The first-order rate constant for the thermal decomposition of phosphine can be calculated using the relationship between the half-life and the rate constant, resulting in a rate constant of 0.0198 s⁻¹.
The thermal decomposition of phosphine (PH₃) into phosphorus and molecular hydrogen is given as a first-order reaction, and the provided half-life of the reaction is 35.0 seconds at 680°C. To calculate the first-order rate constant for the reaction, we can use the relationship that for a first-order reaction, the half-life (t₁/2) is related to the rate constant (k) by the equation t₁/2 = ln(2) / k. Therefore, we can rearrange this formula to solve for k: k = ln(2) / t₁/2.
By plugging the values into the formula, we can calculate the rate constant as follows:
k = ln(2) / 35.0 s
k = 0.0198 s⁻¹
This is the rate constant for the first-order thermal decomposition of phosphine at the specified temperature.
The most stable conformation of 1,2-dibromoethane is:
What does it mean for a solution to be saturated
A. No more solute can be dissolved
B. The Concentration can be increased
C. No more solvent can be dissolved
D. The Solution can dissolve more substances
select the one that most likely has the highest rate of effusion Oxygen (O2) or hydrogen (H2):
The answer is hydrogen (H2) because i just answered this question from Edgenuit.
When shopping for major appliances, people should look for high energy-rating numbers because those items _____.
Answer:
Use less energy.
Explanation:
Hello,
High energy consumption implies higher costs during the usage of a product, nevertheless, by avoiding this factor, money could be saved in addition of the environmental damage that is prevented in the light of the lower energy use.
Best regards.
Complete the sentence to explain when waves interact.
Waves interact with _____ and other _______ .
The answer is: Waves interact with objects and other waves.
There are many types of waves, with different energy and interactions witt.
In order from highest to lowest energy: gamma rays, X-rays, ultraviolet radiation, visible light, infrared radiation, and radio waves.
For example, ultraviolet wave is a type of electromagnetic radiation.
Ultraviolet has shorter waves and higher energy than violet, it lies between visible light and X-rays on the electromagnetic spectrum.
Ultraviolet radiation oscillates at rates between about 800 terahertz (THz) and 30000 THz.
To effectively stop both beta particles and gamma waves, scientists use a chamber composed of lead (Pb).
Answer:
objects and waves
Explanation:
Write a balanced chemical equation for the reaction of acetone (c3h6o) with oxygen (o2) to form carbon dioxide (co2) and water (h2o). select one:
a. c3h6o + 4 o2 ® 3 co2 + 3 h2o.
b. 3 co2 + 3 h2o ® c3h6o + 4 o2.
c. 6 c3h6o + 8 o2 ® 6 co2 + 6 h2o.
d. c3h6o + o2 ® co2 + h2o.
The balanced chemical equation for the reaction of acetone (C3H6O) with oxygen (O2) to form carbon dioxide (CO2) and water (H2O) is C3H6O + 4 O2 → 3 CO2 + 3 H2O (option a). It preserves mass and element conservation.
The balanced chemical equation for the reaction of acetone (C3H6O) with oxygen (O2) to form carbon dioxide (CO2) and water (H2O) is:
a. C3H6O + 4 O2 → 3 CO2 + 3 H2O.
In this balanced equation, the number of carbon atoms, hydrogen atoms, and oxygen atoms on both sides is the same, ensuring that mass and element conservation are maintained.
Explanation:
- On the left side (reactants), there is one molecule of acetone (C3H6O) and four molecules of oxygen (O2).
- On the right side (products), there are three molecules of carbon dioxide (3 CO2) and three molecules of water (3 H2O).
This equation satisfies the law of conservation of mass and the law of conservation of elements because the number of each type of atom (carbon, hydrogen, and oxygen) remains the same on both sides of the equation. Option (a) is the correct balanced chemical equation for this reaction.
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The R-COOH compound behaves as an _____. acid base alcohol ester
Answer: Option (a) is the correct answer.
Explanation:
An organic compound that contains "-COOH" as the function group is known as carboxylic compound.
A carboxylic compound is an acid as it dissociates to give hydrogen ion.
[tex]R-COOH \rightarrow R-COO^{-} + H^{+}[/tex]
Whereas a compound with functional group "-OH" is known as alcohol.
And, a compound with general formula RCOOR' is known as an ester.
Thus, we can conclude that the R-COOH compound behaves as an acid.
What type of change does electron have?
A carbon sink is a location that stores carbon for a long period of time. What are two carbon sinks that remove carbon from the atmosphere?
Plants, the ocean, and soil serve as the primary natural carbon sinks. A portion of the carbon dioxide that plants absorb from the environment to use in photosynthesis is transferred to the soil as plants disintegrate and die.
What is carbon sinks?Anything—natural or artificial—that gathers and stores a carbon-containing chemical compound over an extended period of time eliminates carbon dioxide from the atmosphere.
The ocean and vegetation are the two most significant carbon sinks on a global scale.
Typically, forests act as carbon sinks, absorbing more carbon than they emit. Through photosynthesis, they remove carbon from the atmosphere on a constant basis.
Another example of a carbon sink is the ocean, which takes in a lot of carbon dioxide from the atmosphere.
Therefore, the ocean, plants, and soil serve as the primary natural carbon sinks.
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1. At approximately 50°C and 0.5 kPa, what phase of matter is water in? *
A. Solid
B. liquid
C. vapor
D. both liquid and vapor
2. A sample of neon occupies a volume of 375 mL at STP. What will be the volume of the neon if the pressure is reduced to 90.0 kPa? *
A.422 mL
B.422 L
C. 333 mL
D. 333 L
3. A gas at 155 kPa and standard temperature has an initial volume of 1.00 L. The pressure of the gas rises to 500 kPa as the temperature also rises to 135°C. What is the new volume? *
A. 2.16 L
B. 0.463 L
C. 0.207 L
D. 4.82 L
4. What pressure will be exerted by 0.650 mol of a gas at 30.0°C if it is contained in a 0.700 L vessel? *
A. 2340 kPa
B. 2340 atm
C. 231 kPa
D. 231 atm
5. The vapor pressure of water is *
a. high due to very weak intermolecular attractions
b. high due to water's polarity
c. low due to water's high specific heat
d. low due to relatively strong intermolecular attractions
6. Which mixture contains the largest particles? *
a. solution
b. suspension
c. colloid
d. emulsion
7. How does evaporation of a liquid differ from boiling a liquid?
8. Describe the Tyndall Effect and how it could affect my drive home on a foggy night.
Differentiated animal cells and tissues include _____.
cuboidal cells
columnar cells
bone cells
fat cells
neurons
all of the above
Because the rock is irregularly shaped, you used the (______) method to measure its volume. A. Addition B. Direct C. Displacement
Answer:
Displacement
Explanation:
how many molecules of h2o are equal to 97.2 g h2o
Answer:
3.25*10^24
Explanation:
In which range of time do earthquakes occur? A. seconds B. days C. months D. millions of years
If this reaction produced 19.6 g of kcl, how much o2 was produced (in grams)?
Imagine a solution of two liquids that are so similar that their interactions together are the same as in the individual liquids. will this solution deviate positively from, deviate negatively from, or ideally follow raoult's law?
PLEASE HELP ME BABES AND ASAP PLEASE!!
What special structures are needed for green plants?
A.chloroplasts and chlorophyll
B. stems and roots
C. cotyledon and embryo
D. flowers and spores
What happens during the light reaction of photosynthesis?
A.Water molecules combine to make food.
B.Air and water create energy for a plant.
C.Carbon dioxide is combined with glucose.
D. Water molecules split apart.
Answer as many as you can please, 40 POINTS
(Only right answers please don't guess)
1. At approximately 50°C and 0.5 kPa, what phase of matter is water in? *
A. Solid
B. liquid
C. vapor
D. both liquid and vapor
2. A sample of neon occupies a volume of 375 mL at STP. What will be the volume of the neon if the pressure is reduced to 90.0 kPa? *
A.422 mL
B.422 L
C. 333 mL
D. 333 L
3. A gas at 155 kPa and standard temperature has an initial volume of 1.00 L. The pressure of the gas rises to 500 kPa as the temperature also rises to 135°C. What is the new volume? *
A. 2.16 L
B. 0.463 L
C. 0.207 L
D. 4.82 L
4. What pressure will be exerted by 0.650 mol of a gas at 30.0°C if it is contained in a 0.700 L vessel? *
A. 2340 kPa
B. 2340 atm
C. 231 kPa
D. 231 atm
5. The vapor pressure of water is *
a. high due to very weak intermolecular attractions
b. high due to water's polarity
c. low due to water's high specific heat
d. low due to relatively strong intermolecular attractions
6. Which mixture contains the largest particles? *
a. solution
b. suspension
c. colloid
d. emulsion
7. How does evaporation of a liquid differ from boiling a liquid?
8. Describe the Tyndall Effect and how it could affect my drive home on a foggy night.
HELP!!!! 15 pts !!! Which chemical equation below does not illustrate the Law of Conservation of Mass? Al4C3 + 3H2O yields CH4 + 4Al(OH)3 2 NaCl + CaO yields Na2O + CaCl2 3 LiOH + Fe(NO3)3 yields 3LiNO3 + Fe(OH)3 Zn + 2HCl yields ZnCl2 + H2
The ka of benzoic acid is 6.4 x 10–5. what is the approximate ph of a 1.5 m solution of benzoic acid?
Answer: 2.01
Explanation:
[tex]C_6H_5COOH\rightleftharpoons C_6H_5COO^-+H^+[/tex]
initial : c 0 0
eqm: [tex]c(1-\alpha)[/tex] [tex]c\alpha[/tex] [tex]c\alpha[/tex]
[tex]K_a=\frac{c\alpha\times c\alpha}{c(1-\alpha)}[/tex]
when [tex]\alpha[/tex] is very very small the, the expression will be,
[tex]k_a=\frac{c^2\alpha^2}{c}=c\alpha^2\\\\\alpha=\sqrt{\frac{k_a}{c}}[/tex]
And,
[tex][H^+]=c\alpha[/tex]
Thus the expression will be,
[tex][H^+]=\sqrt{k_a\times c}[/tex]
Now put all the given values in this expression, we get
[tex][H^+]=\sqrt{(6.4\times 10^{-5})\times 1.5}[/tex]
[tex][H^+]=9.7\times 10^{-3}M[/tex]
[tex]pH=-log[H^+][/tex]
[tex]pH=-log[9.7\times 10^{-3}]=2.01[/tex]
The wittig reaction involves coupling between a phosphonium ylide and a carbonyl-containing molecule. if a chemist wants to use the wittig reaction to synthesize 2-methyl-2-pentene, which reactants should be used?
In the Wittig reaction to synthesize 2-methyl-2-pentene, a phosphonium ylide and a carbonyl-containing molecule, such as an aldehyde or a ketone, are needed as reactants.
Explanation:The reactants needed for the Wittig reaction to synthesize 2-methyl-2-pentene are a phosphonium ylide and a carbonyl-containing molecule. In this case, the carbonyl-containing molecule should be an aldehyde or a ketone. The phosphonium ylide is usually generated from a phosphine and an alkyl halide. For example, one possible combination of reactants could be triphenylphosphine and methyl iodide to form the phosphonium ylide, which can then react with an aldehyde or ketone to produce 2-methyl-2-pentene.
I NEED HELP, HELP ME PLZ!!!
What is the pressure in atmospheres if 1360.0g of N2O gas is compressed in a 25.0L cylinder and is stored in an outdoor shed where the temperature can reach 59.0°C in the summer?
Final answer:
pressure of 34.19 atmospheres.
Explanation:
To find the pressure in atmospheres of 1360.0g of N2O gas compressed in a 25.0L cylinder at 59.0°C, use the Ideal Gas Law PV = nRT, where:
P is the pressure we want to find, V is the volume of the gas (25.0L),n is the number of moles of N2O,R is the ideal gas constant (0.0821 L·atm/K·mol),T is the temperature in Kelvin (59.0°C + 273.15 = 332.15 K).First, calculate the moles of N2O:
Molecular mass of N2O = (14.0×2) + 16.0 = 44.0g/mol
Moles of N2O = 1360.0g / 44.0g/mol = 30.91mol
Then, substitute the values into the Ideal Gas Law and solve for P:
P = (nRT)/V = (30.91mol × 0.0821 L·atm/K·mol × 332.15 K) / 25.0L = 34.19 atm
After you preform your experiment, you determine that the kf value for naphthalene is 6.91 °c/m . you are using 10g of naphthalene and added 1.0 g of your unknown. the the freezing point of the solvent decreased by 4.47 °c when the unknown was added. knowing this information, determine the molar mass of the unknown. g/mol
Based on the Kf value and mass of the solvent naphthalene, the molar mass of the unknown compound is 154.58 g/mol.
What is the molar mass of a substance?The molar mass of a substance is the mass of one mole of that substance.
The molar mass of a substance can be calculated from the Kf value and mass of the solvent naphthalene as follows:
mass of naphthalene = 10 g or 0.01 kg.
mass of unknown compound = 1.00 g
ΔT of the solution = 4,47 °C.
Kf value of naphthalene = 6.91°C/m;
Molar mass of unknown compound = Kf(naphthalene) × mass of unknown compound/ mass of naphthalene × ΔTMolar mass of the unknown compound = 6.91°C/m · 1 g ÷ 0.01 kg × 4,47°C.
Molar mass of the unknown compound = 154.58 g/mol.
Therefore, the molar mass of the unknown compound is 154.58 g/mol.
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Which of the following is an example of how science can solve social problems? It can stop excessive rain from occurring. It can identify the sources of polluted water. It can control the time and day when cyclones happen. It can reduce the frequency of severe weather conditions.
Answer: It can identify the sources of polluted water.
Scientific innovations and researches have been proved to be beneficial in solving the day to day social problems such as household practices such as cooking, washing of cloth, industrialization and conservation of the environment.
It can identify the sources of polluted water is the correct example of how science can solve social problems. The source of pollution can be identified by tracing back it's origin and application of filters and purifiers can help in controlling the pollution.
An example of how science can solve social problems is : ( B ) It can Identify the sources of polluted water
Scientific innovationsSeveral scientific innovations have made the identification and resolution of certain problems easier and one of such is the ability to Identify the dangers and sources of pollution.
Certain natural conditions such as excessive rain, cyclones and severe weather conditions can be identified but not stopped because they occur naturally.
Hence an example of how science can solve social problems is It can identify the sources of polluted water.
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The identity of a carbonyl-containing compound has been narrowed down to three possibilities: acetamide (ethanamide), acetone (propanone), or 1,1,1-trichloropropanone. 1h nmr and ir spectral data for the compound are given below. determine the structure, and thus the identity, of the compound that gives the observed data.
Choose the solvent below that would show the greatest freezing point lowering when used to make a 0.20 m nonelectrolyte solution.
Match the element or group to the rule assigning its oxidation state.
(1.5 points) A. Oxygen B. Hydrogen C. Lone elements and atoms in gases D. Elements with multiple oxidation states E. Elements in groups 1, 2, and 17 and polyatomic ions
_____ 0
_____ Ionic charge
_____ +1, – 1 if bonded to a diatomic metal
_____ Almost always –2
_____ Determined by other elements in the compound
C. Lone elements and atoms in gases : 0
Elements in the free elemental have an oxidation number of zero
E. Elements in groups 1, 2, and 17 and polyatomic ions : Ionic charge
Group 1, 2, and 17 ions are formed by the alkali metals, alkaline metals and halogens respectively. Alkali metals, alkaline metals and halogens form +1, +2 and -1 ions respectively. Polyatiomic ions have -1, -2, -3 charges such as OH-, CO32-, PO43- respectively.
B. Hydrogen : +1, – 1 if bonded to a diatomic metal
H has an oxidation number of +1. H in metal hydrides such as NaH (sodium hydride) has an oxidation number of -1
A. Oxygen : Almost always –2
O has an oxidation number of -2.
D. Elements with multiple oxidation states : Determined by other elements in the compound
V (vanadium) has different oxidation which depends on the compound in which V is found.
look at the thing attached
Part a draw the major organic product formed when the compound shown below undergoes a reaction with an excess of etoh under acidic conditions.
Propanal undergoes nucleophilic addition with excess ethanol under acidic conditions, forming ethyl propanoate (ethyl propionate) and water through esterification.
Let's go into more detail about the reaction between propanal [tex](\(CH_3CH_2CHO\))[/tex] and ethanol [tex](\(EtOH\))[/tex] under acidic conditions.
1. Nucleophilic Addition of Ethanol:
- In the presence of an acid catalyst, such as sulfuric acid [tex](\(H_2SO_4\))[/tex], the carbonyl group of propanal undergoes nucleophilic addition with ethanol.
- The oxygen in the carbonyl group acts as a nucleophile attacking the partially positive carbon of the carbonyl carbon.
[tex]\[ \ce{CH3CH2CHO + EtOH} \xrightarrow{acid} \ce{CH3CH2COOCH2CH3} \][/tex]
2. Formation of Hemiacetal:
- Initially, a hemiacetal is formed, which involves the addition of one molecule of ethanol to the carbonyl group.
[tex]\[ \ce{CH3CH2CHO + EtOH} \xrightarrow{acid} \ce{CH3CH(OH)CH2COOCH2CH3} \][/tex]
3. Formation of Acetal (Ester):
- The hemiacetal formed can undergo another nucleophilic addition with a second molecule of ethanol, leading to the formation of the acetal (ester) and regeneration of the acid catalyst.
[tex]\[ \ce{CH3CH(OH)CH2COOCH2CH3} \xrightarrow{acid} \ce{CH3CH2COOCH2CH3 + H2O} \][/tex]
4. Overall Reaction:
- The overall reaction involves the addition of two molecules of ethanol to propanal, resulting in the formation of ethyl propanoate (ethyl propionate) and water.
[tex]\[ \ce{CH3CH2CHO + 2 EtOH} \xrightarrow{acid} \ce{CH3CH2COOCH2CH3 + H2O} \][/tex]
The ethyl propanoate formed is an ester, and this reaction is an example of an esterification reaction under acidic conditions. It's important to note that excess ethanol is used to drive the reaction to completion, and the acidic conditions help in the protonation and activation of the carbonyl group for nucleophilic attack by ethanol.
Complete Question
which rock future is the line running between points A and B most likely to be?
A)
rock
B)
strata still
C)
dice
D)
fault
Answer:
On plato this would be D a fault line
Explanation: