Answers
This problem is describing the equilibrium whereby hydrofluoric acid decomposes to hydrogen and fluorine gases at 298 K whose equilibrium constant is 8.70x10⁻³, the equilibrium concentrations of all the reactants are both 1.33x10⁻³ M and asks for the initial concentration of hydrofluoric acid which turns out to be 2.86x10⁻³ M.
Then, we can write the following equilibrium expression for hydrofluoric acid once the change, \(x\), has taken place:
\([HF]=[HF]_0-2x\)
Now, since both products are 1.33x10⁻³ M we infer the reaction extent is also 1.33x10⁻³ M, and thus, we can calculate the equilibrium concentration of HF via the law of mass action (equilibrium expression):
\(8.70x10^{-3}=\frac{(1.33x10^{-3} M)^2}{[HF]} }\)
\([HF]=\frac{(1.33x10^{-3} M)^2}{8.70x10^{-3}} }=2.03x10^{-4}M\)
Finally, the initial concentration of HF is calculated as follows:
\([HF]_0=[HF]+2x=2.033x10^{-4}+2*(1.33x10^{-3})=2.86x10^{-3}M\)
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How many atoms are in 12 g of Carbon-12 (12C)?
Answers
There are approximately 6.022 × 10^23 atoms in 12 grams of Carbon-12 (12C).
The number of atoms in a given amount of a substance can be calculated using Avogadro's number, which represents the number of atoms or molecules in one mole of a substance. Avogadro's number is approximately 6.022 × 10^23.
Carbon-12 is a specific isotope of carbon, with an atomic mass of 12 atomic mass units (amu). One mole of Carbon-12 has a mass of 12 grams. Since one mole of any substance contains Avogadro's number of particles, in the case of Carbon-12, it contains 6.022 × 10^23 atoms.
Therefore, if we have 12 grams of Carbon-12, which is equal to one mole, we can conclude that there are approximately 6.022 × 10^23 atoms in this amount of Carbon-12.
In summary, 12 grams of Carbon-12 contains approximately 6.022 × 10^23 atoms. Avogadro's number allows us to relate the mass of a substance to the number of atoms or molecules it contains, providing a fundamental concept in chemistry and enabling us to quantify and understand the microscopic world of atoms and molecules.
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which can be found on the periodic table: elements, compoumds or mixtures? pleaae help!!!!!!!!
Answers
Answer:
Elements
Explanation:
A compound: contains atoms of different elements chemically combined together in a fixed ratio.
A mixture: contain different elements and compounds but the ratio is not fixed nor are they combined via chemical bonds.
Answer:
elements can be found on a periodic table
what is the effect of temperature and pressure on crystal structure ?
ty! :)
Answers
Answer:
Increase of pressure increases the coordination number during crystallization e.g. by applying pressure the NaCl type crystal structure having 6:6 coordination number changes to CsCl type crystal having coordination number 8:8.
welc!! you Σ=)
Look at the diagram of a fuel cell below.
Which parts of the fuel cell do A and B represent?
A. air
B. anode and cathode
C. electrolyte
D. hydrogen and nitrogen
Answers
1. A
a stiff structure that surrounds and
protects a coll: found in plant, fungus, and some bacteria cells.
2.
is living things consisting of many cells.
3.
a green pigment that traps energy
from the sun.
the process in which plants and
some other organisms use the energy in sunlight to make food.
5. A
found in the nucleus of a cell,
a long nucleic acid molecule containing the genetic instructions
for the development and functioning of all living organisms.
Answers
Answer:
1 cell wall
2 yes
3 chloroplast
4 photosynthesis
5 Deoxyribonucleic acid (I believe)
hope this helped a little and pls mark brainiest if it did :)
Explanation:
The cell wall is a rigid layer that is found outside the cell membrane and surrounds the cell, providing structural support and protection.
17. Elements in the periodic table are arranged according to their.
Answers
Which sample (10.0 g of water or 10.0 g of ethanol) would require more heat to raise the temperature by 10.0°C?
Answers
10.0 g of ethanol would require more heat to raise the temperature by 10.0°C Because it has a higher boiling point.
The boiling point of a liquid is the temperature at which the vapour pressure of the liquid becomes equal to the atmospheric pressure of the liquid’s environment. At this temperature, the liquid is converted into a vapour.
The normal boiling point is high for liquids with strong intermolecular attractions and low for liquids with weak intermolecular attractions.
10.0 g of ethanol would require more heat to raise the temperature by 10.0°C because it has a higher boiling point.
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What does a weather map use to represent areas of high air pressure?
An "A"
An "H"
An "L"
A "P"
Answers
Answer:
H
Explanation:
is silver malleable because the valence electrons are strongly attracted to the nucleus
Answers
MATH AND SCIENCE
Out of around 260,000 known species of angiosperms, approximately 195,000 are dicots. what percentage of angio sperms are dicots
Answers
Answer:
Explanation:
Formula
% = (dicots/angiosperms) * 100
Givens
angiosperms (total) = 260000
Dicots = 195000
Solution
% = (195000/260000) * 100
% = 0.75 * 100
Answer: % = 75% are dicots
What is an example of a nonrenewable resource? (2 points)
a
Oil
b
Sunlight
c
Water
d
Wind
Answers
The answer is A: Oil.
Answer:
Explanation:
A. Oil
hope it helps!
Three identical flasks contain three different gases at standard temperature and pressure. Flask A contains CH4, flask B contains CO2, flask C contains N2. Which flask contains the largest number of molecules?
Answers
Answer:
FLASK B WHICH CONTAINS CO2 HAS THE HIGHEST NUMBER OF MOLECULES AS IT CONTAINS THE HIGHEST MOLECULAR MASS OF 44 G/MOL.
Explanation:
Flask A contains CH4
Flask B contaims CO2
Flask C contains N2
To know the flask containing the largest number of molecules, we find the molar mass of the molecules in the flask and the largest is the one with the highest number of the relative molecular mass.
Molecular Mass of CH4 (C = 12, H =1) = ( 12 + 1*4) g/mol
= 16 g/mol
Molecular mass of CO2 (C= 12, 0= 16) = (12 + 16*2) g/mol
= 12 + 32 g/mol
= 44 g/mol
Molecular mass of N2 (N=14) = 14 * 2 g/mol
= 28 g/mol
Hence, the flask with the largest number of molecules is the flask with the highest relative molecular mass. The highest molecular mass is 44 g/mol and it is for the gas CO2 in Flask B.
So therefore, Flask B has the highest number of molecules in it.
Calculate the cell potential for the galvanic cell in which the given reaction occurs at 25 °C, given that [Sn2+]=0.0624 M, [Fe3+]=0.0437 M, [Sn4+]=0.00655 M, and [Fe2+]=0.01139 M. Standard reduction potentials can be found in this table.
Sn2+(aq)+2Fe3+(aq)↽−−⇀ Sn4+(aq)+2Fe2+(aq)
So far my incorrect answers have been:
0.28
0.798
0.178
0.142
0.881
0.61
and 0.812
Answers
Answer:
The cell potential for the given galvanic cell is 0.188 V.
Explanation:
To calculate the cell potential, we can use the Nernst equation:
Ecell = E°cell - (RT/nF)ln(Q)
where E°cell is the standard cell potential, R is the gas constant (8.314 J/mol·K), T is the temperature in Kelvin (25°C = 298 K), n is the number of moles of electrons transferred (in this case, n = 2), F is the Faraday constant (96,485 C/mol), and Q is the reaction quotient.
First, we need to write the half-reactions and their standard reduction potentials:
Sn4+(aq) + 2e- → Sn2+(aq) E°red = 0.15 V
Fe3+(aq) + e- → Fe2+(aq) E°red = 0.77 V
The overall reaction is the sum of the half-reactions:
Sn2+(aq) + 2Fe3+(aq) → Sn4+(aq) + 2Fe2+(aq)
The reaction quotient Q can be expressed as:
Q = [Sn4+][Fe2+]^2 / [Sn2+][Fe3+]^2
Substituting the given concentrations, we get:
Q = (0.00655)(0.01139)^2 / (0.0624)(0.0437)^2 = 0.209
Now we can calculate the cell potential:
Ecell = 0.15 V + 0.0592 V log([Fe2+]^2/[Fe3+]) + 0.0592 V log([Sn4+]/[Sn2+])
= 0.15 V + 0.0592 V log(0.01139^2/0.0437^2) + 0.0592 V log(0.00655/0.0624)
= 0.188 V
Therefore, the cell potential for the given galvanic cell is 0.188 V.
The cell potential for the given galvanic cell in which the given reaction occurs at 25 °C is 0.188 V.
How to the cell potential of galvanic cell?To find the cell potential, we take the Nernst equation:
Ecell = E°cell - (RT/nF)ln(Q)
In which R is the gas constant (8.314 J/mol·K) and E° cell is the standard cell potential.
T temperature in Kelvin (25°C = 298 K), and n is the number of moles of electrons transferred (n = 2), Q is the reaction quotient and F is the Faraday constant (96,485 C/mol).
Firstly, write the half-reactions and then their standard reduction potentials:
Sn⁴⁺(aq) + 2e⁻ → Sn²⁺(aq) E°red = 0.15 V
Fe³⁺(aq) + e⁻ → Fe²⁺(aq) E°red = 0.77 V
The overall reaction is the sum of the half-reactions:
Sn²⁺(aq) + 2Fe³⁺(aq) → Sn⁴⁺(aq) + 2Fe²⁺(aq)
The Q reaction quotient can be written as:
Q = [Sn⁴⁺][Fe²⁺]² ÷ [Sn²⁺][Fe²⁺]²
Substituting the given concentrations, we observe:
Q = (0.00655)(0.01139)² ÷ (0.0624)(0.0437)² = 0.209
Next, we can find the cell potential:
Ecell = 0.15 V + 0.0592 V log([Fe²⁺]²/[Fe³⁺]) + 0.0592 V log([Sn⁴⁺]/[Sn²⁺])
= 0.15 V + 0.0592 V log(0.01139²÷0.0437²) + 0.0592 V log(0.00655÷0.0624)
= 0.188 V
Thus, the cell potential for the given galvanic cell is 0.188 V.
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6. How many moles are in 8.30 x 1023 molecules of CO₂?
a.
b.
C.
d.
1.37
2.8
55.5
100
Answers
Which of these waves has the greatest wavelength? (3 points) Wave shown with 2 wavelengths. Wave shown with 3 wavelengths. Wave shown with 1 wavelength stretch over a short distance. Wavelength shown with 1 wavelength stretched over a long distance.
Answers
The waves that has the greatest wavelength is Wavelength shown with 1 wavelength stretched over a long distance.
Waves explained.A wave could be a disturbance or variety that voyages through a medium or space, carrying vitality without transporting matter. Waves can take different shapes and happen totally different sorts of waves, counting mechanical waves and electromagnetic waves.
Mechanical waves require a medium to propagate, meaning they require a substance like water, discuss, or a strong fabric to transmit the wave. Illustrations of mechanical waves incorporate water waves, sound waves, and seismic waves. In these waves, particles of the medium sway or vibrate in a design, exchanging energy from one molecule to another.
Electromagnetic waves, on the other hand, don't require a medium and can travel through vacuum, such as in space. Electromagnetic waves comprise of electric and attractive areas swaying opposite to each other and to the heading of wave engendering. Illustrations of electromagnetic waves incorporate obvious light, radio waves, microwaves, infrared waves, bright waves, X-rays, and gamma beams.
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How many electrons are in chlorine-35
Answers
Explanation:
Chlorine-35 is an element with an atomic number of 17. The atomic number is equal to the number of protons and electrons for a neutral atom. However, 35 Cl− has a negative 1 charge which means that there are more than 1 electron compared to the number of protons. Hence, there are 18 electrons in the ion.
An airplane flies due east from an airport.
How could the airplane provide evidence that the shape of Earth is a sphere?
Select the words from the drop-down menus to complete the explanation.
By continuing to fly east, and with enough fuel, the airplane will eventually reach the
. The longest eastward journey would occur from an airport
. Very short journeys would occur
Answers
The fact that an airplane flying due east from an airport will eventually return to its starting point indicates that the Earth is a sphere due to the curvature of the Earth's surface.
How can an airplane flying due east provide evidence for the shape of the Earth?
By continuing to fly east, and with enough fuel, the airplane will eventually reach the same airport it started from. The longest eastward journey would occur from an airport located at one of the Earth's poles. Very short journeys would occur near the equator.
The fact that the airplane returns to its starting point indicates that the Earth is a sphere, as it would not be possible on a flat plane. This phenomenon is due to the curvature of the Earth's surface, which causes the plane's trajectory to follow a circular path along the Earth's surface.
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Polar water molecules can surround ions, reducing the likelihood of them interacting with other ions. What property of water does this phenomenon cause?
Answers
The property of water that causes polar water molecules to surround ions, reducing the likelihood of them interacting with other ions, is known as its solvation or hydration ability.
This solvation property is a result of water's high polarity, which arises from its asymmetrical molecular structure and the presence of polar covalent bonds. Water molecules have a partially positive (+) and partially negative (-) end due to the electronegativity difference between oxygen and hydrogen atoms. This polarity enables water molecules to form hydrogen bonds with other water molecules and with polar solutes, such as ions. When ions dissolve in water, the partially positive hydrogen atoms of water molecules are attracted to the negatively charged ions, and the partially negative oxygen atoms of water molecules are attracted to the positively charged ions.
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Give and proidi the following after and undergoing alpha decay and beta decay
Answers
The products of the alpha decay of radium-226 and the beta decay of carbon-14 are radon-222 and nitrogen-14, respectively.
The alpha decay of radium-226 results in the emission of an alpha particle, which is a helium nucleus consisting of two protons and two neutrons.
Therefore, the product of the alpha decay of radium-226 is radon-222:
Ra-226 → Rn-222 + alpha particle
On the other hand, In the case of carbon-14, beta minus decay occurs, in which a neutron is converted into a proton, and an electron and an antineutrino are emitted.
So carbon-14 becomes nitrogen-14:
C-14 → N-14 + beta particle
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--The complete Question is, What is the product of the alpha decay of radium-226 and the beta decay of carbon-14?--
Bromine has two isotopes, Br79 and Br81. The isotopes occur in a 50:50 (1:1) ratio. Given that the mass spectrum of bromine contains peaks for both bromine atoms and diatomic bromine molecules, predict the number of peaks in the spectrum. What would be the relative height of the atomic peaks
Answers
Answer:
There will be 3 peaks.
Relative height of the atomic peaks would be; 158, 160 and 162
Explanation:
We are told that Bromine has two isotopes namely 79Br and 81Br in a 1 : 1 ratio (50 : 50).
This means that a compound which contains 1 bromine atom will have two peaks in the molecular ion region but it depends on which bromine isotope is contained in the molecular ion.
Thus;
Relative height of atomic peaks is given by;
m/z = 79Br¯ 79Br+ = 158
79Br¯ 81Br+ = 160
81Br¯ 81Br+ = 162
Oxygen gas is made up of diatomic non-polar covalent molecules. This leads to very weak attraction between molecules. Which statement would this best support?
Answers
The oxygen gas is non polar because there is no interaction between the molecules of the gas.
What is a diatomic molecule?A diatomic molecule is one that has only two atoms in it. These atoms are usually atoms of the same element in the majority of the cases that we encounter. Given the fact that the both atoms belong to the same substance, the electronegativity difference between the atoms is zero.
Given that the electronegativity difference between the atoms is zero, there is little or no interaction between the molecules of the substance. Thus the very weak intermolecular interaction is coming from the fact that there is no kind of interaction between the molecules.
Thus oxygen gas is covalent and the molecules do not interact with each other because the bond is nonpolar.
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Some of the water evaporated before its temperature reached 100 degrees. Explain how this affected the student's value for the specific latent heat of vaporisation of water.
Answers
Answer:
The water was flying comfortably but it didnt change the alliance between the wind.
Explanation:
the awnsers can be gotten of your acore key
i just told the guy i like that I like him and he said he wants to get to know me better before making a decision. but now everything feels different. he's been really distant. what does that mean and how do I stop getting so attached?
Answers
Answer: you have to talk to someone who wont mind wanting to wanting to like you a lot like that.
Explanation: I wish I could be able to talk to someone who would want to get to like me like that, so its a very relatable situation.
\({ \red {\sf{Define \: Transportational}}}\)
2+x=19
Find x
Answers
Easy!!
2+17=19
#hope that helps
Answer:
To find the answer you may
2+17=19
Explanation:
so that is the answer I'm sorry,to not give all the solutions
Help please I’ll mark as brainiliest
Answers
Answer:
B B
W BW BW
W BW BW
Explanation:
Hope this helps
For the reaction 2KI+Pb(NO3)2⟶PbI2+2KNO3 how many grams of lead(II) iodide, PbI2, are produced from 81.1 g of potassium iodide, KI?
Answers
Taking into account the reaction stoichiometry, 112.61 grams of lead(II) iodide, PbI₂, are produced from 81.1 g of potassium iodide, KI.
Reaction stoichiometryIn first place, the balanced reaction is:
2 KI + Pb(NO₃)₂ → PbI₂+ 2 KNO₃
By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:
KI: 2 molesPb(NO₃)₂: 1 molePbI₂: 1 moleKNO₃: 2 molesThe molar mass of the compounds is:
KI: 166 g/molePb(NO₃)₂: 331.2 g/molePbI₂: 461 g/moleKNO₃: 101.1 g/moleThen, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:
KI: 2 moles ×166 g/mole= 332 gramsPb(NO₃)₂: 1 mole ×331.2 g/mole= 331.2 gramsPbI₂: 1 mole ×461 g/mole= 461 gramsKNO₃: 2 moles ×101.1 g/mole= 202.2 gramsRule of threeRule of three is a way of solving problems of proportionality between three known values and an unknown value, establishing a relationship of proportionality between all of them.
That is, what is intended with it is to find the fourth term of a proportion knowing the other three.
If the relationship between the magnitudes is direct, the direct rule of three must be applied using the following formula, being a, b and c known data and x the variable to be calculated:
a ⇒ b
c ⇒ x
So: x= (c×b)÷a
Mass of PbI₂ formedThe following rule of three can be applied: if by reaction stoichiometry 332 grams of KI form 461 grams of PbI₂, 81.1 grams of KI form how much mass of PbI₂?
mass of PbI₂= (81.1 grams of KI× 461 grams of PbI₂)÷ 332 grams of KI
mass of PbI₂= 112.61 grams
Then, 112.61 grams of lead(II) iodide, PbI₂, are produced from 81.1 g of potassium iodide, KI.
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Fill a glass jar with water. Put the jar in a place where it will not be moved. Gently put 2 drops of food coloring into the water. Let the jar stand
overnight
Which statement explains why the color spreads through the water?
O A Particles in a liquid are always moving.
B. Particles in a liquid never change places.
C. Particles all behave the same.
D. Particles can be seen in a liquid.
O E. Particles in a liquid don't move.
Answers
Answer:
A. Whatever is in the water, it moves. Even if a block is placed in there, it would move by sinking to the bottom. If a plastic bag was placed in there, it wouldn't sink but move a little.
Determine the volume (in mL) of 1.00 M NaOH that must be added to 250 mL of 0.50 M CH3CO₂H to produce a buffer with a pH of 4.50.
Answers
Approximately 70.57 mL of 1.00 M NaOH should be added to 250 mL of 0.50 M CH3CO₂H to produce a buffer with a pH of 4.50.
To determine the volume of 1.00 M NaOH required to produce a buffer with a pH of 4.50 when added to 250 mL of 0.50 M CH3CO₂H, we need to consider the Henderson-Hasselbalch equation and the stoichiometry of the reaction.
The Henderson-Hasselbalch equation for a buffer solution is given as:
pH = pKa + log([A-]/[HA])
In this case, CH3CO₂H (acetic acid) acts as the weak acid (HA) and CH3COO- (acetate ion) acts as its conjugate base (A-). We are given that the desired pH is 4.50, and we can determine the pKa value for acetic acid from reference sources, which is approximately 4.75.
Using the Henderson-Hasselbalch equation, we can rearrange it to solve for the ratio [A-]/[HA]:
[A-]/[HA] = 10^(pH - pKa)
[A-]/[HA] = 10^(4.50 - 4.75) = 10^(-0.25) = 0.5623
This means that the ratio of the acetate ion to acetic acid in the buffer solution should be approximately 0.5623.
To calculate the required volume of NaOH, we need to consider the stoichiometry of the reaction. Acetic acid reacts with hydroxide ions (OH-) to form acetate ions and water:
CH3CO₂H + OH- → CH3COO- + H2O
The stoichiometric ratio between acetic acid and hydroxide ions is 1:1. Therefore, the volume of 1.00 M NaOH needed can be calculated using the equation:
Volume (NaOH) × 1.00 M = Volume (CH3CO₂H) × 0.50 M × 0.5623
Volume (NaOH) = (Volume (CH3CO₂H) × 0.50 M × 0.5623) / 1.00 M
Volume (NaOH) = (250 mL × 0.50 M × 0.5623) / 1.00 M
Volume (NaOH) ≈ 70.57 mL
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A calibration curve was created to determine the quantity of protein in a solution. The calibration curve has the form of a straight line with the equation A = 0.0182 x +0.007 where A is the corrected absorbance of the solution and x is quantity of protein in the solution in units of micrograms (μg). Determine the quantity of protein in a solution that has an absorbance of 0.207. A blank solution has an absorbance of 0.050 .
Answers
Answer:
(a) 10 quantities of protein
(b) 2 quantities of protein
Explanation:
Given
\(A = 0.0182 x +0.007\)
Solving (a):
Solve for x when A = 0.207
Substitute 0.207 for A
\(A = 0.0182 x +0.007\)
\(0.207 = 0.0182x + 0.007\)
Solve for 0.0182x
\(0.0182x = 0.207 - 0.007\)
\(0.0182x = 0.200\)
Solve for x
\(x = 0.200/0.0182\)
\(x = 10.989010989\)
\(x = 11\) (Approximated)
Solving (b):
Solve for x when A = 0.050
Substitute 0.050 for A
\(A = 0.0182 x +0.007\)
\(0.050 = 0.0182x + 0.007\)
Solve for 0.0182x
\(0.0182x = 0.050 - 0.007\)
\(0.0182x = 0.043\)
Solve for x
\(x = 0.043/0.0182\)
\(x = 2.36263736264\)
\(x = 2\) (Approximated)
The illustration to the left represents a mixture of phosphorus ( orange ) and fluorine ( green ) molecules.
Answers
In the image we can see that there are 1 phosphorus (P4) molecules and 7 fluorine molecules.
According to the stoichiometry of the reaction, one molecule of phosphorus (P4) and 6 molecules of fluorine (F2) are needed to form 4 molecules of PF3.
The answer is:
The limiting reagent is phosphorus (P4)
The number pf PF3 molecules formed is 4 and
The number of fluorine atoms/molecules in excess is 1.