x10⁻⁸; pka=7,21

Thus, Henderson–Hasselbalch equation for phosphate buffer is:

pH = 7,21 + log₁₀ $\frac{HPO4^{2-} }{H2PO4^{-} }$

If desire pH is 7,0 you will obtain:

0,617 = $\frac{HPO4^{2-} }{H2PO4^{-} }$ (1)

Then, if desire concentration of buffers is 0,10 M:

0,10 M = [HPO₄²⁻] + [H₂PO₄⁻] (2)

Replacing (1) in (2) you will obtain:

[H₂PO₄⁻] = 0,0618 M

And with this value:

[HPO₄²⁻] = 0,0382 M

As desire volume is 100mL -0,1L- the weight of both Na₂HPO₄ and NaH₂PO₄ is:

Na₂HPO₄ = 0,1 L× $\frac{0,0382mol}{1L}$ × $\frac{141,96g}{1mol}$ = 0,542 g of Na₂HPO₄

NaH₂PO₄ = 0,1 L× $\frac{0,0618mol}{1L}$ × $\frac{119,96g}{1mol}$ = 0,741 g of NaH₂PO₄

For tris buffer the equilibrium is:

Tris-base + H⁺ ⇄ Tris-H⁺ pka = 8,075

Henderson–Hasselbalch equation for tris buffer is:

pH = 8,075 + log₁₀ $\frac{Tris-base }{Tris-H^{+} }$

If desire pH is 8,0 you will obtain:

0,841 = $\frac{Tris-base }{TrisH^{+} }$ (3)

Then, if desire concentration of buffers is 0,10 M:

0,10 M = [Tris-base] + [Tris-H⁺] (4)

Replacing (3) in (4) you will obtain:

[Tris-HCl] = 0,0543 M

[Tris-base] = 0,0457 M

As desire volume is 100mL -0,1L- the weight of both Tris-base and Tris-HCl is:

Tris-base = 0,1 L× $\frac{0,0457mol}{1L}$ × $\frac{121,1g}{1mol}$ = 0,553 g of Tris-base

Tris-HCl = 0,1 L× $\frac{0,0543mol}{1L}$ × $\frac{157,6g}{1mol}$ = 0,856 g of Tris-HCl

I hope it helps!

8 0

3 years ago

Write 0.000000093425 in Scientific Notation with 4 significant figures.

Romashka-Z-Leto [24]

Answer: The given number in scientific notation is $9.342\times 10^{-8}$

Explanation:

Scientific notation is the notation where a number is expressed in the decimal form. This means that the number is always written in the power of 10 form. The numerical digit lies between 0.1.... to 9.9.....

If the decimal is shifting to right side, the power of 10 is negative and if the decimal is shifting to left side, the power of 10 is positive.

We are given:

A number having value = 0.000000093425

Converting this into scientific notation, we get:

$\Rightarrow 0.000000093425=9.342\times 10^{-8}$

Hence, the given number in scientific notation is $9.342\times 10^{-8}$

6 0

4 years ago

Read 2 more answers

In a solution, the solvent In a solution, the solvent can be a liquid or gas. A. is the substance present in the smallest concen

Readme [11.4K]

Answer:

Can either be a solid, a liquid or a gas

Explanation:

A solvent can either be a solid, liquid or a gas. It is the carrier medium in a solution. It is the one in which the solute is dissolved.

Although quite unusual, a solvent might also be a solid. An important application of this can be seen in the production of alloys. Alloys are mixture of metals. To produce let’s say an alloy containing just two metals, the use of a solid solvent is needed. Here, one of the two metals is known as the base metal. It is this base metal that will serve as the carrier medium for the other metal

6 0

3 years ago