Answer:
1. 0.56 mole of electron.
2. 0.28 mole of Co .
3. 16.52g of Co.
Explanation:
The following data were obtained from the question:
Current (I) = 15A
Time (t) = 1 hr = 1 x 60 x 60 = 3600secs
Next, we shall determine the quantity of electricity, Q flowing in electrolyte. This is illustrated below:
Quantity of electricity (Q) = current (I) x Time
Q = It
Q = 15 x 3600
Q = 54000C.
1. Determination of the moles of electrons used to electrolyzed the solution. This is illustrated below:
96500C = 1 mole of electron
Therefore, 54000C = 54000/96500 = 0.56 mole of electron.
Therefore, 0.56 mole of electron was used to electrolyze the solution.
2. Determination of the number of mole of Co produced at the cathode. This is illustrated below:
At the cathode:
Co2+ + 2e —> Co
From the balanced equation above,
2 moles of electron produce 1 mole of Co.
Therefore, 0.56 mole of electron will produce = 0.56/2 = 0.28 mole of Co.
Therefore, 0.28 mole of Co is produced at the cathode.
3. Determination of the mass of Co produced at the cathode. This can be achieved by doing the following:
Molar mass of Co = 59g/mol
Number of mole of Co = 0.28 mole
Mass of Co =..?
Mass = mole x molar mass
Mass of Co = 0.28 x 59
Mass of Co = 16.52g
Therefore, 16.52g of Co is produced at the cathode.
Which body system processes food into a useable source of energy?
Answer:
Glucose, found in the food animals eat, is broken down during the process of cellular respiration into an energy source called ATP. When excess ATP and glucose are present, the liver converts them into a molecule called glycogen, which is stored for later use.
A car travelling at 20km per hour emits about 0.0750kg of carbon monoxide per kilometre. How many mole of carbon monoxide are emitted per kilometre under these conditions?
Answer:
2.67761514 moles
Explanation:
0.075kg equates to 75g.
This means that the car emits 75g of CO per km.
dividing 75g by the molar mass of CO (28.01g/mol) we get 2.67761514 moles
the kidneys in human beings are a part of the system for
Which elements are diatomic?
Answer:The elements hydrogen, nitrogen, oxygen, fluorine, chlorine, bromine and iodine are diatomic elements
Definition of diatomic elements:Diatomic elements are special as the atoms that form it do not like to be alone. That is, you will never find a nitrogen or fluorine atom, for example, hanging out solo. Rather, these atoms will always be paired together because they need to pool resources to have enough electrons.
Answer:
H2, O2, N2, F2, Cl2, Br2, I2
Explanation:
These occur naturally has molecules of 2 atoms.
They are all gases except Br2, liquid and iodine which is solid.
what a neat and well labelled diagram of nitrogen cycle in nature
Answer:
In the picture.
I hope it helps
Explanation:
Nitrogen cycle is a complex process (or sequence of reaction) by which nitrogen is removed and added to the soil.
Calculate the percentage of all elements in Fel(OH)3
Please help, I will mark the answer with brainlist...
Answer: 30.06% is your answer.
I hope this helps.
Stay safe and have a good day :D
What are the two ways that humans lose heat? PLS help thank you!
Answer:
Evaporation, Radiation
Explanation:
Evaporation of water from your skin if it is wet (sweating). ...
Radiation (similar to heat leaving a woodstove).
How are ironic bonds and covalent bonds different and how are they different?
A 315-mL bag of potato chips is packaged at sea level (1.00 atm) where the temperature is 25oC. If this bag of chips is transported to Denver (where the pressure is 0.775 atm and the temperature is 18oC), what will the new volume of the bag be?
Answer:
THE NEW VOLUME AT A PRESSURE OF 0.775 atm AND TEMPERATURE OF 18 °C IS 0.397 L
Explanation:
Using the combined gas equation
P1V1/T1 = P2V2/ T2
P1 = 1 atm
VI = 315 mL = 315 / 1000 L = 0.315 L
T1 = 25°C 25 + 273 K = 298 K
P2 = 0.775 atm
T2 = 18 °C = 18 + 273 K = 291 K
V2 = Unknown
Substituting the values into the equation, we obtain:
V2 = P1V1 T2/ P2 T1
V2 = 1 * 0.315 * 291 / 0.775 * 298
V2 = 91.665 / 230.95
V2 = 0.3969 L
The new volume at the given change in conditions is 0.397 L
Which set of phrases best lists the characteristics of asexual reproduction?
one parent, offspring are not identical to the parent
one parent, offspring are identical to the parent
two parents, offspring are not identical to the parents
two parents, offspring are identical to the parents
I need this answer fast ASAP.
Answer:
one parent, offspring are identical to the parent
Explanation:
Answer:
one parent, offspring are identical to the parent
Explanation:
asexual reproduction is a form of reproduction that does not require two gametes to fuse. Asexual reproduction results in offspring that are known as stable clones, meaning that their genetic makeup is stable and doesn't change between generations
PLEASE HELP!!!
Design criteria are the desired features of a design. Identify at least two criteria for the design of the ammonia-making process. Explain why these criteria are important.
Answer:
Two design criteria for the design of the ammonia making process are;
1) Sustainable hydrogen production by renewable energy
2) Sustainable use of the ammonia-water thermal absorption cycle to retrieve the ammonia present in the waster water
Explanation:
Ammonia is produced from natural gas in the following process;
H₂ + RSH → RH + H₂S
H₂S + ZnO → ZnS + H₂O (Waste water)
CH₄ + H₂O → CO + 3H₂
CO + H₂O → CO₂ + H₂
Ammonia is then produced by reacting the produced hydrogen with nitrogen in the presence of a catalyst in a process known as the Haber-Bosch process as follows;
3H₂ + N₂ → 2NH₃
The
The design criteria for the design of the ammonia making process therefore as follows;
1) Sustainable use of renewable energy to produce hydrogen gas from the electrolysis of water
2) Use of the ammonia-water thermal absorption cycle to retrieve the ammonia present in the waster water.
The branch of science which deals with chemicals and their bond is called chemistry.
The two ways by which we can design ammonia making process is as follows:-
Two design criteria for the design of the ammonia making process are:-
Sustainable hydrogen production by renewable energy .The conversion of urea for the production of ammonia.
The usage of ammonia is important in these ways:-
They act as a fertilizer which helps to boost the growth of plants.They act as a poison to humans and many animals, so we have to extract it and handle it with care.Ammonia is also used as an inflammable gas.Hence, these are the design for the ammonia-making process.
For more information, refer to the link:-
https://brainly.com/question/19524691
quick question plz . .....Which one of the following is acidic oxide?
A. K2O
B. CO2
C. MgO
D. Al2O3
Answer:
B
Explanation:
its an acidic oxide, it disolves in water to form carbonic acid which is an acid
In the Lewis dot structure for H2CCH2, how many bonds are between the carbon atoms?
3
4
1
2
Answer:
2
Explanation:
The compound H2CCH2 has the condensed formula C2H4. The name of the compound is ethene. The compound is unsaturated, that is, it contains multiple bonds. The compound has a formula which fits into the general molecular formulae of alkenes (olefins) which his CnH2n.
Olefins have a double bonds between the carbon atoms. That is , the two carbon atoms in Olefins are connected via a double covalent bond. This now implies that the two carbon atoms in ethene (C2H4) are connected by two covalent bonds in the lewis structure of the molecule as is common for Olefins.
In the Lewis dot structure for [tex]\rm H_2CCH_2[/tex], there is one covalent bond present between the carbon atoms. The correct answer is option c.
A dot structure is a method of depicting an atom's valence electrons by placing dots around the atomic symbol. One valence electron is represented by each dot.
In the Lewis dot structure of [tex]\rm H_2CCH_2[/tex], there is one bond between the carbon atoms. This is because each carbon atom has two electrons in its valence shell, and each hydrogen atom has one electron in its valence shell.
The two carbon atoms share two electrons to form one covalent bond, and each carbon atom also shares one electron with a hydrogen atom to form two additional covalent bonds.
Therefore, the correct answer is option c. There is one bond (covalent bond) between the carbon atoms in the Lewis dot structure for [tex]\rm H_2CCH_2[/tex].
Learn more about dot structure here:
https://brainly.com/question/28652824
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Name the process that releases carbon dioxide into the atmosphere.
Diagrams, tables, and graphs are used by scientists to
Answer:
Since most of the data scientist collect is quantitative, data tables and charts are usually used to organize the information • Graphs are created from data tables • hope that helps love!
What are the 5R principles of which we can make a difference in our environment?
Answer:
The 5R's are Reuse, Reduce, Recycle, Repair and Recover.
What is the normal boiling point of of a solution containing 64.5g of non volatile quinoline ( MW 129 ) in 500 g of benzene when the normal boiling point is 80.10 and KB = 2.50
Answer:
THE NORMAL BOILING POINT OF A SOLUTION CONTAINING 64.5 g OF QUINOLINE IN 500 g OF BENZENE IS 82.6 C
Explanation:
Boiling point = old boiling point + molarity * boiling point constant (Kb)
First, you calculate the number of moles of quinoline in the solution
number of moles = mass / molar mass
Since the molar mass of quinoline has been given as 129 g/mol
number of moles = 64.5 g / 129 g/mol
number of moles = 0.5 moles.
Next is to determine the molarity:
molarity = number of moles of solute / kilogram of solvent
molarity = 0.5 moles / 500/1000 kg
molarity = 0.5 / 0.5
molarity = 1 M
The new boiling point can then be calculated using the formula:
B. P = old B.P + Kb * molarity
B.P = 80.10 + 2.50 * 1
B.P = 80.10 + 2.50
B.P = 82.6 degree celsius
What is the molarity of a solution that contains 2 moles of KCl in 4 L of solution? a 2.0 M b 0.5 M c 0.25 M d 8.0 M
Answer:
A.) 2.0 M
Explanation:
Molarity=mole of solutes/Liters of solution so M=mol/L
2moles/4 L =2 M
What are the conditions for evaporation?
Answer:
For evaporation you need a warm, preferably humid temperature. The rate of evaporation increases with an increase in temperature. A windy climate is best, as wind helps to remove the evaporated water vapour, and therefore creating a better scope for evaporation to continue. The speed of wind is important for evaporation because the wind pulls in dry air, increasing the rate of evaporation.
Short Answer- Hot and humid temperature, lots of wind speed.
Answer:
Explanation:
1 Evaporation is the phase change of a liquid to a gas. There are three very important requirements for evaporation to take place, 1) available energy, 2) available water, and 3) a vertical moisture gradient. Approximately 600 calories of heat must be added to a gram of water for it to evaporate into the air.
2. Evaporation is the process of a substance in a liquid state changing to a gaseous state due to an increase in temperature and/or pressure. It is a fundamental part of the water cycle and is constantly occurring throughout nature.
3.Water evaporates faster if the temperature is higher, the air is dry, and if there's wind. The same is true outside in the natural environment. Evaporation rates are generally higher in hot, dry and windy climates.
thank u
to the
of the substances.
DONE
Answer
what do you mean?
Explanation:
im confused
Answer:
Sorry. I don't understand
Explanation:
what happens to particles during a physical change?
Answer:
im pretty sure they heat up
Explanation:
as they use energy to go from solid to liquid to gas, they need heat to do so as they have a melting and boiling point
Identify what is in that photo please!! (10 pts)
Answer:
Electromagnet
Explanation:
You make an iron (II) sulfate solution with a molarity of 2.1 M. If the solution is 500 mL total, how many grams of iron (II) sulfate is that?
Answer:
Explanation:
2.1>1000
?>500
(500×2.1)÷1000=1.05moles
Mass= molesx molar mass
1.05×(56+32+(16×4))
1.05×152=159.6g
to well
Which of the
of the following is a way to use
water economically
a construction of bewris
b Rainwater harvesting
c Drup irrigation
d Infitration
Answer:
c Drup irrigation
Explanation:
Hope it helps you.
Plz mark as brainliest plz.
Which factor affects gravitational potential energy but not elastic potential energy?
Answer:
spring constant. acceleration due to gravity. distance from a given position. amount of matter in the object.
Explanation:
hope this helps you :)
Answer:
spring constant
Explanation:
Which evidence would most strongly indicate that a chemical change is
taking place?
A. Fizzing
B. Changing shape
C. Breaking
D. Changing state
Why do scientists consider humans to be "carbon creatures"?
PLEASE HELP ME
Answer:
Scientists consider human to be" carbon creatures" because carbon atoms form the backbone or foundation of pretty much the essential biological molecules floating around in our bodies (except water, of course.) All in all, scientists can consider humans to be " carbon creatures" because our skin, hair and cells are all made out of molecules that contain huge amounts of carbon.
Hope this helps! God bless!
Which material is most likely to be a base?
salt water
vinegar
coffee
orange juice
Answer:
Cooffee
Explanation:
the answer is coffee because coffee might be bitter
Answer:Coffee
Explanation:Water is neutral, while the other answers are mostly organic acids but salt water is neither acidic nor basic
what is chemistry?
Answer:the branch of science which examines the material of the universe and changes that these materials undergo
Chemistry deals with composition,structure,properties of matter and changes that these materials undergo
Identify this molecule
Answer:
Ribose
Explanation:
This is the pentose sugar found in RNA commonly.
