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3 years ago

Ella makes this table to organize her notes on whether atoms gain or lose energy during the changes of state.

Chemistry

2 answers:

Sauron [17]3 years ago

5 0

Answer:

Explanation:

I took the test

Gre4nikov [31]3 years ago

4 0

Answer:

D took the test

Explanation:

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The energy level where an electron is located, is shown by the ______ on the periodic table

Norma-Jean [14]

Answer:

the first energy level is closest to nuclear the second energy level is a little farther away than the first

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3 years ago

What is the percent by mass of oxygen in carbon dioxide (CO2)?

wariber [46]

Answer:

= 72.73%

Explanation:

The percentage by mass of an element is given by;

% element = total mass of element in compounds/molar mass of compound × 100

The mass of oxygen in carbon dioxide = 32 g

Molar mass of CO2 = 44 g

Therefore;

% of O2 = 32/44 × 100%

<u>= 72.73%</u>

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3 years ago

What does the symbol "E3" represent?

Anna71 [15]

Answer:

your answer to your question is B

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3 years ago

Read 2 more answers

What is the solubility of MgCO₃ in a solution that contains 0.080 M Mg²⁺ ions? (Ksp of MgCO₃ is 3.5 × 10⁻⁸)

Alchen [17]

Answer: 4.4 x 10^-7

Explanation:

The dissociation equation for this reaction is:

MgCO3 (s) → Mg+2 (aq) + CO3-2 (aq)

$\text { So, } k_{s p}=(x+0.08) x$ (Here 0.08 >>> x )

$\begin{aligned}\Rightarrow 3.5 \times 10^{-8} &=0.08 \times x \\\Rightarrow x &=\frac{3.5}{0.08} \times 10^{-8} \\&=4.37 \times 10^{-7} \\\Rightarrow x & \approx 4.4 \times 10^{-7} \mathrm{~M}\end{aligned}$

So the solubility MgCO₃ in a solution that containing 0.080 M Mg²⁺ is 4.4 x 10^-7

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2 years ago

6.3x10-5M. What is the pH?

BabaBlast [244]

Answer:

https://sensorex.com/ph-calculator/

Explanation:

go to this link and then scroll down a little bit and then you'll find the answer

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2 years ago