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ycow [4]
3 years ago
5

An atomic number stands for the number of _____.

Chemistry
2 answers:
SVETLANKA909090 [29]3 years ago
8 0
The atomic # = the # of protons
Umnica [9.8K]3 years ago
3 0
An atomic number stands for the number of protons
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The concentration of hydrogen peroxide (H2O2) can be determined by titrating it with an acidified MnO4− solution. The following
Vaselesa [24]

Answer:

A) {MnO_4}^- + 3 H^+ + \frac{5}{2} H_2O_2 \rightarrow Mn^{2+} + 4 H_2O + \frac{5}{2} O_2

B) 7.5 molar

Explanation:

A) <u>Reduction</u>

{MnO_4}^- + 8 H^+ + 5e^- \rightarrow Mn^{2+} + 4 H_2O

<u>Oxidation</u>

H_2O_2 \rightarrow O_2 + 2 H^+ + 2e^-

Multiplying the oxidation reaction by 5/2 and adding it to the reduction equation:

{MnO_4}^- + 8 H^+ + 5e^- \rightarrow Mn^{2+} + 4 H_2O

+

\frac{5}{2} H_2O_2 \rightarrow \frac{5}{2} O_2 + 5 H^+ + 5e^-

-----------------------------------------------------------------------------------------------------

{MnO_4}^- + 3 H^+ + \frac{5}{2} H_2O_2 \rightarrow Mn^{2+} + 4 H_2O + \frac{5}{2} O_2

B) 10 ml = 0.01 L

20 ml = 0.02 L

mol of MnO4− = molarity*volume = 1.5*0.02 = 0.03

1 mol of MnO4− reacts with 5/2 mol of H2O2, then:

mol of H2O2 = 0.03*5/2 = 0.075

molarity = mol/volume = 0.075/0.01 = 7.5 molar

5 0
3 years ago
How is mass calculated given density and volume?
KonstantinChe [14]

Taking into account the definition of density, mass can be calculated as the multiplication between density and volume.

<h3> Density</h3>

Density is defined as the property that matter, whether solid, liquid or gas, has to compress into a given space.

In other words, density is a quantity that allows us to measure the amount of mass in a certain volume of a substance.

Then, the expression for the calculation of density is the quotient between the mass of a body and the volume it occupies:

density= mass÷ volume

From this expression it can be deduced that density is inversely proportional to volume: the smaller the volume occupied by a given mass, the higher the density.

<h3>Mass given density and volume</h3>

In this case, you know the density and volume of a compound.

From the definition of density, you can calculate mass as follows:

<u><em>mass= density ×volume</em></u>

In summary, mass can be calculated as the multiplication between density and volume.

Learn more about density:

brainly.com/question/952755

brainly.com/question/1462554

#SPJ1

4 0
2 years ago
What reaction shows one element taking the place of another in a compound?
Charra [1.4K]
<span>A single-replacement reaction</span>
8 0
3 years ago
What is chlorine anyone tell​
laiz [17]

Answer:

Chlorine is a chemical element with the symbol Cl and atomic number 17. 

8 0
3 years ago
Read 2 more answers
I ONLY NEED 1 EXAMPLE for each one PLZ HELP ME I WILL MAKE BRAINLIST HELP ME FAST PLZ!!!! Using a skillet on the stove to cook s
d1i1m1o1n [39]

<u><em>Conduction</em></u> is your first answer. More examples are; touching a hot light bulb and walking on concrete in summer.

Your second answer is <u><em>C. Radiation</em></u>. More examples are; a sauna and a hot car motor.

Hope this helps!

⊕

6 0
3 years ago
Read 2 more answers
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