Answers
Answer:
M = 0.125 M
Explanation:
Given data:
Molarity = ?
Volume of solution = 2 L
Mass of K₂SO₄ = 43.55 g
Solution;
Molarity is used to describe the concentration of solution. It tells how many moles are dissolve in per litter of solution.
Formula:
Molarity = number of moles of solute / L of solution
Number of moles of solute:
Number of moles = mass/molar mass
Number of moles = 43.55 g / 174.26 g/mol
Number of moles = 0.25 mol
Molarity:
M = 0.25 mol / 2 L
M = 0.125 M
Related Questions
the oven thatb hardnens clay products to a temperature and put them to an irreversible state to their original material (clay) and are tremed as ceramics is
Answers
A kiln is a specialized oven used in ceramic art to harden clay objects to a temperature that causes irreversible chemical changes in the clay, resulting in a permanent transformation of the material into ceramics.
What is a kiln and how is it used in ceramic art?
A kiln is a specialized oven used in ceramic art to harden clay objects to a temperature that causes irreversible chemical changes in the clay, resulting in a permanent transformation of the material into ceramics.
The temperature required for this transformation depends on the type of clay being used and the desired final product, but it typically ranges from around 1,000 to 1,400 degrees Celsius (1,800 to 2,550 degrees Fahrenheit). Kilns can be used for a variety of ceramic techniques, including firing, glazing, and decorating clay objects.
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in which coastal area is the tide rising to form a high tide. giving brainliest.
Answers
Answer:
d.one that is rotating toward the moon
Answer:
I think D is the answer
Explanation:
when an electron moves from a higher orbit to a lower one does it always follow the same path explained
Answers
Yes, electron follows the same path when it absorb and loses energy.
Yes, when an electron moves from a higher orbit to a lower orbit it always follow the same path as it moves from a lower orbit to a higher orbit. When electron absorb energy it has the power to move from lower orbit to higher orbit or energy level.
While on the other hand, when an electron loses that energy, it comes back to its original position from which it moves earlier when it absorb energy so we conclude that electron follows the same path when it absorb and loses energy.
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compare the pH value of the solution before the battery is connected to the pH value of the solution after the cell operates for 20 minutes
Answers
Without further details on the specific cell and its components, it is not possible to provide a definitive answer regarding the pH change before and after the cell operates for 20 minutes.
The pH value of a solution can potentially change before and after the operation of a cell, depending on the specific reaction occurring in the cell and the nature of the electrodes involved.
However, without additional information about the specific cell and its components, it is difficult to provide a definitive answer. The pH of a solution is influenced by the concentration of hydrogen ions (H+) in the solution, which can be affected by various chemical reactions, including oxidation and reduction reactions occurring in the cell.
During the operation of a cell, the electrodes undergo chemical reactions, and ions from the electrolyte may participate in these reactions. These reactions can influence the concentration of hydrogen ions and potentially alter the pH of the solution. The direction of the pH change depends on the specific reactions occurring at the electrodes.
For example, in an electrolytic cell, the flow of electric current causes non-spontaneous redox reactions to occur. These reactions might involve the generation or consumption of hydrogen ions, which can affect the pH of the solution.
In a galvanic cell or battery, spontaneous redox reactions take place, and the pH changes can be more complex. The electrode materials, their potential, and the specific reaction kinetics can influence the pH changes in the solution.
Therefore, without further details on the specific cell and its components, it is not possible to provide a definitive answer regarding the pH change before and after the cell operates for 20 minutes. The pH change would depend on the specific reactions occurring in the cell and the behavior of the electrodes involved.
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Use the information in the table below to respond to the statements and questions that follow. Your answers should be in terms of principles of molecular structure and intermolecular forces. a) Draw the complete Lewis electron-dot diagram for ethyne in the appropriate cell in the table below. (1) Compound Ethanethiol Formula CH3CH2SH Ethane CH3CH3 Lewis Electron Dot Diagram HH H:C:C:S:H HH HH H:C:C:H HH HH H:C:C:0:H HH Ethanol CH3CH2OH Ethene CzH b) Which of the four molecules contains the shortest carbon-to-carbon bond? Explain. [2] c) Explain how the structure of the molecules affects the energy that is required to boil ethanol. Consider the statement " As ethanol boils energy goes into breaking C-C bonds, C-H bonds, C-o bonds and O-H bonds." Is the statement true or false? Justify your answer. [2] d) Ethanol is completely soluble in water, whereas ethanethiol has limited (significantly less) solubility in water. Account for the difference in solubilities between the two compounds in terms of intermolecular forces. [2]
Answers
The complete Lewis electron-dot diagram for ethyne is shown in the attached diagram below:
What is the lewis electron dot diagram?A lewis electron dot structure can be utilized to represent the number of bonds, the lone pairs left in the atoms, and the bonding atoms in the molecule.
Solid lines are used to represent the bonds between atoms that are directly bonded to one another and excess electrons are denoted as dot pairs and are represented next to the atoms.
As the valence electrons of each carbon atom are equal to 4 from the electronic configuration of the carbon atom. First, the total number of valence electrons in a molecule is 4 + 1 + 1 + 4 = 10.
As each carbon atom needs only 4 electrons to complete its octet. As the octet completes, the rest of the electrons are assigned as the lone pairs of atoms. But there are no lone pairs in the molecule of the ethyne.
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What is an activated complex?
Answers
Answer:
What is meant by activated complex?
The state of the particles that is in between the reactants and products is called the activated complex. An activated complex is an unstable arrangement of atoms that exists momentarily at the peak of the activation energy barrier.
source:Gogle
give the correct valence for ions of the following elements. drag the appropriate labels to their respective targets.
Answers
The correct valence for ions of the following elements are:
Ca: 2+
Cl: 1-
O: 2-
Al: 3+
K: 1+
What is valence?
In chemistry, valence refers to the combining power of an element, which is determined by the number of electrons an atom can lose, gain, or share to form chemical bonds with other atoms. The valence of an element can be used to predict its chemical behavior, including the types of compounds it can form and the way it interacts with other elements.The valence of an element is often represented by a number, which indicates the number of electrons an atom of that element can gain, lose, or share when it reacts with other atoms. For example, the valence of sodium is +1, because it has one electron in its outermost shell that it can lose to form a positively charged ion. The valence of chlorine is -1, because it has one vacancy in its outermost shell that it can fill by gaining an electron from another atom.To know more about valence, click the link given below:
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you are presented with a solution. when solute crystals are added to the solution, they sink and remain on the bottom of the beaker. the solution is said to be group of answer choices undetermined saturation supersaturated unsaturated saturated
Answers
The given solution is a saturated solution. A homogeneous mixture composed of two or more substances is called a solution.
In a solution, there are two primary components, which are termed as,
Solute (The minor component that is dissolved in a solution).Solvent (The major component that dissolves the solute).At a given temperature and pressure, every solvent is capable of dissolving a particular amount of solute in it.
If a solution has dissolved less amount of solute than it is capable of dissolving, then the solution is known as an unsaturated solution.
If a solution has dissolved as much as it is capable of dissolving, then the solution is known as a saturated solution.
If a solution has dissolved more amount of solute than it is capable of dissolving, then the solution is known as a supersaturated solution.
In the given problem, when the solute crystals are added to the solution, they sink and remain on the bottom of the beaker.
Hence, the given solution is saturated.
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Which activity causes a chemical change to occur? *
Mark only one oval.
A. cutting a banana
B. pouring milk
C. tossing salad
D. baking muffins
Answers
Answer: D. baking muffins
Explanation:
A chemical change occurs once some reactants/ingredients are mixed together to create a new product.
In the case of cutting a banana = you still get a banana;
pouring milk = you still have milk;
tossing a salad = cut up veggies = just cut up veggies next to each other;
whereas baking muffins: you begin with flour, sugar, butter, etc. (individual ingredients), and then you bake them (add energy to the system), which in turn gives you a new product = muffins.
What is a vapor?
OA. A substance that has a much higher melting point and boiling
point than other similar substances
B. A substance that is in the gas phase at a temperature at which it
would normally be a solid or liquid
OC. A substance that is always in the solid or liquid phase at room
temperature
O D. A substance that forms a gas, but only at very high temperatures
SUBMIT
Answers
The correct definition of vapor is: "B. A substance that is in the gas phase at a temperature at which it would normally be a solid or liquid."
What is the definition of a Vapor?
A vapor is a substance that exists as a gas at a temperature that is typically associated with solids or liquids.
Unlike gases, which can exist at a wide range of temperatures, vapors specifically refer to substances that have transitioned into the gas phase despite their expected solid or liquid state under normal conditions.
This transition usually occurs due to increased temperature, causing the substance to evaporate or sublimate.
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i need help with the question below
Answers
Determine the total kilojoules in two tablespoons
Answers
The total kilojoules in two tablespoons is 836.8 kJ.
To determine the total kilojoules in two tablespoons of a substance, we need to know the specific substance and its energy content per tablespoon. Different substances have different energy values, so without this information, it is not possible to provide an accurate calculation.
The energy content of food or substances is typically measured in kilocalories (kcal) or kilojoules (kJ). 1 kilocalorie is equal to 4.184 kilojoules. The energy content of a substance is often listed on food labels or in nutritional databases.
For example, if we have the energy content of a substance as 100 kilocalories (kcal) per tablespoon, we can convert it to kilojoules by multiplying it by 4.184:
100 kcal * 4.184 kJ/kcal = 418.4 kJ
So, if we have two tablespoons of this substance, the total energy would be:
418.4 kJ/tablespoon * 2 tablespoons = 836.8 kJ
It's important to note that the energy content of a substance can vary depending on its composition, density, and other factors. Therefore, it is always recommended to refer to reliable sources such as food labels, nutritional databases, or consult a qualified professional to obtain accurate information regarding the energy content of specific substances.
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HEEELLLPPPP:(!!!!! im stuckkkk!!!
Answers
Answer:
LIGHT
AIR
SHELTER
FOOD
WATER
Answer:
light
air
shelter
food
water
What happens to the amount of solution when we add food colour to it?
Answers
Answer:
We need more? What else is in the question? This is unanswerable.
Explanation:
is energy from the light source conduction convention or radiation
Answers
In which phase transition do molecules move directly from a state involving vibration of particles in a fixed position to a state involving random movement of high-speed particles?
evaporation
sublimation
freezing
deposition
Answers
would be your answer because it releases other cells out and causes the needy of cells to evaporate and sink.
sublimation is the phase transition do molecules move directly from a state involving vibration of particles in a fixed position to a state involving random movement of high-speed particles.
What is Sublimation?In the process of printing sublimation shirts, an image is first printed on a special sheet of paper before being transferred to a different material, typically polyester or a polyester blend. After that, heat is applied to the ink until it fuses with the fabric.
Sublimation shirt printing is more expensive than other procedures, but it produces shirts that stay longer and don't peel or crack over time.
he primary distinction between sublimation and heat transfer is that during sublimation, just the ink transfers to the substrate. A transfer layer is frequently also transferred to the material during the heat transfer procedure.
Therefore, sublimation is the phase transition do molecules move directly from a state involving vibration of particles in a fixed position to a state involving random movement of high-speed particles.
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Examine the image and assess the relationship of the atoms shown by
Answers
Answer:
The rearrangement of atoms is a chemical change.
Explanation:
What do we call a large group of wind turbines used to generate electricity?
1)Wind Pack
2)Wind Mill
3) Wind Farm
4) Wind Plant
Answers
Answer:
your answer is 3 hope this helps you
Answer:
A wind farm
Explanation:
another word is a wind park
The volume of blood in the body of a deep sea diver is about 4.95 L . Blood cells make up about 45% of the blood volume and the remaining 55% is the aqueous solution called plasma. The diver dives to a depth of 93.0 m where the pressure is 10.0 atm. What is the maximum volume of nitrogen gas, in liters, that can dissolve in the diver's blood plasma where the diver's body pressure is 1.00 atm and temperature is 37 °C? (This is the volume that could come out of the solution suddenly, causing the painful and dangerous condition called the bends if the diver were to ascend too quickly.) Assume that Henry's constant for nitrogen at 37 °C is 5.80×10−4mol·L−1·atm−1.
Answers
The volume of nitrogen dissolved in blood plasma is 0.4 L.
What is the maximum volume of nitrogen gas, in liters, that can dissolve in the diver's blood plasma?The maximum volume of nitrogen that can dissolve in the diver's blood plasma is obtained as follows:
Number of moles of nitrogen dissolved at a depth of 93.0 m = Henry's constant * pressure at 93.0 m * volume of plasma
Number of moles of nitrogen = 5.80 × 10⁻⁴ * 10 * (4.95 * 55%)
Number of moles of nitrogen = 0.0158 moles
Hence,;
Volume, V = nRT/Pn = 0.0158 moles
R = 0.08206 L.atm/mol/K
T = 37 + 273 = 310 K
P = 1 atm
V = 0.0158 * 0.08206 * 310/1
V = 0.4 L
In conclusion, the volume of nitrogen dissolved in blood plasma is determined using the number of moles of dissolved nitrogen.
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(04.02 LC)
During photosynthesis, water and carbon dioxide become glucose and oxygen.
True
False
Answers
Answer:
true............,....
Answer:False
Explanation:
This statement is false. Correct statement: Photosynthesis produces glucose and oxygen. ... In this process, plants produce glucose and oxygen from carbon dioxide and water in the presence of sunlight. Photosynthesis converts light energy into chemical energy.
I'm having difficult to draw the resonance structure of this molecule. Someone can help me, please
Answers
Please I need help thank you
Answers
Answer:
its sodium hydroxide
Explanation:
the frist step in the industrial recovery of copper from copper sulfide ore is roasting that is the conversion of cus to cu o by heating 2cus +3o2(g)____2cu(s)+2so2(g) Δ H = -114.6 kJ/mol
Answers
The heat evolved per gram of CuS roasted is -5.01 kJ/g.
What is the industrial recovery of copper?The reaction is exothermic, with a delta H of -114.6 kJ/mol. This means that the reaction releases 114.6 kJ of heat for every mole of CuS that is converted to CuO. The reaction is carried out in a roaster, which is a large, industrial-scale furnace that is specifically designed for this process.
To solve the above problem, we need to determine the heat evolved per mole of CuS roasted, and then convert that to heat per gram of CuS roasted.
The heat evolved per mole of CuS roasted can be calculated using the given equation and the given value for the enthalpy change:
AH = -805.6 kJ/mol
We can then convert the heat evolved per mole to heat evolved per gram by dividing by the molar mass of CuS:
Heat per gram = (-805.6 kJ/mol) / (160.6 g/mol) = -5.01 kJ/g
Therefore, After roasting, the copper oxide is then leached with a solution of sulfuric acid to extract the copper. The resulting solution is then filtered and the copper is recovered from the solution through a process called electrowinning.
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See full question below
The first step in the industrial recovery of copper from the copper sulfide ore is roasting, that is, the conversion of CuS to CuO by heating: 2CuS(s) + 302(g) → 2CuO(s) + 2802(g) AH = -805.6 kJ/mol Calculate the heat evolved (in kJ) per gram of CuS roasted.
Consider a Galvanic cell constructed from the following half cells, linked by a KCl salt bridge: an Fe electrode in 1.0 M FeCl2 solution and a Sn electrode in 1.0 M Sn(NO3)2 solution When the cell is running spontaneously, which choice includes only true statements and no false ones?a) The iron electrode gains mass and the iron electrode is the cathode.b) The tin electrode gains mass and the tin electrode is the cathode.c) The iron electrode gains mass and the iron electrode is the anode.d) The iron electrode loses mass and the iron electrode is the cathode.e) The tin electrode loses mass and the tin electrode is the cathode.
Answers
Answer:
b) The tin electrode gains mass and the tin electrode is the cathode.
Explanation:
Iron(ii) ion, Fe⁺ is higher than tin(ii) ion, Sn²⁺ in the electrochemical series, therefore, tin (ii) iron is preferentially discharged to iron(ii) ion in aqueous solutions.
Also, since oxidation occurs at the anode and reduction occurs at the cathode, in the Galvanic cell constructed from the following half cells, linked by a KCl salt bridge: an Fe electrode in 1.0 M FeCl2 solution and a Sn electrode in 1.0 M Sn(NO3)2 solution, the Fe electrode serves as the anode, while the Sn electrode serves as the cathode.
The Sn²⁺ ions in the aqueous solution of Sn(NO₃)₂ will accept electrons from the Sn cathode and become deposited as neutral Sn atoms. At the anode, neutral Fe atoms will dissolve into the FeCl₂ solution depositing their electrons at the anode, thereby losing mass.
Therefore the correct option is: (b) The tin electrode gains mass and the tin electrode is the cathode.
If 315 days have passed how many grams of iodine-125 will remain undecayed
Answers
Mass of Iodine-125 remaining undecayed after 315 days is 8.28 g.
What mass of iodine-125 will remain undecayed if 315 days have passed?The mass of iodine-125 which will remain undecayed if 315 days have passed is determined as follows:
Half-life of Iodine-125 = 60 days
Number of half lives in 315 days is to be determined.
315 days = 300 days + 15 days
Number of half lives in 300 days = 300 / 600
Number of half lives in 300 days = 5 half lives
Number of half lives in 15 days = 15 / 60
Number of half lives in 15 days = 1/4 half lives
After 5.25 half lives, amount remaining = (0.5)⁵°²⁵ = 0.02628
Mass remaining undecayed = 0.02628 * 315
Mass remaining undecayed = 8.28 g
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Complete question:
The half-life of iodine-125 is 60 days and an initial mass of 300 g is present.. If 315 days have passed how many grams of iodine-125 will remain undecayed
which is the graph of the function g(x) = f(-x)
Answers
To graph the function g(x) = f(-x), you can start with the graph of f(x) and then reflect it about the y-axis.
What is a graph of the function g(x) = f(-x)?To find the graph of the function g(x) = f(-x), we can start with the graph of the function f(x) and then reflect it about the y-axis.
If the graph of f(x) is symmetric with respect to the y-axis, meaning it is unchanged when reflected, then g(x) = f(-x) will have the same graph as f(x).
However, if the graph of f(x) is not symmetric with respect to the y-axis, then g(x) = f(-x) will be a reflection of f(x) about the y-axis.
In either case, the resulting graph of g(x) = f(-x) will be symmetric with respect to the y-axis.
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A soccer player practices kicking the ball into the goal from halfway down the soccer field, which is 45 meters away. The time it takes for the ball to get to the goal from the time it is kicked is 3 seconds. The player wants to know the velocity of the ball.
Is there enough information to calculate this?
Yes, displacement is 45 meters, elapsed time is three seconds, and the direction is toward the goal. Velocity is 135 m/s toward the goal.
No, only speed can be calculated from the distance of 45 meters and the time of 3 seconds.
Yes, displacement is 45 meters, time is three seconds, and the direction is toward the goal. Velocity is 15 m/s towards the goal.
Answers
Answer:
Yes, displacement is 45 meters, time is three seconds, and the direction is toward the goal. Velocity is 15 m/s towards the goal.
Explanation:
Hope this helped!
Which of the following is an example of a scientific model???
Answers
Scientific models are representations of scientific theories, basically, a hypothesis that is not stated is words, but in computerized programs, visual models, mathematics, and other ways.
Hope this helps!
why is earth often referd as a blue planet ?
A-When viewed from space, the biosphere always looks blue.
B-Most people like blue.
C-The sky is blue.
D-The hydrosphere looks blue and covers three-fourths of the Earth’s surface.
NEED ANSWER ASAP
Answers
Answer:
D-The hydrosphere looks blue and covers three-fourths of the Earth’s surface.
Explanation:
Combined Gas Law equation is represented by
A)T1 / P1V1 = T2 / P2V2
B) P1V1 / T1 = P2V2 / T2
C)P1V1 / T1 = (P2V2 / T2)2
D)PV = nRT
Answers
The combined Gas Law equation is represented by B) P1V1 / T1 = P2V2 / T2.
The combined gas law is the law that combines Charles’s law, Gay-Lussac’s law, and Boyle’s law.
Combined gas law can be mathematically expressed as
k = PV/T
Where,
P = pressure
T = temperature in kelvin
V = volume
K = constant (units of energy divided by temperature)
When two substances are compared in two different conditions, the law can be stated as,
P1V1/T1 = P2V2/T2
Where,
P1 = initial pressure
V1 = initial volume
T1 = initial temperature
P2 = final pressure
V2= final volume
T2 = final temperature
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