calculate the number of vacancies per cubic meter in gold at 900 o c. the energy for vacancy formation is 0.98 ev/atom and the density and atomic weight for au are 19.32 g/cm3 and 196.9 g/mol, respectively
Answers
The number of vacancies is given as,
\(N_{v}\) = N exp\((-\frac{Q_{v} }{KT}) = \frac{N_{A}P_{AU} }{A_{AU} } exp(-\frac{Q_{v} }{KT})\)
= (6.023 x 10²³ atoms/mol) (18.63 g/cm³)/ 196.9 g/mol exp [0.98 eV/atom/ (8.62 x 10-5 eV/atom-K) (1173 K)]
= 3.52 x 10¹⁸ cm3 = 3.52 x 10²⁴ m⁻³.
The vacancy rate is also called the vacancy rate. Calculating the vacancy rate is easy. Divide the number of available units by the total number of units in the complex. To calculate the economic vacancy rate for rental housing.
In real estate terminology, the term vacancy refers to the potential unrealized return on an investment property. This is usually defined as the percentage of units currently available within a given portfolio. you can divide the total amount of rent lost during the period of vacancy by the total number of potential rents you can earn in a year.
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Related Questions
what is a ball and socket joint?
Answers
Answer:
spheroidal joint
Explanation:
Ball-and-socket joint, also called spheroidal joint, in vertebrate anatomy, a joint in which the rounded surface of a bone moves within a depression on another bone, allowing greater freedom of movement than any other kind of joint.
Help!! i have a test
use the information and table to answer the following question.
a student is planning to determine the specific heat capacity of iron. to do
this experiment the student will need to perform the following procedures:
step
procedure
1 measure the mass of the iron sample.
measure the initial temperature of a
known volume of water.
3 heat the iron sample.
4 place the iron sample in the water.
n
.
5
choose...
what is step 5 in the experiment?
Answers
Step 5 in the experiment would involve measuring the final temperature of the water after placing the iron sample in it. This step is crucial to determine the change in temperature of the water due to the transfer of heat from the iron sample.
By measuring the initial and final temperatures of the water, the student can calculate the amount of heat gained by the water and subsequently use this information to determine the specific heat capacity of iron To determine the specific heat capacity of iron, step 5 in the experiment would involve measuring the final temperature of the water after placing the heated iron sample in it. By measuring the initial and final temperatures of the water and knowing the mass of the water, the student can calculate the heat gained by the water. Since the heat gained by the water is equal to the heat lost by the iron sample, the specific heat capacity of iron can be calculated by dividing the heat lost by the iron sample by its mass and the change in temperature.
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Why do you think the different heating process result in different softness or hardness of the steel? Think about what steel is made of and how the atoms move .
Answers
Explanation:
Different heating process affect the microstructure of the steel in different ways. Thus, imparting different properties to the steel. For example, annealing is done is done to impart softness to steel, hardening is done to hardened the steel( eg: carburizing, nitriding, cyaniding) whereas tempering is done to improve the ductility of the steel.
Steel mainly contains iron and carbon. This percentage of carbon and iron decides the property of the steel. It is the % of carbon which is altered in different heating process that to obtained the desire microstructure in steel.
Tommy wakes up in the morning to his alarm clock at 7:00 a.m. every day. The alarm clock is connected to a wall outlet. Which statement best describes the energy transformation that is happening in the alarm clock?
The alarm clock is producing electrical energy, and the electrical energy is being transformed into light and sound energy.
Electrical energy is flowing through the wires into the alarm clock. The electrical energy is being transformed into sound energy by the buzzer.
Electrical energy is being produced by the alarm clock. The electrical energy is being transformed into sound energy by the buzzer and into light energy by the light bulbs.
Electrical energy is flowing through the wires into the alarm clock. The electrical energy is being transformed into heat energy by the buzzer and into light energy by the light bulbs.
Answers
The statement that best describes the energy transformation that is happening in the alarm clock is "Electrical energy is flowing through the wires into the alarm clock. The electrical energy is being transformed into sound energy by the buzzer"
ENERGY TRANSFORMATION:
Energy exists in different forms and can be transformed from one form to another. According to this question, the alarm clock being described is plugged to a wall outlet, meaning that electrical energy is flowing through the wire into the alarm clock. The alarm clock produces a buzzing sound as a result of this energy flow. Therefore, statement that best describes the energy transformation that is happening in the alarm clock is "Electrical energy is flowing through the wires into the alarm clock. The electrical energy is being transformed into sound energy by the buzzer".Learn more at: https://brainly.com/question/22939972?referrer=searchResults
Answer: B
Explanation: In physics, sound energy is a form of energy that can be heard by living things. Only those waves that have a frequency of 16 Hz to 20 kHz are audible to humans. However, this range is an average and will slightly change from individual to individual. Sound waves that have frequencies below 16 Hz are called infrasonic and those above 20 kHz are called ultrasonic. All electricity is produced via a generator, but how the turbine in that generator is powered can vary hugely. 3 of the most common ways are:
Coal – coal is burned in a power plant to heat water, which turns into steam and turns the turbine.
Hydropower – water is channeled through a man-made space and turns a turbine. ...
Nuclear – while the process of nuclear fission is quite complicated, the resulting heat it creates is used to generate steam (just like coal) which then turns the turbines.
What accounts for the fact that liquid mercury forms into tight beads while ethyl alcohol do not?
Answers
Answer:
Pretty sure this is wrong but worth a shot
Explanation:
Ethyl Alcohol is a clear, colorless liquid with a wine-like odor. It is used in alcoholic . Do not rely on odor alone to determine ... This chemical is on the Special Health Hazard Substance. Ethyl Alcohol can affect you when inhaled and by passing through the Ethyl Alcohol may form an ignitable vapor/air mixture in.
which gas is not an example of a naturally occurring greenhouse gas?responsesnitrous oxidenitrous oxidemethanemethanechlorofluorocarbonchlorofluorocarbonwater vapor
Answers
Chlorofluorocarbons (CFCs) are not naturally occurring greenhouse gases.
Chlorofluorocarbons (CFCs) are not naturally occurring greenhouse gases. They are synthetic compounds that were widely used in refrigerants, solvents, and aerosol propellants.
CFCs were found to deplete the ozone layer in the upper atmosphere, leading to the adoption of the Montreal Protocol to phase out their use.
While they are not naturally occurring, they contribute significantly to global warming due to their strong greenhouse effect.
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solve with steps plz
Answers
I think it's b
let's work out empirical formula:
CO2 + H20 is CH2O3
the mass of CH2O3 is 12+2+(16×3)=62
work out mass of CO2
mass=number of moles × relative formula mass
mass=1.5 mol × 44 = 66
work out mass of H20
mass=number of moles × relative formula mass
mass=2 × 18 = 36
so the molecular formula is 66+36=102
to calculate simplest molecular formula:
molecular formula mass/empirical formula mass
102/62=2 (rounded to nearest whole number)
back to the empirical formula which is CH2O3
multiply each element by 2 which is
C2H4O6
answer:C2H4
not 100% sure though, but I hope it's been of some use to you:)
Mass of CO_2
\(\\ \sf\longmapsto No\:of\:moles(Molar\:mass)\)
\(\\ \sf\longmapsto 44(1.5)\)
\(\\ \sf\longmapsto 66g\)
And
Molar mass of water=18g/molNo of moles=2Mass of H_2O
\(\\ \sf\longmapsto 2(18)=36g\)
Total mass of products
\(\\ \sf\longmapsto 66+36=102g\)
EMPIRICAL FORMULA:-CH_2O_3
Empirical formula mass:-\(\\ \sf\longmapsto 12+2(1)+3(16)=12+2+48=62g\)
We need n now
\(\\ \sf\longmapsto n=\dfrac{Molecular\:mass\:of\; products}{Empirical\: formula\:mass}\)
\(\\ \sf\longmapsto n=\dfrac{102}{62}\)
\(\\ \sf\longmapsto n=1.64\approx 2\)
Now
\(\\ \sf\longmapsto Molecular\: formula=n(Empirical\: formula)\)
\(\\ \sf\longmapsto 2(CH_2O_3)\)
\(\\ \sf\longmapsto C_2H_4O_6\)
It's Ethene Oxide .
Answer is Ethene(C_2H_4)
Option B is correct
PLEASE HELP 100 POINTS!!!! AND GIVING BRAINLIEST!!!!!!!!
Why should a movie producer consider filming a new version of The First Men in the Moon? Create a 6-8 slide multimedia presentation to market your idea for this movie to a production company. Rubric Criteria Points Possible 20 (10) 11-19 (6-9) 6-10 (3-5) 0-5 (0-2) Points Earned Ideas & Content Relates Theme of Novel Provides analysis of character Accurate diagram of plot 20 Establishes a theme, relates an analysis of the protagonist, effectively summarizes the plot, and maintains a clear focus throughout. Establishes a theme, identifies some character traits of the protagonist, provides a summary of the plot, and maintains focus throughout. There are a few lapses in focus, but the theme is fairly clear. Presents somewhat of an analysis of character. The plot summary is mostly correct. It is difficult to figure out the theme of the novel. The character analysis is poor or not present. The plot summary does not accurately represent the story. Organization Structure Precision Focus 20 Strong organization; seamless transitions between ideas; Effective and precise content. Organization is appropriate but conventional; Attempt at a focused and precise sales pitch. Attempts at organization, inappropriate use of lists or bullets; content is unfocused and ideas are not developed No clear organizational framework or transitions. Ideas are vague or unfocused Voice Personality Sense of audience 20 Strong awareness of audience in the design. Students can clearly explain why they felt the vocabulary, audio and graphics chosen fit the target audience. Some awareness of audience in the design. Students can partially explain why they felt the vocabulary, audio and graphics chosen fit the target audience. Some awareness of audience in the design. Students find it difficult to explain how the vocabulary, audio and graphics chosen fit the target audience. Limited awareness of the needs and interests of the target audience. Images and Music Relevance to theme Effectiveness Imagery 10 Images and music stir a rich emotional res
Answers
Answer:-Science have researched more facts and cool things about it-It would have more facts and things to learn-The quality would be better and more understandingI just tried 3 quick ideas I hope it can help a bit
Explanation:
Answer:
the answer is you should know this already :)))))))))))))))))))))))))))))))))))))))))))))))))))
A process which is unfavorable with respect to enthalpy, but favorable with respect to entropy Group of answer choices could occur at high temperatures, but not at lower temperatures. could not occur regardless of temperature. could occur at any temperature. could occur at low temperatures, but not at higher temperatures. none of the above
Answers
Answer:
could occur at any temperature.
Explanation:
The spontaneity of a reaction is what determines whether the reaction will occur or not. A spontaneous reaction occurs easily.
The spontaneity of a reaction is predicted by the sign of ∆G.
When ∆G is positive, the reaction is not spontaneous. When ∆G is negative, the reaction is spontaneous.
Note that;
∆G= ∆H - T∆S
Where;
∆H = Change in enthalpy
∆S = Change in entropy
T= temperature
If ∆H is unfavourable and ∆S is favourable, the reaction can proceed at all temperatures because ∆G will always be negative.
It should be noted that a process that is unfavorable as regards to enthalpy, but favorable with respect to entropy could occur at any temperature.
Enthalpy(∆H) serves as amount of internal energy that a compound has, entropy( ∆S) on the other hand serves as intrinsic disorder within the system.
However, spontaneity of a reaction determines likely hood of occurrence of a reaction, when the process is spontaneous, it makes the reaction to occurs easily.
We can conclude that whenever enthalpy is unfavourable and entropy of a system is favourable, then the spontaneity will be negative and the reaction will occur at any temperature.
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which reaction is faster?why?
Answers
Answer:no answer
Explanation:
Temperature. Usually reactions speed up with increasing temperature. Physical state of reactants. Powders react faster than blocks - greater surface area and since the reaction occurs at the surface we get a faster rate.
Find the pH of the equivalence point(s) and the volume (mL) of 0.0372 M NaOH needed to reach the point(s) in titrations of(a) 42.2 mL of 0.0520 M CH₃COOH
Answers
The pH of the equivalence points is 8.54
Concept of pH
A solution's acidity or alkalinity can be determined based on the concentration of hydrogen ions in the solution, or pH. Acidic aqueous solutions at 25 °C have a pH under 7, while basic or alkaline aqueous solutions have a pH above 7. Since the concentration of H3O+ is equal to the concentration of OH in pure water, a pH level of 7.0 at 25°C is referred to as "neutral". Strong bases may have a pH above 14, while very strong acids may have a pH below 14.
0.0520 M CH3COOH in 42.2 mL of moles is as follows:
2.194x103 mol CH3COOH = 0.0422L (0.0520mol / L)
that react with NaOH, resulting in:
NaOH + CH3COOH = CH3COO + Na+ + H2O
Thus, 1 mole of acetic acid and 1 mole of NaOH react.
As a result, 2.194x103 mol of NaOH are required to reach the equivalence point in volume:
To attain the equivalency point, 2.194x103 mol (1L / 0.0372mol) = 0.05899L 58.99mL of 0.0372 M NaOH
You will only have CH3COO at the equivalency point because it is in equilibrium with water, so:
H2O(l) + CH3COO(aq) CH3COOH(aq) + OH (aq)
A definition of equilibrium is:
Kb = 5.6x1010 = [OH] / [CH3COO] / [CH3COOH]
2.194x103mol of CH3COO has a molarity of (0.05899L + 0.0422L) = 0.02168M.
Therefore, equilibrium concentrations are:
[CH3COO]=0.02168M-X [CH3COOH]=X [OH]=X
5.6x1010 = [X] [X] / [0.02168M - X] converts to Kb.
1.214x1011 - 5.6x1010X = X2 X2 + 5.6x1010X - 1.214x1011 = 0 Finding the value of X:
False response; there are no negative concentrations. X: -3.48x106
As [OH] = X, [OH] = 3.484x106M, X is 3.484x106.
As 14 = pOH + pH pH = 8.54, pOH = -log [OH], or 5.46.
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really need help stuck on this not stirs what is correct
Answers
The aim of the oath was in order to discourage a revolution as shown in Option C.
What was the aim?King Louis XVI aimed to use Jacques-Louis David's painting of the Oath of the Tennis Court as propaganda to show his support for the National Assembly's new constitution and to present himself as a reform-minded monarch.
The painting depicts the deputies of the National Assembly taking an oath to not disband until they had drafted a new constitution for France, which was a significant moment in the French Revolution. The painting was commissioned by the king and was meant to demonstrate his willingness to work with the National Assembly and his commitment to reform.
However, the painting ended up having a more significant impact in promoting the revolutionary ideals of liberty, equality, and fraternity, and was seen as a symbol of the people's power over the monarchy.
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Peer-reviewed papers are considered trustworthy because they
A.Have more than one author incorrect answer
B.Prove their hypotheses incorrect answer
C.Have been checked by other scientists
D.are published frequently
Answers
a. what is the hybridization of the central atom in cse2?
Answers
The orbital hybridization of the central carbon atom in CSe2 is sp.
In chemical bonding, atomic orbitals may be combined to form appropriate hybrid orbitals suitable for bonding. The orbitals that combine during hybridization must be close enough in energy.
In the compound Cse2, carbon is the central atom bonded to two selenium atoms. The carbon atom in CSe2 is sp hybridized.
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g 50.0 l of nacl solution is added to 10.0 l of 2.7 m of koh.what is the final molarity or final molar concentration of thekoh solution? (answer: 0.45 m)
Answers
After being mixed with 50.0 L of NaCl solution, the KOH solution's final molarity is 0.45 M.
We can apply the principle of dilution to ascertain the ultimate molarity of the KOH solution. The dilution equation is:
M₁V₁ = M₂V₂
Where:
M1 is the solution's initial molarity (KOH).
V1 is the solution's starting volume (in KOH).
M2 is the solution's final molarity (KOH).
V2 is the solution's total volume (in KOH).
Given:
Initial KOH solution volume (V1) is 10.0 L.
KOH solution's initial molarity (M1) is 2.7 M.
After incorporating NaCl solution, the KOH solution's final volume (V2) equals 10.0 L plus 50.0 L, or 60.0 L.
These values are substituted in the dilution equation:
(2.7 M)(10.0 L) = (M₂)(60.0 L)
27.0 = 60M₂
Calculating M2:
M₂ = 27.0 / 60 = 0.45 M
Therefore, after adding 50.0 L of NaCl solution, the KOH solution's final molarity or molar concentration is 0.45 M.
It's vital to note that this estimate is based on the supposition that the quantities are additive and that NaCl and KOH do not react. Furthermore, no departures from ideal behaviour are taken into consideration in this calculation, which is predicated on perfect behaviour.
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The temperature of a gas is increased. Which statement best explains the effect that this has on the motion of gas
particles?
Answers
Answer:
The average kinetic energy increases, and the particles collide more frequently.
Explanation:
A certain type of stainless steel cookware has a layer of copper applied to the bottom to help it heat evenly. The copper transfers heat to the pan by
Answers
Answer:
Conduction
Explanation:
Conduction seems to be the mechanism whereby heat energy is transferred from adjacent molecules by interactions. In solids and liquids, where even the objects are near to each other, conduction happens more easily than in liquids, where even the molecules are farther separated.
Ocean and wind currents are both caused by
A. uneven specific heat
B. the jet stream
C. the gulf stream
D. uneven insolation
Answers
Ocean and wind currents are both caused by
uneven specific heatSo,option A is correct one.
How Ocean and wind currents are both caused?The solar radiation received by the earth more at equator as compare to poles.The uneven distribution of heat creates pressure difference,which leads to cause the movement of air or wind on the surface of ocean.What is wind current?The air that moves in a river like a flow in a particular direction is called wind current.
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Explain how nitrogen oxides released into the atmosphere can lead to the formation of a secondary pollutant that can lead to acid deposition.
Answers
Nitrogen oxides react with oxygen and rainwater to form nitric acid a secondary pollutant which dissolves in water droplets forming acid rain.
What is a secondary pollutant?A secondary pollutant is a pollutant which results from changes that occur in an initial pollutant known as the primary pollutants.
Pollutants pose dangers to plant and animals found in a given environment.
The primary pollutant, nitrogen oxides, which are released into the atmosphere from industrial and vehicular smoke can be changed into a secondary pollutant.
Nitrogen oxides react with oxygen and rain to form nitric acid a secondary pollutant.
Nitric acid (HNO3) then enter the environment through the ground as droplets in rain forming acid rain.
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Explain the energy transformation that occurs when food is digested. (4 points)
a
Chemical energy transforms into mechanical energy.
b
Electrical energy transforms into mechanical energy.
с
Mechanical energy transforms into chemical energy.
d
Thermal energy transforms into electrical energy.
Answers
Answer: A. Chemical energy transforms into mechanical energy.
Proof of validity is shown below.
what would happen if we lost our planets core on earth blew up, would we all die or will we lose gravity or suficate, pls help. :I
Answers
Answer: if we lost our core it would be an entire fallout like fallout 76 we would have no way to protect ourselves from the radiation of space except for a select few that actually own astronaut suits tho we would not turn into monsters, sadly :( I wanna be a ghoul
An acceptable first-line treatment for peptic ulcer disease with positive H. pylori test is:
1. Histamine2 receptor antagonists for 4 to 8 weeks
2. Proton pump inhibitor bid for 12 weeks until healing is complete
3. Proton pump inhibitor bid plus clarithromycin plus amoxicillin for 14 days
4. Proton pump inhibitor bid and levofloxacin for 14 days
Answers
The acceptable first-line treatment for peptic ulcer disease with a positive H. pylori test is a proton pump inhibitor (PPI) in combination with clarithromycin and amoxicillin for 14 days. This treatment regimen has proven to be effective in eradicating H. pylori infection and promoting ulcer healing.
Peptic ulcer disease is commonly associated with Helicobacter pylori (H. pylori) infection, and eradicating the bacteria is crucial for effective treatment. Among the given options, the most appropriate first-line treatment is the combination of a proton pump inhibitor (PPI) with clarithromycin and amoxicillin for 14 days (Option 3). PPIs reduce gastric acid secretion, providing an environment conducive to ulcer healing and reducing symptoms. Clarithromycin and amoxicillin are antibiotics that target and eliminate H. pylori, eradicating the underlying cause of the ulcer. This combination therapy has shown high efficacy in achieving H. pylori eradication and promoting ulcer healing. Option 1, histamine2 receptor antagonists (H2 blockers) for 4 to 8 weeks, was previously used as a first-line treatment, but it has been largely replaced by PPIs due to their superior efficacy. H2 blockers only reduce acid secretion temporarily and do not directly target H. pylori, making them less effective in eradicating the infection. Option 2, a PPI bid for 12 weeks until healing is complete, may be appropriate for patients with uncomplicated ulcers but without H. pylori infection. However, in the case of a positive H. pylori test, combination therapy with antibiotics is necessary for eradication. Option 4, a PPI bid and levofloxacin for 14 days, is an alternative regimen in cases where clarithromycin resistance is known or suspected. However, since the question specifies a positive H. pylori test without any mention of clarithromycin resistance, the combination of PPI, clarithromycin, and amoxicillin remains the preferred first-line treatment. In conclusion, the acceptable first-line treatment for peptic ulcer disease with a positive H. pylori test is a 14-day regimen of a proton pump inhibitor (PPI), clarithromycin, and amoxicillin. This combination therapy effectively eradicates H. pylori and promotes ulcer healing, providing optimal patient outcomes.
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electron configuration
Answers
Answer:
1
Explanation:
Maximum value of azimuthal quantum number (l) = (n-1)
Value of azimuthal quantum number can never be equal to principal quantum number
What’s science in science
Answers
Answer:
Science is the pursuit and application of knowledge and understanding of the natural and social world following a systematic methodology based on evidence. Scientific methodology includes the following: Objective observation: Measurement and data (possibly although not necessarily using mathematics as a tool)
Explanation:
Answer:
Modern science is typically divided into three major branches that consist of the natural sciences (e.g., biology, chemistry, and physics), which study nature in the broadest sense; the social sciences (e.g., economics, psychology, and sociology), which study individuals and societies; and the formal sciences
ANSWER THESE 5 MULTPLE CHOICE QUESTIONS!!!
I'LL GIVE 30 POINTS AND A BRAINIEST:)
Answers
Answer:
1. B
2.C
3.D
4.Sorry don't this one :(
5.A
Explanation:
please give me at least 20 points ❤
How many milliliters of 4.24 M KCl must be diluted to make 825 milliliters of a 0.705 M KCl solution?
Answers
Answer:
137.18mL
Explanations:
To get the required volume, we will use the dilution formula expressed as:
\(C_1V_1=C_2V_2_{}\)C1 and C2 are the concentration of the solution
V1 and V2 are the corresponding volumes
Given the following parameters:
\(\begin{gathered} C_1=4.24M \\ C_2=0.705M \\ V_2=825mL \\ V_1=\text{?} \end{gathered}\)Substitute the given parameters into the formula:
\(\begin{gathered} V_1=\frac{C_2V_2}{C_1} \\ V_1=\frac{0.705\cancel{M}\times825mL}{4.24\cancel{M}} \\ V_1=\frac{581.625mL}{4.24} \\ V_1=137.18mL \end{gathered}\)Hence the required volume of KCL that must be diluted to make 825 milliliters of a 0.705 M KCl solution is 137.18mL
A 1200 kg car is traveling at a velocity of 9. 0 m/s North. The driver brakes and the car decelerates to 7. 0 m/s North. How much momentum does the car lose?
Answers
The car loses 10,800 kg·m/s of momentum during the deceleration.
Momentum is defined as the product of an object's mass and its velocity.
The initial momentum of the car is calculated by multiplying its mass (1200 kg) by its initial velocity (9.0 m/s), resulting in 10,800 kg·m/s.
During the deceleration, the car's velocity decreases to 7.0 m/s. To find the final momentum, we multiply the mass (1200 kg) by the final velocity (7.0 m/s), giving us a value of 8,400 kg·m/s.
To calculate the change in momentum, we subtract the final momentum from the initial momentum: 10,800 kg·m/s - 8,400 kg·m/s = 2,400 kg·m/s. Therefore, the car loses 2,400 kg·m/s of momentum during the deceleration.
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Please help!
If pressure is constant, the combined gas law reduces to _____ law.
If volume is held constant, the combined gas law reduces to _____ law.
Answers
If pressure is held constant, the combined gas law would become \(v_1/t_1 = v_2/t_2\)
If the volume is held constant, the combined gas law would become \(p_1/t_1 = p_2/t_2\)
What is combined gas law?The combined gas law is a law that relates Boyle's law, Charle's law, and Gay-Lussac's law together in a single equation. The equation is expressed below:
\(p_1v_1/t_1 = p_2v_2/t_2\)
Where \(p_1\) is the initial pressure of gases, \(v_1\) is the initial volume of gases, \(t_1\) is the initial temperature of gases, \(p_2\) is the final pressure, \(v_2\) is the final volume, and \(t_1\) is the final temperature.
If pressure is held constant, it means \(p_1 = p_2\), the equation becomes:
\(v_1/t_1 = v_2/t_2\)
If the volume is held constant, it means \(v_1 = v_2\), the equation becomes"
\(p_1/t_1 = p_2/t_2\)
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A solution has [OH-]= 5.2 Ã 10-4 M. ThepH of this solution isa. 3.28b. 1.92 Ã 10-11c. 5.36d. 10.72e. none of these
Answers
The pH of the solution that has [OH⁻]= 5.2 x 10⁻⁴ M is (d) 10.72.
To find the pH of the solution with [OH⁻] = 5.2 x 10⁻⁴ M, we need to first find the [H⁺] concentration using the relationship between [H⁺] and [OH⁻], which is given by the ion product of water (Kw):
Kw = [H⁺] x [OH⁻]
Kw for water is 1.0 x 10⁻¹⁴ at 25°C.
Now, calculate [H⁺]:
[H⁺] = Kw / [OH⁻] = (1.0 x 10⁻¹⁴) / (5.2 x 10⁻⁴) = 1.92 x 10⁻¹¹ M
Now, to find the pH, we use the pH formula:
pH = -log[H⁺]
pH = -log(1.92 x 10⁻¹¹) ≈ 10.72
So, the pH of the solution is approximately 10.72, which corresponds to answer choice d.
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Answer:
Type your answer here.
(Score for Question 7:
of 3 points)
7. Describe what happened as the ice melted. Where do you think the energy goes when it is not raising the
temperature?
I
-
Science | Graded Assignment | Lab Report Phase
Answer:
Type your answer here.
Answers
The energy is being used to change the state of the ice rather than changing its temperature.
What is the phase change of ice?When ice melts, it undergoes a phase change from a solid to a liquid state. During this process, the temperature of the ice remains constant at the melting point of water.
This is because the energy being added to the ice is being used to break the intermolecular bonds between the water molecules in the ice rather than increasing the kinetic energy or temperature of the molecules.
The energy that is not being used to raise the temperature of the ice during the melting process is known as the latent heat of fusion. This energy is used to overcome the forces of attraction between the water molecules in the solid ice and break them apart.
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