The correct answer is O(a) describes a transition-state complementarity model, whereas (b) describes a strict "lock and key" model.
The two reaction coordinate diagrams given represent two different models that describe the catalysis of enzyme-catalyzed reactions. Both models have a single intermediate which is the ES complex. In each case, the contribution of binding energy is given, which is 5 in (a) and by 7 in (b). The ES complex is given by 2 in (a) and 4 in (b). The activation energy for the uncatalyzed reaction is given by 5+6 in (a) and by 7+4 in (b). The models presented in the diagrams are the transition-state complementarity model (a) and the strict "lock and key" model
(b). The two models are different from each other. They differ based on the mechanism by which the enzyme catalyzes the reaction. The lock-and-key model assumes that the active site of the enzyme is rigid and complementary to the substrate that fits into it. The substrate is said to "fit" into the active site of the enzyme as a lock fits into a key. In the transition-state complementarity model, the enzyme's active site has flexibility, which allows it to interact with the substrate in such a way that it stabilizes the transition state, reducing the energy required to reach it. The activation energy for the catalyzed reaction is 5 in (a) and is 7 in (b).
Hence, the correct answer is O(a) describes a transition-state complementarity model, whereas (b) describes a strict "lock and key" model.
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Calculate ΔHrxn for
Ca(s) + 1/2 O2(g) + CO2(g) → CaCO3(s)
given the following set of reactions:
Ca(s) + 1/2 O2(g) →CaO(s) ΔH = −635.1 kJ
CaCO3(s) → CaO(s) + CO2(g) ΔH = 178.3 kJ
_____ kJ
The enthalpy change of the reaction is -456.8 kJ.
The balanced chemical equation of the reaction is as follows:
Ca(s) + 1/2O2(g) + CO2(g) → CaCO3(s)
Given reactions:
Ca(s) + 1/2O2(g) → CaO(s) ΔH = -635.1 kJ/mol
CaCO3(s) → CaO(s) + CO2(g) ΔH = 178.3 kJ/mol
The target reaction is a combination of the two given reactions, hence the enthalpy change of the target reaction is the sum of the enthalpies of the two given reactions. It means that:
ΔHrxn = ΔH1 + ΔH2
We have:ΔH1 = -635.1 kJ/mol
ΔH2 = 178.3 kJ/mol
Therefore,ΔHrxn = ΔH1 + ΔH2= (-635.1 kJ/mol) + (178.3 kJ/mol)= -456.8 kJ/mol
Therefore, the enthalpy change of the reaction is -456.8 kJ.
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What would be the most effective way for a scientist to get an idea of the actual age of a rock?
Answer:
Radiometric dating
Explanation:
Radiometric dating would be the most effective way since it is a technique that can establish the age of objects older than a few thousand years.
when was the element copper discovered? Who discovered the element copper?
The Mesopotamians discovered copper (Cu) in 9000 BC.
what is motion of a force in kinetic energy
Answer:
Kinetic energy, form of energy that an object or a particle has by reason of its motion. If work, which transfers energy, is done on an object by applying a net force, the object speeds up and thereby gains kinetic energy.
Use the drop-down menu to complete the statement. This is why they have similar Atoms of elements in the same group have the same number of chemical properties.
Answer:
valence electrons
Explanation:
i just took the test
What type of reaction does this model represent?
1. single replacement
2. double replacement
3. Decomposition
4. double displacement
Answer:
1. single replacement
Explanation:
Single replacement can be represented by AB+C ⇄B+AC, which matches the picture
Double replacement and double displacement are the same kind of reaction and can be represented by AB+CD ⇄BD+AC
Decomposition reaction can be represented by AB ⇄A+B
Write a question here it’s simple.
Answer:
what type of question?
Explanation:
whats your favorite color???
What is the relationship between temperature and volume if pressure is held constant?
A. inverse
B. direct
Answer:
A. inverse
Explanation:
Boyle's Law is a relationship between pressure and volume. In this relationship, pressure and volume have an inverse relationship when temperature is held constant. If there is a decrease in the volume there is less space for molecules to move and therefore they collide more often, increasing the pressure.
How many moles are in 19.82 g Mg?
A chemist wants to make a gas-liquid solution. However, the gas will not dissolve readily into the liquid solvent. Which step would MOST likely increase the solubility of the gas in the liquid solvent?
A) Expand the volume of the liquid.
B) Increase the temperature of the gas and liquid.
C) Lower the pressure of the gas above the liquid.
D) Increase the pressure of the gas above the liquid.
Answer:
B
Explanation:
Can't really explain it sorry buy heating the solvent tends to increase the solubility
The step that would increase the solubility of the gas in the liquid solvent is to increase the temperature of the gas and liquid.
What is solubility?Solubility is the mixing of any substance into another substance and the fully mixing of the ions of the substance to another substance's ions.
Solubility depends upon temperature, increasing temperature increase the solubility.
In the mixing of gas and liquid, the liquid is solvent and gas is solute, always.
Thus, the correct option is B.
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Which of the following chemical reactions is most likely to have the largest equilibrium constant K?
A. CH3COOH(aq) + H2O(l) CH3COO- (aq) + H3O+(aq)
B. HCl(aq) + H2O(l) H3O+(aq) + Cl-(aq)
C. H3PO4(aq) + NH3(aq) H2PO4-(aq) + NH4+(aq)
D. CH3COO- (aq) + H2O(l) CH3COOH(aq) + OH-(aq)
Answer:
The answer to this question is HCl(aq) + H2O(l) = H3O+(aq) + Cl-(aq). HCl is considered a strong acid meaning it is 100% ionized in solution. The equilibrium constant is therefore very large.
Just as all the organs in a system work together, the various body
systems work together in a healthy person. Can you think of an
example of two systems and how they work together? Explain
your ideas.
Answer:
the lungs and heart give oxygen to the cells and the sensory system gives messages to the brain
Explanation:
Consider the following balanced reaction: 4Fe + 302 → 2Fe2O3. If 3.2
g of oxygen gas and 3.2 grams of iron are used in this reaction, which
one is the limiting reactant?
O Iron
O Oxygen gas
O Iron III oxide
O None of the above
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a 20.-milliliter sample of 0.60 m hcl is diluted with water to a volume of 40. milliliters. what is the new concentration of the solution?
The new concentration of the solution is 0.30 M.
To calculate the new concentration of the solution, we need to consider the dilution process.
Given information:
Initial volume of the HCl solution = 20 mL
Initial concentration of the HCl solution = 0.60 M
Final volume of the diluted solution = 40 mL
The number of moles of HCl in the initial solution can be calculated using the formula:
Moles = Concentration × Volume (in liters)
Initial moles of HCl = 0.60 M × (20 mL / 1000 mL/L) = 0.012 moles
During dilution, the moles of solute remain constant. Therefore, the moles of HCl in the diluted solution will also be 0.012 moles.
The final concentration of the solution can be calculated using the formula:
Final Concentration = Moles / Volume (in liters)
Final concentration = 0.012 moles / (40 mL / 1000 mL/L) = 0.30 M
Therefore, the new concentration of the solution after dilution is 0.30 M.
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Consider the reaction of (CH3)3CO- with iodomethane or 1-chlorobutane. Will the reaction rate increase, decrease, or remain the same if the concentration of iodomethane is increase? Explain
The reaction of (CH₃)₃CO- with iodomethane or 1-chlorobutane will increase the reaction rate due to an increased frequency of collisions and an increased concentration of electrophiles.
The reaction between (CH₃)₃CO- (tert-butoxide ion) and iodomethane or 1-chlorobutane is an example of an SN₂ nucleophilic substitution reaction. In SN₂ reactions, the rate-determining step involves the simultaneous attack of the nucleophile (tert-butoxide ion) on the electrophile (iodomethane or 1-chlorobutane) with the inversion of configuration.
When the concentration of iodomethane is increased in the reaction mixture, it will lead to an increase in the reaction rate. This increase occurs due to the collision theory and the effect of concentration on the reaction kinetics.
According to the collision theory, for a reaction to occur, the reactant molecules must collide with sufficient energy and proper orientation. By increasing the concentration of iodomethane, there are more iodomethane molecules available in the reaction mixture. Consequently, there will be an increased frequency of collisions between the nucleophile (tert-butoxide ion) and the electrophile (iodomethane), increasing the likelihood of successful collisions leading to a reaction.
Additionally, the rate of an SN₂ reaction is dependent on the concentration of both the nucleophile and the electrophile. In this case, as the concentration of iodomethane increases, the concentration of the electrophile increases. This increase in electrophile concentration will result in a higher reaction rate, as more electrophiles are available for reaction with the nucleophile.
Therefore, increasing the concentration of iodomethane or 1-chlorobutane in the reaction mixture will increase the reaction rate due to an increased frequency of collisions and an increased concentration of electrophiles.
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How many molecules are contained in 125 grams of oxygen
gas (O2)?
Answer:
i think its 62.50 :) hope this helped you out
Identify each of the following half-reactions as either an oxidation half-reaction or a reduction half-reaction.
half-reaction
identification
Br2(1)+2e- →→2Br (aq)
Zn(s) Zn2+(aq) + 2e
The half-reaction Br[tex]_2[/tex](l) + 2[tex]e^-[/tex] → 2[tex]Br^-[/tex](aq) is a reduction half-reaction, while the half-reaction Zn(s) → [tex]Zn^{2+}[/tex](aq) + 2[tex]e^-[/tex] is an oxidation half-reaction.
The given half-reactions are:
Br[tex]_2[/tex](l) + 2[tex]e^-[/tex] → 2[tex]Br^-[/tex](aq)
Zn(s) → [tex]Zn^{2+}[/tex](aq) + 2[tex]e^-[/tex]
The oxidation and reduction reactions are defined as follows:
Oxidation reaction: A half-reaction that includes the loss of electrons is referred to as an oxidation reaction. The oxidation number of the species involved in the reaction is increased in this process.
Reduction reaction: A half-reaction that involves gaining electrons is referred to as a reduction reaction. The oxidation number of the species involved in the reaction is decreased in this process.
Now let us identify which half-reaction is oxidation and which is reduction:
Br[tex]_2[/tex](l) + 2[tex]e^-[/tex] → 2[tex]Br^-[/tex](aq) (reduction reaction)
Zn(s) → [tex]Zn^{2+}[/tex](aq) + 2[tex]e^-[/tex](oxidation reaction)
Thus, the half-reaction Br[tex]_2[/tex](l) + 2[tex]e^-[/tex] → 2[tex]Br^-[/tex](aq) is an example of a reduction half-reaction, while the half-reaction Zn(s) → [tex]Zn^{2+}[/tex](aq) + 2[tex]e^-[/tex] is an example of an oxidation half-reaction.
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help me........................ please?
Answer:
2 NO2 -> 2 O2 + N2
is a decomposition reaction
What is the hybridization of bromine in each of thefollowing:
a)BrF3
b)BrO2-
c)BrF5
The bromine atom in BrF3 is sp3d hybridized, in BrO2- it is sp3 hybridized, and in BrF5 it is sp3d2 hybridized.
The hybridization of bromine in each of the following compounds is as follows:
a) BrF3:
The central atom, bromine (Br), in BrF3 undergoes sp3d hybridization. It forms three sigma bonds with three fluorine atoms and has two lone pairs of electrons. The three sigma bonds are formed by overlapping of the sp3d hybrid orbitals of bromine with the 2p orbitals of the fluorine atoms.
b) BrO2-:
The central atom, bromine (Br), in BrO2- undergoes sp3 hybridization. It forms two sigma bonds with two oxygen atoms and has two lone pairs of electrons. The two sigma bonds are formed by overlapping of the sp3 hybrid orbitals of bromine with the 2p orbitals of the oxygen atoms.
c) BrF5:
The central atom, bromine (Br), in BrF5 undergoes sp3d2 hybridization. It forms five sigma bonds with five fluorine atoms and has one lone pair of electrons. The five sigma bonds are formed by overlapping of the sp3d2 hybrid orbitals of bromine with the 2p orbitals of the fluorine atoms.
Hybridization is a concept used to describe the mixing of atomic orbitals to form new hybrid orbitals in a molecule. It helps to explain the molecular geometry and bonding in the molecule. The hybridization of an atom depends on the number of sigma bonds it forms and the number of lone pairs of electrons it possesses.
In summary, the bromine atom in BrF3 is sp3d hybridized, in BrO2- it is sp3 hybridized, and in BrF5 it is sp3d2 hybridized. The hybridization of bromine determines the shape and geometry of the molecules and provides insights into the nature of their chemical bonding.
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Silver has two stable isotopes. The nucleus, 10747Ag, has atomic mass 106.905095 g/mol with an abundance of 51.83% ; whereas 10947Ag, has atomic mass 108.904754 g/ mol with an abundance of 48.17%. What is the binding energy per nucleon for each isotope?
To calculate the binding energy per nucleon for each isotope of silver, we need to determine the total binding energy of each isotope and divide it by the number of nucleons (protons and neutrons) in each isotope.
The binding energy per nucleon represents the average energy required to remove a nucleon from the nucleus. It is a measure of the stability of the nucleus. To calculate the binding energy per nucleon, we need to determine the total binding energy and the number of nucleons for each isotope. First, we calculate the total binding energy for each isotope using the mass-energy equivalence equation E = mc², where E is the energy, m is the mass, and c is the speed of light.
For the first isotope, 10747Ag, with an atomic mass of 106.905095 g/mol, we multiply the atomic mass by the Avogadro's number to obtain the mass of one mole of atoms. Then we divide the mass by the number of atoms in one mole to get the mass of one atom. The difference between the mass of one atom and the mass of the individual nucleons (protons and neutrons) gives the mass defect. Multiplying the mass defect by c² gives the binding energy of one atom. Finally, dividing the binding energy by the number of nucleons in the isotope gives the binding energy per nucleon.
We repeat the same calculations for the second isotope, 10947Ag, with an atomic mass of 108.904754 g/mol. The resulting values represent the binding energy per nucleon for each isotope of silver.
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Which statement about elements is true?
All substances are made up of elements.
There are approximately 50 elements.
An element is made up of different types of atoms.
Most elements are nonmetal.

Answer:
first one is right.
there are 117 elements, so 2nd option is wrong.
elements are made up of one type of atoms, so 3rd is also wrong.
most elements are metal. so 3rd is wrong
Step 1: Consider 0.10 M solutions of acetic acid, ammonia, hydrochloric acid, and sodium hydroxide. Rank these solutions in order of increasing pH (starting from the lowest, and ending with the highest pH value). Please also make a statement, whether each solution is an acidic or a basic one, and provide an explanation why.
Step 2: How many carbon atoms are there in a molecule of each of the following:
a. ethane b. 1-butyne c. propene d. cyclooctane
Please provide molecular formula for each of the four above mentioned compounds.
Example: 2-pentene - contains 5 atoms of C, molecular formula is C5H10
The order of the increasing pH of the solution is Hydrochloric acid, Acetic acid, Ammonia, and Sodium hydroxide.
Molecular formula of compounds: Ethane: C2H6, 1-Butyne: C4H6, Propene: C3H6 and Cyclooctane: C8H16
Rank of solutions in order of increasing pH:
Hydrochloric acid (HCl) is a strong acid that dissociates completely in water. Its pH is very low (less than 1) and it is strongly acidic. It is an acidic solution. It's a 1.0 M solution of hydrochloric acid.
Ammonia (NH3) is a weak base that does not completely dissociate in water. It is a weak base with a pH greater than 7 but less than 10. It is a basic solution. It's a 1.0 M solution of ammonia.
Acetic acid (CH3COOH) is a weak acid that does not completely dissociate in water. It has a pH of around 3.5-4.0, making it a weakly acidic solution. It is an acidic solution. It's a 1.0 M solution of acetic acid.
Sodium hydroxide (NaOH) is a strong base that dissociates completely in water. It has a very high pH (greater than 14), making it a strongly basic solution. It is a basic solution. It's a 1.0 M solution of sodium hydroxide.
So, from the above explanation, the order of the increasing pH of the solution is
Hydrochloric acid, Acetic acid, Ammonia, and Sodium hydroxide.
Step 2: Molecular formula of compounds:
Ethane: C2H6, contains 2 carbon atoms
1-Butyne: C4H6, contains 4 carbon atoms
Propene: C3H6, contains 3 carbon atoms
Cyclooctane: C8H16, contains 8 carbon atoms
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C-14 is an isotope of the element carbon. How does it differ from the carbon atom seen here?
A) C-14 has two more protons.
B) C-14 has two more neutrons.
C) C-14 has a larger atomic radius.
D) C-14 has two additional valence electrons.
This column of the periodic table represents the halogen family. This is a family of reactive elements. How do the members of the family differ? How are they alike?
A) The mass numbers differ; they have the same number of protons and valence electrons.
B) They have different atomic numbers and mass numbers; they have the same number of electrons.
C) They have different atomic numbers and mass numbers; they have the same number of valence electrons.
D) They have different numbers of protons, neutrons, and valence electrons; they are all gases at room temperature.
Young stars, just beginning their life in the galaxy, would contain mostly
A) carbon.
B) helium.
C) iron and nickel.
D) hydrogen and helium
C-14 is an isotope of the element carbon and it differs from the carbon atom in the fact that it has two more neutrons. The correct option is B) C-14 has two more neutrons.An isotope is referred to as the element of the same atomic number, and isotopes possess a different number of neutrons in their nucleus.
The correct option is B
For example, the carbon-14 isotope of carbon has 6 protons and 8 neutrons, whereas the carbon-12 isotope of carbon has 6 protons and 6 neutrons .This column of the periodic table represents the halogen family. This is a family of reactive elements. Members of the halogen family differ in that they have different atomic numbers and mass numbers; they have the same number of valence electrons. Hence, the correct option is C) They have different atomic numbers and mass numbers; they have the same number of valence electrons.
The halogens are a family of highly reactive non-metallic elements from Group 17 (the seventh column) of the periodic table. The halogens are fluorine (F), chlorine (Cl), bromine (Br), iodine (I), and astatine (At).Young stars, just beginning their life in the galaxy, would contain mostly hydrogen and helium. Hence, the correct option is D) hydrogen and helium. During the star formation process, these two gases are pulled together by gravity to create nuclear fusion reactions. As a result of this reaction, the hydrogen is converted into helium.
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The structural layers of the sun are shown in the cross-sectional diagram. An image of six concentric circles is shown. The six layers thus formed are of varying thickness. The layers in order from inside out are labeled, A, B, C, D, E, F. Which layer represents the radiative zone? A B C D (21 points plus brainliest!)
A layer represents the radiative zone which is at the centre of the cross-sectional diagram.
What is a radio active zone?The layer of a star that lies just outside the core, to which radiant energy is transferred from the core in the form of photons.
In the Sun, the region between the solar core at 0.2 of the Sun's radius and the outer convection zone at 0.71 of the Sun's radius is referred to as the radiation zone, although the core is also a radiative region.
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B
A is inner core B is outer core and there is a few other layers but from what I know looking at this the second layer has always been the radioactive zone.
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How many grams of carbon dioxide (CO2) are produced from 85.0 grams of carbon (C)?
Answer: If one mole of carbon monoxide has a mass of 28.01 g and one mole of carbon dioxide has a mass of 44.01 g , it follows that the reaction produces 44.01 g of carbon dioxide for every 28.01 g of carbon monoxide.
Explanation: (May Be Unrelated?)
How does this equation show that transmutation has taken place? 238 U – 334 Th + He 92 O A. The numbers of neither nucleons nor atoms are conserved. B. One element changes into another. O C. Atoms of different elements are present. O D. The number of nucleons is not conserved.
Answer:
B. One element changes into another.
Explanation:
We can see from the equation that uranium is changed to thorium and helium. Transmutation is the process by which one element is changed to another through radioactive decay, nuclear bombardment, or other similar processes.
Answer:b
Explanation:
From which celestial body is a star born?
A. supernova
B. nebula
C. protostar
D. black dwarf
Answer: B. nebula
Explanation:
Answer:
B. nebula
Explanation:
Birth takes place inside hydrogen-based dust clouds called nebulae.
-TheUnknownScientist
what hazard is most common from exposure to non-ionizing radiation?
The most common hazard from exposure to non-ionizing radiation is tissue heating.
What are the hazard common to exposure to non-ionizing radiation?The primary risk associated with exposure to non-ionizing radiation lies in the potential for tissue heating. Non-ionizing radiation lacks the necessary energy to dislodge electrons from atoms or molecules, yet it can still transfer energy to matter by inducing molecular vibration.
This vibration, in turn, can elevate the temperature of the exposed tissue, consequently giving rise to a spectrum of health concerns, including:
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A common characteristic of killers who choose poison as their weapon. This way they can avoid having to confront their victim me directly.
Answer:
The killers who choose poison for killing the victim are the one who does not want to confront the victim. When a knife or a bullet is used to kill a person he may struggle and can cause harm to killer also.
Explanation:
Poison is the most easiest way to kill a person without any struggle. The poison can be given to a person in a juice or through an injection. The poison entered in the body of victim will cause his heart to cease gradually and he will not have energy to struggle with the killer to save his life.
1. Which graph represents the endothermic reaction?
2. Which graph represents the exothermic reaction?