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vredina [299]
3 years ago
11

PLEASE HELP FILL OUT THIS CHART! ASAP THANK YOU

Chemistry
1 answer:
Svet_ta [14]3 years ago
6 0
I will need a picture if the periodic table
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The titration of 25.0 mL of an iron(II) solution required 18.0 mL of a 0.145 M solution of dichromate to reach the equivalence p
Svetlanka [38]

Answer:

0.64 M

Explanation:

Given:

Volume of iron(II) solution (V₁) = 25.0 mL = 0.025 L

Molarity of iron(II) solution (M₁) = ?

Number of moles of iron(II) solution (n₁) = ?

Volume of dichromate solution (V₂) = 18.0 mL = 0.018 L

Molarity of dichromate solution (M₂) = 0.145 M

Number of moles of dichromate solution (n₂) = ?

Molarity is equal to the ratio of moles and volume.

So, molarity of dichromate solution is given as:

M_2=\frac{n_2}{V_2}\\\\n_2=M_2\times V_2=0.145\times 0.018 = 2.61\times 10^{-3}\ mol

Now, let us write the complete balanced reaction for the given situation.

So, the complete balanced equation is given below.

6Fe^{2+}(aq)+Cr_2O_7^{2-}(aq)+14H^+(aq)\to 6Fe^{3+}(aq)+2Cr^{3+}(aq)+7H_2O

From the equation, it is clear that, 1 mole of dichromate is required for 6 moles of iron(II) solution.

So, using unitary method, we find the number of moles of iron(II) solution.

1 mole of dichromate = 6 moles of iron(II)

∴ n₂ moles of dichromate = 6n₂ moles of iron(II)

                                          = 6\times 2.61\times 10^{-3}=0.016\ mol\ Fe^{2+}

So, 0.016 moles of iron(II) is needed. Therefore, n_1=0.016\ mol

Now, molarity of iron(II) solution is given as:

Molarity = Moles ÷ Volume

M_1=\frac{n_1}{V_1}\\\\M_1=\frac{0.016\ mol}{0.025\ L}=0.64\ M

Therefore, the molarity of the iron(II) solution is 0.64 M.

4 0
3 years ago
24. As the first five elements in Group 14 are considered in order from top to bottom, there are changes
myrzilka [38]

Answer:

B

Explanation:

As you move down the periodic table in the carbon family, the atomic radius and ionic radius increase while electronegativity and ionization energy decrease. Atom size increases moving down the group because an additional electron shell is added.

8 0
2 years ago
Burning gasoline as fuel for a car involves
Nostrana [21]

Thermal energy

mechanical energy

chemical energy

3 0
3 years ago
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What is the volume of 0.410 moles of co2 at STP​
inna [77]

Answer: 9.18 Litres

Standard Temperature and Pressure (STP). Think of this as the perfect environment where the Temp. is 0°C or 273 Kelvin and Pressure is always 1 atm. This is only true in STP.

This question uses the Ideal Gas Equation:

PV=nRT

P= 1 atm

V = ??

T = 273 K (always convert to Kelvin unless told otherwise)

n = 0.410 mol

R = 0.0821 L.atm/mol.K

What R constant to use depends on the units of the other values. (look at the attachments) The units cancel out and only Litres is left. You simply multiply the values.

6 0
3 years ago
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Explain why some atoms gain or lose electrons to form ions.
anygoal [31]
Because some atoms<span> are more stable when they </span>gain or lose<span> an </span>electron<span> and </span>form ions<span>.</span>
7 0
3 years ago
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