When a 15.0-g sample of nitrogen is burned in excess oxygen. Which result is a single gas with a mass of 49.3 grams. the empirical formula of the gas is NO2.
What is a Nitrogen?The chemical element with the atomic number 7 and the letter N is known as nitrogen. The lightest element in group 15 of the periodic table, often termed as the pnictogens, nitrogen is a nonmetal. It is a typical element in the cosmos, believed to be eighth in the Milky Way and the Solar System in terms of overall abundance.
Nitrogen has the following general specifications:Symbol: NAtomic number: 7Atomic mass: 14.0067 uElectrons per shell: 2,5Electron configuration: [He] 2s22p3Discoverer: Daniel RutherfordChemical series: Nonmetal, Pnictogen, Period 2 elementTo know more about Nitrogen visit
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Based on your answer to Part B, what is the average rate of formation of HF? Express your answer to three decimal places and include the appropriate units.
For the general reaction a A+B , relative rates are expressed as follows: where B) is the concentration of substance B, A) is the concentration of substance A, and t is the time. The lowercase letters a and b stand for the coefficients of A and B in the chemical equation, respectively. The greek symbol A (delta) means "change in."
The average rate of hydrogen fluoride generation, as determined by your response to Part B, is rate = 1.12 10(4) M/s.
Why does hydrogen fluoride corrode so badly?corrosive due to the acid's H+ ions and poisonous due to the fluoride ions F-, which can penetrate deeply, chelate calcium and magnesium, and thus upset biological balances due to the destruction of the skin's or an eye's outermost layer.
A strong or weak acid, is HF?Hydrofluoric acid, sometimes known as HF, is a weak acid. HF is a powerful corrosive, yet it isn't a strong acid. Since H and F have a very tight link, HF doesn't dissociate very much in water.
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Your answers to Part B led you to the conclusion that the overall return of hydrogen fluoride creation is speed = 1.12 10(4) M/s.
Why corrodes hydrogen fluoride so severely?Caustic because of the anticholinergic H+ ions and dangerous because of the fe(iii F-, which may penetrate profoundly, combine calcium and magnesium and alter biological balances by ruining the skin's or even an eye's outer layer.
Is HF a high or low acid?The acid hydrofluoric acid, sometimes referred to as HF, is weak. Although HF is a potent acidic, it is not a strong acid. HF is does not disintegrate a great deal in water because H and E have an extremely strong bond.
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A lab student notified the TA of a SMALL hazardous chemical spill. Under the TA's guidance, the student used the spill kit materials to clean it. Which of the following is NOT the student's responsibility
Following is NOT the student's responsibility : schedule a retraining session on materials handling with the safety coordinator.
What is the responsibility when hazardous chemical spill occurs?It is important to notify your instructor of the chemical spills immediately. You should immediately warn everyone that something has been spilled and never touch, smell or in any other way interact with the chemical before you know what you are dealing with.
If you spill a large amount, make sure you evacuate the lab, and call the emergency personnel. It is important to have spill control and personal protective equipment appropriate for chemicals being handled readily available.
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Note: the question given on portal is incomplete. here is the complete question.
Question: A lab student notified the TA of a SMALL hazardous chemical spill. Under the TA's guidance, the student used the spill kit materials to clean it. Which of the following is NOT the student's responsibility
a) prompt and proper clean-up.
b) to have spill control and personal protective equipment appropriate for the chemicals being handled readily available.
c)schedule a retraining session on materials handling with the safety coordinator.
d)Immediately report the spill to the appropriate emergency response office.
Calculate the concentration of H+ ions in a 0.010 M aqueous solution of sulfuric acid. H2SO4 (aq)<===> H+(aq)+HSO4^-(aq), Ka1=Large. HSO4^-(aq)<====> H^+ (aq)+SO4^-2(aq), Ka2=0.012.
The concentration of H+ ions in a 0.010 M aqueous solution of sulfuric acid is equal to 0.010 M.
In aqueous solution, sulfuric acid (H2SO4) ionizes to form hydrogen ions (H+) and sulfate ions (HSO4-). This is a strong acid, and it is almost completely ionized. The Ka1 for H2SO4 is very large, which means that it is essentially 100% ionized.
The HSO4- ion can also dissociate to form H+ and SO4^-2 but the Ka2 is small. So in this case, it can be considered that the concentration of HSO4- is negligible compared to H+ ions concentration.
Therefore, the concentration of H+ ions in a 0.010 M aqueous solution of sulfuric acid is equal to the concentration of sulfuric acid, which is 0.010 M.
It's important to note that sulfuric acid is a strong acid and it is almost completely dissociated in aqueous solution, so the concentration of H+ ions is equal to the initial concentration of sulfuric acid.
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5. Photons are not considered as objects in the traditional sense, as they cannot exist in a
stationary state.
a.True
b. False
Answer:
No
Explanation:
They are also not considered "objects" in the traditional sense, as they cannot exist in a stationary state.
what quantity of compound 1 must be provided to prepare 100.00 ml of solution with a concentration equal to ki?
Heat made from compound 1 are kinetically controlled, whereas those made from benzaldehyde are not. The fluid concentration for liposomes that vaporize at 20 mL is 0.1 mm.
What alteration to the experimental setup will produce quantifiable heat differences and Estimate K1?What alteration to the experimental setup can produce quantifiable heat variations and Kapp > K1 Dilute each and every solution. Compound 1 should be present at higher concentrations in both titrations.
Which experimental method is used to assess heat exchange quantitatively?Assessment of Heat Flow
Calorimetry is a method that we can employ to gauge how much heat is generated during a chemical and physical process. The quantity of heat that is transported from or to a substance is measured using calorimetry. As a result, the heat.
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a 500.0 ml sample of gas at a pressure of 70.93 kpa is transferred to a 1050.0 ml vessel at a constant temperature. what is the pressure of the gas in the larger vessel?
The pressure of the gas in the larger vessel when a 500.0 ml sample of gas at a pressure of 70.93 kPa is transferred to a 1050.0 ml vessel at a constant temperature is 33kPa.
Given the volume of sample gas (V1) = 500ml = 0.5L
The pressure of gas (P1) = 70.93kPa
The volume of vessel (V2) = 1050ml = 1.05L
The temperature is kept constant.
Then the pressure of the gas in the larger vessel =P2
We know that from Boyles law PV = nRT
As temperature is kept constant we can say that P1V1 = P2V2
Such that (70.93 x 10^3) x (0.5) = P2 x (1.05)
P2 = 33kPa
Hence the pressure of the gas in the larger vessel is 33kPa.
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which sentence describes one characteristic of nonmetals? responses nonmetals are often brittle solids. nonmetals are often brittle solids. nonmetals often conduct electricity. nonmetals often conduct electricity. nonmetals are often malleable. nonmetals are often malleable. nonmetals are often ductile. nonmetals are often ductile.
The sentence which describes one characteristic of nonmetals is nonmetals are brittle and ductile in nature.
Non-metals are those which warrant all the metallic attributes. They're good insulators of heat and electricity. They're substantially feasts and occasionally liquid. Some of also are indeed solid at room temperature like Carbon, Sulphur and phosphorus.
Brittleness describes the property of a material that fractures when subordinated to stress but has a little tendency to distort before rupture. Brittle accoutrements are characterized by little distortion, poor capacity to repel impact and vibration of cargo, high compressive strength, and low tensile strength.
A material's capability to suffer significant plastic distortion under tensile stress before rhapsody is called the ductile parcels of the material. The ductile accoutrements are nickel, etc.
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Consider the following unbalanced equation for the combustion of hexane:αC6H14(g)+βO2(g)→γCO2(g)+δH2O(g)A. Balance the equation.B. Determine how many moles of O2 are required to react completely with 5.2 moles C6H14
4.08 moles of O2 are required to react completely with 5.2 moles C6H14.
What is unbalanced equation?Chemical equations that are out of balance have the number of atoms of each element on the left side of the equation not matching the number of atoms of each element on the right side. Chemical reactions cannot be correctly represented by equations that are not balanced; balanced equations are necessary.
A. To balance the equation, we need to determine the correct coefficients (α, β, γ, δ) for the reactants and products such that the number of atoms of each element is equal on both sides of the equation.
We can see that we need 14 carbon atoms on both sides, 14 hydrogen atoms on both sides, and 6 oxygen atoms on both sides
Balancing the equation:
C6H14(g) + 19/5 O2(g) → 6CO2(g) + 7H2O(g)
B. To determine the moles of O2 required to react completely with 5.2 moles of C6H14, we can use the balanced equation. We know that the ratio of C6H14 to O2 is 1:19/5. Therefore, to react completely with 5.2 moles of C6H14, we need 19/5 * 5.2 moles of O2, which is approximately 4.08 moles of O2.
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how is the prevention of an epidemic different from the prevention of a pandemic
Prevention of an epidemic is different from the prevention of a pandemic because the first situation does not involve the spread of the pathogenic agent worldwide.
What is the major difference between a pandemic situation and an epidemic situation?The major difference between a pandemic situation and an epidemic situation is based on the fact that an epidemic is restricted to a certain area while a pandemic encompasses worldwide.
Therefore, with this data, we can see that the major difference between a pandemic situation and an epidemic situation is the length of extension of the invective agent.
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when 2.75 dm3 of o2 reacts with an excess of glucose, according to the reaction below, what volume of carbon dioxide will be produced
2C6H12O6(s) + 6O2(g) -> 12CO2(g) + 6H2O(l)
The reaction given is a combustion reaction of glucose. The balanced equation tells us that for every 2 moles of glucose, 6 moles of O2 are consumed and 12 moles of CO2 are produced.
We are given that 2.75 dm3 of O2 is reacting, which we can convert to moles using the ideal gas law PV = nRT where P is pressure, V is volume, n is the number of moles, R is the ideal gas constant and T is temperature.
Given that the temperature is in Kelvin and R = 8.314 J K-1mol-1
n = (PV) / RT = (2.75 dm3 * 1atm) / (8.314 J K-1mol-1 * 298K) = 0.0591 mol O2
Since the number of moles of O2 is 0.0591 mol, the number of moles of CO2 produced will be 12 * 0.0591 mol = 0.709 mol
To find the volume of CO2 produced, we can use the ideal gas law again:
V = nRT/P
V = (0.709 mol * 8.314 J K-1mol-1 * 298K) / 1 atm = 16.27 dm3
So the volume of carbon dioxide produced will be 16.27 dm3.
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a balloon contains 0.5 l of air at 101.5 kpa. you squeeze it to a volume of 0.25 l. what is the pressure of air inside the balloon? responses 0.25 kpa 0.25 kilopascal 50.8 kpa 50.8 kilopascal 102 kpa 102 kilopascal 203 kpa
The pressure of air inside the balloon is 203 kPa. This is because the pressure of a gas is directly proportional to its volume.
What is directly proportional?Directly proportional is a mathematical term used to describe a linear relationship between two variables, where a change in one variable is directly reflected by a proportional change in the other variable. For example, if the number of hours a person works increases, the amount of money they earn will also increase proportionally. This linear relationship is also known as a "direct relationship" or a "direct variation".
Since you have halved the volume of the balloon, the pressure has doubled. The initial pressure of 101.5 kPa multiplied by 2 equals 203 kPa.
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The atoms in a ____ have a definite volume, but move quickly enough to overcome the forces of attraction between them.A. SolidB.LiquidC.Gas
The atoms in a Liquid have a definite volume, but move quickly enough to overcome the forces of attraction between them.
What is the forces of attraction?Any specific force that pulls two things or particles toward one another is referred to as a force of attraction. The gravitational, electrostatic, and magnetic forces are three such forces that are related to the many concepts and characteristics of the item.Intermolecular force is the force of attraction that unites two atoms or molecules to form a molecule or other substance. In essence, nature is beautiful. It also works between atoms and ions. For matter that is solid, liquid, or gaseous, the intermolecular force differs.London dispersion forces (LDF), dipole-dipole interactions, and hydrogen bonds are the three different intermolecular forces. All substances at least contain LDF, but molecules can have any combination of these three types of intermolecular interactions.Learn more about Force of attraction refer to ;
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Kindly answer please.
Answer:
Explanation:
To calculate the enthalpy change for the reaction between zinc (Zn) and copper sulfate (CuSO4), we will use the method of calorimetry. This method involves measuring the heat absorbed or released by a reaction and using this information to calculate the enthalpy change of the reaction.
The method for calculating the enthalpy change for this reaction is as follows:
Obtain a calorimeter, such as a bomb calorimeter or a coffee cup calorimeter, and ensure that it is properly insulated to prevent heat loss.
Measure out a known volume of 1 M copper sulfate solution, and carefully add an excess of zinc powder to the solution. Be sure to measure the initial temperature of the solution before the reaction.
Start the reaction by mixing the zinc and copper sulfate together, and monitor the temperature of the solution as the reaction proceeds. Record the final temperature of the solution after the reaction has reached equilibrium.
Use the heat capacity of the calorimeter (Ccal) and the change in temperature (ΔT) to calculate the heat absorbed or released by the reaction. The heat absorbed or released by the reaction can be calculated using the formula: q = Ccal x ΔT
Once you have the heat absorbed or released by the reaction, you can use the molar enthalpy of the reaction (ΔH) to calculate the enthalpy change of the reaction. ΔH = q/ n
where n is the number of moles of Zn that reacted.
Repeat the experiment several times to confirm the results.
It's important to note that to get a precise result, the solution should be well mixed, the reaction should be carried out at constant pressure, and the heat loss should be minimized by using an insulated container.
Also, it's important to check the zinc powder and copper sulfate are not contaminated with other materials that could affect the result.
no amino acid molecule by itself can speed up or catalyze reactions between other molecules; however, when amino acids are joined together to make a protein with catalytic properties, the new structure (enzymatic protein) can speed up the rate of a specific chemical reaction. what does this illustrate? view available hint(s)for part a no amino acid molecule by itself can speed up or catalyze reactions between other molecules; however, when amino acids are joined together to make a protein with catalytic properties, the new structure (enzymatic protein) can speed up the rate of a specific chemical reaction. what does this illustrate? the complexity/simplicity paradox the summation theory energy flow, processing, and utilization emergent properties polymer duality
Emergent characteristics are those traits that develop when smaller pieces come together even though they do not independently possess any of those traits.
What are amino acids?Amino acids are the building blocks of proteins. Life's essential building blocks are proteins and amino acids. Byproducts of the breakdown or digestion of proteins are amino acids. The human body uses amino acids to make proteins that help with food dissection. The amino group and carboxyl-acid group of the fundamental structure are referred to as "amino acids." There are 21 amino acids in proteins, and each one has a distinct R group or side chain.
What is the role of amino acids?The creation of body protein and other vital nitrogen-containing substances like creatine, peptide hormones, and certain neurotransmitters depends on amino acids. The biological need is for amino acids, even though allowances are portrayed as protein.
Emergent properties are characteristics of a set of things, like atoms, buildings, or insects, that you wouldn't find in any of the parts alone.
Although the amino acids are independent molecules, when they work together to form enzymes, they exhibit qualities that they do not individually. This is a classic illustration of emergent features.
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a 600. ml beaker has an inner diameter of 73.0 mm. what is the vertical distance between the 100. ml marks on the side of the beaker? give your answer in cm.
There are 2.15 cm between each 100 mL mark. The formula; is used to determine a cylinder's molarity volume. V = πr^2h.
What is the straightforward meaning of molarity?The number of moles of a solute per liter of a solution is known as molarity. The molar concentration of a solution is another name for molarity.
What in chemistry is molality?The term "total moles of a solute contained in a kilogram of a solvent" is used to describe molality. Molal concentration is another name for molality. It gauges the amount of solute in a solution.
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bactroban ointment contains 2% mupirocin. how many grams of a polyethylene glycol ointment base must be mixed with the contents of a 44-g tube of the bactroban ointment to prepare one having a concentration of 5mg/g
The components of a 44-g tube must be combined with 132 g of something like a polyethylene glycol active substance.
Describe Polyethylene.The most popular plastic there in world is polyethylene (PE), which belongs to the significant polyolefin resin family. They are created using ethylene catalytic polymerization [11]. It is a viscoelastic polymer made up of numerous long chains that are combined from ethylene-based monomer units.
What is polyethylene used for?The main applications include squeeze bottles, household goods, agricultural mulch, garbage and grocery bags, wire or cable insulator, package film, and trash and retail bags.
44 x 0.02 = 0.88 g
y = no. of g base
5 mg = 5 / 1000
= 1 / 200
0.88 / (y + 44) = 1/200
88 / 100 = (y + 44) / 200
88 = (y + 44) / 2
176 = y + 44
y = 132 g
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Calculate how many moles is 37g of calcium hydroxide.
Answer:
0.5 mol
Explanation:
37/(40+2+32)=0.5 mol
The rate constant of a certain reaction is known to obey the Arrhenius equation, and to have an activation energy =Ea20. 0/kJmol. If the rate constant of this reaction is ×7. 7107·M−1s−1 at 221. 0°C, what will the rate constant be at 253. 0°C?
Round your answer to 2 significant digits
If the rate constant of this reaction is 7. 7107M1s1 at 221. 0°C, it is 11.3 M-1s-1 at 253. 0°C.
To find the rate constant at 253.0°C, we can use the Arrhenius equation: k = A * e^(-Ea / RT).where k is the rate constant, A is the pre-exponential factor, Ea is the activation energy, R is the gas constant, and T is the temperature in Kelvin.
We know that the activation energy is Ea = 20.0 kJ/mol, and
the rate constant at 221.0°C is k1 = 7.7107 M^-1s^-1. We can use the known values to find the pre-exponential factor
A:k1 = A * e^(-Ea / R * T1) 7.7107 M^-1s^-1
= A * e^(-20.0 * 10^3 J/mol * (1/8.314 J/mol * K) * (494.0 K)).
A = 7.7107 * e^(20.0 * 10^3 J/mol / (8.314 J/mol * K) * (221.0 - 273.15)).
We can now use this value of A to find the rate constant at 253.0°C:
k2 = A * e^(-Ea / R * T2) = A * e^(-20.0 * 10^3 J/mol / (8.314 J/mol * K) * (526.15 K)).
k2 = 7.7107 * e^(20.0 * 10^3 J/mol / (8.314 J/mol * K) * (221.0 - 273.15)) * e^(-20.0 * 10^3 J/mol / (8.314 J/mol * K) * (253.0 - 273.15)).
k2 = 11.3 M^-1s^-1So the rate constant at 253.0°C is 11.3 M^-1s^-1 rounded to 2 significant digits.
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what is the net ionic equation that occurs when zinc nitrate and lithium phosphate are mixed together in water? a precipitate of zinc phosphate is formed.
The net ionic equation that occurs when zinc nitrate and lithium phosphate are mixed together in water is 3Zn2+ + 2PO43- ⟶ Zn3(PO4)2(s)
When zinc nitrate and lithium phosphate are combined in water, a precipitate of zinc phosphate is created. It is an insoluble white solid. The compounds that are directly engaged in the chemical reaction are the only ones that are shown in the net ionic equation. Two soluble ionic chemicals are involved in the double replacement reaction.
In an aqueous solution, zinc nitrate, Zn(NO3)2, fully dissociates into zinc cations, Zn2+, and nitrate anions, NO3-.
In an aqueous solution, lithium phosphate (Li3PO4) fully dissociates into lithium cations (Li+) and phosphate anions (PO4)3-.
3Zn2+ + 2PO43- ⟶ Zn3(PO4)2(s)
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What would happen to the pressure of a gas inside is sealed bottle if the bottle was cooled to half its original temperature?
The pressure of a gas inside is sealed bottle if the bottle was cooled to half its original temperature then the pressure would also decrease by half of its original value and the volume remains constant.
What is pressure ?The term pressure is defined as an expression of force exerted on a surface per unit area. If we applied force F on area A , then pressure
P = F / A.
The pressure of a gas inside is sealed bottle if the bottle was cooled to half its original temperature then the pressure would also decrease by half of its original value and the volume remains constant.
Thus, the pressure would also decrease by half of its original value and the volume remains constant.
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an unknown element is determined to have two naturally occurring isotopes. isotope 1 is 64.11% abundant and has a mass of 68.925580 u, and isotope 2 has a mass of 70.9247005 u. determine the atomic mass of the unknown element. express your answer to four significant figures.
an unknown element is determined to have two naturally occurring isotopes. isotope 1 is 64.11% abundant and has a mass of 68.925580 u, and isotope 2 has a mass of 70.9247005 u, the atomic mass of the unknown element is 69.64 u.
What is percentage abundant?The proportion of a given element's all-natural isotopes is known as its percent abundance. An element's relative abundance is its frequency in the environment as compared to all other elements, expressed as a percentage. The quantity of isotopes and their relative abundances are all that are required to determine an element's atomic weight, as was previously said.
Given that,
isotope 1 is 64.11% abundant (X₁)
isotope 2 percentage abundant is (X₂) = (100 - 64.11) = 35.89
Mass of isotope (M₁) = 68.925580 u
Mass of another isotope (M₂) = 70.9247005 u
atomic mass of the unknown element = (M₁ X₁ + M₂ X₂) / 100%
M = (68.925580 × 64.11) + (70.9247005 × 35.89) / 100%
M = 69.64
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A typical amino acid has an amino group, a carboxyl group and a R side chain attached to a carbon and Hydrogen. Which one of these imparts the unique characteristics to an amino acid (which is going to be different in each amino acid)
The R side chain imparts the unique characteristics to an amino acid.
Amino acids are organic compounds that have a characteristic carboxyl group (-COOH) and an amino group (-NH2) as well as an R group. The R group, also known as the side chain, is a unique group of atoms that imparts distinct chemical properties to each amino acid. The R group can be polar or non-polar, acidic or basic, hydrophobic or hydrophilic, and it can also be an aromatic group, a sulfur-containing group or others.
The R group is what makes each amino acid unique, determining its chemical properties and its role in biological processes. For example, the R group of glutamic acid is polar and acidic while the R group of alanine is nonpolar and neutral. The unique properties of the R group determine how the amino acid interacts with other molecules and how it functions in biological systems such as enzymes and proteins.
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Consider the unbalanced equation for the oxidation of aluminum._Al _O2 Right arrow. _Al2O3Which sequence of coefficients should be placed in the blanks to balance this equation
Answer: 4Al + 3O2 -> 2Al2O3
Explanation:
What I did was:
The product has 3 oxygens while the reactant has 2. So if you multiply the reactant by 3 and the product by 2 then the amount of oxygens on both sides will be equal (both sides have 6)
Then since there are now 4 Al on the product sides after multiplying by 2 for the oxygen (2 Al2 = 4 Al), there must be 4 Al on the reactants side.
Classify each of the following substances as an element, a compound, or a mixture.
A) Flourine, F
B) Boron Nitride, BN
C) Iron, Fe
D) Vinegar
E) Hydrogen Peroxide, HOOH
The following substances as an element, a compound, or a mixture.
A) Fluorine = element
B) Boron nitride = compound
C) Iron = element
D) Vinegar = mixture
E) Hydrogen peroxide = compound
The substances as an element , a compound or a mixture is given as :
A) Fluorine = This is an element with the symbol of the F. The atomic number of the Fluorine is 9. The fluorine is place in the halogen groups in the periodic table.
B) Boron nitride = This Boron nitride is a compound. The boron nitride is the crystalline compound.
C) Iron = This is an element with the atomic symbol of Fe . The atomic number of the iron is 26.
D) Vinegar = This is a mixture of the water and the acetic acid.
E) Hydrogen peroxide = This is the chemical compound. The formula of the hydrogen peroxide is H₂O₂.
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How many atoms are in 2.54 L oxygen gas, 02?
Answer: 2.94x10^22 atoms of O2
Explanation:
To determine the number of atoms in a given volume of a gas, you need to know the molar volume of the gas and the number of moles of the gas present.
The molar volume of a gas at standard temperature and pressure (STP) is 24.45 L/mol. At STP, the pressure is 1 atm and the temperature is 0°C (273.15 K).
So, to find the number of moles of a gas present in a container, you can use the Ideal Gas Law: PV = nRT.
Where:
P = pressure (atm)
V = volume (L)
n = number of moles
R = ideal gas constant (0.0821 L·atm/mol·K)
T = temperature (K)
So we can rearrange the formula to find n = PV/RT
n = (2.44 atm * 2.54 L) / (0.0821 L·atm/mol·K * 275 K) = 0.049 moles
To find the number of atoms of O2, we just multiply the number of moles by Avogadro's number which is 6.022x10^23 atoms/mol.
So the number of atoms of O2 in 2.54 L at 2.44 atm and 275 K is:
6.022x10^23 atoms/mol * 0.049 moles = 2.94x10^22 atoms of O2
This is the number of atoms of O2 present in the container.
Given the values of ΔH∘rxn, ΔS∘rxn, and T below, determine ΔSuniv.
A. ΔH∘rxn= 84 kJ , ΔSrxn= 144 J/K , T= 300 K
Express your answer using two significant figures.
ΔSuniv =
Predict whether or not the reaction will be spontaneous.
B. ΔH∘rxn= 84 kJ , ΔSrxn= 144 J/K , T= 751 K
Express your answer using one significant figure.
ΔSuniv =
Predict whether or not the reaction will be spontaneous.
C. ΔH∘rxn= 84 kJ , ΔSrxn=− 144 J/K , T= 300 K
Express your answer using two significant figures.
ΔSuniv =
Predict whether or not the reaction will be spontaneous.
D. ΔH∘rxn=− 84 kJ , ΔSrxn= 144 J/K , T= 406 K
Express your answer using two significant figures.
ΔSuniv =
Predict whether or not the reaction will be spontaneous.
The reaction will be spontaneous value of ΔSuniv = -116 J/K
a) ΔSsurr = -ΔH∘rx/T
ΔSsurr = -84 kJ/ 300 K = 0.28 kJ/K = 28.0 J/K
ΔSuniv = ΔSsyst + ΔSsurr
ΔSuniv = -144J/K + 28.0 J/K = -116 J/K
This will be spontaneous
b) ΔSssur = -84 kJ/ 751 K = 0.1118 kJ/K = 111.8 J/K
ΔSuniv = 144J/K + 111.8 J/K = 255.8 J/K
This is non-spontaneous
c) ΔSssur = - 84 kJ/ 300 K = - 28.0J/K
ΔSuniv = - 144J/K + (-28.0) J/K = - 172 J/K
This will be spontaneous
d) ΔSssur = +84 kJ/ 406 K = 0.2068 kJ/K = 206.8 J/K
ΔSuniv = 144J/K + 206.8 J/K = 350.8 J/K
This will be non-spontaneous
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how can you determine if an anion will act as a weak base? write a generic equation showing the reaction by which an anion, a-,acts as a weak base.
A- + H2O -> HA + OH-, anion that acts as the nucleophile of a dangerous chemical is pH- neutral, according to the question, anion that is organic compound with the formula of such a weak base is itself a weak base.
With an example, what is weak base?The fundamental elements that are unable to completely oxidise in water are known as weak bases. Ammonia is one substance that is a weak base. When NH3 is dissolved by water, some of it interacts with the water vapor and breaks down into ammonium ion and hydroxide anions.
NaOH: Is it a weak base?NaOH totally separates from water to produce Na+ and OH. Because all of the [OH] in NaOH is in the solution as [OH] that is ready to receive protons, it is regarded as a strong base.
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PLS HELP USING ALL MY POINTS AND WILL MARK BRAINLIEST
1. Fill in table 5.2
2. Which metal is the most reactive? How do you know this?
3. Rank the metals in order of increasing reactivity
4. Give the chemical equations for each single replacement reaction that took place
5. Was Fe^3+ reduced? If so, what metal(s) acted as reducing agents?
Answer:
54.09
Explanation:
How many protons, neutrons and electrons are there in a neutral atom of the isotope represented by: ^79_35 Br protons: neutrons: electrons:
A neutral atom of the isotope represented by ^79_35 Br contains protons, neutrons, and electrons:
protons=35
neutrons=44
electrons=34
What is isotope?Isotopes are two or more different atom types that have the same atomic number and position in the periodic table but different nucleon numbers due to the number of neutrons in their nuclei. Atoms that have different numbers of neutrons but the same number of protons are called isotopes. Despite having nearly identical chemical properties, their different masses have an impact on their physical characteristics. Atoms that belong to the same element and have the same atomic number Z but a different mass number A are known as isotopes. Carbon-12, carbon-13, and carbon-14 are three isotopes of the element with respective masses of 12, 13, and 14.
Here,
The number of protons = 35
The number of neutrons =79-35=44
The number of electrons = 35-1 =34
The protons, neutrons and electrons are there in a neutral atom of the isotope represented by ^79_35 Br:
protons=35
neutrons=44
electrons=34
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question what would happen if the kinetic energy of the reactants was not enough to provide the needed activation energy? responses
If the kinetic energy of the reactants was not enough to provide the needed activation energy then:
Reaction products would reform.
The rate of the response would probably quicken.
The products would develop in an energetically unstable condition.
The complex that had been activated would change into products.
A lower energy state would be used to generate the products.
What is the meant by activation energy?
The least amount of energy necessary to bring atoms or molecules into a state where they may undergo chemical transformation or physical transport is known as the activation energy in chemistry. The difference in energy content between atoms or molecules in an activated or transition-state configuration and the same atoms and molecules in their original configuration is known as the activation energy in transition-state theory.
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