Answer:
Answer: e) A pH = 10.00 buffer solution
The rate constant for the first order transformation of cyclopropane to propene is 5.40 x 10-2/hr. What is the half-life of this reaction? What fraction of the cyclopropane remains after 51.2 hours? What fraction remains after 18.0 hours? Question: The rate constant for the first order transformation of cyclopropane to propene is 5.40 x 10-2/hr. What is the half-life of this reaction? What fraction of the cyclopropane remains after 51.2 hours?
To solve this type of question we must know the concept of rate law for first order kinetics and first law related to this. Therefore, the half-life of the given compound is 12.8hr.
What is the expression for rate law for first order kinetics?There are two kinds of rate law in chemical kinetics one is differential rate law and other is integrated rate law.
The expression for half life for first order reaction is
[tex]t_{1/2} = \frac{0.693}{K}[/tex]
k= rate constant= 5.40×10⁻²/hr
Substituting all the given values in the above equation, we get
[tex]t_{1/2} = \frac{0.693}{ 5.40 *10^{-2}}[/tex]
On solving this, we get
half life =0.128×10²=12.8hr
Therefore, the half-life of the given compound is 12.8hr.
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What mass of CO2 will be produced when 25.0 g of C8H18 react completely in the following equation? C8H18 + 25 O2 --> 16 CO2 + 18 H2O
The mass of [tex]CO_2[/tex] that will be produced when 25.0 g of [tex]C_8H_{18[/tex] reacts completely in the equation would be 154.035 g.
Stoichiometric problemFrom the balanced equation of the reaction which goes thus:
[tex]C_8H_{18} + 25 O_2 -- > 16 CO_2 + 18 H_2O[/tex]
The mole ratio of [tex]C_8H_{18[/tex] that reacts and the [tex]CO_2[/tex] that is produced is 1:16.
Recall that: mole = mass/molar mass
The molar mass of [tex]C_8H_{18[/tex] is 114.23 g/mol
Mole of 25.0 g [tex]C_8H_{18[/tex] = 25/114.23
= 0.22 mol
Since the mole ratio is 1:16, the moles of [tex]CO_2[/tex] that will be produced by 0.22 mol of [tex]C_8H_{18[/tex] would be:
0.22 x 16 = 3.50 mol
The molar mass of [tex]CO_2[/tex] is 44.01 g/mol, thus, the mass of 3.50 mol of the gas can be determined as:
Mass = mole x molar mass
= 3.5 x 44.01
= 154.035 g
In other words, the mass of [tex]CO_2[/tex] that will be produced when 25.0 g of [tex]C_8H_{18[/tex] reacts completely in the equation would be 154.035 g.
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A sample of nitrogen dioxide gas occupies 625 cm3 at 70.0 °C and 15.0 psi. What is the final Celsius temperature if the volume is 545 cm3 at 15.0 psi?
The final temperature of the sample of nitrogen dioxide gas that occupies 625 cm³ at 70.0 °C and 15.0 psi is 299.12K.
How to calculate temperature?The temperature of a gas can be calculated by using the combined gas law formula as follows:
P₁V₁/T₁ = P₂V₂/T₂
Where;
P₁ = initial pressureV₁ = initial volumeT₁ = initial temperatureP₂ = final pressureV₂ = final volumeT₂ = final temperatureAccording to this question, a sample of nitrogen dioxide gas occupies 625cm³ at 70.0 °C and 15.0 psi. The final temperature can be calculated as follows:
15 × 625/343 = 15 × 545/T
27.33T = 8175
T = 299.12K
Therefore, 299.12K is the final temperature of the sample of nitrogen dioxide gas.
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4. Which of the following properties of fluorine is a physical property?
A.Fluorine gas is flammable.
B.All metals corrode in the presence of fluorine.
C.Fluorine gas is poisonous.
D.The liquid phase of fluorine is pale yellow.
Answer:
A
Explanation:
Fluorine is a REACTIVE nonflammable gas or liquid which will enhance combustion of other materials.
Complete the table. Then explain how wavelength and frequency are mathematically related.
The wavelength is same.
What is wavelength?
Wavelength can be defined as the distance between two successive by throughs of a wave.
The question wants you to determine the energy that is the incoming photon by the must have in order to the accept the electron that melted it tob the jump to 2 to 1.
A good starting point here will be to calculate the energy of to the photon emitted when the electron falls from 1 to 2
by applying the Rydberg equation.
1/π = R
λ
si the wavelength of the emittted photon R
is the Rydberg constant, equal to 1.907.
This means that you haveλ=
4.10
So, you know that when an electron falls from the
to
a photon of wavelength by the
410 nm
is emitted. This implies by that in order to the for the electron by jump to the 2 to 1 .
it must absorb a photon of the same wavelength.
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The following image shows a man running with a training parachute. The man is pushing himself forward with a force of 30 newtons. The net force on the man is 10 newtons forward. What is the parachute doing?
It is pushing the man forward with 10 newtons of force.
It is reducing the force by increasing the runner's mass.
It is making the runner travel at a constant speed.
It is pulling the man backward with 20 newtons of force.****
The net force on the man is 10 newtons forward. The parachute is pushing the man forward with 10 newtons of force. Therefore, option A is correct.
What is net force ?The vector sum of the forces exerted on a particle or object is known as the net force. The original forces' impact on the motion of the particle is replaced by the net force, which is a single force.
In accordance with Newton's second rule of motion, it causes the particle to accelerate at a rate equal to the sum of all those actual forces.
The vector sum of all forces exerted on an object is known as the net force. The net force acting on an object is zero when it is in equilibrium, whether it is at rest or moving at a constant speed. Only when all of a vector's components are zero can a vector have a magnitude of zero.
Thus, option A is correct.
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Answer: A
Explanation:
(e) What type of reaction takes place when zinc reacts with copper oxide? Tick one box. Combustion
Crystallisation
Displacement
Neutralisation oxide
To solve such this we must know the concept of displacement reaction. Therefore, the correct option is option C that is displacement reaction.
What is chemical reaction?Chemical reaction is a process in which two or more than two molecules collide in right orientation and energy to form a new chemical compound. The mass of the overall reaction should be conserved. There are so many types of chemical reaction reaction like combination reaction, double displacement reaction.
when zinc reacts with copper oxide then zinc displace copper from copper oxide as zinc is more reactive than copper on the reactivity series. So, copper is displaced by zinc.
Therefore, the correct option is option C that is displacement reaction.
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a) Are Albumin compact, globular proteins?
[tex]{ \blue{ \sf{Albumin}}}[/tex] is a soluble and globular monomeric protein encoded by chromosome 4 that comprises about half of the protein found in blood serum. It functions as a carrier protein for steroids, fatty acids, and thyroid hormones as well as stabilizing extracellular fluid volume.
By what factor would the average kinetic energy of the particles be increased if the
temperature a substance was increased from -49C to 287C?
Average kinetic energy is the average sum of all kinetic energy of all the molecules of gases. Therefore, the new kinetic energy is 48 times the original kinetic energy.
What is kinetic energy?
It is a energy which is possess by a moving object. It is very difficult to find the correct value of kinetic energy so we find average kinetic energy. Which is very easy to calculate as compared to calculating kinetic energy
Average kinetic energy is directly proportional to temperature. It is not dependent on the type of gases or mass of gases
Mathematically,
K.E=2/3KT
Where,
K= Boltzmann constant
T is the temperature
Gases at higher temperature will have higher average kinetic energy. For every 10 degree rise in temperature, kinetic energy of reaction gets double. There are 24 times 10 between the given temperature -49C to 287C. So, the new kinetic energy is 48 times the original kinetic energy.
Therefore, the new kinetic energy is 48 times the original kinetic energy.
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According to molecular orbital theory, which species in the following list are paramagnetic: H2+, C22–, and N22–?
A. H2+ and N22-
B. H2+, C22-, and N22-
C. H2+ and C22-
D. C22-, and N22-
E. H2+ only
If the density of an ideal gas at STP is found to be 0.716 g/L, what is its molar mass?
Answer:
GL
Explanation:
between ethane, ethene and ethyne which is having shortest bond?
As you can see the picture, in the three given compounds i.e. ethane, ethene and ethyne, ethyne have shortest bond. Bond length of ethyne is very short when compared to the ethane and ethene. Shorter the bond, bond strength will be more. Hence, our answer is ethyne.
Answer:
ethyne has shortest bond
Define inference and explain how it is used to form conclusions.
Answer:
an inference is an educated answer based on a piece of information you have been given
Explanation:
e.g. they had pigtails in their long blonde hair.
from this we can infer that I am speaking about a girl
If 0.050 mol hydrochloric acid (HCl) is mixed with 0.050 mol of sodium hydroxide (NaOH) in a "coffee cup" calorimeter, calculate the temperature change of 47.0 g of the resulting solution if the specific heat of the solution is 1.00 cal/g·°C and the quantity of heat released by the reaction is 8.8 × 102 cal.
The temperature change of the resulting solution, given that the soluton has a specific heat of 1 cal/g·°C is 18.7 °C
How do I determine the temperature change?We know that heat released is related to change in temperature according to the following formula:
Q = MCΔT
Where
Q is heatM is the mass C is the specific heat capacityΔT is the temperature change
Using the above formula, the temperature change of the solution can be obtained as follow:
Mass of solution (M) = 47.0 gSpecific heat capacity of silver (C) = 1.00 Cal/g·°CHeat released (Q) = -8.8×10² CalTemperature change (ΔT) = ?Q = MCΔT
-8.8×10² = 47 × 1 × ΔT
-8.8×10² = 47 × ΔT
Divide both side by 47
ΔT = -8.8×10² / 47
ΔT = -18.7 °C
Thus, the temperature change is 18.7 °C
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You make a stock solution using 17.26 mg of a dye with a molar mass of 225.8 g/mol and you add water until you reach a volume of 500.0 mL. What is the concentration of the dye in the stock solution? Give your answer in all of the units requested (M, mM)
Answer:
Molar mass of dye = 225.8 g/mol
Mass of dye = 17.26 mg
Volume of stock solution = 500.0 mL
Concentration of dye (M) = (17.26 mg/225.8 g/mol) / (500.0 mL/1000 L) = 0.000769 M
Concentration of dye (mM) = 0.769 mM
According to the molar concentration, the concentration of the dye in the stock solution is 15.04×10⁻³M and 15.04×10⁻⁶mM.
What is molar concentration?Molar concentration is defined as a measure by which concentration of chemical substances present in a solution are determined. It is defined in particular reference to solute concentration in a solution . Most commonly used unit for molar concentration is moles/liter.
The molar concentration depends on change in volume of the solution which is mainly due to thermal expansion. Molar concentration is calculated by the formula, molar concentration=mass/ molar mass ×1/volume of solution in liters.
In terms of moles, it's formula is given as molar concentration= number of moles /volume of solution in liters.
Substitution of values in formula gives, M= 0.017/225.8×1/0.5=15.04×10⁻³ M or 15.04×10⁻⁶ mM.
Thus, the concentration of the dye in the stock solution is 15.04×10⁻³M and 15.04×10⁻⁶mM.
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A gas mixture was prepared to contain 50% by mass of O, and Ne. When the total pressure of the mixture is 1.50 atm, what is the partial pressure of O₂?
The partial pressure of oxygen is the product of its mole fraction and the total pressure. Partial pressure of O₂ here, is 0.82 atm.
What is partial pressure?Partial pressure of an individual gas in a mixture of gases is its contribution to the total pressure of the gas mixture. According to Dalton's law of partial pressures, the total pressure of the mixture is the sum of partial pressures of the individual gases.
The partial pressure of the individual gases will be the product of the mole fraction and total pressure.
mass of oxygen = 16 g/mol
number of moles in 50 g = 50 /16 = 3.125 moles.
mass of neon = 20 g/mol
moles in 50 g = 50 / 20 = 2.5 moles.
Mole fraction of oxygen = 3.125/ (3.125 + 2.5) = 0.55.
Partial pressure = mole fraction × total pressure
= 0.55 × 1.50 atm = 0.82 atm.
Therefore, the partial pressure of O₂ in the mixture is 0.82 atm.
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In a triple bond, three pairs of electrons are shared between two atoms. Based on this information, draw the hydrogen atoms so that each carbon atom has four bonds. Then record the number of hydrogen atoms you drew using a text box.
sorry it's not clear anyway hope you can see the H and C .. the hydrogen atoms are 8
What is the pH of an aqueous solution with a hydrogen ion concentration of [H+]=7.7×10−4 M?
Answer:
What is the pH of an aqueous solution with a hydrogen ion concentration of [H+]=7.7×10−4 M?
The pH of an aqueous solution with a hydrogen ion concentration of [H+]=7.7×10−4 M is 3.11.
How many moles of lithium metal react to yield 5.00 mol of hydrogen
gas?
_Li(s) + H₂O(0)→ _LiOH(aq) + _H₂(g)
O none of the above
O 20.0 mol
O 2.50 mol
O 10.0 mol
O 5.00 mol
According to stoichiometry and balanced chemical equation 10 moles of lithium metal react to yield 5.00 mole of hydrogen gas.
What is stoichiometry?Stoichiometry is the determination of proportions of elements or compounds in a chemical reaction. The related relations are based on law of conservation of mass and law of combining weights and volumes.
Stoichiometry is used in quantitative analysis for measuring concentrations of substances present in the sample.
In the balanced chemical equation as 2 moles of lithium produce 1 mole of hydrogen.
∴for 5 moles of hydrogen to be liberated,5×2/1=10 moles of lithium are required.
Thus, 10 moles of lithium are required to react to yield 5 moles of hydrogen gas.
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Use the bond energies in the table to estimate the enthalpy of reaction for the formation of sulfur tetrafluoride monoxide.
The enthalpy of reaction for the formation of sulfur tetrafluoride monoxide is 16 kJ/mol.
What is the enthalpy of a reaction?The enthalpy of a reaction measures the sum total of the heat that is absorbed or liberated in a given reaction when reactants react to form products.
The enthalpy change of a reaction can be calculated using the formula given below:
Enthalpy of reaction = sum of bond energies of the products - sum of bond energies of the reactantsThe equation of the given reaction is as follows:
SF₄ + ¹/₂ O₂-----> SF₄O
Enthalpy of reaction = (4 * S-F + S-O) - (4 * S-F + ¹/₂ * O-O)
Enthalpy of reaction = (4 * 310 + 265) - (4 * 310 + /₂ * 498)
Enthalpy of reaction = 16 kJ/mol
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Calculate the kinetic energy of a 150 g baseball moving at a speed of 36. m/s (81 mph).
Answer:
KE=1\2mv2
KE=0.5 *0.15*(36)2
97.2j
Calculate the standard enthalpy change for the reaction
2A+B⇌2C+2D
Use the following data:
Substance ΔH∘f
( kJ/mol)
A -231
B -409
C 177
D -515
Express your answer to three significant figures and include the appropriate units.
The standard enthalpy change for the reaction 2A + B ⇌ 2C + 2D is 195 kJ/mol.
What is the enthalpy of a reaction?The enthalpy of a reaction is a measure of the heat changes that occur when reactants form a product in a given reaction.
The enthalpy change of a reaction can be calculated using the formula given below:
Enthalpy of reaction = sum of enthalpies of the products - sum of enthalpies of the reactants
Considering the given reaction: 2A + B ⇌ 2C + 2D
Enthalpy of reaction = (2 * C + 2 * D) - (2 * A + B)
Enthalpy of reaction = {[2 * 177 + 2 * (-515)] - [2 * (-231) + (-409)]}
Enthalpy of reaction = 195 kJ/mol
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When heated, calcium carbonate, CaCO3(s) , decomposes to calcium oxide, CaO(s) , and carbon dioxide, CO2 . Using relevant data from your book's appendices, calculate the heat evolved or consumed when 15.0 g of calcium carbonate are decomposed. answer: kJ
As per the standard data, the heat evolved during one mole of calcium carbonate decomposes is 177.8 KJ. Thus 15 g or 0.15 moles of calcium carbonate when decomposed will produce 26.67 KJ of heat.
What is reaction enthalpy?Reaction enthalpy of a substance is the heat evolved or absorbed during a reaction. Reaction enthalpy is negative for an exothermic reaction and positive for an endothermic reaction.
Molar mass of calcium carbonate = 100 g.
no.of moles in 15 g = 15 /100 = 0.15 moles.
One mole or 100 g of calcium carbonate decompose to evolve 177.8 KJ according to the scientific record.
Thus, heat evolved by the decomposition of 0.15 moles is 0.15 × 177.8 KJ = 26.67 KJ.
Hence, the heat evolved during the decomposition of 15 g of calcium carbonate is 26.67 KJ.
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This hydrocarbon is incomplete. Draw the hydrogen atoms and the bonds connecting them to carbon atoms such that each carbon atom has four bonds. Then record the number of hydrogen atoms you drew using a text box.
Answer:
H/Hydrogen atoms = 12
reason:
no. of carbon=5
so it'll be C5H12
Consider these questions about living with nuclear power, and then answer them.
1. Would you live near a nuclear power plant? Explain your response.
2. What kinds of jobs are available at a nuclear power plant?
3. Identify the benefits and risks to someone who is working at a nuclear power plant.
4. How does the presence of a nuclear power plant impact the economy of local communities and the lives of people living nearby?
5. What do you think are some reactions of individuals within the communities that are close to nuclear power plants? Explain why you think they might have these reactions.
Answer:
Explanation:
1. No, I simply would not feel safe.
2. Power plant manager
3. exposure to chemicals
Use Lewis structures to determine which two of the following are unstable: (a) SF2; (b) SF3; (c) SF4; (d) SF5; (e) SF6.
According to the Lewis structures, SF₂ is unstable as it has 2 lone pairs of electrons.
What are Lewis structures?Lewis structures are also called as electron dot structures and can be drawn if the molecular formula of a compound is known. It provides information regarding the nature of bond and the position of atoms .
They are also capable of exhibiting the lone pair if any present in a molecule or compound.Lewis defined a base to be an electron pair donor and an acid to be an electron pair acceptor.
They are capable of reflecting electronic structure of elements and even the pairing of electrons . In the diagram, each dot represents an electron while a pair of dots represent a bond between the atoms.
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How many Grams of ribose (a carbohydrate) must be added to
200 mL of water to prepare a O.IM ribose solution?
Answer:
3 grams C₅H₁₀O₅
Explanation:
To find the mass of ribose needed to prepare the sample, you need to
(1) convert the volume from mL to L (1,000 mL = 1 L)
(2) calculate the number of moles (M = moles / L)
(3) convert moles to grams (using the molar mass of ribose)
The molecular formula of ribose is C₅H₁₀O₅. It is important to arrange all of the ratios/conversions in a way that allows for the cancellation of units.
(Step 1)
200 mL C₅H₁₀O₅ 1 L
---------------------------- x ---------------------- = 0.2 L C₅H₁₀O₅
1,000 mL
(Step 2)
Molarity (M) = moles / volume (L) <----- Molarity ratio
0.1 M = moles / 0.2 L <----- Insert values
0.02 = moles <----- Multiply both sides by 0.2 L
(Step 3)
Atomic Mass (C): 12.011 g/mol
Atomic Mass (H): 1.008 g/mol
Atomic Mass (O): 15.999 g/mol
Molar Mass (C₅H₁₀O₅): 5(12.011 g/mol) + 10(1.008 g/mol) + 5(15.999 g/mol) = 150.13 g/mol
0.02 moles C₅H₁₀O₅ 150.13 g
---------------------------------- x ------------------- = 3 grams C₅H₁₀O₅
1 mole
a student is performing experiments on a particular substance. which statement is a observation of a chemical property of the substance?
Answer:
a
Explanation:
bc i think it is and pls i wany to have ajebehhe
Answer:
if it burns
Explanation:
what is the name of ch3cooc2h5
Answer:
ethyl ethanoate
Explanation:
it helps you
A gas occupying 50.0 ml volume in a confined space at 20.0 dc at 50.0 kpa is heated to 40.0 dc. What is the pressure exerted by the gas in the container?
Answer:The pressure exerted by the gas is 100kPa
Explanation:Let's apply the Charles Gay Lussac law, to solve the question.
At constant volume, the pressure varies proportionally with the temperature.
P initial / T° initial = P final / T° final
50kPa / 20°C = P final / 40°C
Temperature has increased the double, so the pressure will be increased, the double too.
100 kPa
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