Answer:
A. K = 59.5
Explanation:
Hello there!
In this case, since this reaction seems to start moving leftwards due to the fact that neither A nor Y are present at equilibrium, we should rewrite the equation:
3C (g) + D (g) <-- --> 2A (g) + Y (g)
Thus, the equilibrium expression is:
[tex]K^{left}=\frac{[A]^2[Y]}{[C]^3[D]}[/tex]
Next, according to an ICE table for this reaction, we find that:
[tex][A]=2x[/tex]
[tex][Y]=x[/tex]
[tex][C]=0.651M-3x[/tex]
[tex][D]=0.754M-x[/tex]
Whereas x is calculated by knowing that the [C] at equilibrium is 0.456M; thus:
[tex]x=\frac{0.651-0.456}{3} =0.065M[/tex]
Next, we compute the rest of the concentrations:
[tex][A]=2(0.065M)=0.13M[/tex]
[tex][Y]=0.065M[/tex]
[tex][D]=0.754M-0.065M=0.689M[/tex]
Thus, the equilibrium constant for the leftwards reaction is:
[tex]K^{left}=\frac{(0.13M)^2(0.065M)}{(0.456M)^3(0.689M)}=0.0168[/tex]
Nonetheless, we need the equilibrium reaction for the rightwards reaction; thus, we take the inverse to get:
[tex]K^{right}=\frac{1}{0.0168}=59.5[/tex]
Therefore, the answer would be A. K = 59.5.
Regards!
25 g of a chemical is dissolved in 75 g of water. What is the percent by mass concentration of this chemical
Answer:
300
Explanation:
Deep water currents are formed partly due to the amount of _________________ in the water.
Answer:
Density differences
Explanation:
The water transports cool masses of air and hot air, the transports is driven by the amount of changes of Temperature and Salinity (ThermoHaline)
How much energy is required to raise the temperature of 10.6 grams of gaseous neon from
20.0 °C to 37.9 °C ?
Answer:
Approximately [tex]1.95 \times 10^{2}\; \rm J[/tex].
Explanation:
Look up the specific heat of gaseous neon:
[tex]c = 1.03 \; \rm J \cdot g^{-1} \cdot K^{-1}[/tex].
Calculate the required temperature change:
[tex]\Delta T = (37.9 - 20.0)\; \rm K = 17.9\; \rm K[/tex].
Let [tex]m[/tex] denote the mass of a sample of specific heat [tex]C[/tex]. Energy required to raise the temperature of this sample by [tex]\Delta T[/tex]:
[tex]Q = c \cdot m \cdot \Delta T[/tex].
For the neon gas in this question:
[tex]c = 1.03\; \rm J \cdot g^{-1}\cdot K^{-1}[/tex].[tex]m = 10.6\; \rm g[/tex].[tex]\Delta T = (37.9 - 20.0)\; \rm K = 17.9\; \rm K[/tex].Calculate the energy associated with this temperature change:
[tex]\begin{aligned}Q &= c \cdot m \cdot \Delta T \\ &= 1.03\; \rm J \cdot g^{-1}\cdot K^{-1} \times 10.6\; \rm g \times 17.9\; \rm K \\ &\approx 1.95 \times 10^{2}\; \rm J\end{aligned}[/tex].
A plastic material has a mass of 3.48 g and a volume of 10 mL.
What is the density of the object?
Please show your work to receive credit.
how many types of hybridization does carbon undergo?
Answer:
For carbon the most important forms of hybridization are the sp2- and sp3- hybridization. Besides these structures there are more possiblities to mix dif- ferent molecular orbitals to a hybrid orbital. An important one is the sp- hybridization, where one s- and one p-orbital are mixed together.
What volume will the gas in the balloon with 4.3 L of gas at 350K occupy at 250K?
Answer:
Explanation:
300
5
How many J of energy are needed to raise the temperature of 18.3 g of
water from 11.88°C to 49.32°C?*
2540 J
1740 J
2870 J
3570 J
Q = mcΔT, where Q is the heat energy, m is the mass, c is the specific heat, and ΔT is the change in temperature (T₂-T₁). The specific heat of water is 4.184 J/g °C. We are given the mass of water (m = 18.3 g), the final temperature (T₂ = 49.32 °C), and the initial temperature (T₁ = 11.88 °C). The change in temperature, ΔT, equals 49.32 °C - 11.88 °C = 37.44 °C. With all these values at hand, we can solve for the amount of energy needed, Q:
Q = (18.3 g)(4.184 J/g °C)(37.44 °C) = 2866.7 J ≈ 2870 J (three sig figs).
This compound, (C10H12O3), shows strong, sharp absorption between 1700 and 1720 cm-1, and strong, broad absorption over the region 2500-3000 cm-1. Given this information and the following NMR data, please draw the structure of the compound in the box below.
1H-NMR: 2.49 ppm, t(2H); 2.80 ppm, t(2H); 3.72 ppm, s(3H); 6.78 ppm, d(2H); 7.11 ppm, d(2H); 12.4, s(1H) 13C-NMR: 173.89; 157.87; 132.62; 128.99; 113.55; 54.84; 35.75; 29.20
Answer:
Explanation:
The peak at 1700-17200 cm⁻¹ in the infrared spectrum shows the existence of a carbonyl group (C=O). The appearance of an OH peak is shown by the broad peak at 2500-3000 cm⁻¹. The peak at 12.4 ppm in 1H NMR identifies the existence of carboxylic acid. The peaks at 6.78 ppm and 7.11 ppm suggest that the prevalence existence of a benzene ring in the molecule. Because these peaks are doublets, the benzene is being para-substituted.
The existence of the CH2 group is shown by the peak at 2.49 ppm, which integrates 2 hydrogens. Provided that the breaks are doublets, It would be bound to another CH2 molecule as well as carbon that is devoid of hydrogen (benzene carbon).
The existence of the CH2 group, which is linked to the above-listed CH2 group, is also demonstrated by the next peak at 2.8 ppm. It must be bonded with carbonyl carbon so it breaks as a doublet. As a result, it has a greater chemical transition. The CH3 category is shown by the peak at 3.72 ppm. Its chemical change is strong, indicating that CH3 is linked to an oxygen atom that is linked to benzene.
NMR details at 13C. Carbonyl carbon of acid has a high (peak) at 173.89 ppm. Benzene carbon peaks range from 113.55 to 157.87 ppm. The peak at 64 is made up of CH3, while the other two are made up of CH2.
The structure of the diagram is shown below with its degree of unsaturation.
Given Fe(OH)3 + Na Br react in a double displacement, what is/are the formulas of the product/s?
Answer:
FeBr₃ and NaOH
Explanation:
In a double displacement reaction, the ionic species of both reactants are exchanged between each other, as follows:
Fe(OH)₃ + 3NaBr → FeBr₃ + 3NaOHThat way the cation Fe⁺³ (originally bonded to OH⁻) is bonded to the anion Br⁻ instead, while Na⁺ bonds to OH⁻ (instead of Br⁻).
How might the population of owls be affected if the population of grasshoppers were to suddenly decrease
Answer:
The population of grasshoppers would increase becuase there arent as many owls to hunt?feed on them.
Explanation:
Hope this helps
a sample of 0.0084 mol of HCl is dissolved in water to make a 1500 mL solution. calculate the molar it’s of the HCl solution, The H3O, and the pH
Answer:
pH = 2.25
Explanation:
pH is a measurement in chemistry defined as the -log [H₃O⁺]. Molarity [], is defined as the ratio between moles of solute (HCl) and the liters of solution
To solve this question we must find the molarity of the H₃O⁺ knowing: [HCl] = [H₃O⁺]
[HCl]:
0.0084moles / 1.500L
= 0.0056M = [HCl] = [H₃O⁺]
pH = -log [H₃O⁺] = -log [0.0056M]
pH = 2.25A solution prepared by dissolving 0.0084 moles of HCl in 1500 mL of solution has a molar concentration of HCl of 5.6 × 10⁻³ M, a molar concentration of H₃O⁺ of 5.6 × 10⁻³ M and a pH of 2.3.
A solution is prepared by dissolving 0.0084 moles of HCl in 1500 mL of solution. The molarity of HCl is:
[tex][HCl] = \frac{0.0084mol}{1.5L} = 5.6 \times 10^{-3} M[/tex]
HCl is a strong acid according to the following equation.
HCl(aq) + H₂O(l) ⇒ Cl⁻(aq) + H₃O⁺(aq)
Thus, the concentration of H₃O⁺ will be equal to the initial concentration of HCl, 5.6 × 10⁻³ M.
Finally, we will calculate the pH of the solution using its definition.
[tex]pH = -log [H_3O^{+} ] = -log (5.6 \times 10^{-3} ) = 2.3[/tex]
A solution prepared by dissolving 0.0084 moles of HCl in 1500 mL of solution has a molar concentration of HCl of 5.6 × 10⁻³ M, a molar concentration of H₃O⁺ of 5.6 × 10⁻³ M and a pH of 2.3.
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explain the importance of changing states of matter
As a result, when a substance absorbs enough energy then its atoms or molecules move around. And, when increase in this energy takes place then atoms tend to collide frequently with each other. Hence, it causes change in state of a substance. Therefore, changes in matter are important for the conservation of energy
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Use the information to answer the following question.
A machinist creates a solid steel part for a wind turbine. The part has a volume of 1,015 cubic centimeters. Steel can be purchased for $0.29 per kilogram and has a density of 7.95 g/cm3.
If the machinist makes 500 of these parts, what is the total cost of the steel?
A.
$2.34
B.
$1,152.75
C.
$2,340.08
D.
$1,170.84
Answer: D
Explanation:
A solution has a pH of 9.5. Is the solution an acid or a base?
Answer:
The solution is Basic
Plate tectonics is helpful in explaining many things we observe on Earth. Which of the following is the best example of something that results from tectonic plate movement?
Answer: Seafloor spreading causes changes in coastlines
The phenomenon that causes air masses and water to bend or curve is the ______________.
PLZ I NEED HELP ILL GIVE BRAINLIEST
Answer:
The Coriolis effect
Explanation:
The Coriolis effect is the effect that makes tornados, water spouts, and are often seen in storms. They make water curve and rotate as well as the wind And current.
What subatomic particle is not considered when calculating atomic
mass?
electrons
protons
neutrons
Answer:
Electrons are not considered.
Explanation:
An electron's mass is around 9.1 * 10^-31 kg, whereas the mass of protons and neutrons is around 1.7 * 10^-27 kg. Since electrons are about 1000x smaller than protons and neutrons, they are not considered to contribute significantly to the atomic mass.
A chemist must prepare 0.200 L of aqueous silver nitrate working solution. He'll do this by pouring out some aqueous silver nitrate stock solution into a graduated cylinder and diluting it with distilled water. Calculate the volume in of the silver nitrate stock solution that the chemist should pour out. Be sure your answer has the correct number of significant digits.
A chemist must prepare 0.200 L of 1.00 M aqueous silver nitrate working solution. He'll do this by pouring out 1.82 mol/L aqueous silver nitrate stock solution into a graduated cylinder and diluting it with distilled water. How many mL of the silver nitrate stock solution should the chemist pour out?
Answer: 0.110 L
Explanation:
According to the dilution law,
[tex]M_1V_1=M_2V_2[/tex]
where,
[tex]M_1[/tex] = molarity of stock silver nitrate solution = 1.82 M
[tex]V_1[/tex] = volume of stock silver nitrate solution = ?
[tex]M_1[/tex] = molarity of diluted silver nitrate solution = 1.00 M
[tex]V_1[/tex] = volume of diluted silver nitrate solution = 0.200 L
Putting in the values we get:
[tex]1.82M\times V_1=1.00M\times 0.200L[/tex]
[tex]V_1=0.110L[/tex]
Therefore, volume of silver nitrate stock solution required is 0.110 L
What does a catalyst do when added to a chemical reaction? Select all that apply.
Question 3 options:
It lowers the activation energy.
It increases the activation energy.
It speeds up chemical reactions.
It gets consumed in the reaction.
Answer:
It increases the activation energy.
It speeds up chemical reactions.
Explanation:
Answer:
[tex]\boxed {\boxed {\sf It \ lowers \ the \ activation \ energy \ and \ it \ speeds \ up \ chemical \ reactions }}[/tex]
Explanation:
A catalyst is a substance that increases the rate of a chemical reaction. Some examples are enzymes and acid-base catalysts.
They can do this by lowering activation energy (the energy needed to undergo a reaction) or modifying a certain mechanism in the reaction.
Catalysts are unique because they aren't consumed or used up in a reaction. They can be reused many times.
So, based on the information above, catalysts do not increase the activation energy or get consumed in the reaction. That leaves two correct answers: they lower the activation energy and speed up chemical reactions.
A 38.2g sample of hydrogen gas, H, is placed into a 2-L soda bottle. IfI keep the pressure and
temperature constant, how large would my container need to be if I increased hydrogen's mass to 50.0-g?
Answer:
[tex]V_2=2.62L[/tex]
Explanation:
Hello there!
In this case, according to the given problem, it is possible for us to notice that the equation to be used is the Avogadro's one in terms of mass because this is applied to the same gas, hydrogen:
[tex]\frac{V_2}{m_2} =\frac{V_1}{m_1} \\\\[/tex]
Thus, by considering both the initial and final masses and the initial volume, we can compute the final volume as shown below:
[tex]V_2 =\frac{V_1m_2}{m_1} \\\\V_2=\frac{2L*50.0g}{38.2g} \\\\V_2=2.62L[/tex]
Best regards!
explain why we see the pattern between predator and prey
Answer:
The food chain starts as prey to a preditor and then when the preditor dies the prey eat the preditor
Explanation:
Just that
list any 5 non metals? plz
Answer:
hiiiiiiiiiíiiiiiiiiiii
A cold drink has been placed outside on a hot day. As time passes, the outside of the cup forms water droplets on it. What phase change has occurred?
A. Melting
B. Freezing
C. Condensing
D. Vaporizing
Answer:
the answer is c. condensing
What is the primary source of energy that helps form sediment?
Answer:
Sediment forms when any type of rock is weathered, a process driven by energy from the sun. Magma forms when any type of rock is melted, a process driven by energy from Earth's inter
Explanation:
I NEED HELP WITH THIS CHEMISTRY QUESTION PLS
Answer:
Iron, according to:
[tex]2Al(s)+3Fe(NO_3)_2(aq)\rightarrow 3Fe(s)+2Al(NO_3)_3(aq)[/tex]
Explanation:
Hi there!
In this case, according to the law of conservation of mass, which states that matter cannot be neither created nor destroyed, it is possible for us to figure out the missing element in the reaction by taking into account this is a single displacement reaction in which Al goes with NO3 to produce the Al(NO3)3, and therefore the other element would be iron (Fe) as can be seen on the following chemical reaction:
[tex]2Al(s)+3Fe(NO_3)_2(aq)\rightarrow 3Fe(s)+2Al(NO_3)_3(aq)[/tex]
Best regards!
Balance the following skeleton reaction in acidic solution (if the coefficient is 1, put 1; if the coefficient is 0, put O) and identify the oxidizing and reducing agents. For the oxidizing and reducing agent, enter numbers and +/- directly for superscripts and subscripts.
(eg. enter HCO3- for HCO3-, Cu2+ for Cu2+)
Cr2012-(aq) + Zn(s) — Zn2+(aq) + Cr3+(aq)
Cr20-2-(aq) + Zn(s) + H+(aq) +
H20(1) —> Zn2+(aq) + Cr3+(aq) +
H+(aq) + H2O(1) (acidic)
Oxidizing agent:
Reducing agent:
Answer:
jdjdjsjdjkxjejf
Explanation:
djdjsjsdkdkdk
Please help!!!!!!!!!!!!!!
Answer:
my guy we need to read lesson cuz int know what any of that mean
Explanation:
A solution which has more H+ ions than OH- ions will have a pH greater than 7.
A. True
B. False
Answer:
True
Explanation:
More the concentration of H⁺ ions than OH⁻ions the pH value will be less than 7. Therefore, the given statement is false.
What is pH?The pH of a solution can be described as the negative logarithm of hydrogen (H⁺) ion concentration. pH is mathematically inversely proportional to the concentration of hydrogen ions.
pH = - log ([H⁺])
In chemistry, pH is used to determine the acidity or basic strength of an aqueous solution. Acidic solutions are determined to have lower pH values than alkaline solutions.
The pH scale exhibits a range from 0 to 14 while pH 7.0 is neutral. A low pH value is acidic while a high pH means basic.
If the concentration of H⁺ ions than that of OH⁻ ions then the pH value of the solution will decrease and a low pH value of 7 indicates that the solution is acidic.
Learn more about pH value, here:
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what is the production of H2O2(aq) + 2H+(aq) + 2I–(aq)
Answer: math is gay
Explanation:
one drawback of x-ray scattering experinment.
Answer:
Rutherford passed beams of alpha particles through a thin gold foil to observe the atom and noted how the alpha particles scattered from the foil.
Observations of Rutherford's alpha ray scattering experiment:
1.Most of the α-particles passed straight through the gold foil without any deviation.
2. Some of the α-particles were deflected by the foil by some angles.
3.Interestingly one out of every 12,000 alpha particles appeared to rebound
Conclusion of Rutherford's scattering experiment:
1.Most of the space inside the atom is empty because most of the α-particles passed through the gold foil without getting deflected.
2. Very few particles were deflected from their path, indicating that the positive charge of the atom occupies very little space.
3. A very small fraction of α-particles were deflected by very large angles, indicating that all the positive charge and mass of the gold atom were concentrated in a very small volume within the atom.
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