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3 years ago

Which gas is most abundant in Earth’s atmosphere?

Chemistry

2 answers:

natima [27]3 years ago

4 0

Answer:

nitrogen

Explanation:

The atmosphere contains many gases, most in small amounts, including some pollutants and greenhouse gases. The most abundant gas in the atmosphere is nitrogen, with oxygen second. Argon, an inert gas, is the third most abundant gas in the atmosphere. Why do I care?

Sindrei [870]3 years ago

4 0

nitrogen is the most abundant gas in the atmosphere

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Which type of animal can breed on their own but have undergone physiological or behavioral changes due to captivity?

Julli [10]

B as part of human pushed natural selection

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3 years ago

HELPPP The sum of percentage compositions must equal to 100 ±0.1. True False

Diano4ka-milaya [45]

Answer:

True

Explanation:

3 0

4 years ago

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For a chemical reaction to be non-spontaneous at any temperature, which of the following conditions must be met?

stiv31 [10]

Answer:

Hi, the given question has some missing part. Complete question is: " For a chemical reaction to be non-spontaneous at any temperature, which of the following conditions must be met?

A. ΔS° > 0, ΔH° > 0

B. ΔS° > 0, ΔH° < 0

C. ΔS° < 0, ΔH° < 0

D. ΔS° < 0, ΔH° > 0

E. All reactions are spontaneous at some temperature."

Option (D) is correct.

Explanation:

We know that, $\Delta G^{0}=\Delta H^{0}-T\Delta S^{0}$

Where T represents temperature in kelvin scale. Hence it is always positive.

For a non-spontaneous reaction, $\Delta G^{0}$ should be positive.

If $\Delta S^{0}< 0$ then $-T\Delta S^{0}> 0$ at any T value.

Hence $\Delta G^{0}> 0$ for any value of T if both $\Delta H^{0}$ and $-T\Delta S^{0}$ are greater than zero.

So, option (D) is correct.

5 0

3 years ago

Intermolecular forces allow which of the following substances to be the least fluid?

slava [35]

Out of the options, glass is the least fluid. The proof of this also lies in the fact that glass is the most difficult to melt out of all of the mentioned substances, and melting point gives us a rough estimate of the strength of intermolecular forces.

3 0

4 years ago

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Indicate whether each of the following compounds will gave an acidic, basic or neutral solution when dissolved in water. Clear A

allsm [11]

Answer: ammonium bromide : acidic : The pH will be less than 7.

potassium cyanide : basic :The pH will be more than 7.

calcium nitrate: neutral : The pH will be approximately equal to 7.

calcium hypochlorite : basic :The pH will be more than 7.

Explanation:

pH is defined as the negative logarithm of hydrogen ion concentration. The scale ranges from 0 to 14.

When a solution is acidic, it will show a pH in the range of 0 - 6.9. When a solution is basic, it will show a pH in the range of 7.1 - 14. When a solution is neutral, it will show a pH of 7.

ammonium bromide : $NH_4Br$ : acidic as it is formed from the combination of strong acid HBr and weak base $NH_4OH$

potassium cyanide : $KCN$ : basic, as it is formed from the combination of weak acid HCN and strong base KOH

calcium nitrate: $Ca(NO_3)_2$ : neutral, as it is formed from the combination of strong acid and strong base.

calcium hypochlorite : $Ca(ClO)_2$ : basic, as it is formed from the combination of weak acid $HOCl$ and strong base $Ca(OH)_2$

3 0

4 years ago