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frosja888 [35]
2 years ago
5

Directions: Use the words in the word box to complete the following sentences.

Chemistry
2 answers:
bixtya [17]2 years ago
6 0

Answer:

if u answer my today's a pic quatiom I will give u ur any questions

mr_godi [17]2 years ago
6 0

Answer:

balanced

resistance

gravity

counteract

acceleration

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If you had 1.50 g of ZnSO4.7H20, zinc sulfate septahydrate, how many grams of water will there be?
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There will be 1.50 gram of water

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Chemical bonds are likely to form when_____
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Answer: When the electrons in an element are more than the required, a bond is formed with other element which has deficiency of electron and in case when electrons are less in numbers the vice versa happens. Such kind of chemical bonds are known as ionic bond.

Explanation:

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A chemist must prepare 800.0mL of sodium hydroxide solution with a pH of 12.10 at 25°C. She will do this in three steps: Fill a
AnnZ [28]

Answer:

0.42 g

Explanation:

<u>We have: </u>

pH = 12.10 (25 °C)

V = 800.0 mL = 0.800 L    

To find the mass of sodium hydroxide (NaOH) we can use the pH:

14 = pH + pOH

pOH = 14 - pH = 14 - 12.10 = 1.90

pOH = -log ([OH^{-}])

[OH]^{-} = 10^{-pOH} = 10^{-1.90} = 0.013 M

Now, we can find the number of moles (η) of OH:

\eta = ([OH]^{-})*V = 0.013 mol/L * 0.800 L = 1.04 \cdot 10^{-2} moles

Since we have 1 mol of OH in 1 mol of NaOH, the number of moles of NaOH is equal to 1.04x10⁻² moles.

Finally, with the number of moles we can find the mass of NaOH:

m = \eta * M

<em>Where M is the molar mass of NaOH = 39.9 g/mol </em>

m = 1.04 \cdot 10^{-2} moles * 39.9 g/mol = 0.42 g

Therefore, the mass of sodium hydroxide that the chemist must weigh out in the second step is 0.42 g.

I hope it helps you!

3 0
3 years ago
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