Heat is transmitted from hot to cold areas of a substance due to thermal conductivity.
What is thermal conductivity?When a temperature gradient leaves a region perpendicular to it, thermal conductivity is the rate of heat transfer by conduction through the material's unit cross-section area.
Thermal conductivity is measured in Watts per meter of thickness, per degree of temperature difference between two sides (W/mK). The amount of heat energy that a substance can convey depends on its thermal conductivity.
Thermal conductivity is the quantity and rate of heat transmission through a material. High thermal conductivity materials move heat more quickly than materials with poor thermal conductivity.
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A nitrogen oxide contains 30. 45% n mass. If the molar mass of the compound is 90. ± 5 g/mol, what is its molecular formula?.
[tex]N_{(1*2)} O_{(2*2)} = N_{2} O_{4}[/tex] this is the molecular formula.
How do you locate the molecular formula?Divide the compound's molar mass by the empirical formula molar mass. The outcome should be a whole number or very close to one. Multiply the whole number found in step 2 by all the subscripts in the empirical formula. The molecular formula is the end result.An empirical formula is the simplest whole-number ratio of the various atoms in a compound. The molecular formula specifies the number of different types of atoms present in a compound molecule.With the given molar mass or the molecular formula mass, we can get the whole-number multiple for the compound.Whole-number multiple =[tex]\frac{90 g/mol}{46.01 g/mol}[/tex] ≈ 2
Multiplying the subscripts of [tex]N_{1} O_{2}[/tex] by 2, the molecular formula is
[tex]N_{(1*2)} O_{(2*2)} = N_{2} O_{4}[/tex]
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please help 100 points.
Answer:
Look up the periodic table and it will tell you what is what or you can ask for a hint and if that doesn't help look up "beryllium Atomic number, Mass number, Protons, electrons, and Neutrons." and do that for the rest of them.
Answer:
dw I gotchu
Explanation:
Calculate the molarity of Br- in 150.0 mL of aqueous solution that contains 5.07 g of zinc bromide
The molarity of the bromide ion, Br¯ in the solution is 0.3 M
What is molarity?Molarity is defined as the mole of solute per unit litre of solution. Mathematically, it can be expressed as:
Molarity = mole / Volume
How to determine the molarity of the zinc bromide, ZnBr₂Mass of zinc bromide = 5.07 gMolar mass of zinc bromide = 225.198 g/molMole of zinc bromide = 5.07 / 225.198 = 0.0225 moleVolume = 150 mL = 150 / 1000 = 0.15 LMolarity of zinc bromide =?Molarity = mole / Volume
Molarity of zinc bromide = 0.0225 / 0.15
Molarity of zinc bromide = 0.15 M
How to determine the molarity of bromide ion, Br¯Dissociation equation
ZnBr₂(aq) -> Zn²⁺(aq) + 2Br¯(aq)
From the balanced equation above,
1 mole of ZnBr₂ contains 2 moles of Br¯
Therefore,
0.15 M ZnBr₂ will contain = 0.15 × 2 = 0.3 M Br¯
Thus, the molarity of bromide ion, Br¯ in the solution is 0.3 M
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Consider the reaction, h2 i2 => 2 hi , which is found to be half order in i2 and first order in h2. which step of the proposed mechanism must be slow in order to agree with this rate law?
3rd step of the proposed mechanism must be slow in order to agree with this rate law in the reaction, h2 i2 => 2 hi , which is found to be half order in i2 and first order in h2.
What is hydrogen?Having the atomic number 1 and the letter H, hydrogen is the first chemical element. The lightest substance is hydrogen. Hydrogen has the formula H2 and exists as a gas under normal conditions. It burns easily and is non-toxic, tasteless, colorless, odorless, and odorless.
With approximately 75% of all normal matter made up of hydrogen, it is the most prevalent chemical in the universe. The majority of hydrogen in plasma stars like the Sun is hydrogen. Water and organic compounds are two examples of molecules that contain the majority of the hydrogen that exists on Earth.
One proton, one electron, and no neutrons are present in each atom of the most prevalent isotope of hydrogen (symbol 1H).
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Full question
Consider the reaction, H2 + I2 => 2 HI , which is found to be first order in I2 and first order in H2. Which step of the proposed mechanism must be slow in order to agree with this rate law?
I 2 => 2 I
I + H2 => H2I
H2I + I => 2 HI
1. 2
2. 3
3. 1
4. Either 2 or 3
A 5. 00 gram sample of lead and a 3. 20 g sample of iron are placed into 367 ml of water. What will be the new volume level of water in units of ml? the density of lead is 11. 34 g/cc and the density of iron is 7. 874 g/cc. Do not enter ""ml"" as part of your answer.
without the unit (ml), the answer is 368.
What does the term "density" mean?Density is the number of things (people, animals, plants, or objects) in a given area. To calculate density, divide the number of objects by the area measurement. A country's population density is the number of people divided by its area in square kilometers or miles.Density is dependent on mass and volume of a substance and can be defined as the ratio of mass to volume.In other words:
density = mass/volume
or
volume = mass/density
In this case, we need to determine the volume of added lead and iron to figure out the final volume of the water sample.
Volume of lead = mass of lead / density of lead = 5 gm / 11.34 g/cc = 0.441 cc or 0.441 ml
Similarly,
volume of iron = mass of iron / density of iron
= 3.2 g / 7.874 g/cc
= 0.406 cc or 0.406 ml
The new volume of water sample = original volume of water + volume of lead + volume of iron = 367 ml + 0.441 ml + 0.406 ml = 367.847 ml
To the 3 significant figures and without the unit (ml), the answer is 368.
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Explain two events: (1) placing a hot
pack on your skin and making your skin feel warmer, and (2) placing a cold pack
on your skin and making your skin feel colder
A 20.0-liter flask contains a mixture of argon at 0.72 atmosphere and oxygen at 1.65 atmospheres. what is the total pressure in the flask? a. 0.93 atm b. 2.37 atm c. 8.44 atm d. 18.6 atm
A 20.0-liter flask contains a mixture of argon at 0.72 atmosphere and oxygen at 1.65 atmospheres. The total pressure in the flask is 2.37 atm.
The macroscopic characteristics of ideal gases are related by the ideal gas law (PV = nRT). A gas is considered to be perfect if its particles (a) do not interact with one another and (b) occupy no space (have no volume).
The partial pressures of the gases in a mixture of gases are added to determine the total pressure in the flask. This is the partial pressures law of Dalton.
The total pressure of the gases = P1+P2+P3+..Pn=[tex]P_{total}[/tex]
Therefore, in the given scenario, the flask's total pressure will be equal to 0.72+1.65 = 2.37 atm. Therefore, when a 20.0-liter flask includes a mixture of argon at 0.72 atmospheres and oxygen at 1.65 atmospheres, the total pressure in the flask is 2.37 atm.
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a naturally occurring sample of an element contains only two isotopes. the first isotope has a mass of 120.9038 amu and a natural abundance of 57.4%. the second isotope has a mass of 122.9042 amu. find the atomic mass of the element.
Every existing particle or an element has a certain amount of matter. Everything is made of atoms. The matter content of an atomic particle is called the atomic mass.
Atomic mass of two isotopes is given as:
X1 = 120.9038 amu with a natural abundance of 57.4%.
X2 = 122.9042 amu
Natural abundance for the X2 element would be 100 - 57.4% = 42.6%
Individual contribution made by both the elements would be product of their atomic masses and their natural abundance.
For X1
= 120.9038 * 57.4%.
= 120.9038 * 0.574
= 69.4 u
For X2
= 122.9042 * 42.6%
= 122.9042 * 0.426
= 52.8 u
Total mass = 69.4 u + 52.8 u = 121.8 u
Answer: The atomic mass of the element is 121.8 u.
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to determine the freezing point depression of a licl solution, toni dissolved 0.393 g of licl in 20.3 ml of distilled water. determine the molal concentration (m) of the resulting solution. mwlicl
To determine the freezing point depression of a LiCl solution, toni dissolved 0.393 g of LiCl in 20.3 mL of distilled water. The molal concentration of the resulting solution is determined to be 0.453 m.
Molal concentration is the measure of the concentration number of moles of solute in 1 kg of solvent.
To calculate the molal concentration -
Calculate the mass of LiCl -
mass = density x volme
mass = 1 g/mL x 20.3 mL
mass = 20.3 g
mass = 0.0203 kg
Calculate the moles of LiCl:
Number of moles = Given mass
Molar mass
n = 0.393 g = 9.2 x 10⁻³ mol
42.394 g/mol
So, the molal concentration is,
M = 9.2 x 10⁻³ mol
0.0203 kg
M = 0.453 m
Therefore, the molal concentration of the resulting solution is 0.453 m.
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whats a chemical reaction
the _________ in the equation means a reaction is happening
Please help with this question ignore the highlighted choice all I know is that it's not C or the 3rd one
If more solute is added to a solvent, more than is able to dissolve at a given temperature, a(n)?
If more solute is added to a solvent, more than is able to dissolve at a given temperature, a(n) equilibrium will be established between dissolved and undissolved solute.
What is an equilibrium ?A condition of an item known as equilibrium is one in which two or more opposing forces, whether internal, external, or a combination of both, act on it and cancel one another out to maintain the object in the same state as before. The Latin word libra, which meaning weight or balance, is the word's etymological ancestor.
Here are a few instances of equilibrium:
A book that is open and at resta vehicle which is driving at a steady speeda chemical process where the rates of the forward and reverse reactions are equalLearn more about equilibrium
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The periodic table is arranged by various patterns. Is there a pattern with regard to ionic charge? In three to five sentences, explain your reasoning and provide specific examples
Yes, there is a pattern about the ionic charge because the left-side elements in the periodic table have cation ions whereas the right-side elements have anions.
What is the pattern of ionic charge in the periodic table?Ions are formed because of the addition of electrons or the removal of electrons from an atom or molecules or other ions. Across a period, a nuclear charge of an atom increases while the electron shielding remains constant. A higher effective nuclear charge leads to greater attraction of the electrons which results in a smaller atomic radius of an atom. On the right side of the periodic table, elements accept electrons and become negative ions i.e. anions whereas elements on the left side lose an electron and become positive ions i.e. cations.
So we can conclude that due to the losing of the electron the left side of elements in the periodic table has a cation ion whereas the right side of elements has an anion because of the addition of electrons.
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9) Which compound is ionic?
a. CO2
b. H2O
c. KCl
d. SCl2
Which statement is true about the environment
of most of Earth?
(1) It is usually greatly unbalanced.
(2) It is usually in equilibrium and hard
to change.
(3) It is usually in equilibrium but easy to change
on a small scale.
(4) It is normally heavily polluted by natural
occurrences.
The statement true about the environment of most of the earth is that it usually in equilibrium but easy to change on a small scale.
The balance between the energy flowing in from the Sun and the energy leaving the Earth is known as the earth-atmosphere energy balance. Both shortwave and ultraviolet energy are emitted when the Sun releases energy. When it gets to the Earth, some of it is absorbed by the atmosphere, some is reflected back to space by clouds, and some is absorbed at the surface of the planet.The global energy balance is particularly dependent on the absorption of infrared radiation that the Earth is trying to send back into space.The moon, which has no atmosphere, has an average surface temperature of 0°F (-18°C). The average surface temperature of the Earth is 59°F (15°C), in comparison. This effect is called green house effect.This Equilibrium of Earth and atmosphere can change with variation in green house gases.Therefore, Option 3 is correct statement
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Nitric acid is a component of acid rain that forms when gaseous nitrogen dioxide pollutant reacts with gaseous oxygen and liquid water to form aqueous nitric acid. True or false?.
Answer:
true.nitric acid reacts with those chemicals to form aqueous nitric acid
Calculate the density of Freon 12, CF2Cl2, at 30. 0 °C and 0. 954 atm.
[R=0. 08206 L atm/mol K] [CF2Cl2=120. 91g/mol]
By ideal gas approximation, the density of freon is 4.604 g/L.
We need to know about the ideal gas theory to solve this problem. The ideal gas is assumed that there is no interaction between particles in a gas. It can be determined by the equation
P . V = n . R . T
where P is pressure, V is volume, n is the number of moles gas, R is the ideal gas constant (8.31 J/mol.K) and T is temperature.
using the density of gas
P . V = n . R . T
P . V = gr / Mr . R . T
P . Mr = gr / V . R . T
P . Mr = ρ . R . T
where ρ is density and Mr is the molar mass
From the question above, we know that
T = 30⁰ C = 303 K
P = 0.954 atm
R = 0. 08206 L atm/mol K]
Mr = 120
By substituting the given parameters, we get
P . Mr = ρ . R . T
ρ = P . Mr / (R . T)
ρ = 0.954 . 120 / (0.08206 . 303)
ρ = 4.604 g/L
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SOMEONE PLEASE ANSWER MY QUESTION.
12.
(01.04 MC)
What is the most likely evidence of an energy transformation taking place when a wire that is twisted and turned breaks? (5 points)
1. Reddish glow is emitted as kinetic energy is transformed into thermal energy
2. Reddish glow is emitted as kinetic energy is transformed into electrical energy
3. Broken end of the wire turns hot as kinetic energy is transformed into thermal energy
4. Broken end of the wire turns hot as kinetic energy is transformed into electrical energy
The most likely evidence of an energy transformation taking place when a wire that is twisted and turned breaks is as follows:
The broken end of the wire turns hot as kinetic energy is transformed into thermal energy.Thus, the correct option for this question is C.
What is Energy transformation?Energy transformation may be defined as the process that significantly involves the conversion of one form of energy into another or the migration of energy from one place to another.
According to the context of this question, the wire is an electrical appliance that might be heated due to excessive usage. Due to this, the energy of motion which is known as kinetic energy gets transformed into thermal energy when its ends are broken.
Therefore, the correct option for this question is C.
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Metals participate in two types of single-displacement reactions. A reactive metal can displace _____ gas either from water or from an aqueous acid. A _____ reactive metal can also displace the ion of a _____ reactive metal from solution.
Answer:
c. H₂; more; less
Explanation:
What is the relationship between the number of protons in an atom and the atoms identity.
Answer:
Explanation:
The number of protons is considered as the atomic number of the element in the periodic table
This gaseous element has 5 valence electrons and few
sodium.
The gaseous element having 5 valence electrons and fewer neutrons than sodium is Nitrogen.
Nitrogen has the atomic number 7, and it is represented by the symbol 'N'. Nitrogen is a nonmetallic compound and is light in weight. It is found in abundance in the atmosphere. Nitrogen usually exists in oxidation states of -3, +3, and +5. It has five valence electrons, 7 protons, and 7 neutrons, while the number of protons and neutrons in Sodium having atomic number 11 are 11 and 12 respectively. The atomic configuration of nitrogen is 1s², 2s², and 2p³. Valence electrons may be defined as the number of electrons that can be lost or gained by an atom to achieve the configuration of noble or inert gases.
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Match the definitions to the atomic models. Model names may be used more than once
PLEASE HURRY
Answer: 1)Nuclear Model 2)Bohr model 3)Plum pudding model 4)Quantum mechanical model 5)Quantum Mechanical model 6)Plum pudding model 7) Bohr model
Explanation:
When a vinegar and oil salad dressing separates into two layers, the oil floats on top of the vinegar. the density of the oil_____the density of the vinegar.
Answer:
Is less than
Explanation:
Vinegar contains more chemicals and molecules in it thus has a higher density thus pushing the oil upward because there is no room for the oil
When a vinegar and oil salad dressing separates into two layers, the oil floats on top of the vinegar, the density of the oil is less than the density of the vinegar.
What is density?A substance's density is a measurement of how heavy it is in relation to its size. When placed in water, an object will float if its density is lower than that of the water, whereas it will sink if its density is higher.
The density of a material is a distinguishing quality that is independent of the substance's volume.
A nonpolar material won't dissolve in a polar one. When oil and vinegar are combined, the vinegar is more thick and polar than the oil and sinks to the bottom of the container.
Because it is nonpolar and less thick than the vinegar, the oil floats on top rather than dissolving in it.
Thus, the density of oil is less than the vinegar.
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Why is the application of heat or a surface-active agent not required during the application of the counterstain in acid-fast staining?
The application of heat or a surface-active agent not required during the application of the counterstain in acid-fast staining because "The dye is driven into the cytoplasm as well as lipoidal wall by heat.
A surface active agent, also known as a surfactant, is just an element that is positively adsorbed at the liquid-vapor interface as well as other interfaces and lowers the surface tension of something like the medium in which it was dissolved and also the interfacial tension with some other phases.
Carbolfuchsin was employed as the primary stain. Heat, as well as phenol, as well as phenol, is then administered to the cells to help the blemish penetrate the waxy surface of such acid-fast microorganisms.
In order for the stain to permeate the mycobacteria's cell wall, the wetting ingredient territory lowers the surface tension separating them.
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A student measures the mass of an graduated cylinder to be
14.13 g. They then fill the graduated cylinder with a liquid to a
volume of 19 mL. The mass of the liquid is measured to bbe
59.08 g. An object is then placed in the graduated cylinder.
The volume is then measured to be 41.6 mL. If the final mass
of the cylinder, object, and fluid is measured to be 91.2 g, what
is the density of the object?
Answer:
Density=189.9/226ml.
Explanation:
total mass=91.2g.
41.6ml-19ml=22.6ml of the object.
mass of the object=91.2-71.21=18.99g.
so D=M/V.
D=18.99/22.6.
D=189.9g/226ml
how pollutant gas become water pollution
Answer:
In the atmosphere, water particles mix with carbon dioxide sulphur dioxide and nitrogen oxides, this forms a weak acid. Air pollution means that water vapor absorbs more of these gases and becomes even more acidic.
Explanation:
PLEASE SOMEONE HELP ME WITH THIS!!!!!!
NO NEED FOR EXPLANATION JUST GIVE ME THE ANSWER
Calculate the heat in kJ required to change 10.0 g of water at 20.0°C into steam at 120.0°C. The specific heat of ice, water and steam is 2.108 J/g*°C, 4.18 J/g*°C, 2.010 J/g*°C respectively. Hf for H2O = 334 J/g, Hv for H2O = 2260 J/g.
Answer:
153.7kJ
Hope this helps :)
csbr has a crystal structure where each br- ion (blue) is surrounded by 8 cs ions (green). derive the minimum r/r (or rc/ra) ratio required for stability for the general case of cn
CsBr has a crystal structure where each [tex]Br^{-}[/tex] ion (blue) is surrounded by 8 [tex]Cs^{+}[/tex] ions (green). derive the minimum r/r (or rc/ra) ratio required for stability for the general case of CN 8 is 0.414.
Tetrahedral and octahedral holes will have different diameters if an assortment of anions are present in the form of cubic tight packing. As a result, the cations will only fill the holes if there is enough room for them to do so. Radius Ratio can be used to make a forecast about whether the ions will be able to hold the cations.
Many cations and anions can be found in ionic crystals. We are aware that anions are bigger than cations and surround them. They are positioned in space so that anions and cations are in contact with one another, creating the greatest stability.
On the basis of the radius ratio, this stability of the ionic crystals can be justified. As a result, the ratio of cation equals the radius ratio.
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Attenda
Young green sea turtles often eat jellyfish. After the
sea turtle swallows this jellyfish, the sea turtle's
esophagus will move the jellyfish into the stomach.
Which statements about the stomach are true? Select all that apply.
Most nutrient particles are absorbed by tiny blood vessels in the stomach.
The stomach can store partially digested food.
After food leaves the stomach, it enters the small intestine.
The stomach produces digestive chemicals that break down food.
Explanation:
after the food leaves the stomach it enters the small intestine
Answer:
after the food leaves the stomach it enters the small intestine
Explanation: