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Leni [432]
2 years ago
13

Which of the following describes the greenhouse effect?

Chemistry
2 answers:
ankoles [38]2 years ago
6 0

Earth's greenhouse gases trap heat in the atmosphere and warm the planet.

Sergeeva-Olga [200]2 years ago
4 0

Answer:

The answer to this problem is D.

Explanation:

Firstly, light from the sun passes through Earth's atmosphere to reach Earth's surface and heat the planet. However, some of this light is radiated back into space in the form of infrared radiation. This radiation is trapped by Earth's greenhouse gases in the atmosphere, causing Earth's surface to heat up. For this reason, choice D makes the most sense.

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If 1.02 g of nickel reacted with 750. mL of 0.112 M hydrobromic acid, how much of each will be present at the end of the reactio
kati45 [8]

Answer:

35.1% is percent yield

Explanation:

<em>Full question: Assume no volume change.  If you formed 0.0910 atm of gas, what is the percent yield?</em>

<em />

The reaction that is occurring is:

Ni + 3HBr → NiBr₃ + 3/2H₂(g)

First, we will determine moles of Ni and HBr to determine limiting reactant and theoretical yield

Using ideal gas law, we can determine the moles of hydrogen formed. Thus, we can find percent yield:

<em>Moles Ni (Molar mass: 58.69g/mol):</em>

1.02g * (1mol / 58.69g) = 0.01738moles Ni

<em>Moles HBr:</em>

0.750L * (0.112mol/L) = 0.084 moles of HBr.

For a complete reaction of the 0.084 moles of HBr you need:

0.084mol HBr * (1 mole Ni / 3 moles HBr) = 0.028 moles of Ni.

As there are just 0.01738 moles of Ni, the Ni is limiting reactant. Assuming a theoretical yield, moles of H₂ produced are:

0.01738moles Ni * (3/2 H₂ / 1 mol Ni) = 0.02607 moles H₂

Now, moles of H₂ produced are:

PV = nRT

PV/RT = n

<em>Where P is pressure (0.0910atm)</em>

<em>V is volume (2.50L)</em>

<em>R is gas constant (0.082atmL/molK)</em>

<em>T is absolute temperature in Kelvin (30°C + 273.15 = 303.15K)</em>

<em>And n are moles</em>

PV/RT = n

0.0910atm*2.50L/0.082atmL/molK*303.15K = n

0.00915 moles = n

<em />

And percent yield (Produced moles / Theoretical moles * 100) is:

0.00915 moles / 0.02607moles =

<h3>35.1% is percent yield</h3>
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2 years ago
Last question, I promise!!!!!! ... :&gt;
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Answer:

Which question?

Explanation:

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State two differences between physical change and chemical change
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Answer:

See explanation

Explanation:

1) Physical change is usually reversible, while chemical change isn't

2) Chemical change involves the change of chemical composition of matter while physical change doesn't

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An investigation that is controlled
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A controlled variable 
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A student combines 34 grams of one chemical and an unknown amount of another chemical in a closed system. A chemical reaction oc
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Step by step:

116-34=82
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