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2 years ago

28. What is a surfactant? Explain how it works.

Chemistry

1 answer:

lidiya [134]2 years ago

7 0

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surfactant, also called surface-active agent, substance such as a detergent that, when added to a liquid, reduces its surface tension, thereby increasing its spreading and wetting properties.
In the dyeing of textiles, surfactants help the dye penetrate the fabric evenly.
They are used to disperse aqueous suspensions of insoluble dyes and perfumes.

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I'm stuck on this assignment, +20 PTS and BRAINLIEST for step by step:

dolphi86 [110]

Answer:

2. 2.74 L

3. 488 K

4. 7.47 L

5. 38.6 L

6. 2.85 mol

7. 319 K

8. 3.43 kPa

Explanation:

Generally speaking, you want to convert units to SI units, but in this case, we are working with ratios. This makes up for using the units that wouldn't appropriate elsewhere.

2. Use the equation P₁V₁ = P₂V₂. Solve for V₂.

(3.05 L)(870 kPa) = (969 kPa)(V₂)

V₂ = 2.74 L.

3. Use the equation V₁/T₁ = V₂/T₂. Solve for T₂.

(3.32 L)/(360 K) = (4.50 L)/(T₂)

T₂ = 488 K.

4. Do the same as above, but for V₂.

(5.10 L)/(-56°C) = V₂/(-82°C)

V₂ = 7.47 L

5. Use the equation V₁/n₁ = V₂/n₂. Solve for V₂.

(37.2 L)/(0.750 mol) = (V₂)/(0.778 mol)

V₂ = 38.6 L

6. Do the same as above, but for n₂.

(86.0 L)/(2.65 mol) = (92.5 L)(n₂)

n₂ = 2.85 mol

7. Use the equation P₁/T₁ = P₂/T₂. Solve for T₂.

(3.00 atm)/(390 K) = (2.45 atm)/(T₂)

T₂ = 319 K

8. Do the same as above, but for P₂.

In this specific case, however you will need to convert units. Since both temperatures don't have the same sign, the ratio won't come out right. Convert to Kelvin. Add 273.15 to the temperature in Celsius to convert to Kelvin -12.3°C = 260.85 K 25°C = 298.15 K.

(3.00 kPa)/(260.85 K) = P₂/(298.15 K)

P₂ = 3.43 kPa

There is a lot in here... If you are confused about something, let me know!

6 0

3 years ago

What energy change occurs during condensation? Please answer, i’ll give you brainliest !

kupik [55]

Answer:

Please see Explanation and Attachment (Heating Curve for Water)

Explanation:

Energy change associated with phase change in substances is either endothermic (energy added to system) or exothermic (energy removed from system). Condensation is but one term in six (6) describing phase change occurring when energy change is involved. The following table, in general, summarizes the related effects of energy change as applied to phase change.

Process Phase Change Energy Change*

Condensation gas => liquid Exothermic

Evaporation liquid => gas Endothermic

Freezing liquid => solid Exothermic

Melting solid => liquid Endothermic

Sublimation solid => gas Endothermic

Deposition gas => solid Exothermic

_____________________

* Energy Change terms:

Endothermic => Addition of heat energy

Exothermic => Removal of heat energy

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3 years ago

Who organized the periodic table?

Wittaler [7]

Dmitri Mendeleev was the creator and therefore organizer of the periodic table.

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3 years ago

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Could someone help me with this. i am very confused.

adell [148]

Answer:

same tho

Explanation:

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3 years ago

Burning a piece of wood in fire can be best described as a

castortr0y [4]

As a chemical change

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3 years ago