Water and ethanol can be separated by distillation because they have different boiling points and different molecular structures.
What are two properties that make water and ethanol separable by distillation?Water boils at 100°C while ethanol has a boiling point of 78.5°C. The combination is heated until one of the liquids reaches its boiling point and vaporizes, while the other stays in liquid form, allowing for separation through distillation.
In addition, the molecular makeup of ethanol and water differs. Water is a larger molecule with a bent shape, whereas ethanol is a smaller molecule with a simple straight structure.
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The percent ionization of a 0.331M solution of HCN is found to be 0.00337%. What is the pH of this solution?
a. 1.992 b. 2.953 c. 3.371 d. 3.992 e. 4.953
The percent ionization of a 0.331M solution of HCN is found to be 0.00337%. The pH of the solution is 4.953. The correct option is E. 4.953.
To solve this problem, we need to use the equation for percent ionization:
% ionization = (concentration of ionized acid / initial concentration of acid) x 100%
We can rearrange this equation to solve for the concentration of ionized acid:
concentration of ionized acid = % ionization / 100% x initial concentration of acid
Plugging in the given values, we get:
concentration of ionized acid = 0.00337 / 100 x 0.331 = 0.000011187 M
Now, we can use the equation for the ionization of HCN to set up an expression for the equilibrium constant (Ka):
HCN + H2O ↔ H3O+ + CN-
Ka = [H3O+][CN-] / [HCN]
We can assume that the concentration of H3O+ is equal to the concentration of ionized acid, since the ionization of HCN produces one H3O+ ion for every HCN molecule that ionizes. We can also assume that the concentration of CN- is equal to the concentration of H3O+.
Therefore:
Ka = (concentration of ionized acid)^2 / (initial concentration of acid - concentration of ionized acid)
Plugging in the values we calculated, we get:
Ka = (0.000011187)^2 / (0.331 - 0.000011187) = 6.2 x 10^-10
Now, we can use the equation for the pH of a weak acid:
pH = pKa + log([A-] / [HA])
Since we assumed that the concentration of CN- is equal to the concentration of ionized acid, we can substitute [CN-] for [A-] and [HCN] - [CN-] for [HA]. We also know that pKa = -log(Ka).
Therefore:
pH = -log(6.2 x 10^-10) + log(0.000011187 / (0.331 - 0.000011187)) = 4.953
Therefore, the pH of the solution is e. 4.953.
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In an experiment, 125ml of H2 is collected over water at 27C and barometric pressure of 753 torr. the vapor pressure of water at 27C is 26.74 what is the partial pressure of H2?
Answer:
Partial pressure of H₂ = 0.9556 atm
Explanation:
Given:
Barometric pressure = 753 torr
Vapor pressure of water = 26.74 torr
FInd:
Partial pressure of H₂
Computation:
Partial pressure of H₂ = Barometric pressure - Vapor pressure of water
Partial pressure of H₂ = 733 - 26.74
Partial pressure of H₂ = 726.26 torr
1 atm = 760 torr
So,
Partial pressure of H₂ = 726.26/760
Partial pressure of H₂ = 0.9556 atm
Explain biomass combustion and energy recovery using grate
furnace or fluidized bed systems
Biomass combustion is referred to as a process in which organic materials are burnt and their remains are used to produce energy.
The process of combustion is very simple it refers to the burning of biomass which include wood, farm waste, and crops which are further used to produce or generate energy in the form of electricity and also heat, it can be termed as renewable energy that utilized the energy of biomass to produce another form of energy.
The Grate furnace method is one of the common methods used for biomass combustion and comprises several steps for the recovery of energy.
The first step consists of drying up the biomass by removing all the moisture using heat. The next step includes the production of flames and heat by combusting hydrogen present in it. After that, the remaining solid waste will undergo combustion in the presence of oxygen.
The last step includes the disposal of ash which gets accumulated due to incombustible materials like sand.
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Which two statements describe how volcanic activity can affect Earth's crust?
A) A volcano are most likely to form near the center of tectonic plates
B) A volcanic mountain becomes smaller each time it erupts
C) A volcano can suddenly get taller every time it erupts
D) Hot magma from inside earth is released at weak points in the crust
Answer:
D
Explanation:
The weak crust of the earth does not hold together as well as strong crust.
Answer:
A and B was right in our test.
Explanation:
A was: A volcano can suddenly get taller every time it erupts
B was: Hot magma from inside Earth is released at weak points in the crust.
KI + Pb(NO3)2 → Pbl2 + KNO3
This chemical reaction represents the reaction of
potassium iodide (KI) and lead nitrate (Pb(NO3)2) to
form lead iodide (Pbl2) and potassium nitrate (KNO3).
When correctly balanced, the coefficient for lead iodide
will be_________.
Select one:
3
6
2
The balanced for the reaction is:
2KI + Pb(NO₃)₂ → Pbl₂ + 2KNO₃
When the equation is balanced, the number of atoms for each element on both the reactant and product sides of the equation are equal. This can be seen below:
Reactant Product
K 2 2
I 2 2
Pb 1 1
N 2 2
O 6 6
Drag and drop each of the three molecular sizes to the location each would occur during the process of column chromatography.
The correct positions of the different molecular sizes within the column chromatography are as follows: Small molecules: Start, Intermediate molecules: Middle, and Large molecules: End
Chromatography is based on the principle where molecules in mixture applied onto the surface or into the solid, and fluid stationary phase (stable phase) is separating from each other while moving with the aid of a mobile phase.
During the process of column chromatography, the different molecular sizes will settle at different positions. The small molecules are going to travel through the column at a much slower pace than the larger molecules. The three molecular sizes involved in the process of column chromatography are the following:
i) Small molecules
ii) Intermediate molecules
iii) Large molecules
Now, we have to place these molecules in their respective positions. The following is a drag and drop table which shows the positions of each molecule within the chromatography process:
Molecule size Position
Small molecule Start
Intermediate molecule Middle
Large molecule End
Therefore, the correct positions of the different molecular sizes within the column chromatography are as follows:
Small molecules: Start Intermediate molecules: Middle Large molecules: End
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Calculate the number of Liters (L) needed to make a 0.1-M (molar) sodium hydroxide (NaOH) solution made with 20.0-grams of solute.
The volume (in liters) needed to make 0.1-M (molar) sodium hydroxide (NaOH) solution containing 20 grams of solute is 5 Liters
How do i determine the volume needed?We shall begin our calculation by obtaining the mole of 20 grams of NaOH. Details below:
Mass of NaOH = 20 grams Molar mass of NaOH = 40 g/mol Mole of NaOH =?Mole = mass / molar mass
= 20 / 40
= 0.5 mole
Now, we shall obtain the volume needed. This is shown below:
Molarity of solution = 0.1 MMole of NaOH = 0.5 moleVolume needed =?Volume needed = mole / molarity
= 0.5 / 0.1
= 5 Liters
Thus, the volume needed is 5 Liters
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Write a nuclear equation for the beta decay of the following isotopes: Lead-210
In this question, we need to determine what will be the nuclear equation for the Beta decay of Lead - 210.
Beta decay is a type of radioactive decay in which we will have either a neutron becoming a proton, this will be called Beta-minus decay or a proton becoming a neutron, this will be called a Beta-plus decay
In the case of Pb-210, we will have a Beta-minus decay, and one neutron will become a proton:
210/82 Pb ---> 210/83 Bi + electron
Lead - 210 will become Bismuth - 210
What is the mass of 1.6x10^20 molecules of carbon monoxide?
We need to find the mass of 1.6x10^20 molecules of carbon monoxide
First, we must find the number of mol in the 1.6x10^20 molecules
For this, we need to use the avogadro's number ( 6.02*10^23 )
\(1.6\cdot10^{20}\cdot\frac{1\text{mol}}{6.02\cdot10^{23}}=2.66\cdot10^{-4}\text{mol}\)Then, we must calculate the molar mass of carbon monoxide
M(CO) = 12 g/mol + 16 g/mol = 28 g/mol
Finally, we must multiply the number of mol by the molar mass to find the mass
\(2.66\cdot10^{-4}mol\cdot28\frac{g}{mol}=7.448\cdot10^{-3}g=0.007448g\)ANSWER:
0.007
Consider the substances hydrogen (H2), fluorine (F2), and hydrogen fluoride (HF). Based on their molecular structures, how does the boiling point of HF compare with the boiling points of H2 and F2? The boiling point of HF is the boiling point of H2, and it is the boiling point of F2.
Answer:
the boiling point of HF is higher than H2 and F2
Explanation:
it is because inter molecular give is present in HF because of the Hydrogen bond present. Hydrogen bond is strong and will require much energy to break ,since no hydrogen bond is in the rest H2 and F2 has a low boiling point
The boiling point of a liquid depends upon the pressure of the surrounding. Here HF has higher boiling than the molecule of hydrogen and fluorine due to the presence of hydrogen bonding between 'H' and 'F' atoms.
What is boiling point?The temperature at which the vapor pressure of the liquid becomes equal to the atmospheric pressure of the liquid's environment is defined as the boiling point. A t this temperature, the liquid is converted into a vapour.
The intermolecular forces can be used to predict the relative boiling points. If stronger is the intermolecular force, the lower is the vapor pressure of the substance and the higher is the boiling point.
The order of intermolecular forces are:
H - bonding > dipole-dipole > London dispersion (Van der Waals)
Here HF has intermolecular hydrogen bonding which is not present in H₂ and F₂ and has high boiling point.
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Please do the worksheet
What is the mass of 6.02 x 1023 particles of rubidium carbonate
Answer:
Explanation:
84.97
What kind of reaction does this make?2 C₅H₅ + Fe ⟶ Fe(C₅H₅)₂A. Synthesis (S)B. Decompostion (D)C. Single Displacement (SD)D. Double Displacement (DD)E. Combustion (C)
The answer is option
The reaction:
\(2C_{5_{}}H_5+Fe\rightarrow Fe(C_5H_5)_2\)is a Synthesis reaction, because from 2 different substances it is produced
Which factors make the climates different at Missoula, MT and Cape Elizabeth, ME. ?
The factor that make the climates different at Missoula, MT and Cape Elizabeth, ME is C. altitude and proximity to large bodies of water.
Why is the climate different ?Missoula, MT is located in a high-altitude region and is far from large bodies of water, which results in a continental climate with cold winters and hot summers.
Cape Elizabeth, ME is located at a lower altitude and is near the Atlantic Ocean, which results in a maritime climate with mild winters and cool summers.
In conclusion, one of the factors that endures that the climates in Missoula and Cape Elizabeth, is the altitude as well as how close they are to oceans.
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true or false an athlete breaks open an instant ice pack and it almost immediately gets very cold as the chemicals inside react. identify the chemicals as the system. identify the following items as being part of the system or the surroundings, and indicate whether the process is exothermic or endothermic.
True. The athlete breaks open an instant ice pack and it almost immediately gets very cold as the chemicals inside react.
Identify the chemicals as the system. The chemicals are the system. The following items are part of the system or surroundings, and the process is exothermic. When the instant ice pack is broken, it causes a chemical reaction to occur, which creates cold energy that is released into the surroundings. When a chemical reaction absorbs heat from its surroundings, it is referred to as an endothermic reaction. Heat is released into the environment during an exothermic reaction. In this scenario, the process is exothermic because the reaction produces cold energy that is released into the surroundings.
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Which of the following statements is correct?
Air is a mixture and table salt is a compound
Table salt is a mixture and carbon is a compound.
Carbon is a mixture and air is a compound.
Air is a mixture and carbon is a compound
Air is a mixture and carbon is a compound
Explanation:
I'm pretty sure it is right, if it's wrong then my second answer would be A.
What is the mass % of H in Mn(C₂H₂O₂)4?
The percent mass of H is 3.3%. This can be found from the data of the elements that we have in the problem.
How do you find the percent mass of an element in a compound?To find the percent mass of an element in a compound, you need to follow these steps:
Determine the molar mass of the compound: This is the sum of the atomic masses of all the elements in the compound. You can find the atomic masses of elements on the periodic table.
Determine the molar mass of the element: This is the atomic mass of the element as it appears in the compound.
Calculate the moles of the element in the compound: This can be done using the formula: Moles = Mass of element / Molar mass of element.
Calculate the percent mass of the element in the compound: This can be done using the formula: Percent mass = (Moles of element x Molar mass of element / Molar mass of compound) x 100%.
Molar mass of the compound = 239 g/mol
Mass of H present = 8 (1) = 8
Percent of H = 8/239* 100/1
= 3.3%
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1. What glycolytic intermediate can be converted to the amino acids A, V, or L?
2. TRUE/FALSE: The periportal portion of the liver is used for ammonia capture to make the amino acid Q.
The glycolytic intermediate that can be converted to the amino acids A, V, or L is pyruvate.
Pyruvate is an important intermediate in glycolysis and can be further metabolized into various pathways, including amino acid synthesis. Pyruvate can be converted into alanine, valine, and leucine through different biosynthetic pathways.
FALSE. The periportal portion of the liver is used for urea synthesis to eliminate excess ammonia produced during amino acid metabolism. The amino acid Q is synthesized through a different biosynthetic pathway.
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11 GRAMS of an electrolyte was dissolved in 44 grams of water, the resulting solution
was found to have a molarity of 0.497 mol/L. The freezing point of the solution was
determined to be -2.92°C. The freezing point depression constant for water is -1.86°C
and pure water may be assumed to freeze at 0°C. If the molecular weight of the
electrolyte is 106.8 g/mol and it takes 33 minutes to perform the experiment, what is
the molarity of the solution in mol/L? Enter a numeric answer only
The molarity of the solution is 0.234 mol/L
What is the molarity of a solution?The molarity of a solution is the amount in moles of a solute dissolved in a given volume of solvent.
Molarity = number of moles/ volume of solution in litersThe molarity of the solution is determined as follows:
Number of moles of electrolyte = mass/molar massmass of electrolyte = 11 g
molar mass of electrolyte = 106.8 /mol
Number of moles of electrolyte = 11/106.8 = 0.0103 moles
Volume of water = mass/densitydensity of water = 1 g/cm³
mass of water = 44 g
Volume of water = 44/1 = 44 ml or 0.044 L
Molarity of solution = 0.0103/0.044
Molarity of solution = 0.234 mol/L
In conclusion, the molarity of the solution is determined from the moles of solute and volume of solvent.
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_S8+_O2=_SO2
please help balance
Answer:
S8+8o2 = 8so2
this is balance d
1. 0 g of h_{2}o_{2} solution (30 wt%) was titrated with 22. 143 ml of kmno_{4} solution. What is the molarity of the kmno_{4} solution? Report your answer with three decimal places. Molar mass: H2O2 = 34. 01g/mol Reaction: 2MnO2 + 5H2O2 + 6H+ + 2Mn +2 +502 +8H2O Type your numeric answer and submit
The molarity of the KMnO4 solution is 0.532 M (rounded to three decimal places).
To calculate the molarity of the KMnO4 solution, we need to use the stoichiometry of the reaction and the volume of the KMnO4 solution used in the titration.
Given:
Mass of H2O2 solution = 1.0 g
Concentration of H2O2 solution = 30 wt% (weight percent)
Volume of KMnO4 solution used = 22.143 mL
Molar mass of H2O2 = 34.01 g/mol
Step 1: Calculate the moles of H2O2 in the solution.
Moles of H2O2 = (Mass of H2O2 solution) / (Molar mass of H2O2)
= 1.0 g / 34.01 g/mol
= 0.0294 mol
Step 2: Calculate the moles of KMnO4 based on the stoichiometry of the reaction.
According to the balanced equation, the ratio of KMnO4 to H2O2 is 2:5.
Therefore, moles of KMnO4 = (Moles of H2O2) * (2/5)
= 0.0294 mol * (2/5)
= 0.01176 mol
Step 3: Calculate the molarity of the KMnO4 solution.
Molarity (M) = (Moles of KMnO4) / (Volume of KMnO4 solution in liters)
= 0.01176 mol / 0.022143 L
= 0.5316 M
Therefore, the molarity of the KMnO4 solution is 0.532 M (rounded to three decimal places).
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Select true or false: a compound with the formula c6h12 may or may not be a saturated hydrocarbon.
It is true that a molecule with the given formula \(C_{6} H_{12}\) could be a saturated hydrocarbon.
What is a saturated hydrocarbon?Hydrocarbons or \(C_{6} H_{12}\) is defined as a single bond between the carbon atoms which can be said as saturated hydrocarbons. They belong to the most basic group of hydrocarbons. Because each carbon atom is linked to as many hydrogen atoms as possible, they are referred to as saturated.
Water cannot dissolve in saturated hydrocarbons as they are less dense than water with increasing carbon chain or ring size, melting and boiling points rise. The characteristics of saturated hydrocarbons chemically is combustion and halogenation which are two significant reactions. Alkanes or saturated hydrocarbons have the general formula \(C_{n} H_{2n+2}\) where \(n\) is how many carbon atoms there are in an alkane molecule.
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A certain chip W used in a circuit of a micro computer has a mass of 5.68 milligram ,calculate the amount of W in the micro computer (W=28g/mol)
The amount of W : = 1.22 x 10²⁰
Further explanationGiven
5.6 mg of a micro computer
Required
The amount of chip
Solution
A mole is a number of particles(atoms, molecules, ions) in a substance
1 mole = 6.02.10²³ particles
Can be formulated :
N = n x No
N = number of particles
n = mol
No = 6.02.10²³ = Avogadro's number
mass = 5.68 mg = 5.68 x 10⁻³ g
mol :
= mass : MW
= 5.68 x 10⁻³ g : 28 g/mol
= 2.03 x 10⁻⁴
The number of atoms :
= 2.03 x 10⁻⁴ x 6.02.10²³
= 1.22 x 10²⁰
Which eukaryotic cell does the organelle shown belong to?
CM
Answer:
The Eukaryotic cell that the organelle shows below belongs to the Nucleus.
Explanation:
In fact, the mere presence of a nucleus is considered one of the defining features of a Eukaryota cell.
necesito ayuda con esto y si es necesario con procedimientos, gracias
Answer:
sorry but I don't understand Spanish
otherwise I will definitely helps you
I don't understand Spanish but you can do this :)
Which statement below best describes a catalyst?
Question 3 options:
An item that can slow reactions rates
A molecule that is consumed in a chemical reaction
An item that can increase reaction rates
An item that increases the concentration of reactions
How does the rate of today's warming compare to previous episodes of
rapid climate change on Earth?
A. Today's climate warming is about as fast as the temperature swings that have
happened in Earth's past.
B. Past changes in the climate have been faster than the changes we're seeing today.
C. Today, the Earth's climate is changing much faster than it has changed in the past.
Answer:
B. Past changes in the climate have been faster than the changes we're seeing today
Explanation:
The Earth is warming abnormally quickly . Over the past century it has warmed roughly 10 times faster than the average increase in temperature after each ice age .
so the answer is B.Past changes in the climate have been faster than the changes we're seeing today.
how long will take an object traveling at 25 m/s to reach a distance of 125 meters?
Answer:
5s
Explanation:
What is the melting point of water in kelvin?
Please help me, Thank you!
Answer:
amount of charge
Explanation:
Oxygen and sulfur are both in Group 16, which means they have a -2 charge. They have two more electrons than protons, making the charge of the ion negative.
Hope that helps.