These are three questions each with its complete answer.
A.) Mg(s) + Br₂(g) → MgBr₂(s)
Answer:
- substance being oxidized: Mg
- substance being reduced: Br
Explanation:
<u>1) Determine the oxidation states of all the elements</u>
a) <u>Reactant side</u>:
- Mg(s): 0, since the oxidation state of pure elements is zero
- Br₂: 0, since the oxidation state of pure elements is zero
b) <u>Product side</u>:
Br, such as the other halogens, form metal halides with oxidation state -1
Mg, such as other earth alkalyn metals, use oxidation state +2
Verify that the compound is neutral: 2 (-1) + 2 = 0.
<u>2) Look at the changes:</u>
- Mg passed from 0 to +2. Increase on the oxidation state means oxidation.
- Br passed from 0 to - 1. Decrease on the oxidation state means reduction.
<u>Conclusion:</u>
- Substance being oxidized: Mg
- Substance being reduced: Br
B.) 2Cr³⁺(aq) + 3Mn(s) → 2Cr(s) + 3Mn²⁺(aq)
Answer:
- substance being oxidized: Mn
- substance being reduced: Cr
Explanation:
<u>1) Determine the oxidation states of all the elements</u>
a) <u>Reactant side</u>:
- Cr: +3, since it is indicated as a superscript to the right of the symbol.
- Mn: 0, since the oxidation state of pure elements is zero
b) <u>Product side</u>:
- Cr: 0, since the oxidation state of the pure elements is zero.
- Mn: +2, since it is indicated as s superscript to the right of the atom.
<u>2) Look at the changes:</u>
- Cr passed from +3 to 0. Decrease on the oxidation state means reduction.
- Mn passed from 0 to + 2. Increase on the oxidation state means oxidation.
<u>Conclusion:</u>
- Substance being oxidized: Mg
- Substance being reduced: Br
C.) 2H⁺ (aq) + Ni(s) → H₂(g) + Ni²⁺ (aq)
- substance being oxidized: Ni
- substance being reduced: H
<u>1) Determine the oxidation states of all the elements</u>
a) <u>Reactant side</u>:
- H: +1, since it is understood a number 1 in front of the + symbol to rright of the chemical symbol.
- Ni: 0, since the oxidation state of pure elements is zero
b) <u>Product side</u>:
- H₂(g): 0, since the oxidation state of the pure elements is zero.
- Ni: +2, since it is indicated as s superscript to the right of the ion.
<u>2) Look at the changes:</u>
- H passed from +1 to 0. Decrease on the oxidation state means reduction.
- Ni passed from 0 to + 2. Increase on the oxidation state means oxidation.
<u>Conclusion:</u>
- Substance being oxidized: Ni
- Substance being reduced: H
100.5cm or 100.5ml
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Answer:
The correct answer is - D. It gets rid of pathogens that invade the body.
Explanation:
Like all other organ systems, the immune system is an organ system that involves several special organs that helps in fighting any foreign object or infection that invades our body. This organ system produces specific cells or chemicals to fight or kill the microbes, and unnatural change takes place in the body.
The organs involved in the immune system are lymphocytes or white blood cells, the complement system, antibodies, the lymphatic system the thymus, bone marrow, and the spleen.
All these combinedly helps in fighting, killing the microbes or infections that occur in the body, and correct the physiological changes that occur in the body to get rid of pathogens that invade the body.
RMM of CaH2=20+(1x2)=22
Number of moles or formula units
=mass/RMM
=8.294/22
=0.377
Explanation:
Ionic bonds are bonds formed as a result of the electrostatic attraction between two species.
- This bond type is an interatomic bond.
- It forms when two specie with a large electronegative difference between them combines.
- This is usually a metal and a non-metal.
- The metal loses its valence electrons and becomes positively charged.
- The non-metal gains the electron and becomes negatively charged.
- An electrostatic attraction between the two specie leads to the formation of an ionic bond.
- They are solids with a high melting point.
- They are soluble in polar solvents.
learn more:
Ionic bonds brainly.com/question/6071838
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