The hydrogen bonds between molecules of hydrogen peroxide loosen as temperature rises toward the optimal point, facilitating catalase's reaction with the molecules. The enzyme denatures and its structure is affected if the temperature rises above the ideal level.
What is a catalase?The catalase is an enzyme that is responsible for reducing hydrogen peroxide.
What does catalase do?This enzyme is in charge of neutralizing hydrogen peroxide through its breakdownIt hence preserves an ideal level of the molecule in the cell that is also necessary for cellular signaling processesImportance of catalase enzyme:Almost every organism that is exposed to oxygen contains the very common enzyme catalase. In order to prevent oxidative damage, which can happen when cells or other molecules in the body come into contact with oxidative chemicals, catalase serves as a protective barrier in live cells.To learn more about catalase visit:
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The hydrogen bonds between molecules of hydrogen peroxide loosen as temperature rises toward the optimal point, facilitating catalase's reaction with the molecules. The enzyme denatures and its structure is affected if the temperature rises above the ideal level.
What is a catalase?The catalase is an enzyme that is responsible for reducing hydrogen peroxide.
What does catalase do?This enzyme is in charge of neutralizing hydrogen peroxide through its breakdownIt hence preserves an ideal level of the molecule in the cell that is also necessary for cellular signaling processesImportance of catalase enzyme:Almost every organism that is exposed to oxygen contains the very common enzyme catalase.In order to prevent oxidative damage, which can happen when cells or other molecules in the body come into contact with oxidative chemicals, catalase serves as a protective barrier in live cells.To learn more about catalase visit:
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The correctly reported volume for a rectangular solid that is found to be
12.49 cm x 4.00 cm x 0.90 cm is
cm³?
Based on the melting points of both substances in comparison with the table what's your guess
Based on the melting points of both substances in comparison, my guess is Sodium chloride and glucose are the mystery compounds.This is further explained below.
What is Sodium chloride?Generally, Salt's chemical name is sodium chloride. It is an electrolyte's job to keep your body's fluid balance in check.
In conclusion, Sodium chloride and glucose are the likely candidates based on their relative melting points.
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6. which metal will not be able to be oxidized by any of the other metals listed?
Metal that won't be oxidized:
Metal that will not be able to oxidize by any of the other metals is gold.
What causes oxidation to happen?
This chemical reaction might take place in the air or after the metal has been in contact with acids or water. The most prevalent example is corrosion of steel, which occurs when the iron molecules on the surface of steel change into iron oxides, most frequently Fe2O3 and Fe3O4.
If you've ever seen a rusted-out vehicle or corroded metal bits, you've witnessed oxidation in action.
Metals that don't oxidize:
In their native condition, noble metals like platinum or gold resist oxidation. Ruthenium, rhodium, palladium, silver, osmium, and iridium are more examples of these metals. Humans have developed a wide variety of corrosion-resistant alloys, including brass and stainless steel.
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Part C Compare your proposed process for the synthesis of ammonia from part E of task 2 with the Haber process. Describe at least two similarities and two differences between the processes.
On comparing the proposed processes of ammonia synthesis by dry distillation and Haber process,
The similarities found are both process use natural raw material and The differences between them are Haber process use catalyst (iron) while there is no catalyst in the proposed processDry distillation processAmmonia was mainly produced by the method of dry distillation pf animal waste It can also be prepared from the waste of vegetables which are rich in ammoniaIn this process the nitrites, nitrous acids and hydrogen were reduced to give the nitrogen as a product.Haber process This process involves the reaction between molecules of nitrogen and hydrogen in gaseous phase.The raw materials, nitrogen is obtained from air and the hydrogen is from Water and methane gas.Chemical reaction involved in this process is, N2 + 3H2 ↔ 2NH3The catalyst used in this process is iron which increases the rate of reaction.Learn more about Haber process on
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The volume occupied by 0.4g of hydrogen gas at S.T.P is ________
{H=1.00, Molar volume at S.T.P =22.4dm^3
Answer:
4.48 dm^3
Explanation:
As given in the problem, the conversion factor for the molar volume of all gases is 22.4 dm^3/mole at STP. A mole of all ideal gases will occupy 22.4 liters (dm^3). Calculate the moles of hydrogen contained in 0.4 grams of the gas by dividing the mass by the molar mass of H2. H2 has a molar mass of 2 grams/mole.
(0.4 g)/(2 grams/mole) = 0.2 moles H2
(0.2 moles H2 at STP)*(22.4 dm^3/mole at STP) = 4.48 dm^3 (4.48 liters at STP)
Which normal physiologic process contributes most to the need for acid-base balance?
C. Continuous metabolic production of free hydrogen ions
The processes of creating and breaking down glucose molecules are both examples of metabolic pathways. A metabolic pathway is a chain of related chemical reactions that feed each other. The pathway takes in a single or extra beginning molecule and, through a sequence of intermediates, converts them into merchandise.
Metabolism (stated: meh-TAB-uh-Liz-um) is the chemical reactions within the body's cells that alternate meals into power. Our bodies want this strength to do the entirety from moving to wondering to growing. particular proteins in the body manipulate the chemical reactions of metabolism.
A metabolic product is a compound produced via the cells and is excreted to the extracellular medium. it can be produced in the number one metabolism, e.g. carbon dioxide, ethanol, acetate, or lactate, or an extra complicated one, e.g. a secondary metabolite or a heterologous protein secreted to the extracellular medium.
The question is incomplete. Please read below to find the missing content.
Which normal physiologic process contributes most to the need for acid-base balance
A. Continuous organ production of bicarbonate from carbonic acid
B. Continuous alveolar exchange of oxygen and carbon dioxide
C. Continuous metabolic production of free hydrogen ions
D. Continuous kidney formation of urine from blood
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What two basic geologic processes contributed to the formation of folded mountain ranges like in Glacier National Park?
The two basic geologic processes which contributed to the formation of folded mountain ranges like in Glacier National Park include:
Folding and breaking of sedimentary rocks.Erosion.What is Erosion?This is a geologic process which involve materials in the earth being washed away and transported to other parts by water, wind etc.
In the case of Glacier National Park, ice erodes the mountain thereby resulting in the folding of the sedimentary rocks.
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Oxygen gas generated in the thermal decomposition of potassium chlorate is collected over water. The volume of gas collected is 0.128 L, at a temperature of 297K and a pressure of 762 mm Hg. The vapour pressure of H2O at 297K is 22.4 torr. What is the mass of oxygen collected?
The mass of oxygen collected from the thermal decomposition of potassium chlorate at a temperature of 297 K and 762 mmHg is 0.16 g
How to determine the mole of oxygen producedWe'll begin by obtaining the number of mole of oxygen gas produced from the reaction. This can be obtained by using the ideal gas equation as illustrated below:
Volume (V) = 0.128 L Temperature (T) = 297 KPressure (P) = 762 – 22.4 = 739.6 mmHgGas constant (R) = 62.363 mmHg.L/Kmol Number of mole (n) =?PV = nRT
739.6 × 0.128 = n × 62.363 × 297
Divide both sides by 62.363 × 297
n = (739.6 × 0.128) / (62.363 × 297)
n = 0.0051 mole
Thus, the number of mole of oxygen gas produced is 0.0051 mole
How to determine the mass of oxygen collectedHaven obtain the number of mole of oxygen gas produced, we can determine the mass of the oxygen produced as follow:'
Mole = 0.0051 moleMolar mass of oxygen gas = 32 g/moleMass of oxygen =?Mole = mass / molar mass
0.0051 = mass of oxygen / 32
Cross multiply
Mass of oxygen = 0.0051 × 32
Mass of oxygen = 0.16 g
Thus, we can conclude that the mass of oxygen gas collected is 0.16 g
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The Venn diagram shown below compares the nuclear reactions in the sun and nuclear power plants.
Picture shows two ovals which overlap in the middle. The oval on the left has the label 'Sun' on top and 'A' within it. The oval on the right has the label 'Nuclear power plants' on top and 'Splitting of atoms' within it. The overlapping portion has the label 'Release of energy' within it.
What process is best described by A?
Destruction of atoms
Fission of atoms
Fusion of atoms
Repulsion of atoms
The process which is best described by "A" in this Venn diagram is: C. fusion of atoms.
What is nuclear fusion?Nuclear fusion can be defined as a type of nuclear reaction that involves joining or combining two (2) smaller nuclei of atoms, so as to form a single heavier nucleus accompanied with the release of energy.
Based on the Venn diagram in the image attached below, we can logically deduce that the process which is best described by "A" is fusion of atoms.
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point
Which is the correct balanced equation for copper(II) sulfate + aluminium -->
aluminium sulfate + solid copper?
Answer: 2Al(s) + 3CuSO4(aq) → Al2(SO4)3(aq) + 3Cu(s)
Explanation: The quantities of aluminum and copper sulfate used as reactants will be such that the copper sulfate will be in excess. Thus, the aluminum will be the limiting factor in determining the number of moles (gram-atoms) of products that will be formed.
what is the color of phenolphthalein in weak base
Answer:
Pink
Explanation:
Phenolphthalein is often used as an indicator in acid–base titrations. For this application, it turns colorless in acidic solutions and pink in basic solutions.
hope it helps you and give me a brainliest
Answer:
pink
Explanation:
Phenolphthalein is often used as an indicator in acid–base titrations. For this application, it turns colorless in acidic solutions and pink in basic solutions.
{Mark as brainlest answer}A 100 cc bottle of Amoxicillin 125 oral suspension requires addition of 61 ml of Purified Water to make 100 cc. What is the powder volume
A 100 cc bottle of Amoxicillin 125 oral suspension requires addition of 61 ml of Purified Water to make 100 cc. The powder volume is 76.25.
How do you calculate powder volume ?To calculate the powder volume use the expression
[tex]\frac{H}{Q} = \frac{D}{X}[/tex]
where,
H = Dose on hand
Q = Quantity on hand
D = Desired dose
X = Quantity desired
Now put the values in above expression we get
[tex]\frac{H}{Q} = \frac{D}{X}[/tex]
[tex]\frac{100}{61} = \frac{125}{X}[/tex]
[tex]X = \frac{125 \times 61}{100}[/tex]
X = 76.25
Thus from the above conclusion we can say that A 100 cc bottle of Amoxicillin 125 oral suspension requires addition of 61 ml of Purified Water to make 100 cc. The powder volume is 76.25.
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21. In infrared spectroscopy, absorption of electromagnetic radiation results in transitions between ________ energy levels.
In infrared spectroscopy, absorption of electromagnetic radiation results in transitions between Vibrational energy levels.
What does spectroscopy mean?Definition of spectroscopy Spectrum analysis is the study and measurement of the spectrum that matter emits when it interacts with electromagnetic (EM) radiation. It is the investigation of how frequency or wavelength affects the relationship between matter and radiation.
The various forms of spectroscopy include the following:
Acoustic resonance: A type of spectroscopy that primarily uses the ultrasonic and sonic ranges of sound. It is a popular, affordable approach for classifying and valuing materials.X-ray photoelectron: This technique makes use of the diffraction patterns that X-rays produce as they travel through crystalline materials. The nature of the crystal structure can be inferred from these patterns.You can use circular dichroism, a type of light absorption spectroscopy, to determine how differently a sample absorbs left- and right-circularly polarized light.It is appropriate for exploring the electronic structure of molecules and detecting the compounds present. Ultraviolet-Visible (UV/Vis) Spectroscopy. It aids in the recognition of peptide bonds, coenzymes, side chains of amino acids, and prosthetic groups.NMR Spectroscopy: This technique uses nuclear magnetic resonance to measure the magnetic fields surrounding the nuclei. Radio waves are used to excite atomic nuclei in a material. Spectroscopy of the infrared range of the electromagnetic spectrum is known as infrared spectroscopy. Longer wavelengths and lower frequencies are found in infrared photons, and in infrared spectroscopy, the idea of absorption spectroscopy is used.Raman spectroscopy is a method of spectroscopy used to examine low-frequency system modes such as rotational, vibrational, and other modes.Learn more about Spectroscopy here:-
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Use the portion of the periodic table shown below to answer the questions.
A portion of the first three columns of the periodic table is shown. Column one from top to bottom reads 11 sodium 22.990, 19 potassium 39.098, and 37 rubidium 85.468. Column two reads 12 magnesium 24.305, 20 calcium 40.078, and 38 strontium 87.62. Column three reads 21 scandium 44.956 and 39 yttrium 88.906.
Part 1: Name two elements that have the same properties as sodium (Na). (4 points)
Part 2: Determine the number of protons, electrons, and neutrons present in an atom of calcium (Ca). Explain how you determined your answer using complete sentences. (6 points)
The two elements that have the same properties as sodium are potassium and rubidium .
What is periodic table?The periodic table is an arrangement of the elements in order of increasing atomic number.
From the list, the two elements that have the same properties as sodium are potassium and rubidium .
Proton has an atomic number of 20 and a mass number of 40. The number of electrons is the same as the number of protons. Given that the atomic number is the number of protons present, we have 20 electrons and 20 protons.
Number of neutrons = Mass number - Number of protons
= 40 - 20 = 20 neutrons
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______ is a naturally occurring metal found in the environment as well as manufactured in products. The major source of this metal has historically been from fuels in on-road motor vehicles such as cars and trucks, and industrial sources.
Lead is a naturally occurring metal found in the environment as well as manufactured in products. The major source of this metal has historically been fuels in on-road motor vehicles such as cars and trucks, and industrial sources.
Lead: An Air PollutantBoth naturally occurring in the environment and used in manufactured goods are the metal lead. In the past, industrial sources and fuels used in on-road motor vehicles (such as cars and trucks) have been the main sources of lead emissions. Lead emissions from the transportation industry rapidly reduced by 95% between 1980 and 1999 thanks to regulatory measures in the U.S. to remove lead from gasoline for on-road motor vehicles, while lead levels in the air decreased by 94% over the same period. The areas closest to lead smelters typically have the greatest airborne lead concentrations today. Today, the processing of ores and metals as well as piston-engine aircraft using leaded aviation gasoline are the main sources of lead emissions into the atmosphere.
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Which sample contains the greatest number of atoms?
(a) 27.2 g cr
(b) 55.1 g ti
(c) 205 g pb
Answer:
b option is correct
Explanation:
PLEASE HELP!
You are preparing standard acid and base solutions for the laboratory, using potassium hydrogen phthalate (KHC₈H₄O₄, abbreviated KHP) as the primary standard. KHP (molar mass = 204.22 g/mol) has one acidic hydrogen. You prepared solutions of both NaOH and HCl. It took 22.65 mL of the NaOH solution to titrate (react exactly with) 1.55 g KHP. It then took 25.35 mL of HCl solution to titrate 25.00 mL of the NaOH solution. What is the molarity of the HCl solution?
121) The sugar sucrose has 12 carbon atoms, 22 hydrogen atoms and 11 oxygen
atoms. How would this be written?
A) Co12H22O1
B) CI2H22011
C) C6H1206
D) CacH1206
122) How are the elements organized on the periodic table?
A) Atomic Mass
B) Element Name
C) Symbol
D) No Set Organization
123) Which of the following elements would be considered a compound?
A) CH
B) Si
C)F
D) O6
124) The formula for water is H2O meaning there are 2 Hydrogen atoms and 1
Oxygen. What is the atomic mass of one molecule to the nearest hundredth?
A) 15.99
B) 16.99
C) 17.99
D) 18.99
Answer:
Explanation:
121) The sugar sucrose has 12 carbon atoms, 22 hydrogen atoms and 11 oxygen
atoms. How would this be written?
A) Co12H22O1 [Co is cobalt]
B) CI2H22011 [Yes]
C) C6H1206 [6 C atoms]
D) CacH1206 [Ca is calcium]
122) How are the elements organized on the periodic table?
A) Atomic Mass [Yes, from lightest to heaviest]
B) Element Name
C) Symbol
D) No Set Organization
123) Which of the following elements would be considered a compound?
A) CH [Yes, two or more elements combined]
B) Si [No]
C)F [No]
D) O6 [No, multiple atoms, but same element]
124) The formula for water is H2O meaning there are 2 Hydrogen atoms and 1
Oxygen. What is the atomic mass of one molecule to the nearest hundredth?
A) 15.99
B) 16.99
C) 17.99 [Yes, 16 + 2*1 = 18]
D) 18.99
Question 7 of 10
Carbonic anhydrase is an enzyme in the human body that participates in the
reaction shown below:
CO₂ + H₂O → H₂CO3
How will this reaction be affected if carbonic anhydrase acts as a catalyst?
OA. CO₂ and H₂O will be produced.
OB. H₂CO3 will be produced faster.
OC. H₂CO3 will be produced more slowly.
OD. H₂CO3 will not be produced at all.
SUBMIT
H₂CO₃ will be produced faster if carbonic anhydrase acts as a catalyst and the correct option is option B.
What is Carbonic Anhydrase?Carbonic anhydrase enzyme helps to maintain acid-base homeostasis, fluid balance and regulate pH. Based on its location, the enzyme role changes slightly.
The inter-conversion that occurs between water, carbon dioxide, and dissociated carbonic acid ions, is catalyzed by a group of enzymes that form by carbonic anhydrase, or carbonate dehydratase.
The active site for most carbonic anhydrase is supposed to be a zinc ion, and it is as a result classified as metalloenzymes.
Therefore, H₂CO₃ will be produced faster if carbonic anhydrase acts as a catalyst and the correct option is option B.
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11.A student titrated a diprotic weak acid (H2A) with 0.100 M NaOH. The titration required 22.58 mL of NaOH solution to reach the equivalence point. How many moles of diprotic acid were present
Moles of diprotic acid present were:
A mole of diprotic acid contains 0.0023 moles [tex]H_{2}A[/tex].
Law of dilution:
Titrations are conducted using the law of dilution.
The number of moles of solute divided by the arrangement's volume in liters is known as molarity.
The number of moles per liter of solution is referred to as molarity. Additionally, we write it as M. Furthermore, we employ the following equation to determine molarity:
Molarity = moles of solute/liter of solution.
Calculation:
Moles of acid = moles of base
n = M/V
Moles of [tex]H_{2}A[/tex] = Moles of NaOH used
Therefore, 0.100 x 0.02258L = 0.0023 mol [tex]H_{2}A[/tex]
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A 0.500 L solution of 5 M Hydrochloric acid stock solution is used to make a diluted Hydrochloric acid solution of 2.08 M . How much water has to be used to dilute the stock solution
Answer:
0.702 L H₂O
Explanation:
To find the volume of water needed to dilute the stock solution, you need to (1) find the moles of the stock solution (via molarity formula), then (2) find the volume of the diluted solution (via molarity formula), and then (3) find the volume of water needed.
(Step 1)
Molarity (M) = moles / volume (L) <----- Molarity formula
5 M = moles / 0.500 L <----- Insert values
2.5 = moles HCl <----- Multiply both sides by 0.500
(Step 2)
Molarity = moles / volume <----- Molarity formula
2.08 M = 2.5 moles / volume <----- Insert values
(2.08 M) x volume = 2.5 moles <----- Multiply both sides by volume
volume = 1.20 L <----- Divide both sides by 2.08
(Step 3)
Diluted Volume = 1.20 L
Stock Volume = 0.500 L
Water Volume = ? L
Diluted Volume = Stock Volume + Water Volume
1.20 L = 0.500 L + Water Volume
0.702 L = Water Volume
Which component of delegation is the ability to perform duties in a specific role?
The component of delegation which speaks to the ability to perform a specific task is: Authority.
What is delegated Authority?The division of work and assignment of decision-making authority to a person who answers to a leader or management is referred to as delegation of authority.
It is an organizational technique in which a management assigns each employee a portion of their own workload.
What is the difference between delegated authority and responsibility?While the superior may transfer power to followers, responsibility is taken, or it is built into the duty that was given to the subordinate.
While responsibility calls for the capacity for compliance or obedience, the capacity to obey directions, authority requires the capacity to issue orders and instructions hence - responsibility.
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a student carried out a combustion reaction with methane (ch4) as the limiting reagent. a 12.0g quantity of methane was used, and the student collected 22.0g of carbon dioxide. what was the percent yield
The total percent yield:
After the combustion reaction with methane, the percent yield was 66.7%.
Combustion of Methane:
Methane produces a blue flame as it burns in the atmosphere.Methane burns in the presence of enough oxygen to produce carbon dioxide (CO₂) and water (H₂O). It creates a significant quantity of heat during combustion, making it an excellent fuel source.The other reactant, air's excess oxygen, is always present, making methane the limiting reactant. As a result, the amount of CH₄ burned will determine how much CO₂ and H₂O are produced.
The following chemical process produces carbon dioxide from methane:
CH₄ + 2O₂ ⇒ CO₂ + 2H₂O
Calculations:
1. Theoretical quantity of carbon dioxide:
All calculations will be based on the amount of methane because the problem specifies that it is the limiting reagent:
12.0g of CH₄ × (1 mol of CH₄/16g CH₄) × (1 mole of CO₂/1 mole of CH₄) × (44g CO₂/1 mole of CO₂)
= 33g of CO₂
2. Percent yield:
= Actual yield/Theoretical yield × 100
= 22.0g/33g × 100
= 66.7%
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Identify all resonance forms of the enolate formed, and indicate whether or not a substantial amount of starting ketone will be present together with the enolate at equilibrium. (select all that apply)
At equilibrium, a significant quantity of starting ketone will be present with the enolate in the first case.
What is ketone?Ketones are substances produced by the liver. It is formed when there is insufficient insulin in the body to turn sugar into energy.
What happens in scenario two where the formation of possible enolate ions from the cyclohexan-1, 4-di.ketone by abstraction of acidic proton by suing sodium ethoxide base occurs?In this case a substantial amount of ketone will exist along side the enolate at equilibrium.
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What is the stoichiometric coefficient in front of the oxygen (o2) in the balanced version of this reaction? c4h8(l) o2(g) â co2(g) h2o(g) (unbalanced)
The stoichiometric coefficient in front of the oxygen ([tex]O_{2}[/tex]) in the balanced version of the reaction will be 6.
The number that must be present before the atoms, molecules, or ions is known as the stoichiometric coefficient. Fractions, as well as whole numbers, can be used as stoichiometric coefficients. Essentially, the coefficients assist us in determining the mole ratio of reactants to products.
The balanced chemical reaction will be
[tex]C_{4} H_{8} +6O_{2}[/tex] → [tex]4CO_{2} +4H_{2} O[/tex]
It can be seen that the stoichiometric coefficient in front of oxygen is 6.
Therefore, stoichiometric coefficient in front of oxygen will be 6.
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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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Disclaimer: The question was given incomplete on the portal. Here is the complete question.
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 millions of organic compounds but only thousands of inorganic compounds because:______
Answer:
There are millions of organic compounds but only thousands of inorganic compounds because:
a. organic compounds were formed by living things.
b. there is more carbon on Earth's surface than any other element.
c. atoms of elements other than carbon never combine with themselves.
d. carbon atoms can combine with up to four other atoms, including other carbon atoms.
A solution is prepared by dissolving 117 grams of salt (NaCI) in 250 milliliters of water (H_{2}*O) What is the molarity of the solution?
D. 468 M NaCI
C. 8.0 M NaCl
A. 0.47 M NaCI
B. 8 * 10 ^ - 3 * MNaCl
Taking into account the definition of molarity, the molarity on the solution is 8 M.
Definition of molarityMolar concentration or molarity is a measure of the concentration of a solute in a solution and indicates the number of moles of solute that are dissolved in a given volume.
The molarity of a solution is calculated by dividing the moles of solute by the volume of the solution:
[tex]Molarity=\frac{number of moles}{volume}[/tex]
Molarity is expressed in units [tex]\frac{moles}{L}[/tex].
This caseIn this case, you know that:
number of moles= 117 gramsx[tex]\frac{1 mole}{58.45 grams}[/tex]= 2 moles, where 58.45[tex]\frac{g}{mole}[/tex] is the molar mass of NaCl.volume= 250 mL= 0.250 L (being 1000 mL= 1 L)Replacing in the definition of molarity:
[tex]Molarity=\frac{2 moles}{0.250 L}[/tex]
Solving:
Molarity= 8 [tex]\frac{moles}{L}[/tex]= 8 M
Finally, the molarity on the solution is 8 M.
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If you are given 0.25 mol of Fe and 0.5 mol of O2, what is the limiting reactant?
The limiting reactant will be Fe.
What are limiting reactants?They are reactants that are available in limited quantities, as compared to other reactants, during the course of reactions.
From the equation of the reaction: [tex]4Fe + 3O_2 --- > 2Fe_2O_3[/tex]
The mole ratio of Fe to O2 is 4:3.
Thus, for 0.25 mol Fe, 0.25 x 3/4 = 0.1875 mol of O2 is required.
With 0.5 mol of O2 available, it means oxygen is in excess while Fe is limited in availability.
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The limiting reactant from the calculations is Fe.
What is the limiting reactant?The limiting reactant is the reactant that is present in the least amount in solution. Now we have the equation as; 4Fe+ 3O2 → 2Fe2O3
If 4 moles of Fe reacts with 3 moles of O2
0.25 mol of Fe reacts with 0.25 mol * 3 moles/4 moles
= 0.1875 moles of O2
It then follows that the limiting reactant is Fe.
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The gas arsine, AsH3, decomposes as follows: In an experiment at a certain temperature, pure AsH3(g) was placed in an empty, rigid, sealed flask at a pressure of 392.0 torr. After 48 hours the pressure in the flask was observed to be constant at 488.0 torr. a. Calculate the equilibrium pressure of H2(g). b. Calculate Kp for this reaction
The equilibrium pressure of [tex]H_{2}[/tex] is 288 torr. and [tex]K_{p}[/tex] for this reaction is 0.786 atm.
from the reaction:- [tex]2AsH_{3}[/tex] ⇄ [tex]2As + 3H_{2}[/tex]
initial concentration 392 torr. 0
at equilibrium. 392 - [tex]2x[/tex]. [tex]3x[/tex]
and the final pressure in the flask = 488 torr.
Hence,
[tex]( 392 - 2x ) + 3x = 488\\ x = 488-392\\x = 96 torr.[/tex]
The partial pressure of [tex]H_{2}[/tex] is 3 × 96 = 288 torr.
and [tex]AsH_{3}[/tex] is 392 - ( 2 × 96 ) = 392 - 192 = 200 torr.
Now, to find [tex]K_{p}[/tex] for this reaction, we will use [tex]K_{p} = \frac{(P_{H_{2} })^{2} }{( P_{AsH_{3} } )^{2}}[/tex]
putting all the values, we get,
[tex]K_{p} = \frac{(288)^{3} }{(200)^{2} }[/tex]
= 597.1968 torr.
= 0.786 atm. ( 1 atm = 760 torr. )
what do you mean by equilibrium?
Equilibrium in chemistry is the phase that exists when a chemical reaction and its opposite reaction happen at the same rates. This word's Latin origin dates back to the prefix aequi-, which means equal, and lbra, that indicates scale or balance.
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