At an altitude of 18,000 feet, where the atmospheric pressure is 0.5 atm, the pressure is 7.5 pounds per square inch.
At sea level, what is the calculation?One square inch of any surface has 15 pounds of air sitting on top of it at sea level. That same square inch is only under 7.5 pounds per square inch of pressure at 18,000 feet.
The atmospheric pressure rises with increasing altitude. Contrary to popular belief, the graph shows that pressure decreases as altitude rises (moving to the right on the graph).
At sea level, the atmospheric pressure is 14 pounds per square inch. If we assume that the altitude is zero, we can see that the pressure is equal to 14 pounds per square inch. The atmospheric pressure rises as the altitude gets closer to sea level.
We observe that the pressure value rises as the altitude gets closer to sea level. As the altitude rises, the atmospheric pressure approaches 14 pounds per square foot. Only when the elevation is 0 miles above sea level does the pressure equal 14 pounds per square inch.
The pressure will therefore be 7.5 pounds per square inch if the air pressure in the atmosphere measures at 18,000 feet or 0.5 atm.
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to produce 4.00 L of a 250. mM solution of sodium hydroxide, how many grams of NaOH must bee dissolved
You may determine the number of moles of solution you need by multiplying the volume in liters (4.00L) by the solution's molar concentration (0.250M), and then by the mass of sodium hydroxide (39.99 g/mol) in molar form. 1L = 39.99g × 4.00L x 0.250 M x 39.99g
The number sodium hydroxide of moles of solute dissolved in one liter of a solution is known as its molarity.
where,
250 mM Molarity =
moles of solute = n
= liquid volume in milliliters = 4L = 4000 ml
Now, using the molarity formula to combine all the values provided, we obtain
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I need help
What causes winter in the Northern Hemisphere. Include a labelled diagram.
Answer:
It's Simple earth just moves noob
How many molecules are in 10.0 g of aspartame?
There are 0.034 x 1019 = 10¹⁹ moles of molecules in 10 g of aspartame.
Avogadro's constant, 6.022 1023, and the molar mass of the material are used to calculate the number of molecules in a given mass of the substance. Aspartame's molecular formula is C14H18N2O5.
Aspartame has a molecular mass of 294 (12 * 14 + 1 * 18 + 14 * 2) + 16 * 5)
Let's convert the 10 mg mass supplied to aspartame moles as follows:
Amount of moles =
= 0.034 × 10 ⁻⁵ mole
We may convert this number to molecules using Avogadro's constant as follows:
= 0.034 × 10 ⁻⁵ (6.022 × 10²³)
= 0.034 × 10¹⁹
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The transfer of energy from one region of the atmosphere to another is of great importance in meteorology for it affects the weather. Calculate the heat needed to be supplied to a parcel of air containing 1. 00 mol air molecules to maintain its temperature at 300 K when it expands reversibly and isothermally from 22 dm3 to 30. 0 dm3 as it ascends
Energy transfer from one region of the atmosphere to another is critical in meteorology because it affects the weather.
What is Meteorology?
Meteorology is the science of studying the atmosphere and its phenomena such as weather, climate, and air pollution. It is a branch of the atmospheric sciences and studies the physical processes that make up the atmosphere and how the atmosphere affects the Earth and its inhabitants.
The amount of heat needed to be supplied to the parcel is given by the equation:
Q = nRT∆V
Where n is the number of moles of air, R is the ideal gas constant, T is the temperature in Kelvin and ∆V is the change in volume.
Therefore, the amount of heat needed to be supplied to the parcel is given by:
Q = (1.00 mol)(8.314 J/molK)(300 K)(30.0 dm3 - 22.0 dm3)
Q = 4, 573.2 J.
This is important because it demonstrates the amount of energy that must be supplied in order to keep the parcel of air at a constant temperature as it expands. Without this energy, the temperature of the parcel would decrease as it expands, resulting in a change in its weather patterns.
Hence, the amount of heat needed is: Q = 4, 573.2 J.
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What does the sun shape indicate?
The Sun is a close second in terms of object radii. It would be so spherical if shrunk to the size of a beach ball that the distance between its widest and narrowest diameters would be significantly smaller than the width of a human hair.
What does the sun symbolize?Our world is greatly influenced by the sun, which controls the weather, ocean currents, seasons, and climate as well as enabling plant life through photosynthesis. Life on Earth would not live without the heat and light provided by the sun.
Because they developed and collapsed under the force of their own gravity, the Sun and the majority of other big objects in space, including stars, planets, and large moons, are spherical. When our Solar System first formed, it was a massive, whirling cloud of gas and dust that gradually shrank due to gravity.
Thus, The Sun is a close second in terms of object radii.
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Has 13 protons and 14 neutrons what is its mass number?
An atom that has 13 protons and 14 neutrons will have mass number 27.
Rutherford demonstrated that an atom's nucleus, which is made up of protons and neutrons, contains the vast bulk of the atom's mass. The total number of protons and neutrons in an atom is referred to as the mass number. The number of protons(atomic number) and neutrons and their sum can be used to compute it.
We know that,
Mass number = Number of protons + Number of neutrons
= 13 + 14 = 27.
The mass number is 27.
Therefore an atom that have 13 protons and 14 neutrons will have mass number 27.
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Using your prior knowledge of reaction stoichiometry, what is the final percentage of each reactant remaining if each reaction went to completion? show work and reasoning to justify your answer
i) No reactant will be left as all of them have been converted to product after completion of this reaction.
ii) Final percentage of each reactant remaining if each reaction went to completion is about 99.9%.
What is molar ratio?The difference between the moles (or molecules) of reactants consumed and the moles (or molecules) of products produced in a chemical reaction is known as the molar ratio.
i) Now given the molar ratio of CV : NaOH is 1:1 . That means Equal moles of CV and NaOH are present in the solution. That means all the CV and NaOH molecules will react to form equal number of products.
So in this case, no reactant will be left as all of them have been converted to product after completion of reaction.
ii) In this case, the given NaOH : CV = 1000 : 1. That means per 1000 moles of NaOH, we have only 1 mole of CV. Now since 1 mole of CV can react with only 1 mole of NaOH, then after the reaction of this 1 mole CV, there will be no CV left . And only 999 NaOH molecules will be left in the solution
So here % CV left = 0%
% of NaOH left = 999 / 1000 × 100
% of NaOH left = 99.9 %
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Complete question is attached below
For the homogeneous solution consisting of KCl and H2O, indicate the type of forces that are involved. Check all that apply. View Available Hint(s) dipole-dipole forces ion-dipole forces dispersion forces hydrogen bonding Submit Previous Answers X Incorrect; Try Again; 9 attempts remaining
For the homogeneous solution consisting of KCl and H₂O, the type of forces that are involved is the dipole-dipole forces, the ion-dipole forces dispersion forces, the hydrogen bonding.
In the homogeneous solution if the two compounds are KCl and H₂O, they both polar and the forces involved are dipole - dipole forces and the dispersion forces. the forces present in between the water molecules is the hydrogen bonding. the forces in between the K⁺ and the Cl⁻ present is the ion - dipole forces,
Thus the all the four forces present in the homogeneous solution of the KCl and H₂O that is the dipole-dipole forces, the ion-dipole forces, the dispersion forces, and the hydrogen bonding.
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Chlorine dioxide, ClO2, si a reddish-yellow gas that is soluble in water. In basic solution it gives ClO3- and ClO2- ions. 2ClO2(aq) + 2OH-(aq) ?
ClO3-(aq) + ClO2- (aq) + H2O. To obtain the rate law for this reaction, the following experiments were run and, for each, the initial rate of the reaction of ClO2 as determined. Obtain the rate law and the value of the rate constant
Chlorine dioxide is a powerful oxidizing agent and disinfectant used to sanitize and disinfect water, air, surfaces, and medical equipment.
What is Chlorine?
Chlorine is a chemical element found in the halogen group on the periodic table. It has the atomic symbol Cl, and its atomic number is 17. Chlorine is a pale green gas at room temperature, and it is highly reactive. Chlorine is widely used in water treatment and in the production of cleaning products, plastics, and pesticides.
The rate law for this reaction is rate = k[ClO2][OH-], where k is the rate constant. To calculate the rate constant, we can use the following equation:
k = (rate2 - rate1)/([ClO2]2 - [ClO2]1)([OH-]2 - [OH-]1)
Substituting the values for experiments 1 and 2, we get:
k = (0.00276 - 0.0248)/((0.020 - 0.060)(0.030 - 0.030)) = -0.142
The value of the rate constant is k = -0.142 mol/((L s)mol2).
To calculate the initial rate of reaction in experiment 4, we can use the following equation:
rate = k[ClO2][OH-]
Substituting the values for experiment 4, we get:
rate = -0.142(0.040)(0.060) = -0.0043 (mol/((L s))
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A compound with a molecular mass of 56.104 grams is found to be 86% carbon. The rest of the compound is hydrogen. Find its molecular formula. Group of answer choices C3H6 C4H8 C2H4 C6H10
The molecular formula for this compound is C4H8 that can be calculated from its empirical formula.
The empirical formula of a chemical compound is the simplest whole number ratio of atoms present in a compound. The compound is made up of only carbon and hydrogen atoms thus it is known as hydrocarbon. The percentage of carbon is 86%, therefore the percentage of hydrogen is 14%.
The molecular mass of the compound is given i.e., 56.104 grams.
Moles of C= 86 g * 1 mol/12 g =7 moles
Moles of H=14 g* 1 mol/1 g= 14 moles
Thus, the mole ratio of C:H can be given as:
Moles of C/ Moles of H= 7/14=1/2
Thus, the empirical formula is CH2 while its molecular formula is C4H8.
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9.0 mol al reacts with 6.0 mol O2 to form Al2O3. According to the reaction below: 4Al+3O2=2Al2O3. How many moles of Al2O3 form from 6.0 mol al?
The number of moles of the aluminum oxide that is produced is 4.5 moles.
What is the stoichiometry?We have to look at the stoichiometry of the reaction. In this case, we can see that there is a combination between the aluminum and the oxygen and then we have a product as have been shown in the equation that we have in the question.
From the equation, we know that;
4 moles of oxygen produces 2 moles of aluminum oxide
9 moles of oxygen produces x moles of aluminum oxide
x = 9 * 2/4
x = 4.5 moles
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Answer: its actually 4
Explanation:
What is the function of a climograph?
Answer:
A climograph is a graphical representation of the climate of a particular location over a period of time. It typically shows the average temperature and precipitation for a specific location over the course of a year, with the temperature plotted on the y-axis and the months of the year plotted on the x-axis.
The primary function of a climograph is to provide a visual representation of the climate of a particular location, which can be useful for understanding the weather patterns and temperature ranges that are typical for that location. Climographs can also be useful for comparing the climate of different locations, as they provide a convenient way to see how temperature and precipitation patterns differ from one place to another.
Calculate the percentage composition (by mass) of oxygen in K2SO4.
36.72 %
18.35 %
9.18 %
23.66 %
76.34 %
Answer:
it's option no A as described in the image
Are used for energy storage to build structures and as signal molecules to help cells communicate with each other
Yes, carbohydrates are used for energy storage to build structures, and as signal molecules to help cells communicate with each other.
Carbohydrates and functionsCarbohydrates are molecules that consist of carbon, hydrogen, and oxygen atoms and can be broken down by the body to provide energy. They are used to build the structural components of cells, such as the cell walls and membranes, and are also used as signal molecules between cells. As signal molecules, they can help cells communicate with each other and respond to changes in the environment.
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A food worker needs to
measure the temperature of
cold-held potato salad.
Where should she check the
temperature?
If a food service employee has to check the temperature of cold potato salad, she should do so at multiple places throughout the salad
If the dish is maintained between 40 and 140 degrees Fahrenheit, potato salad can be consumed around two hours after cooking. A nice approach to keep salad fresh for a long time is to refrigerate it at 40 F. Before reaching 140 F, the hot salad can be reheated.
Addition than potatoes, the salad ingredients may contain other ingredients with varying rates of cooling. Therefore, it is necessary to take temperature readings of the potato salad at various locations.
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The complete question is-
A food worker needs to measure the temperature of cold-held potato salad where should she check the temperature
A. On the surface of the salad
B. Along the side of the salad dish
C. In multiple places throughout the salad
D. On the temperature gauge of the holding equipment
Ex: Mg + 2HCl—-> MgCl₂ + H₂ If 4.48L of H₂ gas at STP is
produced in 40 sec, what is the reaction rate in mol/sec?
Answer:
The reaction rate in mol/sec is 0.005.
Explanation:
To determine the reaction rate in mol/sec, you need to first determine the number of moles of H₂ gas produced in the reaction. The volume of a gas at STP (standard temperature and pressure) is directly proportional to the number of moles of the gas, so you can use the volume of H₂ gas produced to calculate the number of moles.
At STP, 1 mole of a gas occupies a volume of 22.4 L. Therefore, the number of moles of H₂ gas produced in the reaction can be calculated as follows:
moles H₂ = 4.48 L / 22.4 L/mol = 0.2 mol
To determine the reaction rate in mol/sec, you need to divide the number of moles of H₂ gas produced by the time it took for the reaction to occur:
reaction rate (mol/sec) = 0.2 mol / 40 sec = 0.005 mol/sec
So, the reaction rate in mol/sec is 0.005.
Iron objects such as storage tanks and underground pipelines can be protected from corrosion by connecting them through a wire to a piece of : Ag
Pb
Sn
Mg
Cu
Iron objects such as storage tanks and underground pipelines can be protected from corrosion by connecting them through a wire to a piece of Mg.
General corrosion happens when the majority or even all atoms on such a metal surface become oxidized, causing the surface to corrode completely. The majority of metals were easily oxidised, which means they frequently lose oxygen electrons (among other elements) in the air either in water. Oxygen joins with the metal to produce an oxide as it becomes reduced (gains electrons).
A refined metal usually transformed naturally by corrosion into a safer stable chemical form, including its oxide, hydroxide, and sulphide. By reacting chemically and/or electrochemically with their surroundings, materials slowly degrade. Additionally, it gradually eliminates the element using chemical processes.
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A second row element has a large jump between its third and fourth ionization energies. What is the element
Be is the second element with two valence elements When a core electron is eliminated, the energy of ionization increases. From an element's electrical configuration, it is simple to see a significant change in ionization energy.
Electronically, beryllium is configured as 1s2 2s2. The outermost shell of beryllium has two valence electrons, hence the data on ionization energy will show a sharp rise or leap from the second to the third ionization energy due to the elimination of a core electron. Nitrogen has the following electrical configuration: 1s2 2s2 2p3. The outermost shell of nitrogen has five valence electrons, thus when one of them is removed, the ionization energy data for nitrogen will show a sharp rise or leap from the fifth to sixth ionization energy.
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Give the orbital configuration of the following elements using the s, p, d, f type representation. (Answer format is: 1se2
The orbital configuration of following elements is as follows: i) helium- 1 s² ii)nitrogen- 1 s² 2 s² 2 p³ iii)silicon-1 s² 2 s² 2 p⁶ 3 s² 3 p²
What are elements?It is defined as a substance which cannot be broken down further into any other substance. Each element is made up of its own type of atom. Due to this reason all elements are different from one another.
Elements can be classified as metals and non-metals. Metals are shiny and conduct electricity and are all solids at room temperature except mercury. Non-metals do not conduct electricity and are mostly gases at room temperature except carbon and sulfur.
The number of protons in the nucleus is the defining property of an element and is related to the atomic number. All atoms with same atomic number are atoms of same element.
Here,
The orbital configuration of following elements is as follows: i) helium- 1 s² ii)nitrogen- 1 s² 2 s² 2 p³ iii)silicon-1 s² 2 s² 2 p⁶ 3 s² 3 p²
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How many moles in 28 grams of UO22- ?
The amount, in moles in 28 grams of [tex]UO_2[/tex] would be 0.1037 mol.
Moles determinationThe mole of a substance is the ratio of the mass of the substance and the molar mass of the substance. This can be mathematically expressed as:
Mole = mass/molar mass
Molar mass of [tex]UO_2[/tex] = 238 + (16x2) = 270 g/mol
Thus, the number of moles in 28 grams of [tex]UO_2[/tex] would be:
Mole = 28/270 = 0.1037 mol
In other words, the number of moles in 28 grams of [tex]UO_2[/tex] would be 0.1037 mol.
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How many moles in 28 grams of UO2?
PLS HELP ME ON 4 CHEMISTRY ASAP
The percent composition of cesium weighs 100 g in a sample with total mass of 400 g is 25 %.
What is mass percent?The mass percent of an element in a compound is the contribution from the element to the total mass of the compound. It is the ratio of the mass fraction of the element to the total mass multiplied by 100.
Mass percent is a common term used to express the concentration of an ion or element in a mixture.
Given that total mass of the compound = 400 g
mass of cesium in the compound = 100 g.
Mass percent of cesium = mass of Cs/total mass
mass % = 100 /400 × 100 = 25%
Therefore, the mass % of Cs in the compound is 25%.
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PLEASE HELP ASAP!!!!
A law summarizes a set of observations about an experiment.
What exactly does the word law mean?Chemical law: Most of the properties and the atomic structure of the elements vary periodically when the elements are arranged in the order of their atomic numbers.
A sound explanation for observations is referred to as a theory. A summary of the relationship between variables constitutes a scientific law. A controlled method of testing a hypothesis is through an experiment.
The fundamental chemistry laws in chemistry are considered to be the following three: the mass conservation principle. the principle of proportional equality. A multiple proportions law.
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What is the priority nursing intervention for a patient who experienced a chemical burn injury?
Respiratory and fluid status are primary nursing interventions for patients with chemical burns.
When treating, make sure that the causative agent is completely removed. Remove contaminated clothing and jewelry and use the shower if necessary to wash off the chemicals for at least 20 minutes. Protect your eyes from chemical contamination. Cover the burn with a clean bandage.
During the first few days after a burn, check your peripheral pulse frequently for restricted blood flow. Carefully monitor hourly fluid intake and urine output, as well as blood pressure and heart rate. Any changes should be reported immediately to the burn surgeon.
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Iodine Monochloride reacts reversibly with Chlorine to form Iodine Trichloride, What will be the color of the equilibrium mixture
Answer:
Yellow
Explanation:
The color of the equilibrium mixture of Iodine Monochloride and Chlorine is yellow. When the mixture is heated, it becomes darker brown in color.
10. A body is found at 2:00 pm on New Year's Eve. The temperature of the liver registers 75. 5° F. What is the approximate TOD of the victim?
The estimated time of death is approximately 10:30 pm the night before.
Estimating the time of death (TOD) can be a complex process, and the methods used will depend on the specific circumstances of the case. Some of the factors that may be taken into consideration include:
The stage of decomposition of the body: As a body decomposes, it will go through several distinct stages, each of which can provide information about the TOD.The temperature of the body: As a body cools after death, the temperature will drop at a predictable rate. By measuring the temperature of the body at different points in time, it may be possible to estimate the TOD.The body's position: The position of the body can provide clues about the time that has passed since death. For example, if a body is found lying on its back, it may indicate that it has been dead for a longer period of time than if it is found on its stomach.The presence of insects or animals: Certain insects and animals are attracted to dead bodies at different stages of decomposition. By examining the presence of these insects or animals, it may be possible to estimate the TOD.Scene examination: The scene examination and any possible evidence collected can give a rough estimate of the time of death.It is important to note that estimating the TOD is not an exact science and there are often significant margins of error. A professional forensic examination is typically needed to determine the TOD.
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A 5.05 g sample of quartz (SiO 2) contains 2.36 g of silicon. What are the percentages of silicon and oxygen in quartz
In quartz, silicon has a mass percent of 46.7% while oxygen has a mass percent of 53.3%.
Given the total mass of a sample of quartz (SiO2) (m1) = 5.05g
Mass of silicon (m2) = 2.36g
The percent composition of an element in a chemical compound is referred to as mass percent. Mass percent may be expressed as follows:
mass percent = mass of element/mass of sample x 100
The percent mass of silicon (p1) = 2.36/5.05 x100 = 46.7%
The substance was made of silicon and oxygen.
Thus, 100% Quartz =%Silicon +%Oxygen can be used to express the mass percentage of quartz.
100% Quartz = 46.7% + % Oxygen
% Oxygen = 53.3%
Hence the percentages of silicon and oxygen in quartz are 46.7% and 53.3%.
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what are the two quantities in this module for which we will develop unit factors to do dimensional analysis with chemical substances?
The two portions on this module for which we can broaden unit elements to do dimensional analysis with chemical materials are volume and mass.
volume is a degree of the quantity of three-dimensional space occupied by using an object or substance. it's miles regularly measured in liters, cubic centimeters, or cubic meters. volume is used to measure the potential of a field, the dimensions of an object, or the quantity of liquid or gas in a given space. it's also used to determine the mass of an item, because the density (mass in line with unit quantity) is often acknowledged.
the 2 portions of volume and mass are critical for doing dimensional analysis with chemical substances because they help to measure the amount of a substance in distinct gadgets. extent is vital for measuring the quantity of liquid materials, and mass is critical for measuring the quantity of strong substances. each of these portions are vital for accurate and specific measurements of chemical substances, making them crucial for dimensional analysis.
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What are the two factors that affect the arrangement of particles in a substance?
The two factors that affect the arrangement of particles in a substance are kinetic energies and intermolecular forces.
In chemistry, all the substances are composed of tiny particles which are in constant motion.
The substance which is made up of atoms, ions or molecules, all the particles possess kinetic energy and keep moving in all direction. On the other hand, intermolecular forces are also present in a substance which keeps the particles together within their boundaries and doesn't let them go far away. In this way substances maintain their shape, arrangement and properties.
In sum, two factors play a crucial role in maintaining the properties of a substance: Kinetic energy and intermolecular forces.
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like tobacco smoke, the aerosol given off by an e-cigarette can contain dangerous chemicals.
The title "e-cigarettes," sometimes known as "electronic nicotine delivery systems" (ENDS) and infrequently "electronic non-nicotine delivery systems," refers to a wide range of distinct products (ENNDS).
By heating the liquid, these systems can produce aerosols that the user inhales. These so-called e-liquids typically contain additives, flavours, and chemicals that can be harmful to people's health, alongside nicotine (but no tobacco), which could or may not been present.
The deadly mixture of 7,000 hazardous substances in cigarette smoke is generally lower prevalent in e-cigarette aerosol than it is. 3 Aerosol produced e-cigarettes is not risk-free, though.
It may include toxic or carcinogenic drugs include tobacco, contaminants like lead, volatile compounds, and melanoma agents.
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5. Calculate the heat energy required, in joules, to melt 5.00 x 10² grams of ice at 0.0°C.
Here is the Conclusion 240. Heat energy affects a substance’s intermolecular forces as the substance changes between states.
How to get the State changes?Heat energy increases during the following state changes
Solid - (melting)
Liquid -gas (evaporation)
Solid- gas (sublimation)
Heat energy decreases during the following state changes
Gas- liquid (condensation)
Liquid → solid (freezing)
Gas –solid (deposition)
An intermolecular force (IMF) (or secondary force) is the force that mediates the interaction of molecules, including electromagnetic forces of attraction or repulsion that act between atoms and other types of nearby particles, such as atoms or ions.
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The heat energy required, in joules, to melt 5.00 x 10² grams of ice at 0.0°C. 2016.6 J.
How does heat energy become created?When the temperature rises, molecules and atoms move faster and collide, creating heat generated (also known as heat energy). Thermal energy is the heat that results from heated substance's temperatures.
Calculation :The following phrase may be used to determine the change in heat energy in a process like melting.
S = H * m / T
where:
S = entropy [kJ]
H = fusion heat = 3.36*10¹ [J/kg]
m = mass = 0.02 [kg]
T = temperature in kelvin = 273 [K]
S = 0.02 * 5.00 * 10² / (273 + 0)
S = 2016.6 J
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The complete question is -
Calculate the heat energy of 5.00 * 10² g of ice when it melts at 0.0°C. The heat of fusion of ice is 3.36 x 10'J/kg.