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3 years ago

9

Read the passage below and choose the best answer for the main idea of the passage:

1 answer:

Crank3 years ago

4 0

Answer: C

Explanation:

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Balance the following redox equation in acidic solution using the smallest integers possible and select the correct coefficient

romanna [79]

Answer:

Coefficient of $H^{+}(aq)$ is more than 4

Explanation:

Oxidation: $Sn^{2+}(aq)\rightarrow Sn^{4+}(aq)$

Balance charge: $Sn^{2+}(aq)-2e^{-}\rightarrow Sn^{4+}(aq)$ ......(1)

Reduction: $Cr_{2}O_{7}^{2-}(aq)\rightarrow Cr^{3+}(aq)$

Balance Cr: $Cr_{2}O_{7}^{2-}(aq)\rightarrow 2Cr^{3+}(aq)$
Balance O and H in acidic medium: $Cr_{2}O_{7}^{2-}(aq)+14H^{+}(aq)\rightarrow 2Cr^{3+}(aq)+7H_{2}O(l)$
Balance charge: $Cr_{2}O_{7}^{2-}(aq)+14H^{+}(aq)+6e^{-}\rightarrow 2Cr^{3+}(aq)+7H_{2}O(l)$ .......(2)

$[3\times Equation-(1)]+Equation(2)$ gives balanced equation:

$3Sn^{2+}(aq)+Cr_{2}O_{7}^{2-}(aq)+14H^{+}(aq)\rightarrow 3Sn^{4+}(aq)+2Cr^{3+}(aq)+7H_{2}O(l)$

So coefficient of $H^{+}(aq)$ is more than 4

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3 years ago

What's the electron configuration of an N⁻³ ion

tatuchka [14]

The electronic configuration of n - 3 ion is [He] 2s2 2p3.

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1 year ago

How does nectar provide energy for a humming bird

Greeley [361]

Nectar contains a high concentration of sucrose (sugar).

When hummingbirds ingest the nectar, their cells use oxygen to convert it into carbon dioxide and water.

The oxidation of sucrose releases a large amount of energy, which the birds can use for flapping their wings, etc.

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2 years ago

PLEASEEEEE PLEASEEEEE ANSWER THIS QUESTION ILL GIVE BRAINLIEST AND 15 POINTSSSSS plzzzz!!!!!

zalisa [80]

Answer:

D

Explanation:

A and B are completely wrong and C is partial but D is the best option

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2 years ago

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The boiling points of the elements helium, neon, argon, krypton, and xenon increase in that order. Which of the following statem

blagie [28]

Answer:

The boiling point of noble gas increases as you go down the group because the London dispersion forces increase.

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3 years ago