What is the approximate mass percent of hydrogen in propyne, C3H4?
The approximate mass percent of hydrogen in propyne 10%.
One carbon atom has mass of 12 amu (unified atomic mass). One unified atomic mass unit is approximately the mass of one nucleon (proton or neutron).
m(C) = 12 amu; mass of the carbon atom
m(H) = 1 amu; mass of the hydrogen atom
m(C₃H₄) = 3 × m(C) + 4 × m(H)
m(C₃H₄) = 3 × 12 amu + 4 × 1 amu
m(C₃H₄) = 40 amu; mass of the propyne molecule
ω(H) = 4 × m(H) ÷ m(C₃H₄) × 100%
ω(H) = 4 × 1 amu ÷ 40 amu × 100%
ω(H) = 10%; the approximate mass percent of hydrogen in propyne
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Balance the following decomposition reactions.
KCl -> K + Cl2
Ag20 -> Ag + 02
Hl -> H2 + l2
Answer:
In explanation
Explanation:
1. 2, 2, 1
2. 2, 4, 1
3. 2, 1, 1
What happened to the solid lithium when the temperature was decreased?
A. Nothing changed.
B. Its shape changed.
C. Its volume changed.
The chemical element lithium has the symbol Li and atomic number 3. A delicate, silvery-white alkali metal, it is. It is the least dense solid element and the least dense metal under typical conditions.
What happens to the solid lithium when the temperature was decreased?
"Nothing changed."
With their high energy and power densities, lithium-ion batteries (LIBs) perform well in a variety of applications. However, the effect of temperature still has an impact on LIB performance. Normal operating range for LIBs is between 20 °C and 60 °C. Outside of this range, both low and high temperatures will result in decreased performance and permanent harm, such as thermal runaway and lithium plating.
At low temperatures, the components of a lithium-ion battery are also less compatible. The "vulnerability" of lithium-ion batteries at low temperatures is due to this. If a lithium-ion battery is overworked (high current charging and discharging), the resistance will increase and the capacity will decrease even more quickly. A "cold" lithium-ion battery will operate with greater resistance (increased resistance) and less effectively (rapid reduction in actual capacity).
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How many grams of boric acid (to two decimal places) are required to make 850 ml of the the stock solution?
To prepare 1 M, 850 ml boric acid solution, 52.7 gm solute is reported.
What is stock solution?
Simply said, a stock solution is a concentrated form of the "working solution" you used to conduct your experiment. This is typically done if the more diluted working solution degrades or decomposes quickly over time.
Stock solutions are used to speed up the preparation process, save time and resources, free up space in storage, and increase the precision with which working lower concentration solutions are made. The main benefits of adopting stock solutions are that they are easier to measure and save time when manufacturing solutions.
We know that,
Molarity (M) = Moles of solute ÷ liters of solution
Let's assume to prepare 1M, 850 ml (= 0.85 liter) boric acid solution, X mole solute is required.
So, 1 = X ÷ 0.85
Or,. X = 0.85
Molecule weight of boric acid 62 gm.
So,
1 mole boric acid = 62 gm boric acid
0.85 mole boric acid = 62×0.85 gm. Boric acid
= 52.7 gm.
To prepare 1 M, 850 ml boric acid solution, 52.7 gm solute is reported.
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The density of a sample of sea water is 1.99 slug/ft^3. Determine the value of density in si and ee units, and the value of specific weight in si, bg and ee units
Density in si = 1.99 slug/ft3 = 1.99 * 515.3788 kg/m³ = 1025.60 kg/m³
Specific weight is 1025.60 kg.
What is density?
The definition of density is the mass of a substance per unit volume. The ratio of mass to volume is known as density, or mass per unit volume. It gauges how much material an object contains in relation to its volume (cubic metre or cubic centimeter). In essence, density is a measurement of how closely together matter is packed.
1 slug/ft3 = 515.3788184 kg/m3.
1 slug = 14.5939029372 kg
Thus, 1.99 slug/ft3 = 1.99 * 515.3788 kg/m³ = 1025.60 kg/m³
Specific weight is 1025.60 kg.
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The ph of a 2.33 m solution of hydrocyanic acid (hcn) is 4.420. what is the percent dissociation of hydrocyanic acid under these conditions?
The percent dissociation of hydrocyanic acid under these conditions is 11.81 %.
Balanced equation of hydrocyanicacid acid dissociation in water:
HCN(aq) → H⁺(aq) + CN⁻(aq)
pH (potential of hydrogen) is a numeric scale used to specify the acidity or basicity an aqueous solution.
pH(HCN) = 2.33
c(H⁺) = 0.467 M; concentration of hydrogen ions
c(H⁺) = c(CN⁻); from the chemical equation
c(HCN) = 4.420 M; concentration of the hydrocyanic acid
percent dissociation = (concentration of H⁺/concentration of acid) x 100%
the percent dissociation = (0.467 M / (4.420 M - 0.467 M)) × 100%
the percent dissociation = 11.81 %.
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An average person burns about 100 calories when running a mile. suppose you eat a candy bar that has 30 g of sugar (which has 4 calories/g) and 15 g of fat (which has 9 calories/g). how far do you need to run to burn it off?
Given that an average person burns about 100 calories when running a mile, after eating a candy bar, you must run 2.55 miles to burn it off.
The amount of energy in an item of food or drink is measured in calories.
If a candy bar has 30 g of sugar (which has 4 calories/g) and 15 g of fat (which has 9 calories/g), then the total calories each candy bar has is:
sugar : 30g(4 calories/g) = 120 calories
fat : 15g(9 calories/g) = 135 calories
candy bar = 120 + 135 = 255 calories
If you eat a candy bar that has 255 calories, and an average person can burn 100calories/mile running, then,
x = 255 calories/(100calories/mile)
x = 2.55 miles
where x = number of miles you need to run to burn off the calories
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Compounds that is made of ions
Is it ionic compound ?
Explanation:
Ionic compounds are compounds composed of ions held together by electrostatic force called ion bounding.
A ladder and a ramp are one analogy for quantized vs, continuous theories of energy. 'Think of another analogy to compare the two theories and draw a diagram to represent it.
Quantization means that only specific values are allowed
what are quantized and continuous theories?
If the energy levels are continuous then a particle (or system) can have any energy in that interval. If they are quantized say E1,E2..., then a particle (or system) can have only one of those energies, and not anything in between them.Quantization of energy is not a consequence of Schrödinger equation, instead it is a consequence of confinement. Energy levels in quantum systems are not always quantized. On the other hand, classical systems also exhibits quantization of the energy levels. For example, consider the allowed frequencies of a string with fixed length (confinement) like in a guitar or violin. In such string, the allowed "energy states" corresponds to frequencies (harmonics) which are multiples of a fundamental frequency (first harmonic). Energy level are quantized if wavefunction is confined in finite space. eg; atomic orbital or quantum well. Energy level in solids are continuous while in gases they are quantized.In a solid energy levels are also quantized but the difference between levels decreases as the system size increases. Thus in the thermodynamical limit (large system sizes), these quantized energy levels become a continuum of states.Thus we can conclude that quantization of energy levels appears both in quantum and classical mechanics
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Help ASAP! 50pts! Brainliest for best answer!
The length of a bond, between two atoms, is the distance between the two nuclei of the atoms that is the point of ________.
Covalent inclusion
Maximum Energy
Minimum Energy
Nuclear fission
Answer:
Covalent
Explanation:
Why do you wash the aldol condensation product crystals with 4ml acetic acid/ ethanol solution?
The aldol condensation product crystals was washed with a solution of 4% acetic acid in 95% ethanol. Because this combination eliminates the base used in the reaction, it has the ability to slow down the self-condensation process of the carbonyl compound in the aldol reaction.
The aldol reaction is accompanied by the dehydration reaction, which produces conjugated enone. It also contributes to the creation of a carbon-carbon bond. The aldol condensation reaction is an organic synthesis that accounts for the formation of?-hydroxyketone or ?-hydroxyaldehyde from the reaction of an enol or an enolate ion and a carbonyl compound.
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Predict the effect of adding a noncompetitive inhibitor to the reaction mixture on the rate of reaction at a high substrate concentration. Support your prediction by describing how a noncompetitive inhibitor affects the structure and function of an enzyme.
Only a few locations on an enzyme, with or without a substrate, can be occupied by a noncompetitive inhibitor at one time.
This is due to the fact that it alters an enzyme's conformation as well as its active site, which prevents the substrate from binding to the enzyme properly and lowers the enzyme's effectiveness.
When an inhibitor binds to an enzyme away from the active site, it changes or distorts the structure of the enzyme, which reduces the effectiveness of the active site even though the substrate can still bind. Most of the time, the inhibitor is also reversible.
Examples of non-competitive inhibition include the inhibitory effects of heavy metals, cyanide on cytochrome oxidase, and arsenate on glyceraldehyde phosphate dehydrogenase.
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What product should be obtained if benzyne is generated in the presence of 1,3-butadiene?
3-bromo-1-butene is the end product of adding 1 equivalent of HBr to 1,3-butadiene.
What is butene ?The alkene butene, often known as butylene, has the chemical formula C4H8. Any of the several chemicals may be referred to by the word "butene." They are odorless gases that are found in crude oil in trace amounts that are insufficient for practical extraction.
In the manufacturing of rubber and gasoline, 1-butene is used to create a wide range of compounds. Alkylate and polymer gasoline are used to make more than half of the butene produced worldwide. A third is utilized directly as fuel, primarily as fuel gas or blendstock for gasoline, without any conversion.
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