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3 years ago

A piece of silver is observed to be scratched bent and coated with tarnish. which is the chemical change?

2 answers:

8 0

Answer:

The answer is D

Explanation:
Tarnish allows silver to lose its sheen. A is a physical change because it’s only bending it. Get scratched does not change its chemical properties.

Tomtit [17]3 years ago

4 0

Answer:

The answer is D.

Explanation:

Silver consists of 92.5% silver, and the remaining part is copper. ... Pure silver is not susceptible to tarnish in a pure oxygen environment. However, the copper that is contained in 925 sterling silver may react to the ozone and hydrogen sulfide in the air and cause sterling silver to tarnish.

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anyanavicka [17]

Answer:

Explanation:

7 0

3 years ago

Calculate the pH of a 0.50 M HIO. The Ka of hypoiodic acid, HIO, is 2.3x10–11.0.305.325.479.474.80

never [62]

Answer:

pH = 5.47

Explanation:

The equilibrium that takes place is:

HIO ↔ H⁺ + IO⁻

Ka = $\frac{[H+][IO-]}{[HIO]}$ = 2.3 * 10⁻¹¹

At equilibrium:

[HIO] = 0.5 M - x

[H⁺] = x

[IO⁻] = x

<u>Replacing those values in the equation for Ka and solving for x:</u>

$Ka=\frac{x^2}{0.5-x}=2.3*10^{-11} \\x^2=(2.3*10^{-11})(0.5-x)\\x^2=1.15*10^{-11}-2.3*10^{-11}x\\x^2+2.3*10^{-11}x-1.15*10^{-11}=0\\x=3.39*10^{-6}$

Then [H⁺]=3.39 * 10⁻⁶, thus pH = 5.47

7 0

3 years ago

Which of the following is the correct formula for sulfuric acld?

Alona [7]

Explanation:

The answer is H2SO4 for sulphuric acid

6 0

3 years ago

In an extraction procedure, it is advisable to: save all layers until the experiment is complete. throw away all layers as soon

LenKa [72]

All the layers should be kept until the experiment is complete.

<h3>What is extraction?</h3>

In chemistry, solvent extraction is accomplished by adding a sample containing the substance to be separated into a system of two solvents, an aqueous layer and an organic layer.

It is important to note that all the layers should be kept until the experiment is complete. No layer ought to be discarded before the work is completed.

Learn more about solvent extraction:brainly.com/question/11041092

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2 years ago

What is true about ionic compounds?

bezimeni [28]

It’s D I am pretty sure.

6 0

3 years ago