3 years ago

Which mineral is a nonsilicate? a. halite b. mica c. feldspar d. quartz?

Chemistry

1 answer:

kobusy [5.1K]3 years ago

6 0

The answer would be B. Mica.

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1. Which of the following statements is NOT true about double-replacement reactions?

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The pKa of formic acid is 3.75. At pH of 5.00, b) [formate] > [formic acid].

Formic acid is a weak acid. Thus, together with its conjugate base (formate) they form a buffer system. We can calculate the pH of a buffer system using Henderson-Hasselbach's equation.

$pH = pKa + log \frac{[formate]}{[formic\ acid]} \\\\5.00 = 3.75 + log \frac{[formate]}{[formic\ acid]}\\\\\frac{[formate]}{[formic\ acid]} = 17.8$

As expected, at a pH above the pKa, the concentration of formate is higher than that of the formic acid.

The pKa of formic acid is 3.75. At pH of 5.00, b) [formate] > [formic acid].

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How many grams are in 8.5 moles of lithium oxide?

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