The simple interest is equal to $3740 on a principal of $ 22,000, deposited for 4 years at a rate of 4.25 %.
What is simple interest?Simple interest can be based on the principal of a loan. Simple interest does not compound, a creditor only pays interest on the principal amount and a borrower never has to pay more interest on the previous interest.
Simple Interest (S.I.) can be described as the method of determining the interest amount for a principal of money at the rate of interest.
To determine simple interest, multiply the principal by the interest rate and the time.
Simple Interest = Principal ×Rate × Time
Given, the principal amount, P =$ 22000
The rate, R = 4.25%
Time, T = 4 years
The simple interest can be calculated as:
[tex]\displaystyle S.I. =\frac{P\times R\times T}{100}[/tex]
[tex]\displaystyle S.I. =\frac{22000\times 4.25\times 4}{100}[/tex]
Simple interest = $ 3740
Therefore, the simple interest is equal to $ 3740.
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Millikan measured the quantity of charge carried
by an electron. How did he then calculate the
mass of an electron?
Answer:
m = E × Q
And Q = I × t
m = E × I × t
Where m = mass in grams
Q = quantity of electricity in coulomb
I = current in ampere
t = time in seconds
E = electrochemical equivalent of the substance
Explanation:
how many feet are there in58 yards ?
PLEASE MARK BRAINLIEST!
Answer:
To find how many feet their are in 58 yards, you have to multiply 58 yards by 3, because their are 3 ft per yard.
Explanation:
58 * 3 = ?
58 * 3 = 174 feet
Your answer is 174 feet.
I hope this helps!
From either Electronegativity, symbols of elements, ionization energy and atomic radius what is not a trend that varied systematically in the periodic table?
Answer:
Symbols of elements
Explanation:
Symbols of elements corresponding to their names do not vary systematically in the periodic table. The only systematic variation might be an alphabetical order, either ascending or descending, but we don't see this trend in the periodic table.
The other properties, however, vary systematically:
Electronegativity: the closer an element is to fluorine, the more electronegative it is. The closer it is to francium, the less electronegative it is;Ionization energy: it decreases from right to left along the period and down the group, as atomic size increases and there's a lower attraction force between a nucleus and valence electrons;Atomic radius: it increases from right to left along the period and down the group.An atom of an element with atomic number 48 in mass number 120 contains how many electrons
Answer:
48
Explanation:
So all we have to consider here is the atomic number. Remember that in a neutral atom the amount of electrons = the amount of protons.
Also that the atomic number = the number of protons.
So we can say that in an atom with atomic number 48, there are 48 protons and therefore 48 electrons.
An atom of an element with an atomic number of 48 and mass number of 120 contains 48 electrons, indicating that it is a neutral atom. The number of neutrons can be determined by subtracting the atomic number from the mass number, which in this case, gives 72 neutrons.
Explanation:The atomic number of an element 48 in this case, defines the number of protons in its nucleus and also, in a neutral atom, the number of electrons. Therefore, an atom of an element with an atomic number of 48 contains 48 electrons. The mass number (120) is the sum of the number of protons and neutrons in the atom's nucleus. To find the number of neutrons, we subtract the atomic number from the mass number (120-48), which gives us 72 neutrons.
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when a chemical change occurs, what do you know about the amount of matter in the new substances? what is this known as?( is it suppose to be a science question)
Explanation:
The law of conservation of mass states that the total mass of the products is equal to the total of the reactants.
A chemical change occurs because of a chemical reaction.
In a chemical reaction, the reactants are the starting substances and the products is the finishing substances. The amount of each type of atoms to start with and end with are also equal.
No matter disappears after a chemical reaction.
Answer:
The amount of matter in the new substances is the same as the original.
This is known as the law of conservation of mass.
Final answer:
In a chemical change, the law of conservation of matter indicates that the total amount of matter remains constant, with atoms being rearranged but not created or destroyed.
Explanation:
When a chemical change occurs, the amount of matter in the new substances remains unchanged according to the law of conservation of matter. This fundamental principle asserts that during any chemical reaction, matter is neither created nor destroyed. Instead, the atoms are simply rearranged to form new substances. Therefore, the number and type of atoms present after a chemical change are the same as those before the change took place.
The formation of new substances implies that one kind of matter is transformed into a different kind. Although the properties and appearance might change significantly, the total mass remains constant. For everyday chemical reactions, any mass changes are too negligible to measure, and thus the law holds true. However, in nuclear reactions, which involve changes to the nucleus of an atom, the energy changes can be significant enough to result in detectable mass changes. In such cases, the laws of conservation of matter and energy are considered in a combined way to reflect that the total quantity of matter and energy is fixed.
which element belongs to the P^6 -block of the periodic table
Answer:
The P6 block of the periodic table is the block that belong to the noble gases. The noble gases in P6 block are: Helium, neon, argon, krypton, xenon and radon
Explanation:
P-block elements in periodic table is non-metals. The elements which belongs to p⁶ block are noble gases, i.e., helium, neon, argon, krypton, xenon and radon.
What are noble gases?Nobel gases are inert gases having completely filled orbitals. Hence they are normally unreactive. Noble gases are non-metals and exists in gaseous state.
Noble gases are termed as p⁶ elements because, their valence p orbital is completely filled by 6 electrons. Therefore the noble gases helium, neon, argon, krypton, xenon and radon are termed as p⁶ block elements.
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Flammability is a material’s ability to burn in the presence of
Answer:
Flammability is a material’s ability to burn in the presence of oxygen.
Explanation:
Flammability can be described as the ability of a substance to get ignited. Flammability will lead to fire or combustion. Some substances are highly flammable like Benzene. Other tend to be just flammable. And there are also compounds which will nor be flammable at all as they won't react with oxygen. Examples of these substances include helium, steel or glass.
The flammability of a substance shall be considered a very important aspect when storing or transporting a substance.
Four atoms of hydrogen combine with one carbon atom to form CH4, but only two hydrogen atoms combine with one oxygen atom to form H2O. Why?
Answer:
because its water
Explanation:
Answer:
Hydrogen has one valence electron, Atoms may share electrons in order to fill their electron shells, Oxygen has two vacancies in its electron shell, but carbon has four vacancies.
Explanation:
i jus did it on study island :P
Mushrooms, bread molds, and yeasts are classified together in the fungi kingdom. Specivic
characteristics are used to classify these organisms. Which of the following is a characteristic
used to classify these organismis as fungi?
A. They are parasites.
B. They are unicelular.
C. They are prokaryotes,
D. They are heterotrophs
Answer:
D They are heterotrophs
Explanation:
All fungi are eukaryotes, and most are muticellular. Only the fungi called yeasts are unicellular. Fungi are heterotrophs.
HOPE THIS HELPS! HAVE A GREAT DAY!! :)
Mushrooms, bread moulds, and yeasts are classified as fungi based on the characteristics of being D. heterotrophs.
Explanation:An important characteristic used to classify mushrooms, bread moulds, and yeasts as fungi is that they are heterotrophs. Heterotrophs are organisms that obtain their nutrients by consuming other organic matter. In the case of fungi, they obtain their nutrients through extracellular digestion, breaking down organic materials externally and absorbing the nutrients.
This is in contrast to autotrophic organisms, which can produce their own food through processes like photosynthesis. Thus, are organisms that cannot produce their own food and rely on consuming other organisms or organic matter. They encompass a wide range of species, from herbivores that eat plants to carnivores that prey on other animals, and even decomposers that feed on dead organic material.
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Which state of matter expands when heated and is easy to compress? gas solid liquid
Answer:
gas
Explanation:
The gas molecules are far apart and as such, when heated they gain more kinetic energy thereby colliding with one another and with the wall of the container thereby exerting pressure and also they can be compressed by reducing the distance between between the molecules.
Matter is anything that is made up of atoms. Matter can be solid, liquid or gas. Out of solid, liquid and gas, gas is the matter that expand on heating and compressed on cooling.
What is matter?Matter is a substance that has some mass and can occupy some volume. The matter is mainly used in science. Anything around us that can be physically seen and touched are matter.
The intermolecular forces of attraction between the particles is highest in solid and lowest in gas. So, gas can be easily expand by increasing temperature. As the temperature increases the randomness between the particles also increases and hence particles move apart and expand. On decreasing pressure or temperature the randomness of particles decreases and hence particles comes closer and get compressed.
Thus out of solid, liquid and gas, gas is the matter that expand on heating and compressed on cooling
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Why is it important to have a control group in an experimental investigation?
Answer:to see how it effects
Explanation:
a control group provides a baseline for the experiment, shows how the independent variable influenced the experiment and influenced the outcome. a control group provides a comparison for the experiment
A miner working 260m below sea level opened a carbonated soft drink during a lunch break. To his surprise, the soft drink tasted rather "flat." Shortly afterward, the miner took an elevator to the surface. During the trip up, he could not stop belching. Why?
Answer:
Explanation:
The process of dissolving carbon dioxide in water and soft drinks is called carbonation, when there is a fizz, the carbon dioxide escapes from the water as an effervescence.
Due to the increase in atmospheric pressure in the mine, the ability of the dissolved carbon dioxide in the drink to escape is reduced, this accounts for why the drinks tastes flat.
When the miner gets to the ground surface, the atmospheric pressure becomes normal, so in the miner's stomach the carbon dioxide in the soft drink escapes and this results in the miner's continuous belching.
are alcohols with more than one hydroxyl group attached to a carbon sequence.
Polyhydroxyl alcohols
Molyhydroxyl alcohols
Hydroxyl alcohols
Hydroxide alcohols
Answer:
Polyhydroxyl alcohols
Explanation:
Whenever we have several C-OH bonds, we have a polyhydroxyl alcohol. For example, if we have just one alcohol group, that is, an R-OH group, then the naming is simple, say, we have EtOH, it's ethanol.
The problem becomes more complicated when we have several hydroxyl groups present in the alcohol. Let's say we have an ethane molecule and we replace the hydrogen atoms of carbon 1 and 2 with hydroxyl groups. In that case, we have 1,2-ethanediol. Similarly, we can have triols etc.
That said, we have poly (several) hydroxyl groups and we can generalize this to having polyhydroxyl alcohols.
Answer:
Explanation:
Polyhydroxyl alcohols
Which geological features MOST LIKELY prompted the development of the theory of plate tectonics?
A) river deltas
B) glacier fields
C) mountain ranges
D) tropical rainforests
Answer:
c.mountain ranges
Explanation:
scientists wondered how they where formed and came to the conclusion that they might be forced upward by movement of the earths crust
Answer:
mountain ranges
Explanation:
The world's tallest mountain ranges form when pieces of Earth's crust—called plates—smash against each other in a process called plate tectonics, and buckle up like the hood of a car in a head-on collision.
In the final chemical equation, HF and O2 are the products that are formed through the reaction between H2O and F2. Before you can add these intermediate chemical equations, you need to alter them by multiplying the
A.second equation by 2 and reversing the first equation.
B.first equation by 2 and reversing it.
C.first equation by (1/2) and reversing the second equation.
D.second equation by 2 and reversing it.
Answer:
Option A: Second equation by 2 and reversing the first equation
Explanation:
In order for the equation to become balanced by elements, dividing the second equation by 2 and then reversing the first equation to simplify the equation correctly is how you can then add the intermediate chemical equations. Took the test on edg and it was correct :)
In the final chemical equation, HF and O₂ are the products that are formed through the reaction between H₂O and F₂. Before you can add these intermediate chemical equations, you need to alter them by multiplying the second equation by 2 and reversing it and the correct option is option D.
What is a Chemical Equation?A chemical equation is the symbolic representation of a chemical reaction in the form of symbols and formulae, wherein the reactant entities are given on the left-hand side and the product entities on the right-hand side
They provide brief information about the amount of chemicals participating in a reaction.
In the given reaction,
Multiplying the second equation by 2 gives -
2H₂ + 2F₂ = 4HF
And then reversing it and adding to the first one gives -
4HF = 2H₂ + 2F₂
2H₂ + O₂ = 2H₂O
The hydrogens on both the sides cancel out and we are left with
4HF + O₂ = 2H₂O + 2F₂
Therefore, In the final chemical equation, HF and O₂ are the products that are formed through the reaction between H₂O and F₂. Before you can add these intermediate chemical equations, you need to alter them by multiplying the second equation by 2 and reversing it and the correct option is option D.
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1. (NH)2CrO-
a) Number of moles of H:
b) Number of moles of N:
2. Ag.SO.
a) Molar Mass:
b) Percent Composition of Ag:
c) Percent Composition of S:
d) Percent Composition of O:
Question:
1. (NH)2CrO
a) Number of moles of H:
b) Number of moles of N:
Answer:
a) Number of moles of H: 2
b) Number of moles of N: 2
Explanation:
The [tex](NH)_2CrO[/tex] is ammonium Chromate which is monoclinic and yellow Crystal that is formed due to the reaction of ammonium Hydroxide and ammonium di-chromate. It is used as catalyst, corrosion inhibitor as well as analytical inhibitors.
Question:
2. Ag.SO.
a) Molar Mass:
b) Percent Composition of Ag:
c) Percent Composition of S:
d) Percent Composition of O:
Answer:
a) Molar Mass: 155.93 Kg
b) Percent Composition of Ag: 69%
c) Percent Composition of S: 20.5%
d) Percent Composition of O: 10.2%
Explanation:
Molar mass = molar mass of Ag + molar mass of S + molar mass of O
=>107.87+32.06+16
=> 155.93 Kg
Percent Composition of Ag
= [tex]\frac{ \text{mass due to Ag}}{\text {total molar mass}} \times 100[/tex]
= [tex]\frac{107.87}{155.93} \times 100[/tex]
= 0.69 \times 100
= 69%
Percent Composition of S:
= [tex]\frac{ \text{mass due to S}}{\text {total molar mass}} \times 100[/tex]
=[tex]\frac{32.06}{155.93} \times 100[/tex]
= 0.205 \times 100
= 20.5%
Percent Composition of O:
= [tex]\frac{ \text{mass due to O}}{\text {total molar mass}} \times 100[/tex]
= [tex]\frac{16.00}{155.93} \times 100[/tex]
= 0.102 \times 100
= 10.2%
Consider the reaction of hydrogen gas with chlorine gas: H2 + Cl2 → 2HCl 4 molecules of hydrogen gas react with 6 molecules of chlorine gas. 4 molecules of hydrogen gas in this reaction will produce 8 molecules of HCl. 6 molecules of chlorine gas in this reaction will produce 12 molecules of HCl. Which statement BEST describes the role of hydrogen in this chemical reaction? A) Hydrogen is in excess. B) Hydrogen serves as a catalyst. C) Hydrogen is the limiting reactant. D) Hydrogen inhibits the rate of reaction.
Answer:
C. Hydrogen is the limiting reactant
Explanation:
Mole ratios are determined using the coefficients of the substances in the balanced chemical equation of reaction.
H2 + Cl2 -----> 2HCl
1mol:1mol 2mol
1mol of H2 reacts with 1 mole Cl2 to produce 2 moles of HCl.
From the above question, the amount of moles for H2 and for Cl2 are given as well as the amount of HCl each will produce.
We know the following now:
•1 mole of H2 gives 2 moles of HCl. •Thus, 4 molecules of H2 will produce 8 molecules of HCl.
•4 molecules of Cl2 will also produce 8 molecules of HCl.
•Likewise, 6 molecules of Cl2 will produce 12 molecules of HCl
•6 molecules of H2 will also produce 12 molecules of HCl BUT we do not have 6 molecules of H2!! We have only 4!! (From the question) .
This makes us short of H2 molecules. That is, the amount of H2 is in limited supply, which makes H2 the limiting reactant while Cl2 is in excess.
Therefore, we can only make 8 moles of HCl instead of 12 moles.
The best statement which describes the role of hydrogen in this chemical reaction is that hydrogen is the limiting reactant.
Answer:
C) the reactant in excess produces the greatest amount of product.
Explanation:
The statement that is NOT true is that the reactant in excess produce the greatest amount of product. The key to production is the limiting reactant. Reactants in excess have nothing to react with!
How many molecules are in 6.38g of H2O?
Answer:
x = 2.2*10^23 molecules of H2O
Explanation:
H = 1g
O = 16g
H2O = 1g*2 + 16g
H2O = 18g = 1 mol of H2O
18 g___1 mol of H2O
6.38g__ x = 0.354 mol of H2O
1 mol______6.22*10^23 molecules
0.354 mol__x = 2.2*10^23 molecules of H2O
1. A sample of aluminum absorbs 50.1 J of heat, upon which the temperature of the sample increases from 20.0°C to 35.5°C. If the specific heat of aluminum is 0.900 J/g- °C, what is the mass, in grams, of the sample?
Answer:
Mass of aluminium in sample = 3.591 g ≅ 3.6 grams
Explanation:
Given that, A sample of aluminum absorbs 50.1 J of heat, upon which the temperature of the sample increases from 20.0°C to 35.5°C.
the specific heat of aluminum is 0.900 J/g- °C
The relation between heat absorbed and change in temperature is given by, Q = msΔT.
where Q = heat absorbed
m = mass of the substance
s = specific heat of substance
ΔT = change in temperature
Now, in our case, Q = 50.1 J ; s = 0.900 J/g- °C; ΔT= 35.5-20 = 15.5°C
⇒ m = [tex]\frac{Q}{s(T_{2} -T_{1}) }[/tex]
⇒ m = [tex]\frac{50.1}{0.900(15.5)}[/tex] = 3.591 g ≅ 3.6 g
⇒ m ≅ 3.6 g
To calculate the mass of the aluminum sample, the heat absorbed was divided by the product of the specific heat capacity of aluminum and the change in temperature, resulting in a mass of approximately 3.59 grams.
Explanation:To find the mass of the aluminum sample, we'll use the following specific heat formula:
Q = mcΔT
Where:
Q is the heat absorbed, in joules (J)m is the mass of the substance, in grams (g)c is the specific heat capacity, in J/g°CΔT is the change in temperature, in °CFrom the question:
Q = 50.1 JΔT = 35.5°C - 20.0°C = 15.5°Cc for aluminum = 0.900 J/g°CRearranging the formula to solve for mass (m), we get:
m = Q / (cΔT) = 50.1 J / (0.900 J/g°C × 15.5°C)
Calculating the mass of the aluminum gives us:
m = 50.1 J / (13.95 J/g) ≈ 3.59 grams
The movement of thermal energy is controlled by _____. the laws of thermodynamics the specific heat of substances the production of greenhouse gases the circulation of the atmosphere
Answer:
I'm pretty sure that the answer is D.
4. What is one important assumption about the properties
ht assumption about the properties of an ideal gas under the kinetic-
molecular theory of gases?
a) All ideal gases have the same molar mass or molecular weight
b) Ideal gases all have the same partial pressure in a mixture of gases
c) The collision of ideal gas molecules is assumed to be perfectly elastic
d) Ideal gas properties have no effect on the behavior of ideal gases
5. Convert 34 degrees Celsius to temperature expressed as Kelvin.
a) -239. Kelvin
b) 134 Kelvin
c) 93.2 Kelvin
d) 307 Kelvin
4)
Under the kinetic-molecular theory of gases, one important assumption about the properties of an ideal gas is that the collision between gas molecules is perfectly elastic. This means that during collisions, there is no net loss or gain of kinetic energy. The gas molecules simply exchange energy, changing direction and speed, but the total energy of the system remains constant.
This assumption is crucial in understanding the behavior of ideal gases because it helps explain various gas properties, such as the relationship between pressure, volume, and temperature. The perfectly elastic collisions allow the gas molecules to freely move and exert pressure on the walls of the container.
5)
To convert degrees Celsius to Kelvin, you simply add 273.15 to the temperature in Celsius.
In this case, to convert 34 degrees Celsius to Kelvin, you would add 273.15:
34 degrees Celsius + 273.15 = 307.15 Kelvin
Therefore, the temperature expressed as Kelvin is 307 Kelvin.
An indicator of average kinetic energy is
temperature
o volume
O pressure
diffusion
A
ACK COR HELP
Answer:
Temperature is an indicator of average kinetic energy
Explanation:
Temperature of any substance is proportional to the average kinetic energy associated with the random motion of the atoms or molecules from which substances are formed.
Can you someone do my chem homework. I will pay $$$. I attached a question
Answer:
Acid-Base
Combustion
Combination
Decomposition
Explanation:
(1) KOH is acid and HBrO is a base which reacts to form water , thus it is an example of acid-base reaction.
(2) In the reactants Oxygen gas is used , whenever Oxygen comes in a reaction it is an example of Combustion reaction as the other reactant starts burning.
(3) Here two reactant combines to produce a single product , thus it is an example of Combustion Reaction.
(4) Here A single reactant decomposes to form two products in this reaction , thus it is an example of Decomposition Reaction.
If the latent heat of fusion for water is 333.4 J/g, how much heat is required to melt 170 grams of ice at 0 °C?
Answer:
The answer in the comments is wrong! It's not even an option on the test. Just letting people know.
Explanation:
• Which is temperature most directly
related to?
A. kinetic energy
B. mechanical energy
C. potential energy
D. thermal energy
Among the following, temperature is most directly related to the thermal energy. It is the energy acquired by body by the absorption of heat.
What is thermal energy?Thermal energy is a form of energy acquired by increasing the temperature of a body. Thermal energy of a body is directly proportional to the temperature of the body.
Kinetic energy is generated by virtue of motion of a body. Thus only a moving body will gain kinetic energy. For a moving body, as thermal energy increases, kinetic energy also increases.
Potential energy is generated by virtue of the position of an object which is in a height from the surface. The kinetic energy and potential energy together called as mechanical energy. They are related with the temperature.
However, the temperature is most directly related to thermal energy. Thus option D is correct.
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The solvent in a solution evaporates out over time, leaving behind the solute.
Why is this a mixture?
Select all that apply.
Distillation is a separation method that uses evaporation.
The solution is made up of the solvent and solute.
The solvent and solute are separated by physical means.
The solute does not evaporate because it is heavy.
Answer:
The solution is made up of the solvent and solute.
The solvent and solute are separated by physical means.
Explanation:
Any mixture must have a solvent and solute, or else it can't be classified as a mixture.
Additionally, I took a test and debated between the "distillation" and "physical means" problem, and got the "distillation" one wrong. It does make sense; evaporation is a physical mean through which the solvent is separates from the solute, even if it isn't caused by humans.
The 4th one just sounds absurd, and I would be shocked if it were correct.
Would it be C???? Please I need help
Answer: option C.
Explanation: aldehyde has a functional group R—CHO
What are the characteristics of cardiac muscle?
Answer:
Cardiac muscle cells are found only in the heart, and are specialized to pump blood powerfully and efficiently throughout our entire lifetime. Four characteristics define cardiac muscle tissue cells: they are involuntary and intrinsically controlled, striated, branched, and single nucleated.
Explanation:
Cardiac muscle is a specialized type of muscle tissue found only in the heart. It has a striated appearance, is under involuntary control, contains intercalated discs for coordinated contraction, and is highly endurance.
Cardiac muscle is a specialized type of muscle tissue found only in the heart. It has unique characteristics that allow it to efficiently contract and relax, enabling the heart to pump blood throughout the body.
Some key characteristics of cardiac muscle include:
Striated appearance: Cardiac muscle has a striped or striated appearance due to the arrangement of contractile proteins.Involuntary control: Unlike skeletal muscle, cardiac muscle is under involuntary control, meaning we cannot consciously control its contractions.Intercalated discs: These structures are found between adjacent cardiac muscle cells and help transmit electrical impulses, ensuring that the heart contracts as a coordinated unit.Endurance: Cardiac muscle is highly resistant to fatigue and can maintain contractions for extended periods of time.Learn more about Characteristics of Cardiac Muscle here:https://brainly.com/question/34360003
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beryllium be and chlorine cl form a binary ionic compound with a one to two ratio of beryllium ions to chloride ions. the formular for the compound is?
Answer: BeCl2
Explanation:
Be + Cl2 —> BeCl2
Answer:BeCl2
Explanation:
Reaction between Beryllium (Be) a di-ionic cation and Chlorine a mono-ionic forms BeCl2.
Below is an electron dot diagram drawn by a student. What was the student's error in creating this diagram
if any?
[A13+]; [:0:2-12
a
There should be 6 aluminum atoms and 4 oxygen atoms.
b
The charges did not transfer from the cation to the anion to become subscripts correctly.
C There should be five atoms of each element as suvbscripts.
D There was no error.
Answer:
The charges did not transfer from the cation to the anion to yield the correct subscripts
Explanation:
First of all, we see that we have [tex]Al^{3+}[/tex] and [tex]O^{2-}[/tex] in this ionic compound. Since this is a substance, it has a net charge of 0. This means the charge of a cation should be balanced by the charge of the anion.
The lowest common multiple of 3 and 2 is 6, meaning we need:
\frac{6}{3}=2 [tex]Al^{3+}[/tex] cations;\frac{6}{2}=3 [tex]O^{2-}[/tex] anions;Oxygen needs a total of 8 valence electrons, as it's the anion and it gains electrons to obtain an octet. We have 3 oxygen anions in total. Normally, oxygen has 6 electrons, so it needs to gain 2 electrons for each of the 3 oxygen atoms, that is, gain a total of 6 electrons. Those 6 electrons are donated by two aluminum atoms (each having 3 valence electrons), so two aluminum cations are balanced by three oxygen anions.
The Lewis diagram is correct, as it shows an octet on oxygen. We also have the correct charges. The subscripts, though, have to be 2 and 3 for Al and O respectively.