E Zora wants to dissolve a solute in a solvent quickly. Which best describes what she should do? O decrease the pressure O decrease the surface area O shake it repeatedly O place in a refrigerator Mark this and return Save and Exit Next.
Answers
Answer:
c
Explanation:
By dissolving a solute in a solvent, a solution can be formed. To dissolve the solute in the solvent quickly, the solution must be shaken well. Thus option A is correct.
What is a solution?A solution is a substance formed by a solid solute in a solvent. The solution can be of homogeneous or hetreogenous. A homogenous solution is the one where the solute completely dissolve in the solvent and both the solvent and solute are in one phase.
In heterogenous solution, the solute and solvent are in two different phases due to the incomplete solubility of the solute. The solubility of a solute depends on the bond type of both solvent and solute, weight of solute, temperature and pressure as well mixing mode by shaking.
Some times heating the solution can be a good way to increase the solubility and quick dissolving. Where, the solute-solute interaction decreases and solvent-solute interaction increases.
Similarly, shaking thoroughly will make the solute easily dissolve. Hence, option A is correct.
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Related Questions
Which electromagnetic energy has the highest energy?
Wave 1: frequency of 7.5 MHz (megahertz)
Wave 2: Frequency of 10,000,500 Hz
Wave 3: Frequency of 1.2 GHz (GigaHertz)
a Wave 1
b Wave 2
c Wave 3
Answers
For a wave, as the frequency increases, energy of the wave increases. Hence, the highest frequency wave with 1.2 GHz is most energetic.
What is frequency ?The frequency can be defined as the number of events per unit time. For a wave the number of wave cycle in one second is called its frequency. The unit of frequency is s⁻¹ equivalent to Hz.
For both electromagnetic wave and mechanical waves, frequency is directly proportional to their energy. Hence, as the frequency increases, energy of the wave increases.
1 MHz = 10⁶ Hz and
1 GHz = 10⁹ Hz.
Therefore, the wave with a frequency of 1.2 GHz is having highest energy. Hence, wave 3 is correct.
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spectrum is formed when atoms or molecules are de-excited from higher energy level to lower energy level. a Absorption b Emission C Band d None of the above
Answers
Answer: The answer is Emission
Explanation:
I just got it right on my test, not really good with explaining. hope this helped
Given the empirical formula NO with a molar mass of 59.98 g/mol, what is the molecular formula for this compound
Answers
Answer:
N₂O₂
Explanation:
The empirical formula NO tells us that the number of Nitrogen atoms will always be equal to the number of Oxygen atoms.
The molar mass of the simplest compound, NO, would be:
Molar Mass of NO = Molar Mass of N + Molar Mass of O = 30 g/molWe divide the molar mass of the problem compound by the molar mass of the simplest compound:
59.98 / 30 ≅ 2This means we multiply the empirical formula times 2:
The molecular formula is N₂O₂The molecular formula for this chemical compound (NO) is equal to 2.
Given the following data:
Molar mass of NO = 59.98 g/mol.Scientific data:
Molar mass of oxygen (O) = 16 g/mol.Molar mass of nitrogen (N) = 14 g/mol.How to calculate molecular formula.First of all, we would determine the gram-mass of nitrogen oxide (NO) as follows:
\(NO = 14+16\)
NO = 30 g/mol.
For the molecular formula:
\((NO)n=59.98\\\\30n=59.98\\\\n=\frac{59.98}{30}\)
n = 1.999 ≈ 2.0
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what is the greatest source of radiation most humans are exposed to
Answers
Mark the statement as true or false.
All of the proposed ideas by Dalton, Thomson, and Rutherford are still used in the Modern Theory of the Atom.
true
false
Answers
Answer:
False
Explanation:
The ideas were not proposed
Answer:
false
Explanation:
the ionization energies (kj/mol) of hydrogen (h) , nitrogen (n) , sodium (na) , and oxygen (o) are 1,312, 1,402, 496, and 1,314, respectively. which element combination is least likely? responses
Answers
The least likely element combination would be hydrogen (H) and sodium (Na) since their ionization energies differ significantly.
To determine the least likely element combination, we need to consider the ionization energies and their relative values. The element combination that is least likely would involve elements with similar or close ionization energies.
Comparing the ionization energies:
1,312 kJ/mol (H) < 1,402 kJ/mol (N) < 1,314 kJ/mol (O) < 496 kJ/mol (Na)
Based on these values, the least likely element combination would be hydrogen (H) and sodium (Na) since their ionization energies differ significantly.
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uppose some solid calcium hydroxide is inadvertently transferred along with the saturated liquid for analysis. a) will more, less, or the same amount of hydrochloric acid be used for the analysis in part a? explain. b) how will the molar solubility be affected? explain. c) how will the solubility product constant k sp be affected? explain
Answers
The additional calcium hydroxide will react with some of the hydrochloric acid, leading to a higher consumption of the acid for the analysis.
If solid calcium hydroxide is inadvertently transferred along with the saturated liquid for analysis, the following effects can be expected:
a) More hydrochloric acid will be used for the analysis in part a. This is because calcium hydroxide reacts with hydrochloric acid to form calcium chloride and water according to the following equation:
Ca(OH)₂ + 2HCl → CaCl₂ + 2H₂O
b) The molar solubility of calcium chloride will decrease due to the additional calcium hydroxide. This is because calcium hydroxide reacts with calcium chloride in the solution to form calcium carbonate, which is insoluble in water:
CaCl₂ + Ca(OH)₂ → CaCO₃ + 2H₂O
As a result, more calcium carbonate will precipitate out of the solution, leading to a decrease in the molar solubility of calcium chloride.
c) The solubility product constant (Ksp) of calcium hydroxide will increase due to the additional solid. This is because the presence of more calcium hydroxide will increase the concentration of calcium and hydroxide ions in the solution, shifting the equilibrium towards the formation of more solid calcium hydroxide. This will increase the value of Ksp, indicating a higher degree of saturation of the solution with respect to calcium hydroxide.
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How many possible values are there for the quantity "c", considering a specific chemical reaction represented by the equation aA+bB--> cC +dD, in this equation the letters A,B,C and D represent chemicals, and the letters a,b,c and d represent confessions in the balanced equation.
Answers
Answer:
There is only one possible value for the quantity "c"
Explanation:
There is only one possible value for the quantity "c". This is because the a,b,c and d represent number of moles in he balanced equation. And since the number of moles of a particular substance (atom or compound) in a balanced equation must be distinct, it (the substance) can only have one value. For example, consider the equation below
2C₂H₂ + 5O₂ ⇒ 4CO₂ + 2H₂O
It can be seen from the above equation that the individual number of moles are distinct and have just one possible value. And if C₂H₂ is A, O₂ is B, CO₂ is C and H₂O is D, then 4 is "c".
Thus, "c" is the number of moles for the substance "C" with just one possible value.
Why couldn’t a Na+ ion form by adding a proton to a Na atom
Answers
A sodium ion (Na+) cannot be formed by simply adding a proton (H+) to a sodium atom (Na) because the formation of ions involves the loss or gain of electrons, not protons.
Protons are positively charged particles found in the nucleus of an atom, while electrons are negatively charged particles orbiting around the nucleus.
In an atom, the number of protons is equal to the number of electrons, resulting in a neutral charge. However, when an atom gains or loses electrons, it acquires a net positive or negative charge, forming an ion.
In the case of sodium (Na), it has 11 protons and 11 electrons. To form a sodium ion (Na+), it needs to lose one electron because it is easier for atoms in the sodium group to lose an electron and achieve a stable electron configuration with a filled outermost energy level (valence shell). By losing one electron, sodium achieves the stable electron configuration of the noble gas neon.
When a proton is added to a sodium atom, it would result in a new element, hydrogen (H), with a different atomic number. The atomic number of an element corresponds to the number of protons in its nucleus. Therefore, adding a proton to a sodium atom would not result in the formation of a sodium ion.
In summary, the formation of ions involves the loss or gain of electrons, not protons. Sodium (Na) forms a sodium ion (Na+) by losing one electron, not by adding a proton.
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20 Points!!
If I ran through the rain, what would my body use for energy?
•The steak I ate because it's a protein.
•RNA
•The pasta I ate because it's a •carbohydrate.
•DNA
Answers
Answer:
the steak I ate because its protein
What will the pressure be if 89.9 moles of argon are contained in a 12.0 L cylinder that is pressurized at a temperature of 300 K?
Answers
Done!
How many grams of Ca(OH), are needed to make a 0.250 M solution with a volume of 100 mL? Your answer should have three significant figures.
Answers
1.852 grams of Ca(OH)2 are needed to make a 0.250 M solution with a volume of 100 mL.
To calculate the grams of Ca(OH)2 needed to make a 0.250 M solution with a volume of 100 mL, we need to use the formula:
Molarity (M) = moles of solute / volume of solution in liters
First, we need to convert the given volume to liters:
Volume = 100 mL = 100/1000 L = 0.1 L
Next, we rearrange the formula to solve for moles of solute:
moles of solute = Molarity × volume of solution in liters
moles of solute = 0.250 M × 0.1 L = 0.025 moles
Finally, we need to convert moles of Ca(OH)2 to grams using its molar mass:
Molar mass of Ca(OH)2 = 40.08 g/mol + 2(16.00 g/mol) + 2(1.01 g/mol) = 74.09 g/mol
grams of Ca(OH)2 = moles of solute × molar mass of Ca(OH)2
grams of Ca(OH)2 = 0.025 moles × 74.09 g/mol = 1.85225 g
Therefore, approximately 1.852 grams of Ca(OH)2 are needed to make a 0.250 M solution with a volume of 100 ml.
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A solution of NaCl was prepared in the following manner: 0.0842 g of NaCl is massed out on an analytical balance. The solid is transferred to a 25.00 mL volumetric flask. Deionized water is added to the flask such that the bottom of the meniscus is at the line. A 1.00 mL aliquot of the stock solution is transferred to a 50.00 mL volumetric flask using a volumetric pipet and diluted to volume. 6. Calculate the concentration of NaCl in the resulting solution in mg/L NaCl. (answer = 67.4 mg/L) 7. Calculate the concentration of NaCl in the resulting solution using propagation of error through the calculation. Use the manufacturer's tolerance values as the absolute error. The tolerances can be found in Chapter 2 of the Harris text. Assume a Class 1 balance and Class A glassware. Treat the tolerances as random error. (answer = 67.4+0.4 mg/L) 8. Identify 2 possible sources of random (indeterminate) error. Identify 2 possible sourses of systematic (determinate) error.
Answers
Two possible sources of systematic (determinate) error in the experiment are; Incorrect calibration of volumetric glasswareIncorrect mass of NaCl
To calculate the concentration of NaCl in the resulting solution in mg/L NaCl, we can use the formula; Concentration (mg/L) = (Mass of solute ÷ Volume of solution in L) × 1000 g / 1 mg NaCl is present in the stock solution of 25 mL. So, the mass of NaCl in the solution would be;0.0842 g ÷ 25 mL = 0.00337 g/mL. Now, in the resulting solution, a 1.00 mL aliquot of the stock solution is transferred to a 50.00 mL volumetric flask and diluted to volume. Therefore, the volume of the resulting solution is 50.00 mL. We will substitute these values in the formula, Concentration (mg/L) = (0.00337 g/mL ÷ 50 mL) × 1000 g / 1 mg concentration (mg/L) = 67.4 mg/L. Therefore, the concentration of NaCl in the resulting solution in mg/L NaCl is 67.4 mg/L.7. Concentration = 67.4 mg/LTolerance = 4.28 mg/LTotal concentration = 67.4 + 4.28 mg/L = 71.68 mg/LWe round off this value to one decimal place; Total concentration = 71.7 mg/LTherefore, the concentration of NaCl in the resulting solution using propagation of error through the calculation is 67.4+0.4 mg/L.8. Two possible sources of random (indeterminate) error in the experiment are; Errors in temperature measurement. Errors in measurement of water volume. Two possible sources of systematic (determinate) error in the experiment are; Incorrect calibration of volumetric glasswareIncorrect mass of NaCl.
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What is true when a reaction has reached equilibrium?
The reaction is faster in the forward direction.
The reaction has stopped.
The reaction rate is equal in both directions.
The reaction is faster in the reverse direction.
Answers
Three different samples were weighed using a different type of balance for each sample. The three were found to have masses of 0.5183761 kg, 9.342 mg, and 5076.6 g. The total mass of the samples should be reported as:
Answers
The total mass of the samples should be reported as 5077.46 grams.
To calculate the total mass of the samples, we need to convert all the masses to the same unit.
The first sample has a mass of 0.5183761 kg. Since 1 kilogram is equal to 1000 grams, the mass of the first sample is 0.5183761 kg * 1000 g/kg = 518.3761 grams.
The second sample has a mass of 9.342 mg. Since 1 milligram is equal to 0.001 grams, the mass of the second sample is 9.342 mg * 0.001 g/mg = 0.009342 grams.
The third sample has a mass of 5076.6 g, which is already in grams.
Now we can add up the masses of all three samples:
Total mass = 518.3761 grams + 0.009342 grams + 5076.6 grams = 5077.46 grams.
Therefore, the total mass of the samples should be reported as 5077.46 grams.
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PLEASE HELP ASAPPPPPPPPPPP!!!!!!!!!!!!!!1
Electric Energy Net Generation by Resource (as of 2007)
Resource Percentage
coal 48.5
natural gas 21.6
uranium 19.4
hydroelectric 5.8
petroleum 1.6
biomass about 1.0
geothermal <1.0
solar and other <1.0
wind <1.0
other gases 0.3
What percentage of energy generation is produced by fossil fuels?
Answers
Answer:
63%
Explanation:
About 63% of this electricity generation was from fossil fuels—coal, natural gas, petroleum, and other gases. About 20% was from nuclear energy, and about 18% was from renewable energy sources.
Hope this helped you!
Answer:
\(71.7\%.\)
\(Coal, \: crude \: oil, \: and \: natural \: \\ gas \: are \: all \: considered \: fossil \: fuels \\ coal \: 48.5 \\ natural \: gas \: 21.6 \\ petroleum \: 1.6
\)
\(the \: sum \: of \: the \: three \:: \\ (48.5+ 21.6+ 1.6) = 71.7.\)
The vapor pressure of ethanol at 25 degrees Celsius is 58.7mmHg. Calculate the vapor pressure in arm and torr. Round each of your answers 3 significant digits.
Answers
The vapor pressure of ethanol at 25 degrees Celsius is approximately 0.0779 atm and 78.5 torr.
To calculate the vapor pressure in atm, we convert the given value from mmHg to atm by dividing it by 760 mmHg/atm. Therefore, 58.7 mmHg / 760 mmHg/atm = 0.0779 atm.
To calculate the vapor pressure in torr, we can directly use the given value. Therefore, the vapor pressure of ethanol at 25 degrees Celsius is approximately 78.5 torr.
So, the vapor pressure of ethanol at 25 degrees Celsius is estimated to be 0.0779 atm or 78.5 torr.
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The energy of a pendulum is recorded at different positions in the table below. Use the data in the table to determine the amount of kinetic energy the pendulum had at Position 2. dude i will give yall brainlest
Answers
Answer:
36.55 J
Explanation:
PE = Potential energy
KE = Kinetic energy
TE = Total energy
The following data were obtained from the question:
Position >> PE >>>>> KE >>>>>> TE
1 >>>>>>>> 72.26 >> 27.74 >>>> 100
2 >>>>>>>> 63.45 >> x >>>>>>>> 100
3 >>>>>>>> 58.09 >> 41.91 >>>>> 100
The kinetic energy of the pendulum at position 2 can be obtained as follow:
From the table above, at position 2,
Potential energy (PE) = 63.45 J
Kinetic energy (KE) = unknown = x
Total energy (TE) = 100 J
TE = PE + KE
100 = 63.45 + x
Collect like terms
100 – 63.45 = x
x = 36.55 J
Thus, the kinetic energy of the pendulum at position 2 is 36.55 J.
6
What is the density of a substance that has a mass of 2.0 g, and when placed in a graduated cylinder
the volume changed from 70 mL to 75 mL?
A 2.5 g/mL
B 7.0 g/mL
C 10. g/mL
D 0.40 g/mL
Answers
The density of the substance having a mass of 2.0 g is 0.4 g/mL (Option D)
How do I determine the density of the substance?First, we shall obtain the volume of the substance. This can be obtained as follow:
Volume of water = 70 mL Volume of water + substance = 75 mL Volume of substance =?Volume of substance = (Volume of water + substance) - (Volume of water)
Volume of substance = 75 - 70
Volume of substance = 5 mL
Finally, we shall determine the density of the substance. This is illustrated below:
Mass of substance = 2.0 gVolume of substance = 5 mLDensity of substance = ?Density = mass / volume
Density of substance = 2 / 5
Density of substance = 0.4 g/mL
Thus, the density is 0.4 g/mL (Option D)
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the reaction, at 50% yield, produces 4.0 moles of n2. what was the mass of hydrazine used? assume that o2 is in excess.
Answers
N2(g) + 2 H2O N2(g) + O 2(g) (g) At a 50% yield, the process generates 4.0 moles of N2. Therefore, 4.0 * 100 / 50 = 8.0 moles of hydrazine are used to produce the theoretical yield of N2.
Are rockets still powered by hydrazine?
Hydrazine is still used in some military vehicles nowadays, but it's mainly used for extraterrestrial exploration. Hydrazine was used to help the Curiosity Rover touch down on Mars in 2012. Since then, it has been living there.
Why is hydrazine such a poison?
Since the liquid is caustic, both humans and animals who come into touch with it may develop dermatitis. Animals who were chronically (over a lengthy period of time) exposed to hydrazine through inhalation have shown effects on their thyroid, liver, spleen, and lungs.
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SEP Construct an Explanation What challenges do the three industries have in making better batteries? What solutions are being suggested?
Answers
The three industries commonly associated with battery technology are the automotive, electronics, and renewable energy sectors. Each of these industries faces specific challenges when it comes to developing better batteries.
Automotive Industry:
Energy Density: One of the primary challenges for electric vehicles (EVs) is improving battery energy density, which refers to the amount of energy that can be stored per unit of volume or weight. Higher energy density batteries would allow for longer driving ranges and reduced charging times.Cost: Batteries constitute a significant portion of an electric vehicle's cost. Therefore, reducing the cost of battery production is crucial for making EVs more affordable and competitive with traditional internal combustion engine vehicles.Charging Infrastructure: The limited availability of charging stations and relatively longer charging times compared to refueling a conventional vehicle remain challenges. The industry is focusing on expanding charging infrastructure and developing fast-charging technologies to address this issue.Electronics Industry:
Power Density: Electronic devices, such as smartphones and laptops, require batteries with high power density to support their energy-intensive operations. However, increasing power density while maintaining safety and minimizing size is a challenge.Battery Lifespan: Consumers expect electronic devices to have a longer battery life before needing a recharge. Enhancing battery lifespan through improved materials, design, and management systems is an ongoing pursuit.Environmental Impact: The electronics industry is increasingly concerned about the environmental impact of batteries, particularly regarding the disposal and recycling of lithium-ion batteries. Developing sustainable and eco-friendly battery technologies is a suggested solution.Renewable Energy Industry:
Energy Storage Capacity: Renewable energy sources like solar and wind are intermittent, meaning they are not continuously available. Efficient energy storage solutions are needed to store excess energy produced during peak times and supply it during periods of low or no generation. Integration with the Grid: Integrating renewable energy sources with the existing electrical grid is a challenge due to fluctuations in supply and demand. Advanced battery technologies can help stabilize the grid by providing rapid response and balancing services.Durability and Longevity: Renewable energy projects, such as utility-scale installations, require long-lasting and durable batteries that can withstand frequent charge-discharge cycles without significant degradation. Enhancing battery life and reliability is a focus for the industry.For such more questions on technology
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Rocks that form from lava does not contain fossils. Explain why
Answers
As sedimentary rocks are formed from the accumulation of sediment, fossils can be buried and preserved over time, leading to the formation of fossil-rich sedimentary rocks.
What is Fossils?
Fossils are the remains or traces of prehistoric plants, animals, and other organisms that are preserved in rocks. Fossils provide valuable insights into the evolution of life on Earth, as they can help scientists to understand the types of organisms that lived in the past, how they evolved, and how they interacted with their environment.
Rocks that form from lava, such as igneous rocks, typically do not contain fossils because the high temperatures involved in the formation of lava can destroy organic matter, including the remains of plants and animals.
When lava flows onto the surface of the Earth, it can quickly cool and solidify, forming an igneous rock. This rapid cooling process does not allow for the preservation of any organic material that might have been present in the lava, including fossils.
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n²+ 3h²+ 2nh³ are any atoms being created or destroyed, explain
Answers
No, there are no atoms being created or destroyed in the given expression. It does not involve any elements or compounds found in chemistry, and therefore, it does not involve any atoms being created or destroyed.
The expression n²+ 3h²+ 2nh³ is a mathematical equation and does not involve any physical or chemical process that can create or destroy atoms. The equation represents a polynomial function with variables n and h raised to various powers and multiplied by coefficients. It is simply a mathematical representation of a relationship between two variables and does not have any bearing on the conservation of matter.
The law of Conservation of Mass states that matter cannot be created or destroyed, only transformed from one form to another, and this equation does not involve any such transformation. Therefore, it can be concluded that no atoms are being created or destroyed in the given expression.
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An ion that consists of 7 protons, 9 neutrons, and 10 electrons has a net charge of
A) 2–
B) 2+
C) 3+
D) 3–
The answer is D. Why the answer is not A but D? Can you explain?
Answers
The net charge of the ion that consists of 7 protons, 9 neutrons, and 10 electrons will be -3.
HOW TO CALCULATE NET CHARGE:
The net charge of an ion can be calculated by subtracting the number of electrons from the number of protons in an atom. That is;net charge = no. of protons - no. of electrons
The number of protons is the number of positive charges while the number of electrons is the number of negative charges in an atom. Therefore, if an ion consists of 7 protons, 9 neutrons, and 10 electrons, the net charge is as follows:net charge: 7 - 10
net charge = -3
Therefore, the net charge of the ion that consists of 7 protons, 9 neutrons, and 10 electrons will be -3.Learn more: https://brainly.com/question/21430387?referrer=searchResults
eter explores the periodic table and how atoms can combine to form compounds. He uses beads with different sizes and colors as models. Each different type of bead represents atoms from a different element.
How can Peter best use the beads to show how compounds form in nature?
Answers
Answer is B- He can arrange the beads into various formations using different colors and sizes multiple times
Explanation: I hope the helped!
Peter can arrange the beads into various formations using different colors and sizes multiple times.
What is Periodic Table ?The periodic table, also known as the periodic table of the elements, is a tabular display of the chemical elements. It is widely used in chemistry, physics, and other sciences, and is generally seen as an icon of chemistry.
In order to show how compounds form in nature, the beads will be assigned to the different elements on the periodic table according to the following arrangements;
The beads representing the elements of each group in the periodic table will all have the same colorThe sizes of the beads within each group will increase from the top to the bottom of the groupWith the above arrangements, it will be possible to show the affinity and proportion of the elements in the compound formed in nature.
Therefore, Peter can arrange the beads into various formations using different colors and sizes multiple times.
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what does code zero mean in a science lab
Answers
Answer:
either expolshion or hide
Explanation:
so be ware :O
Oleoyl-CoA is derived from oleic acid, 18:1. Explain in steps,
how oleic acid was converted to oleoyl-CoA.
Answers
"Oleic acid, 18:1, is converted to oleoyl-CoA through a series of enzymatic reactions." Oleic acid, an 18-carbon fatty acid with one double bond (18:1), undergoes a process called β-oxidation to form oleoyl-CoA.
In the first step, oleic acid is activated by an enzyme called acyl-CoA synthetase. This enzyme catalyzes the reaction between oleic acid and a molecule called Coenzyme A (CoA), resulting in the formation of oleoyl-CoA. The activation step is essential for the subsequent breakdown of the fatty acid.
Once oleoyl-CoA is formed, it enters the β-oxidation pathway. In this pathway, the fatty acid is sequentially broken down into two-carbon units in a series of reactions. The first step of β-oxidation involves the oxidation of the fatty acid at the β-carbon position, which is catalyzed by an enzyme called acyl-CoA dehydrogenase. This oxidation reaction generates a double bond between the second and third carbon atoms, converting oleoyl-CoA to 3-trans-enoyl-CoA.
The next steps involve hydration, oxidation, and thiolysis reactions, which result in the formation of acetyl-CoA molecules. These reactions are catalyzed by specific enzymes in the β-oxidation pathway. Through these steps, oleoyl-CoA is ultimately converted into acetyl-CoA, which can be further utilized by the cell as a source of energy or for the synthesis of other compounds.
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what is the molarity of a solution containing 54.1 g of mgcl2 dissolved in 1.00 l of solution? what is the molarity of a solution containing 54.1 of dissolved in 1.00 of solution? 54.1 m 0.541 m 1.76 m 0.568 m
Answers
The molarity of the solution including 54.1 g of MgCl₂ dissolved in 1.00 L of solution is 0.568 M.
To find the molarity (M) of a solution, it is required to divide the moles of solute by the volume of the solution in liters.
First, determine the moles of MgCl₂ in the solution.
The molar mass of MgCl₂ is:
Mg: 24.31 g/mol
Cl: 35.45 g/mol x 2 = 70.90 g/mol
= 24.31 g/mol + 70.90 g/mol
= 95.21 g/mol
To find grams to moles, divide the given mass by the molar mass:
moles of MgCl₂ = 54.1 g / 95.21 g/mol = 0.568 moles
Next, it is required to moles of solute by the volume of the solution:
Molarity (M) = moles of solute ÷ volume of solution in liters
Molarity (M) = 0.568 moles ÷ 1.00 L
= 0.568 M
Thus, the molarity of the solution consisting 54.1 g of MgCl₂ dissolved in 1.00 L of solution is 0.568 M.
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How does electronegativity change as principal energy levels are added to an atom?
A. Electronegativity decreases.
B. Electronegativity does not change.
C. Electronegativity increases.
D. Electronegativity can increase or decrease; it cannot be known.
+ Answer needed ASAP. will mark as brainliest.
Answers
Answer:A
Explanation: Since more energy levels are added, the pull decreases which means the electronegativity from electrons also decrease.
The electronegativity change as principal energy levels are added to an atom is electronegativity decreases. The correct option is A.
What is electronegativity?The ability of an atom to draw shared electrons in a covalent connection is referred to as electronegativity. The stronger an element attracts the shared electrons, the higher its degree of electronegativity.
As a result, the electronegativity of an element drops as you advance down a group on the periodic table because the larger number of energy levels distances the outside electrons from the nucleus' pull. On the periodic table, electronegativity rises from left to right across each period.
Thus, the correct option is A. Electronegativity decreases regarding the electronegativity decreases with energy levels added.
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Which model represents an element?
Answers
Answer: Water. Earth. Fire. Air.
Explanation: the four nations lived together in harmony. Then, everything changed when the Fire Nation attacked. Only the Avatar, master of all four elements, could stop them, but when the world needed him most, he vanished. A hundred years passed and my brother and I discovered the new Avatar, an airbender named Aang. And although his airbending skills are great, he has a lot to learn before he's ready to save anyone. But I believe Aang can save the world."