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Elodia [21]
3 years ago
11

Do this and ill do one of your questions

Chemistry
1 answer:
LUCKY_DIMON [66]3 years ago
4 0
The correct answer is because of chemical change
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A chemist combined 0.440 L of an unknown calcium solution with an excess of ammonium chromate. This resulted in the precipitatio
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The concentration of the original calcium ions is 0.005 M

<h3>What is concentration?</h3>

The term concentration has to do with the amount of substance in solution. We know that the concentration can be measured in a lot of units such as mole/litre, grams per litre, percentage and so on.

As such we have the equation;

Ca^2+(aq) + (NH4)2CrO4(aq) --------> CaCrO4(s) + 2NH4^+(aq)

Number of moles of the precipitate = 346.7 * 10^-3 g/156 g/mol

= 0.0022 moles

Now;

1 mole of Ca^2+ produces 1 mole of CaCrO4 hence 0.0022 moles of CaCrO4 was produced by  0.0022 moles of CaCrO4.

Given that the volume of the solution is  0.440 L, the concentration of the solution is;   0.0022 moles/0.440 L

= 0.005 M

Learn more about molarity:brainly.com/question/8732513

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1 year ago
What could we use to measure the energy of particles when we are unable to see them
iVinArrow [24]

Answer:

Temperature.

Explanation:

Temperature is a measure of the average kinetic energy of a system.

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3 years ago
Phosphorus that is stored in organisms
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B. Recycles slowly

And it also depends on the organism

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Decide whether a chemical reaction happens in either of the following situations. If a reaction does happen, write the chemical
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Explanation:

A strip of solid palladium metal is put into a beaker of nicl2

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To answer this question properly you must refer to the reactivity series.

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In this series, Nickel is higher than Palladium. This means that if a Palladium strip is placed into a solution of a Ni salt, then a reaction will not take place, nothing would happen.

Because Pd is lower than Ni in the reactivity series.

There is no reaction so no equation.

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3 years ago
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