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11Alexandr11 [23.1K]
3 years ago
13

1. Which of the following substances are elements? Explain

Chemistry
1 answer:
GREYUIT [131]3 years ago
7 0
B, C, F, and G are all elements

How did I determine that answer? I looked at a periodic table.

Tin - Sn
Chromium - Cr
Arsenic - As
Nickel - Ni

Bronze is a copper alloy, not an element.
Solder is an alloy made of led or tin (sometimes brass or silver)
Propane is Alkane made up of Carbon and Hydrogen
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What is the pH of a solution with a 7.8 × 10−13 M hydronium ion concentration?
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Answer:

D. 12

Explanation:

The pH is a measure of the acidity of a solution. The pH indicates the concentration of hydronium ions [H3O +] present in a solution;

pH = - log [H3O+]

So

pH= - log [7.8 × 10−13 M]

finally

pH= 12

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In a chemical reaction, it is determined that the equilibrium constant is 0.213. Which of the following is a correct statement r
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2) If the constant of reacton for the forward reaction is greater than the constant of reaction for the reverse reaction, then the equilbrium constant is greater than 1 and the equilibrium is reached at a point where there are more products than reactants.

This is not the case given that the equilibrium constant is less than 1.

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