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3 years ago

Which ion in the ground state has the same electron configuration as an atom of

Chemistry

1 answer:

Sergeu [11.5K]3 years ago

4 0

Answer:

Ca^+2

Explanation:

Hence, the correct option is A.

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Your body cells use the oxygen you breathe to get energy from the food you eat. This process is called cellular respiration. During cellular respiration the cell uses oxygen to break down sugar. Breaking down sugar produces the energy your body needs.

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3 years ago

Unscramble the following words to form a complete sentence about the cycles of nature:

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Answer: idk I have that question too , sorry to get ur hopes up high thinking this was an answer. PERIOTTTT

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3 years ago

A sample of gas has increased from 20 degrees Celsius to 22 degrees Celsius. Which of the following happens as the temperature o

Varvara68 [4.7K]

What is the "following"? You didn't list any choices.

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3 years ago

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I NEED HELP PLEASE, THANKS!

Crazy boy [7]

Answer:

Here's what I get.

Explanation:

1. Brønsted-Lowry theory

An acid is a substance that can donate a proton to another substance.

A base is a substance that can accept a proton from another substance.

2. pH of ammonia

The chemical equation is

$\rm NH$_{3}$ + \text{H}$_{2}$O \, \rightleftharpoons \,$ NH$_{4}^{+}$ + \text{OH}$^{-}$$

For simplicity, let's re-write this as

$\rm B + H$_{2}$O \, \rightleftharpoons\,$ BH$^{+}$ + OH$^{-}$$

(a) Set up an ICE table.

B + H₂O ⇌ BH⁺ + OH⁻

I/mol·L⁻¹: 0.335 0 0

C/mol·L⁻¹: -x +x +x

E/mol·L⁻¹: 0.335 + x x x

$\rm K_{\text{b}} = \dfrac{\text{[BH}^{+}]\text{[OH}^{-}]}{\text{[B]}} = 1.8 \times 10^{-5}\\\\\dfrac{x^{2}}{0.335 - x} = 1.8 \times 10^{-5}$

Check for negligibility:

$\dfrac{0.335}{1.8 \times 10^{-5}} = 28 000 > 400\\\\x \ll 0.335$

(b) Solve for [OH⁻]

$\dfrac{x^{2}}{0.335} = 1.8 \times 10^{-5}\\\\x^{2} = 0.335 \times 1.8 \times 10^{-5}\\x^{2} = 6.03 \times 10^{-6}\\x = \sqrt{6.03 \times 10^{-6}}\\x = \text{[OH]}^{-} = \mathbf{2.46 \times 10^{-3}} \textbf{ mol/L}$

(c) Calculate the pOH

$\text{pOH} = -\log \text{[OH}^{-}] = -\log(2.46 \times 10^{-3}) = 2.61$

(d) Calculate the pH

pH = 14.00 - pOH = 14.00 - 2.61 = 11.39

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4 years ago

2 reasons why scientific notation is useful.

viktelen [127]

Answer:

Often scientists work with a very large or very small number that contain a lot of zeros. Scientific notation allows these numbers to be written more compactly, and the information is more organized.

Explanation:

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3 years ago

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