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igor_vitrenko [27]
3 years ago
14

I NEED HELP PLEASE, THANKS! :)

Chemistry
1 answer:
miss Akunina [59]3 years ago
8 0

Answer:

Elements in the same group in a periodic table have similar chemical properties.

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To a 25.00 mL volumetric flask, a lab technician adds a 0.250 g sample of a weak monoprotic acid, HA , and dilutes to the mark w
Basile [38]

Answer: The number of moles of the weak acid in the solution is 0.00396

Explanation:

To calculate the number of moles for given molarity, we use the equation:

\text{Molarity of the solution}=\frac{\text{Moles of solute}}{\text{Volume of solution (in L)}}      

a) {\text{Moles of}KOH=0.0846M\times 0.04683L=0.00396mol

The balanced chemical reaction is:

HA+KOH\rightarrow KA+H_2O  

1 mole of base uses = 1 mole of HA  

0.00396  moles of base use = \frac{1}{1}\times 0.00396=0.00396 moles of HA  

Thus the number of moles of the weak acid in the solution is 0.00396

6 0
3 years ago
What is the full meaning of DR.HERC.​
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Answer:

It is

D- <u><em>DEFINE</em></u> the problem

R-<em><u>RESEARCH</u></em> on the problem

H- Carry out a <u><em>HYPOTHESIS</em></u>

E- carry out an <em><u>EXPERIMENT</u></em>.

R-Analyse the <u><em>RESULT</em></u>

C-summarise the <u><em>CONCLUSION</em></u>.

Explanation:

Hope it helps.

5 0
3 years ago
Which of the following statements is/are true? For the false statements, correct them.
Lapatulllka [165]

Answer:

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4 0
3 years ago
Calcium carbonate, CaCO3(s), the principal compound in limestone, decomposes upon heating to CaO(s) and CO2(g). A sample of CaCO
lorasvet [3.4K]

Answer:

n = 0.01302 moles

Explanation:

Pressure = 1.3 atm

Temperature = 31 °C + 273 = 304 K ( Converting to kelvin temperature)

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Volume = 250 mL = 0.250 L

These quantities are related by the equation below;

PV = nRT

n = PV / RT

n = (1.3 * 0.250) / (0.0821 * 304)

n = 0.01302 moles

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3 years ago
What type of bond is formed between the oxygen atom of one water molecule and the hydrogen atom of another water molecule?
zysi [14]
The bond formed between oxygen atom of 1 water molecule with the hydrogen atom of another water molecule is called 'hydrogen bond'.
Hope this helps!

7 0
4 years ago
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