The same solvent as the liquid in the original mixture should be used to wash the solid material collected from a filtration.
The solid material which is collected from the filtration is washed by that solvent in which that solid material is dissolved. Generally methanol solvent is used to wash the solid material collected from a filtration.
The filtration is the process in which solid particles present in liquid or gaseous fluid are removed by using of a filter.This filter is only permits or allow only the fluid to pass though it and retain the solid particles.The solid particles left is known as filtrate.learn about filtration
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In a voltaic cell, a salt bridge is needed to allow the motion of ____________ between the terminals. In the salt bridge, _____________ move toward the anode and _________ move toward the cathode.
In a voltaic cell, a salt bridge is needed to allow the motion of ions between the terminals. In the salt bridge, anions move toward the anode and cations move toward the cathode.
What is a voltaic cell?A voltaic cell is an electrochemical device that harnesses the power of a chemical process to generate electrical energy. A voltaic cell's key components are:
Anode, an electrode where oxidation takes place. Anions move toward the anode.Cathode, an electrode where reduction takes place. Cations move toward the cathode.A salt bridge is an electrolyte chamber required to finish the circuit in a voltaic cell.Half-cells are containers that serve as a barrier between the oxidation and reduction reactions.The external circuit, which typically has a load attached to it, is used to carry electron flow between the voltaic cell's electrodes.A load is a component of a circuit that uses an electron flow to carry out a certain task.Working of a voltaic cell:When an electrode is dipped into the electrolyte at the electrode and electrolyte contact surface in a voltaic cell, the electrode's atoms tend to produce positive ions in the electrolytic solution while leaving the electrode's electrons unaffected. The electrode thus acquires a negative charge.
Additionally, the electrolytic solution's positive ions have a propensity to deposit on the electrode, giving it a positive charge. The electrodes get positively or negatively charged in relation to the electrolyte as a result of the two opposite processes. As a result, there is a potential difference between the electrode and electrolyte. The term "electrode potential" refers to this potential difference.
Now, the electrode where reduction occurs is known as the cathode and turns positive in relation to the electrolytic solution, whereas the electrode where oxidation occurs is known as the anode and has a negative potential in relation to the electrolytic solution. This caused a potential difference to form between the voltaic cell's two electrodes. Cell Potential is the name given to this potential differential.
The voltaic cell's potential is sometimes referred to as its electromotive force (EMF) when no current is being drawn from it. Electrons begin to flow from the anode (negative electrode) to the cathode when an external circuit is connected to the voltaic cell (positive electrode). As a result, in the external circuit, the normal current flows from the positive terminal to the negative terminal.
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Which amino acid and which atom has most to do with myoglobin’s ability to bind o2?.
The amino acid and which atom which has most to do with myoglobin’s ability to bind o2 is histidine and haemoglobin respectively
What is amino acid?Amino acids simply refers to those molecular substances which combine together to form proteins. However, they are the end products of protein digestion
So therefore, the amino acid and which atom which has most to do with myoglobin’s ability to bind o2 is histidine and haemoglobin respectively
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A diprotic acid is titrated with a strong base. The pH at the first half-equivalence point is 3.27. The pH at the second half-equivalence point is 8.53. What is the value of ka2
A diprotic acid is titrated with a strong base. The pH at the first half-equivalence point is 3.27. The pH at the second half-equivalence point is 8.53. The value of ka2 is 27.89.
What is pH ?pH is used to measure whether the substance is acidic, basic or neutral and the range is 0-14. If the pH is less than 7 then the solution is acidic in nature. if the pH is more than 7 then the solution is basic in solution. If the pH is equal to 7 then the solution is neutral in nature.
How to find the polyprotic value ?To find the polyprotic value
[tex]K_{a_2}[/tex] = pH of first half equivalence point × pH of second half equivalence point
[tex]K_{a_2}[/tex] = 3.27 × 8.53
= 27.89
Thus from the above conclusion we can say that A diprotic acid is titrated with a strong base. The pH at the first half-equivalence point is 3.27. The pH at the second half-equivalence point is 8.53. The value of ka2 is 27.89.
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This graph illustrates the course of a chemical reaction with and without an enzyme. While the products and reactants are the same, the presence of an enzyme changes the amount of energy required for the reaction to begi
Red curve shows the course of the reaction in the presence of an enzyme. Line a represents the activation energy for that reaction.
Hence, Option (iv) is correct answer.
What is Activation Energy ?Activation energy is the minimum energy required an input of energy to initiate the reaction.
[tex]k = Ae^{\frac{-E_a}{RT}}[/tex]
where,
k = rate constant
A = pre-exponential factor
Eₐ = activation energy
R = universal gas constant
T = absolute temperature (in K)
Activation energy = Threshold energy - Energy of colliding molecule.
Thus from the above conclusion we can say that Red curve shows the course of the reaction in the presence of an enzyme. Line a represents the activation energy for that reaction.
Hence, Option (iv) is correct answer.
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Disclaimer: The question was given incomplete on the portal. Here is the complete question.
Question: This graph illustrates the course of a chemical reaction with and without an enzyme. While the products and reactants are the same, the presence of an enzyme changes the amount of energy required for the reaction to begin.
Part A - Interpreting the graph
Which curve shows the course of the reaction in the presence of an enzyme--the black curve or the red curve? Which line represents the activation energy for that reaction--a, b, or c?
(i) a black curve; line a
(ii) black curve; line b
(iii) black curve; line c
(iv) red curve; line a
(v) red curve; line b
(vi) red curve; line c
Water is the ______ in aqueous solutions because it can dissolve polar molecules.
Answer:
solvent
Explanation:
Water dissolves the substances, which become the solutes in the solution.
How much energy does a 9 × 108 m wavelength photon have?
Answer:
2.2 x 10⁻³⁴ J
or
2.2 x 10⁻¹⁸ J
Explanation:
You can calculate the energy using the photon energy equation:
E = hc / λ
In this equation,
-----> E = energy (J)
-----> h = Planck's Constant (6.626 x 10⁻³⁴ J*s)
-----> c = speed of light (3.0 x 10⁸ m/s)
-----> λ = wavelength (m)
You can plug the given wavelength, along with the other constants, into the equation and simplify to find the energy.
E = hc / λ
E = (6.626 x 10⁻³⁴ J*s)(3.0 x 10⁸ m/s) / (9 x 10⁸ m)
E = 2.2 x 10⁻³⁴ J
I suspect that you may have forgotten the negative sign in front of the 8 (9 x 10⁻⁸). This would change your answer to 2.2 x 10⁻¹⁸ J.
a major textile dye manufacutrer developed a new yellow dye. the dye has a percent composition of 75.95%C, 17.72%n and 6.33%H by mass with a molar mass of about 240g/mol. determine the molecular formula of the dye
The molecular formula of dye:
A major textile dye manufacturer developed a new yellow dye with a molecular formula [tex]C_{15}N_{3}H_{15}[/tex].
Given:
Percentage composition:
C = 75.95%
N = 17.72%
H = 6.33%
Molar mass = 240 g
To find: molecular formula of dye
Calculation:
Let's assume the mass of the compound is 100 gm.
So, Mass of C = 75.95 gm
Mass of N = 17.72 gm
Mass of H = 6.33 gm
The number of moles = given mass/mass
Therefore, the number of moles of C = 75.95/12 = 6.33
The number of moles of N = 17.72/14 = 1.27
Number of moles of H =6.33/1 = 6.33
Simplest ratio:
C = 6.33/1.27 = 4.98 =5
N = 1.27/1.27 = 1
H = 6.33/1.27 = 4.98 =5
Therefore, the empirical formula is [tex]C_{5}NH_{5}[/tex]
The mass of empirical formula = 12 x 5 + 14 + 1 x 5 = 79 gm
Number of moles= molar mass/ empirical formula
n = 240/79 = 3.04 =3
Therefore, molecular formula = empirical formula x n
Hence, molecular formula = [tex]C_{15}N_{3}H_{15}[/tex]
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Juan measured the temperature of salt water. he then added 273 temperature units to the measured temperature value. which temperature conversion is juan most likely doing?
Celcius to Kelvin
Temperature is defined as the degree or intensity of heat present in a substance It is measured using a thermometer and other equipment. The temperature can be measured in Kelvin, Celsius, and Fahrenheit.
What is Temperature ?Temperature is a physical quantity, thermometers. The units in which can be measured by Celcius, and Fahrenheit. Temperature is measured can be Kelvin,
These units are interconvertible and have certain conversion factors.For example, the conversion factor for Celcius to Kelvin is:0° Celcius = 273 Kelvin
In the given situation, Juan is using the conversion factor of Celcius to Kelvin.Celsius to Kelvin temperature conversion juan most likely to do
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a. How many Joules of energy are required to raise 3.50kg of water from 38.5 to 75.0C ? (specific heat of water is 4.184J/g C)(1000g=1kg)
b. How many grams of carbon are present if it requires 37.5 kJoules of energy to heat a sample from 30.0 to 55.0C ? (specific heat of carbon is 0.71 J/g C)
c. If 480.0 Joules is applies to a 50.0g sample of Hg in a thermometer that reads 25.0C, what will be the final temperature of the sample? (SH mercury is 0.14)
d. A 25.0kg sample of an unknown metal X requires 875kJ of energy to heat it from 55.0 to 125.0C. What is the specific heat of the unknown metal?
5.690x103 miles to meters.
900.0kg to grams
Please also give sig figs to all answers.
Answer fast please.
a.
A substance's specific heat tells you how much heat is required to increase the temperature of 1 g of that substance by 1°C.
The equation that establishes a relationshop between heat and change in temperature is
q = m • c • ∆T, where
q - heat absorbed
c - the specific heat of the substance, in your case of water
ΔT - the change in temperature, defined as the difference between the final temperature and the initial temperature
so:
q = 1.00 g • 4.18 J/g×°C • (75.0 - 38.5)°C
q = 152,57 J
just apply this formula for all exercises
A. How many Joules of energy are required to raise 3.50kg of water from 38.5 to 75.0C ? (specific heat of water is 4.184J/g C)(1000g=1kg)
Answer:
q = 534,506 Joules
q = 534.506 KiloJoules
534.506 KiloJoules or 534,506 Joules energy required to raise 3.50kg of water from 38.5 to 75.0C
What is sp.heat ?Sp. Heat is the heat required to increase the temperature of the 1 mass of a given substance by a [tex]1^{0}[/tex] C temperature.
The formula of specific heat Cp = [tex]\frac{q}{m (∆T)}[/tex]
Where,
q = energy of substance (Joules / KiloJoules),
Cp = Specific heat capacity of the substance (J/Kg.C),
m = mass of the substance
∆T = Change in temp.
Explanation:
Given data from que: -
Mss of the water (m) = 3.50 Kg = 3.50 × 1000 gm = 3500 gm
specific heat capacity of water (Cp) = 4.184J/g C
Change in temp (∆T) = 75.0 - 38.5 = 36.5
now, put all above given data in formula
we get
Cp = [tex]\frac{q}{m (∆T)}[/tex]
q = Cp ×m×∆T
q = 4.184×3500×36.5
q = 534,506 Joules
q = 534.506 KJ
According to the quantum mechanical model, where are electrons located?
Select one:
A. in orbits around the nucleus
B inside the nucleus
C. at great distances from the nucleus
D. in the cloud-like areas around the nucleus
Answer:
D.) in the cloud-like areas around the nucleus
Explanation:
A.) is incorrect. Electrons exist in orbitals in the Bohr's Model.
B.) is incorrect. Electrons do not exist in the nucleus. They always exist outside of the nucleus, but their exact position has been debated.
C.) is incorrect. While the electron clouds in the quantum mechanical model can cover a relatively large amount of space, the distance from the nucleus is not great. Within this cloud, electrons can exist closer to the nucleus at a particular time.
D.) is correct. Electrons are said to exist somewhere within these clouds around the nucleus. The model uses the cloud references to display how you can never be sure where the electrons are located - they are always moving around.
Two-thirds of a bone's weight is composed of calcium phosphate which interacts with calcium hydroxide to form crystals of __________.
Two-thirds of a bone's weight is composed of calcium phosphate which interacts with calcium hydroxide to form crystals of hydroxyapatite
The two component of bones are 33% organic matter and 67% inorganic matter( Calcium phosphate and hydroxyapatite crystal).Calcium phosphate make up almost 2/3 of the bone's weight.Collagen fibers make up almost 1/3 of the bone's weight.The calcium phosphate interacts with calcium hydroxide to form crystals of hydroxyapatite, whose molecular formula is [tex]Ca_{10} (PO_{4} )_{6} (OH)_{2}[/tex]
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The composition of a given pure compound is always no matter what the source of the compound?
The composition of a given pure compound is always the same no matter what the source of the compound.
A compound seems to be a substance that is entirely made of one kind of molecule.
Every component of compounds shares the same traits and features because of their homogenous makeup. However, because mixtures are composed of several sorts of chemicals, they frequently differ in terms of content, qualities, and samples.
Therefore, the composition of a given pure compound is always the same no matter what the source of the compound.
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The presence of no subscript for an element in a chemical formula means that there is/are?
Answer:
only one atom of that element
Explanation:
Example:
H2 O has two hydrogenatoms and ONE Oxygen atom
The presence of no subscript for an element in a chemical formula means that there is a single atom of that element in the compound.
In a chemical formula, subscripts are used to indicate the number of atoms of each element present in a compound. When an element has no subscript, it means that there is only one atom of that element in the compound.
For example, in the chemical formula H₂O, the subscript 2 indicates that there are two hydrogen atoms present. On the other hand, the absence of a subscript for oxygen means that there is only one oxygen atom in the compound.
Thus, when there is no subscript for an element in a chemical formula, it signifies that there is a single atom of that element in the compound.
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What is a foram and what is curious about the foram fossils of gubbio’s limestone?
Their fossilized shells formed these limestone rocks, which, like Gubbio's mountains, were once at the bottom of the ocean. Now exposed, they represent over a million years of a geological time period known as the Cretaceous.
Walter Alvarez found that forming a distinct boundary between the limestone of the two periods was a thin layer of red clay. Immediately below this clay boundary, the Cretaceous limestone was heavily populated with a wide mix of the fossils of tiny marine creatures called foraminifera, or “foram” for short.
On the Atlantic Coast, outside the town of Zumaia, Dutch geologist Jan Smit was studying the forams from a different ancient sea. Their fossilized shells formed these limestone rocks, which, like Gubbio's mountains, were once at the bottom of the ocean.
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Which term describes the amount of pressure each gas in a mixture contributes to the overall gas pressure?
The term would be partial pressure.
What is the partial pressure of gases?
The partial pressure of a gas refers to the amount of pressure contributed by the gas to the overall pressure of a non-reacting gas mixture.
For example, if a gas is formed from a mixture of two gases A and B. The pressure of the gas would be the sum of the pressure of A and that of B. The pressures that A and B contribute to the overall pressure of the gas are called the partial pressures of A and B respectively.
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5.18 L of nitrogen gas at 76.0°C are cooled to 6.0°C at constant pressure. Calculate the new volume of
the gas.
(write your answer in this space with sig digs and units - submit your work in the work space provided)
Answer:
0.409 L
Explanation:
Because you are dealing with volume and temperature, you need to use the Charles' Law equation:
V₁ / T₁ = V₂ / T₂
In this equation, "V₁" and "T₁" represent the initial volume and temperature. "V₂" and "T₂" represent the final volume and temperature.
V₁ = 5.18 L V₂ = ? L
T₁ = 76.0 °C T₂ = 6.0 °C
V₁ / T₁ = V₂ / T₂ <----- Charles' Law equation
5.18 L / 76.0 °C = V₂ / 6.0 °C <----- Insert values
0.06815789 = V₂ / 6.0 °C <----- Simplify left side
0.409 L = V₂ <----- Multiply both sides by 6.0
Find the density of a substance whose volume is 10.0 mL and whose mass is 5.000 g
Answer:
.5 gm / ml
Explanation:
Density is defined as mass/ volume
so density of this substance is 5 gm / 10 ml = .5 gm/ ml
brittleness is a physical property that differs from one kind of material to another. truefalse
It is true that brittleness is a physical property that differs from one kind of material to another.
Physical qualities of a substance are those that can be seen without changing the substance's identity.
If a material splits under stress with low elastic deformation and little to no substantial plastic deformation, it is considered brittle.
Brittleness is a physical property as it alters the shape of the substance but not the identity of substance.
For example - the brittleness of chalk is different than the brittleness of glass. Thus we can say that the brittleness of chalk's material is different than the brittleness of glass's material.
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What happens to heat energy when it is not increasing the temperature of the substance in the beaker
Answer:
See below
Explanation:
It is melting the ice ( or other solid) at a constant temperature...the solid will absorb heat as it melts but remain at the same temp
How does the phase diagram of a substance illustrate the relationship between temperature and kinetic energy of molecules
A phase diagram combines plots of pressure versus temperature for the liquid-gas, solid-liquid, and solid-gas phase-transition equilibria of a substance.
What is a Phase diagram ?These diagrams indicate the physical states that exist under specific conditions of pressure and temperature, and also provide the pressure dependence of the phase-transition temperatures (melting points, sublimation points, boiling points).
At low temperatures, most substances are solid; as the temperature increases, they become liquid; at higher temperatures still, they become gaseous.The phase change between a liquid and a gas has some similarities to the phase change between a solid and a liquid.Learn more about Phase diagram here:
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A bottle of Nitroglycerin has the labeled strength of l/200 grains. What would this strength be in milligrams
strength in milligrams is 0.3mg
What is Strength?Mass of the solute in grams/Volume of the solution in litres equals the strength of the solution. The overall formula must be multiplied by 1000 if the volume is measured in millilitres (mL). The concentration of the solution, measured in grammes per litre, can be used to determine the solution's strength.
Molarity - The moles of solute per litre of solution is measured as molarity. For instance, when table salt is dissolved in water, water serves as both the solution and the solute. Sodium chloride weights 58.44 grammes per mole. One molar solution, or 1M, is created by dissolving 58.44 grammes of sodium chloride in one litre of water.
Relation between Molarity and Strength?
The volume of solute in one litre of a solution determines its strength. As a result, a solution's strength is calculated by multiplying its molecular mass by its molarity.
1 grain = 64.8 milligrams.
1/200 grains = 64.8/200
= 0.3mg
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A mixture of water and acetone boils at 1.25 atm will boil at 348.15K. Given the vapor pressure of acetone (1.58 atm) and water(0.312 atm), what is the composition of the solution in terms of mole fraction of each chemical present
A mixture of water and acetone boils at 1.25 atm will boil at 348.15K. Given the vapor pressure of acetone (1.58 atm) and water(0.312 atm). 5.06 is the composition of the solution in terms of mole fraction of each chemical present.
What is Raoult's Law ?Raoult's Law is a nonvolatile solute lowers the vapour pressure of the solvent.
It is expressed as:
[tex]P_{\text{soln}} = x_{\text{solvent}} P_{\text{solvent}}[/tex]
where,
[tex]P_{\text{sol}[/tex] = vapor pressure of the solution
[tex]x_{\text{solvent}}[/tex] = mole fraction of the solvent
[tex]P_{\text{solvent}}[/tex] = vapor pressure of the pure solvent
Now put the values in above expression, we get
[tex]P_{\text{soln}} = x_{\text{solvent}} P_{\text{solvent}}[/tex]
[tex]x_{\text{solvent}} = \frac{P_{\text{soln}}}{P_{\text{solvent}}}[/tex]
[tex]= \frac{1.58}{0.312}[/tex]
= 5.06
Thus from the above conclusion we can say that A mixture of water and acetone boils at 1.25 atm will boil at 348.15K. Given the vapor pressure of acetone (1.58 atm) and water(0.312 atm). 5.06 is the composition of the solution in terms of mole fraction of each chemical present.
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Help me ASAP please!!!
The concentration of the sodium hydroxide will be 0.016 M
Stoichiometric problemFirst, the concentration of the diluted nitric acid needs to be found.
m1 = 2.0 M, v1 = 100 mL, v2 = 300.0 mL
m2 = 2 x 100/300 = 0.6667 M
The equation of the reaction goes thus: [tex]HNO_3 + NaOH = NaNO_3 + H_2O[/tex]
The mole ratio is 1:1.
Mole of 0.6667 M, 7.05 mL HNO3 = 0.6667 x 0.00705 = 0.0047 mol
Equivalent mole of NaOH = 0.0047 mol
Molarity of 0.0047 mol, 30.0 mL NaOH = 0.0047/0.3 = 0.016 M
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5. Why is it important to incubate microbe(s) isolated from humans at 37 degrees celsius?
Despite the fact that viruses and ambient bacteria found indoors could both be mesophiles, at 37 degrees Celsius, the temperature of the human body, pathogens would develop more quickly than environmental strains.
A virus would be an infectious submicroscopic creature that only reproduces inside of live cells.
Although bacteria may survive at higher and lower temperatures than humans, they thrive in an environment which really is warm, wet, protein-rich, and pH neutral as well as slightly acidic.
Therefore, Despite the fact that viruses and ambient bacteria found indoors could both be mesophiles, at 37 degrees Celsius, the temperature of the human body, pathogens would develop more quickly than environmental strains.
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Increasing the catalytic stability by optimizing the formation of zeolite-supported Mo carbide species ex situ for methane dehydroaromatization
Answer:
The synthesis of zeolite-supported Mo carbide species was studied by testing different reduction/carburization conditions applied to a zeolite-supported Mo oxide catalyst, with the aim to find the optimized treatment conditions necessary to form stable supported Mo carbide catalysts ex situ for application in methane dehydroaromatization reaction. Four types of treatment were performed and studied using temperature-programmed reduction and carburization profiles: (1) heating the catalyst in a reducing gas, H2, up to reaction temperature and switching to CH4; (2) heating the catalyst in a reducing gas, H2, mixed with dilute CH4; (3) heating the catalyst in CH4 up to reaction temperature; and (4) heating the catalyst in an inert gas (commonly He) up to reaction temperature and then switching to CH4 or to H2 followed by CH4 or to H2/CH4 mixture. Each of these processes were stopped at intermediate points to analyze the phases that were present in order to identify the structural evolution of the supported Mo carbides that originate from the supported Mo oxides. Once the supported carbides were formed, they were quenched under the same gas mixture, and then they were each tested in methane dehydroaromatization via previous heating to reaction temperature in He flow. Despite all of them showing only presence of Mo2C species on HZSM-5, the catalytic properties were dramatically different. Catalysts treated in H2 or CH4/H2 showed remarkably higher stability. These catalysts exhibited a higher Mo dispersion and thus exposure on the active surface.
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The bond_____
covalent bond.
is the actual number of bonded pairs of electrons in a
A covalent bond is the exact number of bonded pairs of electrons in a compound
One electron is added by each atom to a pair of shared electrons in a single bond. While double bonds share only one pair of electrons, triple bonds share three pairs. Bonds with multiple covalent bonds exchange several electron pairs
Covalent bonding happens when atoms share electron pairs. Atoms join together through covalent bonds to form a full electron shell, which boosts stability. By sharing their outermost (valence) electrons, atoms can fill out their outer electron shell and become stable. Nonmetals will swiftly create covalent bonds with other nonmetals in order to achieve stability.
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In an aqueous solution containing Mn(II) and Mn (IV) salts, which cation would you expect to be the more strongly hydrated
In an aqueous solution containing Mn(II) and Mn (IV) salts, Mn (IV) cation is expected to be the more strongly hydrated.
A chemical event called hydration occurs when two substances interact with water. Since Mn (IV) has a stronger cation with a +4 charge than Mn (II), it will draw more oxygen ions from the Mn(II) in aqueous solution. Mn(IV) will consequently be more intensely hydrated.
Another reason for this is that Mn(IV) ions are often smaller than ions. Now, if we take a look at the element that significantly influences hydration, it is ion size. Therefore, the ion will be more hydrated if it is smaller.
So, In an aqueous solution containing Mn(II) and Mn (IV) salts, Mn (IV) cation is expected to be the more strongly hydrated.
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Which of the following results in an increase in the entropy? (4 points)
Freezing water
Cooling a solid
Condensing water vapor
Dissolving sugar in water
Dissolving sugar in water results in an increase in the entropy.
Hence, Option (D) is correct answer.
What is Entropy ?Measurement of randomness of a system is called entropy. It is an extensive property. It is a state function. Unit of entropy is JK⁻¹ mol⁻¹.
Now lets check all options one by one
Option (A): Freezing water
Freezing water decreases the entropy because here second law of thermodynamics does not violate.
So it is incorrect option
Option (B): Cooling water
Cooling water does not increases entropy because entropy increases when solid melts to give liquid.
So it is incorrect option
Option (C): Condensing water vapour
In Condensing water vapour the temperature of liquid phase decreases and thus kinetic energy decreases. The randomness will decrease and hence entropy will also decrease.
So it is incorrect option.
Option (D): Dissolving sugar in solute
In dissolving sugar in solute the solid dissociates to ions and the randomness will increase and hence entropy will also increase.
So it is correct option
Thus from the above conclusion we can say that Dissolving sugar in water results in an increase in the entropy.
Hence, Option (D) is correct answer.
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Give the coordination number and the charge of the central metal ion in each coordination compound: For the charges, enter your answers with the correct sign. e.g. if you think the answer is 1, enter the positive sign followed by the number 1. Na2[Zn(OH)4] coordination number
The coordination number shows the number of ligands attached to the central metal.
What is complex in coordination compound?A coordination complex is the product of a Lewis acid-base reaction in which neutral molecules or anions (called ligands) bond to a central metal atom (or ion) by coordinate covalent bonds. Ligands are Lewis bases - they contain at least one pair of electrons to donate to a metal atom/ion.A complex is a coordination compound which contains a central metal atom or ion. The coordination number refers to the number of ligands in the complex. The coordination number usually influences the geometry of the complex compound.The coordination number and the charge on the central metal in each of the complexes are shown below;
Na2[Zn(OH)4] - The coordination number of the complex is 4 and the charge on the central metal ion is +2.
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Which of the following is the best definition of a chemical change?
A. All of these
B. The ability of something to undergo a change or reaction.
C. A change that alters the identity, or chemical composition, of a substance at the atomic level.
D. Something that can be observed or measured without changing the identity of the substance.
Chemical changes are changes that alter the identity or the chemical composition of substances at the atomic level.
What are chemical changes?When a substance changes chemically, the identity of the substance changes.
In other words, chemical changes are changes that occur to substances such that the entire chemical properties of the substances change.
These changes happen at the atomic levels of substances. Sometimes, the changes can also be physical as well.
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