Answers
Explanation:
In the case, the oxygen atoms have -2 oxidation number ,and sulpher +6, so (4x -2)+6=2 so the copper must be +2
Related Questions
Match each element with the element that is most similar to it. If you don't know the answer, use this periodic table e to
help you make your best guess.
Drag the tiles to the correct boxes to complete the pairs.
Tiles
silicon
sulfur
potassium
bromine
Pairs
lithium
carbon
fluorine
oxygen
Answers
Answer:
lithium - potassium
carbon - silicon
fluorine - bromine
oxygen - sulfur
I hope this helps!
grade 11 chemistry what happen when n hexane is heated at 600 degree celcius in pressure of a cr2O3 catalyst?
Answers
Answer:
For Example, When n-Hexane Is Passed Over Chromium Oxide (Cr2O3) Supported Over Alumina (Al2O3) at 600 degree Celsius, Benzene Is Produced
In the electrolysis of water, the 50 cm3 of a gas is obtained at the anode. a. Write the chemical equation. b. What is the gas obtained at the anode? c. What is the volume of gas obtained at the anode?
Answers
a. The chemical equation for the electrolysis of water is:
2H2O(l) → 2H2(g) + O2(g)
b. The gas obtained at the anode during the electrolysis of water is oxygen (O2).
c. The volume of gas obtained at the anode is 0.002232 moles or approximately 0.05 L of oxygen gas.
a. The chemical equation for the electrolysis of water is:
2H2O(l) → 2H2(g) + O2(g)
b. The gas obtained at the anode during the electrolysis of water is oxygen (O2).
c. According to the balanced chemical equation, for every 2 moles of water (H2O) electrolyzed, 1 mole of oxygen gas (O2) is obtained. Since 1 mole of any gas occupies 22.4 L at standard temperature and pressure (STP), we can use the stoichiometry of the reaction to determine the volume of oxygen gas produced.
Given that 50 cm³ of gas is obtained at the anode, we need to convert this volume to liters:
50 cm³ = 50/1000 L = 0.05 L
Using the stoichiometric ratio of the balanced equation, we find that 2 moles of water produce 1 mole of oxygen gas. Therefore, 0.05 L of oxygen gas is equivalent to:
0.05 L × (1 mole/22.4 L) = 0.002232 moles
Thus, the volume of gas obtained at the anode is 0.002232 moles or approximately 0.05 L of oxygen gas.
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5. Write the two resonance hybrids for the carbocation that would be formed by protonation at C-1 of 2-methyl-1,3-pentadiene. Without doing a calculation, would you expect C-2 or C-4 (the two end carbons of the allylic cation) to have the most positive charge on it
Answers
Answer:
Follows are the solution to this question:
Explanation:
Please find the complete solution in the attached file.
What is the final temperature after 840 Joules is absorbed by 10.0g of water at 25.0
C?
Answers
The final temperature of the water is: T_final = 45.0°C
We can use the formula for the specific heat capacity of the water to solve this problem:
q = mcΔT
First, we can calculate the initial energy of the water:
q = mcΔT
q = (10.0 g) (4.184 J/g°C) (25.0°C)
q = 1,046 J
Next, we can calculate the final temperature after absorbing 840 J:
q = mcΔT
840 J = (10.0 g) (4.184 J/g°C) (ΔT)
ΔT = 20.0°C
Therefore, the final temperature of the water is:
T_final = T_initial + ΔT
T_final = 25.0°C + 20.0°C
T_final = 45.0°C
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In the Fischer esterification reaction, a carboxylic acid reacts with an excess of alcohol in acidic conditions to form an ester. During the reaction the sp2sp2 hybridized carbonyl carbon of the acid forms an sp3sp3 hybridized intermediate before returning to sp2sp2 hybridization in the product. Draw the structure of the neutral sp3sp3 hybridized intermediate and the ester product in the reaction between pentanoic acid and n‑propanol.
Answers
Answer:
See explanation and image attached
Explanation:
Esterification is a reaction of an alkanol and an alkanoic acid to yield an ester and water as products. It is analogous to inorganic neutralization reaction.
The process may be acid catalyzed. As mentioned in the question, the process of ester formation between pentanoic acid and n‑propanol first involves the carbonyl in going through an sp3 hybridized intermediate before returning to sp2 hybridized state in the product.
The image of the neutral form of this intermediate as well as the final structure of the ester are both shown in the image attached to this answer.
At 25 ∘C
, the equilibrium partial pressures for the reaction
A(g)+2B(g)↽−−⇀C(g)+D(g)
were found to be A=5.63
atm, B=5.00
atm, C=5.47
atm, and D=5.63
atm.
What is the standard change in Gibbs free energy of this reaction at 25 ∘C
?
Answers
The standard change in Gibbs free energy of the reaction at 25 ∘C is -1.69 kJ/mol.
What is standard change?
To find the standard change in Gibbs free energy of the reaction, we need to use the following equation:
ΔG° = -RT ln(K)
where ΔG° is the standard change in Gibbs free energy, R is the gas constant (8.314 J/mol·K), T is the temperature in Kelvin (25 °C = 298 K), and K is the equilibrium constant.
To find K, we need to use the equilibrium partial pressures:
K = (PC × PD) / (PA × PB²)
where PA, PB, PC, and PD are the equilibrium partial pressures of A, B, C, and D, respectively.
Substituting the values, we get:
K = (5.47 atm × 5.63 atm) / (5.63 atm × (5.00 atm)²)
K = 0.6176
Now we can calculate the standard change in Gibbs free energy:
ΔG° = -RT ln(K)
ΔG° = -(8.314 J/mol·K) × (298 K) × ln(0.6176)
ΔG° = -1,690 J/mol or -1.69 kJ/mol
Therefore, the standard change in Gibbs free energy of the reaction at 25 ∘C is -1.69 kJ/mol.
What is free energy?
Free energy, also known as Gibbs free energy, is a thermodynamic quantity that represents the amount of energy in a system that is available to do work at a constant temperature and pressure. It is denoted by the symbol G and is expressed in units of joules (J) or calories (cal).
In simple terms, free energy is the energy that can be used to do work. It is defined by the equation:
ΔG = ΔH - TΔS
where ΔH is the change in enthalpy (heat content) of the system, ΔS is the change in entropy (disorder) of the system, and T is the absolute temperature in Kelvin.
If ΔG is negative, the reaction is spontaneous and can proceed without the input of external energy. If ΔG is positive, the reaction is non-spontaneous and requires energy input to proceed. If ΔG is zero, the system is at equilibrium.
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x^2/2x^5=2
how do you solve this ?
Answers
Answer:
\(x=\sqrt[3]{\frac{1}{4}}\)
Explanation:
\(\displaystyle\frac{x^2}{2x^5}=2\\\\x^2=4x^5\\\\1=4x^3\\\\x^3=\frac{1}{4}\\\\\\x=\sqrt[3]{\frac{1}{4}}\)
A student planned to make copper sulfate crystals from excess copper oxide and dilute sulfuric acid.
The equation for the reaction is:
CuO(s) + H,SO (aq) -, CuSO (aq) + H20(1)
This is the method used.
1. Add 25 cm° of dilute sulfuric acid to a conical flask.
2. Gently warm the dilute sulfuric acid.
3. Add excess copper oxide to the dilute sulfuric acid.
4. Stir the mixture.
5. Heat to evaporate all the water from the mixture.
Suggest two improvements to the method
Explain why each improvement is needed.
A student plans a method to prepare pure crystals of copper sulfate.
The student's method is:
1. Add one spatula of calcium carbonate to dilute hydrochloric acid in a beaker.
2. When the fizzing stops, heat the solution with a Bunsen burner until all the liquid is gone.
The method contains several errors and does not produce copper sulfate crystals.
Explain the improvements the student should make to the method so that pure crystals of copper sulfate are produced.
Answers
The student's method for preparing pure crystals of copper sulfate contains errors and does not produce the desired outcome.
Use copper oxide instead of calcium carbonate: The student should add copper oxide (CuO) to the hydrochloric acid instead of calcium carbonate. Copper oxide reacts with hydrochloric acid to form copper chloride, which can then be converted to copper sulfate through a subsequent reaction with sulfuric acid.
Add sulfuric acid to the copper chloride solution: After the copper chloride solution is formed, the student should add sulfuric acid to it. This reaction between copper chloride and sulfuric acid will yield copper sulfate and hydrochloric acid. The student should ensure that the correct stoichiometric ratio is maintained to maximize the yield of copper sulfate crystals.
Crystal formation: The student should allow the solution to cool slowly after the reaction with sulfuric acid. This promotes the formation of larger, well-defined copper sulfate crystals.
Filtration and drying: Once the crystals have formed, the student should filter the solution to separate the solid crystals from the remaining liquid. The filtered crystals should then be thoroughly dried to remove any remaining water, resulting in pure copper sulfate crystals.
By following these improvements, the student can obtain pure crystals of copper sulfate.
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explain how air pressure keeps a balloon infalted?
Answers
Answer:
Blowing up a balloon involves forcing additional air particles from your lungs into the balloon. These particles hit the inside walls of the balloon creating enough air pressure to force the rubber of the balloon to expand and the balloon to inflate.
Explanation: hopes it helps :)
2.
BaO + H2SO4 —> BaSO + H2O
A) How much BaSo4 can be formed from 196.0 g of H2SO4?
B) How many moles of H2O, are formed when 345.0 g of Bao are reacted with excess H2SO4?
Answers
Answer:
A. 466 g of BaSO₄.
B. 2.25 moles of H₂O.
Explanation:
The balanced equation for the reaction is given below:
BaO + H₂SO₄ —> BaSO₄ + H₂O
Next, we shall determine the mass of H₂SO₄ that reacted and the mass of BaSO₄ produced from the balanced equation. This can be obtained as follow:
Molar mass of H₂SO₄ = (2×1) + 32 + (16×4)
= 2 + 32 + 64
= 98 g/mol
Mass of H₂SO₄ from the balanced equation = 1 × 98 = 98 g
Molar mass of BaSO₄ = 137 + 32 + (16×4)
= 137 + 32 + 64
= 233 g/mol
Mass of BaSO₄ from the balanced equation = 1 × 233 = 233 g
SUMMARY:
From the balanced equation above,
98 g of H₂SO₄ reacted to produce 233 g of BaSO₄.
A. Determination of the mass of BaSO₄ produced by the reaction of 196 g of H₂SO₄.
From the balanced equation above,
98 g of H₂SO₄ reacted to produce 233 g of BaSO₄.
Therefore, 196 g of H₂SO₄ will react to produce = (196 × 233) /98 = 466 g of BaSO₄.
Thus, 466 g of BaSO₄ were obtained from the reaction.
B. Determination of the number of mole of H₂O produced by the reaction of 345 g of BaO.
We'll begin by calculating the number of mole in 345 g of BaO. This can be obtained as follow:
Mass of BaO = 345 g
Molar mass of BaO = 137 + 16 = 153 g/mol
Mole of BaO =?
Mole = mass /Molar mass
Mole of BaO = 345 / 153
Mole of BaO = 2.25 moles
Finally, we shall determine the number of mole of H₂O produced from the reaction. This can be obtained as follow:
BaO + H₂SO₄ —> BaSO₄ + H₂O
From the balanced equation above,
1 mole of BaO reacted to produce 1 mole of H₂O.
Therefore, 2.25 moles of BaO will also react to produce 2.25 moles of H₂O.
Thus, 2.25 moles of H₂O were obtained from the reaction.
Calculate the mass in grams of 2.5 moles of c
Answers
————— x ————— = 30g
1 1 molC
H
3. The following data gives the p. H values of solutions
G, H, I, J and K.
Solution
P.H value
D Which of the solutions would be used to relieve a
stomach upset caused by indigestion?
1.5
6.5
13.0
7.0
Answers
Neutralization of Gastric Acid. In the duodenum, gastric acid is neutralized by sodium bicarbonate (pH of about 8.5)
The pH of sodium citrate solutions typically exceeds 7.0, and common antacid, calcium carbonate, is 9.91.
Considering bleach has a pH of about 13 that’s definitely the wrong answer.
7 sounds the most reasonable but 6.5 is not far off.
What is the total pressure in atmosphere (atm) of a gas mixture containing argon gas at 0.28 atm, helium gas at 760 mm Hg, and nitrogen gas at 760 torr?
Answers
Answer:
I dont know, sorry!
c) Discuss precision and Accuracy as they relate to types of errors.
what is the answer
Answers
Precision relates to the consistency and reproducibility of measurements, while accuracy reflects how close measurements are to the true value.
Precision and accuracy are two important concepts in the context of errors in measurements. While they both pertain to the quality of data, they refer to different aspects.
Precision refers to the degree of consistency or reproducibility in a series of measurements. It reflects the scatter or spread of data points around the average value. If the measurements have low scatter and are tightly clustered, they are considered precise. On the other hand, if the measurements have a high scatter and are widely dispersed, they are considered imprecise.
Accuracy, on the other hand, refers to the closeness of measurements to the true or target value. It represents how well the measured values align with the actual value. Accuracy is achieved when measurements have a small systematic or constant error, which is the difference between the average measured value and the true value.
Errors in measurements can be classified into two types: random errors and systematic errors.
Random errors are associated with the inherent limitations of measurement instruments or fluctuations in the measurement process. They lead to imprecise data and affect the precision of measurements. Random errors can be reduced by repeating measurements and calculating the average to minimize the effect of individual errors.
Systematic errors, on the other hand, are caused by consistent biases or inaccuracies in the measurement process. They affect the accuracy of measurements and lead to a deviation from the true value. Systematic errors can arise from factors such as instrumental calibration issues, environmental conditions, or experimental techniques. These errors need to be identified and minimized to improve the accuracy of measurements.
In summary, precision refers to the degree of consistency or reproducibility of measurements, while accuracy refers to the closeness of measurements to the true value. Random errors affect precision, while systematic errors affect accuracy. To ensure high-quality measurements, both precision and accuracy need to be considered and appropriate techniques should be employed to minimize errors.
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Bromine trifluoride’s free-energy change is –229.4 kJ/mol, and water vapor’s is –228.6 kJ/mol. Though their free-energy changes are almost the same, bromine trifluoride reacts violently with water vapor, releasing much more energy than the water vapor. The field of chemistry called ______________ explains why bromine trifluoride reacts one way and water vapor reacts another during a reaction.
Answers
The field of chemistry that explains why bromine trifluoride reacts differently than water vapor during a reaction is called chemical kinetics.
What is Energy?
Energy is a fundamental concept in physics, often defined as the ability to do work. It can take many different forms, including thermal energy, kinetic energy, potential energy, electromagnetic radiation, and chemical energy, among others. Energy can be transferred from one system to another, and it can also be converted from one form to another. The SI unit of energy is the joule (J), although other units such as the calorie and the electronvolt are also used in specific contexts.
The field of chemistry that explains why bromine trifluoride reacts differently than water vapor during a reaction is called reaction kinetics. Reaction kinetics is the study of how fast chemical reactions occur and what factors affect the reaction rate. It takes into account factors such as the nature of the reactants, concentration, temperature, surface area, and the presence of a catalyst or inhibitor.
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What is the molarity of aqueous lithium bromide if 25.0 mL of LiBr reacts with 10.0 mL of 0.250 M Pb(NO 3) 2
Answers
The molarity of aqueous lithium bromide, LiBr solution is 0.2 M
We'll begin by calculating the number of mole of Pb(NO₃)₂ in the solution.
Volume = 10 mL = 10 / 1000 = 0.01 L Molarity of Pb(NO₃)₂ = 0.250 MMole of Pb(NO₃)₂ =?Mole = Molarity x Volume
Mole of Pb(NO₃)₂ = 0.25 × 0.01
Mole of Pb(NO₃)₂ = 0.0025 mole
Next, we shall determine the mole of LiBr required to react with 0.0025 mole of Pb(NO₃)₂
Pb(NO₃)₂ + 2LiBr —> PbBr₂ + 2LiNO₃
From the balanced equation above,
1 mole of Pb(NO₃)₂ reacted with 2 mole of LiBr.
Therefore,
0.0025 mole of Pb(NO₃)₂ will react with = 2 × 0.0025 = 0.005 mole of LiBr
Finally, we shall determine the molarity of the LiBr solution
Mole = 0.005 mole Volume = 25 mL = 25 / 1000 = 0.025 L Molarity of LiBr =?Molarity = mole / Volume
Molarity of LiBr = 0.005 / 0.025
Molarity of LiBr = 0.2 M
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Which of these is an example of a physical property?
A. Iron combines with oxygen to rust.
B. Potassium reacts in water to form a base.
C. Sodium metal is soft and malleable.
D. Sodium ignites when placed in water.
Answers
if two substance are at the same temperature, their enthalpy
Answers
Answer:
cannot be measure
Hope this helps :) !!!
You need to get to your next class,150 meters away, and you can only walk in the hallways at about 1.5 m/s. How much time will it take you to get to your next class?
Answers
Answer:
100 seconds
Explanation:
150m÷1.5
=100
consider an excited-state hydrogen atom. What is the energy of the electron in the n = 4 level?
Answers
The energy of the electron is obtained as -0.85 eV.
What is the Bohr model?From the Bohr model of the atom, we know that the electrons that can be found in the shells of hydrogen do have a specific energy level where they could be found. As such the reason being the spectrum of the hydrogen atom is the movement of an electron from one energy level to another.
We can be able to obtain the energy of each of the orbits of the hydrogen atom by the use of;
E = -13.6/n^2
Where n is the principal quantum number.
E = -13.6/(4)^2
E = -0.85 eV
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Describe an experiment to show that pressure acts in all directions in liquids.
Answers
We frequently observe kids playing with polythene bags filled with water that have little holes drilled into them at various locations so they can sprinkle water on other kids. Through this experiment, we can say that pressure acts in all directions in liquids.
Liquid's pressureSince both liquids and gases may flow, they are both referred to as fluids. Fluids under rest pressure behave uniformly in all directions.
Weather forecasts can be made using barometers. They track the evolution of atmospheric pressure throughout time.
On weather forecast maps, pressure variations appear as an isobar pattern. Predictions are made using these changes in pressure, and they are fairly accurate when combined with wind observations.
Pressure and depth in liquidsAs you go away from a liquid's surface, pressure rises. for instance: A bucket has three holes that are all the same size. Since there is more pressure at the bucket's bottom, the water spills out more forcefully. Dams are thicker at the bottom for this reason.
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What is the result of two materials
rubbing against each other?
A. gravity
B. magnetism
C. force
D. friction
Ok
Answers
Answer:
D
Explanation:
Friction plays an important part in many everyday processes. For instance, when two objects rub together, friction causes some of the energy of motion to be converted into heat.
What is the present Ba in Ba(NO3)2?
Answers
Answer:
Percentage of Ba = 52.5%
Explanation:
We'll begin by calculating the molar mass of Ba(NO3)₂. This can be obtained as follow:
Molar mass of Ba(NO3)₂ = 137 + 2[14 +(16×3)]
= 137 + 2[14 + 48]
= 137 + 2[62]
= 137 + 124
= 261 g/mol
Next, we shall determine the mass of Ba in Ba(NO3)₂. This can be obtained as follow:
Mass of Ba in Ba(NO3)₂ = 137 g/mol
Finally, we shall determine the percentage of Ba in Ba(NO3)₂. This can be obtained as follow:
Percentage of Ba = mass of Ba / mass of Ba(NO3)₂ × 100
Percentage of Ba = 137 / 261 × 100
Percentage of Ba = 13700 / 261
Percentage of Ba = 52.5%
Thus, the percentage of Ba in Ba(NO3)₂ is 52.5%
Guysss how to explain nuclear chemistry? And define nuclear chemistry ?
Answers
Answer:
How do amoeba respire.
Define Diffusion.
-623.1 kJ/mol is how many kJ?
Answers
-623.1 kJ/mol is equal to -623.1 kJ.
explanation
To convert -623.1 kJ/mol to kJ, we simply drop the per-mole unit and leave the kJ unit.
Therefore, -623.1 kJ/mol is equal to -623.1 kJ.
This is because kJ/mol is a measure of molar enthalpy, which represents the amount of energy that is absorbed or released per mole of a substance during a chemical reaction.
In this case, the negative sign indicates that the reaction is exothermic, meaning that it releases energy in the form of heat.
Thus, the answer is:
-623.1 kJ/mol is equal to -623.1 kJ.
To get more electric current , we have to connect them in ______ combination.
a) Series combination
b) Parallel combination
c) Mixed combination
Answers
Answer:
A third type of circuit involves the dual use of series and parallel connections in a circuit; such circuits are referred to as compound circuits or combination
Explanation:
5. What type of intermolecular force gives water many of its characteristics?
hydrogen bonding
Oion-dipole forces
O dipole-dipole forces
dispersion forces
Answers
Answer:
Hydrogen bonding
Explanation:
Hydrogen bonding is the strongest intermolecular force in water, giving water many of its characteristics and acting to pull water molecules closer to each other.
I hope this helps!
what is the volume of 1.8 moles of chlorine gas at STP
Answers
STP stands foor standard temperature and pressure, and it is used with the assumintion that the gas behaves as an ideal gas. These conditions are standardized nowadays as temperature of 0°C and pressure of 1 bar.
In this conditions, the volume is directly proportional to the number of moles of the gas.
1 mol in STP conditions occupy 22.7 L.
Using rule of three, we have:
1.8 mol --- V
1 mol --- 22.7 L
\(\begin{gathered} \frac{1.8}{1}=\frac{V}{22.7L} \\ V=1.8\cdot22.7L \\ V=40.86L\approx41L \end{gathered}\)bromsted-lowry acids and bases
find out the acids and bases
Answers
Johannes Brsted and Thomas M. Lowry, two chemists, identified the Bromsted-Lowry acids and bases as a particular kind of acid-base reaction in 1923.
Acids are substances that give a base a proton (H+), whereas bases are substances that take a proton from an acid. In a Bromsted-Lowry acid-base reaction, the acid gives the base a proton in order to create the conjugate base and the conjugate acid, two new compounds.
Nitric acid (HNO3), sulfuric acid (H2SO4), and hydrochloric acid (HCl) are a few examples of acids. Sodium hydroxide (NaOH), ammonium hydroxide (NH4OH), and potassium hydroxide (KOH) are a few examples of bases.
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