From the calculations, the heat of fusion of the substance is 0.73 kJ
What is is the heat of freezing?The heat of freezing is the energy released when the substance is converted from liquid to solid.
Now we know that the molar mass of the substance is 82.9 g/mol hence the number of moles of the substance is; 13.3 g /82.9 g/mol = 0.16 moles
Now the heat of fusion shall be;
H = 4.60 kj/mol * 0.16 moles
H = 0.73 kJ
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A company is announcing the construction of a new skyscraper to the public. Which model will give the best idea of how the new building will change the city skyline?
A.
a drawing showing the interior of the building
B.
a full scale, three-dimensional model of the building
C.
a rough sketch of the building's shape
D.
a drawing showing both the new and old buildings
Answer:
D.
Explanation:
This is because this option would allow one to see the sorroundings of the new building. The others only give perpectives on what the new building looks like, isolated from its sorroundings.
Determine the number of neutrons in 20 grams Uranium-238
Answer:
146 neutrons
Explanation:
The atomic number of uranium (see periodic table) is 92, and the mass number of the isotope is given as 238. Therefore, it has 92 protons, 92 electrons, and 238 — 92 : 146 neutrons.
What is the formula for the ether functional group?
The formula for the functional group of ether is R–O–R– group. Details about functional group can be found below.
What is a functional group?A functional group is a specific grouping of elements that is characteristic of a class of compounds, and determines the chemical properties of that class.
Ether is any of a class of organic compounds containing an oxygen atom bonded to two hydrocarbon groups.
Therefore, the formula for the functional group of ether is R–O–R– group.
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The vapour pressure of water 12.3kPa at 300K. Calculate the vapour pressure of 1 molal solution of a non-volatile solute in it.
Answer:
ywhehehehehdgdudcdudcd uy dshdcvv
Explanation:
bdbdkzkzjzdkdkzdvdisisksjskakskskzbx vxydcdudschahahbshshs
How many grams are in 4 moles of H2O?
Answer:
There are 72grams in 4 moles of H20
What is the speed of light written in standard numerical form?
What happens when a solid is dissolved into a liquid?
O Solid particles float toward the surface layer of liquid particles.
O Solid particles sink down toward the bottom layer of liquid particles.
O Solid particles become evenly dispersed among liquid particles.
O Solid particles become suspended in the middle of liquid particles.
When a solid dissolves in a liquid to form a solution, solid particles become evenly dispersed among liquid particles.
What are solutions?Solutions are formed when a solute particle dissolves in another substance known as a solvent.
Usually, solutions are formed when solids dissolve in liquids.
The solid is the solute while the liquid is the solvent.
When a solid dissolves in a liquid, solid particles become evenly dispersed among liquid particles.
Therefore, solutions are formed when solute particles dissolve in solvents.
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Answer:
c
Explanation:
chem ed 2022
Select all that apply.
When the products of a reaction have a higher enthalpy than the reactants:
The change in enthalpy is positive.
The reaction is exothermic.
The reaction is endothermic.
The change in enthalpy is negative.
When the enthalpy of products is higher than that of reactants, such a reaction is said to be endothermic.
EnthalpyThe enthalpy of a system refers to the heat content of the system.
When the enthalpy of reactants is higher than that of products in a reaction, such a reaction is said to be exothermic. On the other hand, if the enthalpy of products is higher than that of the reactants, it is endothermic.
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What is the volume of a gas if 0.182 moles of the gas is at 1.99 atm and 83.4oC?
Answer:
2,67 L
Explanation:
How can we tell the distance sediments traveled due to erosion ?
Answer:
more rounded the grains are the more they have been moved around
Explanation:
Generally – the more rounded the grains are the more they have been moved around (i.e. the longer the length of time or distance they have moved). Angular grains cannot have travelled far
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The begining of this chemical equation represents the starting materials for a chemical reaction
which compound us likely produced by the chemical reaction H20+ SO3
Describe the difference between the rate of diffusion seen for sodium and urea.
does lotus have shiny or dull body surface
Yes, it is true that the plant known as Lotus has a shiny surface.
What is Lotus?
This is referred to a type of plant which grows in mud and has micron- and nano-scale features.
It has a wax like surface which prevent dirt and water adhesion thereby making its surface to also be shiny and attracts insects for pollination in this regard.
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Which statements describe proper use of a filter funnel?
Answer:
Fold the filter paper in fourths before placing it in the funnel and pour all the liquid through the funnel.
Explain how each property affects the energy in a wave:
Amplitude:
Wave speed:
Wavelength:
Frequency:
Answer:Amplitude:the maximum displacement or distance moved by a point on a vibrating body or wave measured from its equilibrium position. It is equal to one-half the length of the vibration path.Wave speed:Wave speed is the distance a wave travels in a given amount of time, such as the number of meters it travels per second. Wave speed is related to wavelength and wave frequency by the equation: Speed = Wavelength x Frequency. This equation can be used to calculate wave speed when wavelength and frequency are known.Wavelength:Wavelength is the distance between identical points (adjacent crests) in the adjacent cycles of a waveform signal propagated in space or along a wire. In wireless systems, this length is usually specified in meters (m), centimeters (cm) or millimeters (mm).Frequency:frequency, in physics, the number of waves that pass a fixed point in unit time; also, the number of cycles or vibrations undergone during one unit of time by a body in periodic motion.
Explanation:
An atom's electron configuration ends with 3p^3. if another atom has nine more electrons, what would be the continuation of the electron configuration?
The continuation of the electronic configuration would be [tex]3p^6, 4s^6, 3d^4.[/tex]
What is an electron configuration?Electronic configuration, also called electronic structure, is the arrangement of electrons in energy levels around an atomic nucleus.
The initial p-orbital (the [tex]3p^3[/tex]) is incompletely filled. Thus, the first thing would be to fill it completely ([tex]3p^6[/tex]) so as to obey the orbital-filling rule. This leaves 6 more electrons.
After 3p orbital, the next orbitals are 4s, 3d, 4p, 5s, etc.
The 4s orbital will take a maximum of 2 electrons, leaving 4 more electrons.
Next would be the 3d orbital which can take a maximum of 8 electrons, but only 4 electrons are left.
Thus, the electronic configuration would be [tex]3p^6, 4s^6, 3d^4.[/tex]and elements is Vanadium (V).
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A sample of gas at a constant temperature has an initial volume of 14.5L at a pressure of 720mmHg. If the volume of gas is decreased to 10.5L, what is its pressure?
The new pressure of the gas would be 994 mmHg
Gas lawAccording to Charle's law, the pressure of a gas at a constant temperature varies inversely with its volume.
Mathematically: p1v1 = p2v2, where p1 and p2 = initial and final pressure, and v1 and v2 = initial and final volume.
In this case, v1 = 14.5 L, p1 = 720 mmHg, and v2 = 10.5 L
p2 = p1v1/v2 = 720 x 14.5/10.5 = 994 mmHg
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how to Use your trend line to estimate the gas pressure of this system at 0°C.
Answer:
The slope of the trend line is 2.55; as the temperture.
Explanation:
Alkaline batteries are non-rechargeable.
Why do alkaline batteries eventually stop working?
Answer:
Alkaline batteries stop working when all of the manganese dioxide has been converted.
Explanation: Hope it helps you :)))
Have a good day
Alkaline batteries eventually stop working because the chemicals inside them react and eventually use up all their energy.
The chemicals in an alkaline battery are zinc and manganese dioxide, which are separated by a separator. When the battery is used, zinc and manganese dioxide react to produce electricity.
The reaction between zinc and manganese dioxide is a one-way reaction, meaning that it cannot be reversed. This means that once the chemicals in the battery are used up, the battery will no longer produce electricity.
The rate at which an alkaline battery loses its charge depends on a number of factors, including the temperature, the amount of current being drawn from the battery, and the age of the battery.
In general, alkaline batteries will last longer in cool temperatures and when they are not being used heavily.
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Which information must be known about a compound to find the molecular formula from the empirical formula?
Answer:
Empirical formulas can be determined from the percent composition of a compound. In order to determine its molecular formula, it is necessary to know the molar mass of the compound. Chemists use an instrument called a mass spectrometer to determine the molar mass of compounds.
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If an object goes through a chemical reaction but does not change in mass that object has
Answer:
The law of conservation of mass
Explanation:
The law of conservation of mass
When comparing voltaic cells to electrolytic cells, oxidation occurs at the.
When comparing voltaic and electrolytic cells oxidation occurs at both the anode and the cathode.
What is an electrolytic cell?In an electrolytic cell, the reaction is non-spontaneous so it requires some input of energy for it to function while for a voltaic cell, the reaction is spontaneous.
Oxidation occurs at the anode and reduction occurs at the cathode.
Thus, when comparing voltaic and electrolytic cells oxidation occurs at both the anode and the cathode.
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Which of these is a challenge related to nuclear fusion reactions?
A. Waste products have a longer half-life.
B. It is technically challenging to create these reactions safely and
efficiently.
C. The fuel for nuclear fusion is less available than uranium-235.
D. There is less of a chance of runaway chain reactions.
Answer:B
Explanation:got it right
The statement, "It is technically challenging to create nuclear fusion reactions safely and efficiently", is related to nuclear fusion reaction. Thus, Option B is correct.
This is due to the need to reach and maintain the extreme temperatures and pressures required for the reaction to occur and to confine and control the plasma in which the reaction takes place.
Nuclear fusion is a promising source of energy that has the potential to provide abundant, clean & sustainable power. However achieving nuclear fusion requires overcoming several challenges including the technical difficulties of creating and controlling the extreme conditions required for the reaction to occur.
Fusion reactions can produce high-energy neutrons that can damage the materials used to contain the reaction and require special handling and disposal. While progress has been made in developing fusion technologies, there is still much work to be done to make fusion a viable source of energy for the future.
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The following chemical reaction
2H2O + 3HCl ——> 5H2O + Cl
how many moles of H2O is needed to make 3 moles of HCl?
Answer: 2 moles
Explanation:
We know from the equation that for every 3 moles of HCl consumed, 2 moles of water are consumed (based on the coefficients)
So, the answer is 2 moles.
Which two statements describe how volcanic activity can affect Earth's crust?
A) A volcano are most likely to form near the center of tectonic plates
B) A volcanic mountain becomes smaller each time it erupts
C) A volcano can suddenly get taller every time it erupts
D) Hot magma from inside earth is released at weak points in the crust
Answer:
D
Explanation:
The weak crust of the earth does not hold together as well as strong crust.
Answer:
A and B was right in our test.
Explanation:
A was: A volcano can suddenly get taller every time it erupts
B was: Hot magma from inside Earth is released at weak points in the crust.
What is the ph of a solution with a hydroxide (oh) concentration of 2.02e-5?
Answer:
The solution has a pH value of 9.3.
Explanation:
To solve this problem, we can first determine the H+ ion concentration and then use this value to calculate the pH. To find the H+ ion concentration from the OH- ion concentration, we should use Kw, which we know has a value of 1 * 10^(-14).
We can then use the following formula to solve for [H+]:
Kw = [H+][OH-]
10^(-14) = (2.02 * 10^(-5)) * [H+]
[H+] = 4.950495 * 10^(-10)
Now, we can find the pH using the formula pH = -log[H+].
pH = - log[H+]
pH = - log(4.950495 * 10^(-10))
pH = 9.3
Therefore, the correct answer is that the pH of the solution is 9.3. Note that an alternative way to solve the problem is to find the pOH from the OH- ion concentration and use the resulting value to determine the pH that way instead.
Hope this helps!
How do chemical weathering and deposition contribute to the formation of the features shown here?
Draw a diagram using H+ signs and OH- symbols of a solution that is acidic. Hint: Use the
diagram seen in the prelab.
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More positive ions shows acidic whereas more negative ions indicates basic solution.
Which charge show acidic solution?That side which has more positive charges is considered as acidic solution while on the other hand, that region where negative charges are present in large number as compared to positive charges is considered as basic or alkaline solution.
So we can conclude that more positive ions shows acidic whereas more negative ions indicates basic solution.
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Determine the number of moles of O,(g) in the cylinder. The gram-formula mass of
Og (g) is 32.0 g/mol.
The number of mole of oxygen gas, O₂ in the cylinder given the data is 0.5 mole
Description of moleThe mole of a substance is related to it's mass and molar mass according to the following equation:
Mole = mass / molar mass
How to determine the mole of O₂From the question given, the following data were obtained:
Mass of O₂ = 16 g gMolar mass of O₂ = 32 g/mol Mole of O₂ =?Mole = mass / molar mass
Mole of O₂ = 16 / 32
Mole of O₂ = 0.5 mole
Complete question
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If 8. 0 ml of water is added to 2. 0 ml of a 0. 500 m koh solution, the concentration of koh is changed to.
Answer: 0.1 M
Explanation:
Originally, [tex]0.500=\frac{\text{moles of solute}}{0.002}[/tex], so there was 0.001 mol of KOH.
Now, there is 8.0+2.0=10.0 mL of solution, so the new concentration is:
[tex]\frac{0.001}{0.01}=\boxed{0.1 \text{ M}}[/tex]