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Karo-lina-s [1.5K]

4 years ago

5

When NADH donates two electrons to ubiquinone during respiration, ubiquinone isa. reduced.b. oxidized.c. phosphorylated.d. aerob

ic.e. hydrolyzed.

1 answer:

olga nikolaevna [1]4 years ago

5 0

Reduced ... more electrons gain is a reduction

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In most of its compounds, this element exists as a monatomic cation.

Reptile [31]

The answer should be (D) Ca, because all others either occur as diatomic or are anions.

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3 years ago

If 26.2 mL of AgNO3 is needed to precipitate all the Cl− ions in a 0.785-mg sample of KCl (forming AgCl), what is the molarity o

sweet-ann [11.9K]

<u>Answer:</u>

<em>The molarity of the $AgNO_3$ solution is $4.02 \times 10^4 M$ </em>

<em></em>

<u>Explanation:</u>

The Balanced chemical equation is

$1AgNO_3 (aq) +1KCl (aq) > 1 AgCl (s)+1KNO_3 (aq)$

Mole ratio of $AgNO_3$ : KCl is 1 : 1

So moles $AgNO_3$ = moles KCl

$Moles KCl = \frac {mass}{molarmass}$

$= \frac {0.785 mg}{(39.1+35.5 g per mol)}$

$= \frac {0.000785 g}{74.6 g per mol}$

$= 0. 0000105 mol KCl$

$= 0.0000105 mol AgNO_3$

So Molarity

$= \frac {moles of solute}{(volume of solution in L)}$

$= \frac {0.0000105 mol}{26.2 mL}$

$=\frac {0.0000105 mol}{0.0262 L}$

= 0.000402M or mol/L is the Answer

(Or) $4.02 \times 10^4 M$ is the Answer

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3 years ago

What kind of change took place when the magnesium was heated?

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Answer:

You can see that it is an endothermic reaction or heat is being absorbed for the change from magnesium to magnesium oxide. So it is an endothermic reaction. So these are the four reasons why we can say that burning of magnesium ribbon in the air is considered a chemical change.

Explanation:

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