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2 years ago

Which of the following powers the water cycle?

Chemistry

2 answers:

erastova [34]2 years ago

6 0

Answer:

C. Energy from the sun.

Explanation:

The heat from the sun causes the water to evaporate, which is the process that makes clouds, from wich rain comes from. Have a blessed day

inessss [21]2 years ago

4 0

The answer is C. Because you need the sun to start your cycle which starts with water evaporation

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The painkiller, Advil® contains the active ingredient ibuprofen (IB), which has a pKb of

denis23 [38]

This problem is providing the basic dissociation constant of ibuprofen (IB) as 5.20, its pH as 8.20 and is requiring the equilibrium concentration of the aforementioned drug by giving the chemical equation at equilibrium it takes place. The obtained result turned out to be D) 4.0 × 10−7 M, according to the following work:

First of all, we set up an equilibrium expression for the given chemical equation at equilibrium, in which water is omitted for it is liquid and just aqueous species are allowed to be included:

$Kb=\frac{[IBH^+][OH^-]}{[IB]}$

Next, we calculate the concentration of hydroxide ions and the Kb due to the fact that both the pH and pKb were given:

$pOH=14-8.20=5.80$

$[OH^-]=10^{-5.8}=1.585x10^{-6}M$

$Kb=10^{-5.20}=6.31x10^{-6}$

Then, since the concentration of these ions equal that of the conjugated acid of the ibuprofen (IBH⁺), we can plug in these and the Kb to obtain:

$6.31x10^{-6}=\frac{(1.585x10^{-6})(1.585x10^{-6})}{[IB]}$

Finally, we solve for the equilibrium concentration of ibuprofen:

$[IB]=\frac{(1.585x10^{-6})(1.585x10^{-6})}{6.31x10^{-6}}=4.0x10^{-7}$

Learn more:

(Weak base equilibrium calculation) brainly.com/question/9426156

4 0

3 years ago

Which group on the periodic table contains only metals?

Natalija [7]

Answer:

D. Along the bottom

5 0

3 years ago

Balance the following redox equation and identify the element oxidized, the element reduced, the oxidizing agent, and the reduci

earnstyle [38]

The charge of Br changed from –1 to 0, therefore it is the element which is oxidized. Since it is oxidized then Br is also the reducing agent.

The charge of Mn changed from +4 to +2 therefore it is the element which is reduced. Since Mn is reduced, then MnO2 is the oxidizing agent.

The half –reactions are:

Br: 2Br --> Br2 + 2e-

Mn: MnO2 --> Mn2+

First balance oxygen by adding H2O:

MnO2 --> Mn2+ + 2H2O

Then balance hydrogen by adding H+ ions:

4H+ + MnO2 --> Mn2 + 2H2O

Then the appropriate electrons:

4e- + 4H+ + MnO2 --> Mn2 + 2H2O

Multiply the half-reaction of Br by 2 because the half-reaction of Mn has 4 electrons.

4Br --> 2Br2 + 4e-

Combine the two half reactions and cancel common factors:

4Br- + 4H+ + MnO2 --> 2Br2 + Mn2 + 2H2O

6 0

3 years ago

What process occurs as pieces of dry ice get smaller

fenix001 [56]

Sublimation. It's basically, in simple terms, when a solid changes to a gas without going into liquid form.

8 0

3 years ago

Which body systems are responsible to transport materials around and out of the body?

Anni [7]

Answer:

Circulatory System

Explanation:

6 0

2 years ago