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3 years ago

Question 2

Chemistry

1 answer:

defon3 years ago

5 0

Answer:

Transition metals can have multiple oxidation states because of their electrons. The transition metals have several electrons with similar energies, so one or all of them can be removed, depending the circumstances. When they attach to other atoms, some of their electrons change energy levels.

Explanation:

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Identical objects are placed in Beaker A and Beaker B. The objects float as shown in the diagram. What can you conclude about th

vodka [1.7K]

I think it is a but dont take me for it. I searched it and thats what I found since liquid in beaker B is more dense then realtivley speaking the object is less dense compared other liquid and floats at a higher level.

3 0

3 years ago

Read 2 more answers

Compare and contrast magma and lava

motikmotik

Magma and lava are words that are used in relation to rock formation. Magma refers to melted rock, that is rock in liquid form, which is found in the earth's crust. The lava on the other hand to the magma which has escaped from the earth crust and has moved to the surface via volcano vent. Thus. magma and lava both refer to molten rock, but magma refers to the molten rock that is found underneath the earth while lava refer to the molten rock that is found on the earth surface; that is the difference between them.

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4 years ago

A 0.2 g sample of pyrolusite is analyzed for manganese content as follows. Add 50.0 mL of 0.1 M solution of ferrous ammonium sul

enyata [817]

Answer:

66.7%

Explanation:

The reaction for the titration of the excess ferrous ion is:

5Fe⁺² + MnO₄⁻ + 8H⁺ → 5Fe³⁺ + Mn²⁺ + 4H₂O

We calculate the moles of Fe⁺² from the used moles of KMnO₄:

0.02 M * 15.0 mL = 0.30 mmol KMnO₄

0.3 mmol KMnO₄ * $\frac{5mmolFe^{+2}}{1mmolKMnO_4}$ = 1.5 mmol Fe⁺²

Then we substract those 0.30 mmol from the original amount used:

0.1 M * 50.0 mL = 5.0 mmol Fe⁺²

5.0 - 1.5 = 3.5 mmol Fe⁺²

The reaction between ferrous ammonium sulfate and MnO₂ is:

2Fe⁺² + MnO₂ + 4H⁺ → 2Fe³⁺ + Mn²⁺ + 2H₂O

So we convert those 3.5 mmol Fe⁺² that were used in this reaction to MnO₂ moles:

3.5 mmol Fe⁺² * $\frac{1mmolMnO_2}{2mmolFe^{+2}}$ = 1.75 mmol MnO₂

Then we convert MnO₂ to Mn₃O₄, using the reaction:

3MnO₂ → Mn₃O₄ + O₂

1.75 mmol MnO₂ * $\frac{1mmolMn_3O_4}{3mmolMnO_2}$ = 0.583 mmol Mn₃O₄

Finally we convert Mn₃O₄ moles to grams:

0.583 mmol Mn₃O₄ * 228.82 mg/mmol = 133.40 mg Mn₃O₄

And calculate the percent

0.2 g = 200 mg

133.40 / 200 * 100% = 66.7%

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3 years ago

Which of the following pairs of chemical reactions are inverses of each other? Answer options: a. Hydrogenation and alkylation b

mariarad [96]

Answer:

d. Oxidation and reduction

Explanation:

For this question we have to remember the definition of each type of reaction:

-) Hydrogenation

In this reaction, we have the addition of hydrogen to a molecule. Usually, an alkene or alkyne. In the example, molecular hydrogen is added to a double bond to produce an alkane.

-) Alkylation

In this reaction, we have the addition of a chain of carbon to another molecule. In the example, an ethyl group is added to a benzene ring.

-) Hydrolysis

In this reaction, we have the breaking of a bond by the action of water. In the example, a water molecule can break the C-O bond in the ester molecule.

-) Halogenation

In this reaction, we have the addition of a halogen (atoms on the VIIIA group). In the example, "Cl" is added to the butene.

-) Ammoniation

In this reaction, we have the addition of the ammonium ion ( $NH_4^+$ ). In the example, the ammonium ion is added to an acid.