Answer:
You will be able to watch the slow dissolution of the nail (probably a steel nail and not iron) and the change in colour of the solution.
Explanation:
I believe not 100% sure.
A constant current of 0.350 A is passed through an electrolytic cell containing molten CrCl₂ for 21.7 h. What mass of Cr(s) is produced? The molar mass of chromium is 52.0 g/mol. Provide your answer rounded to 3 significant digits.
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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How are sensible heat and latent heat different
Which of the following amines has the lowest boiling point?
a. C4H9NH2
w
O b. C2H5NHC2H
O c. C2H5N(CH3)2
O d. C3H7NHCH3
Its b beacuse if you C4 its a high active poly faber
Explanation:
Im right
What happens when a piece of vulcanized rubber is soaked in solvents: ether, n-hexane, gasoline?
Answer:
The chemical equation when Hexane is subjected to strong heat in the absence of air
Please help with my Chem101 hw
hydrogen chloride(hydrogen, and chlorine
Why is Iceland spreading apart? Be specific and detailed.
Answer: movement of Tectonic plates
Explanation: The tectonic plates are moving apart, on to the west and one to the east. As the plates move apart, volcanoes erupt and rift valleys are filled. During these events, earthquakes are common and magma rises up, creating a new oceanic crust.
our energy supply is running out
The statement that our energy supply is running out is false in accordance with the law of conservation of energy.
What is the law of conservation of energy?The law of conservation of energy states that the energy possessed by an object or physical body can neither be created nor destroyed, but it can only be transformed from one form of energy to another.
This ultimately implies that, we cannot run out of energy supply because the energy we generate from any source can't be destroyed in accordance with the law of conservation of energy.
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The heat of vaporization is 540 calories per gram. What is the minimum number of
calories needed to change 40.0 grams of water
at 100°C to steam at the same temperature and
pressure?
The minimum number of calories needed to change 40 g of water at 100°C to steam is 21600 calories
Data obtained from the question Mass of water (m) = 40 gHeat of fusion (ΔHv) = 540 cal/gHeat (Q) =?The heat needed to vaporise the water at 100 °C can be obtained as follow:
Q = m × ΔHv
Q = 40 × 540
Q = 21600 calories
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Gastric acid plays a key role in the digestion of proteins by activating digestive enzymes and often has a pH value in the range of 1.5 to 3.5. If the pH of the acid at a given time is found to be 1.25, calculate the molarity of the gastric acid juice.
If the pH of the acid at a given time is found to be 1.25, then the molarity of the gastric acid juice is 0.056M.
What is pH?pH is define as the negative logarithm of the concentration of H⁺ ions present in any solution and it will be represented as:
pH = -log[H⁺]
Concentration will be present in the form of molarity and pH value for gastric acid is given 1.25 means it is strong acid as it completely dissociates into their ions.
Required equation for calculation will be:
[H⁺] = [tex]10^{-pH}[/tex]
[H⁺] = [tex]10^{-1.25}[/tex]
[H⁺] = 0.056 M
Hence molarity of the gastric acid juice is 0.056M.
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Why are metals so ductile?
Answer:
throughout the metallic structure allowing the atoms to slide past each other. This sliding is why metals are ductile and malleable. Ionic compound must break bonds to slide past one another, which causes the ionic material to split and crack.
Explanation:
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Question 2 of 30
A pamphlet about a fuel that contains up to 15% ethanol claims that the fuel
produces less of some types of pollution. The amount of ethanol in the fuel
and the pollutants are regulated by the government. What can you not infer
from this information?
Answer:
the awnser is d the other fuel produce more pollutants
Explanation:
because right out the bat we know that other fuels produce more than a 15 percent fuel so the right awnser is d
Four friends are at the beach on a sunny day they noticed the sand is much warmer than the ocean water they wondered that the temperature of these surfaces differed even though they were exposed to the same amount of sunlight
Answer:
The sand is much warmer than the water because water has a higher specific heat, or it takes more energy to change the temperature of water. Since they are absorbing energy from the same place, the sun, the sand will get warmer faster because it takes less energy to change the temperature.
Another reason could be because the water is constantly mixing with the water below it which is not exposed to the sun and because of this the water remains at a lower temperatre. The sand however has the same part exposed to the sun unless an external force, a foot, umbrella, wind, etc comes to move it. So it is able to absorb the sun for longer than the water.
need help please :'((((((((((
Answer:
you work out the moles by finding the grand formula mass them you divide the actual mass by the grand formula mass: 25/160 (my grand formula mass is probably slightly different from yours) which I got 0.15625 then I times it by 32(O2) and I got 5. but my periodic table is different. it's whole numbers. ;-)
Explanation:
4.44
Why is there an imbalance in the carbon cycle?
You are enjoying an ice cream cone on a warm Arizona summer day. As you eat the ice cream cone, drops of melted ice cream fall to the ground.
Explain how gravitational potential energy, kinetic energy, and heat are involved in this scenario.
Answer in complete sentences.
Answer:
the ice cream falls down..therefore, it's kinetic energy while the melting part is heat energy
the force that holds the atoms together is referred to as a
As the chain length of a hydrocarbon is increased the heat of vapourization
increases because
Select one:
O a. the molecules have greater weight
O b. there are more hydrogens available for hydrogen bonding
c. the number of dipole-dipole interactions increases
O d. the strength of the London forces increases with molecular size
the carbon-carbon bonds become more polar
Answer:
Answer is d, strength of London forces increases with molecular size.
Explanation:
Dispersion forces are the forces preesnt between all intermingling atoms, molecules and particles. Dispersion forces are the weakest intermolecular force, but they build up with the addition of more atoms, molecules or particles. Heat of vapourisation or boiling point is dependant on the energy required to break the bonds within the molecule/hydrocarbon in question. The build up of dispersion forces create greater intermolecular forces, which make the boiling of a substance more difficult. Hence increased hydrocarbon chain length, and the related increased eat of vapourisation is due to how the strength of the London/Dispersion forces increases with molecular size
The Second Law of Thermodynamics states that:
Select one:
Answer:
In the total entropy of an isolated system, the thermal energy per unit temperature that is unavailable for doing useful work can never decrease.
What causes the change in pressure when a basketball is pumped up?
Answer:The more air we pump into them the more squished the air has to become to fit inside the ball. As the air becomes more squished, it pushes more on the inside of the ball. When you have a ball which is more inflated, there is more force pushing on the inside of that ball. (We call that air pressure).
Explanation:
The amount of gas causes the change in pressure when a basketball is pumped up. The force delivered perpendicularly to an object's surface per unit area across where that force is dispersed is known as pressure.
What is pressure?The force delivered perpendicularly to an object's surface per unit area across where that force is dispersed is known as pressure (symbol: p / P). The pressure proportional to the surrounding air is known as gauge pressure, also spelt gauge pressure[a].
Pressure is expressed using a variety of units. Some of them come from dividing a unit of force by a measure of area; the pound-force / square inch and the newton every square metre (N/m2) are two examples. The standard international measurement of pressure, a pascal (Pa), is another. The amount of gas causes the change in pressure when a basketball is pumped up.
Therefore, the amount of gas causes the change in pressure when a basketball is pumped up.
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Convert 55 m3 to liters
Explanation:
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HELP ASAP FOR MY SISTER SCIENCE
Answer:
B.) an elephant having the same trunk sizes and shapes as its parents
Explanation:
an inherited trait is genetically determined. inherited traits are coded in our DNA and hence can be passed on to the next generation.
What is an example of equilibrium?
O the release of a gas product from an open system
O the partial dissolution of salt crystals in saturated water
O the combustion of gasoline in a car engine
O the mixing of oil and water in a closed container
A good example of equilibrium would be the mixing of oil and water in a closed container.
What is chemical equilibrium?Chemical equilibrium is a condition in which the concentrations of components of a chemical reaction remain unchanged and have no tendency to change.
Of all the options, the only one where the concentrations of the component reactants cannot change is a mixture containing oil and water in a closed container.
Oil and water are immiscible and thus, their concentrations remain constant.
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Why can light be treated like a particle?
O A. Some wavelengths are visible and some are not.
B. Light comes in chunks of energy called photons.
C. Light waves can bounce off of some surfaces.
D. Light can be separated into a spectrum of colors.
A light can be treated like a particle because light comes in chunks of energy called photons.
What are photons?Photons are the small packets of energy and its energy will be represented by the following equation as:
E = hυ, where
h = plank's constant
υ = frequency
Light will be treated like a wave as well as of particle due to presence of this type of energy.
Hence correct statement is light comes in chunks of energy called photons.
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Answer:
B. Light comes in chunks of energy called photons.
Matter is made of atoms that have positive centers of neutrons and protons
surrounded by a cloud of negatively charged electrons.
This statement is...
Question
Why does corn pop in the microwave?
Answer:
it pops because the heat and water inside of it
Explanation:
Answer:
when the corn is heated, the water turns into steam, which builds pressure inside the kernel. When it can no longer contain the pressure it pops.
Explanation:
What’s the answer???????#15
Answer:
C.They are only magnetic if an electric current is running through them
Explanation:
Electromagnets are conductors which develop a magnetic field due to the electrons flowing through them. If the flow of electric current stops, the motion of the electrons stop and they do not generate their magnetic fields.
Consider the following equilibrium: HCOOH(aq) + H2O(l) ↔ HCOO-(aq) + H3O+(aq). How will the addition of a small amount of NaOH affect the equilibrium?
A. It will shift to the left.
B. It will shift to the right.
C. It won't be affected.
D. More information is needed.
Which are the correct products for these reactants HCl + NaOH -->
The products obtained from the reaction between HCl and NaOH are NaCl and H₂O
What is a chemical equationChemical equations are representations of chemical reactions using symbols and formula of the reactants and products.
The reactants are located on the left side while the products are located on the right side.
Reactants —> Products
The balancing of chemical equations follows the law of conservation of matter which states that matter can neither be created nor destroyed during a chemical reaction but can be transferred from one form to another.
How to write equationThe reaction between HCl and NaOH is a neutralization reaction which produces salt and water as shown below
HCl + NaOH → NaCl + H₂O
Products => NaCl and H₂O
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how many mm Hg is 0.751 atm
Answer:
570.76 mmHg
Explanation:
multiply the atm value by 760.0 mmHg / atm.
760*.751=570.76
chemteaminfo
The reaction of aluminum with chlorine gas is shown.
2Al+3Cl2⟶2AlCl3
Based on this equation, how many molecules of chlorine gas are needed to react with 20 aluminum atoms?
number of Cl2 molecules:
How many units of aluminum chloride (AlCl3) can be produced from 20 aluminum atoms?
number of AlCl3 units:
Answer:
See below
Explanation:
The equation shows Al / Cl = 2/3 or 3/2 Al = Cl
3/2(20) = 30 Cl atoms needed
The equation shows a one-to-one relationship between Al and AlCl3
produced so if you use 20 Al atoms you get 20 AlCl3 molecules
The number of Cl₂ molecules needed to react with 20 aluminum atoms is approximately 11.97, and the number of units of aluminum chloride (AlCl₃) produced from 20 aluminum atoms is approximately 9.98.
Let's first calculate the number of molecules of chlorine gas (Cl₂) needed to react with 20 aluminum (Al) atoms:
From the balanced chemical equation: 2Al + 3Cl₂ ⟶ 2AlCl₃
The stoichiometric ratio between aluminum and chlorine gas is 2:3. This means for every 2 moles of aluminum, we need 3 moles of chlorine gas.
1 mole of any substance contains Avogadro's number (6.022 × 10²³) of particles (atoms, molecules, or ions).
Number of moles of aluminum (Al) atoms = 20 atoms / Avogadro's number
Number of moles of aluminum (Al) atoms = 20 / 6.022 × 10²³
Now, to find the number of molecules of chlorine gas (Cl₂) needed, we use the stoichiometric ratio:
Number of moles of chlorine gas (Cl₂) needed = (3/2) × Number of moles of aluminum (Al) atoms
Number of moles of chlorine gas (Cl₂) needed = (3/2) × (20 / 6.022 × 10²³)
Number of moles of chlorine gas (Cl₂) needed ≈ 1.988 × 10⁻²³ moles
Since 1 mole of any substance contains Avogadro's number of molecules, the number of molecules of chlorine gas (Cl₂) needed will be approximately:
Number of Cl₂ molecules ≈ 1.988 × 10⁻²³ × 6.022 × 10²³ ≈ 11.97
Now, let's calculate the number of units of aluminum chloride (AlCl₃) that can be produced from 20 aluminum (Al) atoms:
From the balanced chemical equation: 2Al + 3Cl₂ ⟶ 2AlCl₃
The stoichiometric ratio between aluminum and aluminum chloride (AlCl₃) is 2:2. This means for every 2 moles of aluminum, we get 2 moles of aluminum chloride.
Number of moles of aluminum chloride (AlCl₃) produced = Number of moles of aluminum (Al) atoms / 2
Number of moles of aluminum chloride (AlCl₃) produced = 20 / 2 / Avogadro's number
Number of moles of aluminum chloride (AlCl₃) produced ≈ 20 / (2 × 6.022 × 10²³)
Number of moles of aluminum chloride (AlCl₃) produced ≈ 1.658 × 10⁻²³ moles
Since 1 mole of any substance contains Avogadro's number of units (molecules or formula units), the number of units of aluminum chloride (AlCl₃) produced will be approximately:
Number of AlCl₃ units ≈ 1.658 × 10⁻²³ × 6.022 × 10²³ ≈ 9.98
Therefore, the number of Cl₂ molecules needed to react with 20 aluminum atoms is approximately 11.97, and the number of units of aluminum chloride (AlCl₃) produced from 20 aluminum atoms is approximately 9.98.
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