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Savatey [412]
3 years ago
10

During what part of the experiment is the hypothesis "judged" as being rejected or supported?

Chemistry
1 answer:
Blababa [14]3 years ago
5 0

Answer:

null

Explanation:

the hypothesis is a typical statistical theory which suggest that no statistical relationship and significance exists in a set of a given single observed variable between two sets of the observed data and measured phenomena

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Given the E0 values of the following two half-reactions: Zn  Zn2+ + 2e- E0 = 0.763 volt Fe  Fe2+ + 2e- E0 = 0.441 volt a) Writ
34kurt

<u>Answer:</u>

<u>For a:</u> The balanced chemical equation is written below.

<u>For b:</u> The corrosion of iron pipe will take place in the presence of zinc.

<u>For c:</u> Zinc will not protect iron pipe from corrosion.

<u>Explanation:</u>

  • <u>For a:</u>

The given half reaction follows:

The substance having highest positive E^o potential will always get reduced and will undergo reduction reaction. Here, zinc will undergo reduction reaction will get reduced.

<u>Oxidation half reaction:</u>  Zn\rightarrow Zn^{2+}+2e^-;E^o_{Zn^{2+}/Zn}=-0.763V

<u>Reduction half reaction:</u>  Fe+2e^-\rightarrow Fe;E^o_{Fe^{2+}/Fe}=-0.441V

The balanced chemical equation follows:

Fe+Zn^{2+}\rightarrow Fe^{2+}+Zn

  • <u>For b:</u>

For a reaction to be spontaneous (thermodynamically feasible) , the standard electrode potential must be positive.

To calculate the E^o_{cell} of the reaction, we use the equation:

E^o_{cell}=E^o_{cathode}-E^o_{anode}

Substance getting oxidized always act as anode and the one getting reduced always act as cathode.

Calculating the E^o_{cell} using above equation, we get:

E^o_{cell}=-0.441-(-0.763)=0.322V

As, the EMF is coming out to be positive, the reaction will be thermodynamically feasible and corrosion of iron pipe will take place in the presence of zinc.

  • <u>For c:</u>

As, the EMF of the cell is positive, the zinc will not protect the iron pipe from corrosion and the reaction will take place.

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3 years ago
Identify the parts of an experiment in the scenario below.
4vir4ik [10]
Constants is the answer sike bruh ion even know bout this
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3 years ago
Calculate the number of moles of sulfuric acid in the total volume you used in the lab (i.e., 8.00 mL). Hint: Use the methodolog
insens350 [35]

Answer:

0.147 mol

Explanation:

Step 1: Calculate the volumetric concentration (Cv)

We will use the following expression.

Cv = Cg × ρ

Cv = 98.0 g%g × 1.84 g/mL = 180 g%mL

Step 2: Calculate the molarity of sulfuric acid

We will use the following expression.

M = mass solute / molar mass solute × liters of solution

M = 180 g / 98.08 g/mol × 0.100 L = 18.4 M

Step 3: Calculate the moles of solute in 8.00 mL of solution

8.00 × 10⁻³ L × 18.4 mol/L = 0.147 mol

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Identify one trait in a plant that could be changed with selective breeding and explain how the change would be useful? Science.
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Which is a binary ionic compound?
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A binary ionic compound is composed of ions of two different elements - one of which is a metal, and the other a nonmetal.

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