An electrochemical cell can generate or use electrical energy. The mass of solid chromium that will be deposited on the electrochemical plate is 7.17 gm.
What is current?Current in an electrochemical cell is the ratio of the quantity of electricity in columns and time in seconds.
Given,
Current (I) = 0.350 A
Time = 21.7 hours
Molar mass of chromium = 52.0 g/mol
First time is converted into seconds:
1 hour = 3600 seconds
21.7 hours = 76020 seconds
The quantity of electricity flowing in the electrochemical solution is calculated as:
[tex]\begin{aligned} \rm Q & = \rm It\\\\& = 0.350 \times 76020 \\\\& = 26607\;\rm C \end{aligned}[/tex]
Electricity required for depositing 1 mole or 52.0 g chromium is calculated as:
In electrochemical solution, chromium chloride is dissociated as:
[tex]\rm CrCl_{2} \rightarrow Cr^{2+} + 2 Cl^{-} \\\\\rm Cr^{2+} +2 e^{-} \rightarrow Cr[/tex]
Two moles of electrons are needed to deposit 52.0 g of chromium.
If, 1 electron = 96500 C
Then, 2 electron = 193000 C
The mass of chromium deposited is calculated as:
193000 C = 52 g chromium
So, 26607 C = [tex]\dfrac{26607 \times 52}{193000} = 7.17 \;\rm gm[/tex]
Therefore, 7.17 gm of chromium is produced.
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What is the number of moles of solute in 7.3L of a 4.6M solution?
Answer:
33.58 Moles
Explanation:
7.3 L * 4.6 M / L = 33.58 Moles
Kathleen makes iced coffee by adding ice to her room temperature coffee in a glass. What statement explains what is taking place inside her glass?
The ce molecules will slow down over time.
The coffee molecules will speed up over time.
The cold is transferred from the ice to the coffee.
The heat is transferred from the coffee to the ice.
Answer:
The answer is the heat is transferred from the ice to the coffee.
Explanation:
Hot molecules tend to transfer to colder molcules, which causes the ice to melt and makes the coffee colder.
Hope this helps! :)
what is the heat of fusion of water in calories per mole?
Answer:
79.72 Calories
Explanation:
Answer:The heat of fusion for water at 0 °C is approximately 334 joules (79.7 calories) per gram, and the heat of vaporization at 100 °C is about 2,230 joules
Explanation: i really hope this helps but im not sureif this is exactly what your looking for :)
The arrows and yellow colored blocks indicate the ? Elements
Answer: The arrow and blue colored blocks denote the transition metal components.
Do you think a benitoite ring would be costly or inexpensive?
Answer:
I think it would be costly due to the fact that the gem is very rare and gorgeous. Also, the current prices are on average $3,000 per carat, so I would say that is pretty costly.
Explanation:
Hope this helps:)....if not then sorry for wasting your time and may God bless you:)
What is the molarity of the 8.76 g of Na2S dissolved in 0.500 L of solution?
Answer:
.224 M
Explanation:
To begin, we need to find the molar mass of Na2S
Na=22.99g, S=78.05g2(22.99)+1(32.07)=78.05To find Molarity, we use the equation M=moles/Liters of solution
We are given grams, so we must divide by the molar mass of Na2S to find moles.
8.76g Na2S / 78.05g/mol Na2S= .112 molesNow we use our Molarity equation:
.112 moles Na2S / .500L of solution = .224 MOne pound (1.00 lb) of body fat is equivalent to approximately 3.488 x 103
kcal.
The average amount of calories burned during running is 125 kcal/mile.
How many miles does an athlete have to run to burn off 1.00 lb of body fat?
Show your calculations.
Your Answer:
1 mil
2400
270
Since one pound (1.00 lb) of body fat is equivalent to approximately 3.488 x 10^3 kcal, then 27.9 miles must be covered to burn off one pound.
What is energy?Energy is defined as the ability to do work. Now we are told that one pound (1.00 lb) of body fat is equivalent to approximately 3.488 x 10^3
kcal.
Hence;
If 125 kcal is burnt by running one mile
3.488 x 10^3 kcal is burnt by running x miles
x = 3.488 x 10^3 kcal * 1 mile/125 kcal
x = 27.9 miles
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What’s the answer to this?
Benzene
Benzene has low density than the water itself of about 0.9 g/cm³
Low denisty object than the water usually floats on the water.
Another example: orange peel which floats on water has density of about 0.84 g/cm³
As far as terrain, mountainous northern coast otherwise known as the
A. Sierra Nevada Mountains
B. Atlas Mountains
C. Rif Mountains
D. Appalachians
Bonding with intermolecular forces:
1.) is IBr a hydrogen bonding? yes or no?
2.) is IBr dipole-dipole interactions? Yes or no?
3.) is IBr a london dispersion forces? Yes or no?
Answer:
1.) is IBr a hydrogen bonding? yes or no? =No, IBR isn't a hydrogen bonding beacuse there are no H atoms and neither atom is N, O, F.2.) is IBr dipole-dipole interactions? Yes or no? = Yes, IBR is a dipole-dipole interactions beacuse Both I and Br are large molecules with lots of electrons.3.) is IBr a london dispersion forces? Yes or no?= No, IBR isn't a london dispersion forces because IBr is a polar dispersion force.Answer :
See below ~
Explanation :
1) No
IBR isn't a hydrogen bonding beacuse : there are no H atoms and neither atom is N, O, F.2) Yes
IBR is a dipole-dipole interactions beacuse Both I and Br are electronegative (dipolar) molecules with lots of electrons.3) No
IBR isn't a london dispersion forces because IBr is a polar dispersion force, and London forces are only present in non-polar dispersion forcesWhich chemical equation is balanced
Answer: D
Explanation:
The reason it is D is because a balanced chemical equation will always have the same number of atoms on both sides. In answer d, both sides have a total of 4 atoms, so it it balanced.
A breakfast of cereal, orange juice, and milk might contain 230 nutritional Calories. How much is this in Joules?
A) 200,970 J
B)962,320 J
C)740,980 J
D)100,525 J
Answer:
B
Explanation:
962,320 J
230 nutritional Calories in Joules is 962,320 J
Another word for axis tilted on its side
SOLUTIONS
SHOW COMPLETE, CONVINCING WORK FOR THE FOLLOWING:
1.
A student is instructed to make 500.0 ml of 1.200 M silver nitrate solution for a lab. A stock solution of 5.00 M silver nitrate
is available. How many milliliters of the stock solution are required to make the solution needed for the lab?
120 mL
Answer: Because percent solutions can be expressed in three different ways, it is imperative that the type of percent solution be explicitly stated. If this information is not provided, the end user is left to "guess" whether w/v %, w/w %, or v/v % was used. Each percent solution is appropriate for a number of different applications. For example, commercial aqueous reagents, such as concentrated acids and bases, are typically expressed as weight/weight % solutions. For example, commercially available concentrated hydrochloric acid (HCl) is 37% by weight (w/w %). On the other hand, many dilute solutions used for biological research are expressed as weight/volume % (e.g., 1% sodium dodecyl sulfate, SDS). Volume/volume % solutes are also common, and are used when pure solutes in liquid form are used. For example, a 70 % (v/v) solution of ethanol can be prepared by dissolving 70 mL of 100% (i.e., 200 proof) ethanol in a total solution volume of 100 mL.
pls help me with this questionnn :))
Answer:
B. Sill
Explanation:
Magma that squeezes between horizontal rock layers hardens to form a sill. A dome mountain forms when uplift pushes a large body of hardened magma toward the surface, which eventually becomes exposed.
Which statements about fresh-water sources are true.? (Multiple Choice) (please help asap thanks!:)
Answer:
The correct answers are:
"Only about 3 percent of Earth's water is fresh water."
"About 75% percent of the fresh water on Earth is frozen in ice sheets."
"The largest source of usable fresh water is groundwater."
Explanation:
3 percent of Earth's water is most certainly fresh water. Confirmed with a few fact checks.
The largest source of usable fresh water on Earth is groundwater. It's more difficult to access but it's there and much more usable than water say frozen in ice on the sea.
The most correct option left would be 75% of Earth's freshwater being in ice sheets even though it's about 70%.
Does CH3F have a higher boiling point than BRF?
Answer:
The boiling point of the fluoromethane (CH3F) is higher than that of fluorine (F2).
please answer all parts and explain?
Answer:
a
Explanation:
this is the correct answer
How much energy is needed to raise the temperature of 15.21 g of a substance with a specific heat of 1.65 J/g°C from 137.0 °C to 234.3 °C?
Answer:
2441.9 Joules
Explanation:
This is a sensible heat change problem.
Energy = Specific Heat Capacity x Mass x Change in Temperature
To find the change in temperature, you need to use this formula: Temperature Final - Temperature Initial.
234.3 - 137.0 = 97.3
Energy = 1.65 x 15.21 x 97.3
Multiply that equation, and you get your answer! I hope this helps!
Please solve the question.
Answer:
B
Explanation:
I think it might be B because if the student's hypothesis was incorrect why redo it and make sure the results are the same as last time if it was already incorrect before.
What is the molarity of a solution that is prepared by adding 3 moles of CaSO4 in 1.5 L of water?
Answer:
[tex][CaSO_4] = 2 mol/L[/tex]
Explanation:
[tex][CaSO_4] = \frac{3 mol}{1.5 L} = 2 mol/L[/tex]
Many states require drivers to use hands-free cell phones only. A) TrueB) False
Answer:
True.
Explanation:
Typically, cars have built in radios for the reason of not using your phone. That's why you connect it with bluetooth to call, text, and use personal music instead of listening to the ones on the radio.
Answer:
True
Explanation:
It is to keep us safe. So, we answer calls without having to take our hands off the wheel. Although it is unsafe for that aswell. The best thing to do is have 0 things that would keep you from having your eyes on the road.
how is preciptation formed
(im rlly bad at this D:
Answer:
precipitation is formed by to much water in a cloud
Explanation:
What does the scientific method help test in environmental science?
The scientific method is a way to test a
and gain a better understanding of the world.
Answer:
The scientific method is a way to test a hypothesis and gain a better understanding of the world.
Explanation:
The scientific method is a process used to explore observations and answer questions. The usual process involves making conjectures -that would be the hypotheses-, drawing predictions resulting from a logical consequence, and carring out experiments based on those predictions. The ultimate goal is to test a scientific hypothesis.
Write the letter of the correct answer on the line
1.
-Which of the following is an opening
through which molten rock and gas leave a
volcano?
A pipe
B magma chamber
C crater
D vent
Answer:
D. Vent is the answer please
write the net ionic reaction for barium nitrate + lithium iodide
The net ionic reaction for barium nitrate and lithium iodide showing the precipitation of barium iodide is given below:
[tex]Ba^{2+}(aq) + 2I^{-}(aq) \rightarrow BaI_2(s)[/tex]
What is a net ionic equation?A net ionic equation is an ionic equation which shows only the ions that have undergone both reduction and oxidation only without any spectator ions present.
The net ionic reaction for barium nitrate + lithium iodide is given below:
[tex]Ba^{2+}(aq) + 2I^{-}(aq) \rightarrow BaI_2(s)[/tex]
Therefore, net ionic reaction for barium nitrate and lithium iodide shows the precipitation of barium iodide.
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How does the heat flow from the coffee to the part of the spoon in the coffee?
Answer:
Heat flows from the coffee to the spoon through conduction
Explanation:I did the lab assignment
Answer:
Heat can travel from one place to another in three ways: Conduction, Convection and Radiation. As the spoon is in direct contact with hot mug of coffee the heat will transfer to spoon this represent the process of conduction.
If 10 moles of a gas are at a pressure of 3.6 atm and at a temperature of 27°C, what is the volume of the container that the gas is in.
Answer:
68.4 liters
Explanation:
PV = nR T R = gas constant = .082057 L atm / K-mole
n = 10 T = 27C = 300.15 K
3.6 V = 10 * .082057 * 300.15 solve for V = 68.4 liters
Three examples of
solid and gas solution
Answer:
Solutions having solvent in solid-state and solute in the gaseous state are called gas-solid solution. Hydrogen is a gas at STP and platinum is solid. Hence, Hydrogen gas adsorbed on the surface of platinum is an example of gas in solid solution.
Identify those elements that can be isolated by electrolysis of their aqueous salts. (Select all that apply.)
lithium
tin
strontium
chlorine