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Vikki [24]
3 years ago
12

Identify each of the following reactions as balanced or unbalanced. CH4+ 2O2 → CO2 + 2H2O: CaCl2+ 2AgNO3 → Ca(NO3)2 + 2AgCl: 3Fe

3O4 + 4Al → 9Fe + 4Al2O3:
Chemistry
2 answers:
kap26 [50]3 years ago
8 0

1) The answer is: chemical reaction is balanced.

Chemical reaction: CH₄ + O₂ → CO₂ + H₂O.

Oxidation reaction: C⁻⁴ → C⁺⁴ + 8e⁻.

Reduction reaction: O₂ + 4e⁻ → 2O⁻² /×2; 2O₂ + 8e⁻ → 4O⁻².

Balanced chemical reaction: CH₄ + 2O₂ → CO₂ + 2H₂O.

Carbon change oxidation number from -4 to +4 (oxidation) and oxygen change oxidation number from 0 to -2 (reduction).

2) The answer is: chemical reaction is balanced.

Balanced chemical reaction: CaCl₂ + 2AgNO₃ → Ca(NO₃)₂ + 2AgCl.

Number of atoms must be the same on left and right side of balanced chemical reaction according to the law of conservation of mass or principle of mass conservation.

There are two chlorine atoms (Cl), one calcium atom (Ca), six oxygen atoms (O), one nitrogen atoms (N) and two silver atoms (Ag) in this balanced chemical reaction.

3) The answer is: chemical reaction is unbalanced.

Chemical reaction: 3Fe₃O₄ + 4Al → 9Fe + 4Al₂O₃.

Number of aluminium atoms (Al) is unbalanced. There are four aluminium atoms on the left and eight aluminium atoms on right side of chemical reaction.

Balanced chemical reaction: 3Fe₃O₄ + 8Al → 9Fe + 4Al₂O₃.

According to principle of mass conservation, number of atoms must be equal on both side of chemical reaction.

ICE Princess25 [194]3 years ago
4 0

1) The answer is: chemical reaction is balanced.

2) The answer is: chemical reaction is balanced.

3) The answer is: chemical reaction is unbalanced.

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The answer is High altitude
5 0
3 years ago
Phosphorous would gain or lose electrons?
devlian [24]

Answer: the valence electron for phosphorus is 5. To achieve an octet electron arrangement, it needs to lose 5 electrons or gain 3 electrons. It is easier to gain 3 electrons than to lose 5 electrons. So phosphorus has to gain 3 electrons.

Explanation:

Hope it helps sorry if it doesn't

4 0
3 years ago
8. Consider the element Scandium, atomic # 21.
yawa3891 [41]

Explanation:

Scandium has atomic number of 21. This means that in it's neutral state its going to have 21 electrons.

a) The full electronic configuration is given as;

1s2 2s2 2p6 3s2 3p6 3d1 4s2

The final electron is placed in the d orbital. The shell is 3d

(b) When scandium has a charge if +1, it has lost an electron. The total number of electrons would now be 21-1 = 20

The electronic configuration would be given as;

1s2 2s2 2p6 3s2 3p6 4s2

The electron in the 3d orbital would be removed.

4 0
3 years ago
(Link; https://www.chemteam.info/SigFigs/SigFigsFable.html)
Anna007 [38]

1. The measurement turned out to be so expensive since the student did not rely on the significant figures to calculate the edge of the cube and approximate it to the next value (2.1 cm possibly) that would allow a simpler construction and therefore its cost was much lower .

2. The student had to take all the significant figures in his calculations, with which he would have:

Volume = \frac{mass}{density}

Volume = \frac{80g}{8.67g/mL}

Volume = 9.2272203 mL

Since the figure to be constructed is a cube, he had to calculate the cube root of the volume to find the value of the edge of the cube:

Edge of the cube = \sqrt[3]{9.2272203 cm^{3} } (Taking into account that cm^{3} is proportional to mL)

Edge of the cube = 2.097443624 cm

Because the cube edge value is so specific, in order to manage his budget, he was able to order a 2.1 cm cube, which would bring the mass up to 80.29287 g, and in the lab reduce one of the faces to the appropriate weight. .

On the other hand, the main thing he had to do was ask how much it would cost to make a cube with those specifications, especially when they mentioned that it would be "expensive" and he only had $50.

The significant figures guarantee the correct operation of a machinery, a gear, a team in general, for which the accuracy will not only be taken to the millimeter, but sometimes microns or much more specific, as in the case of computer components, Therefore, it is very important, if not, and if arbitrary measurements are taken that do not consider significant figures, the components could not function properly, which would cause a loss in time, effort and manpower.

If you want to learn more about exercises with significant figures, you can see the next link: brainly.com/question/11904364?referrer=searchResults

4 0
2 years ago
How many moles are in a solution that has a molarity of 3.0M and a volume of 1500 ml.
Bad White [126]

Answer:

1.25 Moles

Explanation:

1.25 moles of solute

Explanation:

Molarity is defined as the number of moles of solute per liter of solution.

Molarity = moles of solute / liter of solution

We are given the molarity and volume, both of which have the correct units. All we have to do is rearrange the equation to find the number of moles. You can do this by multiplying both sides of the equation by the volume to cancel it out on the right hand side. Afterwards, you should end up having the volume multiplied by the molarity equaling the number of moles of solute like so:

Moles of solute = Molarity * Volume

2.5M HCl * 0.5 L = 1.25 moles of HCl

I hope this made sense.

3 0
3 years ago
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