3 years ago

What is the only true way to tell if a chemical reaction has occurred? CFU

Chemistry

1 answer:

Murljashka [212]3 years ago

3 0

Answer:

change of colour

Explanation:

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What is the equation for the average?

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The equation for the average is: (sum of all data values/ (total number of data values)

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You are instructed to create 900. mL of a 0.29 M phosphate buffer with a pH of 7.8. You have phosphoric acid and the sodium salt

Aleksandr [31]

Answer:

B and C

Explanation:

When we have to do a buffer solution we always have to choose the reaction that has the pKa closer to the desired pH value. When we find the pKa values we will obtain:

$pKa_1=-Log[6.9x10^-^3]=2.16$

$pKa_2=-Log[6.2x10^-^8]=7.20$

$pKa_3=-Log[4.8x10^-^13]=12.31$

The closer value is pKa2 with a value of 7.2. Therefore we have to use the second reaction. In which $H_2PO_4^-^1$ is the acid and $HPO_4^-^2$ is the base. Therefore the answer for the first question is B and the answer for the second question is C.

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2 years ago

Calculate the molarity of 29.0g of ethanol (C2H5OH) in 545 mL of solution.

BigorU [14]

Molar mass ethanol:

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M = n / V

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hope this helps!

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The range in size of most atomic radii is approximately

dsp73

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Ghella [55]

potassium reacts the most vigorously.

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