Answer:
Mg²⁺ cation
Br⁻ anion
Explanation:
Magnesium is present in group two of periodic table.
It is alkaline earth metal.
It has two valance electrons.
Thus by losing two valance electrons it complete the octet. The common oxidation state of magnesium is +2.
The bromine is present in group seventeen.
It has seven valance electrons.
It is the member of halogen family.
To complete the octet bromine required one electron. By gaining the one electron it showed -1 oxidation state.
When bromine combine with magnesium both formed MgBr₂.
The one atom of Mg have +2 oxidation state while bromine have -1 that's why to make the overall compound neutral two bromine atoms combine with one atom of magnesium.
In chemistry, increasing the concentration of one of the reactants increases the reaction rate because there are more reactant particles available for successful collisions and subsequent reactions.
In the field of chemistry, the concentration of reactants can significantly impact the rate of a reaction. According to the rate law, the rate of a reaction is directly proportional to the concentration of the reactants. Therefore, if you increase the concentration of one of the reactants, the reaction rate will also increase. This is because there are more particles available to collide and react, which increases the likelihood of successful collisions, thereby accelerating the reaction rate. For example, if you have a cup of tea and you increase the concentration of sugar (one of the reactants), the sugar will dissolve faster, indicating a faster reaction rate.
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Answer:
86.04 %
Explanation:
Data given:
mass of Al = 160.0 g
actual yield Al₂O₃= 260 g
Theoretical yield = ?
percent yield ofAl₂O₃ = ?
Solution:
First we have to find theoretical yield.
So,
we Look at the balanced reaction
4Al + 3O₂ -----—> 2Al₂O₃
4 mol 2 mol
As 4 mole of Al give 2 mole of Al₂O₃
Convert moles to mass
molar mass of Al = 27 g/mol
molar mass of Al₂O₃ = 2(27) + 3(16)
molar mass of Al₂O₃ = 54 + 48
molar mass of Al₂O₃ = 102 g/mol
Now
4Al + 3O₂ -----—> 2Al₂O₃
4 mol (27g/mol) 2 mol (102 g/mol)
108 g 204 g
108 grams of Al produce 204 g of Al₂O₃
So
if 108 grams of Al produce 204 g of Al₂O₃ so how many grams of Al₂O₃will be produced by 160 g of Al.
Apply Unity Formula
108 grams of Al ≅ 204 g of Al₂O₃
160 grams of Al ≅ X of Al₂O₃
Do cross multiply
mass of Al₂O₃= 204 g x 160 g / 108 g
mass of Al₂O₃ = 302.2 g
So the Theoretical yield of Al₂O₃ = 302.2 g
Now Find the percent yield of Al₂O₃
Formula Used
percent yield = actual yield /theoretical yield x 100 %
Put value in the above formula
percent yield = 260g / 302.2 g x 100 %
percent yield = 86.04 %
percent yield of Al₂O₃ = 86.04 %
A) the atmosphere lacked oxygen
B) only fish lived during that time
C) the dinosaurs used all the oxygen
D) the atmosphere had lots of oxygen
Scientist infers about a specific period of Earth's history if many fossils were discovered from oxygen-breathing organisms, only fish lived during that time. The correct option is B).
The preserved remnants of plants and animals that were submerged in sediments like sand and mud beneath ancient seas, lakes, and rivers are known as fossils.
The skeleton remains when an animal passes away because the soft components of its body disintegrate first. Sediment, which is made up of tiny rocks, buries this. The sediment surrounding the skeleton starts to consolidate and convert to rock when new layers of sediment are added on top.
A group of fossils that have been examined, classified, and organized both historically and taxonomically make up a fossil record. When organisms die, they are encased in mud and rock and eventually replaced over time by minerals.
Therefore, the correct option is B) only fish lived during that time.
To learn more about fossils, refer to the link:
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Answer:
d is wrong the correct answer is b
Explanation:
The atmosphere lacked oxygen is correct. The lack of animals that used oxygen suggests that the environment did not have much oxygen.
Answer:
Polygenic Inheritance is where one trait (for example, eye color) is determined by multiple genes (two or more).
This typically happens when there is a wide variety of this trait (e.g. height, eye color, hair color, skin color, etc.).
B. Non-metals tend to have high ionization energy and high electronegativity.
O C. Non-metals tend to have low ionization energy and low electronegativity.
D. Non-metals tend to have high ionization energy and low electronegativity.
The statement about non-metals that is correct is B. Non-metals tend to have high ionization energy and high electronegativity.
A non-metal doesn't she the characteristics of a metal. It has poor thermal and electrical conductivity. Also, non-metals have a low melting point and low density.
On the other hand, mon-metals have high ionization energy, high electronegativity, and high electron affinity. When there react with other elements, they gain electrons.
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Answer:
The correct answer is option B, that is, non-metals tend to exhibit high electronegativity and ionization energy.
Explanation:
A chemical element, which is primarily devoid of the feature of metal is termed as a non-metal. A non-metal generally exhibit poor electrical and thermal conductivity and is brittle in solid-state. The non-metals generally possess a comparatively low boiling and melting point and also has low density.
Chemically, the non-metals exhibit comparatively high electron affinity, high electronegativity, and high ionization energy. Upon reaction with other elements and chemical compounds, these elements share or gain electrons. The non-metals are typically seventeen in number and are differentiated into two kinds, that is, noble gases and reactive non-metals.