the percent composition of calcium is ?
Answers
Answer:
36%
Explanation:
This is the answer on edmentum/plato. Hope this helps. Jesus loves YOU!
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2. Se combinan 40 g de SO2 y 25 g de O2 determine el porcentaje en masa del exceso con respecto a su masa inicial. P.A. (S = 32; O = 16) SO2 + O2 SO3
Answers
Answer:
60%
Explanation:
En la reacción:
2SO₂ + O₂ → 2SO₃
Donde 2 moles de SO₂ reaccionan por mol de O₂.
El peso atómico del SO₂ es:
1S = 32g/molₓ1 = 32g/mol
2O = 16g/molₓ2 = 32g/mol
SO₂ = 32g/mol + 32g/mol = 64g/mol
Y el peso atómico de O₂ es:
2O = 16g/molₓ2 = 32g/mol
Las moles de SO₂ y O₂ son:
SO₂: 40g ₓ (1mol / 64g) = 0.625 moles
O₂: 25g ₓ (1mol / 32g) = 0.7813 moles
Para una completa reacción de SO₂ se necesitan:
0.625 moles SO₂ ₓ (1mol O₂ / 2 mol SO₂) = 0.3125 moles de O₂
Así, las moles en exceso de O₂ son:
0.7813 moles - 0.3125 moles = 0.4688 moles O₂
En gramos:
0.4688 moles O₂ ₓ (32g / mol) = 15g O₂ están en exeso.
El porcentaje en exceso es:
15g / 25g ₓ 100 =
60%a Disscuss different types of frictions b Explain friction is necessary evil c Why should friction be reduced
Answers
The Types of Friction are;
Static FrictionKinetic FrictionRolling FrictionWhat is the frictionsStatic Friction is a type of friction that stops objects from moving when a force is added and they aren't moving.
Kinetic friction happens when two things are rubbing against each other while they are moving. It tries to stop things from moving too fast.
Rolling friction happens when something rolls on a surface. Like a wheel moving on the ground. When objects move, it is easier for them to keep going because rolling friction (friction when something rolls) is usually less than kinetic friction (friction when something slides).
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\({\huge{\underline{\underline{\tt{\green{Answers}}}}}}\)
______________________________________
Answer a.The different types of friction are:
static frictionsliding frictionrolling frictionfluid friction.______________________________________
Answer b.Friction is often called a necessary evil because it can be both helpful and harmful. On the one hand, friction is what allows us to walk, drive, and write, and it prevents objects from slipping and sliding out of our hands. On the other hand, friction can cause wear and tear on machines and vehicles, generate heat that can damage materials, and slow down or stop moving objects.
______________________________________
Answer c.Friction should be reduced in certain situations to increase efficiency and reduce wear and tear. For example, reducing friction in engines and machines can increase fuel efficiency and decrease maintenance costs. However, friction should not be reduced in situations where it is necessary for safety, such as in car brakes or shoes.
______________________________________
A loan is being repaid by 2n level payments, starting one year after the loan. Just after the nth payment the borrower finds that she still owe (3/4) of the original amount. What proportion of the next payment is interest?
Answers
A loan is being repaid by \(2n\) level payments, starting one year after the loan. Just after the nth payment the borrower finds that she still owe \((3/4)\)of the original amount. The proportion of the next payment that is interest is \(1 - 2 * (1 - (1 + r)^{(-n)}) / (3 * (1 - (1 + r)^{(-2n)})).\)
Let \(P\) be the original amount of the loan, and let \(x\) be the level payment made at each of the \(2n\) payments. Then the total amount repaid will be \(2nx\). We know that after \(n\) payments, the borrower still owes \((3/4)P\).
Therefore, the amount repaid after \(n\) payments is \((P - (3/4)P) = (1/4)P\). This means that the total amount repaid after the remaining \(n\) payments is \((3/4)P\).
We can set up an equation using the formula for the present value of an annuity:
\(P = x * (1 - (1 + r)^{(-2n)}) / r\)
where \(r\) is the interest rate per payment period (which we will assume is constant), and the first payment is due one year after the loan.
After \(n\) payments, the outstanding balance is \((3/4)P\). We can use the same formula to find the present value of the remaining \(n\) payments, but with \(P\) replaced by \((3/4)P\):
\((3/4)P = x * (1 - (1 + r)^{(-n)}) / r\)
We can rearrange this equation to solve for \(x\):
\(x = (3/4)P * r / (1 - (1 + r)^{(-n)})\)
Now we need to find the proportion of the next payment that is interest. The interest component of each payment is the difference between the total payment and the amount of principal being repaid. The total payment is \(x\), and the amount of principal being repaid is:
\((3/4)P * r / (1 - (1 + r)^{(-n)})\).
So the proportion of the next payment that is interest is:
Interest component / Total payment
\(= (x - (3/4)P * r / (1 - (1 + r)^{(-n)})) / x\\= 1 - (3/4)P * r / (x * (1 - (1 + r)^{(-n)}))\\= 1 - (3/4)P / (2nx * (1 - (1 + r)^{(-n)}))\\\)
We can simplify this expression by using the equation we derived earlier for \(x\):
\(1 - (3/4)P / (2nx * (1 - (1 + r)^{(-n)}))\\= 1 - (3/4)P / ((3/2)P * r / (1 - (1 + r)^{(-n)}) * (1 - (1 + r)^{(-2n)}))\\= 1 - 2 * (1 - (1 + r)^{(-n)}) / (3 * (1 - (1 + r)^{(-2n)}))\)
So the proportion of the next payment that is interest is:
\(1 - 2 * (1 - (1 + r)^{(-n)}) / (3 * (1 - (1 + r)^{(-2n)})).\)
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How many moles of carbon are in the sample?
Answers
Answer:
12.01 grams per mole
Explanation:
theres no sample or example so if theres grams of Carbon, convert it to moles using 12.01g/mol
Help me pls!
What is heliuim?
Answers
Answer:
it's a chemical Element
Explanation:
symbol He
atomic number 2.
Which is which, acid or base?
Answers
Answer:
HCI - BASE
KOH - ACID
H2SO4 - ACID
H30 + :- BASE
NAOH - ACID
Describe how the size of the sun compares to the sizes of the other stars.
Answers
Answer:
The sun's circumference is about 2,713,406 miles (4,366,813 km). It may be the biggest thing in this neighborhood, but the sun is just average compared to other stars. Betelgeuse, a red giant, is about 700 times bigger than the sun and about 14,000 times brighter.
Explanation:
looked it up
Explanation:
The sun's circumference is about 2,713,406 miles (4,366,813 km). It may be the biggest thing in this neighborhood, but the sun is just average compared to other stars. Betelgeuse, a red giant, is about 700 times bigger than the sun and about 14,000 times brighter
what mass of aluminum will produce 3128 j of energy when heated 39 degrees celsius? the specific heat capacity of aluminum is 0.903 j/g oc.
Answers
The required mass of aluminium is 247 g.
The heat energy of a substance, like a metal component, increases whenever the temperature of that material rises. The quantity of heat energy needed by a specific substance (of unit mass) to cause a 1 °C shift in either direction is generally what we are interested in. The desired material's specific heat capacity may provide us with this knowledge, which makes it the most beneficial and strikingly preferred quantity in scientific studies.
Given:
Q = 3128 J (Heat energy produced by the given mass of aluminium)
T(i) = 25 °C (Initial temperature of aluminium)
T(f) = 39 °C (Final temperature of aluminium)
c = 0.903J/g °C (Specific heat capacity of aluminium)
m = required mass of aluminium
As a result, aluminum produces amount of heat energy:
Q =mcΔT
m = Q/cΔT = Q/c (T(f) - T(i))
= 3128 J/0.903 J/g°C X (39 °C - 25 °C)
= 247 g
Therefore, required mass of aluminium is 247 g.
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What functional groups are present in all amino acids?
Answers
Answer:
All amino acids have an amino group (-NH2) and a carboxyl group (-COOH).
Their third associated functional group, side chains known as R groups, which are attached to each of them, thus serves to identify them from other types of amino acids. The R group has the largest diversity among the functional groups of amino acids, which are shown below.
What function group involve in formation of amino acid?The building components of polypeptides and proteins, amino acids are crucial for the regulation of metabolic pathways, gene expression, and cell signal transduction.
Amino acids can be divided into four groups based on their charge, including nonpolar, polar, negatively charged, and positively charged.
A single organic amino acid molecule has a distinct side chain in addition to the two functional groups, amine and carboxyl.
Therefore, All amino acids have an amino group - and a carboxyl group -.
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The Sun keeps all of the planets orbiting it because _____.
A. he Law of Ellipses states that the planets orbit the Sun in circular patterns
b. the Law of Universal Gravitation states that an increase in mass causes an increase in gravitational force
C. the Law of Harmonies states that the motion of the planets will not stop unless an outside force is applied
D. the Law of Equal Areas states that planets sweep equal areas in equal periods of time around the Sun
Answers
Answer:
a. because of how the earth circulates around the sun.
Consider the Sy2 reaction between 1-bromo-2-methylpropane and methoxide. Add curved arrows to the starting materials to
indicate the flow of electrons. Draw the product species to show the balanced equation, including nonbonding electrons and
formal charges.
H2
Н.С.
Br:
-CH3
product
n Shot
07.42 PI
H
+
CH3
n Shot
.07.13 P1
Draw curved arrows.
Draw the products. The bromide ion has been drawn
for you.
Draw
Select
Rings
More
Erase
Question"
Select
Draw
Rings
More
Erase
h Shot
10.36 PI
///
С
Br
O
С
Br
o
n Shot
-2
Answers
Answer:
sdfs
Explanation:
dfssdf
When 1-bromo-2-methylpropane is reacted with methoxide the same product 1-methylprop-2-ene is obtained. This reaction is attached in image below:
What is SN₂ reaction ?The SN2 reaction is a nucleophilic substitution reaction that breaks one bond while forming another. The rate-determining step of the reaction involves two reacting species. SN2 is an abbreviation for Substitution Nucleophilic Bimolecular.
The reaction is bimolecular because two molecules are present in the transition state, as indicated by the number 2 in the SN2 symbol. As a result, the rate of the reaction is affected by the concentrations of both the nucleophile and the substrate.
The SN2 reaction is a nucleophilic substitution with two components in the rate determining step. -SN2 reactions are bimolecular, with bond-forming and bond-breaking steps occurring simultaneously. There is no intermediate in -SN2 reactions.
Thus, product 1-methylprop-2-ene is obtained.
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(89 point )Use the diagram to determine the difference between freezing rain and sleet. (Freezing rain melts in warm air and then freezes on cold surfaces while sleet refreezes before it hits the surface of Earth) ( Sleet is wet and rain is frozen) (Freezing rain melts in warm air then refreezes before it reaches the surface, while sleet falls wet and freezes on the surface) don't get me just the answer. give me poof
Answers
Answer:
it is actually 45 points
Explanation:
Freezing rain melts in warm air and then freezes on cold surfaces while sleet refreezes before it hits the surface of Earth. Sleet is wet and rain is frozen. Freezing rain melts in warm air then refreezes before it reaches the surface, while sleet falls wet and freezes on the surface. you basically wrote out your answer yourself and you´re proof, i gooogled it, lol
Answer:
Freezing rain melts in warm air and then freeze then refreeze before it reaches the surface
Which best describes a neutralization reaction?
a reaction between an acid and a base
a reaction between two acids
a reaction between a base and a salt
a reaction between two salts
Answers
A reaction between an acid and a base describes a neutralization reaction. Therefore, option (a) is correct.
What is a neutralization reaction?A neutralization reaction can be described as a chemical reaction in which an acid and base react with each other to produce salt and water.
The acidic strength of the reactant gives the pH of the neutralized solution. When a strong acid solution will react with a strong base the formed salt can be neither acidic nor basic, it will be neutral. For example, when HCl (a strong acid) reacts with NaOH (a strong base), the resulting salt is sodium chloride (NaCl) and water.
HCl + NaOH → NaCl + H₂O
When a strong acid solution will react with a weak base, then the formed salt will be acidic in nature. When a strong base solution will react with a weak acid then the formed salt will be basic in nature and decides the pH level of the solution.
Therefore, the reaction between the acid and base can best describe a neutralization reaction.
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A sample of gas occupies 300 mL at 100K. What is its volume when the
temperature is increased to 200K? (P and n= constant)
Answers
If the temperature of the sample of gas increases to the given value, the volume also increases to 600mL.
What is Charles's law?
Charles's law states that "the volume occupied by a definite quantity of gas is directly proportional to its absolute temperature.
It is expressed as;
V₁/T₁ = V₂/T₂
Given the data in the question;
Initial temperature of gas T₁ = 100KInitial volume of gas V₁ = 300mLFinal temperature T₂ = 200KFinal volume V₂ = ?V₁/T₁ = V₂/T₂
V₂ = V₁T₂ / T₁
V₂ = ( 300mL × 200K ) / 100K
V₂ = 60000mLK / 100K
V₂ = 600mL
Therefore, if the temperature of the sample of gas increases to the given value, the volume also increases to 600mL.
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HELP ASAP
Explain the factors that affect the sounds we hear. Support your response with evidence and scientific reasoning including relationship between wave properties and sound characteristics you explored in this . In your response you should each of the following terms:
Loudness/Volume Pitch Frequency Amplitude
Answers
Answer:
The loudness of sound is determined, in turn, by the intensity, or amount of energy, in sound waves. The unit of intensity is the decibel (dB) Intensity of sound results from two factors: the amplitude of the sound waves and how far they have traveled from the source of the sound.
Explanation:
what is the percent composition of salicylic acid?
Answers
The percent composition of salicylic acid is C7H6O3, or 60.87%C, 4.4%H, and 34.75%O
Metals are malleable. Malleable means metals are ____.
Question 1 options:
shiny
good conductors of heat
thick and hard to see through
easily bent or shaped
Answers
Answer:
easily bent or shaped
Explanation:
malleable means to be able to be bent or sualef without breaking
metals are malleable
hope this helps :)
5 A student finds the mass and volume of four mystery liquids. Liquid Mass (9) Volume (mL) W 5 5 х 6 2 Y 2. 1 Z 2 00 No The student knows that the density of water is 1 g/mL. Which of the four mystery liquids can be correctly identified as water? Density = Mass / Volume A w B X
Answers
Answer:
A. W
Explanation:
we know the equation Density = mass/volume ( D = g/mL ).
we know that the density of water is 1 g/mL.
Liquid W = 5g/5 mL = 1 g/mL
Liquid X = 6g/2 mL = 3 g/mL
Liquid Y = 2g/1 mL = 2 g/mL
Liquid Z = 8g/.2 mL = 40 g/mL
Answer: A. W because that liquid has the same density as water.
Hope this helps you.
Click on the diagram to choose which atom is more reactive.
Answers
Answer:
Second graph is more reactive.
Explanation:
I just did the lesson myself, chose the first graph, and obviously got it wrong.
Therefore I can tell you with 100% certainty that the correct answer is graph #2 in this case. Hope this helps.
A 10 liter tank of CO2 is at a pressure of 3.5 atm and a temperature of
25°C. How many moles of CO2 are in the tank?
Answers
The moles of CO2 are in the tank is mathematically given as
n=1.431
What are moles of CO2 are in the tank?Question Parameters:
A 10-liter tank of CO2 is at a pressure of 3.5 atm and a temperature of
25°C.
Generally, the equation for the ideal gas is mathematically given as
PV=nRT
Therefore
n=PV/RT
n=354.638kpa*10/8.314 J/mol·K *298k
n=1.431
In conclusion, moles of CO2 is in the tank is
n=1.431
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What temperature is equivalent to -22°F?
Answers
liquidus line separates which of the following combinations of phase fields? a) alpha and alpha+beta b) Liquid and Liquid + alpha c) alpha and Liquid + alpha d) Liquid +alpha and alpha+beta
Answers
The liquidus line separates the following combinations of phase fields: Liquid and Liquid + alpha. The correct option is b.
What is a phase field? A phase field is a technique for representing the microstructure of materials. It is used in materials science, mathematics, and computer science to simulate and study the behavior of materials in the solid and liquid phases. It is a multi-component field that contains information on the concentration of various components, their phase, and the local temperature, as well as other relevant variables.
The liquidus line is defined as the boundary between the liquid phase field and the field that includes both the liquid and the alpha phase. As a result, the liquidus line separates the following combinations of phase fields: Liquid and Liquid + alpha.
So, the correct option is b) Liquid and Liquid + alpha.
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Report the number of significant figures in each of the following values
Answers
Answer:
1.
A. 3 significant figures
B. 4 significant figures
C. 3 significant figures
D. 2 significant figures
E. 2 significant figures
F. 2 significant figures
select the periodic table tab, and look at the second row, or period, of the table. how does this row reflect the subshells of the second shell?
Answers
The second row of the periodic table reflects second energy level which corresponds to 2 subshells obtained in this row.
Periodic table is arranged in rows and columns, the columns represents the group of the elements and the rows represents the energy level of the elements.
When we observe the second row of the periodic table, we will notice the following;
The second row of the periodic table corresponds to second energy level.The maximum number of shells is 2.The number of electrons in the second subshell increases from left to rightThe maximum number of electrons in the second subshell is 8, which is found in group zero (noble gases group).Thus, we can conclude that the second row of the periodic table reflects second energy level which corresponds to 2 subshells obtained in this row.
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Answer:
second row of the periodic table reflects second energy level which corresponds to 2 subshells obtained in this row.
Explanation:
deadly amounts of carbon monoxide can be released from which of the following?
Answers
Deadly amounts of carbon monoxide can be released from various sources such as:
incomplete combustion of fuelspoorly maintained or malfunctioning appliancesmotor vehicle exhaust. What are the sources of carbon monoxide?Besides the ones that have been mentioned, other common sources of carbon monoxide include gas or coal-burning appliances like furnaces, water heaters, and stoves. Additionally, gas-powered generators, charcoal grills, and propane heaters can also emit dangerous levels of carbon monoxide. Vehicle exhaust from running cars in enclosed spaces, such as garages, can lead to a buildup of this hazardous gas.
Carbon monoxide is colorless, odorless, and tasteless, making it difficult to detect, which increases the risk of poisoning. Proper maintenance of appliances, adequate ventilation, and the use of carbon monoxide detectors can help prevent exposure and ensure a safer environment.
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If a student puts a dialysis tube with 15% salt in it, into a beaker that has only 5% salt, what would happen to the movement of water?
Answers
Answer:
- Water from beaker will move to the tube
Explanation:
Total percentage of water in the beaker;
\( = { \tt{100\% - 5\%}} \\ = { \tt{95\%}}\)
Total percentage of water in dialysis tube;
\({ \tt{ = 100\% - 15\%}} \\ = { \tt{85\%}}\)
So, there is much water concentration in the beaker than the dialysis tubing, this causes a determined percentage of water to diffuse to the tubing, and determined percentage of salt to move from tubing to the beaker.
Percentage of water moving to tubing;
\({ \tt{ = 95\% - 85\%}} \\ = { \tt{10\%}}\)
Percentage of salt moving from tubing to beaker
\({ \tt{ = 15\% - 5\%}} \\ { \tt{ = 10\%}}\)
a sealed vessel contains 50% oxygen, 10% carbon dioxide, and 40% nitrogen gas. the total pressure of the mixture is 5 atmospheres. what is the partial pressure of carbon dioxide?
Answers
The partial pressure of carbon dioxide in the sealed vessel is 0.5 atm.
To find the partial pressure of carbon dioxide, we need to use the partial pressure formula, which states that the partial pressure of a gas is equal to the total pressure of the mixture multiplied by the mole fraction of that gas.
First, we need to find the mole fraction of carbon dioxide. The mole fraction is the number of moles of a gas divided by the total number of moles of all gases in the mixture.
Assuming we have 100 molecules of gas in the vessel, we can calculate the number of moles of each gas as follows:
- Oxygen: 50 molecules / 100 molecules = 0.5 moles
- Carbon dioxide: 10 molecules / 100 molecules = 0.1 moles
- Nitrogen: 40 molecules / 100 molecules = 0.4 moles
The total number of moles is 0.5 + 0.1 + 0.4 = 1 mole.
Now, we can calculate the mole fraction of carbon dioxide:
- Mole fraction of carbon dioxide = 0.1 moles / 1 mole = 0.1
Finally, we can use the partial pressure formula to find the partial pressure of carbon dioxide:
- Partial pressure of carbon dioxide = 5 atm x 0.1 = 0.5 atm
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. 11 gallons of gasoline for $26.29
or 6 gallons of gasoline for $14.45?
Answers
Answer:
6 gallons of gasoline for $14.45 is the best price
Explanation:
26.29/11=2.39 $ per gallon
14.45/11=1.31 $ per gallon
Calculate the average atomic mass of the mystery element given the isotopic data below.
Sample size: Isotope #1 85 - particles, Isotope #2 - 90 particles, Isotope #3 - 45 particles
Masses: Isotope #1 total mass = 1630 amu, Isotope 2 total mass = 1950 amu, Isotope #3 total mass = 1030 amu
Answers
The average atomic mass of the mystery element : 1637.88 amu
Further explanationThe elements in nature have several types of isotopes
Isotopes are elements that have the same Atomic Number (Proton)
Atomic mass is the average atomic mass of all its isotopes
In determining the mass of an atom, as a standard is the mass of 1 carbon-12 atom whose mass is 12 amu
An atomic mass unit = amu is a relative atomic mass of 1/12 the mass of an atom of carbon-12.
The 'amu' unit has now been replaced with a unit of 'u' only
Mass atom X = mass isotope 1 . % + mass isotope 2.% ..
Isotope #1 - 85 particles, Isotope #2 - 90 particles, Isotope #3 - 45 particles, so total particles :
\(\tt 85+90+45=220~particles\)
% particles :
Isotope #1\(\tt \dfrac{85}{220}=0.386\)
Isotope #2\(\tt \dfrac{90}{220}=0.409\)
Isotope #3\(\tt \dfrac{45}{220}=0.205\)
The average atomic mass of the mystery element
\(\tt =0.386\times 1630+0.409\times 1950+0.205\times 1030\\\\=\boxed{\bold{1637.88}}\)
Based on the chemical equation, use the drop-down menu to choose the coefficients that will balance the
chemical equation: 1
DH₂0-DH₂ + O₂
Intro
Lot 10
Done
Answers
Answer:
D = 2
2H₂0 → 2H₂ + O₂
Explanation:
I'll assume that "DH₂0-DH₂ + O₂" is meant to read:
DH₂0 → DH₂ + O₂
Water decomposes into oxygen (O2) and hydrogen (H2) molecules.
We are to find a vale of D that will balance this equation.
DH₂0 → DH₂ + O₂
Count the atoms on both sides of the equation, assuming D is 1 at this point:
(D = 1)
Element Reactant Product Balanced?
H 2 2 Yes
O 1 2 No
We need an additional oxygen atom on the reactant side, so lets try D=2:
2H₂0 → 2H₂ + O₂
Element Reactant Product Balanced?
H 4 4 Yes
O 2 2 Yes
The equation is balanced for D = 2:
2H₂0 → 2H₂ + O₂