Free energy change, denoted by ΔG, is a measure of the amount of work that a thermodynamic system can perform. It is calculated as the difference between the change in enthalpy (ΔH) and the product of the temperature (T) and the change in entropy (ΔS). ΔG° is negative, the reaction is spontaneous.
To calculate the free energy change for a reaction at a certain temperature, we use the equation ΔG = ΔH - TΔS, where ΔH is the change in enthalpy, T is the temperature in Kelvin, and ΔS is the change in entropy.
Since we are assuming that all reactants and products are in their standard states, we can use the standard enthalpy of formation (ΔH°f) and standard entropy (ΔS°) values from tables.
Let's take an example reaction: A + B → C
Assuming the standard states for A, B, and C, and using the given values from tables, we can calculate the free energy change at 25°C as:
ΔG° = ΣnΔG°f(products) - ΣnΔG°f(reactants)
ΔG° = ΔG°f(C) - ΔG°f(A) - ΔG°f(B)
Let's say the values we get are:
ΔG°f(A) = 50 kJ/mol
ΔG°f(B) = 80 kJ/mol
ΔG°f(C) = 100 kJ/mol
Substituting these values into the equation, we get:
ΔG° = 100 - (50 + 80)
ΔG° = -30 kJ/mol
Since ΔG° is negative, the reaction is spontaneous. This means that the products (C) are more stable than the reactants (A and B) and the reaction will occur without any external intervention.
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To calculate the free energy change for a reaction, we use the equation ∆G = ∆H - T∆S, where ∆H is the change in enthalpy, T is the temperature in Kelvin, and ∆S is the change in entropy.
Assuming we have all reactants and products in their standard states, we can look up their standard enthalpies of formation (∆H°f) and standard entropies (∆S°) from a table.
Let's say we have the reaction A + B → C + D and the following values:
∆H°f(A) = -100 kJ/mol
∆H°f(B) = -50 kJ/mol
∆H°f(C) = 200 kJ/mol
∆H°f(D) = 0 kJ/mol
∆S°(A) = 50 J/mol*K
∆S°(B) = 100 J/mol*K
∆S°(C) = 150 J/mol*K
∆S°(D) = 75 J/mol*K
We can calculate the change in enthalpy (∆H) by subtracting the sum of the enthalpies of the reactants from the sum of the enthalpies of the products:
∆H = (∆H°f(C) + ∆H°f(D)) - (∆H°f(A) + ∆H°f(B))
∆H = (200 + 0) - (-100 - 50)
∆H = 350 kJ/mol
We can also calculate the change in entropy (∆S) by subtracting the sum of the entropies of the reactants from the sum of the entropies of the products:
∆S = (∆S°(C) + ∆S°(D)) - (∆S°(A) + ∆S°(B))
∆S = (150 + 75) - (50 + 100)
∆S = 75 J/mol*K
Now we can use the equation ∆G = ∆H - T∆S to calculate the free energy change (∆G) at 25 °C (298 K):
∆G = ∆H - T∆S
∆G = 350000 - 298 * 75
∆G = 129050 J/mol or 129.05 kJ/mol
If ∆G is negative, the reaction is spontaneous (i.e. it will occur without external input of energy). In this case, ∆G is negative, so the reaction is spontaneous.
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Match the instrument described below with the decimal place of the
value to which this instrument must be recorded.
our meter stick
our quadruple beam scale
a 100 mL cylinder
a 1 L cylinder
The decimal place value of these instrument must be recorded as (i) our meter scale = 1 (ii) our quadruple beam scale = 0.001 (iii) a 100 mL cylinder = 1 (iv) a 1 L cylinder = 0.001.
What is Meter Stick ?Meter stick which is used to measure the length especially used in the construction industry. The meter stick is 1 meter long. The metric unit for length is meter.
What is Quadruple beam scale ?This is the instrument which is used to measure the mass very precisely. In quadruple beam scale the reading error is 0.001.
Thus from the above conclusion we can say that The decimal place value of these instrument must be recorded as (i) our meter scale = 1 (ii) our quadruple beam scale = 0.001 (iii) a 100 mL cylinder = 1 (iv) a 1 L cylinder = 0.001.
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Question: Match the instrument described below with the decimal place of the value to which this instrument must be recorded. ( 1 , 0.01 , 0.001 , 0.1 , 10 choose)
our meter stick =
our quadruple beam scale =
a 100 ml cylinder=
a 1 L cylinder=
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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Calculate your % yield of co2 in the reaction based on the grams of nahco3 being the limiting reagent in the reaction.
The percent yield of CO₂ is 93.3%.
What is the percent yield of CO₂?The percent yield of a substance is given as follows:
Percent yield = actual yield/theoretical yield * 100 %The equation of the reaction is used to determine the theoretical yield.
NaHCO₃ + CH₃COOH → CH₃COONa + H₂O + CO₂Moe ratio of sodium bicarbonate and CO₂ is 1 : 1.
Given that sodium bicarbonate is the limiting reactant, the theoretical yield of CO₂ will be:
Moles of NaHCO₃ reacting = 2.01/84 = 0.0239 moles
Theoretical yield of CO₂ = 0.0239 moles * 22.4L/mol = 0.536 L
Actual yield = 0.50 L
Percent yield = 0.50/0.536 * 100%
Percent yield = 93.3%
In conclusion, the percent yield is the ratio of the actual yield and theoretical yield.
Note that the complete question is given below:
Calculate your % yield of co2 in the reaction based on the grams of nahco3 being the limiting reagent in the reaction between 2.01 g of sodium bicarbonate and 24.6 mL of 1.5 M acetic acid? They produce 0.50 L of at s.t.p.
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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
Which molecules are types of lipids?
Answer: The answer is fatty acids and triglycerides
Explanation:
How many moles of MgCl₂ are present in 60.0 mL of 0.100 M MgCl₂ solution?
There is 0.0600moles of MgCl2 in 60.0ml of 0.100M MgCl2 solution.
Explanation:
First we need to determine the number of moles of MgCl2 in 60.0L of solution.
After determining the number of moles,now multiply moles of MgCl2 by its Molar mass i.e (95.205g/mol)
We know Molarity= mol of solute/L solution
∴ 0.10 M MgCl2 = 0.10mol MgCl2/L
Step1:
First convert 60.0ml to litres.
1L=1000mL
60.0mL×1L/1000mL=0.0600L
Step2:
To determine moles of MgCl2, multiply 0.0600 L by the molarity of the solution
0.0600L×0.10mL/1L=0.0600mol MgCl2
∴ 0.0600moles of MgCl2 are present in 60.0mL of 0.100M MgCl2 solution.
what is molar mass?Relative molar mass is defined as the smallest mass unit of a compound with one twelfth of the mass of one carbon – 12 atom.
In a substance, the amount of entities present for e.g. atoms, molecules, ions, is defined as a mole. A mole of any substance is 6.022×1023 molecules. Just as we take a standard value to calculate different things e.g. 1 dozen =12 items similarly we use the mole to calculate the size of the smallest entities quantitatively.
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what is molarity?Molarity of a solution is defined as the number of moles of the solute dissolved per litre of the solution. I is represented as \textbf{`M`}. Thus a solution, which contains one gram mole of the the solution dissolved per litre* of the solution is regarded as molarity.
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Given the incomplete equation for the combustion of ethane (C2H6): 2 C2H6 7 O2 --> 4 CO2 6 ___ Group of answer choices
The correct option is D. H2O.
For the combustion of ethane (C2H6); the chemical equation is;
2 C2H6 + 7 O2 --> 4 CO2 + 6 H2O.
All hydrocarbons go through combustion processes, and the only byproducts are water (H2O) & carbon dioxide (CO2).
What is hydrocarbons?Any of a group of organic molecules with only the atoms carbon (C) & hydrogen are known as hydrocarbons (H). The hydrogen atoms bind to the carbon atoms in a variety of ways to create the compound's structural framework. chemical mixture.
The classification of hydrocarbons are done by-
It is not necessary for a substance to be classified into a single class; rather, this categorization of hydrocarbons is meant to help in the association of structural traits with properties. In fact, it is typical for molecules to contain structural elements that are unique to two or even more hydrocarbon families. For instance, a molecule with a benzene ring and a carbon-carbon triple bond would have certain features that are typical of alkynes and some that are typical of arenes.Alkenes, alkynes, and aromatics are referred to as unsaturated hydrocarbons, whilst alkanes are regarded as saturated hydrocarbons.To know more about hydrocarbons, here
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The complete question is -
Given the incomplete equation for the combustion of ethane (C2H6): 2 C2H6 + 7 O2 --> 4 CO2 + 6 ___
Group of answer choices:
A. H2O2
B. HCOOH
C. CH3OH
D. H2O
Vanillin the flavoring agent in vanilla has a mass percent composition of 63.15 per h ,31.55per o. determine the empirical formula and molecular formula if molecular mass of vanillin is 152.15 g/mol
Empirical formula and Molecular formula:
Vanillin has the empirical formula C₈H₈O₃ and the molecular formula C₈H₈O₃, they both are same.
What is Vanillin?
Vanillin has the chemical formula C₈H₈O₃ and is classified as an organic compound. It is an aldehyde that is phenolic. Ether, hydroxyl, and aldehyde are some of their functional groups. It is the key ingredient in vanilla bean extract.C, H, and O are present in this compound,
Mass percent composition = Divide by their atomic mass
C = 63.15/12.0107 = 5.2578
H = 5.30/1.0079 = 5.2582
O = 31.55/16 = 1.9719
Thus, the ratio of
carbon : hydrogen : oxygen
5.257811784 : 5.258249499 : 1.97199825
division of all numbers by the smallest we get,
2.666235523 : 2.666457488 : 1
further dividing it by 3 we get,
7.998706568 : 7.999372463 : 3
thus the ratio becomes 8:8:3
Therefore, the empirical formula is C₈H₈O₃
Empirical formula mass = (12x8) + (1x8) + (16x3)
= 96 + 8 + 48
= 152
n = Molecular mass of Vanillin/ Empirical formula mass
= 152.15/152
= 1.0009
Since the n-value is near to 1 thus the molecular formula will also be the same.
Therefore the molecular formula = C₈H₈O₃
Note: Your question is incomplete, but most probably your full question was Vanillin the flavoring agent in vanilla has a mass percent composition of 63.15 per h ,31.55per o and 5.30%H. determine the empirical formula and molecular formula if molecular mass of vanillin is 152.15 g/mol
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Oxidizing acids, such as nitric acid, can explode when mixed with what type of incompatible chemical? air water organic chemicals or materials compressed gases
Oxidizing acids, such as nitric acid, can explode when mixed with what type of incompatible chemicals like alcohol, or charcoal.
An oxidizing acid is a Brønsted acid that is a strong oxidizing agent. most Brønsted acids can act as oxidizing agents because the acidic proton can be reduced to hydrogen gas. a few acids include other structures that act as stronger oxidizing agents than hydrogen ions.
Oxidizing acids include concentrated perchloric acid, nitric acid, iodic acid, chromic acid, and the glass cleansing mixture of chromium trioxide and sulfuric acid.
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He nitrogen cycle is one of the most important (and complex!) of the biogeochemical cycles. Why is nitrogen important?
Nitrogen is an essential part of proteins and nucleic acids (DNA).
Why is nitrogen important?All living things require nitrogen. It is a part of proteins, ATP, chlorophyll, DNA, and RNA. Given that it makes up a significant portion of the structures of biomolecules in living organisms, its synthesis and consumption in the biogeochemical cycle are of highest importance. Proteins are made up of amino acids (NH2 group).
The structural development of living species' genetic material (DNA, RNA) also involves nitrogen. It is a part of the nitrogenous bases, which together with other nucleotides create RNA and DNA.
Therefore, a nitrogen deficit can cause major structural issues for such an organism.
What happens if nitrogen cycle is disrupted?A number of undesirable consequences can result from the nitrogen cycle being disrupted. For instance, an abundance of nitrogen in aquatic systems leads to eutrophication. Acid rain can be caused by a rise in atmospheric nitrogen.
The majority of ecosystems can tolerate low nitrogen levels since the majority of nitrogen is not biologically accessible in nature. Ecosystems become out of balance when humans significantly increase the quantity of nitrogen that is accessible through fertilizers, fertilizer use, and other means.
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You can use mass percent composition as a conversion factor between grams of a constituent element and grams of the compound. Write the conversion factor (including units) inherent in each mass percent composition. (a) Water is 11.19% hydrogen by mass. (b) Fructose, also known as fruit sugar, is
You can use mass percent composition as a conversion factor between grams of a constituent element and grams of the compound. The conversion factor in each mass percent composition are (a) 11.19 g H‚ 100 g H₂O (b) 53.29 g O‚100 g fructose (c) 84.12 g C‚100 g octane (d) 52.14 g C‚100 g ethanol
What is the Mass Percent ?The percent by mass of each element present in a compound is called Mass Percent.
(a) Water is 11.19% hydrogen by mass.
Here it is given mass of hydrogen is 11.19 %. That means 11.19 % of solute should be added in 100 g H₂O.
(b) Fructose, also known as fruit sugar, is 53.29% oxygen by mass.
Here it is given mass of oxygen is 53.29 %. That means in 53.29% of solute should be added in 100 g fructose.
(c) Octane, a component of gasoline, is 84.12% carbon by mass.
Here it is given mass of carbon is 84.12 %. That means in 84.29% of solute should be added in 100 g Octane.
(d) Ethanol, the alcohol in alcoholic beverages, is 52.14% carbon by mass.
Here it is given mass of carbon is 52.14 %. That means in 52.14% of solute should be added in 100 g Ethanol.
Thus from the above conclusion we can say that You can use mass percent composition as a conversion factor between grams of a constituent element and grams of the compound. The conversion factor in each mass percent composition are (a) 11.19 g H‚100 g H2O (b) 53.29 g O‚100 g fructose (c) 84.12 g C‚100 g octane (d) 52.14 g C‚100 g ethanol
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Question: You can use mass percent composition as a conversion factor between grams of a constituent element and grams of the compound. Write the conversion factor (including units) inherent in each mass percent composition.
(a) Water is 11.19% hydrogen by mass.
(b) Fructose, also known as fruit sugar, is 53.29% oxygen by mass.
(c) Octane, a component of gasoline, is 84.12% carbon by mass.
(d) Ethanol, the alcohol in alcoholic beverages, is 52.14% carbon by mass.
There are exactly 1000 m in 1 km. how many significant figures does this number have?
Answer:
There is 1 significant figure
Explanation:
In the number 1000, 1 is the only number that counts as a significant figure since the zeros are not in between two non-zero numbers, and there isn't a decimal place either.
You have a 150mL sample of an aqueous solution at 25C. It contains 15.2mg of an unknown nonelectrolyte compound. If the solution has an osmotic pressure of 8.44 torr, what is the molar mass of the compound
The molar mass of the compound:
If the solution has an osmotic pressure of 8.44 torr, then the molar mass of the unknown non-electrolyte is 223.14 g.
What is osmosis?
Osmosis is defined as the flow of solvent molecules through semi-permeable membrane.Osmotic pressure is the pressure applied to stop the flow of solvent molecules.It is a colligative property that means osmotic pressure depends on the number of solute particles .Therefore,
π[tex]V=inRT[/tex] ( for electrolytes)
Where, π= Osmotic pressure
i = Van 't Hoff factor
n= moles
R= Gaseous constant = 62.363577 L torr [tex]mol^{-1}K^{-1}[/tex]
T= Temperature
V= Volume of solution
Given:
T= 298K
V= 150 mL= 0.150 L
Given mass of unknown electrolyte= 15.2 mg = 15.2 x [tex]10^{-3}[/tex] g
Osmotic pressure= 8.44 torr
Molar mass= ?
For non-electrolytes:
πV = n RT
πV=[tex]\frac{m}{M}[/tex]RT
Calculations:
Putting the given values in the formula:
8.44 x 0.150 =15.2 x [tex]10^{-3}[/tex]/ M x 62.36 x 298
1.266 = 282.5/M
M = 282.5/1.266
M = 223.14 g
Therefore,
The molar mass of the unknown non-electrolyte is 223.14g.
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an acid accepts H and removes them from a solution, is a solution where the water molecules are intact
When placed in water, acids, bases, and salts dissociate (separate) into electrolytes (ions). Salts dissociate into a cation (that is not H+) and an anion (that is not OH-), whereas acids and bases dissociate into H+ and an anion. An acid separates into anions and hydrogen ions (H+). Strong acids produce a high concentration of H+ by dissociating every single one of their molecules . Water-based solutions,
Acid:
When a material or chemical is in solution, it releases hydrogen ions (H+), which are known as acids. All hydrogen ions (H+) and chloride ions (Cl-), which are normally bound together by ionic bonding, dissociate (separate) in water when exposed to a strong acid like hydrochloric acid (HCl). Only some ions disintegrate into hydrogen ions (H+) and bicarbonate ions (HCO3-) in a weak acid like carbonic acid (H2CO3), while others are still bound together by ionic bonds.
Define base?
A base is a chemical that, when in solution, emits hydroxyl ions -{OH). We can also define a base as a substance that releases hydroxyl ions (OH-), which mix with any hydrogen ions (H+) in the solution to generate water molecules (OH- + H+ = H2O).
Therefore, a substance that receives or accepts hydrogen ions (H+) that are already present in the solution qualifies as a base.
Because it totally dissociates into sodium ions (Na+) and hydroxyl ions (OH-) when placed in water, sodium hydroxide (NaOH), which is a strong base, is now liberated and dissolves in water.
c
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calculate the number of moles in 2 kg of iron
Answer:
111600 moles
Explanation:
Number of moles= Mass ×Mr, where Mr is the relative molecular mass of the substance of interest. Note that the mass is calculated in terms of grams (1 kg= 1000 g), while the Mr can be found using the periodic table.
Mass of iron
= 2 kg
= 2(1000)
= 2000 g
Mr of iron= 55.8
Number of moles
= 2000(55.8)
= 111600 mol
Additional:
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https://brainly.com/question/21042927How 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.
when gas evolution becomes very slow, heat the solution gently in the hood, then allow it to cool. What gas is formed in this reaction
Nitrogen gas is formed in this reaction.
Nitrogen gasAtomic number 7 and the letter N designate nitrogen as the chemical element. Group 15 of the periodic table, often known as the pnictogens, contains nitrogen as the lightest nonmetal element. It ranks eighth in overall abundance in the Milky Way and the Solar System, making it a common element in the cosmos. Two of the element's atoms combine to create the colorless and odorless diatomic gas N2 at standard temperature and pressure. The most common element that isn't mixed, N2 makes up around 78 percent of the Earth's atmosphere. All living things contain nitrogen, which is mostly found in amino acids (and thus proteins), nucleic acids (DNA and RNA), and the energy-transfer molecule adenosine triphosphate.
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Determine the number of moles in 50.0 grams of sodium. (the mass of one mole of sodium is 22.99 g.)
Answer:
2.17 moles
Explanation:
50 gm / 22.99 g / mole = 2.17 moles
Answer:
2.17
Explanation:
What is Atom??????????
An atom is a particle of matter that uniquely defines a chemical
element. An atom consists of a central nucleus that is usually surrounded by one or more electrons. Each electron is negatively charged. The nucleus is positively charged, and contains one or more relatively heavy particles known as protons and neutrons.
Ethene is exposed to h2 in a solution containing a chunk of solid palladium. if it reacts successfully, the original alkene will:________
If ethene and hydrogen reacts successfully in a solution containing a chunk of solid palladium, the original alkene will become unsaturated.
What is hydrogenation?The term hydrogenation is used in chemistry to describe that addition of hydrogen to an unsaturated compound. Recall that ethene is an un saturated compound (alkene) and one of the reactions that an unsaturated compound can undergo is the addition of atoms or group across the double bond to yield adducts.
In this case, the adduct is a compound that is saturated ad will not have the same properties as ethene because the carbon carbon double bond that was characteristic of ethene has been replaced by a carbon carbon single bond.
Thus, if ethene and hydrogen reacts successfully in a solution containing a chunk of solid palladium, the original alkene will become unsaturated.
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What product is used in a pedicure bath to cleanse and soften the skin? a foot masque a foot soak massage oil cuticle remover submitnext
The product which is used in a pedicure bath to cleanse and soften the skin is foot soak
What is skin pedicure?Skin pedicure is a special and cosmetic treatment of the body's skin including the feet and toenails, analogous to a manicure.
So therefore, the product which is used in a pedicure bath to cleanse and soften the skin is foot soak
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Which best describes the oxidizing agent in this reaction?
Cl2(aq) + 2Br–(aq) Right arrow. 2Cl–(aq) + Br2(aq)
Bromine (Br) is the oxidizing agent because it gains an electron.
Bromine (Br) is the oxidizing agent because it loses an electron.
Chlorine (Cl) is the oxidizing agent because it gains an electron.
Chlorine (Cl) is the oxidizing agent because it loses an electron.
For the reaction Cl₂(aq) + 2 Br⁻(aq) ⇒ 2Cl⁻(aq) + Br₂(aq), Chlorine (Cl) is the oxidizing agent because it gains an electron.
What is the oxidizing agent?In a redox reaction, the oxidizing agent is the one that gains electrons, causing the other element to oxidize.
Let's consider the following redox reaction.
Cl₂(aq) + 2 Br⁻(aq) ⇒ 2Cl⁻(aq) + Br₂(aq)
The corresponding half-reactions are:
Reduction: 2 e- + Cl₂(aq) ⇒ 2Cl⁻(aq)
Oxidation: 2 Br⁻(aq) ⇒ Br₂(aq) + 2 e-
Which best describes the oxidizing agent in this reaction?
Bromine (Br) is the oxidizing agent because it gains an electron. NO. Br is the reducing agent.Bromine (Br) is the oxidizing agent because it loses an electron. NO. Br is the reducing agent.Chlorine (Cl) is the oxidizing agent because it gains an electron. YES.Chlorine (Cl) is the oxidizing agent because it loses an electron. NO. Cl gains electrons.For the reaction Cl₂(aq) + 2 Br⁻(aq) ⇒ 2Cl⁻(aq) + Br₂(aq), Chlorine (Cl) is the oxidizing agent because it gains an electron.
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Answer:
C: Chlorine (Cl) is the oxidizing agent because it gains an electron.
Explanation:
es endotermica o exotermica? naoh (ac) + hcl (ac) --> nacl (ac) + h2o (l) + 58.4 kj
Answer:
Exothermic
Explanation:
Reactions which are endothermic require heat. Reactions which are exothermic release heat as a product. Therefore, since heat is a product in this reaction (58.4 kJ), it is exothermic.
Remember,
reactants ---> products
The graph below shows how the pH of the soil in
a farmer's field changed over a period of time.
At which point, A, B, C or D, did the farmer apply
lime to the field?
Answer:
Point B
Explanation:
From 0 - 7 on the pH scale, substances are said to be acidic. At 7, the substance is said to be neutral. From 7 - 14, substances are basic.
Lime is a basic substance. Therefore, when it is added to the soil, one should expect that the soil becomes more basic. On the graph, this should be represented by the line increasing in pH. As such, the point at which lime was added was most likely Point B.
What amino acid residue present in the specificity pocket allows trypsin to bind to peptides containing arg or lys?
The amino acid residue present in the specificity pocket allows trypsin to bind to peptides containing arg or lys will be "Asp".
Chymotrypsin breaks down peptide bonds following side chains with a lot of mass or fragrance, like those found in the amino acids phenylalanine as well as tyrosine. The substrate-binding site, also known as the specificity pocket, contains deep and features hydrophobic side chains.
A medium-sized globular protein called trypsin, also known as serine protease 1, serves as a pancreatic serine protease. This enzyme breaks down peptides on the C-terminal portion of the amino acid sequences lysine as well as arginine to hydrolyze bonds.
Therefore, the amino acid residue present in the specificity pocket allows trypsin to bind to peptides containing arg or lys will be "Asp".
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__Pb(NO3)2 + __NaCI = __NaNO3 + __PbCI2
Answer:
Pb(NO3)2 + 2NaCl = 2NaNO3 + PbCl2
4. A 0.51 kg solution contains 87 mg of potassium iodide. Calculate the W/W concentration
of this solution.
Taking into account the definition of percentage composition, the percent composition of potassium iodide in this sample is 0.017%.
Definition of percent compositionThe Percentage Composition is a measure of the amount of mass that an element occupies in a compound and indicates the percentage by mass of each element that is part of a compound.
To calculate the percentage of composition, it is necessary to know the mass of the element in a known mass of the compound.
Percentage Composition in this caseIn this case, you know that a 0.51 kg (or 510000 mg, being 1 kg= 1000000 mg) solution contains 87 mg of potassium iodide.
Dividing the mass amount of potassium iodide present in the compound by the mass of the sample and multiplying it by 100 to obtain a percentage value, the percentage composition of potassium iodide is obtained:
[tex]percentage composition of potassium iodide=\frac{87 mg}{510000 mg} x100[/tex]
percentage composition of potassium iodide= 0.017%
Finally, the percent composition of potassium iodide in this sample is 0.017%.
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Briefly explain how you would name an organic compound containing each of the functional groups.
Functional groups include hydroxyl, methyl, carbonyl, carboxyl, amino, phosphate, and sulfhydryl.
Functional groups:
Regardless of the other atoms in a molecule, functional groups are particular groupings of atoms within molecules that have their own distinctive capabilities.
The prefixes di, tri, and tetra are applied when there are several substituents. Function-specific groups contain identifying suffixes. For instance, the parent chain name of alcohols has the suffix "ol" and a number indicating the location of the hydroxyl group. One is used to identify ketones.
If a compound has multiple functional groups, the highest priority functional group will be considered the "parent structure" and will define the "parent name"; the remaining functional groups will be considered the "substituents." The name of the parent structure is denoted by the "suffix," and the substituent is denoted by the "prefix."
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Conclusion: why do you think it is important to record your data with all the decimals provided by the instruments even if they are zero? How does this help with data analysis?
Since volume and temperature are constant, this means that pressure and_____are____proportional. the sample with the largest____will have the_____pressure.
Since volume and temperature are constant, this means that pressure and number of moles are directly proportional. the sample with the largest number of moles will have the high pressure.
Since, the ideal gas equation is also called ideal gas law. So, according to ideal gas equations,
PV = nRT
P is pressure of the sampleT is temperatureV is volume n is the number of molesR is universal gas constantAt constant volume and temperature the equation become ,
P ∝ nR
since, R is also constant. So, conclusion of the final equation is
P ∝ n
The number of moles and pressure of the sample is directly proportion. So, on increasing number of moles in the sample , pressure of the sample also increases.
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