Option E) In the reaction A+ 2B-C that is found to be first order with respect to both a (0.200 m concentration and b (0.400 m concentration) the numeric value of k is 0.0875
What is Concentration?Concentration in chemistry terms is calculated by dividing a constituent's abundance by the mixture's present total volume.
Mass concentration, molar concentration, number concentration, and volume concentration are four different categories that can be described in a mathematical description.
A + 2B → C
Rate = K [A] [B]
Here,
[A] = 0.2 M [B]
⇒ [A] = 0.4 M
rate = 0.007 M/s
Therefore, rate = K [A] [B]
⇒ 0.007 = K (0.2) (0.4)
⇒ K = 0.0875 M^(-1) S^(-1)
Thus, option E is correct.
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Complete question
The reaction A+ 2B-C is found to be first order with respect to both A and B. When the concentration of A is 0.200 M and the concentration of B is 0.400 M, the reaction rate is 0.00700 M/s. What is the numerical value of k for this reaction (with appropriate units where time is in seconds and concentration is in M, as needed).
A) 0.0438
B) 0.0140
C) 11.4
D) 5.60 x 10^(-4)
E) 0.0875
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
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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A researcher wants to experiment with an element that reacts like sodium (na) but has a greater atomic mass. which element should the researcher select for the experiment?
Answer: iodine
Explanation:
Tough Tusion. 6. Consider the fission of uranium-235.
a. The fission of uranium-235 begins with the addition of a neutron to the nucleus. What isotope is formed? Give the isotope symbol.
b. After the neutron is added, the uranium atom is more unstable and undergoes fission. A possible set of products is krypton-94, barium-139, and 3 neutrons. How many protons are in these products?
c. Were any protons lost?
Uranium -236 (U-236) and the protons that are contained in the products are; krypton-36 and barium-56.
What is a fission reaction?The term fission refers to the process in which the nucleus of a larger element is bombarded with a small particle such as a neutron which causes the nucleus to become split. As the nucleus is split, smaller nuclei are able to be formed and this leads to the release of a tremendous amount of energy.
It should be known that fission reaction is one of the ways in which energy is released on a massive scale. While, it s true that fission reactions could be deployed on the negative scale such as in the production of the fission bombs, we should also know that it could be used positively to generate electricity in nuclear power plants.
The equation of the fission of uranium-235 begins with the addition of a neutron to the nucleus. What is then formed is uranium -236 (U-236). The protons that are contained in the products are; krypton-36 and barium-56.
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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
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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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:
calculate amount of tin and mass percentage
Amount of tin in the sample is 2.2837 gm and its mass percentage in the rock is 22.837%
I₃⁻ (aq) + Sn⁺² (aq) → Sn⁺⁴ (aq) + 3I⁻
1 mol 1 mol
mol of NaI₃ = 34.60 mL × 1 L / 1000 mL × 0.5560 mol / L
= 19.2376 × 10⁻³ mol
∵ 1 mol of Sn²⁺ = 1 mol of I₃⁻
∴ mol of Sn²⁺ = 19.2376 × 10⁻³
∴ mass of Sn in sample = mol of Sn²⁺ × molar mass
= ( 19.2376 × 10⁻³ mol ) × 118.71 gm/mol
= 2.28369 gm
= 2.2837 gm
∴ % of tin in sample = (mass of tin) / (mass of sample ) × 100
The mass percent of a solution is defined as the ratio of the mass of solute that is present in a solution, relative to the mass of the solution
= 2.2837/10 × 100
= 22.837 %
Thus we can conclude that amount of tin in the sample is 2.2837 gm and its mass percentage in the rock is 22.837%
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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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Phosphorous exists in many different solid forms. Two common forms of phosphorous are red and white phosphorous. Which new vocabulary term describes the fact that phosphorous exists in two or more forms?
The term is Allotropy
Which means that an element can exist in two or more forms with the same physical state but different structures
PLS HURRY WILL MARK BRAINLIEST
What two terms describe how new cells are made?
Answer: Mitosis & meiosis
Explanation:
Answer:
I think it is cell division and mitosis
Explanation:
I hope this is right sorry if it isnt
Complete the following word equations
Magnesium + water
Answer:
Magnesium reacts with hot water or water vapour to form Magnesium hydroxide and hydrogen gas.
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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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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Methane, ch4, is the gas commonly found in labs to fuel bunsen burners. A) how many moles of methane are there in a 7. 21 gram sample?
Using the molar mass of methane, there are 0.45 mole of methane in a 7.21 gram sample.
Molar mass is defined as the mass per unit mole of a substance.
MM = m/n
where MM = molar mass
m = mass
n = number of moles
The molar mass of methane is the sum of the molar masses of each element.
C : 12.011
H : 1.00784
CH4 : 12.011 + 4(1.00784) = 16.04236 g/mol
If a sample of methane has a mass of 7.21 grams, using the formula for the molar mass, solve for the number of moles.
MM = m/n
16.04236 g/mol = 7.21 g/n
n = 7.21 g/16.04236 g/mol
n = 0.4494351205 mol
n = 0.45 mol
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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:
Explain why one redwood tree has almost the same density as a whole forest of redwood trees.
The density of one redwood tree has almost the same density as a whole forest of redwood trees because density does not change with the shape, size, and mass of an object.
What is density?“Density is characterized as a mass of a unit volume of an object.”
d = m/v
Where m = mass and v = volume
It is expressed as gram per cubic centimeter.
Density is a property that does not depend upon the amount of substance present.
Thus, due to the fact that density is independent of an object's shape, size, and mass, one redwood tree has nearly the same density as an entire forest of them.
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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:
At 35°C, how many grams of NaNO3 will dissolve
in 100 grams of water?
35 grams
20 grams
37 grams
100 grams
Solubility (g of salt in 100 g H₂O)
888288 2 8 2 2
100
50
30
20
NaNO
Cach
Pb(NO₂)2
NaCl
FOND
KCI
KCIO
toofy
Ce₂(SO)
0 10 20 30 40 50 60 70 80 90 100
Temperature (°C)
100g of NaNO3 will dissolve in 100 grams of water
A homogeneous mixture of solutions of one or more solutes in a solvent. Adding sugar cubes to your tea or coffee is an example of a common solution. The ability of a sugar molecule to dissolve easily is called solubility. The term solubility can therefore be defined as the property of a substance (solute) to dissolve in a particular solvent. A solute is a substance that is either a solid, liquid, or gaseous solution in a solvent.
Here it is given that in 100g of water at temperature 35°C the amount of NaNO3 will dissolve is 100g we get it from the solubility curve
The graphical relationship between solubility and temperature is called the solubility curve. A solubility curve shows the change in solubility of a solid at different temperatures in a solvent. In the figure, temperature variation is plotted on the x-axis and solubility is plotted on the y-axis.
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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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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 :)
The graph below shows how solubility changes with temperature.
A graph with the horizontal axis showing temperature ranging from 0 to 10 in units of 10 and the vertical axis solubility in grams of salt per 100 grams of water. Several compounds are shown. All data are approximate. The substances and their coordinates are as follows: upper N a upper C l: 0, 38; 10, 38; 20, 38; 30, 38; 40, 39; 50, 39; 60, 39; 70, 40; 80, 40; 90, 40; 100, 40. Upper N a subscript 2 upper H upper A s upper O subscript 4: 0, 5; 10, 18; 20, 28; 30, 39; 40, 49; 60, 65; 80, 82. Upper B a (upper N upper O subscript 3) subscript 2: 0, 5; 10, 8; 30, 12; 40, 15; 50, 18; 60, 20; 80, 28; 100, 33. Upper N a subscript 2 upper S upper O subscript 4: 0, 5; 5, 8; 10, 10; 15, 15; 20, 20; 25, 20; 28, 35; 30, 40; 32, 49; 33, 50; 35, 50; 40, 48; 50, 47; 60, 46; 70, 45; 80, 43; 90, 32; 100, 40. Upper C 3 subscript 2 (upper S upper O subscript 4) subscript 3 dot 9 upper H subscript 2 upper O: 0, 18; 20, 10; 30, 8; 50, 5; 60, 3; 80, 1; 100, 0.
Which two solutions have similar solubilities at 40°C?
Na2SO4 and NaCl
Na2HAsO4 and NaCl
Na2HAsO4 and Na2SO4
Ba(NO3)2 and Ce2(SO4)3 • 9H2O
Depending on the solubility at the temperature, 600 mL of saturated solution in NaCl must be prepare. Na₂HAsO₄ and Na₂SO₄ is the correct option.
The maximum amount of a chemical that will dissolve in a given amount of solvent at a given temperature is referred to as its solubility. Varying compounds have very different solubilities, which is a characteristic of a particular solute-solvent pair. The amount of a solute that dissolves in a specific volume of liquid is known as its solubility.
In terms of solubility, solute volume divided by solvent volume o
Saturated, unsaturated, and extremely saturated solutions are all possible.
The solubility of solutes increases as the temperature rises.
Depending on the solubility at the temperature, 600 mL of saturated solution in NaCl must be prepared.
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Answer:
C
Explanation:
Na2HAsO4 and Na2SO4
photon has the frequency of 2.00 x 10^19 Hz, what is the energy and wavelength of this photon.
The energy and the wavelength of the photon would be 1.3252 ×10⁻¹⁴ Joules and 150 nanometers respectively.
What is the frequency?It can be defined as the number of cycles completed per second.It is represented in hertz and inversely proportional to the wavelength.
C=λν
λ = c / ν
Wavelength = 3×10⁸ / 2.00 x 10¹⁹
=1.5 x 10⁻¹¹
=150 nanometers
By using the Planck's energy formula,
E = hν
Where h is the Planck's constant with a value of 6.626×10⁻³⁴.
The energy of the Photon = 6.626×10⁻³⁴ ₓ 2.00x 10¹⁹
The energy of the Photon = 6.626×10⁻³⁴ ₓ 2.00 x 10¹⁹
=1.3252 ×10⁻¹⁴ Joules
Thus, the energy and the wavelength of the photon would be 1.3252 ×10⁻¹⁴ Joules and 150 nanometers respectively.
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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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Distinguish between haploid and diploid
When an organism's cells only have one set of chromosomes, the organism is said to be haploid. All organisms that reproduce sexually are diploid (having two sets of chromosomes, one from each parent). Only the egg and sperm cells in humans are haploid.
The term "diploid" describes an organism's cells having two full sets of chromosomes, with one chromosome from each parent present in each pair. Since humans are diploid, the majority of their cells have 23 pairs of chromosomes.
Distinguish between haploid and diploid.
The number of chromosome sets found in the nucleus is the most obvious distinction between haploid and diploid cells. In contrast to diploid cells, which have two sets of chromosomes, haploid cells only have one set.The result of mitotic cell division is the formation of diploid cells. Following meiotic cell division, haploid cells are produced.Since there are two sets of chromosomes, there are two times as many chromosomes overall as there are in haploid cells. In comparison to diploid cells, there are half as many chromosomes because there is only one set present.To know more about haploid and diploid, click on the link below:
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Which of the following sequences describes how a four-stroke engine cycle
powers the engine?
The four-stroke engine cycle is defined by the following steps air and fuel intake, compression and ignition, combustion and expansion, and exhaust.
The correct option is B.
What is four stroke engine cycle?A four-stroke engine cycle is a style of engine in which the piston ignites internal combustion.
The entire piston travel along the cylinder is referred to as a stroke in an engine. The order in which the processes in the engine occur is as follows:
Injection: During this procedure, the engine is injected with both air and fuel.Ignition: After the intake materials are crushed, they are ignited.Fuel is burned after being ignited, and expansion occurs once more as a result of the products that are produced during the combustion event.Exhaust: In this stage, a piston forces the engine's burned gases out of the system.To know more about Four stroke engine visit:
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The complete question is-
Which of the following sequences describes how a four-stroke engine cycle powers the engine?
A. Expansion, air and fuel intake, compression and ignition,
extinguishment
B. Air and fuel intake, compression and ignition, combustion and
expansion, exhaust
C. Hydrogen and fuel intake, expansion, compression and ignition,
exhaust
D. Contraction, compression and ignition, air and fuel intake, exhaust
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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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
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:
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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