0.042 moles of Hydrogen evolved
Further explanationGiven
I = 1.5 A
t = 1.5 hr = 5400 s
Required
Number of Hydrogen evolved
Solution
Electrolysis of water ⇒ decomposition reaction of water into Oxygen and Hydrogen gas.
Cathode(reduction-negative pole) : 2H₂O(l)+2e⁻ ⇒ H₂(g)+2OH⁻(aq)
Anode(oxidation-positive pole) : 2H₂O(l)⇒O₂(g)+4H⁻(aq)+4e⁻
Total reaction : 2H₂O(l)⇒2H₂(g)+O₂(g)
So at the cathode H₂ gas is produced
Faraday : 1 mole of electrons (e⁻) contains a charge of 96,500 C
[tex]\tt mol~e^-=\dfrac{Q}{96500}[/tex]
Q = i.t
Q = 1.5 x 5400
Q = 8100 C
mol e⁻ = 8100 : 96500 = 0.084
From equation at cathode , mol ratio e⁻ : H₂ = 2 : 1, so mol H₂ = 0.042
The name of the formula MnCl7
I need a lot of help pls help me
What would the final freezing point of water be if 3 mol of
sugar were added to 1 kg of water (Kx = 1.86°C/(mol/kg)
for water and i = 1 for sugar)?
A. -1.86°C
B. -5.58°C
C. -0.62°C
Ο Ο
D. +5.58°C
SUBMIT
Answer:
B. -5.58°C.
Explanation:
Hello!
In this case, since the freezing point depression is computed as follows:
[tex]\Delta T_f=-i*m*Kf[/tex]
Whereas i=1 as the van't Hoff's factor of sugar (nonionizing solute), m=3mol/1kg=3mol/kg as the molality and Kf=1.86 °C/(mol/kg) as the freezing point depression constant for water. In such a way, we plug in to obtain:
[tex]\Delta T_f=-1*3\frac{mol}{kg} *1.86\frac{\°C}{mol/kg} \\\\\Delta T_f=-5.58\°C[/tex]
Now, since the freezing point of pure water is 0°C, we infer that freezing point of such solution is:
B. -5.58°C.
Best regards!
01:29:56
What must be true about two objects if heat is flowing between them?
The objects must be different temperatures.
The objects must be the same temperature.
The objects must both be over room temperature.
The objects must both be under room temperature.
Answer:
a
Explanation:
i just took the quiz
what are connecting components
Answer:
In graph theory, a component of an undirected graph is an induced subgraph in which any two vertices are connected to each other by paths, and which is connected to no additional vertices in the rest of the graph.
Fill in the process that causes each transition. Your choices are evaporation, condensation, precipitation, melting, and freezing
A. Ocean-> Atmosphere __________
B. Atmosphere-> clouds
__________
C. Cloud-> snow
__________
D. Glacier (river of ice) -> River ________
E. Cloud-> soi
__________
Answer:
1. Oceans -> Atmosphere = Evaporation
2. Atmosphere -> Clouds = Condensation
3. Cloud -> Snow = Freezing
4. Glacier -> River = Melting
5. Cloud -> Soil = Precipitation
Explanation
1. When liquid water is heated by the sun it evaporates into the atmosphere
2. When the saturated air cools down in the atmosphere, Water vapor condenses into tiny droplets to form a cloud
3. When the Temp is below freezing, water droplets crystalize into snow flakes.
4. Glaciers melt into the River
5. The cloud precips into soil
the other person got it really wrong.
A, B, C, D, and E would be evaporation, condensation, freezing, melting, and precipitation respectively
Phase TransitionWater from the ocean gets into the atmosphere by evaporation.The water vapors in the atmosphere condense together by various processes to form different clouds.Clouds cool to a freezing temperature and become snows.Glaciers melt and the resulting water turns into nearby rivers.Cloud causes precipitation and the water goes into soils.More on cloud formation can be found here: https://brainly.com/question/1242352?referrer=searchResults
Which list of elements contains a metal, a melalloid and a nonmetal
Answer:
group 15 ( the nitogen group)
Explanation:
Why was Niels Bohr’s atomic model superior to all the earlier models?
A.
It proved that the atom was indivisible and therefore the smallest unit of matter.
B.
It showed how the electron could orbit the nucleus without falling into it.
C.
It was the first to show that the atom had no net charge.
D.
It used wave behavior to explain the positions of electrons around the nucleus.
Answer:
B
Explanation:
The Niels Bohr's atomic model superior to all the earlier models is because it showed how the electron could orbit the nucleus without falling into it
Explain how the
total number of
atoms are
different from
the total number
of elements in a
compound
Why is there no sound in outer space? PLEASE HELP IF YOU WANT BRAINLEIST AND A LIKE ON URE COMMENT!
A. The speed of sound is too slow for space.
B. There is no medium in which it can travel.
C. There are too many other noises.
D. There is only echolocation in space.
Answer:
B
Explanation:
Identify 3 characteristics that would be taken into consideration when evaluating any proposed site for a national repository of nuclear waste.
Answer:
Proximity to water bed/water sourceGeographical isolation and barriersunavailability of plant or any biosystemExplanation:
A nuclear repository would be required to be isolated with barriers in place to keep people out. Ideally, it should be stored underground and away from any underlying waterways, or biosystems so as to avoid contamination. A good example would be the proposed Yucca Mountain repository.
I hope this was helpful and useful.
The radioactive substance has a lot of distinction and variation and needs to be kept aside from the environment and it of reach for most nuclear power plants to discharge the gases.
There is various consideration that needs to keep in mind such as the size of the container, temperature of the gas, and amount of gas in the container. Other considerations include the closeness to water bed/water source, the locational isolation, and barriers , unavailability of plant or any biosystem in case of the nuclear wastes.Learn more about the characteristics that would be taken into consideration.
brainly.com/question/5562285.
how are Ionic and Covalent Bonds are formed with examples ?
Answer:Comparison of Ionic and Covalent Bonds
In an ionic bond, the atoms are bound together by the electrostatic forces in the attraction between ions of opposite charge. ... For example, sodium (Na), a metal, and chloride (Cl), a nonmetal, form an ionic bond to make NaCl. In a covalent bond, the atoms bond by sharing electrons.
pls add Brainliest
PLSASE HURRY I REALLY NEED IT
Consider this graph showing temperature over time. What would happen in the situation? The temperature decreases from 25° to 15°C, the material ____ heat and its kinetic energy ____ as the material, freezes to become a solid.
Answer:
One of the major effects of heat transfer is temperature change: heating increases the temperature while cooling decreases it. We assume that there is no phase change and that no work is done on or by the system. Experiments show that the transferred heat depends on three factors—the change in temperature, the mass of the system, and the substance and phase of the substance.
Johnson, Taniya
A student travels on a trail by bicycle 20 miles in 2 hours. What is the average speed of the student?
Answer:
i think its 10 miles per hour
1.7 x 10 cm= significant figures
Answer:
its 2
Explanation:
How do you know whether or not a chemical
reaction equation follows the law of
conservation of mass?
Answer:
- Because it has or not the same number of atoms at each side.
- Because the mass of reactants and product is or not the same after the reaction.
Explanation:
Hello!
In this case, since the law of conservation of mass states that matter cannot be created nor destroyed; when we see a chemical reaction, we need to make sure that the amount of atoms is the same at both reactants and products; for instance the formation of water requires four hydrogen atoms and two oxygen atoms at both reactants and products sides as shown below:
[tex]2H_2+O_2\rightarrow 2H_2O[/tex]
Another way is by proving that the total mass of products equals the total mass of reactants once the reaction has gone to completion.
Best regards!
How can you identify a redox reaction?
O A. The number of protons has changed in an atom.
O B. Electrons have transferred from one atom to another.
O C. The charges on each side of the equation cancel.
O D. Metal atoms have rearranged in the compounds.
SUBMIT
PREVIOUS
Answer: The Correct Answer is Choice B.
Explanation: I just took the quiz.
ANSWER:
B. Electrons have transferred from one atom to another.
EXPLANATION:
An oxidation-reduction (redox) reaction is a reaction which involves the change in oxidation number of the atoms involved. Since the oxidation number changes, this means that one atom has to lose electrons and another has to accept electrons. The reactant that loses electrons is called REDUCING AGENT while the reactant that gains electrons is called OXIDIZING AGENT.
For example, in a reaction between iron and oxygen as follows:
4Fe+ 3O2→2Fe2O3
Iron is reduced from +2 to 0 because it accepts electrons from oxygen while oxygen is oxidized from -2 to 0 because it transfers electrons to iron.
Hence, a redox reaction can be identified by the transfer of electrons from one atom to another.
Learn more: https://brainly.com/question/13293425
Why can you see solids and liquids, but not most gases?
Why can gases and liquids be paired but not solids?
The atoms and molecules in gases are much more spread out than in solids or liquids. They vibrate and move freely at high speeds. A gas will fill any container, but if the container is not sealed, the gas will escape. Gas can be compressed much more easily than a liquid or solid.
H3PO4 what’s the name?
Answer:
Phosphoric acid
Explanation:
Answer:
Phosphoric acid
Explanation:
Phosphoric acid is an oxyacid, which is formed when hydrogen combines with the polyatomic ion phosphate. The polyatomic ion for phosphate is [tex]PO_4^-3[/tex]. To combine this with hydrogen, we "criss-cross" the charges of phosphate (which has a charge of -3) and hydrogen (which has a charge of +1) to get [tex]H_3(PO_4)_1[/tex], the same as [tex]H_3PO_4[/tex].
To answer this question, we essentially reverse these steps. First, we would recognize that this is a hydrogen atom bonded with phosphate. Because phosphate is a polyatomic ion, we know that this is an oxyacid. Because it involves phosphate, we call it phosphoric acid.
I hope this helps!
How many moles of Aluminum are produced when34.2 g of alumina are broken down through the process of electrolysis
Answer:
0.670 mol
Explanation:
Step 1: Write the balanced reaction for the decomposition of alumina
2 Al₂O₃ ⇒ 4 Al + 3 O₂
Step 2: Calculate the moles corresponding to 34.2 g of Al₂O₃
The molar mass of Al₂O₃ is 101.96 g/mol.
34.2 g × 1 mol/101.96 g = 0.335 mol
Step 3: Calculate the moles of Al produced from 0.335 moles of Al₂O₃
The molar ratio of Al₂O₃ to Al is 2:4.
0.335 mol Al₂O₃ × (4 mol Al/2 mol Al₂O₃) = 0.670 mol Al
What should a student do to set a goal? Check all that apply.
Create a plan.
Make a schedule.
Schedule lots of tasks.
Rush into the goal.
Pace him or herself.
Answer:
create a plan
the ways of of a student to set a goal
1. Write clear and measurable goals
2.Create a specific plan for each goal
3.Read your goals daily and visualize yourself accomplishing them
4. Reflect yourself to see if you are on target
5. Revise your action plans if needed.
1.)make a plan
2.)make a schedule
5.)pace him or herself
what is the empirical formula of A compound is found to contain 39.12 % carbon, 8.772 % hydrogen, and 52.11 % oxygen by mass.
Answer:
C₃H₈O₃
Explanation:
Let's assume we have 100 g of said compound. Then we would have:
39.12 g of C8.772 g of H52.11 g of ONow we convert those masses into moles, using their respective atomic weights:
C ⇒ 39.12 g ÷ 12 g/mol = 3.26 mol CH ⇒ 8.722 g ÷ 1 g/mol = 8.722 mol HO ⇒ 52.11 g ÷ 16 g/mol = 3.26 mol OThen we divide those moles by the smallest number among them:
C ⇒ 3.26 mol C / 3.26 = 1H ⇒ 8.722 mol H / 3.26 = 2.68O ⇒ 3.26 mol O / 3.26 = 1Finally we multiply those numbers by 3, so as to convert the 2.68 of H into an integer:
C ⇒ 1 * 3 = 3H ⇒ 2.68 * 3 = 8O ⇒ 1 * 3 = 3Thus the empirical formula is C₃H₈O₃
Explain how balancing
chemical equations with
coefficients conserve the
mass in a reaction.
grams can be converted to moles and vice versa which conversion factors is/are used for this
Answer:
Converting Grams to Moles of an Element and Vice Versa.
We can convert back and forth between grams of an element and moles.
The conversion factor for this is the molar mass of the substance. The molar mass is the ratio giving the number of grams for each one mole of the substance
molar mass is the factor
Grams can be converted to moles and vice versa so the conversion factor which is used for this is molar mass.
How do we convert mass into moles?Mass of any substance will be converted into moles by using the below equation:
n = W/M, where
n = moles
W = given mass
M = molar mass
By using the above formula we can convert the mass of any object to moles and moles to mass.
Hence conversion factor which is used for this is molar mass(M).
To know more about mass & moles, visit the below link:
https://brainly.com/question/24639749
#SPJ2
Which of the following is the best example of a heat conductor?
A
a plastic cup
B
a wooden chair
C
a fabric potholder
D
a metal frying pan
Answer:
hope it helps you
Explanation:
i think is d
Ti(SO4)2 chemical compound?
Answer:
Titanium(IV) Sulfide
Explanation:
Water in the atmosphere is a gas. When the air cools, water may condense into clouds. Then it may become a liquid or a solid and fall back to the surface of the Earth.
Water that falls from clouds is called
A.
precipitation.
B.
evaporation.
C.
groundwater.
D.
the water cycle.
Answer:
A precipitation is answer
What are 3 characteristics of all invertebrates
Answer:
None have backbones
No cell walls
Multicellular
Includes radial or bilateral body symmetry.
Explanation:
Based on the concept of the global conveyor belt, what happens to ocean water as it moves from Antarctica to the equator?
a It transfers thermal energy to deeper layers of the ocean.
b It becomes less dense and rises to the surface.
c It transfers thermal energy to the area, warming the equatorial waters.
d It becomes more dense and sinks to the ocean bottom.
Answer:
c
Explanation:
The ocean water transfers thermal energy to the area, warming the equatorial waters. Therefore, the correct option is option C.
What is thermal energy?In physics and engineering, the phrase "thermal energy" is thrown around in a lot of different situations. It can relate to a variety of distinct physical notions. They include radiation and a body of matter's inherent energy, also known as enthalpy.
Through means besides just thermodynamic work or the movement of matter, including such conduction, radiation, or friction, heat is energy that is moved into or out of a thermodynamic system. Heat is not a property of any single system or something that is "contained" within it; rather, it is a quantity that is transmitted across systems. Internal energy and enthalpy, on the other hand, are characteristics of a single system. The ocean water transfers thermal energy to the area, warming the equatorial waters.
Therefore, the correct option is option C.
To know more about thermal energy, here:
https://brainly.com/question/30819997
#SPJ7
A chemist prepares a solution of barium acetate BaCH3CO22 by weighing out 52.9g of barium acetate into a 100.mL volumetric flask and filling the flask to the mark with water. Calculate the concentration in /gL of the chemist's barium acetate solution. Round your answer to 3 significant digits.
Answer:
529g/L
Explanation:
The concentration in chemistry is defined as the amount of solute in a determined amount of solution. The concentration in g/L means the amount of grams of solute (In this case, barium acetate), per liter of solution.
To solve this problem we need to find grams of solute (52.9g, already given) and the volume in liters (Converting 100mL to liters):
Volume:
100mL * (1L / 1000mL) = 0.100L
And concentration in g/L is:
52.9g / 0.100L =
529g/LWhich group in the periodic table contains the three elements with the highest electrical conductivities?
A. Group 8
B. Group 12
C. Group 11
D. Group 7
Answer:
C Group 11
Explanation:
Group 11, by modern IUPAC numbering, is a group of chemical elements in the periodic table, consisting of copper (Cu), silver (Ag), and gold (Au).
These elements show highest electrical conductivity.
Answer:
C Group 11
Explanation:
Group 11, by modern IUPAC numbering, is a group of chemical elements in the periodic table, consisting of copper (Cu), silver (Ag), and gold (Au).
These elements show highest electrical conductivity.
Explanation: