Hey
Matter can neither be created nor destroyed.
Explanation:
This is the law of conservation of matter (mass). One can prove this by performing a simple experiment at home.
Have a great day
2 M n O 2 + 4 K O H + O 2 + C l 2 → 2 K M n O 4 + 2 K C l + 2 H 2 O , there are 100.0 g of each reactant available. Which reactant is the limiting reagent?
Answer:
The limiting reactant is KOH.
Explanation:
To find the limiting reactant we need to calculate the number of moles of each one:
[tex]\eta = \frac{m}{M}[/tex]
Where:
η: is the number of moles
m: is the mass
M: is the molar mass
[tex] \eta_{MnO_{2}} = \frac{100.0 g}{86.9368 g/mol} = 1.15 moles [/tex]
[tex] \eta_{KOH} = \frac{100.0 g}{56.1056 g/mol} = 1.78 moles [/tex]
[tex] \eta_{O_{2}} = \frac{100.0 g}{31.998 g/mol} = 3.13 moles [/tex]
[tex] \eta_{Cl_{2}} = \frac{100.0 g}{70.9 g/mol} = 1.41 moles [/tex]
Now, we can find the limiting reactant using the stoichiometric relation between the reactants in the reaction:
[tex]\eta_{MnO_{2}} = \frac{\eta_{MnO_{2}}}{\eta_{KOH}}*\eta_{KOH} = \frac{2}{4}*1.78 moles = 0.89 moles[/tex]
We have that between MnO₂ and KOH, the limiting reactant is KOH.
[tex]\eta_{O_{2}} = \frac{\eta_{O_{2}}}{\eta_{Cl_{2}}}*\eta_{Cl_{2}} = \frac{1}{1}*1.41 moles = 1.41 moles[/tex]
Similarly, we have that between O₂ and Cl₂, the limiting reactant is Cl₂.
Now, the limiting reactant between KOH and Cl₂ is:
[tex]\eta_{KOH} = \frac{\eta_{KOH}}{\eta_{Cl_{2}}}*\eta_{Cl_{2}} = \frac{4}{1}*1.41 moles = 5.64 moles[/tex]
Therefore, the limiting reactant is KOH.
I hope it helps you!
Answer:
KOH is the limiting reactant
Explanation:
Step 1: Data given
Mass of MnO2 = 100 grams
Mass of KOH = 100 grams
Mass of O2 = 100 grams
Mass of Cl2 = 100 grams
Molar mass of MnO2 = 86.94 g/mol
Molar mass of KOH = 56.11 g/mol
Molar mass of O2 =32.0 g/mol
Molar mass of Cl2 = 70.9 g/mol
Step 2: The balanced equation
2MnO2 + 4KOH + O2 + Cl2 → 2 KMnO4 + 2KCl + 2H2O
Step 3: Calculate moles
Moles = mass / molar mass
Moles MnO2 = 100 grams / 86.94 g/mol
Moles MnO2 =1.15 moles
Moles KOH = 100 grams / 56.11 g/mol
Moles KOH = 1.78 moles
Moles O2 = 100 grams / 32.0 g/mol
Moles O2 = 3.125 moles
Moles Cl2 = 100 grams / 70.9 g/mol
Moles Cl2 = 1.41 moles
Step 4: Calculate the limiting reactant
For 2 moles MnO2 we need 4 moles KOH and 1 mol O2 and 1 mol Cl2 to produce 2 moles KMnO4, 2 moles KCl and 2 moles H2O
KOH is the limiting reactant. It will completely be consumed (1.78 moles). The other reactants are in excess.
There will react:
MnO2: 1.78/ 2 = 0.89 moles
O2: 1.78/4 = 0.445 moles
Cl2: 1.78/4 = 0.445 moles
There wil remain:
MnO2: 1.15 - 0.89 = 0.26 moles
O2: 3.125 - 0.445 = 2.68 moles
Cl2: 1.41 - 0.445 = 0.965 moles
KOH is the limiting reactant
What mass of chromium would be produced from the reaction of 57.0 g of potassium with 199 g of chromium(II) bromide according to the following reaction? 2 K + CrBr2 2 KBr + Cr *
Answer:
38g of Cr
Explanation:
Step 1:
The balanced equation for the reaction:
2K + CrBr2 —> 2KBr + Cr
Step 2:
Determination of the masses of K and CrBr2 that reacted and the mass of Cr produced from the balanced equation.
This is illustrated below:
Molar mass of K = 39g/mol
Mass of K from the balanced equation = 2 x 39 = 78g
Molar Mass of CrBr2 = 52 + (80x2) = 212g
Mass of CrBr2 from the balanced equation = 1 x 212 = 212g
Molar Mass of Cr = 52g/mol
Mass of Cr from the balanced equation = 1 x 52 = 52g
From the balanced equation above,
78g of K reacted with 212g of CrBr2 to produce 52g of Cr.
Step 3:
Determination of the limiting reactant.
This is illustrated below:
From the balanced equation above,
78g of K reacted with 212g of CrBr2.
Therefore, 57g of K will react with = (57 x 212)/78 = 154.92g of CrBr2.
From the above calculation, we can see that a lesser mass (i.e 154.92g) than what was given ( i.e 199g) of CrBr2 is needed to react completely with 57g of K. Therefore, K is the limiting reactant and CrBr2 is the excess reactant.
Step 4:
Determination of the mass of Cr produced by the reaction.
In this case, the limiting reactant will be use because it will give the maximum yield of Cr as all of it is used up in the reaction process. The limiting reactant is K and the mass of Cr produced is obtained as follow:
From the balanced equation above,
78g of K reacted to produce 52g of Cr.
Therefore, 57g of K will produce = (57 x 52)/78 = 38g of Cr.
Therefore, 38g of Cr is produced from the reaction.
ionic compounds conduct electricity in the solid state true or false
In solid form, ionic compounds do not conduct electricity. Ionic compounds will conduct electricity when melted to their liquid state. This is due to the electrons being locked in place when in solid form, but liquid form allows for the electrons to move freely.
why is the international space station in orbit
Answer:
The ISS provides a location in the relative safety of low Earth orbit to test spacecraft systems that will be required for long-duration missions to the Moon and Mars.
Explanation:
1.
__________ are the most organized state of matter.
Solids
Liquids
Gases
2.
States of matter change when ________ is added or removed.
Plasma
Energy
3.
Which state of matter has the most movement of its particles?
Solid
Liquid
Gas
Solids are the most organized state of matter. States of matter change when energy is added or removed. Gas is the state of matter has the most movement of its particles.
What are the states of matter?The states of matter are the different forms of the matter in which it can exist. They are solids, liquids and gases. Solids are the states of matter in which molecules are very near to each other. They have fixed shape and volume. Liquids is the states of matter in which molecules are a little far from each other. They have different shape and fixed volume. Gas is the states of matter in which molecules are a very far from each other. They have different shape and different volume.
There are two more states of matter which are called as Plasma, Bose Einstein Condensate.
Plasma have highest energy and Bose Einstein Condensate have lowest energy.
Therefore, Solids are the most organized state of matter. States of matter change when energy is added or removed. Gas is the state of matter has the most movement of its particles.
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14. Which of the following statement is correct?
(a) Materials existing as liquids at room temperature have their melting and boiling points lower than
that of room temperature.
(b) The phenomenon involving the transition of a substance from solid to liquid state is called
sublimation
(c) To convert a temperature on the Celsius scale to Kelvin scale, subtract 273 from the given
temperature
(d) The density of ice is less than that of water.
Answer:
(d)
Explanation:
The correct statement is the density of ice is less than that of water. Therefore, option D is correct.
Why is the density of ice less than that of water?Water has a higher density than ice because its molecules are more tightly packed. Don't be fooled by the fact that ice is a solid. Water expands as it freezes. As a result, ice has a higher volume than water.
Because the orientation of hydrogen bonds causes molecules to push farther apart, ice is less dense than water.
Other liquids' solid states are denser because the molecules pack together tightly as the kinetic energy (temperature) decreases. Although the hydrogen bonds in water ice are strong, their orientation causes molecules to push apart, lowering density.
Thus, option D is correct.
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Heat that is transferred by the movement of currents within fluid is called
Answer:Convection is heat transfer by the movement of currents within a fluid. During convection, heated particles of fluid begin to flow. This flow transfers heat from one part of the fluid to another. Heat transfer by convection is caused by differences of temperature and density within a fluid
How do stars contribute to the elements inside you?
Answer:
yes
Explanation: i took the test on this
Can someone answer #6 also please show work!
Answer:
4.6 mph
Explanation:
11.5 times 24=276 which means the boat traveled 276 miles in one day,which would make it where you take 276 and divide by 60 which is the amount of minutes in one day.This gives you the answer of 4.6mph.
This is not guaranteed to be correct.
Research to find out what Molarity (mol/L) is measuring includes citation. What is the common word used to describe the measure of Molarity in the simulation?
Answer:
Molarity is a unit for expressing the concentration of a solution
Explanation:
Molarity is used to express the concentration of a solution. Also known as molar concentration, molarity is the number of moles of solute (the material dissolved) per liter of solution. It measures the concentration of a solution. The molarity of a solution is calculated by taking the moles of solute and dividing by the liters of solution. Hence, Molarity (M) indicates the number of moles of solute per liter of solution (moles/Liter) and is one of the most common units used to measure the concentration of a solution.
Molarity is commonly expressed as molar. Molar also refers to the unit of concentration called molarity, which is equal to the number of moles per liter of a solution. In chemistry, the term most often refers to molar concentration of a solute in a solution. Molar concentration unit also implies the units mol/L or M.
What pH does an acid have?
Answer:
The pH scale ranges from 0 to 14. A pH of 7 is neutral. A pH less than 7 is acidic. A pH greater than 7 is basic
Explanation:
Explain the effects that different frequencies of electromagnetic radiation have when absorbed by matter.
As the frequency of the radiation increases further, into the visible light spectrum, it can cause electronic transitions in atoms and molecules, leading to the emission of light and other optical effects.
What is electromagnetic radiation?Electromagnetic radiation is a form of energy that travels through space in the form of waves, without the need for a medium to propagate. It is characterized by oscillating electric and magnetic fields that are perpendicular to each other and the direction of propagation.
At low frequencies, such as radio waves and microwaves, the radiation typically only causes heating of the matter, as it transfers energy to the molecules in the material.
At higher frequencies, such as infrared radiation, the radiation can cause vibrations in the atoms and molecules of matter, leading to heating and thermal effects.
Thus, When matter absorbs electromagnetic radiation, the effects that it has on the matter depend on the frequency of the radiation.
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Gas Laws
Assignment Active
Applying Gas Laws to Aerosol Can D
(国座
Explain why it is not a good idea to throw an
aerosol can into a fire. Which gas law applies?
DONE
Answer:
Ideal Gas Law
PV = nRT
Explanation:
Pressure is proportional to temperature;
The heat of the fire would cause increased pressure inside the closed aerosol vessel, eventually resulting in explosion of the vessel, once the temperature rises enough.
The Ka of acetic acid (CH3COOH) is 1.8 x10-5.
Calculate the pH of a 3.0 M solution of acetic acid.
Answer: 2.13
Explanation: i crawled so you could run :)
PLZZZ HELP CHEM!!!!!!! Easy points!!!!!
Answer:
H+
Explanation:
Answer:
OH-
Explanation:
An Arrhenius base is any species that increases the concentration of
OH
What is the general word equation for salt formation by neutralization?
a. Metal + nonmetal
b. Acid + metal
c. Base + nonmetal
d. Acid + base
Answer:d. Acid+base
Explanation:
Because, The general word equation for salt formation by neutralization is acid + base = salt + water.
Answer:
D ACID + BASE
Explanation:
5) Usted empuja muy fuerte un escritorio pesado e intenta moverlo. Usted efectúa trabajo sobre el escritorio: a.- Ya sea que lo mueva o no, siempre y cuando usted ejerza una fuerza. B.- Sólo si el escritorio se mueve. C.- Sólo si el escritorio no se mueve. D.- Nunca; el escritorio hace trabajo sobre usted. E.- Ninguna de las anteriores. ME AYUDAN PORFA?
Answer:
5) You push hard on a heavy desk and try to move it. You do work on the desk: A.- Whether you move it or not, as long as you exert a force. B.- Only if the desktop moves. C.- Only if the desktop does not move. D.- Never; the desk does work on you. E.- None of the above. CAN YOU HELP ME?
B.- Only if the desktop moves.
Explanation:
No work is done if a force is exerted but no displacement occurs. A force perpendicular to the displacement does no generate work.
Sam used 38 quarts of paint for the outside of the barn and he used 26 quarts for the inside of the barn. How many gallons of paint did sam use to paint the entire barn?
Answer:
Sam used 16 gallons of paint to paint the entire barn.
Explanation:
1 quart = 0.25 of gallon
38 + 26 = 64
64 / 0.25 = 16
16 gallons.
water is the only compound that commonly exists in the __ states on the earth
Answer: Water is the only known substance on Earth that exists naturally in three states: solid, liquid, and gas.
Explanation:
HELP PLEASE I WILL GIVE 100 PONTS
All of the following properties of a solution would decrease if you increased the concentration of solute, EXCEPT which?
A. freezing point
B. boiling point
C. vapor pressure
D. they would all decrease
Answer:
boiling point
Explanation:
The Sun is a constant supply of energy to Earth.
A. True
B. False
10 mL of 6 M HCL are diluted to 1 L with distilled water. What is the molarity of the dilute solution?
Answer:
The correct answer is 0.06 M
Explanation:
The concentration of the dilute solution (Cd= dilute concentration) can be calculated from the concentrated solution (Cc) and the volumes (Vi and Vf) as follows:
Cc x Vc = Cd x Vd
Cd = (Cc x Vc)/Vd
We have:
Cc= 6 M
Vc = 10 ml (volume of concentrated solution)
Vd= 1 L= 1000 ml (volume of dilute solution)
⇒Cd= (6 M x 10 ml)/1000 ml
Cd = 0.06 M
among the elements given below , the element with the least electronegativity is:
I) lithium
2) carbon
3) boron
4) fluorine
Answer:
least electronegative or most electropositive from the group is Mr. Lithium
Zinc reacts with iodine in a synthesis reaction: Zn + I2 → Znl2. What is the theoretical yield of Znl2, if 1.912 mol of zinc is used?
Answer:
610.3g
Explanation:
Zn:
m = 1.912
Zn : ZnI₂
1 : 1
1.912 : 1.912
ZnI₂:
m = 1.912 Mr = 65.4 + 2(126.9) = 319.2
mass = m×Mr:
mass = 1.912×319.2
mass = 610.3104 → 610.3g
The theoretical yield of Znl2, if 1.912 mol of zinc is used is 610.3g
Calculation of theoretical yield:Since Zinc reacts with iodine in a synthesis reaction: Zn + I2 → Znl2
And, there is 1.912 mol of zinc
So,
Zn : ZnI₂
1 : 1
And,
1.912 : 1.912
For
ZnI₂:
m = 1.912 Mr = 65.4 + 2(126.9) = 319.2
Now
mass = m×Mr:
= 1.912×319.2
= 610.3104
= 610.3g
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Chemical reactions will occur if_____.
- the mass of the products is greater than the reactants
- the products are more stable than the reactants
- the products are the same stability as the reactants
- the products are less stable than the reactants
Answer:
the products are more stable than the reactants
Explanation:
What are the strengths and limitations of a cell?
How might an antioxidant prevent another element from gaining or losing an electron?
Answer:
An antioxidant helps in the mopping up and elimination of free radicals and a common example is Glutathione. Oxidation reactions Involves the transfer of electrons or addition of oxygen to a substance.
Antioxidants help in decreasing or prevention of the oxidation of the molecules due to free radicals being formed which causes damage in the cells of animals.
True or False? The Grand Canyon was probably formed through wind abrasion.
Answer:
True.
Explanation:
Wind abrasion is a form of erosion.
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< Sarah >
La aspirina se prepara haciendo reaccionar ácido salicílico con exceso de anhídrido etanoico. En un experimento, 50.05 g de ácido salicílico se convirtieron en 55.45 g de aspirina. ¿Cuál fue el porcentaje de rendimiento?
La aspirina se prepara haciendo reaccionar ácido salicílico con exceso de anhídrido etanoico. En un experimento, 50.05 g de ácido salicílico se convirtieron en 55.45 g de aspirina. ¿Cuál fue el porcentaje de rendimiento?
In English:
Aspirin is prepared by reacting salicylic acid with excess ethanoic anhydride. In one experiment, 50.05 g of salicylic acid was converted to 55.45 g of aspirin. What was the yield percentage?
Answer:
el rendimiento porcentual para la cantidad dada de ácido salicílico es 84.99 %
In English:
the percent yield for the given amount of salicylic acid is 84.99%
Explanation:
La ecuación química equilibrada para la reacción se puede escribir como:
C₇H₆O₃ + C₄H₆O₃ → C₉H₈O₄ + HC₂H₃O₂
Para la reacción mostrada arriba; El reactivo limitante de la reacción es el ácido salicílico. Ahora; calcular el porcentaje de rendimiento; se espera que primero determinemos el rendimiento teórico de la reacción.
Entonces; la fórmula para calcular el porcentaje de rendimiento: [tex]\mathbf {= \frac{actual \ yield }{theoretical \ yield } *100 }[/tex]
El rendimiento teórico se determina de la siguiente manera:
50.05 g * 1 mol / 138.21 g / mol de C₇H₆O₃ * 1 mol de C₉H₈O₄ / 1 mol de C₇H₆O₃ * 180.157 g / mol de C₉H₈O₄ = 65.24 g de C₉H₈O₄
Porcentaje de rendimiento [tex]\mathbf {= \frac{55.45 }{65.24 } *100 }[/tex]
Porcentaje de rendimiento = 84.99%
Por lo tanto, el porcentaje de rendimiento para la cantidad dada de ácido salicílico es 84.99%
In English:
The balanced chemical eqaution for the reaction can be written as:
C₇H₆O₃ + C₄H₆O₃ → C₉H₈O₄ + HC₂H₃O₂
For the reaction shown above; The limiting reactant from the reaction is salicylic acid. Now; to calculate the percentage yield ; we are expected to first determine the theoretical yield of the reaction.
So; the formula for calculating the percentage yield [tex]\mathbf {= \frac{actual \ yield }{theoretical \ yield } *100 }[/tex]
The theoretical yield is determined as follows:
50.05 g * 1 mol/ 138.21 g/mol of C₇H₆O₃ * 1 mol of C₉H₈O₄/ 1 mol of C₇H₆O₃ * 180.157 g/mol of C₉H₈O₄ = 65.24 g of C₉H₈O₄ is produced
Percentage yield [tex]\mathbf {= \frac{55.45 }{65.24 } *100 }[/tex]
Percentage yield = 84.99%
Thus, the percent yield for the given amount of salicylic acid is 84.99%
How many moles of NaCl are contained in 100.0ml of a 0.20m solution
