Answer:
7.08
Explanation:
First, we need to write a balanced dissociation equation equation for HCl. This is illustrated below:
HCl <==> H+ + Cl-
Now, we see clearly that 1mole of HCl produced 1mole of H+. This means that 8.4x10^-8M HCl will also produce 8.4x10^-8 M H+
Now, we can obtain the pH as follows:
[H+] = 8.4x10^-8 M
pH = —Log [H+]
pH = —Log 8.4x10^-8
pH = 7.08
Answer:
Approximately 0.39 g or 0.4 g if you're rounding up
Explanation:
15/3.82 = 3.92
Let's round that up to 4
That means 15 days is around 4 half lives
4 half lives means 1/16 of the original mass will be left
25/16 = 0.390625
The best answer is no bc the question ask "Would the two as yet undiscovered element A+1 and D+2" don't sound right
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Copper substance cannot be decomposed by a chemical change.
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- When heated, the copper to carbonate breaks down into copper to oxide. The copper carbonate, which is dark in colour, releases carbon dioxide as well.Because they are the simplest chemically, elements cannot be broken down by chemical processes.
- Elements are those pure compounds that cannot be broken down by reactions, heating, electrolysis, or other common chemical processes. Examples of elements are oxygen, gold, and silver. Its makeup stays the same, though. One instance of a physical change is melting. A physical change is when a sample of matter experiences a change in some of its qualities but not in its identity. Water turns into water vapour when it is heated.
Learn more about copper here:
brainly.com/question/493292
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