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kenny6666 [7]
3 years ago
8

Use the E0 values of the following elements: Zn, Cu, Pb, and Al.

Chemistry
2 answers:
Radda [10]3 years ago
8 0

<u>Answer:</u> The correct answer is Option B.

<u>Explanation:</u>

E_o values are known as standard reduction potential values. More the positive reduction potential values, the metal will easily gain electron and will undergo reduction reaction easily.

The standard reduction potential values of the given metals are:

E_O_{(Zn)}=-0.7618V\\E_O_{(Cu)}=0.337V\\E_O_{(Pb)}=-0.126V\\E_O_{(Al)}=-1.662V

Copper has positive reduction potential than lead and thus, will undergo reduction reaction easily. It will gain electrons from other substance. So, the other substance will easily loose electrons and it will therefore oxidize.

Hence, the correct answer is Option B.

Sophie [7]3 years ago
3 0

B is the correct answer

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3 years ago
In order to gain one pound of body weight, the average person must consume 3500 more calories
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Answer:

<em>17500 calories</em> of chocolate bars are needed to eat to gain 5 pounds.

Explanation:

We can use ratios to calculate the answer using the information given in the question.

1 pound : 3500 grams

5 pounds : x grams

As it is given that the individual is burning no calories, we do not have to factor in any additional numbers.

<u><em>Method</em><em> </em><em>A</em><em>:</em></u>

To go from 1 in the first ratio to 5 in the second ratio, they multipled 1 by 5. Hence, to go from 3500 in the first ratio to x in the second ratio, we must multiply by 5.

x = 3500 × 5

x = 17500

<em><u>Method B</u>:</em>

To solve for the answer x, we can convert the ratios into fractions.

1 / 5 = 3500 / x

3500 / x = 1 / 5

To make x the subject, multiply the denominator of the left fraction with the numerator of the right fraction and place it on the left side. Then multiply the numerator of the left fraction with the denominator of the right fraction and place it on the right side.

x = 5 × 3500

x = 17500

4 0
4 years ago
A) 30.22 g NaCl x 1 mol NaC l =      58.4430 Molar mass (g) NaCl=0.5171 mol NaCl
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An important reaction that takes place in a blast furnace during the production of iron is the formation of iron metal and CO2 f
ladessa [460]

Answer: Mass of Fe_2O_3 required to form 930 kg of iron is 1328 kg

Explanation:

To calculate the number of moles, we use the equation:

\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}      .....(1)

For iron:

Given mass of iron = 930 kg = 930000 g  (1kg=1000g)

Molar mass of iron = 56 g/mol

Putting values in equation 1, we get:

\text{Moles of iron}=\frac{930000g}{56g/mol}=16607mol

The chemical equation for the  production of iron  follows:

Fe_2O_3+3CO\rightarrow 2Fe+3CO_2

By Stoichiometry of the reaction:

2 moles of iron are  produced by =  1 mole of Fe_2O_3

So, 16607 moles of iron will be produced by = \frac{1}{2}\times 16607=8303moles of Fe_2O_3

Now, calculating the mass of Fe_2O_3 from equation 1, we get:

Mass of Fe_2O_3 = moles\times {\text {molar mass}}=8303\times 160=1328480g=1328kg

Thus mass of Fe_2O_3 required to form 930 kg of iron is 1328 kg

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A complete soil profile includes three layers—
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It is topsoil, subsoil, and parent material
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