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alex41 [277]
3 years ago
6

Which of the following ions is in the lowest oxidation state?

Chemistry
2 answers:
hodyreva [135]3 years ago
7 0

Answer:

B. Cr in Cr_{2}O_{7}^{-2}

Explanation:

Let us first find the oxidation numbers in each of the following scenarios

A. The oxidation number of P in H_{2}PO_{4}^{-} \\ is +5

    because 2H + 4O + P = -1

                    2(1) +4(-2)  + P = -1

                              P = 5

B. The oxidation number of Cr in Cr_{2}O_{7} ]^{-2} \\ is

                 2Cr + 7O = -2

                 2Cr + 7(-2) = -2

                           Cr = 6

C. The oxidation number of Fe in Fe_{2}O_{3} is +3

                          2Fe + 3O = 0

                          2Fe + 3(-2) = 0

                               Fe = 3

The final answer is Cr

bulgar [2K]3 years ago
5 0

Answer:

I believe it is a hope this helps

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Multiple choice-- please help!
kvasek [131]

The rate law for the reaction : r=k.[A]²

<h3>Further explanation</h3>

Given

Reaction

A ⟶ B + C

Required

The rate law

Solution

The rate law is a chemical equation that shows the relationship between reaction rate and the concentration / pressure of the reactants

For the second-order reaction it can be:

1. the square of the concentration of one reactant.

\tt r=k[A]^2

2. the product of the concentrations of two reactants.

\tt r=k[A][B]

And the reaction should be(for second order) :

2A ⟶ B + C

Thus, for reaction above (reactant consumption rate) :

\tt r=-\dfrac{\Delta A}{2\Delta t}=k[A]^2

6 0
2 years ago
A chlorine (CI) atom has 7 valence electrons. Which of the following would be the most likely way for a chlorine atom to become
pogonyaev

Answer:

Option C. Gain 1 electron

Explanation:

Valence electron(s) are the electron(s) located on the outermost shell of an atom. Valency is simply defined as the combining power of an atom.

Chlorine (Cl) atom has 7 valence electron. This implies that Cl needs just one electron to complete it's octet configuration. It will be difficult for Cl to lose any of it's valence electron(s). Cl can either gain or share 1 electron to become stable.

Thus, considering the options given in the question above, option C gives the correct answer to the question.

3 0
2 years ago
The amount of space a material occupies is its
SIZIF [17.4K]

Answer:

—MASS is the amount of matter that makes up something. - VOLUME _ is the amount of space that a material takes up.

Explanation:

5 0
3 years ago
Consider the reaction below. If you start with 4.00 moles of C3H8 (propane) and 4.00 moles of O2 , how many moles of propane wou
fgiga [73]

Answer:

0.800 mol

Explanation:

We have the amounts of two reactants, so this is a limiting reactant problem.  

We know that we will need a balanced equation with moles of the compounds involved.  

Step 1. <em>Gather all the information</em> in one place.

            C₃H₈ + 5O₂ ⟶ 3CO₂ + 4H₂O

n/mol:  4.00    4.00

===============

Step 2. Identify the <em>limiting reactant </em>

Calculate the <em>moles of CO₂</em> we can obtain from each reactant.  

<em>From C₃H₈:</em>

The molar ratio of CO₂: C₃H₈ is 3:1

Moles of CO₂ = 4.00 × 3/1

Moles of CO₂ = 12.0 mol CO₂

<em>From O₂</em>:

The molar ratio of CO₂: O₂ is 3:5.

Moles of CO₂ = 4.00 × ⅗

Moles of CO₂ = 2.40 mol CO₂

O₂ is the limiting reactant because it gives the smaller amount of CO₂.

==============

Step 3. Calculate the <em>moles of C₃H₈ consumed</em>.

The molar ratio of C₃H₈:O₂ is 1:5.

Moles of C₃H₈ = 4.00 × ⅕

Moles of C₃H₈ = 0.800 mol C₃H₈

7 0
3 years ago
How TO DO THIS QUESTION PLEASE PLEASEEEEEEEEEeeeeeeeeeeeeeeeeeeee​
krok68 [10]
O2 is the limited reactant

3 0
2 years ago
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