Answer:
to figure out how to sustain large populations in this environment.
brainliest plssAnswer:
The maya needed to create innovative ways to manage water because they lived in a dry climate.
They needed to find ways to collect water and store it for later use.
Explanation:
There were downpours during the unpredictable wet season and there was a long dry season
Not many rivers
draw the main organic products of the reaction. indicate the stereochemistry, including all hydrogen atoms, at each stereocenter. omit byproducts such as salts or methanol. the starting material is a 6 carbon ring where carbon 1 has a wedged bond to bromide and a dashed bond to hydrogen. moving counterclockwise, carbon 2 has a wedged bond to methyl and a dashed bond to hydrogen. this reacts with c h 3 o n a and methanol to form the product.
Well here i can't provide the diagram of the starting material is a 6 C ring where C 1 has a wedged bond to bromide (Br) and a dashed bond to hydrogen. moving counterclockwise, C 2 has a wedged bond to methyl and a dashed bond to hydrogen. this reacts with c h 3 o n a and methanol to form the product.
Describe the following :What is Bromide?Bromide is the negatively charged member of the halogen group and is a form of Bromine element. Bromine's atomic no is 35 and atomic mass is 79.904 u.
Methanol:Methanol is first of all is a organic chemical with the formula CH₃OH. It is an aliphatic alcohol which is colorless and volatile in nature.
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Directed Reading for Key Terms
Content Mastery
Chemical Reactions
Directions: Unscramble the terms in italics to complete the sentences below. Write the terms on the lines provided.
1. A sonoditecimpo reaction is one in which a substance
breaks down into two or more substances.
(TIL
2. A chemical noqituae describes a chemical reaction using
chemical formulas and other symbols.
3. In an ingrocexe reaction, the amount of energy needed to
break the original bonds is less than the energy released
when new bonds form.
4. In a glinse-spladicetnem reaction, one element replaces
another in a compound.
5. A lamcechi reaction is a change in which one or more
substances are converted into new substances.
6. A snteshisy reaction is one in which two or more
substances combine to form another substance.
7. In an icehomextr reaction, the energy given off is primarily
in the form of heat.
8. The kind of reaction energy that requires energy in the
form of heat is called remdothcine.
9. An orhibint ties up a reactant and prevents it from
undergoing the original reaction.
10. The insoluble compound that forms during a double-
displacement reaction is called a treaticipep.
11. When more energy is required to break bonds than to
form new ones, the reaction in called gonderince.
Javisina
12. The numbers that represent the number of units of each
substance taking part in a reaction are called isceffoticen.
cin
13. A chemical reaction that has the same number of elements
labor neaille on both sides of the equation is deblanac.
Copyright © Glencoe/McGraw-Hill, a division of The McGraw-Hill Companies, Inc.
Each of the unscrambled terminologies in italics should be used to complete the sentences as follows;
A decomposition reaction is one in which a substance breaks down into two or more substances.A chemical equation describes a chemical reaction using chemical formulas and other symbols.In an exergonic reaction, the amount of energy needed to break the original bonds is less than the energy released when new bonds form.In a single-displacement reaction, one element replaces another in a compound.A chemical reaction is a change in which one or more substances are converted into new substances.A synthesis reaction is one in which two or more substances combine to form another substance.In an exothermic reaction, the energy given off is primarily in the form of heat.The kind of reaction energy that requires energy in the form of heat is called endothermic.An inhibitor ties up a reactant and prevents it from undergoing the original reaction.The insoluble compound that forms during a double-displacement reaction is called a precipitate.When more energy is required to break bonds than to form new ones, the reaction in called endergonic.The numbers that represent the number of units of each substance taking part in a reaction are called coefficients.A chemical reaction that has the same number of elements on both sides of the equation is balanced.What is a chemical reaction?In Science, a chemical reaction can be defined as a chemical process that involves the continuous transformation and rearrangement of the ionic, atomic or molecular structure of a chemical element by breaking down and forming chemical bonds, in order to produce a new chemical compound while new bonds are formed.
What are the types of chemical reactions?Based on changes in chemical structure, there are five (5) main types of chemical reaction and these include the following;
Double-displacement chemical reaction.Decomposition chemical reaction.Combination chemical reaction.Combustion chemical reaction.Single-displacement chemical reaction.Read more on Single-displacement reaction here: https://brainly.com/question/3172917
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which of the following statements is incorrect about a concentration cell consisting of the same metal and metal ion solutions at different concentrations? a) reduction occurs in the more concentrated solution. b) the cell containing the more concentrated solution is the anode. c) the standard electrode potential (e°) of the electrochemical cell is zero d) the greater the difference in concentrations of the half-cells, the greater the initial voltage is. e) a spontaneous redox reaction occurs until the concentrations become equal.
The statements that is incorrect about a concentration cell consisting of the same metal and metal ion solutions at different concentrations is the cell containing the more concentrated solution is the anode.
So option B is correct.
What are metal ion solutions?A metal ion solution or aqua ion is described as a cation, dissolved in water, of chemical formula [Mₙ]ᶻ⁺. The solvation number, n, determined by a variety of experimental methods is 4 for Li⁺ and Be²⁺ and 6 for most elements in periods 3 and 4 of the periodic table.
A concentration cell is also described as a limited form of a galvanic cell that has two equivalent half-cells of the same composition differing only in concentrations. A spontaneous redox reaction occurs in a concentration cell until the concentrations of the solutions become equal.
The cell containing the more concentrated solution is the cathode while the cell containing the less concentrated solution is the anode.
Also, the standard electrode potential (e°) of the electrochemical cell is zero.
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a 500-gram mass of iron at 40 degree c is placed into an insulated bucket of 500 grams of water at 20 degree c. estimate the final temperature.
The final temperature is less than 30 degrees.
Mass, in physics, quantitative measure of inertia, an essential property of all dependents. It's far, in effect, the resistance that a frame of count number gives to a change in its speed or position upon the application of pressure. The more the mass of a frame, the smaller the alternate produced with the aid of a carried-out force.
The unit of mass within the worldwide machine of gadgets (SI) is the kilogram, which is defined in terms of Planck's regular, which is described as equal to 6.62607015 × 10−34 joule 2d squared.
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a 45-g aluminum spoon (specific heat 0.88 j/g °c) at 24 °c is placed in 180 ml (180 g) of water at 85 °c and the temperature of the two become equal. specific heat of water is 4.184 j/g°c. what is the final temperature when the two become equal.
T= 81.960C is the final temperature when the two become equal.a 45-g aluminum spoon (specific heat 0.88 j/g °c) at 24 °c is placed in 180 ml (180 g) of water at 85 °c and the temperature of the two become equal. specific heat of water is 4.184 j/g°c.
Natural environments do not contain pure aluminium. Beginning with bauxite ore, which is made up of hydrated aluminum oxide (40% to 60%) combined with silica and iron oxide, the manufacturing of primary aluminum metal can begin. For every 4 to 5 tonnes of bauxite ore, 2 tonnes of alumina are produced. Aluminum corrodes even if it doesn't rust. The metal is kept largely protected from corrosion by the aluminum oxide coating's high resistance and ability to repair itself after injury. It is well known for being both lightweight and flexible, making aluminum a very versatile metal with many benefits. built to accommodate a wide range of uses.We Know that Q= heat = mCp\DeltaT
where m= mass, Cp = heat capacity, \DeltaT = temperature difference The heat lost by hot fluid = heat gained by cold fluid
mhCph\DeltaT = mcCpc\DeltaT
where h and c denote hot(coffee)and cold(aluminium spoon) respectively. Heat capacity of water = 4.2 J(mole*K)= heat capacity of coffee(given), On substituting all the given terms:
180*4.2*(85-T) = 45*0.88*(T-24)
On Solving, T= 81.960C
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how many moles of magnesium oxide are produced by the reaction of 3.82 g of magnesium nitride with of water? mg3n2 3h2o → 2nh3 3mgo question 22 options: 0.114 0.0756 0.429 4.57 0.0378
The reaction will produce 6.61 mole of magnesium oxide.
What is the purpose of magnesium oxide?
There are several uses for magnesium oxide. Some people use it as an antacid to treat acid indigestion, digestive problems, and heartburn. Magnesium oxide can also be used as a laxative to quickly and temporarily empty the bowels (before surgery, for example).
Briefing:
This clearly demonstrates that 100.95g magnesium nitride reacts with 108.06g of water to give stoichiometric ammonia and magnesium oxide.
moles of Mg3N2 = 3.82g /100.95g per mole =0.0387 mole
mole of OH2 = 7.73g/18.01g per mole
magnesium oxide, i.e. 0.0387 mole × 58.32g per mole= 6.61mole
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How many molecules are in 24.0 g of
H₂SO4?
Explanation:
RFM=98g
1mol=6.022x10^23molecules
1mol=RFM
98g H2SO4=6.022x10^23molecules
24.0g H2SO4=?
24×6.022×10^23/98
=1.475×10^23 molecules
Technician a says that gasoline engines have spark plugs to ignite the air-fuel mixture. Technician b says that diesel engines use compression to ignite the air-fuel mixture. Who is correct?.
Answer:
Both technician a and b are correct that gasoline engines have spark plugs to ignite the air-fuel mixture. Technician b says that diesel engines use compression to ignite the air-fuel mixture.
Explanation:
Gasoline engines- Any of a group of internal combustion engines known as gasoline engines produce power by igniting a volatile liquid fuel (such as gasoline or a gasoline combination like ethanol) with an electric spark.
Diesel engines-The Rudolf Diesel-inspired diesel engine is a type of internal combustion engine known as a compression-ignition engine because it ignites fuel by heating the air in the cylinder as a result of mechanical compression (CI engine). This contrasts with engines that ignite the air-fuel mixture using spark plugs, such as gasoline or gas engines (using a gaseous fuel like natural gas or liquefied petroleum gas).
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what is the maximum number of electrons in an atom that can have these quantum numbers? n = 3, l = 2, ms = - 1/2
The most electrons that can have the quantum numbers n = 3, l = 2, and ms = -1/2 in an atom is 10.
Each electron in an atom is quantized using four quantum numbers:
The energy of the electron shell, which corresponds to the separation from the nucleus, is described by the principal quantum number (n). N must be an integer with a positive value.
The electron's orbital form is described by the angular momentum quantum number (l). L has an integer value that ranges from 0 to n-1.
The orbital's orientation with respect to the three axes of space is described by the magnetic quantum number (ml). An integer with the values -l to +l makes up the value for ml.
There are only two potential values for the spin quantum number (ms), which describes the electron's spin: +1/2 or -1/2.
The maximum number of electrons that can have the main quantum number of 3 and an angular momentum quantum number of 2 is what we are interested in learning in this inquiry. Since there are only two conceivable values for the spin quantum number, we know that a maximum of two electrons with opposite spins can occupy an orbital. The greatest number of electrons that can have the quantum numbers n=3 and l=2 can be calculated by counting the number of orbitals that can have a value of l=2 and multiplying that number by two.
The possible values for ml are -2, -1, 0, 1, and 2, since l=2 and we know from the information above that ml is an integer that ranges from -l to +l. This demonstrates that the total number of orbitals with the angular momentum quantum number l=2 is five. We obtain 52=10 by putting two electrons into each of these orbitals.
An electron with the quantum numbers n = 3 and l = 2 can have a maximum of 10 electrons.
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hydrocarbon gas is 81.7% c and the rest hydrogen by mass. at a temperature of 25°c and a pressure of 1atm, 1.28 g of this gas occupies 0.714 l. what is the molecular formula?
So the formula is C2H4, hydrocarbon gas is 81.7% c and the rest hydrogen by mass. at a temperature of 25°c and a pressure of 1atm, 1.28 g of this gas occupies 0.714 l.
Purely made of carbon and hydrogen, hydrocarbons are by far the most prevalent substance in crude oil, refined petroleum hydrocarbons (such as gasoline, diesel, kerosene, fuel oil, and lubricating oil), coal tar, creosote, dyestuff, and pyrolysis waste products. The most fundamental class of organic molecules are referred to as hydrocarbons. They only contain the two elements hydrogen and carbon, as implied by their name. In a branching or chain-like arrangement, hydrogen atoms surround one or more central carbon atoms in hydrocarbon molecule.
Carbon : Hydrogen mole ratio = 12
85.7 :14.3= 7 : 14 = 1 : 2
Empirical formula = C H : empirical formula wt = 14
Given 1 litre at NTP weighs 1.26 g
Therefore 22.4 litres will weigh = 28 g
n = 14, so the formula is C2H4
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If molecules of hydrogen, nitrogen, oxygen and chlorine have the same kinetic energy which molecule will be moving the fastest?.
Among hydrogen, nitrogen, oxygen and chlorine gas particles, hydrogen has the smallest particles will move with the fastest speed.
The formula of kinetic energy is :
KE= 1/2 (Mv^2)
Where, KE = kinetic energy
m = mass of the gas particle
v = velocity of the gas
Different gas particles move at different speeds with this kinetic energy—gases with smaller particles tend to be moving faster at the same temperature, which means they have a higher speed.
Among hydrogen, nitrogen, oxygen and chlorine gas particles, Chas the smallest particles will move with the fastest speed.
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What energy is associated with a photon in the infrared region of the spectrum having a frequency of 2.9 × 1013 5-1?
Answer:
1.9 x 10^-20 Joules
Explanation:
I'll assume the frequency is 2.9 x 10^13 Hz [5-1 was meant to be s^-1].
The energy of a photon is given by the releationship:
E = hf, where E is energy, h is Planck's constant, and f is frequency, in 1/s or Hz.
Planck's constant = 6.62607E-34 J*s
E = hf
E = (6.626 x 10^-34 J*s)*(2.9 x 10^13 s^-1)
E = 1.9 x 10^-20 Joules
also known asa toxic heavy metal , the lead in some paints is an example ofhazardous waste. why?
Except for combustible, oil-based paint, which contains lead, mercury, arsenic, et cadmium, it's likely your you color is just a garbage that needs special handling.
What is a metal, exactly?Metal is any of a group of substances with strong thermal and electrical conductivity, mutability, flexibility, and high light reflection.
How useful is metal?Metals are excellent building materials. Strength, hardness, and stiffness are just a few of the qualities metal metals possess. Metals may be heated and formed into anything, from a little paperclip to an enormous airplane. They are important for wires or cooking pans as they are efficient heat and electricity conductors.
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What is the concentration in % (m/v) of a nacl solution prepared by dissolving 9. 3 g of nacl in sufficient water to give 350 ml of solution?.
350 ml of NaCl solution made by combining 9. 3 g of NaCl with enough water to dissolve it has a 0.458M molarity.
The solution is represented by molarity. M stands for "molarity," which is the amount of solute in moles per liter of solution.
The formula for calculating molarity is
M = moles of solute/liter of solution.
The mass of NaCl is 9.3 g, the volume of the solution is 350 mL, and the volume of the solution in liters is given by 350/1000, or 0.35 L.
M = moles of NaCl/liter of solution is the formula used to calculate M.... (1)
Therefore, we must first determine the moles of NaCl.
Molar mass (NaCl)/mass of NaCl = moles of NaCl...... (2)
NaCl's molar mass is 58 g/mol.
Add values to Eq (2)NaCl moles are 9.3 g/58 g/mol.NaCl moles equal 0.16 mol. Place the numbers in Eq. (1) as follows:
M = 0.16 mol/0.35 L
M = 0.458
The Molarity then equals 0.458M.
The molarity is 0.458M as a result.
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if 6.506.50 l of water vapor at 50.2 °c50.2 °c and 0.1210.121 atm reacts with excess iron, how many grams of iron(iii) oxide will be produced? 2fe(s) 3h2o(g)⟶fe2o3(s) 3h2(g)
1.57g of iron(iii) oxide will be produced.
What do you mean by ideal gas equation?
The Ideal gas law is the equation of state of a hypothetical ideal gas. It is a good approximation to the behaviour of many gases under many conditions, although it has several limitations. The ideal gas equation can be written as
PV = nRT
Where,
P is the pressure of the ideal gas.
V is the volume of the ideal gas.
n is the amount of ideal gas measured in terms of moles.
R is the universal gas constant.
T is the temperature.
V = 6.50 L
T = 50.2 degree celsius = 50.2 + 273.15 K = 323.35 K
P = 0.121 atm
Using ideal gas equation,
n = PV/ RT = 0.121 atm* 6.50 L / 0.0821 * 323.35 K = 0.0296 mol
0.0296 mol of H20* 1mol Fe2O3 / 3mol H2O * 159.69g of Fe2O3/1 mol Fe2O3= 1.57g
So, 1.57g of iron(iii) oxide will be produced.
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Compound B has molecular formula C6H10 and gives (CH3)2 CUCH2CH2CH3 when treated with excess H2 in the presence of Pd. B reacts with NaNH2 and CH3I to form compound C (molecular formula C7H2).
The compound B is 3,3-dimethyl-1-butyne, and the compound C is 4,4-dimethyl-2-pentyne.
Alkynes are hydrocarbons that have triple bonds between carbon atoms. CₙH₍₂ₙ₋₂₎ is the typical formula for molecules with one triple bond. Alkynes undergo many of the same reactions as alkenes, but because a triple bond contains two p-bonds, they can react twice.
Here, compound B with the molecular formula C₆H₁₀ is 3,3-dimethyl-1-butyne and compound C is 4,4-dimethyl-2-pentyne. The compound B reacts with sodium amide (NaNH₂) and methyl iodide (CH₃I), giving the compound C. This reaction explains the acidity of non-terminal alkynes.
In this reaction, sodium amide first abstracts the protons from carbon atoms near the triple bond. The resulting carbanions undergo rapid proton transfer equilibria to form a stable terminal alkyne conjugate base.
The reaction is attached.
The complete question is -
Identify the compounds B and C. Compound B has molecular formula C₆H₁₀ and gives (CH₃)₂CHCH₂CH₂CH₃ when treated with excess H₂ in the presence of Pd. B reacts with NaNH₂ and CH₃I to form compound C (molecular formula C₇H₁₂).
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magnesium carbonate, mgco3, is insoluble. identify the spectator ions when aqueous solutions of sodium carbonate and magnesium chloride are combined.
When sodium carbonate and magnesium chloride are mixed in aqueous solutions, the spectator ions are No3- and Na+.
What spectator ions result when mixing sodium carbonate and magnesium chloride in aqueous solutions?Salt and chloride are the spectator ions. The only insoluble component in this reaction is magnesium carbonate. Both water and a gas compound are not created. This indicates that all other ions are spectator ions and remain in aqueous solutions on both sides of the reaction equation.
What happens when sodium carbonate and magnesium chloride are combined?Magnesium carbonate and sodium chloride are created when sodium carbonate, Na 2CO 3, and magnesium chloride, MgCl 2, react.
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a balloon is filled to a volume of 1.75 l with 3.50 moles of gas at 25 °c. with pressure and temperature held constant, what will be the volume of the balloon if 0.25 moles of gas are released?
The volume of the balloon if 0.25 moles of gas are released is 1.3L.
Solution:
[tex]\frac{1.75L}{3.50mol} = \frac{V_{2} }{2.6 moles}[/tex]
V₂ = 1.75 L * 2.6 moles/3.50 moles
= 1.3L
If the temperature and pressure are kept constant, the volume of the gas is directly proportional to the number of gas molecules. At constant temperature and volume, the pressure of a gas is directly proportional to the number of gas molecules present. As the balloon heats up, it expands and the air inside the balloon becomes less dense.
The volume and temperature kept changing so that the pressure remained constant. If the temperature is kept constant, the volume of a given amount of gas is inversely proportional to its pressure. Under the same conditions of temperature and pressure, the same volume of all gases contains the same number of molecules.
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at 50.14 k a substance has a vapor pressure of 258.9 torr. calculate its heat of vaporization in kj/mol it if has a vapor pressure of 161.2 torr at 277.5 k
At 50.14 k a substance has a vapor pressure of 258.9 torr. its heat of vaporization in kJ/mol it if has a vapor pressure of 161.2 torr at 277.5 k is
given that :
temperature T1 = 50.14 K
pressure P1 = 258.9 torr
temperature T2 = 277.5 K
pressure P2 = 161.2 torr
using the Clausius Clapeyron , we get :
ln ( P1 / P2 ) = - ΔH / R (1/ T1 - 1/T2)
ln ( 258.9 / 161.2 ) = - ΔH / 8.314 ( 1/ 50.14 - 1 / 277.5 )
ΔH = 41.83 kJ/ mol
The heat of vaporization ΔH = 41.83 kJ/ mol.
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what mass of fe2o3 is produced when 27.2 l of o2 gas react with fes at 452 k and 3.86 atm. 4fes(s) 7o2(g)⟶2fe2o3(s) 4so2(g) first, use the ideal gas equation to calculate the moles of o2. ????
Using the ideal gas equation, the number of mole of O₂ is 2.83 mol.
What is the ideal gas equation?PV = nRT is the formula for the ideal gas equation. In this equation, P denotes the ideal gas's pressure, V the volume of the ideal gas, n the total amount of ideal gas measured in moles, R the universal gas constant, and T the temperature.
The reaction becomes:
4 FeS (s) + 7O₂ (g) → 2Fe₂O₃ (s) + 4SO₂ (g) .
Volume of O₂ = 27.2 L .
Pressure = 3.86 atm.
Temperature = 452 K .
We have to calculate what mass of Fe₂O₃ will be produced from the given starting material.
We know that,
According to Ideal gas law,
PV = nRT
Where ,
P is pressure
V is volume
n is number of mole.
R is gas constant.
T is temperature.
Now putting the values,
3.86 atm x 27.2 L = n x (0.0821 L.atm/ mol.K) x 452 K
n = 2.83 mol.
So the number of mole of O₂ is 2.83 mol.
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The solution for bounded buffer problem provided in section 7. 1. 1 does not work correctly if there are more than one producer or consumer.
a. True
b. False
The following assertion is true , If there are several suppliers or customers, the solution for the bounded buffer problems mentioned in section 7. 1. 1 will not function properly.
What is solution explain?A mixture is any mixture in which one or more solutes have been broken down by a solvent. Solutes must dissolve in solvents to form homogeneous mixtures. Solutes must dissolve in solvents to form homogeneous mixtures.
What are 4 examples of a solution?Types such solution include sugar-water, salt solutions, metal, alloy, alcohol in water, aerosols, air, and aerated beverages like Coca-Cola. When working with chemicals, we frequently make a variety of solutions, such copper in water and iodine in alcohol, among others.
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yet, despite the similarity in their appeareance, these two substances differ greatly in their porperties, since one is a molecular solid and the other is an ionic solid. how do the properties differ and why?
Molecular solid have covalently bonded atoms in it whereas Ionic solid have electronic bonds between its atoms..
We employ the octet rule, which states that all atoms in a compound are expected to comply by, to confirm the accuracy of any chemical structure. Every atom in the carbon IV oxide model precisely complies with the octet rule. The valence shell of each atom in the molecule is surrounded by eight electrons. We can therefore conclude that this structure is accurate given the total number of bonds and electrons, as well as the fact that CO₂ has sixteen valence electrons.
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the half life of a radioactive substance is 1459 years. what is the annual decay rate? express the percent to 4 significant digits.
The relation between half-life and rate at which it is decaying is given by
t(1/2) = log2/rate
now in the above problem half-life is given as 1459 years substituting in the above equation we get the value of rate at which it is decaying to be rate=0.0001075.
The amount of substance that is present after t years given that the half-life of the substance is h is calculated through the equation,
A(t) = A(o)(0.5^t/h)
The 1/2-life of a radioactive isotope is the quantity of time it takes for one-1/2 of the radioactive isotope to decay. The half of-existence of a selected radioactive isotope is consistent; it's miles unaffected by using situations and is independent of the initial quantity of that isotope.
1/2-life (symbol t1⁄2) is the time required for an amount (of substance) to reduce to half of its initial price. The time period is commonly utilized in nuclear physics to explain how speedy volatile atoms undergo radioactive decay or how long strong atoms survive.
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How does the strength of the imfs in water compare to the strength of the imfs in ethanol?.
Water has higher intermolecular force strength as compared to that of ethanol.
Water can form hydrogen bonds four ways as compared to ethanol that can form hydrogen bonds two ways. thus, water has strong bonds.
The interaction known as hydrogen bonding, which involves a hydrogen atom sandwiched between two other atoms with a high affinity for electrons, is stronger than van der Waals forces but weaker than ionic or covalent bonds. Atoms in separate molecules or distinct regions of the same molecule can form hydrogen bonds with one another. A hydrogen atom (FH, NH, or OH) is covalently bound to one of the pair's (the donor) typically fluorine, nitrogen, or oxygen atoms, with which it shares electrons unevenly. As a result of this high electron affinity, the hydrogen gains a little positive charge. The other atom in the pair, which is usually F, N, or O, has an unshared electron pair, giving it a little negative charge.
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for a cell consisting of cu(s) in 0.03 m cu(no3)2(aq) and cu(s) in 1.49 m cu(no3)2(aq), what is the value of ecell in v (assume 298k)?
For a cell made up of cu(s) in 0.03 m cu(no3)2(aq) and cu(s) in 1.49 m cu, the value of ecell in v (assuming 298k) is 2.0 V. (no3) 2(aq)
What is the process of a solar cell?
Galvanic (or voltaic) cells generate an electric current via a thermodynamically advantageous redox reaction. In a separate compartment, or half-cell, each half-reaction takes place alongside an electrode. The electrodes where oxidation and reduction happen are called the anode and cathode, respectively.
What sets voltaic cells apart from galvanic ones?
Galvanic (or voltaic) cells use a thermodynamically advantageous redox reaction to produce an electric current. Each half-reaction takes place next to an electrode in a distinct compartment, or half-cell. The anode and cathode, respectively, are the electrodes where reduction and oxidation occur.
Briefing:
For the oxidation half cell;
Al(s) -------> Al^3+(aq) + 3e.
For reduction half cell;
Cu^2+(aq) +2e ------> Cu(s).
E°cell = E°cathode - E°anode
But;
E°cathode= 0.34 V
E°anode = -1.66 V
E°cell= 0.34 -(-1.66)
E°cell= 2.0 V
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what does the detector measure, and how are these numbers used to calculate transmittance and then absorbance?
The detector is used to measure the transmittance as well as the absorbance.
Through transmittance, the total light that passes through the sample is measured. Through absorbance, the total amount of light that can be observed by an object is measured.
The numbers that are generated on the spectrophotometer by the transmitter represent the total light given and that which is absorbed. By using these numbers we can measure the transmittance. The rate of transmittance as well as absorbance for each sample will be different.
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the beta decay of cesium-137 has a half-life of 30.0 years. how many years must pass to reduce a 26 mg sample of cesium 137 to 5.7 mg?
Answer:
10 pts you say?
Explanation:
Unlike soap, which is ionic, some liquid laundry detergents are neutral molecules. Explain how each of the following molecules behaves like soap and cleans away dirt.
Molecules behave like soap and clean away dirt by:
The molecule serves as a catalyst so the dirt and water can bond directly.The molecule ionizes readily. The molecule displaces the dirt by bonding to the clothing. The molecule has a highly polar end and a nonpolar tail.What kind of molecule is a detergent?
Detergents are amphipathic molecules that contain polar or charged hydrophilic groups (heads) at the end of long lipophilic hydrocarbon groups (tails) (Figure 1). They are also known as surfactants because they decrease the surface tension of water.
Why is detergent more effective than soap?
A soap contains a COO− group, which is capable of dispersing the attractive forces between water molecules, known as "surface tension", but will not be able to do this indefinitely. Detergents on the other hand contain an O−SO3− group with the same ions which can hold this force at bay.
What are the properties of detergent?
Detergents are products containing soap or other surfactants with surfactant properties: wetting property, emulsion (foam), breaking bonds between the dirt and its holder.
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why is it necessary to determine the wavelength of maximum absorbance (aka λmax) of the copper sulfate solution before the absorbance of the five standard solutions and the unknown are measured
It is necessary to determine the wavelength of maximum absorbance (aka λmax) of the copper sulfate solution before the absorbance of the five standard solutions because this helps in getting the molar concentration of the unknown solution.
In the absorbance vs wavelength graph for a solution of copper sulfate notice that solutions absorb strongly from approximately 600 to 800 nm, with the maximum absorbance is around 750 nm. Thus in an experiment, we would choose a wavelength within that range. There is an vital distinction between the color of the light we observed reflected and the color the light absorbed. A wavelength of 750 nm indicates to red light, while a solution of copper sulfate appears to be blue. Copper sulfate solution reflects or transmits blue light, but absorbs red light.
Higher absorbance of the wavelength provides higher sensitivity observes at a wavelength of maximum absorbance (aka λmax) that helps to get the molar concentration of the unknown solution.
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the ground-state valence-shell configuration of a particular atom is 4d105s25p1. the element to which this atom belongs is a
The atomic number of indium is 49, and its electronic configuration is [Kr] 4d105s25p1. This atom is a member of the element that belongs to groups 13 and 5. The luster of indium is bright silvery-white.
What is the electron configuration of valence shell in the ground state?The least energetic and most stable configuration is the ground state configuration. A higher energy configuration is called an excited state configuration (it requires energy input to create an excited state). The electrons used in bonds are valence electrons.
Valence electrons: What are they?The electrons in an atom's outermost shell, or energy level, are called valence electrons. oxygen has 6 valence electrons two in the 2s subshell and four in the 2p subshell. The electron configuration of oxygen can be expressed as 2s22p4.
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