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2 years ago

the half of an oxidation-reduction reaction shows the iron gains. what does this electron gain mean for iron.

Chemistry

1 answer:

Nataly [62]2 years ago

3 0

The correct answer is option C, that is, it is reduced.

In reduction and oxidation reactions, reduction refers to the loss of an oxygen atom from a molecule or the gaining of one or more electrons. A reduction reaction is observed from the perspective of the molecule being reduced, as when one molecule gets reduced, another one gets oxidized. The complete reaction is called a redox reaction.

In the given case, iron gains electrons mean that it is reduced.

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What mass of Fe(OH)3 will be obtained when 100. mL of 0.240 M FeCl3 is mixed with 200. mL of 0.182 M NaOH?

ratelena [41]

Answer:

648.68 mg

Explanation:

The reaction that takes place is:

FeCl₃ + 3NaOH → Fe(OH)₃ + 3NaCl

First we calculate how many moles of each reactant were added, using the given volumes and concentrations:

FeCl₃ ⇒ 100 mL * 0.240 M = 24 mmol FeCl₃

NaOH ⇒ 100 mL * 0.182 M = 18.2 mmol NaOH

24 mmol of FeCl₃ would react completely with (24 * 3) 72 mmol of NaOH. There are not as many NaOH mmoles, so NaOH is the limiting reactant.

Now we calculate how many moles of Fe(OH)₃ are formed, using the moles of the limiting reactant:

18.2 mmol NaOH * $\frac{1mmolFe(OH)_3}{3mmolNaOH}$ = 6.07 mmol Fe(OH)₃

Finally we convert 6.07 mmol Fe(OH)₃ to grams, using its molar mass:

6.07 mmol Fe(OH)₃ * 106.867 mg/mmol = 648.68 mg

7 0

3 years ago

According to Chargaff's Rule, if a segment of DNA contains 60 cytosine bases out of a total of 300 bases how many thymine bases

bija089 [108]

Answer:

90 Thymine bases

Explanation:

Chargaff's rules states that in the DNA of any organism, the amount of purine and pyrimidine bases must be in a 1:1 ratio. This means that the amount of Adenine and Guanine bases (purines) should be equal with their complementary pairs of Thymine and Cytosine bases respectively (pyrimidines). (A = T) + (G = C) = 100

Hence, according to this question, if there are 60 cytosine bases, this means that there will be 60 Guanine bases. 60 C + 60 G = 120 pyrimidines

300 total bases - 120 pyrimidine bases = 180 purine bases.

180/2 = 90 equal bases of Adenine and Thymine. Hence, Thymine bases will be 90.

3 0

2 years ago

Balance this chemical equation. Choose "blank" for the box if no other coefficient is needed. Writing the symbol implies "1."

DENIUS [597]

Answer: $3NH_4OH+AlCl_3\rightarrow Al(OH)_3+3NH_4Cl$

Explanation: A double displacement reaction is one in which exchange of ions take place.

According to the law of conservation of mass, mass can neither be created nor be destroyed. Thus the mass of products has to be equal to the mass of reactants. The number of atoms of each element has to be same on reactant and product side. Thus chemical equations are balanced.

$3NH_4OH+AlCl_3\rightarrow Al(OH)_3+3NH_4Cl$

4 0

2 years ago

Structure of tetrazine

Vika [28.1K]

Answer:

Tetrazine is a compound that consists of a six-membered aromatic ring containing four nitrogen atoms with the molecular formula C2H2N4.

(See the image)

Hope it helps!

3 0

2 years ago

A particular atom has 58 protons and 82 neutrons. What are the atomic number, mass number, and periodic table symbol of this iso

anygoal [31]

Atomic Numbers are the number of protons within the nucleus,
which is 58 here.
Atomic Number=58
Mass Number is the sum of the protons and neutrons in the nucleus,
=58+82
Mass Number=140
Periodic symbol of this isotope is entirely dependent on the number of protons, 58, which corresponds to the element Cerium, abbreviated as Ce in the periodic table.
Periodic Symbol=Ce

5 0

3 years ago