Answers
Answer:
\(S^0 \rightarrow S^{+4}+4e^-\)
Explanation:
Hello,
In this case, for the reaction:
\(K_2Cr_2O_7 + H_2O + S \rightarrow SO_2 + KOH + Cr_2O_3\)
We first must assign the oxidation state of each element:
\(K^{+1}_2Cr^{+6}_2O_7^{+2} + H_2^{+1}O^{-2} + S^0 \rightarrow S^{+4}O_2^{-2} + K^{+1}O^{-2}H^{+1} + Cr_2^{+3}O_3^{-2}\)
Thus, we should remember that the oxidation half-reaction applies for the element undergoing an increase in its oxidation state, such case is sulfur, for which passes from 0 to +4 as shown below:
\(S^0 \rightarrow S^{+4}+4e^-\)
It means, that four electrons were lost due to the effect of the strong oxidizing agent, potassium dichromate.
Best regards.
Related Questions
A normal force has an equal but opposite_------------ force acting on it.
tension
applied
frictional
gravitational
Answers
Answer:
Newton's third law predicts that this force on the platform must be accompanied with an equal and opposite force applied to the man by the platform. ... Thus, in the situation of a horizontal object, the normal force is simple: it is merely equal in magnitude and opposite in direction to all forces applied to the surface.
Explanation:
Each element can be indentified by the number of _______ found in its nucleus, which also equals the elements _______ _______.
Answers
Answer:
Protons, Atomic number
As a scuba diver descends toward the bottom of the ocean, she experiences the sensation of her ears "popping." Based on your observations from the Can Crush Lab, why would this happen? (2 points)
Decreased pressure inside the diver's oxygen tank causes pressure on the diver's ears.
Increased pressure inside the diver's oxygen tank causes pressure on the diver's ears.
Pressure increases on the diver as the diver descends deeper underwater.
Pressure decreases on the diver as the diver descends deeper underwater
Answers
Answer: Pressure increases on the diver as the diver descends deeper underwater.
Explanation:
How many Rh atoms would have to be placed side by side to span a distance of 6.0 um?
Answers
22202 are the number of atoms to be placed side by side to span a distance of 6.0um.
What are atoms?The smallest unit of substance into which it is possible to divide without releasing electrically charged particles is the atom.
In addition, it is the smallest unit of matter with chemical element-like characteristics. The atom is thus the fundamental component of chemistry.
An atom of Rhodium (Rh) diameter d = 2.7x\(10^{-10}\) m.
Now assuming that keeping n atoms side by side , the distance will be L= 6um = 6.5 x \(10^{-6}\) m.
Now, the total length is given by total sum of diameter,
so the equation is given by,
L= nd
n= \(\frac{L}{d}\)
n= \(\frac{6.0x 10^{-6} m}{2.7x10^{10} } m\)
n= 22202 atoms.
Hence, there are total 22202 Rh atoms have to be placed side by side to span a distance.
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Calculate the molarity of the solution in a flask that contains 2.50 moles of potassium sulfate in 125 mL of solution.
Answers
Answer:
20M or 20mol/L
Explanation:
molarity = moles/volume (in Liters)
= 2.5/0.125L
=20M or 20 mol/L
Why do thermistors increase in conductivity when heated? What happens in normal metals? Explain on the atomic level.
Answers
Metal conductivity generally goes down or resistivity goes up with temperature goes up.
What is true of a Lewis base?
A. A Lewis base donates electron pairs.
B. A Lewis base donates H* ions.
C. A Lewis base donates a salt in solution.
D. A Lewis base donates OH ions.
Answers
The statement that is true of a Lewis base is that a Lewis base donates electron pairs (option A).
What is a Lewis base and acid?A Lewis base is any nucleophylic compound that can donate a pair of electrons and form a coordinate covalent bond.
On the other hand, a Lewis acid is any electrophylic compound that can accept a pair of electrons and form a coordinate covalent bond.
This means that a Lewis base can donate a pair of electrons to a Lewis acid to form a product containing a coordinate covalent bond. This product is also referred to as a Lewis adduct.
Therefore, option A is correct about Lewis base
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draw the structure for 2-methyl-3-propalhex-2-yne
Answers
The structure for 2-methyl-3-propalhex-2-yne can be shown in the image attached.
How do you draw the structure of a compound?We know that a compound is composed of atoms that can be found in the compound. For the organic compound, we can see that we can be able to obtain the structure of the compound from the structure.
The compound as we can see is 2-methyl-3-propalhex-2-yne. The structure of the compound must be able to include a double bond as we can clearly see from the image that is attached to this answer.
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we can smell because we have nose
Answers
yes it's true.
we can smell cause we have nose have smelling sense.
Answer:
Really? I thought we had noses to poke in other people's business
Stephan’s mother cuts a twig from a rose bush and plants it in the soil. After a few days, Stephan observes a new plant growing. Which characteristic does the growth of the new plant depict?
Answers
The growth of the new plant depicts the asexual reproduction characteristic. The characteristic that describes the growth of the new plant in Stephan's mother cutting a twig from a rose bush and planting it in the soil is asexual reproduction.
Asexual reproduction is the mode of reproduction by which organisms generate offspring that are identical to the parent's without the fusion of gametes. Asexual reproduction is a type of reproduction in which the offspring is produced from a single parent.
The offspring created are clones of the parent plant, meaning they are identical to the parent.The new plant in Stephan’s mother cutting a twig from a rose bush and planting it in the soil depicts the process of asexual reproduction, which is the ability of a plant to reproduce without seeds. In asexual reproduction, plants can reproduce vegetatively by cloning themselves using their roots, bulbs, or stems.
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How many grams are in 0.500 liters of SBr6?
Please show work if possible or say how to do it
Answers
Answer:
250 grams = 0.25 liter
Explanation:
what makes a substance a good insulator
Answers
Answer:
zoo wee mama
Explanation:
The particles that make up an object are held together by bonds. Insulators have strong bonds that hold their particles rigidly in place. This prevents particles from gaining energy and increasing the temperature. Wool, dry air, plastics, and polystyrene foam are all examples of good insulators.
Graded Assignment
Lab Report: Stoichiometry of Chemical Reactions
Answer the questions below. When you have finished, submit this assignment to your teacher by the due date for full
credit.Total score:
of 20 points
(Score for Question 1: of 2 points)
1. What is the balanced equation that represents the reaction between hydrogen and nitrogen to make ammonia
(NH3)?
Answer:
N2+3H2 2NH3
(Score for Question 2: of 5 points)
2. How many molecules of ammonia can be created when four molecules of nitrogen are combined with four
molecules of hydrogen? Include a drawing of the molecules in your answer.
Answer:
the number of ammonia molecules formed are 8/3|
Nitrogen gas
Score for Question 3:
G.
-
Hydrogen gas
of 5 points)
3. What ratio of nitrogen and hydrogen molecules would result in no left-over reactants? Explain your answer.
Answer: the balanced equation is N2+3H2 2N H3,, 1 molecule of Nitrogen combines with 3 molecules
of hydrogen to make 2 molecules of ammonia. And the ratio of nitrogen and hydrogen molecules
should be 1:3. so the answer is 1:3
Ammonia gas
Score for Question 4:
of 6 points)
4. If 100.0g of nitrogen is reacted with 100.0g of hydrogen, what is the excess reactant? What is the limiting
reactant? Show your work.
112NH3 1 molecule of nitrogen reacts with 3 molecules of ANSWERS PROVIDED
Answers
The balanced chemical equation for the reaction between nitrogen gas and hydrogen gas that produces ammonia is provided.N2+3H→2NH3.
What is the equation for the balanced reaction of hydrogen and nitrogen to produce ammonia (NH3)? The chemical equation for the reaction between nitrogen gas and hydrogen gas that produces ammonia gas is provided.N2+3H→2NH3.It is balanced, that much is true.On each side of the equation, there are an equal number of nitrogen (N) and hydrogen (H) atoms.See what the neighborhood has to say to get a badge.Nitrogen gas is produced in 8/3| ammonia molecules.Nitrogen and hydrogen would mix in a ratio of 1:3 in accordance with the electrical configuration and valency, leaving no residual reactants.3.57 moles are equal to 100/28 grams of nitrogen.As a result, 3.57 moles of nitrogen will combine with 3.57 moles of hydrogen to create ammonia, which has a mass of 7.1417 = 121.4 grams and a molecular weight of 3.572 = 7.14.To learn more about ammonia (NH3) refer
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What is the mass of 3.75 moles of NaCI? ( Na= 22.99g/mol, CI= 35.45 g/mol)
Answers
Answer:
219.15 grams
Explanation:
What is the mass of 3.75 moles of NaCI? ( Na= 22.99g/mol, CI= 35.45 g/mol)
Mole of Na = 22.99g
Mole of Cl = 35.45g
For NaCl we have ratio of 1:1, so we have 1 Na for every Cl
So we just add the two together to get the molar mass of NaCl which is
22.99 + 35.45 = 58.44g/mol
And we know we have 3.75 moles of NaCl so we multiply that by the molar mass of NaCl to get our answer
3.75 x 58.44 = 219.15grams
17. HAZWOPER training and certification recognizes:
a. A large number (as much as 80%) will self-present or be self-referred victims
b. Awareness level training will promote proper initial triage actions
c.
Victims will use any entrance they can enter at the hospital, in addition to the
emergency department entrance
d. Both A and C
Answers
HAZWOPER training and certification recognize:
a large number (as much as 80%) will self-present or be self-referred victimsVictims will use any entrance they can enter at the hospital, in addition to the emergency department entranceThe correct option is both A and C
What is the HAZWOPER training and certification?HAZWOPER (Hazardous Waste Operations and Emergency Response) training and certification recognize that a large number of victims (as much as 80%) in hazardous waste incidents or emergencies will self-present or be self-referred for medical treatment.
Additionally, HAZWOPER training acknowledges that victims may use any entrance they can access at a hospital, not just the emergency department entrance.
This is because individuals affected by hazardous materials may arrive at different areas of the hospital seeking medical assistance.
Therefore, option d. Both A and C are correct statements regarding the recognition of HAZWOPER training and certification.
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Describe the uses of chemical effects of electric current.
Answers
A sheet of aluminum measures 55.0 cm by 23.3 cm. If the volume is 2.90 cm^3 what is the thickness of the foil?
Express your answer with the appropriate units.
Answers
Answer:
0.0023 cm
Explanation:
The following data were obtained from the question:
Length (L) = 55 cm
Breadth (B) = 23.3 cm
Volume (V) = 2.9 cm³
Thickness (T) =?
Thus, we can obtain the thickness of the aluminum foil as illustrated below:
V = L × B × T
2.9 = 55 × 23.3 × T
2.9 = 1281.5 × T
Divide both side by 1281.5
T = 2.9/1281.5
T = 0.0023 cm
Therefore, the thickness of the aluminum foil is 0.0023 cm
For the given reactions determine if the entropy increases or decreases.
A) 2 KClO3 (s)⇌2 KCl (s)+3 O2 (g)
B) CoCl2 (s)+6 H2O (g)⇌CoCl2⋅6H2O
Answers
Entropy increases in reaction 1 due to increase in the number of particles while entropy decreases in reaction 2 due to decrease in the number of particles.
Entropy refers to the degree of disorderliness in a system. The higher the entropy, the more disorderly the system is and the lower the entropy, the less disorderly the system is. We must note that entropy increases with increase in the number of particles.
In the reaction, 2 KClO3 (s)⇌2 KCl (s)+3 O2 (g), entropy increases because one of the products is a gas and the number of particles increases from left to right. In the second reaction, CoCl2 (s)+6 H2O (g)⇌CoCl2⋅6H2O, entropy decreases because the number of particles decreases.
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Describe in your own words what is an air front is
Answers
Answer:
A front is a weather system that is the boundary separating two different types of air. One type of air is usually denser than the other, with different temperatures and different levels of humidity.
Baseballs pitched by a machine have a horizontal velocity of 30 meters/second. The machine accelerates the baseball from 0 meters/second to 30 meters/second in 0.5 seconds. If a baseball has a mass of 0.15 kilograms, the force the machine exerts is newtons. Use F = ma, where a = v − u t .
Answers
The machine exerts a force of 9 newtons on the baseball to accelerate it from 0 m/s to 30 m/s in 0.5 seconds.
To calculate the force exerted by the machine on the baseball, we can use Newton's second law of motion, which states that force (F) is equal to the product of mass (m) and acceleration (a).
In this case, the acceleration can be determined using the formula a = (v - u) / t, where v is the final velocity, u is the initial velocity, and t is the time taken for the acceleration.
Given:
Mass of the baseball (m) = 0.15 kg
Initial velocity (u) = 0 m/s (as the baseball starts from rest)
Final velocity (v) = 30 m/s
Time (t) = 0.5 s
First, let's calculate the acceleration:
a = (v - u) / t
a = (30 m/s - 0 m/s) / 0.5 s
a = 60 m/s^2
Now, we can use the calculated acceleration and the given mass to determine the force:
F = m * a
F = 0.15 kg * 60 m/s^2
F = 9 N
The machine exerts a force of 9 newtons on the baseball. This force is calculated using Newton's second law of motion, which states that force is equal to mass multiplied by acceleration.
By determining the acceleration of the baseball using the formula a = (v - u) / t and substituting the given values, we find that the acceleration is 60 m/s^2. Multiplying the mass of the baseball (0.15 kg) by the acceleration gives the force exerted by the machine as 9 newtons.
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The owner of Grizzly Tea Shack is thinking about adding iced tea to the menu. He
thinks he can do this with minimal effort by adding ice cubes to cups of hot tea.
He decides to measure how changing the number of ice cubes in a glass of
freshly brewed tea affects its cooling rate.
To begin, the owner varies the number of ice cubes, x, he puts in glasses of
freshly brewed tea. He then checks the temperature (in Celsius), y, of each glass
after 10 minutes.
Ice cubes Temperature after 10 minutes (in degrees Celsius)
2
17
3
5
6
6
20
10
11
15
Round your answers to the nearest thousandth.
Answers
Answer: 5,266
Explanation:
5,266
how does a buffer work?
A. it prevents added acids or bases from dissociating
B. it neutralizes acids or bases by precipitating a salt
C. it forms new conjugate pairs with the added ions
D. it bonds with the added H+ or OH- in solution
Answers
Answer:
It bonds with the added H+ or OH in solution.
Explanation:
Pls answer asap 100 points
For the oxidation of glucose (C6H12O6 + 6O2→6H2O + 6CO2), how many liters of carbon dioxide gas(CO2) will be produced when 950 g of glucose(C6H12O6) is oxidized completely?
Molar Masses:
C6H12O6 = 180.2 g/mol
Question 3 options:
709g
571g
960g
480g
Answers
Consider the following chemical reaction:
C(s)+H2O(g)→CO(g)+H2(g)
How many liters of hydrogen gas are formed from the complete reaction of 1.07 mol of C? Assume that the hydrogen gas is collected at a pressure of 1.0 atm
and a temperature of 317 K.
Express your answer using two significant figures.
Answers
Answer: 27.85 L
Explanation:
Ideal gas law
V = nRT/P
V = 1.07 X 0.0821 X 317 / 1= 27.85 L
fossil fuels form in sedimentary rocks when-
Answers
Answer:
fossil fuels form in sedimentary rocks when increased heat and pressure applies to fossils.
Explanation:
fossil fuels are made when sedimentary rock gets heat and pressure increased.
compared to a phosphorus atom, a P-3 ion has
Answers
Answer:
3 electrons more
explanation
minus sign in chemistry means more
homeworkstudycom
The smallest possible particle of an element is a(n) .
Answers
Answer: Atoms are the smallest particles of an element.
2.0 L of Carbon dioxide is heated from -25.0 °C to Standard Temperature.
What is the final volume of the gas?
Answers
The final volume of the gas that was heated from -25.0 °C to standard temperature is 2.2L.
How to calculate volume?The volume of a given gas can be calculated using the Charles law equation as follows:
V1/T1 = V2/T2
Where;
V1 = initial volumeV2 = final volumeT1 = initial temperatureT2 = final temperatureV1 = 2LV2 = ?T1 = -25°C + 273 = 248KT2 = 273K2/248 = V2/273
273 × 2 = 248V2
546 = 248V2
V2 = 546/248
V2 = 2.2L
Therefore, the final volume of the gas that was heated from -25.0 °C to standard temperature is 2.2L
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An early arrangement of the then known elements was proposed by a British scientist John Newlands, which he called the Law of Octaves. Like other scientists at the time, Newlands arranged the elements in order of increasing atomic mass and noted that every eighth element had similar physical/chemical properties. In the modern Periodic Table, which of the following represents the last pair of elements for which Newlands' Law of Octaves would hold true?
Answers
Which of the following is an incorrect representation for a neutral atom?
36Li
613C
3063Cu
1530P
Answers
This representation suggests that the element is phosphorus (P) with a mass number of 30, which is incorrect. The correct mass number for phosphorus is approximately 30.97. The incorrect representation for a neutral atom is 36Li
To determine the correct representation for a neutral atom, we need to consider the atomic number (Z) and mass number (A) of the element. The atomic number represents the number of protons in the nucleus, while the mass number represents the sum of protons and neutrons.
Let's analyze the given representations:
36Li:
This representation suggests that the element is lithium (Li) with a mass number of 36, which is incorrect. The correct mass number for lithium is approximately 6.94.
613C:
This representation suggests that the element is carbon (C) with a mass number of 13, which is correct. Carbon has different isotopes, and 13C represents one of its stable isotopes.
3063Cu:
This representation suggests that the element is copper (Cu) with a mass number of 63, which is correct. Copper has different isotopes, and 63Cu represents one of its stable isotopes.
1530P:
This representation suggests that the element is phosphorus (P) with a mass number of 30, which is incorrect. The correct mass number for phosphorus is approximately 30.97.
Therefore, the incorrect representation for a neutral atom is 36Li, as it does not match the known properties of lithium.
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