1) Answer is: the oxidation number of manganese in MnO₄⁻ is +7.
Permanganate anion has negative charge 1-.
Oxygen (O) in permanganate anion has oxidation number -2.
x + 4 · (-2) = -1.
x - 8 = -1.
x = +7; oxidation nzmber of manganese.
Oxidation number shows the degree of oxidation of an atom in a chemical compound.
2) Answer is: Zn + Cu2+ → Zn2+ + Cu.
In this chemical reaction, there is transfer of electrons from zinc (Zn) to copper (Cu). Zinc change oxidation number from 0 to +2 (lost electrons) and copper change oxidation number from +2 to 0 (gain electrons).
Oxidation half reaction: Zn⁰ → Zn²⁺ + 2e⁻.
Reduction half reaction: Cu²⁺ + 2e⁻ → Cu⁰.
In other chemical reactions, there is no change of oxidation number of elements.
3) Answer is: Br2 is the oxidizing agent because its oxidation number decreases.
Balanced chemical reaction: 2Al + 3Br₂ → 2AlBr₃.
In this chemical reaction, aluminium change oxidation number from 0 to +3 (lose electrons) and bromine change oxidation number from 0 to -1 (gain electrons, reduced).
Oxidizing agent is a substance that has the ability to oxidize other substances, to cause them to lose electrons.
In oxido-reduction reaction, at least one element lose and one element gain electrons.
4) Answer is: Br2 + 2Cl− → Cl2 + 2Br⁻.
Oxidation is increase of oxidation number.
In this balanced chemical reaction, chlorine change oxidation number from -1 (Cl⁻) to oxidation number 0 (Cl₂).
Oxidation half reaction: 2Cl⁻ → Cl₂⁰ + 2e⁻.
Reduction half reaction: Br₂ + 2e⁻ → 2Br⁻.
In other chemical reactions, chlorine is reduced.
5) Answer is: Observation 1 is a result of copper ions moving into the solution.
The reactivity series is a series of metals from highest to lowest reactivity. Metal higher in the reactivity series will displace another.
Copper (Cu) is higher in activity series than silver (Ag), so copper lose electron and silver gain electrons.
Copper is oxidized (increase of oxidation number) and silver is reduced.
Answer:
There's no one-upping that one so I'll just tell you that they were right on my test :)
Explanation:
you're welcome
The elements X and Y combine in different ratios to form four different types of compounds: XY, XY₂, XY₃, and XY₄. Consider that there is enough of each sample to contain 2 g of X, and the mass of X is estimated to be 2 g and the mass of Y is estimated to be 4 g.
Arrange the following ratios in order of their increasing value. (The exercise gives me three tabs to put in order from highest to least. These are in the pic)
Rank from highest to lowest ratio. To rank items as equivalent, overlap them.
I put XY₄ as highest, then XY₃ in the middle, and XY₂ as lowest. Is this order correct? I'm not quite understanding this lesson :// so if i could also get some sort of an explanation, that'd be great!!
Yeah, it would be that order since if XY was a number, you would multiply it by that number 4 total times. So it would be a large number. And then it gets smaller and smaller when it gets to XY2. So yeah you got the order correct.
Elements are species of atoms that are defined and characterized by the number of protons. The multiple proportions of the element from higher to lowest are XY₄, XY₃, and XY₂.
What are elements?Elements have been defined as the atomic species that make the molecule and the compounds by combining chemically through bond formation. They are indivisible particles that cannot be broken further.
When two or more elements chemically links then a compound or molecule is formed like element X and Y combined in various ratios and proportions to form XY, XY₂, XY₃, and XY₄.
The highest ratio of the proportions will be XY₄ as it has one X and four Y elements, followed by XY₃ with one X and three Y. Lastly XY₂ will be the lowest ratio as it has one X and two Y elements.
Therefore, the order is XY₄> XY₃ > XY₂.
Learn more about elements, here:
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