Why do materials get a little larger when they get hotter?
Answers
Related Questions
Calculate the pH of a buffered solution of 0.42 M acetic acid and 0.15 M sodium acetate before AND after 0.0030 moles of NaOH (aq) are added to 0.100 L of the buffer.
Answers
The pH of the buffered solution of 0.42 M acetic acid and 0.15 M sodium acetate before and after 0.0030 moles of NaOH (aq) are added to 0.100 L of the buffer is 4.43 and 4.72, respectively.
A buffer solution is an aqueous solution that resists changes in pH when small amounts of an acid or a base are added to it. A buffer solution is typically made up of a weak acid and its conjugate base, or a weak base and its conjugate acid. The Henderson-Hasselbalch equation, which is used to calculate the pH of a buffer solution, is as follows:pH = pKa + log [A-]/[HA]Where pH is the pH of the buffer solution, pKa is the acid dissociation constant of the weak acid, [A-] is the concentration of the conjugate base, and [HA] is the concentration of the weak acid.Before any acid or base is added, the pH of the buffer solution can be calculated as follows:
Acetic acid (CH3COOH) is a weak acid with a pKa of 4.76. Sodium acetate (CH3COONa) is the conjugate base of acetic acid. Therefore, [A-] = 0.15 M and [HA] = 0.42 M - 0.0030 M = 0.417 M. pH = 4.76 + log (0.15/0.417) = 4.43
After 0.0030 moles of NaOH are added to the buffer solution, they will react with the acetic acid to form sodium acetate and water:
CH3COOH (aq) + NaOH (aq) → CH3COONa (aq) + H2O (l)
The amount of acetic acid that reacts with the NaOH is given by the stoichiometry of the reaction:
0.0030 moles of NaOH react with 0.0030 moles of CH3COOH.
Therefore, the new concentration of CH3COOH is 0.417 M - 0.0030 M = 0.414 M.
The new concentration of CH3COONa is 0.15 M + 0.0030 M = 0.153 M.Using these new concentrations, we can calculate the new pH of the buffer solution:
pH = 4.76 + log (0.153/0.414) = 4.72
Therefore, the pH of the buffered solution of 0.42 M acetic acid and 0.15 M sodium acetate before and after 0.0030 moles of NaOH (aq) are added to 0.100 L of the buffer is 4.43 and 4.72, respectively.
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1. Explain why BCl3 monomer but BH3 exist as B2H6.
Answers
Answer:
See explanation
Explanation:
Both BCl3 and BH3 are electron deficient compounds. In these compounds, boron has six instead of eight electrons surrounding it's outermost shell.
BH3 is able to form a dimmer because of the small size of hydrogen atoms which enable them to be fitted between boron atoms. Large size chlorine atoms can not be fitted between boron atoms hence B2Cl6 does not exist.
6. The function of the general adaptation syndrome (GAS) is to...
a) Return the body to a state of homeostasis.
b)
Enable the body to deal with increasing amounts of stress.
c) Increase the body's awareness of the stress response.
d) Change the body's response to stress.
Answers
Explanation:
C) increase body's awareness of the stress response
The function of the general adaptation syndrome (GAS) is to:
d) Change the body's response to stress.
The general adaptation syndrome (GAS) is a three-stage model that describes how the body responds to stress. The first stage is the alarm reaction, which is when the body releases hormones such as cortisol and adrenaline in response to a perceived threat. The second stage is the resistance stage, which is when the body tries to adapt to the stressor. The third stage is the exhaustion stage, which is when the body's resources are depleted and it can no longer cope with the stressor.
The function of GAS is to change the body's response to stress so that it can better cope with future stressors. This is done by increasing the production of stress hormones, such as cortisol, and by increasing the body's ability to use glucose for energy.
So the answer is (d) Change the body's response to stress.
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Which number indicates the energy level of an atom's valence electrons?
O A. The period number
O B. The group number
O c. The atomic number
O D. The mass number
Answers
Answer:A, The Period Number
Explanation:
just took the test
A buffer solution contains 0.441 m nah2po4 and 0.352 m na2hpo4. determine the ph change when 0.093 mol hclo4 is added to 1.00 l of the buffer. ph change
Answers
The buffer will have a pH of 7.46 + log(0.274M0.146M) = 7.73. In fact, the buffer's acidity is greater than that of the acid's pKa for these ratios of conjugate base to weak acid.
A buffer solution is what?
Buffer solution refers to a solution whose acidity is not significantly changed by the addition of modest amounts of either an acid or a basic. The solution of reserve acidity or alkalinity that resists pH change upon the addition of a modest amount of acid or alkali is known as a buffer.
How acidic is the buffer solution?
The pH range of the following combinations (McIlvaine's buffer solutions) is 3 to 8. Citric acid, monopotassium phosphate, boric acid, and diethyl barbituric acid can be combined to create
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using the paraffin clod method, which sample is likely to have the lower bulk density, natural clod or sticky cube?
Answers
The natural clod sample is likely to have the lower bulk density.
The paraffin clod method is a method for determining the bulk density of soil. In this method, a sample of soil is taken and saturated with water. The wet soil is then placed in a container with melted paraffin wax, which solidifies around the soil to form a "clod" that can be easily removed from the container.
Based on this principle, the sticky cube sample (which presumably contains a higher proportion of fine particles, as indicated by its sticky texture) would have a higher bulk density than the natural clod sample. Therefore, the natural clod sample is likely to have the lower bulk density.
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Photosynthesis takes place in the
-chloroplasts.
-mitochondria.
-nucleus.
-Gol.gi apparatus.
Answers
Answer:
Chloroplast
Explanation:
KINDLY PARAPHRASE THE FOLLOWING PARAGRAPHS:
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Growth in Distribution Spaces
An essential part of the e-commerce business is its supply chain. Figuring out the logistics for packaging and shipping goods to customers includes warehousing, and that’s where commercial real estate comes into play. As e-commerce has grown, we have seen significant growth in the leasing and sale of distribution centers and warehouse spaces.
E-commerce giants look for spaces near large cities like Houston while still having enough space for large buildings. There is a lot of potential and growth in the Houston suburbs such as Katy, Brookshire & Waller. We are seeing more distribution centers popping up in these areas.
Smaller Retail Spaces
As retail has shifted to online, we have seen businesses struggling to keep physical spaces open over the past few years. While e-commerce is booming, some brick-and-mortar spaces are having to close or downsize.
There are certain markets, like groceries, that will always require a physical location, but there is a trend for smaller retail spaces across the market. Smaller spaces mean less inventory in-store, and this consequently encourages a combination of online and in-store shopping. Hybrid shopping especially increased in popularity during the Covid-19 lockdown.
Merging online shopping with curbside or in-store pick-up offered that element of convenience and a safe way to shop during the pandemic, and even as restrictions ease, people will still seek the ease of this approach. However, even though convenience is what mainly drives e-commerce, we don’t expect to see in-store experiences disappear altogether.
Increased Technology in Retail
Since many prefer shopping online, working to translate the benefits of technology to physical spaces has been important in keeping up with trends. Integrating technology into retail spaces will be essential for future leasing and selling opportunities in the market. Implementing tools such as apps can create unique and convenient shopping experiences and can help businesses gather data that is essential for tracking traffic and learning more about the customer.
These tools can also help drive customers to the retail location with special offers or in-store pickup options. Large lifestyle shopping centers have shown to be among the most proactive in blending technology with consumer experiences.
Overall, e-commerce has a major impact on the commercial real estate business, from the industrial real estate benefit from its growth to seeing space buying and leasing becoming a smaller part of retail operations. In 2020 alone, e-commerce accounted for 14 percent of all sales, but it is inevitable that e-commerce will continue to grow as it has for the last decade. Commercial real estate is a reflection of society and its habits and we will continue to see it mirrored as changes in technology and retail emerge.
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Answers
The impact of e-commerce on commercial real estate is significant. E-commerce sales have grown steadily, accounting for a considerable portion of overall sales.
The growth of e-commerce has fueled the demand for distribution spaces, specifically distribution centers and warehouses, which play a crucial role in the supply chain and logistics of packaging and shipping goods to customers. These spaces are sought after by e-commerce giants, who prefer locations near large cities while still providing ample room for large buildings. Suburban areas, such as Katy, Brookshire, and Waller near Houston, are experiencing significant growth in the establishment of distribution centers.
On the other hand, the rise of online shopping has posed challenges for brick-and-mortar retailers. Many physical retail spaces have struggled to remain open or have had to downsize. As a result, there is a trend towards smaller retail spaces, which require less inventory in-store. This trend encourages a combination of online and in-store shopping, known as hybrid shopping. The Covid-19 pandemic further accelerated this trend as consumers sought the convenience and safety of online shopping with options like curbside or in-store pick-up. Even as restrictions ease, this approach is expected to remain popular.
To adapt to the changing retail landscape, integrating technology into physical retail spaces has become crucial. Technology tools, such as mobile apps, can enhance the shopping experience, offer special promotions, and provide valuable data on customer behavior. Retailers, especially large lifestyle shopping centers, have been proactive in blending technology with consumer experiences to stay relevant and attract customers.
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Which of the following chemical reactions will produce a precipitate?
Answers
Answer:
naclo4+koh naoh+kclo4
Explanation:
if you know your cemestry
Answer:
it's A
Explanation:
What could happen if the chemists do not follow the exact formula for medications? (Give examples)
Answers
Answer:
qwe
Explanation:
wqe
GIVING BRAINLIEST
What do the arrows at point 3 indicate?
O Cool air is above water.
O Warm air is above land.
O Warm air is cooling quickly.
O Cool air is warming quickly.
Answers
Answer:
D) Cool air is warming quickly.
Explanation:
d is the answer.
The arrows at point 3 indicates that Warm air is cooling quickly and the correct option is option C.
What is Sea Breeze?Sea breeze is a blowing breeze from sea towards land during the day is called sea breeze.
During the day, the land surface heats up faster than the water surface.
Therefore, the air above the land is warmer than the air above the ocean.
As a result, warm air rises. Therefore, the warmer air over the land surface is rising.
As the warm air over the land is rising, the cooler air over the ocean is flowing over the land surface to replace the rising warm air
Therefore, The arrows at point 3 indicates that Warm air is cooling quickly and the correct option is option C.
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A balloon has a volume of 10,500 liters, and the temperature is 15°C. If the temperature were -25°C, what would the volume of the balloon be?
12,194 L
9,042 L
Answers
12,194 L is the answer!
Explanation:
Water has the maximum density at the temperature of 4°Celsius. So, it expands at temperatures higher or lower than 4°C, knowing that at the temperature of -25°C the water can't have a lower volume than the one at 15°C.
Answer:
12, 194 L
That's your answer!!!
What is the formula for copper(I) phosphate(v)
Answers
Answer:
Cu3PO4
Explanation:
There are two types of chemical compound one is covalent compound and other is ionic compound, covalent compound formed by sharing of electron and ionic compound formed by complete transfer of electron. Therefore, Cu\(_3\)PO\(_4\) is the formula for copper(I) phosphate(v).
What is chemical Compound?Chemical Compound is a combination of molecule, Molecule forms by combination of element and element forms by combination of atoms in fixed proportion.
An ionic compound is a metal and nonmetal combined compound. Ionic compound are very hard. They have high melting and boiling point because of strong ion bond. Cu\(_3\)PO\(_4\) is the formula for copper(I) phosphate(v). Cu\(_3\)PO\(_4\) is an ionic compound with cation Cu⁺¹ and anion as PO₄³⁻.
Therefore, Cu\(_3\)PO\(_4\) is the formula for copper(I) phosphate(v).
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A substance with a high [h+] would likely have which additional characteristics?a. a high [ohâ€" ] and a high poh b. a low [ohâ€" ] and a high pohc. a high [ohâ€" ] and a low poh d. a low [ohâ€" ] and a low poh
Answers
A substance with a high [H⁺] would likely have a low [OH⁻] and a high pOH. Option B is correct.
A substance with a high [H⁺] concentration would be acidic and would typically have a low pH value.
The pH scale ranges from 0 to 14, where a pH of 7 is considered neutral, a pH less than 7 is acidic, and a pH greater than 7 is basic.
This is because, in an acidic solution, the concentration of hydroxide ions [OH⁻] is low, while the concentration of hydronium ions [H₃O⁺] (which is equivalent to [H⁺]) is high. The pOH value is the negative logarithm of the hydroxide ion concentration and is related to pH as follows: pH + pOH = 14.
Therefore, a high [H⁺] concentration would correspond to a low [OH⁻] concentration and a high pOH value.
Hence, B. a low [OH⁻] and a high pOH is the correct option.
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--The question is incorrect, the correct question is
"A substance with a high [H⁺] would likely have which additional characteristics? A) a high [OH⁻] and a high pOH B) a low [OH⁻] and a high pOH C) a high [OH⁻] and a low pOH D) a low [OH⁻] and a low pOH."--
Which two elements make up this mixture, element C and B element C, and an element D and C or element B And D?
Answers
In the molecule C2H4 the valence orbitals of the carbon atoms are assumed to be?
a) dsp hybridized
b) not hybridized
c) sp hybridized
d) sp^3 hybridized
e) sp^2 hybridized
Answers
In the molecule C2H4, valence orbitals of the carbon atoms are assumed to be e) sp^2 hybridized.
What is valence orbitals?The set of orbitals that can energetically accept electrons to create chemical bonds is known as the valence shell. The ns and np orbitals in the outermost electron shell make form the valence shell for main-group elements.
The outside electrons engaged in bonding are called valence electrons. A particular atom can have 0 to 7 valance electrons since valance electrons can only exist in the s and p orbitals. Noble gases are atoms that have no valence electrons and dislike forming bonds.
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What are the chemical and biological indicators of water quality?
Answers
The chemical and biological indicators of water quality are substances that are used to measure the quality of water.
These indicators help to identify the presence of pollutants and other contaminants in water. Some common chemical indicators of water quality include pH, dissolved oxygen, total dissolved solids, and salinity. pH is a measure of the acidity or alkalinity of water, and can indicate the presence of pollutants such as acid rain.
Dissolved oxygen levels can indicate the level of organic matter in the water, while total dissolved solids can indicate the presence of pollutants such as salt. Salinity levels can indicate the presence of pollutants such as chloride.
Biological indicators of water quality include the presence of bacteria, viruses, and other microorganisms. These indicators can help to identify the presence of pathogens that can cause disease in humans and other animals. Some common biological indicators of water quality include fecal coliform bacteria, E. coli, and Giardia.
The presence of these organisms in water can indicate the presence of pollutants such as sewage or animal waste.
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What is the Hall coefficient (RH) in Ccc if the acceptor doping is 4.18∗10∧15/cc, and the donor doping is 9.40∗10∧15/cc ? Three significant figures and exponential notation 1.23e−4
Answers
The Hall coefficient (RH) in this case is approximately -3.01 * 10^-6 C^-1 cc (rounded to three significant figures in exponential notation).
The Hall coefficient (RH) is a parameter used to describe the behavior of charge carriers in a material when subjected to a magnetic field. It is given by the equation RH = 1/(e * p) where e is the elementary charge and p is the total charge carrier density. In this case, we are given the acceptor doping concentration (Na) and the donor doping concentration (Nd) in units of /cc.
To calculate the Hall coefficient, we need to determine the total charge carrier density (p). The total charge carrier density can be calculated as the difference between the acceptor doping concentration and the donor doping concentration: p = Na - Nd.
Given the acceptor doping concentration Na = 4.18 * 10^15/cc and the donor doping concentration Nd = 9.40 * 10^15/cc, we can substitute these values into the equation to find p:
p = Na - Nd
= (4.18 * 10^15/cc) - (9.40 * 10^15/cc)
= -5.22 * 10^15/cc
Now, we can substitute the value of p into the Hall coefficient equation:
RH = 1/(e * p)
= 1/(1.60 * 10^-19 C * (-5.22 * 10^15/cc))
= -3.01 * 10^-6 C^-1 cc
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A student mixes 25g of NaCl with 100.g of H₂O at 25°C . What is the percent concentration of the resulting solution?
20.
25
0.20
0.25
Answers
20 %
Explanation:
becuz 25 divided by 125 multiplied by 100 is 20
Which type of reaction is C1pHO11 12C + 11H,0?
O synthesis
O decomposition
O oxidation
O combustion
Answers
Answer:
C. oxidation ..........
The given reaction is the breaking of the carbohydrate C₁₂H₂₂O₁₁ into 12 C and 11 H₂O. Hence, it is a decomposition reaction .
What is decomposition reaction ?A decomposition reaction is a type of chemical reaction in which a compound breaks down into two or more simpler substances, either through heat, light, or an electrical current.
In a decomposition reaction, a single reactant is converted into two or more products, which can be elements or compounds.
The general equation for a decomposition reaction can be written as:
AB → A + B
where AB is the reactant and A and B are the products.
Decomposition reactions are important in many chemical processes, such as the breakdown of organic matter in soil, the production of industrial chemicals, and the functioning of biological systems.
The given reaction is the decomposition of C₁₂H₂₂O₁₁ into 12 C and 11 H₂O.
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Your complete question is follows:
C₁₂H₂₂O₁₁ ⇒ 11 H₂O + 12 C
Which type of reaction is
O synthesis
O decomposition
O oxidation
O combustion
PLs help pls does anyone know this pls
Answers
Answer:
A graph, luminosity, temperature, decreases
Explanation:
:)
13. A balloon has a volume of 30.0 L and a temperature of 15.0 °C. The volume increased to 36.8 L when the
temperature increased. What was the new temperature?
Answers
Answer: hopefully this helps the new temperature of the balloon is 30.3 °C.
Explanation:
We can use Charles's law to solve this problem, which states that at constant pressure, the volume of a gas is directly proportional to its temperature. This law is expressed by the equation V1/T1 = V2/T2, where V1 and T1 are the initial volume and temperature, and V2 and T2 are the final volume and temperature.
Using the given values, we can set up the equation as follows:
30.0 L / (15.0 °C + 273.15) = 36.8 L / (T2 + 273.15)
Solving for T2, we get:
T2 = (36.8 L / 30.0 L) * (15.0 °C + 273.15) - 273.15
T2 = 30.3 °C
Therefore, the new temperature of the balloon is 30.3 °C.
Which description accurately represents a water molecule? (1 point)
o strongly negative hydrogen poles, strongly positive oxygen pole
o strongly negative oxygen pole, strongly positive hydrogen poles
o slightly negative hydrogen poles, slightly positive oxygen pole
O slightly negative oxygen pole, slightly positive hydrogen poles
Answers
Answer:
Ions in Polar Solvents Quick Check
Explanation:
1. Water dissolves more substances than any other solvent
2. Electron shared between atoms
3. Slightly negative oxygen pole, slightly positive hydrogen poles
4. The electron transfer in ionic compounds results in ions that are attracted to water’s poles.
5. Ionic, yes
The description which accurately represents a water molecule is slightly negative oxygen pole, slightly positive hydrogen poles.
Water is a polar molecule. This means that the molecule has a dipole moment.
The polarity of water arises from the difference in electronegativity between hydrogen and oxygen.
Hence, in water molecule, oxygen is slightly negative and hydrogen is slightly positive thereby resulting in a dipole.
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Question 17 of 34
How is heat transferred when a person holds a pen that is already at body
temperature?
O A. Heat is not transferred.
B. From the pen to the hand
C. In both directions between the pen and the hand
O D. From the hand to the pen
Answers
Answer:
Maybe C but I'm doubtful about D as well
I’m being timed pls help
Answers
You can add the coefficient 6 to equal this out!!
Hope this helps :)
During a chemistry experiment, two colorless liquids were combined in a beaker. The beaker
became warm to the touch. Then a yellow solid settled to the bottom of the beaker. Which
statement best explains the observations?
Answers
The chemical reaction occurs due to which heat energy is released. This type of reaction is also called exothermic reaction.
What is exothermic reaction?Exothermic reactions are those chemical reactions that produce heat or thermal energy to the surrounding environment so we can conclude that chemical reaction occurs when the temperature of the beaker is suddenly increased.
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The molar solubility of AgCl is 6.5 * 10^-3 M AgNO_3 is 2.5 * 106-8 M. In deriving Ksp from these data, which of the following assumptions are reasonable? Circle all that apply.a. Ksp is the same as solubility.b. Ksp of AgCl is the same in 6.5 * 10^?3 M AgNO3 as in pure water.c. Solubility of AgCl is independent of the concentration of AgNO3.d. Ag+ does not change significantly upon addition of AgCl to 6.5 * 10^?3M AgNO3.
Answers
Ag+ does not change significantly upon addition of AgCl to 6.5 * 10^-3M AgNO3.
This assumption is reasonable. When AgCl is added to the AgNO3 solution, the additional Ag+ ions from the AgCl will not significantly change the concentration of Ag+ ions in the solution since AgNO3 is a strong electrolyte and will be the dominant source of Ag+ ions.
a. The assumption that Ksp is the same as solubility is unreasonable. Ksp (the solubility product constant) is the product of the concentrations of the ions in a saturated solution at equilibrium, whereas solubility refers to the concentration of the solute that dissolves in a given solvent. These two concepts are related but not the same, and the Ksp value provides more information about the solubility behavior of a substance.
b. The assumption that Ksp of AgCl is the same in 6.5 * 10^-3 M AgNO3 as in pure water is reasonable. This assumption is based on the fact that AgNO3 dissociates into Ag+ and NO3- ions in water, which do not react with AgCl to form additional compounds. Therefore, the presence of Ag+ ions in the solution does not affect the Ksp value of AgCl.
c. The assumption that solubility of AgCl is independent of the concentration of AgNO3 is reasonable. This assumption is based on the fact that AgCl is a sparingly soluble salt, and its solubility is largely determined by the solubility product constant and the ionic strength of the solution. The concentration of AgNO3, which provides Ag+ ions for the dissolution of AgCl, does not significantly affect the solubility of AgCl.
d. The assumption that Ag+ does not change significantly upon addition of AgCl to 6.5 * 10^-3 M AgNO3 is reasonable. This assumption is based on the fact that the concentration of Ag+ in the solution is much higher than the solubility of AgCl, and therefore the addition of AgCl does not significantly change the concentration of Ag+ ions in the solution.
In summary, the reasonable assumptions are b, c, and d. The unreasonable assumption is a.
a. Ksp is the same as solubility. This assumption is not reasonable. Ksp (solubility product constant) and solubility are related, but they are not the same. Ksp is a constant that represents the equilibrium between a solid and its dissolved ions.
b. Ksp of AgCl is the same in 6.5 * 10^-3 M AgNO3 as in pure water.
This assumption is reasonable. Ksp is a constant that depends only on the temperature, not the concentration of other ions in the solution.
c. Solubility of AgCl is independent of the concentration of AgNO3.
This assumption is not reasonable. The solubility of AgCl will be affected by the concentration of AgNO3 due to the common ion effect, which states that the solubility of a sparingly soluble salt decreases in the presence of a common ion.
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If 10 ml of orange juice has a mass of 5 g, what would the density of Orange
Juice be? (Hint: Density=massivolume)? *
Answers
Answer:
Sep by step to determine the mass of 25 mL of orange juice
Explanation:
Measure mass of container , then add 25 mL of OJ and subtract the difference
You have 150.0 {~mL} of a 0.565 {M} solution of {Ce}({NO}_{3})_{4} . What is the concentration of the nitrate ions in the solution?
Answers
The molecular weight of cerium(IV) nitrate hexahydrate is 446.24 g/mol. Therefore, one mole of cerium(IV) nitrate hexahydrate contains one mole of cerium(IV) ions, which will combine with four moles of nitrate ions to form one mole of cerium(IV) nitrate hexahydrate.
The formula for the concentration of ions in a solution is C = n/V where C is the concentration of ions, n is the number of moles of ions, and V is the volume of the solution in liters. The first step in solving this problem is to calculate the number of moles of cerium(IV) nitrate hexahydrate in 150.0 mL of a 0.565 M solution. This can be done using the following formula:n = M x V n = 0.565 mol/L x 0.150 L= 0.08475 mol of cerium(IV) nitrate hexahydrate This amount contains four times as many moles of nitrate ions as cerium(IV) ions.
Therefore, the number of moles of nitrate ions is: nitrate ions = 4 x 0.08475 militate ions = 0.339 molThe volume of the solution is 150.0 mL, which is equal to 0.150 L. Using the formula given above, we can calculate the concentration of nitrate ions :C = n/V= 0.339 mol/0.150 LC = 2.26 M Therefore, the concentration of nitrate ions in the solution is 2.26 M.
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How is a comet different from a star?
Answers
Explanation:
Bottom line: Most asteroids are rocky bodies that lie within the asteroid belt while comets are dirty snowballs from the Oort Cloud, with some objects acting like a hybrid of these two types.