Answer: there is nothing to see
Explanation: there is nothing currently nothing to see so nobody can solve it
a 25.00 ml volume of hbr solution is titrated with 0.250 m koh. the initial volume of koh in the buret is 1.25 ml and the final volume is 28.35 ml. determine the concentration of the hbr solution. a. 0.221 m hbr b. 0.250 m hbr c. 0.271 m hbr d. 0.345 m hbr e. 4.33 m hbr
Titration of a 25.00 ml amount of hbr solution with 0.250 m koh is performed. The buret holds 1.25 ml of koh at the beginning, and 28.35 ml at the end. The hbr solution has a concentration of 0.345 m hbr.
An unknown acid/base analyte solution's molar concentration (or "molarity") has to be ascertained using an acid-base titration. An accurate base/acid titrant addition from a burette is used to achieve this. Strong base KOH reacts with strong acid HBr in a 1:1 molar ratio in this acid-base titration reaction: KOH+HBrH2O+KBr
The analyte will finally be completely consumed if the titrant is kept adding. Beyond that, every additional addition will result in an excess of titrant.
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How do aluminium displace the iron in redox reaction as it has it protective layer of aluminium oxide
Aluminum displaces the iron in a redox reaction as it has its protective layer of aluminum oxide because it is more reactive than iron.
What is a redox reaction?A redox reaction is a reaction in which oxidation and reduction reaction occur simultaneously and to the same extent.
An oxidation reaction occurs when atoms of elements lose electrons resulting in an increase in the oxidation number of the element.
A\ occurs when atoms of elements gain electrons resulting in a decrease in the oxidation number of the element.
The redox reaction of the displacement of iron by aluminum to form a protective layer of aluminum oxide is given below:
Fe₂O₃ (aq) + 2 Al (s) ----> 2 Fe (s) + Al₂O₃
In the given redox reaction above, aluminum metal displaces iron from its oxide to form aluminum oxide. Iron (iii) ion is reduced to metallic iron while metallic aluminum is oxidized to aluminum (iii) ion.
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Complete the given reaction which is part of the electron transport chain. the abbreviation q represents coenzyme q. FADH2+ Q → ________
Part of the electron transport chain. the abbreviation q represents coenzyme q. FADH2 + Q → QH2+ FAD
here the reactant Coenzyme Q is reduced and FADH2 is oxidized .
reduced Coenzyme Q is oxidized by the Complex III, and cytochromosome c is reduced so the Fe3+ is reduced to Fe2+, the oxidation state of the iron in the right side is +2
so the answer is x=+2
A coenzyme is defined as an organic molecule that binds to the active site of a specific enzyme and helps catalyze a reaction. In particular, coenzymes can act as electron carriers in these reactions or transfer between enzymes as functional groups.
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which of the following most accurately describes el nino
a. a weather phenomenon caused by flooding in the americas and droughts in western tropical pacific areas
b. a weather phenomoenon that results from changes in air pressure and water temperature over and in the pacific ocean
c. a severe hurricane with intense winds and significant waves
d. warm waters in the atlantic ocean that flow westward in heavy wind
Changing air pressure and sea temperatures over and in the Pacific Ocean are what cause El Nino, a weather phenomenon, to occur.
Describe El Nino.El Nio is a tropical Pacific ocean-atmosphere oscillation that has a big impact on the weather all around the world. Principal Origins of El Nio Under typical circumstances, the wind blows in the Pacific from east to west around the equator.
What peculiar pattern appears when El Nio occurs?The Quick Response: The Pacific Ocean experiences El Nio as a weather pattern. Hot surface water from of the equator is moving eastward towards Central and South America at this time due to anomalous winds.
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gold decomposing into powder exothermic or endothermic?
Answer:
endothermic
Explanation:Yes all decomposition reactions are endothermic. Decomposition reactions involve breaking of bonds which require energy. Due to this decomposition reactions are generally endothermic in nature.
Which isomer reacts more rapidly in an e2 reaction, cis-1-bromo-4-tert-butylcyclohexane or trans-1-bromo-4-tert-butylcyclohexane?
The compound that would undergo faster elimination reaction is cis-1-bromo-4-tert-butylcyclohexane.
The two primary requirements for an E-2 elimination reaction are as follows:
There must be availability of β-hydrogens which means the presence of hydrogen on the carbon next to the leaving group.The hydrogen and leaving group must be in a anti-periplanar position.Any substrate which follows the above two conditions are capable of giving elimination reactions.
Among the structures trans-1-bromo-4-tert-butylcyclohexane and cis-1-bromo-4-tert-butylcyclohexane, to be stable it must have the tert-butyl group in the equatorial position as it is a bulky group and at equatorial position it would not repel other groups. If the structure is kept on the axial position it would undergo 1,3-diaxial interaction and would destabilize the system and that structure would be unstable hence will not show E-2 elimination.
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when the reaction was completed, why was the reaction mixture poured onto ice? choose all that apply.
In order to crush out the organic product, add cold water primarily the reaction was completed, and the reaction mixture was poured onto ice.
With aspirin, you've acetylated the substance. Therefore, you converted an OH into an acetate group. This implies that your product ought to be less water-soluble. You most likely used an acid catalyst and acetic anhydride for this reaction. Consequently, the water makes your product precipitate.
-hydrolyzes the extra acetic anhydride to produce acetic acid.
-enables you to collect your product by vacuum filtration, making it convenient to eliminate the reaction byproducts (acetic acid and the inorganic acid you employed as catalyst).
Because aspirin is still just a little bit soluble in water, you chill the mixture. By lowering the solvent's temperature, you can make the product less soluble.
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1. how many atoms does each element have: remember: if there is no little number (subscript) after the symbol, it has a 1 value. he nacl n2o c6h12o6 ar h2o ccl4 caco3 h2 co2 cabr2 naoh o2 nh3 c2h4 mgcl2
A chemical element is uniquely defined by its atoms, which are smaller pieces of matter. An atom is made up of a core nucleus and one or more negatively charged electrons orbiting around it.
There may be positively charged, relatively abundant protons and neutrons that make up the nucleus. Each of the elements listed below has atoms that have
Nacl has 2 atoms one sodium and 1 chloride atom
N2O has 3 atoms containing 2 nitrogen and 1 oxygen
C6H12O6 has 24 atoms , H20 has 3 atoms, CCl4 has 5 atoms, CaCO3 has 4 atoms, H2 has 2 atoms, CO2 has 3 atoms, CaBr2 has 3 atoms, NaOh has 2 atoms, O2 has 2 atoms , NH3 has 4 atoms, C2H4 has atoms and MgCl2 has 3 atoms.
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A 3. 5kg object i accelerating at 2. 2m/ while being puhed by a force of 10 n to the right acro the floor
The force of friction acting against the object is 2.3 N.
The problem isn't complete. A similar problem is in the attachment. According to Newton's second law, the acceleration of the object depends on the force that acts on the object
∑F = ma
m = the mass of the object = 3.5 kga = the acceleration = 2.2 m/s²F = the force = 10 Na = F ÷ m = 10 ÷ 3.5 = 2.86 m/s²
The acceleration is different from the info, so there is another force acting on the object. The friction force works in the object if it's on a rough surface. The direction of the friction force is always against the movement of the object.
∑F = ma
F - f = ma
10 - f = 3.5 × 2.2
10 - f = 7.7
f = 10 - 7.7
f = 2.3 N
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a solute is dissolved in a liquid. how does the osmotic pressure of the solution compare to the osmotic pressure of the pure liquid?
the osmotic pressure of solution is greater than the pure solvent.
As more solute dissolves in the solvent, the concentration of the solution continues to increase. As the concentration of the solution increases, the osmotic pressure of the solution increases. Therefore, the osmotic pressure of the solution is greater than that of the pure solvent. Since the concentration of solutes in
solution is higher than that of pure water, water from pure water tends to diffuse or penetrate into the solution. Therefore, the pressure required to prevent water from entering the solution, the osmotic pressure of the H. solution, is always higher than that of pure water or solvent.
The osmotic pressure of a liquid is determined by the number of solute particles present in the solution. Osmotic pressure is directly proportional to dissolved particles in a liquid. H. The higher the osmotic pressure, the higher the number of dissolved particles.
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a moves needed substances or waste materials through the plasma membrane and contributes to the selective permeability of the plasma membrane.
The selective permeability is influenced by proteins that assist transfer materials or trash across the plasma membrane by forming tunnels in the membrane.
A membrane in a person is what?Body membranes are incredibly thin tissue sheets that coat the bodily, line body cavities, and protect organs inside hollow organs. They fall within the epithelium and connective tissue membrane categories.
What are some uses for membrane?A cell is shielded by its plasma membrane, often known as its cell membrane. The membrane serves a variety of purposes and also creates a stable environment inside the cell. It means transporting both toxic materials out of another cell and nourishment into it.
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which of the following liquids will have the highest vapor pressure? a. dimethylamine, (ch3)2nh d. 1-propanol, ch3ch2ch2oh b. dimethylsulfide, (ch3)2s e. ethylene glycol, hoch2ch2oh c. water, h2o
The liquids which will have the highest vapor pressure among the option is water(H20).
The pressure of the vapour produced by the evaporation of a fluid (or solid) over a sample of the fluid (or solid) in such a closed container is known as the vapour pressure of a liquid, also known as the equilibrium pressure of a vapour above its liquid (or solid). The force that is created as liquids evaporate is known as vapour pressure. Surface area, intermolecular forces, and temperature are three variables that frequently have an impact on a vapour press. As the temperature changes, so do the vapour pressures of molecules.
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determine the mass of naoh that is necessary to neutralize 1.25 l of 0.525 m h3po4. a. 26.3 g naoh b. 39.4 g naoh c. 78.8 g naoh d. 286 g naoh e. 312 g naoh
The mass of NAOH necessary to neutralize 1.25l of0.525m H3PO4 is 78.8g.
what is NAOH?
The inorganic compound NaOH is sodium hydroxide, sometimes referred to as lye and caustic soda. The sodium cations Na+ and the hydroxide anions OH make up this white solid ionic combination.
Proteins are broken down by sodium hydroxide, a very caustic base and alkali that can result in serious chemical burns and is extremely reactive with proteins at room temperature. Easily absorbing moisture and carbon dioxide from the air, it is extremely soluble in water. NaOH and nH2O are formed in a sequence.
Water solutions between 12.3 and 61.8 °C crystallize the monohydrate NaOH, H2O. This monohydrate is frequently the "sodium hydroxide" sold commercially; therefore, the anhydrous compound may not always be used when referencing it in published data.
Volume of H3PO4 =1.25l
Number of moles of H3PO4=0.525*1.25=0.66moles of H3PO4
NAOH is used to neutralize the solution.
H3PO4+3NAOH ⇒ NA3PO4+H2O
3 moles of NAOH react with one mole of H3PO3. So, the number of moles of NAOH is equal to 3 times of number of moles of H3PO4
Number of moles of NAOH= 0.66×3=1.98moles
Mass of an object= number of moles ×molar mass
=1.98×40
= 78.8g
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What is the measure of radioactive decay rate?
alpha emission
beta emission
gamma emission
half life
Half life, as stated, is a measurement of the rate at which radioactive material decays.
What is radioactive, and what kinds are there?This process can be artificially produced by people, such as within a nuclear reactor, but can also occur spontaneously in nature. Depending on the particles or energy generated during the reaction, there are many kinds of radioactivity. Alpha particles, beta particles, and gamma rays are the three categories.
Briefing:Average and half-life are two characteristics that may be used to describe the decay constant. Moments are used as the measuring unit in both scenarios. The average lifespan of such an element, as indicated by its name, may be expressed in the form of the following affirmation:
Nt=N₀ * e^(−λt).
The duration of time that is defined by how long it takes for half of a material to degrade is known as its half-life (both radioactive and non-radioactive elements). All through process of decay, its rate of decay is constant. It may be seen by:
Nt=N₀* (1/2)^(t/t₁₂).
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Counting Atoms – How many atoms are in the following compounds? a) CaCl2_______ b) NH4OH_______ c) NaCl_______ Ca = ___, Cl = ____ N = __, H = __, O = __ Na = ___ Cl = __ d) N2O7_______ e) P2O5_______ f) C6H12O6_______ N = ___ O = ____ P = ____ O = ___ C = ____, H = ____, O = ____
To see the number of atoms of an element in a given molecule we need to multiply stoichiometry to the number that is written on the foot of the element that is stoichiometry.
What is atom?Atom is the smallest particle of any element, molecule or compound. Atom can not be further divided. Atoms contains nucleus in its center and electron that revolve around the atom in fixed orbit.
In the nucleus, proton and neutron are present. Electron has -1 charge while proton has +1 charge. Neutron is neutral that is it has no charge. So overall the charge of nucleus is due to only proton, not by neutron.
In CaCl[tex]_2[/tex],
Ca atom number = 1
Cl atom number=2.
In NH[tex]_4[/tex]OH,
N atom number= 1
H atom number= 5
O atom number = 1
In NaCl,
Na atom number=1
Cl atom number =1
In N[tex]_2[/tex]O[tex]_7[/tex]
N atom number= 2
O atom number =7
In P[tex]_2[/tex]O[tex]_5[/tex]
P atom = 2
O atom number = 5.
In compound C[tex]_6[/tex]H[tex]_{12}[/tex]O[tex]_6[/tex]
C atom number =6
H atom number =2
O atom number =6.
Therefore, the number of atoms of each element can be calculated as above.
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according to the belt of stability radionuclides having high neutron-to-proton ratios will likely decay in what manner?
One type of decay known as "beta-particle generation" results in the creation of an electron-beta particle. For nuclides with neutron/proton ratios that are too high—those that are above the zone of stability—this is a fairly frequent occurrence.
What is neutron?
Every atom's nucleus, with the exception of basic hydrogen, contains a neutron, a subatomic particle. The name of the particle comes from the fact that it is electrically neutral and devoid of charge. The density of neutrinos is really high.
With the exception of common hydrogen, every atomic nucleus contains a neutron, a neutral subatomic particle. It has no electric charge and a rest mass of 1.67492749804 1027 kg, which is slightly higher than the proton's but 1,838.68 times higher than the electron's.
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a gaseous mixture of o2 and n2 contains 35.8 % nitrogen by mass. what is the partial pressure of oxygen in the mixture if the total pressure is 705 mmhg ? express your answer numerically in millimeters of mercury.
The partial pressure of oxygen in the mixture if the total pressure is 705 mmHg is 427.935 mmHg
mO2 =100g - 35.8% = 64.2 g
We shall use the molar masses of both masses to convert them to moles.
N2 = 35.8*1mol/28.00=1.29mol
O2=64.2, *1 mol/32.00, or 2 mol.
O2's mole fraction is:
O2 = nO2 + nN2 + nO2 = 2/ 1.29 + 2 = 0.607
We can use the following expression to determine the partial pressure of oxygen given the total pressure (P) is 705 mmHg.
pO2= P* O2
= 705 * 0.607
=427.935
a gaseous mixture of oxygen and nitrogen with a mass percentage of 35.8% nitrogen and a total pressure of 705 mmHg.
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100 POINTS WILL MARK BRAINLIEST Which of these is a common use for a graduated cylinder?
A. Containing gaseous reactants for a reaction
B. Containing gaseous products of a reaction
C. Making specific (precise) measurements
D. Swirling the contents during a reaction to help mixing
Answer:
D!
Explanation:
Roundified as in a cylinder. A cylinder needs to be roundified and this is the most Roundified one, Their for this is the answer!
Hope you pass!
Answer:
D
Explanation:
Swirling the contents during a reaction to help mixing
The effective multiplication factor of a reactor is 0. 94. (a) what is the reactivity of the reactor? (b) what change in core reactivity would be required to make the reactor critical?
The effective multiplication factor k=0.94.
What is reactivity ?
Being responsive as a trait or state. Chemistry. the resemblance of an atom's, molecule's, or radical's ability to interact chemically with another atom, molecule, or substance.
What is reactor?
Reactor: A vessel or equipment used in chemical engineering to conduct chemical reactions for research or production.
(a) The effective multiplication factor k=0.94
The reactivity \rho = \frac{k-1}{k}=-0.0638.
(b) For the reactor to be critical, k = 1, which means the core reactivity should be increased to make it critical.
Therefore, the effective multiplication factor k=0.94.
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If the density of your unknown liquid is 0.65 g/ml, calculate the volume in liters that 3 ml of your unknown liquid would occupy when vaporized at the barometric pressure and temperature of your boiling water bath in run 1. use the accepted molar mass of your suspected unknown.
The 3 ml liquid should be sufficient for a relatively low molecular weight liquid. the molecular weight increases, the volume of liquid becomes smaller.
Say the molar mass of the unkown liquid is provided
then,
boiling point of water at 1 atm = 100 oC = 100 + 273 = 373 K
standard STP temperature = 273 K
STP volume = 22.4 L
Temperature = (373/273) = 1.37
density = 0.65 g/ml
Volume of 3 ml liquid when evaporated
= ((3 x 0.65)g/molar mass x 22.4 x 1.37
So knowing molar mass we can easily calculate the volume occupied by 3 x 0.65 g of liquid in vapor phase.
The 3 ml liquid should be sufficient for a relatively low molecular weight liquid. However as the molecular weight increases, the volume of liquid becomes smaller.
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draw the three alkenes, each of formula c5h10 , that will form 2‑methylbutane upon hydrogenation.
The three alkenes, each of formula C5H10, that will form 2-methylbutane upon hydrogenation will be 2-methyl-2-butene, 2-methyl-1-butene, and 3-methyl-1-butene.
Alkenes are acyclic (branched or unbranched) hydrocarbons having one carbon-to-carbon double bond. The addition of hydrogen to a carbon-carbon double bond is called hydrogenation. The general outcome of such an addition is the reductive reduction of the double-bond functional group. The easiest source of two hydrogen atoms is molecular hydrogen, but integrating alkenes with hydrogen does not result in any noticeable reaction.
Hydrogenation plays a a pivotal role in chemical synthesis. Although the widespread hydrogenation reaction is exothermic, a high activation energy precludes it from taking place under regular conditions.
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You can find the figure of three alkenes in the attached file.
What 3 types of products are excluded from labeling and SDS requirements?
How much does calcium chloride lower the freezing point of water?
Calcium chloride decreases the freezing point of moisture on the road to nearly 60 degrees below zero.
Calcium chloride is a very common chemical used to scatter on the roads for melting of ice is present on the driveways due to heavy snow.
When calcium chloride comes in contact with the ice it gets the associated into three ions one calcium ion and two chloride ions. Because of the presence of large number of ions.
The freezing point of the eyes decreases down to nearly 60 degrees below the normal freezing temperature of water which is 0 degree.
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Select the dominant intermolecular force between acetone molecules.a. hydrogen bondingb. London dispersion forcesc. ion-dipole forcesd. dipole-dipole forces
Dipolar molecules include acetone. Dipole-dipole interactions are therefore the main intermolecular forces acting on the acetone molecules.
Can acetone be consumed?Accidental intake of acetone-containing items can cause nausea, vomiting that may contain blood, and oral inflammation. Skin irritation, including dryness, redness, and inflammation, can result from persons getting acetone on their skin. Eye discomfort or injury can result from liquid or acetone vapour contact with the eyes.
Acetone—is it essentially alcohol?Although acetone and distilled alcohol both are chemical solvents used in different cleaning and degreasing processes as well as in the manufacturing of some similar products, they are two distinct chemical substances.
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The movement of water and electrolytes between fluid compartments is regulated primarily by
Controlling the flow of electrolytes between fluid compartments regulates the mobility of water. Osmosis is the process through which water moves between fluid compartments.
What controls the flow of fluid between compartments?A hydrostatic force, smooth Transitions between Compartments The force that a fluid applies against a wall—hydrostatic pressure—is what moves fluid between compartments. The pressure that blood applies to the blood vessel walls as a result of the heart's pumping motion is known as the hydrostatic pressure of blood.
What variables control the transport of electrolytes and water?Regulation of electrolytes and fluids. To avoid fluid volume excesses or deficits and maintain healthy blood pressure, the body must carefully control intravascular fluid buildup and excretion. Thirst, the Renin-Angiotensin-Aldosterone System (RAAS), and ADH are some of the systems that control water balance.
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PLEASE HELP ASAP:Two objects are placed a certain distance from each other. The amount of gravitational force between the two objects depends on their masses and the distance between them. As the masses of the objects decrease, the force of gravity between them _____________. As the distance between the objects decreases, the force of gravity between them ______________.
Answer: 1st blank= decreases 2nd blank= increases
Explanation:
The force of gravity depends directly upon the masses of the two objects, and inversely on the square of the distance between them. This means that the force of gravity increases with mass, but decreases with increasing distance between objects.
What happens in the transitional stage?
At the transitional stage, one form of matter is on the process of getting converted into another form of matter.
Matter is interconvertible in nature. Transition is defined as the change of matter from one phase to another. Transition occurs by the three phases viz. melting, freezing and evaporation.
At the transitional stage, matter is on the process of getting converted from its original form into another form by absorption or release of energy. Conversion of solid into liquid is known as melting; conversion of liquid into solid is known as freezing and conversion of liquid into gaseous state is known as evaporation.
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in the thermodynamics experiment, why was it necessary to filter the hot calcium hydroxide solution?
In a thermodynamics experiment, filtering the hot calcium hydroxide solution is necessary to removes any impurities or particulates that may be present in the solution that can affect the outcome of the experiment by introducing errors in the results.
In addition to this, filtering the hot calcium hydroxide solution also helps to ensure that the concentration of the solution remains consistent throughout the experiment. This is important because the concentration of the solution affects the thermodynamic properties of the solution, such as the temperature at which the reaction occurs. Without filtering, the concentration would vary depending on the amount of impurities present, and this could lead to inaccurate results.
Finally, filtering the hot calcium hydroxide solution also helps to prevent clogs or blockages in the equipment used for the experiment. If impurities are able to pass through the equipment, it could cause a disruption in the flow of the solution, which could affect the accuracy of the experiment.
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True or false? you can follow the progress of a reaction that produces a gas using a sensitive mass balance, because the mass of the reaction vessel increases as the gas is produced. False true.
“We can follow the progress of a reaction that produces a gas using a sensitive mass balance because the mass of the reaction vessel increases as the gas is produced.” This statement is: False.
What happens to the masses of compounds after a reaction occurs?According to the law of conservation of matter, energy and mass is neither created nor destroyed when a reaction occurs. Hence, the total mass of the products always equals the total mass of the reactants. Even if the product is in the gas state, the total mass of the product is always the same as the initial mass of the reactant. So, the statement above is false.
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The specific location where a substrate fits/connects to an enzyme is called the?
The term "active site" refers to the precise region where a substrate attaches or fits to an enzyme.
Enzymes help accelerate some chemical reactions in living organisms without altering the chemical reactions themselves. Every biological activity in living things is based on chemical reactions, and the bulk of these processes are controlled by enzymes. Many of these processes wouldn't occur at a perceptible rate without enzymes. Each stage of cellular metabolism is catalysed by enzymes. For instance, during food digestion, big nutrition molecules (such as proteins, carbs, and fats) are broken down; chemical energy is converted and stored; and cellular macromolecules are synthesised from smaller building blocks. Numerous genetic human diseases, such as albinism and phenylketonuria, are influenced by the absence of a specific enzyme.
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