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katrin [286]
3 years ago
8

What kind of lens does a nearsighted person need

Chemistry
2 answers:
love history [14]3 years ago
5 0
Near/shortsighted people need concave lenses. I myself am nearsighted
Troyanec [42]3 years ago
5 0

I know I am 5 years late but the answer is concave lens

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#5.) Explain why the rock cycle is referred to as a "cycle".
Natalka [10]
The rock cycle is referred to as cycle because it repeats over and over again. The definition of cycle is a series of events that are regularly related in the same order. So with the rock cycle they stay in the same order and repeat.
Hope this helps :)
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3 years ago
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An ore is to be analyzed for its iron content by an oxidation-reduction titration with permanganate ion. A 4.230 g sample of the
Leya [2.2K]

Answer:

See explanation

Explanation:

The balanced redox reaction equation is;

8H+ + MnO4^- + 5Fe2+ ---------> Mn2+ + 5Fe3+ + 4H2O

Amount of KMnO4 reacted = 31.60/1000 * 0.05120 = 1.62 * 10^-3 moles

From the reaction equation;

1 mole of MnO4^- reacted with 5 moles of Fe2+

1.62 * 10^-3 moles will react with 1.62 * 10^-3 moles * 5/1 = 8.1 * 10^-3 moles

Mass of Fe2+ reacted = 8.1 * 10^-3 moles  *  56 g/mol

Mass of Fe2+ reacted = 0.45 g

Amount of iron in the sample =  0.45 g

Percentage of iron in the sample;

0.45 g/4.230 g  * 100 = 10.6 %

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2 years ago
What is the PH of a solution if [H3O]= 1.7×10-3 M
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14 Molar is its molarity.
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What is the formula of calcium carbonate​
lara31 [8.8K]

Answer:

<h3>hope its help u.................</h3>

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3 years ago
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What is the answer to 1 and 2?
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You got the questions correct
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