Answer:
The coefficients in a chemical equation represent the relative number of moles of each reactant and product that interven in the chemical reaction.Explanation:
The coefficients are the numbers that you put in front of each chemical formula that represents the reactants and products in the chemical equation. They indicate the mole ratio in which the elements or compounds react to form the products, as per the chemical equation.
See an example:
Word equation: hydrogen and oxygen produce waterChemical (skeleton) equation: H₂ (g) + O₂(g) → H₂O (g)This equation is not balanced: the number of atoms of oxygenin the reactant side is 2 while the number of atoms of oxygen isn the product side is 1. In order to balance the equation you need to add some coefficients.
When no coefficients are shown it is understood that the coefficient is 1.
Balanced chemical equation: 2H₂ (g) + O₂(g) → 2H₂O (g)The coefficients 2 in front of H₂ and 1 (understood) in front of O₂, in the reactant side, and 2 in front of H₂O, in the product side, balance the equation.
Those coefficients mean that the 2 molecules (or mole of molecules) of H₂ react with 1 molecule (or mole of molecules) of O₂ to form 2 molecules (or moles) of H₂O (product side).
That is the mole ratio: 2 H₂ : 1 O₂ : 2 H₂O.
Notice that, in spite of the aboslute numbers may change, the mole ratio is unique for any chemical reaction. For example 4 : 2 : 4 is the same ratio that 2 : 1 : 2, or 8 : 4 : 8, but the most common practice is to use the most simple form of the ratio, i.e. 2: 1: 2.
The representation that coefficients that are found in a chemical equation provide, is : number of moles that is present in the reactants as well as products.
The coefficients of the equation helps to know the number of moles that is present in reactants as well as products in a balanced equation.If the equation is not balanced, then it needs to be balanced first, with information of the coefficients, it is possible to calculate components of reactants as well as the products that is taking part in the chemical reaction.Learn more at:
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Distinguish between a solution in general and an aqueous solution
Answer:
What distinguish a solution in general from an aqueous solution is the solvent. A solution in general may contain any solvent, which may be solid, liquid or gas, while an aqueous solution is formed with water as solvent.Explanation:
A solution in general is a homogeneous mixture in which a substance, named solute, is dissolved, in other substance, name solvent.
Solutions may be in solid, liquid or gas state. There are many kind of solvents. Usually, in a lab you work with liquid solutions. Some liquid solvents are: ethanol, glycerin, hexane, benzene, and water, among many others.
Aqueous solution is a solution where the solvent is water. Of course, the solute may be any one: NaCl, sugar, ethanol, an acid, a base, a salt.
What distinguish a solution in general and an aqueous solution is the solvent.
Which of these is the percent of error in evaluating the molecular mass of a compound if the experimental value was 105.2 amu and the known value was 107.5 amu? f 2.1% g 4.2% h 3.3% j 1.0%
Answer:
The percent error, % error, is 2.1% (option f)Explanation:
1) Data:
a) Experimental value, m₁ = 105.2 amu
b) Known value, m = 107.5 amu
b) % error = ?
2) Formulae:
a) absolute error = | experimental value - known value|
b) % error = [ absolute value / known value ] × 100
3) Solution:
a) absolute error = | m₁ - m | = | 105.2 amu - 107.5 amu | = 2.3 amu
b) % error = [ 2.3 amu / 107.5 amu ] × 100 = 2.1% ← answer
a beaker contains 500ml of 12m potassium nitrate .what is the molarity of the new solution if 250 ml more water is added
Answer:
8.0 M.
Explanation:
It is known that the no. of millimoles after dilution is equal to the no. of millimoles before dilution.∴ (MV) of KNO₃ before dilution = (MV) of KNO₃ before dilution.
Before dilution:
M = 12.0 M, V = 500.0 mL.
After dilution:M = ??? M, V = 500.0 mL + 250.0 mL = 750.0 mL.
∴ M after dilution = (MV) before dilution / (V) after dilution = (12.0 M)(500.0 mL)/(750.0 mL) = 8.0 M.
R-12 should be recycled instead of vented to the atmosphere because
A. recycling companies offer large financial incentives.
B. it has been proven to deplete the Earth's ozone layer.
C. R-12 is expensive.
D. R-12 is unstable.
I believe is B if not then it's A
Answer:
Option (B)
Explanation:
R-12 is known as the Dichloro-difluoro-methane and it is a colorless gas. It is was earlier used in the refrigerators, vehicles air conditioning, and aerosol spray. The use of this R-12 was found to be depleting the ozone layer which was not a positive effect on the earth. Due to this, the use of this gas was banned and alternative energy resources were used. Its products containing this R-12 gas were not expensive and they were stable enough.
Hence, the correct answer is option (B).
The table shows the characteristics of four substances after they are placed in water.
Substance
Ion concentration
Electrical conductivity
W
Medium
Good
X
Low
Poor
Y
High
Excellent
Z
None
None
Which compound is most likely the strongest electrolyte?
W
X
Y
Z
Answer:
Electrolytes are chemicals that break into ions (ionize) when they are dissolved in water. The positively-charged ions are called cations, while the negatively charged ions are called anions.
Strong electrolytes completely ionize in water. This means 100% of the dissolved chemical breaks into cations and anions.
Weak electrolytes partially ionize in water. Pretty much any dissociation into ions between 0% and 100% makes a chemical a weak electrolyte, but in practice, around 1% to 10% of a weak electrolyte breaks into ions.
If a substance doesn’t ionize in water at all, it’s a nonelectrolyte.
Explanation:
The substance that serves as a good electrolyte in the list is the substance labelled Y.
What is an electrolyte?An electrolyte is a solution that conducts electricity by the movement of ions in the solution. The high concentration of ions in the electrolyte implies that it has a good conductivity
Hence, the substance that serves as a good electrolyte in the list is the substance labelled Y.
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What is the best explanation for why electrolyte solutions conduct electricity?
The answer is: the presence of free-flowing ions. Explanation: ionic compounds dissociate in water forming a solution with free ions.
Explain why the pbcl2 dissolved when water was added
PbCl2 would not dissolve because it is insoluble based on the solubility rules for substances that will dissolve in water. This compound would instead form a solid precipitate at the bottom of the container.
PbCl2 dissolves in water as it dissociates into Pb²+ and Cl¯ ions which attract polar water molecules. Just like potassium chloride, lead(II) chloride dissolves due to hydration of ions. Solubility of PbCl2 may increase with temperature.
Explanation:When PbCl2 is dissolved in water, it dissociates into ions Pb²+ and Cl¯. These ions interact with water molecules due to the presence of polar bonds in water. Just like potassium chloride (KCl) dissolves in water by getting hydrated, or attracting water molecules, lead(II) chloride (PbCl2) dissolves in a similar fashion. Water, being a polar molecule, is attracted by the charges on both lead(II) and chloride ions. This hydration of ions is an important factor in the dissolution of many solids into liquids.
Moreover, the solubility of various solids in water tends to increase with temperature. Hence, if the PbCl2 was added to warm water, it might have increased its solubility, enabling more of PbCl2 to dissolve.
However, it is important to note that certain compounds like PbCl2 have relatively low solubility in water, and may still leave some solid undissolved even after thoroughly mixing.
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What is the equilibrium constant expression for the following reaction?
COCl2(g) = CO(g) + Cl2(g)
Keq=(COCl2)/(CO)+(Cl2)
Keq= (CO)(Cl2)/(COCl2)
Keq=(COCl2)/(CO)(Cl2)
Keq=(CO)+(Cl2)/(COCl2)
Answer:
Keq = [CO][Cl₂]/[COCl₂].
Explanation:
For the balanced reaction:
COCl₂(g) ⇄ CO(g) + Cl₂(g).
The equilibrium constant can be expressed as concentration equilibrium constant (Kc) or pressure equilibrium constant (Kp).
The equilibrium constant is the ratio of the product of products concentrations to the product of the reactants concentrations.
Keq = [CO][Cl₂]/[COCl].
How many significant figures are in 253.00 g?
There are five significant figures
Hope this helps and have a fabulous day :)
It’s five significant figures
In the reaction of sodium with bromine, explain which atom is reduced.
I need you to show ALL the steps because I don't understand.
Answer:
The reduced atom is Br.
Explanation:
The oxidation-reduction reaction contains a reductant and an oxidant (oxidizing agent). The oxidation process is the process in which electrons are lost and produce positively charged ions. The reduction process is the process in which electrons is gained and negatively charge ions are produced. In the reaction of chlorine with calcium:2Na + Br₂ → 2NaBr,
Na loses 1 electrons and is oxidized to Na⁺. (Na → Na⁺ + e).
Br₂ gains 2 electrons and is reduced to 2Br⁻. (Br₂ + 2e → 2Br⁻).
So, the reduced atom is Br.
According to the storage ladder protocol, raw meat should be stored on shelves based on its? A.Minimum internal cooking temperature. B.Expiration date C. Meat should never be stored on shelves D.Maximum internal cooking temperature
Answer:
D.Maximum internal cooking temperature
Explanation:
According to the Storage Ladder Protocol, food storage in refrigerator should have a proper rules to store them. On the top most shelf, Prepared foods should be kept. On the second shelf, Fruits and Vegetable are kept. Fish and Sea foods are kept on the third shelf. The fourth shelf is reserved for the Beef and Porks. The next shelf is for Ground Meat. The last shelf is for Poultry items. So, this proves that the Ground Beef should be stored above the Chicken. A diagram is attached below to explain the storage order in a more appropriate manner.
According to the Storage Ladder Protocol, raw meat should be stored on shelves based on its Minimum internal cooking temperature
The storage ladder protocol is a sets of rules created to make sure that varieties of unprepared and prepared food are properly stored in a refrigerator.
Further ExplanationThe storage ladder protocol is meant to determine which shelf each variety of food should be stored on and also provides a guide as to which food should be below or above.
For example, prepared food must be stored on the top shelf, Foods and vegetables are stored on the second shelf, fish and seafood should be stored on the third shelf, beef and pork should be kept on the fourth shelf, Ground meat should be stored on the fifth shelve while poultry items should be kept on the bottom shelf.
Also, to ensure proper food hygiene, make sure that the temperature of your fridge is set between 0 and 5 degrees Celsius. If the temperature is maintained within that range, it will slow down the rate at which the food gets to spoil and also prevent harmful bacteria from multiplying.
Also, do not consume any food that has passed its expiry date because it will be easy for bacteria to grow on such food.
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How should food be stored to avoid cross-contamination: https://brainly.com/question/4415007According to the storage ladder protocol, raw meat should be stored on shelves based on its? https://brainly.com/question/12570432KEYWORDS:
refrigeratorstorage ladder protocolraw meattemperaturerulesThe ph of a solution prepared by mixing 45.0 ml of 0.183 m koh and 35.0 ml of 0.145 m hcl is ________.
Answer:
12.6.
Explanation:
We should calculate the no. of millimoles of KOH and HCl:no. of millimoles of KOH = (MV)KOH = (0.183 M)(45.0 mL) = 8.235 mmol.
no. of millimoles of HCl = (MV)HCl = (0.145 M)(35.0 mL) = 5.075 mmol.
It is clear that the no. of millimoles of KOH is higher than that of HCl:So,
[OH⁻] = [(no. of millimoles of KOH) - (no. of millimoles of HCl)] / (V total) = (8.235 mmol - 5.075 mmol) / (80.0 mL) = 0.395 M.
∵ pOH = -log[OH⁻]
∴ pOH = -log(0.395 M) = 1.4.
∵ pH + pOH = 14.
∴ pH = 14 - pOH = 14 - 1.4 = 12.6.
12.6 is the pH of a solution prepared by mixing 45.0 ml of 0.183 m KOH and 35.0 ml of 0.145 m HCl.
How we calculate pH?
pH of the solution can be calculated as pH = 14 - pOH.
First of all we have to calculate the concentration of OH⁻ ions as follow:
Total volume of the solution = 45ml + 35ml = 80ml
Concentration of OH⁻ in terms of mole is calculated as:
[OH⁻]=(no. of millimoles of KOH - no. of millimoles of HCl)/Total volume
Given that, concentration of KOH = 0.183m
Volume of KOH = 45ml
Concentration of HCl = 0.145m
Volume of HCl = 35ml
Millimoles can be calculated as:
millimoles = concentration × volume
No. of millimoles of KOH = 0.183 M × 45.0 mL = 8.235 mmol
No. of millimoles of HCl = 0.145 M ×35.0 mL = 5.075 mmol
Now, [OH⁻] = 8.235 mmol - 5.075 mmol / 80.0 mL = 0.395 M
pOH = -log[OH⁻]
pOH = -log(0.395)
pOH = 1.4
Therefore, pH = 14 - 1.4 = 12.6
Hence, 12.6 is the pH of the solution.
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A stable atom that has a large nucleus most likely contains....?
A.) more neutrons than protons
B.) more protons than neutrons.
C.) equal numbers of protons and neutrons.
D.) changing numbers of protons and neutrons.
A. More neutrons than protons
it would likely include more neutrons than protons.
How many moles of helium are 8.84×10^24 atoms of He?
Answer:
14.77 mol.
Explanation:
It is known that every 1.0 mole of compound or element contains Avogadro's number (6.022 x 10²³) of molecules or atoms.Using cross multiplication:
1.0 mole of He contains → 6.022 x 10²³ atoms.
??? mole of He contains → 8.84 x 10²⁴ atoms.
∴ The no. of moles of He contains (8.84 x 10²⁴ atoms) = (1.0 mol)(8.84 x 10²⁴ atoms)/(6.022 x 10²³ atoms) = 14.77 mol.
Which of the following has the shortest wavelength?
Ultraviolet light
Visible violet light
Visible red light
Infrared light
Answer:
ultraviolet light is the shortest wavelength
Explanation:
Answer:
The correct answer is the first option: Ultraviolet light.
Explanation:
Hello!
Let's solve this!
The ultraviolet light is the one with the shortest wavelength. It is between visible light and x-rays. The place where this is seen is in the electromagnetic spectrum, which is the set of all electromagnetic waves.
Therefore, we conclude that the correct answer is the first option: Ultraviolet light.
Which grouping identifies chemical properties?A. Density, luster, boiling point B. Melting point, hardness, conductivity C. Malleability, ductility, texture D. Combustibility, flammability, reactivity
Answer:
option D. Combustibility, flammability, reactivity.Explanation:
Physical properties: characteristics of the matter that can be observed and measured by physical media, withoud changing the composition of the matter.
Typical examples of physical properties are: mass, volume, density, boiling point, melting point, hardness, specific heat.
Chemical properties: they are ability of the matter to change by decompositon or combination with other substances to produce one or more different substances. They cannot not be observed or measured without changing the composition of the orignal sample.Typical examples of chemical properties are reactivity with oxygen, reactivity with water, and any reactitivy in general.
Hence, applying those definitions to the set of choices you get:
A. Density, luster, boiling point (incorrect)
All of them are physical properties since they are observable and measurable without altering the composition of the sample.
B. Melting point, hardness, conductivity (incorrect)
They all are also physical properties. For example, melting point can be measured with a thermometer during the phase change.
C. Malleability, ductility, texture (incorrect)
Again, all physical properties. Ducitlity, for example, is the ability of the metals to form this wires.
D. Combustibility, flammability, reactivity (correct answer)
Combustibility: is the reaction with oxigen to form CO₂ and H₂OFlammability: is the ability to burn in flames, which is a chemical change.Reactivity: Already discussed.All these properties can only be measured by producing the correspondant chemical reaction (change), so they are chemical properties.
Answer:
The correct option is D
Explanation:
Which metal can be used as a sacrificial electrode to prevent the rusting of an iron pipe?
manganese The metal that is used as a sacrificial electrode to prevent the rusting of iron is manganese.
Under which set of conditions is δgrxn for the reaction a(g) → b(g) most likely to be negative?
Answer:
delta G = -ve.. This means the rxn is spontaneous
Explanation:
For spontaneous rxn
Delta H = - ve
Delta S = +ve
And no. Of moles at product side should be less than tha reactant side.
I wrote all i know.. Hope this helps you
Answer:
This question is incomplete but the completed question is below
Under which set of conditions is ΔGrxn for the reaction A(g)→B(g) most likely to be negative?
Under which set of conditions is for the reaction most likely to be negative?
(a) PA=0.010 atm; PB=0.010 atm
(b) PA=0.010 atm; PB=10.0 atm
(c) PA=10.0 atm; PB =0.010 atm
(d) PA=10.0 atm; PB =10.0 atm
The correct option is (c)
Explanation:
The Gibb's free energy (ΔG) of the reaction will be negative when the reaction is spontaneous and a reaction is said to be spontaneous when more products are been formed.
When you consider the reaction provided in the question, the "g" in bracket means gas while A represent reactant(s) and B represents product(s)
When a reaction involves gases, an increase in pressure causes more products to be formed hence the pressure on the reactant side (PA) will most likely be more than the pressure on the product side (PB). The only option that has more pressure on the reactant side (PA = 10.0 atm) than on the product side (PB = 0.010 atm) is option c.
For compounds, the basic structural unit representing the compound is the atom.
a. true
b. false
The statement provided is false; the basic structural unit of a compound is the molecule, not the atom. Molecules consist of atoms from different elements bonded in fixed ratios, forming the substance known as a compound.
Explanation:The statement 'For compounds, the basic structural unit representing the compound is the atom.' is false. The smallest particle of most compounds is called a molecule. For instance, a water molecule (H₂O) is always made up of one atom of oxygen and two atoms of hydrogen. This molecule is the basic unit that represents the compound water, not a single atom. Compounds are characterized by atoms of different elements bonded together, and these atoms are in fixed, whole-number ratios.
Isomers are molecules that have the same number and type of atoms but arranged differently. For example, molecules with the formulas CH₃CH₂COOH and C₃H₆O₂ could indeed be structural isomers since they have the same molecular formula but could have a different arrangement of the atoms within the molecule.
Atomic Elements
Most elements exist as individual atoms as their basic unit. When combined in specific ways, these atoms form molecules, which are the basic units of compounds. A single atom by itself cannot represent a compound; it is the molecule, composed of two or more atoms, that does so.
What is the concentration of hydrogen ions commonly expressed as
Answer: pH scale
Explanation:
A change in the amount of heat energy lost or gained by a system during a process is_________________________
Answer:
chemical change
An expandable container of oxygen gas has a volume of 125 mL and a temperature of 25.0?C. What volume will the gas occupy at 55°C?
Answer:
137.6 mL.
Explanation:
We can use the general law of ideal gas: PV = nRT.where, P is the pressure of the gas in atm.
V is the volume of the gas in L.
n is the no. of moles of the gas in mol.
R is the general gas constant,
T is the temperature of the gas in K.
If n and P are constant, and have different values of V and T:(V₁T₂) = (V₂T₁)
Knowing that:
V₁ = 125.0 mL, T₁ = 25°C + 273 = 298 K,
V₂ = ??? mL, T₂ = 55°C + 273 = 328 K,
Applying in the above equation(V₁T₂) = (V₂T₁)
∴ V₂ = (V₁T₂)/(T₁) = (125.0 mL)(328 K)/(298 K) = 137.6 mL.
Final answer:
To find the volume of the gas at a different temperature, we can use Charles's Law. By using the formula V1/T1 = V2/T2 and substituting the known values, we can determine that the volume of the gas at 55°C is 275 mL.
Explanation:
To solve this problem, we can use Charles's Law, which states that the volume of a gas is directly proportional to its temperature, assuming the pressure remains constant. We can use the formula:
V1/T1 = V2/T2
Given that the initial volume (V1) is 125 mL and the initial temperature (T1) is 25.0°C, we can substitute these values into the formula. Rearranging the formula to solve for V2, we get:
V2 = (V1*T2)/T1
Substituting the known values, we have:
V2 = (125 mL * 55 °C) / 25.0 °C = 275 mL
Therefore, the volume of the gas at 55°C is 275 mL.
The radioactive element carbon-14 has a half-life of 5750 years. a scientist determined that the bones from a mastodon had lost 72.6% of their carbon-14. how old were the bones at the time they were discovered?
The tendency of an element to react with other elements to produce compounds is called
Answer:
Organic compound is the correct answer
Explanation:
The specific heat for liquid argon and gaseous argon is 25.0 J/mol·°C and 20.8 J/mol·°C, respectively. The enthalpy of vaporization of argon is 6506 J/mol. How much energy is required to convert 1 mole of liquid Ar from 5°C below its boiling point to 1 mole of gaseous Ar at 5°C above its boiling point?6631 J229 J6735 J125 J6610 J
Answer:
6,735 JExplanation:
The total energy required to convert 1 mole of liquid from 5°C below its boiling point to 1 mole of gaseous Ar at 5° above its boiling point may be calcualted in three stages:
Heating the liquid Ar from 5°C below its boling point to the boiling pointVaporizing the liquid Ar at its boiling temperatureHeating the gaseous Ar from its boiling point to 5°C above it.1) Energy to heat the liquid Ar from 5°C below its boling point to the boiling point:
Q₁ = m × C × ΔT = 1 mol × 25.0 J/mol°C × 5°C = 125 J2) Energy to vaporize the liquid Ar:
Q₂ = m × Latent heat of vaporization = 1 mol × 6506 J/mol = 6506 J3) Energy to heat the gaseous Ar 5°C above its boiling point:
Q₃ = m × C × ΔT = 1 mol × 20.8 J/mol°C × 5°C = 104 J4) Total energy (E)
E = Q₁ + Q₂ + Q₃ = 125 J + 6506 J + 104 J = 6735 J ← answerThe total energy required to convert 1 mole of liquid Argon from 5°C below its boiling point to 1 mole of gaseous Ar at 5°C above its boiling point is calculated through a multi-step process. The steps involve increasing the temperature of the liquid to its boiling point, vaporizing at the boiling point, and further heating the gas above the boiling point. The sum of these three steps yields a total required energy of 6735 J.
Explanation:This is a multi-step thermodynamics problem in chemistry that requires the use of specific heat, change in temperature, and enthalpy of vaporization. The energy required to convert 1 mole of liquid Argon from 5°C below its boiling point to 1 mole of gaseous Ar at 5°C above its boiling point can be found through the equation: q = m*c*ΔT, where q is the heat energy, m is the amount of Argon in moles, c is the specific heat, and ΔT is the change in temperature.
First, we need to raise the temperature of the liquid argon from 5°C below the boiling point to the boiling point. Using the specific heat for liquid argon, this gives us q1 = (1 mol)(25.0 J/mol·°C)(5°C) = 125 J.
Next, we have to provide the heat of vaporization to convert the liquid to gas at the boiling point, which gives us q2 = 6506 J/mol. Then we have to further heat the gas from the boiling point to 5°C above it. Using the specific heat for gaseous argon, this gives us q3 = (1 mol)(20.8 J/mol·°C)(5°C) = 104 J.
Adding these three energy amounts together, we find that total energy required is q_tot = q1 + q2 + q3 = 125 J + 6506 J + 104 J = 6735 J.
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NEED HELP!!!
Which of the following is true about the concept of half-life?
a. Half-life measures the rate of decay of a radioisotope.
b. The shorter the half-life, the more dangerous the radioisotope.
c. Half-life predicts which atoms in a radioactive sample will decay.
Answer:
b. The shorter the half-life, the more dangerous the radioisotope.
The shorter the half-life, the more dangerous the radioisotope. Therefore, the correct option is option B.
What is half-life?The half-life is the length of time required for a single quantity (of substance) to drop to half its initial value (symbol t12). The phrase is widely used in nuclear physics to describe how quickly unstable atoms dissolve radioactively or how long stable atoms endure.
The term is often used more generally to indicate any type involving exponentially decaying. In the medical sciences, for example, the biological ½ of drugs and other chemicals in the human body is a word. Half-opposite life's in exponential growth is time's doubling. The shorter the half-life, the more dangerous the radioisotope.
Therefore, the correct option is option B
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Cup A and cup B are identical. They contain equal volumes of soup at equal temperatures. Both cups are put in a refrigerator. Cup A has a lid, but cup B does not. Which statement best explains why cup A will cool more slowly than cup B?
A.
Water vapor won’t be able to escape from cup A.
B.
The most energetic water molecules from cup A will escape more rapidly.
C.
No molecules will be able to evaporate at the surface of cup B.
D.
No molecules will be able to evaporate at the surface of cup A.
Answer:
A
Explanation:
Answer: Option (D) is the correct answer.
Explanation:
It is known that in a closed system there will no exchange of heat or matter from the system to the surrounding. Whereas in an open system there will be exchange of both heat and energy from the system to the surrounding and vice versa.
Therefore, in the given situation cup A is a closed system and cup B is an open system. Hence, there will be no exchange of heat or matter from cup A to system and surrounding. So, it will cool slowly that cup B.
Thus, we can conclude that the statement no molecules will be able to evaporate at the surface of cup A, best explains why cup A will cool more slowly than cup B.
Identify whether each process is either oxidation or reduction:
Al → Al3+ + 3 e-
S2- → S + 2 e-
Cu → Cu2+ + 2 e-
Show ALL work.
Answer:
Al → Al³⁺ + 3 e⁻, is an oxidation process.
S²⁻ → S + 2 e⁻, is an oxidation process.
Cu → Cu²⁺ + 2 e⁻, is an oxidation process.
Explanation:
The oxidation-reduction reaction contains a reductant and an oxidant (oxidizing agent).The oxidation process is the process in which electrons are lost and produce positively charged ions.The reduction process is the process in which electrons is gained and negatively charge ions are produced.So,
Al → Al³⁺ + 3 e⁻, is an oxidation process.Al loses 3 electrons and produce Al³⁺c
S²⁻ → S + 2 e⁻, is an oxidation process.S²⁻ loses 2 electrons and produce S.
Cu → Cu²⁺ + 2 e⁻, is an oxidation process.Cu loses 2 electrons and produce Cu²⁺.
All the given processes (Al becoming Al₃+, S₂- becoming S, and Cu becoming Cu₂+) are examples of oxidation, as each involves the loss of electrons.
Explanation:To determine whether each process is oxidation or reduction, we will look at the change in electron configuration for each reaction.
Al → Al₃+ + 3 e-: Here, Aluminum (Al) is losing three electrons to form Al₃+. This is an oxidation process because oxidation is characterized by the loss of electrons.S₂- → S + 2 e-: In this process, the sulfide ion (S₂-) is losing two electrons to become elemental sulfur (S). This is also an oxidation process, as it involves the loss of electrons.Cu → Cu₂+ + 2 e-: Copper (Cu) loses two electrons to form Cu₂+. Similar to the previous examples, this is an oxidation process because it involves the electron loss.Thus, all the given processes are examples of oxidation, where each element or ion loses electrons.
In what way does hemoglobin act as a buffer against changes in blood ph?
Answer:
Explanation:
Hemoglobin removes excess protons from the red blood cells so that they can be excreted through the kidneys.
Hemoglobin binds some of the excess protons released by carbonic acid.
Subsequent binding of oxygen is drastically reduced after the first one is bound.
Hemoglobin produces protons or hydroxide ions as needed to alter the blood pH.
Answer:
Excess acids in the red blood cells are removed by the hemoglobin
Explanation:
In what way does hemoglobin act as a buffer against changes in blood ph?
Excess acids in the red blood cells are removed by the hemoglobin . it is a good receptor of excess proton released by carbonic acid.
It helps to remove acids before it affects the PH of the blood. deoxygenated hemoglobin are better receptor of proton than the oxygenated one.
If hemoglobin does not act as a buffer, there will be changes in the blood's PH and can poison the blood.
An electrolytic cell is based upon a nonspontaneous reaction; the Eocell for the reaction is _____.
greater than one
less than zero
equal to one
equal to zero
In an electrochemical cell in which the oxidation reaction is nonspontaneous the oxidation will not occur spontaneously at the anode and the reduction will not be spontaneous at the cathode. And according to the law for the calculation of the voltage potential of the electrochemical cell (Ecell):
Ecell = Eox. - Ere. where (Eox. is the potential of the oxidation at the anode and Ere. is the potential of the reduction at the cathode). The standard potential for an electrolytic cell is negative, because of the Ere. which is greater than Eox.
The answer is : less than zero.