If the molar volumes of liquid water and ice are 18.01 ml and 19.64 ml, respectively, then 1334 atm of pressure is required to melt ice at 10 C. 22.04 J/K is the entropy change process.
The term "molar" relates to the mole, which is the unit of concentration molarity and the number of moles in a liter of a solution. The phrase most frequently refers to the molar concentration of a solute in a solution in chemistry. The mol/L or M units of molar concentration are used. Molar also describes many molecular quantities including molar mass, molar heat capacity, and molar volume.
The most popular unit of measurement for molal concentration or molarity is moles of solute per liter of solution. It is defined as the amount of solute material per unit volume of solution, or per unit volume available to the species, and is denoted by the lowercase letter.
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Write a couple of sentences in you own words
Tell what group and period this element would be in from the picture below. 2pt
Describe how you determined it place using words like period, group, valence, energy shells 4pts
Determine what family it belongs to. 1pt
The picture shows the electronic configuration of Carbon which belongs to 14 group and 2nd period in the periodic table.
What do you mean by inert gas?A gas is said to be inert if it does not readily react chemically with other substances and does not afterwards produce chemical compounds. The noble gases, also known as the inert gases in the past, frequently do not react with numerous things.
In the figure there are 2 e in k shell 8 e in l shell and 2 e in last one. So total becomes 12 e. The Carbon contains 12 electron in shells , valence electrons are 2 electrons , group is 14 , period is 2 and family is Carbon family.
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Atoms bond together using chemical bonds;
chemical bonds are stored energy that hold atoms
together within a molecule. Would chemical bonds
be considered a form of kinetic energy or potential
energy? Explain.
Answer:
potential energy
Explanation:
they only store energy, so they’re not using it which would be kinetic energy.
study the steps in the reaction mechanism. elementary step 1: br2 no⟶br2no elementary step 2: br2no no⟶2brno give the overall reaction that this mechanism describes.
The mechanism of formation of Nitrosyl bromide from [tex]Br_2[/tex] and NO in a chemical reaction is depicted by the given elementary steps.
The outcome of a reaction combining nitrogen monoxide and [tex]Br_2[/tex] as our starting materials will be nitrosyl bromide; the final mixture will have a combination of all three chemicals.
Nitrosyl bromide is a red gas that condenses slightly below room temperature. The reversible reaction of nitric oxide with bromine can produce nitrosyl bromide.
Overall reaction can be obtained by adding the given two elementary steps:
[tex]Br_2 + NO \rightarrow Br_2NO\\Br_2NO + NO \rightarrow 2BrNO[/tex]
On addition of the above two reactions,
[tex]Br_2 + Br_2NO + 2NO \rightarrow Br_2NO + 2BrNO[/tex]
The overall reaction obtained is:
[tex]Br_2 + 2NO \rightarrow 2BrNO[/tex]
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A sample of natural sulfur consists of three isotopes:
95.0% sulfur-32 (31.97 amu)
0.75% sulfur-33 (32.97 amu)
4.21% sulfur-34 (33.96 amu)
Based on this information, what is the average molar mass of sulfur?
Answer
A
31.92 g/mol
B
32.00 g/mol
C
32.80 g/mol
D
32.05 g/mol
Average molar mass of sulfur is 32.80 g/mol
The average atomic mass of a chemical element is calculated by taking into account the atomic masses of its naturally occurring isotopes and their respective abundances
Here given data is
95.0% sulfur= 32 (31.97 amu)
0.75% sulfur= 33 (32.97 amu)
4.21% sulfur= 34 (33.96 amu)
We have to find average molar mass of sulfur = ?
Average molar mass = ∑i × isotope of i × abundance of i
Average molar mass = 31.97×95.0 + 32.97 ×0.75 + 33.96×4.21
Average molar mass = 32.80 g/mol
Average molar mass of sulfur is 32.80 g/mol
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A 224g sample of water cools down from 56°C to 20°C. The specific heat of water is 4.184 J/g°C. What amount of heat energy was lost?
When 224 g sample of water cools down from 56°C to 20°C with specific heat of water 4.184 J/g °C, the amount of heat energy lost is 33,739 J
Given that,
Mass (m) = 224 g
Specific heat (C) = 4.184 J/g ℃
Initial temperature = 56 ℃
Final temperature = 20 ℃
Heat energy = (mass) × (specific heat) × (change in temperature)
Q = m × C × ΔT
Q = 224 × 4.184 × (56 – 20)
Q = 224 × 4.184 × 36
Q = 33,739 J
Therefore, the heat energy that was lost in the process is 33,739 J
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1. State the general period and group trends among
main-group elements with respect to each of the
following properties:
a. atomic radii
b. first ionization energy
c. electron affinity
d. ionic radii
e. electronegativity
2. a. In general, how do the periodic properties of
the d-block elements compare with those of
the main-group elements?
b. Explain the comparison made in (a).
3. For each main-group element, what is the
relationship between its group number and
the number of valence electrons that the group
members have?
Explanation:
ok so I believe:
a. increase in atomic radii going down a group and decrease going across a period.
b. increase in IE1 going across a period and up a group. the highest IE1 elements are like He, Ne, F and first ionization energy decreases moving further away from those elements moving south west on the periodic table.
c. electron affinity increases moving across a period left to right.
d. ionic radii increases going down a group and decreases going across a period left to right
e. electronegativity increases across a period but decreases down a group. (opposite for electropositivity)
what is meant by the d-block elements? are you referring to the spdf location?
Which letter(s) represent(s) a phase change occuring?
Answer:
A= solid
B= Melting and freezing
C= Liquid
All side lengths of ΔJKL equal 2 units. A transformation maps ΔJKL to ΔJ'K'L'. The length of side J'K' is 5 units. Is this a rigid transformation?
No, there is no one-to-one mapping of all the points of the pre-image to the image.
No, at least one segment length is not preserved, making this a nonrigid transformation.
Yes, the vertices of the pre-image map to the vertices of the image.
Yes, all of the side lengths of the pre-image are proportionate to the image.
No, at least one segment length is not preserved, making this a nonrigid transformation.
This transformation is nonrigid since it does not retain the length of at least one segment.
An isometry, often known as a rigid transformation of the plane, preserves length.
Reflections, translations, and rotations, are a combination of these three transformations and are all considered "rigid transformations".
The idea of a rigid transformation is that neither the size nor the shape is changed.
The second response, which results in a unit with a length of 5 units, is valid because segment JK's length of 2 units is not preserved when it is mapped onto segment J'K'.
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If salinity does not change, how does seawater density change as temperature changes?
The density of water decreases as it becomes warmer, more space. When comparing two samples same salinity of water, sample with the higher temperature will have more volume and hence be less dense.
What causes the salinity?The accumulation of salt from rainfall over a long period of time or the weathering of rocks are two examples of natural processes that contribute to primary salinity.
How salinity is measured?By running an electric current between a salinity meter's two electrodes in a sample of soil or water, it is possible to determine the salinity of both water and soil. The quantity and make-up of dissolved salts affect the electrical conductivity, or EC, of a soil or water sample.
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what is the role water plays in how macromolecules function in the body ?
how does water help macromolecules carry out their functions ?
Answer:
binomial
Explanation:
because the fact that macromolecules is carry out with functions constant-1,2,3,4 etc
a 3.0-l sample of helium was placed in a container fitted with a porous membrane. half of the helium effused through the membrane in 13 hours. a 3.0-l sample of oxygen was placed in an identical container. how many hours will it take for half of the oxygen to effuse through the membrane?
The total time taken by half of the oxygen to effuse through the membrane is 68.18 hours.
The rate of effusion can be calculated by :
r = V/t
r = 1.5 L/24hr
r = 0.0626 L/hr
According to Graham's Law, effusion is inversely proportional to the square root of their molar mass.
[tex]\frac{r1}{r2}[/tex] = √[tex]\frac{M2}{M1}[/tex]
The molar mass of He is 4 g/mol and molar mass of O is 32 g/ mol.
Putting the values
0.0626 L/hr ÷ [tex]r_{2}[/tex] = √32/4
[tex]r_{2}[/tex] = 0.022 L/hr
Therefore, the time taken for effusion of half of 3 L that is 1.5 L of oxygen is:
Time = 1.5 L/ 0.022L/hr = 68.18 hours
Hence, the total time taken by half of the oxygen to effuse through the membrane is 68.18 hours.
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The specimen at 100x zoom can be identified as an Animal cell as per the observations of it containing the cytoplasmic elements like the cytosol.
The contents of an animal cellOrganelles, cytoplasmic elements, the cytosol, and the cell membrane make up the normal structure of an animal cell.
Each of the cell's organelles is a membrane-bound structure with a specific function. Animal cells are the kind of typical eukaryotic cells because they have the presence of a membrane-bound nucleus and organelles and are encased in a plasma membrane.
Animal cells lack a cell wall, in contrast to eukaryotic cells found in plants and fungus. The building blocks of all living things in the kingdom Animalia are called animal cells.
They give bodies shape, take in nutrients to turn into energy, and aid in animal movement. They are also capable of self-replication and contain all an organism's genetic material.
The biggest organelle in animal cells is the nucleus. Cell activity is controlled by the nucleus. It also includes the chromosomes of the cell.
The genetic material (DNA) that makes you who you are is contained in the chromosomes.
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HELP ME 41 POINTS FR FR
a 0.458 g sample of khp (molar mass 204.22 g/mol) is titrated to a pink phenolphthalein endpoint with 12.84 ml of a naoh solution. what is the concentration of the solution?
0.175M is found to be the concentration of the solution from the given titration reaction.
The idea of concentration is one that is frequently utilized in chemistry and related domains. It is a measurement of how much of one substance is diluted with another.
A chemical species' concentration in a solution, specifically the quantity of a solute per unit volume of solution, is measured by its molar concentration.
Given:
Weight = 0.458g
Volume = 12.84mL
Molecular weight = 204.22g/mol
To find:
Concentration = ?
Formula:
Concentration = no. of moles / volume
Calculations:
No. of moles = weight given / molecular weight
No. of moles = 0.458 / 204.22g/mol
No. of moles = 2.242 x [tex]10^{-3}[/tex] mol
Concentration = 2.242 x [tex]10^{-3}[/tex] / 12.84mL
Concentration = 0.175M
Result:
The concentration of the given solution is found to be 0.175M
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In a neutralization reaction, water is formed from
Answer:
A neutralization reaction is when an acid and a base react to form water and a salt and involves the combination of H+ ions and OH- ions to generate water
Make Me As Brainliest
Answer:
it's b
hydrogen ions and hydroxide ions...
hope it helps you
14. On what substance might you find a plastic fingerprint? *
A.A bar of soap
B.On a door frame
C.A piece of paper
D.OA blood covered floor tile
Answer:
Soap
Explanation:
an unknown compound containing tellurium and bromine is analyzed and it is determined that 28.53% of the compound by mass is composed of tellurium. what is the mass percent of br in the compound?
The mass percent of bromine in this tellurium and bromine compound is 71.47%.
If the compound is made up only of tellurium and bromine, then if the mass percent of tellurium is 28.53%, we can safely assume that the rest is bromine. So, we take the 100% and subtract the mass percent of tellurium to calculate the mass percent of bromine:
100% - 28.53% = 71.47%
The mass percentage of bromine in this compound is 71.47%.
We can even use this data and the molar masses of tellurium and bromine to calculate the empirical formula of the compound if needed.
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HELP ASAP! Will mark brainliest for correct answer
The density data for a
substance was collected in
the table to the right. The
substance is known to have a
density of 7.4 g/mL. What is
the percent error for the data?
A. about 12%
B. about 0.12%
C. about 14%
D. about 0.14%
The correct option is A.
The percentage error in the measurement of the density is about 12%.
What is error in measurement?The error in any measurement is the difference between the actual measurement of the substance and the estimated measurement of the substance.
The percentage error is obtained by dividing the error in the measurement by actual measurement and multiply the result by 100%.
The average density measurement = 6.5 g/mL
error = actual measurement - estimated measurement
error = 7.4 g/mL - 6.5 g/mL
error = 0.9 g/mL
percentage error = (0.9 / 7.4) x 100%
percentage error = 12.16 %
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perfect gas is a hypothetical gas in which the volume of the individual atoms (molecules) is negligible compared to the total volume of the container.
Perfect gas is a hypothetical gas in which the volume of the individual atoms (molecules) is negligible compared to the total volume of the container is true.
For a gas to be ideal, it has to follow the following rules.
The volume of molecules of a Perfect gas also known as an ideal gas has to be almost negligible as compared to the volume of the container.
The molecules do not attract or repel each other. They hardly collide with other in an elastic collision. This elastic collision also happens with the wall of the container.
So according to the first rule, the volume of individual molecules is negligible as compared to the the total volume of the container.
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What part of an atom takes up all the volume or space
The cloud of electrons surrounding the nucleolus of an atom takes up all the volume or space.
What is an atom?The simplest unit of matter is the atom. As matter makes up everything in the universe (apart from energy), atoms are the building blocks of matter.
The protons, neutrons, and electrons that make up an atom are three different types of incredibly small particles known as subatomic particles. The nucleus of the atom, which is made up of protons and neutrons, is where all the action happens, and an electron cloud flies around it.
In contrast to the protons, which have a positive charge, electrons have a negative charge. Both protons and electrons are equal in number in a typical (neutral) atom. The quantity of neutrons is also usually the same, though not always.
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How many grams are there in 8.99x1024 atoms of carbon
The atomic weight of one carbon atom = 12 amu
Mass of 1 mole of carbon atoms = 1 × atomic weight of one carbon
= 12 gm
Since we already know that the atomic mass is specified for one mole of the atom, we may get the mass of one atom by dividing the mass by Avogadro's number.
The mass of one atom of carbon is = Atomic mass/Avogadro number
= 12g/6.022×10^23
= 126.022×10^−23g
= 1.9933×10^−23g
Hence, the mass of 1 carbon atom is 1.9933×10^−23grams
Now,
Mass of 8.99 x 10^24 atoms = (8.99 x 10^24) x (mass of 1 carbon atom)
⇒ Mass of 8.99 x 10^24 atoms = 8.99 x 10^24 x 1.9933×10^−23grams
⇒ Mass of 8.99 x 10^24 atoms = 17.919767 x 10
⇒ Mass of 8.99 x 10^24 atoms = 179.2 g (approx.)
What is Mole concept?A practical way to indicate the quantity of a substance is using the mole concept. The numerical value and the units in which the magnitude is represented can be used to decompose any measurement into two pieces.For instance, the magnitude and unit are "2" and "kilogram," respectively, when a ball's mass is determined to be 2 kilograms.One gram of a pure element is considered to possess a staggering number of atoms when discussing particles at the atomic (or molecular) level. The term "mole" is frequently used in this context. The unit called a "mole," which is a count of a huge number of particles.A mole is the measure of a substance that includes precisely 6.02214076 * 10^23 of the substance's "elementary entities," according to the science of chemistry.To learn more about Mole concept, refer to:
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the specific rotation of a pure substance is 10degrees. a mixture of this substanc eand its enantiomer has an observed specific rotation of 2 degrees. what is the eprcentage of the excess steroisomer in the mixture
The percentage of the excess stereoisomer in the mixture c.25%.
Stereoisomerism, or spatial isomerism, is a form of isomerism wherein molecules have the same molecular components and series of bonded atoms, but fluctuate in the three-dimensional orientations of their atoms in space.
The observed rotation of the mixture is levorotary (terrible, counter-clockwise), and the precise rotation of the pure S enantiomer is given as dextrorotary (fantastic, clockwise), which means that the pure R enantiomer should be levorotary, and the mixture has to comprise extra of the R enantiomer than of the S enantiomer.
Enantiomers have the same chemical and bodily homes and are indistinguishable from every other except for the route of rotation of the plane of polarized mild. they're described as optically lively.
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Disclaimer:- your question is incomplete, please see below for the complete question.
the specific rotation of a pure substance is 10 degrees. a mixture of this substance and its enantiomer has an observed specific rotation of 2 degrees. what is the percentage of the excess stereoisomer in the mixture
a.50% b.75% c.25% d.0% e.80%
a heliox deep-sea diving mixture contains 2.0 g of oxygen to every 98.0 g of helium. what is the partial pressure of oxygen when this mixture is delivered at a total pressure of 8.2 atm ?
The partial pressure of oxygen when the mixture is delivered at pressure of 8.2 atm is 0.020 atm.
What is partial pressure?Each gas that makes up a mixture of gases has a partial pressure, which is the notional pressure of that gas as if it alone filled the original combination's complete volume at the same temperature.
The formula, which calculates partial pressure,
Total pressure = partial pressure Mole fraction
Mole proportion of oxygen in a mixture is equal to the sum of the moles of oxygen and helium.
109 grams are equal to one gigagram, or gg.
= 2 × 10⁹/32 /2 × 10⁹/32 + 98 × 10⁹ / 4
= 2.54 × 10⁻³
oxygen's partial pressure is equal to its mole fraction plus its overall pressure.
= 2.54 × 10⁻³ × 8.0 atm
= 0.02032 atm
= 0.020 atm
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A seed-bearing plant starts its growth from?
A: An egg cell
B: A Sperm Cell
C: The Joining Of Egg And Sperm Cells
A seed-bearing plant starts its growth from the Joining Of Egg And Sperm Cells in order to form a zygote cell (Option C)
What is a zygote cell?A zygote cell is the first cell product of the process of fertilization, which involves the fusion of a sperm (in this case a pollen grain because we are talking about plants) and one egg cell.
Therefore, with this information, we can conclude that a zygote cell is generated by fertilization and it is the start of diploid life both in plants and animals.
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Which element has the following electron configuration? 1s^2 2s^2 2p^2 3s^2 3p^6 4s^2 3d^10 4p^5
NASA communicates with the Space Shuttle and International Space Station using Ku-band microwave radio. Suppose NASA transmits a microwave signal to the Space Shuttle using radio waves with a frequency of 14 GHz. Calculate the wavelength of these radio waves.
Be sure your answer has the correct number of significant digits.
The wavelength of these radio waves with a frequency 14GHz is equal to 0.0214m.
What is microwave communication?Microwave transmission is the transmission of information by using electromagnetic waves within the frequencies 1GHz to 300GHz are called microwaves.
The transmission of signals either directly or via a satellite by sending microwaves. The receivers for microwave signals are disc-shaped antennae and are often seen installed in business locations or near private homes.
The relationship between frequency (ν) and wavelength (λ) can be expressed as follow:
λ = c/ν
Given, the frequency of the radiowaves = 14 GHz
Change the frequency into (per second) = 14 × 10⁹ s⁻¹
The wavelength of the radiowaves can be calculated from, λ = c/ν
where c = 3× 10⁸ m/s is the speed of light.
λ = c/ν = 3× 10⁸ m/s./ 14 × 10⁹ s⁻¹
λ = 0.0214 m
Therefore, the wavelength of these radio waves is equal to 0.0214m.
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1. What is conductivity? How can electrical conductivity be measured?
2. What does an electrical conductivity probe consist of?
3. How does an electrical conductivity probe work?
4. What is current flowing through the water proportional to?
5. What happens when there is a higher dissolved salt/ion concentration?
6. What is an electrolyte?
Because there are free electrons present, solid copper conducts electricity. CuCl2(g) does not conduct electricity because it contains no free electrons.
Because free electrons are drawn to metal cations by electrostatic forces in the metallic connection, metals are referred to as conductors of electricity. The conductivity of solid metals is accounted for by these free electrons.
What is conductivity?
The word "conductivity" is used to describe a number of physical phenomena. In terms of heat, conductivity is the amount of heat that moves through a slab with a unit cross-sectional area per second when there is no temperature difference between the two faces.
Conductivity is a helpful indicator of water quality in general. Every body of water has a typical conductivity range that, once determined, can be used as a reference point for comparison with routine conductivity tests.
What is electrolyte ?
A medium that contains ions and is electrically conducting due to the mobility of those ions but does not conduct electrons is called an electrolyte. This contains the majority of salts, acids, and bases that are soluble when dissolved in polar solvents like water.
Along with magnesium, calcium, phosphate, and bicarbonates, sodium, potassium, and chloride are the important electrolytes. We obtain electrolytes from our diet and drinks. Unbalanced amounts of these electrolytes might result in either high or low levels.
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If the volume of a sample of gas is doubled while holding the temperature of the gas constant, then the pressure of the gas is.
If the volume of a sample of gas is doubled while holding the temperature of the gas constant, then the pressure of the gas is half the initial pressure.
What is the effect of change in the volume of a gas at the constant temperature on the pressure of the gas?The relationship between the volume and pressure of a gas is given by Boyle's law of gases.
The equation of Boyle's law of gases is given as follows:
P₁V₁ = P₂V₂
Where;
P₁ is the initial pressureP₂ is the final pressureV₁ is the initial volumeV₂ is the final volumeSolving for the final pressure of the gas;
V₂ = 2 V₁
P₂ = P₁ * V₁ / 2 V₁
P₂ = P₁ / 2
Hence, the final pressure is half the initial pressure.
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Explain the difference between an atom and an ion
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the kitchen drain is blockrd witb grease. using your knowledfe of chemical reactions and transfer of enerhy, how can tou unpljg this drain without physically touching the blockage
Following are the methods to unplug this drain without physically touching the blockage.
1. Pour hot, boiled water down a drain.
If you choose to attempt to clear a grease blockage on your own and you are certain that your plumbing system is made up of metal pipes rather than plastic, you might try flushing it out with hot water. If your pipes are constructed of plastic, we wouldn't recommend trying this because you run the risk of melting or weakening the joints.
2. Hot water and vinegar
A 50:50 solution of hot, boiling water and vinegar performs similarly to the commercial chemical drain cleaner (and is just as effective). The advantage of a homemade vinegar and water solution is that it is non-toxic and substantially less corrosive than commercial drain cleaners. Grease that has accumulated on the inside walls of your pipes is dissolved by warm water and vinegar. Give yourself another dose a few minutes later if the first dose doesn't work.
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