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galina1969 [7]
3 years ago
12

What areas did japan invade in 1931 and 1937

Chemistry
1 answer:
Yanka [14]3 years ago
3 0

Answer:

china

Explanation:

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If the pressure of a gas is quadrupled (4x), how
umka2103 [35]

Answer:

Yes. The volume would be 1/4 of the initial volume.

Explanation:

At constant temperature, the pressure of a gas is inversely proportional to the volume of the gas. Hence;

P1V1 = P2V2

<em>where P1 is the initial pressure, V1 is the initial volume, P2 is the final pressure, and V2 is the final volume.</em>

If the pressure of a gas is quadrupled;

P2 = 4P1, the equation becomes

P1V1 = 4P1 x V2

Making V2 the subject:

 V2 = P1V1/4P1

        V2 = V1/4

<em>This means that the volume would change by being reduced to </em><em>1/4 </em><em>of the initial volume.</em>

4 0
3 years ago
A first-order reaction is 45% complete at the end of 43 minutes. What is the length of the half-life of this reaction
shtirl [24]

The half-life of the reaction is 50 minutes

Data;

  • Time = 43 minutes
  • Type of reaction = first order
  • Amount of Completion = 45%

<h3>Reaction Constant</h3>

Let the initial concentration of the reaction be X_0

The reactant left = (1 - 0.45) X_0 = 0.55 X_0 = X

For a first order reaction

\ln(\frac{x}{x_o}) = -kt\\ k = \frac{1}{t}\ln (\frac{x_o}{x}) \\ k = \frac{1}{43}\ln (\frac{x_o}{0.55_o})\\ k = 0.013903 min^-^1

<h3>Half Life </h3>

The half-life of a reaction is said to be the time required for the initial amount of the reactant to reach half it's original size.

x = \frac{x_o}{2} \\t = t_\frac{1}{2} \\t_\frac{1}{2} = \frac{1}{k}\ln(\frac{x_o}{x_o/2})\\

Substitute the values

t_\frac{1}{2} = \frac{1}{k}\ln(2)=\frac{0.6931}{0.013903}\\t_\frac{1}{2}= 49.85 min = 50 min

The half-life of the reaction is 50 minutes

Learn more on half-life of a first order reaction here;

brainly.com/question/14936355

4 0
3 years ago
Iron is obtained by reaction of hematite (Fe2O3) with carbon monoxide. From the balanced reaction below, how many grams of iron
laila [671]

Answer: 2755.2 g of Fe will be produced from 24.6 mol of haematite.

Explanation:

The balanced chemical equation is:

Fe_2O_3+3CO\rightarrow 2Fe+3CO_2  

According to stoichiometry :

1 mole of Fe_2O_3 produce = 2 moles of Fe

Thus 24.6 moles of Fe_2O_3 will produce=\frac{2}{1}\times 24.6=49.2moles  of Fe  

Mass of Fe=moles\times {\text {Molar mass}}=49.2moles\times 56g/mol=2755.2g

Thus 2755.2 g of Fe will be produced from 24.6 mol of haematite.

3 0
3 years ago
What is the molecular formula for Tricarbon nonachloride?
vampirchik [111]

Answer:

C_{3}Cl_{9}

Explanation:

Molecular Formula is representation of the chemical compound in terms of the symbols of all the elements that are present in the compound followed by subscripts, which give the count of each element in that compound.

We need to write the molecular formula of Tricarbon nonachloride. Tri means three, so Tricarbon means there are 3 atoms of Carbon. Likewise, nona stands for 9, so nonachloride means there are 9 atoms of chlorine. Therefore, we can represent nonachloride as:

Carbon (3 atoms) Chlorine (9 atoms) = C_{3}Cl_{9}

Thus, molecular formula of Tricarbon nonachloride is C_{3}Cl_{9}

8 0
4 years ago
Read 3 more answers
Enter the chemical formula of a binary molecular compound of hydrogen and a Group 6A element that can reasonably be expected to
Ber [7]

Answer:

H₂Se

Explanation:

A way of estimating the acidity of a weak acid is by analizing the<em> stability of the formed anion</em>. In this case, we should find a Group 6A element that in its anionic forms (HX⁻ and X⁻²) is more stable than HS⁻ and S⁻², thus it would be more acidic in aqueous solution.

The anionic forms of Se are more stable than the forms of S, similarly to how Br⁻ is more stable than Cl⁻.

8 0
3 years ago
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