1a. The theoretical yield of Fe₂O₃ obtained is 17.14 g
1b. The percentage yield of Fe₂O₃ obtained is 82.9%
2. The molarity of the KCl solution is 0.04 M
1a. How to determine the theoretical yield of Fe₂O₃Balanced equation
4Fe + 3O₂ —> 2Fe₂O₃
Molar mass of Fe = 56 g/mol
Mass of Fe from the balanced equation = 4 × 56 = 224 g
Molar mass of Fe₂O₃ = (56×2) + (16×3) = 160 g/mol
Mass of Fe₂O₃ from the balanced equation = 2 × 160 = 320 g
SUMMARY
From the balanced equation above,
224 g of Fe reacted to produce 320 g of Fe₂O₃
Therefore,
12 g of Fe will react to produce = (12 × 320) / 224 = 17.14 g of Fe₂O₃
Thus, the theoretical yield of Fe₂O₃ is 17.14 g
1b. How to determine the percentage yield Actual yield of Fe₂O₃ = 14.21 gTheoretical yield of Fe₂O₃ = 17.14 gPercentage yield of Fe₂O₃ =?Percentage yield = (Actual / Theoretical) × 100
Percentage yield of Fe₂O₃ = (14.21 / 17.14) ×100
Percentage yield of Fe₂O₃ = 82.9%
2. How to determine the molarity of the KCl solutionMole of KCl = 5.1 molesVolume = 126.81 LMolarity of KCl =?Molarity = mole / volume
Molarity of KCl = 5.1 / 126.81
Molarity of KCl = 0.04 M
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A block and tackle machine is used to raise 300 kg grand piano a vertical distance of 12.5 m. If the efficiency of the block and tackle machine is 0.80, how much work must the piano movers do in lifting the piano ? a. 45938 J b. 36750 J c. 29400 J d. 4688 J
The amount of work done by the piano mover in lifting the piano 45938 J (Option A)
What is efficiency?This can be defined as the capacity to achieve a given task with little or no waste. Mathematically, it can be expressed as
Efficiency = (output / input) × 100
How to determine the work inputMass (m) = 300 KgDistance (s) = 12.5 mEfficiency = 0.80Acceleration due to gravity (g) = 9.8 m/s²Output = mgs = 300 × 9.8 × 12.5 = 36750 JInput = ?Efficiency = output / input
Input = Output / efficiency
Input = 36750 / 0.8
Input = 45938 J
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(1.) A 0.5 kg basketball rolls off the roof of a building. At a moment when it is 3 m above the ground, it has a speed of 2.5 m/s. What is the total mechanical energy of the basketball ?
(2.) In the previous problem, how much kinetic energy does the football possess just after the throw? Assume that the football started from rest.
Answer:
The answer is C.
Explanation:
Since the total mechanical energy is conserved, kinetic energy (and thus, speed) will be greatest when the potential energy is smallest.
(1) A positive charge +3 C is separated from another positive charge of +5 C by a distance of 7m. What is the magnitude of the electric force between the two charges?
(a.) 1.9 × 10 to the 10th power N (b.) 2.8 × 10 to the 9th power N (c.) 2.1 N (d.) 0.31 N
(2) A molecule has 223 electrons and 218 protons. what is the net charge on the molecule ? (a.) 5 × 10 the the - 19th power C (b.) - 5 × 10 to the - 19th power C (c.) 8 × 10 to the - 19h power C (d.) -8 × 10 to the - 19th power C
(3) A negative charge of 2 × 10 to the negative 4 C and a positive charge of 8 × 10 to the negative 4 C are separated by a distance of 0.3 m. what is the magnitude of the force between the charges? (a.) 4800 N (b.) 1.78 × 10 to the - 6th power N (c.) 16000 N (d.) 0.001 N
(4) Which one of these statements is true of a neutral or charged object?
(a.) A neutral object does not have any charged particles in it.
(b.) A neutral object does not have any protons or electrons in it.
(c.) A neutral object has equal numbers of protons and electrons.
(d.) The protons and electrons in a neutral object do not have any charge.
THEY ARE ALL SEPARATE QUESTIONS
THANK YOU
1. The magnitude of the electric force between the two charges is 2.8×10⁹ N (Option B)
2. The net charge on the molecule is -8×10⁻¹⁹ C (Option D)
3. The magnitude of the force between the charges is 16000 N (Option C)
4. The correct statement is: A neutral object has equal numbers of protons and electrons. (Option C)
1. How to determine the forceCharge 1 (q₁) = +3 CCharge 2 (q₂) = +5 CElectric constant (K) = 9×10⁹ Nm²/C²Distance apart (r) = 7 mForce (F) =?F = Kq₁q₂ / r²
F = (9×10⁹ × 3 × 5) / (7)²
F = 2.8×10⁹ N
2. How to determine the net charge on the moleculeElectron = 223 electronsProton = 218 protonsNet Charge =?Charge = Proton - Electron
Charge = 218 - 223
Charge = -5 electrons
But
1 electron = 1.6×10⁻¹⁹ C
Thus,
Net Charge = -5 × 1.6×10⁻¹⁹ C
Net Charge = -8×10⁻¹⁹ C
3. How to determine the forceCharge 1 (q₁) = 2×10⁻⁴ CCharge 2 (q₂) = 8×10⁻⁴ CElectric constant (K) = 9×10⁹ Nm²/C²Distance apart (r) = 0.3 mForce (F) =?F = Kq₁q₂ / r²
F = (9×10⁹ × 2×10⁻⁴ × 8×10⁻⁴) / (0.3)²
F = 16000 N
4. What is a neutral object?A neutral object is an object having equal numbers of protons and electrons. For example, an object with 4 protons and 4 electrons is said to be neutral as illustrated below
Electron = 4 electronsProton = 4 protonsNet Charge =?Charge = Proton - Electron
Charge = 4 - 4
Charge = 0 (neutral)
Thus, the correct statement about neutral object, given in the question is: A neutral object has equal numbers of protons and electrons (Option C)
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Using the formula for work, Match the Force × Distance problems with their correct "Work Performed" answer. The first example has been completed for you.
Force × Distance = Work Performed
10 newtons 6 meters =60 Nm
1. 62 Nm
40 pounds 100 feet
2. 4000ft.-lbs.
2.5 pounds 24 inches
3. 5 ft.-lbs
62 newtons 1 meter
4. 200ft.-lbs.
1 ton 20 feet
5. 40,000 ft.-lbs.
400 pounds 0.5 feet
(1.) When aqueous solutions of Fe(NO3)3 and NaOH are mixed, Fe(OH)3 and NaNO3 are formed. is there a precipitate formed? if yes, write the formula for the precipitate and explain why it is the precipitate using the solubility rules. (2.) When aqueous solutions of potassium iodide and Lead (II) nitrate are combined, potassium nitrate and solid lead (II) iodide are formed. Write the balanced,complete ionic and net ionic equations for this reaction
From the solubility rules, both reactions 1 and 2 lead to precipitates.
What is a precipitate?The term precipitate refers to the solid that separates out of the reaction mixture . We know that the solubility of a substance in water is predicated on the solubility rules.
1) The reaction here is;
Fe(NO3)3(aq) + 3NaOH(aq) ------> Fe(OH)3(s) + 3NaNO3(aq) - The precipitate is Fe(OH)3 because only the hydroxides of group 1 elements are soluble in water.
2) The reaction is;
Pb(NO3)2(aq) + 2KI(aq) ----->PbI2(s) + 2NaNO3(aq) - The precipitate is PbI2 because most iodides are soluble except the iodides of Ag+, Hg+2, and Pb+2
Complete Ionic equation;
Pb^2+(aq) + 2NO3^-(aq) + 2K^+(aq) + 2I^-(aq) ------> PbI2(s) + 2NO3^-(aq) + 2K^+(aq)
Net ionic equation;
Pb^2+(aq) + 2I^-(aq) ------> PbI2(s)
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Can someone tell me what's the formular for extension? Thank youu
Answer:
F = ke
Explanation:
F is the applied force.
k is the spring constant.
And e is extension.
It can be re-arranged as k=F/e or e=F/k. It is Hooke's law.
F = ke is the formula for the extension.
When an object's length rises, extension occurs, and when it reduces, compression occurs. Hooke's law states that force applied by a spring equals extension minus the spring constant. This law describes the extension of an elastic item, such as a spring.
The lengthened portion of an object, such as a spring, is known as its extension. According to Hooke's law, as long as the limit of proportionality is not crossed, a spring's extension is directly proportionate to the force exerted.
F = ke
F is the applied force.
k is the spring constant.
And e is an extension.
It can be re-arranged as k=[tex]\frac{F}{e}[/tex] or e=[tex]\frac{F}{K}[/tex]. It is Hooke's law.
Understanding the behavior of the material as it is stretched or compressed requires knowledge of Hooke's law. By comprehending the material behavior features, technology can be improved.
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A crowbar with the length of 200 cm is used to lift the load of 600 Newton . If the distance between fulcrum and load is 0.75 . Calculate Effort , Mechanical advantage and Velocity ratio
Answer:
a. Effort = 960 Newton
b. Mechanical advantage (M.A) = 0.625
c. Velocity ratio (V.R) = 1.67
Explanation:
Given the following data;
Load = 600 N
Length of crowbar = 200 cm
Length of load arm = 0.75 m
Conversion:
100 cm = 1 m
X cm = 0.75 m
Cross-multiplying, we have;
X = 0.75 * 100 = 75 cm
First of all, we would find the effort arm;
Effort arm = length of crow bar - length of load arm
Effort arm = 200 - 75
Effort arm = 125 cm
Next, we would determine the mechanical advantage (M.A) of the crow bar;
Substituting the values into the formula, we have;
M.A = 0.625
To find the effort of the crow bar;
Making "effort" the subject of formula, we have;
Effort = 960 Newton
Lastly, we would determine the velocity ratio (V.R);
V.R = 1.67
Answer:a. Effort = 960 Newton
b. Mechanical advantage (M.A) = 0.625
c. Velocity ratio (V.R) = 1.67
Explanation:
Why would an object have a much lower maximum speed falling through water than falling through air?
Answer:
Explanation:
when objects move through a fluid such as air or water the fluid exerts a frictional force on the moving object. the frictional force from fluid is called a drag force friction drag force causes objects to slow down as they move through a fluid such as air or water.
Two identical negative charges exert a repellent force of 150 N on each other when they are 40 cm apart. that is the magnitude of each negative charge?
a. 2.7 nC
b. 51.6 microC
c. 0.67 microC
d. 0.82 mC
What is the first stage of metamorphosis?
Adult
Egg
Larva
Nymph
What type of presentation us easier to plan using a site map?
A. a presentation that lets users link our from a “home” page or slide
B. an animation created digitally using a program like Flash
C. a slide show that starts on slide one and goes slide by slide to the end
Answer:
I believe that the answer would be A
Explanation:
because there is all of the examples I found online have a home page.
100 POINTS+BRAINLIEST: 8TH GRADE SCIENCE - EVAPORATION VS VAPORIZATION: is option B actually wrong? Because vaporization involves a solid OR liquid turning into a gas above BP, while evaporation is when liquid turns into gas below the BP (boiling point). If I'm wrong please explain why -Thanks!!!!
Answer:
Explanation:
Vaporization occurs during the boiling/sublimation process. That is the only reason why I could see this being marked as wrong.
Answer:
Explanation:
yes it is wrong vaperation only occurs during the boiling process