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Salsk061 [2.6K]
3 years ago
15

12. Which of these is a solution? *

Chemistry
2 answers:
pav-90 [236]3 years ago
4 0
Gold is.........sndjfkfkdkkswk
Lera25 [3.4K]3 years ago
3 0

Answer:

carbonated water

remaining are single element

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The answer to the question is D
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3. If an ion contains 10 electrons,<br> 12 protons, and 13 neutrons, what is<br> the ion's charge?
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Answer:

The charge of the ion is 2+.

Explanation:

The amount of neutrons is extra information. You just need to compare the amount of electrons to the amount of protons for the ion's charge.

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Is h2so4 a Arrhenius acid
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Answer : Yes , H2SO4 is an arrhenius acid

<h2>Explanations : </h2>

• An ,Arrhenius acid ,is a substance that ,dissociates, in water to form ,hydrogen ions (H+).

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• In other words, an arrhenius acid increases the H+ ion concentration in aqueous solution.

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• This can be represented by the equation :

H_SO_4^{-\text{ }}\rightleftarrows H^{+\text{ }}+SO_4^{2-}

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The isotope 'Sr has a half-life of 28.8 years. What is the activity, measured in atoms/second, of a 50 mg sample of "Sr? (10 pts
sleet_krkn [62]

Answer:

The activity of 50mg of Sr is 2.63x10^{11} atoms/second

Explanation:

Every nuclear disintegration follows the first order rate, thus the half-life (t1/2) is t_{1/2} =\frac{Ln 2}{k} where k is the constant of the reaction.

<em>Considering 1 year equals 3.15x107 seconds</em>

\frac{28.8year x.3.15x10^{7}s }{1 year} = 9.072x10^{8} s

For Sr with t1/2 = 9.072x10^{8} s , the constant of the reaction is

k =\frac{Ln 2}{t_{1/2}}=\frac{Ln 2}{9.072x10^{8} s } = 7.64x10^{-10} s^{-1}

The activity (A) of a nucleus is A = k.N where N is the number of nucleus. Sr molecular mass is 87.6g/mol and every mol contains 6.023x1023 atoms, thus

\frac{50x10^{-3}g x 6.022x10^{23} atoms}{87.6g} = 3.44x10^{20} atoms

Therefore, the activity of 50mg of Sr is

A = k.N = 7.64x10^{-10} s^{-1} x 3.44x10^{20}atoms = 2.63x10^{11} atoms/second

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3 years ago
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