Currently, the method utilised to identify a signal's position on an IR spectrum is called vibration excitation (increase vibration of the bonds or frequency).
The fingerprint area is the range of the infrared spectrum between 1200 and 700 cm-1. By measuring atom vibrations using IR spectroscopy, the functional groups of molecules can be identified.
What device might we employ to find IR?
A radiometer is a device used to find or quantify radiant energy. The phrase is specifically used in reference to instruments used to measure infrared radiation. There are several different types of radiometers, and each has a different measurement method.
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Explain why an object might be classified as having a negative electrostatic charge.
A negative charge indicates that an item contains more electrons than protons, that's why an object might be classified as having a negative electrostatic charge.
What is negative electrostatic charge?An item has an excess of electrons and is considered to have a negative charge when it obtains electrons. When an item loses electrons, it is considered to have a positive charge because it lacks electrons. Static electricity is the accumulation of electric charges.
Transferring electrons to or taking them away from an item produces an electrical charge. When electrons are introduced to an item, it acquires a negative charge due to the negative charge of electrons.
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100 POINTS HELPPP Which of these is a potential use for a beaker?
A. Obtaining reagents from the original bottle
B. Holding a liquid that evaporates fast at room temperature
C. Creating a specific concentration of a solution
D. Making specific (precise) measurements
Answer:
B. Holding a liquid that evaporates fast at room temperature
Explanation:
Beakers are useful as a reaction container or to hold liquid or solid samples. They are also used to catch liquids from titrations and filtrates from filtering operations. Laboratory Burners are sources of heat. Burets are for addition of a precise volume of liquid.
B. Holding a liquid that evaporates fast at room temperature
A sample of nitrogen gas is kept in a container of volume 2.3 L at a temperature of 32 degrees Celsius exerts a pressure of 4.7 atm. Calculate the number of moles of gas present.
The number of moles of gas present would be 0.43 mol.
Ideal gas equationThe ideal gas law is mathematically expressed as the ideal gas equation and is written as:
pv = nRT
Where p is the pressure, v is the volume, n is the number of moles, R is the gas constant, and T is the temperature of the gas in kelvin.
In this case, the pressure of the gas is given as 4.7 atm, the volume is given as 2.3 L, R is 0.082057 L.atm.K-1.mol-1, and the temperature is given as 32 degree Celsius.
32 degree Celsium = 32 + 273 = 305 kelvin
Making n the subject in the above equation:
n = pv/RT
= 4.7 x 2.3/0.082057x 305
= 10.81/25.027385
= 0.43 mol
In other words, the number of moles of gas present in a sample of nitrogen gas kept in a container of volume 2.3 L at a temperature of 32 degrees Celsius exerts a pressure of 4.7 atm is 0.43 mol.
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which of the following is a disadvantage of using a lithium ion (li-ion) battery over a nickel metal hydride (nimh) battery?
The price of lithium ion batteries is a significant drawback. They typically cost about 40% more to produce than nickel-cadmium cells.
What applications does lithium have?Rechargeable batteries for cell phones, computers, digital cameras, and electric vehicles are the most significant applications for lithium. Many non-rechargeable batteries for devices like heart pacemakers, toys, and clocks also include lithium.
Whose lithium deposits are the largest?With 8 million tons, Chile possesses the largest known lithium resources in the world. In comparison, Russia (1.2 million tons), Australasia (2.7 million tons), and Argentina (2 metric tons) are all ahead of the South American country (1 million tons). Compared to the rest of Europe, Portugal has fewer of the expensive raw materials.
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How many milliliters of 12.0 M HCl(aq) are needed to prepare 545.0 mL of 1.00 M HCl(aq)?
Please answer thank you !
Answer: 45.42 mL
Explanation: M1V1 = M2V2
3. for the reaction 2a b ---> c d (stoichiometric), the following mechanism is proposed: step 1: a b <---> e (forward rate constant
The rate law expression for the reaction is r = k [A] [B]. Answer B.
The full question is in the attachment. The reaction is bimolecular because it involves two elements as reactants. The two reaction steps present will form the other reaction
A + B → C + D (slow)
A + C → E + (fast)
2A + B → D + E
The rate law for every step
Step 1 : r₁ = k₁ [A] [B]Step 2 : r₂ = k₂ [A] [C]The rate law for the overall reaction depends on the slow step reaction, step number 1
r = k [A] [C]
where k is the rate constant.
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Draw the Lewis structures for the following particles. Which one can exhibit resonance? A. PCI3 B. NO₂¹ C. GeF D. CH₂
1. The lewis structure of the of phosphorus chloride, PCI₃, nitrogen dioxide, NO₂, germanium fluoride, GeF and methylene, CH₂ are all attached in the image accordingly.
2. The chemical species from above which exhibit resonance from the task above is NO₂
The correct answer choice is option b.
What is meant by lewis structure?Lewis structure can simply be defined as the process which involves the representation of valence electrons shell of an element or a molecule in an electron dot manner.
From the task given above, the lewis structure phosphorus chloride, nitrogen dioxide, germanium oxide and methylene have been correctly identified. All these are chemical compounds whose structure has been represented in an electron dot diagram.
In conclusion, we can now confirm and deduce from the explanation given above that the knowledge of lewis structure helps to understand molecules more.
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which of the following is not a factor that affects the percentage of light that is transmitted through a colored solution
Intensity of incoming light is the following is not a factor that affects the percentage of light that is transmitted through a colored solution.
What is intensity?
As well as being the same as the energy density times the wave speed, intensity is the amount of energy a wave transports over a surface of a given area in a unit of time.
What is light?
One kind of electromagnetic radiation is visible light, which travels through space in a way similar to a wave. Gamma rays, X-rays, ultraviolet light, infrared light, microwaves, and radio waves are further forms of electromagnetic radiation.
Therefore, Intensity of incoming light is the following is not a factor that affects the percentage of light that is transmitted through a colored solution.
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Which would you predict to have a higher boiling point and why?
Salt: NaCl
Sugar: C12H1801
Answer:
salt
Explanation: This is because salt (salt solution) contains more water than sugar. When it boils, the heat of the liquid water and vaporized salt combine to create a hot gas, which pressure forces out from the bottom of the container.
a sealed container holds 0.0135 mol CO2 gas what mass of Na2CO3 is needed to generate the CO2
The mass of Na₂CO₃ needed to generate 0.0135 mole of CO₂ is 1.431 grams
How do I determine the mass of Na₂CO₃ needed?We'll begin by obtaining the mole of Na₂CO₃ that reacted to produce 0.0135 mole of CO₂
Na₂CO₃ + 2HCl -> 2NaCl + H₂O + CO₂
From the balanced equation above,
1 mole of CO₂ was obtained from 1 mole of Na₂CO₃
Therefore,
0.0135 mole of CO₂ will also be obtained from 0.0135 mole of Na₂CO₃
Now, we shall determine the mass of Na₂CO₃ needed for the reation. Details below:
Mole of Na₂CO₃ = 0.0135 moleMolar mass of Na₂CO₃ = 106 g/molMass of Na₂CO₃ = ?Mole = mass / molar mass
0.0135 = Mass of Na₂CO₃ / 106
Cross multiply
Mass of Na₂CO₃ = 0.0135 × 106
Mass of Na₂CO₃ = 1.431 grams
Therefore, the mass of Na₂CO₃ needed is 1.431 grams
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calculate the molar internal energy of carbon dioxide at 298.15k , taking it's translational and rotational degrees of freedom into consideration
Answer:
Explanation:
To calculate the molar internal energy of a gas at a given temperature, you need to know the molar specific heat capacities at constant volume and constant pressure for the gas. These values are typically provided in tables of thermodynamic data, which can be found in various sources such as textbooks or online. Since you mentioned that you want to take the translational and rotational degrees of freedom into consideration, you will need to use the molar specific heat capacity at constant volume, which accounts for these degrees of freedom.
Once you have the molar specific heat capacity at constant volume for the gas, you can use the equation U = Cv * T, where U is the molar internal energy, Cv is the molar specific heat capacity at constant volume, and T is the temperature in kelvins. In your case, the temperature is 298.15 K, so plugging in the appropriate values and solving for U will give you the molar internal energy of carbon dioxide at that temperature.
It's important to note that the molar specific heat capacity at constant volume is typically a function of temperature, so you will need to use the appropriate value for the temperature you are interested in. Additionally, different sources may provide slightly different values for the molar specific heat capacity, so it's always a good idea to consult multiple sources to get a sense of the range of possible values.
What are the final products (or "outputs") of the Citric Acid Cycle? Select all that apply.
A. Pyruvate
B. Acetyl CoA
C. Citrate
D. NADH
E. CO2
F. ATP
G. FADH2
The final products (or "outputs") of the metabolic Citric Acid Cycle include NADH and FADH2 (Options D and G are correct).
What is the metabolic Citric Acid Cycle pathway?The metabolic Citric Acid Cycle pathway refers to a step during cellular respiration after glycolysis which has as its main objective the generation of NADH and FADH₂ which serves to transport electrons that will be used during oxidative phosphorylation.
Therefore, with this data, we can see that the metabolic Citric Acid Cycle pathway generates NADH and FADH₂ which are transport electron carriers to generate ATP.
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What process is being shown in this diagram?
precipitation
metathesis
dissolution
combustion
Answer:
dissociation
correct answer mark brainliest
Mg+I2=MgI2 Write balanced half-reactions describing the oxidation and reduction that happen in this reaction.
These are the oxidation and reduction reactions.
What is oxidation?
The process of oxidation occurs when a reactant loses electrons during a reaction. Reduction is the name for the process wherein a reactant picks up electrons while undergoing a reaction. This is a typical event when metals and acids interact. The process of oxidation occurs when a reactant loses electrons during a reaction.
What is reduction?
The process of obtaining electrons or lowering an element's oxidation state in a chemical reaction is known as reduction , which is the transfer of electrons between species. The number of electrons attached to a single atom or a collection of related atoms increases during a chemical reaction known as reduction.
Mg+I2=MgI2
MgI2
Mg is in +2 oxidation state
I2 is in -1 oxidation state
oxidation Mg ⇒ Mg ²⁺ + 2e⁻
Reduction I₂ + 2e⁻ ⇒ 2I⁻
Therefore, these are the oxidation and reduction reactions.
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Nitrous oxide can be formed by the thermal decomposition of ammonium nitrate:
NH4NO3(s) ---------> N2O(g) + 2H2O(g)
What mass of ammonium nitrate is required to produce 145 L of N2O at 2850 torr and 42 C?
The mass of the ammonium nitrate required is equal to 1684 grams.
What is the ideal gas equation?The ideal gas law can be specified as an equation of the state of an ideal gas. This equation is the product of the volume (V) and the pressure (P) is equal to the product of the moles (n), universal gas constant (R), and absolute temperature (T).
The ideal gas equation can be represented as mentioned below:
PV = nRT
Given, the volume of nitrous oxide, V = 145 L
The temperature of nitrous oxide gas, T = 42° C = 42 + 273 = 315 K
The value of the gas constant, R=0.082 atmL/K mol
The pressure of the gas, P = 2850 torr = 3.75 atm
The number of moles of nitrous oxide gas, n = PV/RT
n = 3.75 ×145/(0.082 × 315)
n = 21 mol
The balanced chemical equation:
[tex]NH_4NO_3(s) \longrightarrow N_2O(g) + 2H_2O(g)[/tex]
Therefore, the moles of ammonium nitrate will react = 21 mol
The mass of ammonium nitrate = 21 × 80 = 1684 g
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4. Calculate the new molarity if 130.0 mL of water is added to 55.0 mL of a 5.82 M solution of
LIOH.
The new molarity is 1.73 M
What is the molarity?The new molarity if 130.0 mL of water is added to 55.0 mL of a 5.82 M solution of LIOH.
The formula for determining molarity from moles and volume is extremely straightforward. Simply divide the volume of solution by the moles of solute.The number of moles per liter, denoted by the unit sign mol/L or mol/dm3 in SI units, is the most widely used unit for measuring molarity. One mol/L of a solution's concentration is referred to as one molar, or 1 M.MO = 2.00 M
MD=
MOVO = MDVD
VO = 55 mL, and
VD = 185 mL (55 + 130 mL).
M x 55 mL = 5.82 MD x 185 mL
MD = 5.82*55/185 = 1.73 M
The new molarity is 1.73 M.
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the atomic masses of nitrogen-14, titanium-48, and xenon-129 are 13.999234 amuamu , 47.935878 amuamu , and 128.904779 amuamu , respectively. part a calculate the nuclear masses of all three isotopes.
a). the nuclear masses of nitrogen-14 is 14.11154 amu
b). the nuclear masses of titanium-48 is 48.38523 amu
c). the nuclear masses of xenon-129 is 130.042455 amu
Define nuclear mass.
The formula for calculating nuclear mass is M=ZM (p)+(A-Z)M (n), where M (p) and M (n) refer to the mass of protons and neutrons, respectively. Nuclear mass is the total mass of all the nucleons represented inside the nucleus.
a). Given, atomic mass of 7N14= 13.999234 amu
We, know
Mass of proton= 1.00727 amu
Mass of neutron= 1.008665 amu
A nucleus contains only neutron and proton. N14 nucleus contains 7 protons and 7 neutrons that is 14 nucleons.
Therefore, the total mass of protons and neutrons= nuclear mass
= (7*1.00727 amu) + (7*1.008665 amu)= 14.11154 amu
b). Given, atomic mass of 22Ti48= 47.935878 amu
We, know
Mass of proton= 1.00727 amu
Mass of neutron= 1.008665 amu
A nucleus contains only neutron and proton. N48 nucleus contains 22 protons and (48-22) =26 neutrons that is 48 nucleons.
Therefore, the total mass of protons and neutrons= nuclear mass
= (22*1.00727 amu) + (26*1.008665 amu)= 48.38523 amu
c). Given, atomic mass of 54Xe129= 128.904779 amu
We, know
Mass of proton= 1.00727 amu
Mass of neutron= 1.008665 amu
A nucleus contains only neutron and proton. N48 nucleus contains 54 protons and (129-54) =75 neutrons that is 129 nucleons.
Therefore, the total mass of protons and neutrons= nuclear mass
= (54*1.00727 amu) + (75*1.008665 amu)= 130.042455 amu
Therefore, a). the nuclear masses of nitrogen-14 is 14.11154 amu
b). the nuclear masses of titanium-48 is 48.38523 amu
c). the nuclear masses of xenon-129 is 130.042455 amu.
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1. Describe an example of a physical change
or chemical change that is endothermic
and a physical or chemical change that is
exothermic.
GIVING BRAINLIEST
Answer:
Endothermic - Ice cubes absorbing the heat around them to melt into water.
Exothermic - Candle burning giving off heat into the atmosphere.
A large tire contains 9.5 L of gas at a pressure
of 3.3 atm and a temperature of 279 K.
If the temperature of the gas increases to 303 K
and the volume is increased to 11.9 L,
what will be the new pressure of the gas?
Answer:
new pressure = 2.86 atm
Explanation:
To solve the given problem, we have to use the 'combined gas law', which is expressed in the formula:
[tex]\boxed{\frac{p_1V_1}{T_1} = \frac{p_2V_2}{T_2}}[/tex].
From the question, we know that the initial volume of the gas is 9.5 L, the initial pressure is 3.3 atm, and the initial temperature is 279 K. Therefore, V₁ = 9.5, p₁ = 3.3, and T₁ = 279.
We are also told that the gas temperature increases to 303 K and the volume increases to 11.9 L. Therefore, T₂ = 303 and V₂ = 11.9. We are then asked to calculate the new pressure (p₂).
To do this, we have to substitute the known values into the equation and solve it for p₂:
[tex]{\frac{p_1V_1}{T_1} = \frac{p_2V_2}{T_2}}[/tex]
⇒ [tex]\frac{3.3 \times 9.5}{279} = \frac{p_2 \times 11.9}{303}[/tex]
⇒ [tex]303 \times \frac{3.3 \times 9.5}{279} = p_2 \times 11.9[/tex]
⇒ [tex]\frac{3.3 \times 9.5 \times 303 }{279 \times 11.9} = p_2[/tex]
⇒ [tex]p_2 = \bf 2.86 \ atm[/tex]
Therefore, the new pressure of the gas is 2.86 atm.
For a radical addition reaction involving HBr and propene, sort each reaction step into the following categories: CH3CH=CH2 + HBr CH3CH2CH2Br
Answer:
Explanation: Breaking double bond and adding HBr with a catalyst as hydrogen peroxide.
relationship between electron geometry, molecular geometry, orbital hybridization and molecular polarity
The relationship between electron geometry, molecular geometry, orbital hybridization, and molecular polarity is:
Hybridization affects molecular geometry because a molecule's geometry depends on the number of s and p orbitals of a molecule. The orbital hybridization also affects the positions of electron groups and the lone pairs, which affects the electron geometry and the molecular polarity as well.How do electron geometry, molecular geometry, orbital hybridization, and molecular polarity correlate?These 4 aspects have a significant role in the characteristic of a molecule:
Electron geometry, which is the arrangement of electron pairs around the central atom.Molecular geometry, which is the structure that represents the arrangement of atoms in a molecule.Orbital hybridization, which is the redistribution of energy of an atom into the orbitals.Molecular polarity, which is the distribution of the electron clouds across the atoms within a molecule.Orbital hybridization is the key to the other aspects. By determining an atom's s and p hybridization, we can analyze the molecular geometry. For example, an sp³ atom has tetrahedral geometry. Molecular geometry depends on the electron arrangement in atoms and molecules. The electron arrangement defines the electron clouds and affects the molecular polarity as well.
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the hydrides of group 5a are nh3 , ph3 , ash3 , and sbh3 . arrange them from highest to lowest boiling point. rank the molecules from highest to lowest boiling point. to rank items as equivalent, overlap them.
The decreasing order of the hydrides of Group 5A is as follows: SbHN₃ > NH₃ > AsH₃ > PH₃.
What is hydrides?
Any of a group of chemical compounds called hydrides in which hydrogen is joined to another element .
What is boiling point?
A liquid's boiling point is determined by the temperature at which its vapor pressure equals that of the gas above it. The temperature at which a liquid's vapor pressure equals one atmosphere is known as the normal boiling point of that liquid (760 torr).
Therefore, decreasing order of the hydrides of Group 5A is as follows: SbHN₃ > NH₃ > AsH₃ > PH₃.
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when looking at the carbon isotopes present in the atmosphere, scientists determined that 13c and 14c levels have decreased over time.
The use of fossil fuels is responsible for increased atmospheric CO2.
What is fossil fuel?
A fossil fuel is a hydrocarbon-containing material that forms naturally in the earth's crust from the remains of dead plants and animals, which is extracted and burned as fuel.The main fossil fuels are coal, oil and natural gas.Fossil fuels can be burned to provide heat for direct use (such as cooking or heating), to power engines (such as internal combustion engines in motor vehicles), or to generate electricity.Some fossil fuels are refined into derivatives such as kerosene, gasoline, and propane before being burned.The origin of fossil fuels is the anaerobic decomposition of buried dead organisms containing organic molecules produced by photosynthesis.Conversion from these materials to high-carbon fossil fuels typically requires a geological process lasting millions of years.To know more about fossil fuel, click the link given below:
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Ni+2Cl2=NiCl4
Then, write balanced half-reactions describing the oxidation and reduction that happen in this reaction.
The oxidation reaction: Ni → Ni⁴⁺ + 4e.
The reduction reaction: 2Cl₂ + 4e → 4Cl⁻.
What is Redox Reaction?
Redox or Oxidation-Reduction processes usually involve simultaneous oxidation and reduction reactions. In a chemical reaction, the material that is being reduced is referred to as the reducing agent, while the substance that is being oxidised is the oxidising agent.
The mentioned reaction: Ni + 2Cl₂ → NiCl₄.
It is an oxidation-reduction reaction comes from two half reactions.
The oxidation reaction: in it Ni losses 4 electrons and is oxidized to Ni⁴⁺ according to the reaction:
Ni → Ni⁴⁺ + 4e.
The reduction reaction: every molecule of Cl₂ will gain 2 electrons and is reduced to 2Cl⁻ according to the reaction:
2Cl₂ + 4e → 4Cl⁻.
The summation of the two-half reactions will give the reaction:
Ni + 2Cl₂ → NiCl₄.
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How many moles of hydrogen atoms are in 7.10 moles of water?
Answer:
3 atoms
Explanation:
there are 2 atoms of hydrogen and 1 atom of oxygen
A 14.01 g sample of N2 reacts with 5.02 g of H2 to form ammonia (NH3). If ammonia is the only product, what mass of ammonia is formed?
The mass of ammonia formed if it were to be the only product would be 17 grams.
Stoichiometric problemNitrogen gas reacts with hydrogen gas to form ammonia gas according to the following balanced equation:
[tex]N_2 + 3H_2 --- > 2NH_3[/tex]
From the balanced equation of the reaction, the mole ratio of nitrogen to hydrogen gas is 1:3.
Recall that, mole = mass/molar mass
Thus, 14.01 g of nitrogen gas would be:
14.01/28.02 = 0.5 mol
5.02 g of hydrogen gas would be:
5.02/1.01 = 5.0 mol
Since the mole ratio from the balanced equation is 1:3, 0.5 mol nitrogen should require 1.5 mol hydrogen. In other words, 5.0 mol hydrogen is excess while 0.5 mol nitrogen is the limiting reactant.
The mole ratio of nitrogen to the ammonia produced is 1:2. Thus, the equivalent mol of ammonia gas produced would be:
0.5 x 2 = 1 mol
Mass of 1 mol ammonia = 1 x 17
= 17 grams
Thus, the mass of ammonia gas that will be formed from 14.01 g sample of nitrogen gas and 5.02 sample of hydrogen gas would be 17 grams.
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52.6 g sample of granite initially at 125°C was added to a coffee cup Killorin mentor the calorimeter held 100 mL of water at 20°C what will be the final temperature in the calorimeter
The final temperature of the granite and the water in the calorimeter is 8.4°.
What is the final temperature?We know that in accordance to the first law of thermodynamics, energy is neither created nor destroyed but it can be converted from one form to another. This implies that the heat that is lost by the granite has to be equal to the heat that is gained by the water in this case.
Knowing that;
H = mcdT
H = heat lost or gained
c = specific heat capacity of the substance
dT = temperature change
Heat lost by the granite = Heat gained by water
52.6 * 0.79 * (θ - 125) = 100 * 4.18 * (θ - 20)
41.6θ - 5200 = 418θ - 8360
Collecting the like terms
41.6θ - 418θ = - 8360 + 5200
-376.4θ = -3160
θ = -3160/-376.4
θ = 8.4°
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Step 1:H2(g)+ICl(g)→HI(g)+HCl(g)(slow)Step 2:HI(g)+ICl(g)→HCl(g)+I2(g)(fast)The reaction is carried out at constant temperature inside a rigid container. Based on this mechanism, which of the following is the most likely reason for the different rates of step 1 and step 2 ?
H2(g)+2ICl(g) → 2HCl(g)+I2(g)H2(g)+2ICl(g)→2HCl(g)+I2(g)
rate=k[HI][ICl]
What is Rate of Reaction?
The pace at which the products are created from the reactants in a chemical reaction is referred to as the rate of reaction. It provides some understanding of how quickly a response might occur. For instance, the combustion of cellulose in fire has a very rapid response rate and is finished in a fraction of a second.
The pace at which reactants change into products is known as the rate of reaction or reaction rate. It goes without saying that the pace at which chemical reactions take place varies greatly. While certain chemical reactions occur almost instantly, others often take time to achieve their ultimate equilibrium.
Rate of reaction=Amount of reactant used/Time taken for the consumption of the reactant
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Suppose you discovered a mutant yeast whose glycolytic pathway was shorter because of the presence of a new enzyme catalyzing the reaction: NAD NADH + H" Glyceraldehyde 3-phosphate + Hz 3-phosphoglycerate Would shortening glycolysis in this way be beneficial to the cell? Why or why not?
A mutant yeast whose glycolytic pathway was shorter because of the presence of a new enzyme catalyzing the reaction: Glyceraldehyde 3-phosphate + H₂O + NAD⁺→ NADH + H⁺ + 3-phosphoglycerate will shortening glycolysis and wouldn't benefit the cells (anaerobic cells) because ATP isn't being produced and energy gain will be equal to 0.
What are glycolysis and cellular respiration?Using oxygen and the chemical energy from food, a cell can manufacture energy in the form of ATP through a sequence of chemical reactions known as cellular respiration.
The initial stage in the process of cellular respiration is glycolysis, which is also the only step in anaerobic respiration.
Additionally, the anaerobic processes that generate ATP from glyceraldehyde 3-phosphate (G3P) depend on the enzymes phosphoglycerate kinase and pyruvate kinase.
Anaerobic cells won't benefit from these enzyme mutations because they will impair ATP generation.
In conclusion, because ATP isn't being created and energy gain will be equal to zero, reducing the glycolytic pathway won't help the cells (anaerobic cells).
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. For a particular liquid, raising its temperature from 298 K to 318 K causes its vapor pressure to
double. What is the enthalpy of vaporization of this liquid? (R = 8.31 J/(K- mol))
115 kJ/mol
288 kJ/mol
27.3 kJ/mol
2.53 kJ/mol
270 kJ/mol
a)
b)
c)
d)
e
Answer:
he enthalpy of vaporization is 27.3 kJ/mol. The correct answer is therefore (C) 27.3 kJ/mol.
Explanation:
To find the enthalpy of vaporization, we can use the Clausius-Clapeyron equation, which relates the vapor pressure of a liquid to its enthalpy of vaporization. The equation is given by:
ln(P2/P1) = (delta Hvap / R) * (1/T1 - 1/T2)
where P1 and P2 are the vapor pressures at temperatures T1 and T2, respectively, delta Hvap is the enthalpy of vaporization, and R is the gas constant. In this case, we are given that the vapor pressure doubles when the temperature is raised from 298 K to 318 K, so P2 = 2 * P1. We can plug this into the equation and solve for delta Hvap to find the enthalpy of vaporization:
ln(2) = (delta Hvap / R) * (1/298 - 1/318)
delta Hvap = R * ln(2) / (1/298 - 1/318)
Plugging in the values, we get delta Hvap = 8.31 J/(K-mol) * ln(2) / (1/298 - 1/318) = 27.3 kJ/mol. The correct answer is therefore (C) 27.3 kJ/mol.