Answer:
D. 18,800 J/mol
Explanation:
We need to use the Arrhenius equation to solve for this problem:
[tex]k=Ae^{\frac{-E_a}{RT}[/tex], where k is the rate constant, A is the frequency factor, [tex]E_a[/tex] is the activation energy, R is the gas constant, and T is the temperature in Kelvins.
We want to find the value of [tex]E_a[/tex], so let's plug some of the information we have into the equation. The gas constant we can use here is 8.31 J/mol-K.
At 0°C, which is 0 + 273 = 273 Kelvins, the rate constant k is [tex]4.6*10^{-2}[/tex]. So:
[tex]k=Ae^{\frac{-E_a}{RT}[/tex]
[tex]4.6*10^{-2}=Ae^{\frac{-E_a}{8.31*273}[/tex]
At 20°C, which is 20 + 273 = 293 Kelvins, the rate constant k is [tex]8.1*10^{-2}[/tex]. So:
[tex]k=Ae^{\frac{-E_a}{RT}[/tex]
[tex]8.1*10^{-2}=Ae^{\frac{-E_a}{8.31*293}[/tex]
We now have two equations and two variables to solve for. We just want to find Ea, so let's write the first equation for A in terms of Ea:
[tex]4.6*10^{-2}=Ae^{\frac{-E_a}{8.31*273}[/tex]
[tex]A=\frac{4.6*10^{-2}}{e^{\frac{-E_a}{8.31*273}} }[/tex]
Plug this in for A in the second equation:
[tex]8.1*10^{-2}=Ae^{\frac{-E_a}{8.31*293}[/tex]
[tex]8.1*10^{-2}=\frac{4.6*10^{-2}}{e^{\frac{-E_a}{8.31*273}} }e^{\frac{-E_a}{8.31*293}[/tex]
After some troublesome manipulation, the answer should come down to be approximately:
Ea = 18,800 J/mol
The answer is thus D.
Use the drop-down menus to identify the type of mass movement in each image. Grass covered land with a large depressed area. Muddy water is rushing across a roadway. Dirt and fallen trees cover a roadway.
Answer: First one is slump, then mudflow, then landslide.
Explanation:
Just got it right on e2020
Answer:
First one is slump, then mudflow, then landslide.
Explanation:
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Beginning with interphase, use the letters to order the following events:
A prophase
B telophase
C metaphase
D interphase
E anaphase
Answer:
D, A, C, E, B
Interphase, Prophase, Metaphase, Anaphase, Telpohase
Identify whether each of these hydrocarbons is saturated or unsaturated. Place an "S" for "saturated" next to each hydrocarbon letter that is saturated. Place a "U" for "unsaturated" next to each hydrocarbon letter that is unsaturated.
A. 2 central carbons, with C H 3 at each end, and also single bonded to the first carbon.B. 3 central carbons, with the first 2 double bonded to each other. The left end is bonded to C H 3, and the right end is bonded to 3 C H 3.C. 2 central carbons, with H above, below, and to both sides.D. 5 central carbons, with H above and below each, and H and to both ends of the chain.
ANWSERS:
A. ⇒ S
B. ⇒ U
C. ⇒ S
D. ⇒ S
You're welcome >:D
Answer:
A = S
B = U
C = S
D = S
Explanation:
Among the given compounds, compounds (A), (C) & (D) are saturated hydrocarbons and compound (B) is an unsaturated hydrocarbon.
What is hydrocarbons?Hydrocarbons are those compounds in which carbon atom is present in addition to the hydrogen atoms.
Saturated compounds are those compounds in which only single bonds are present between two carbon atoms.Unsaturated compounds are those compounds in which double or triple bonds are present between two carbon atoms.So, according to the data given in the question it is clear that compound (A), (C) and (D) are saturated compounds as in these only single bonds are present and compound (B) is an unsaturated compound because of the presence of the double bonds.
Hence only compound (B) is an unsaturated compound.
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Un elemento posee dos isótopos cuyos números de masa suman 68 y la semisuma de sus neutrones es 19. Determine el grupo de este elemento en la Tabla Periódica Actual.
Answer:
The element belongs to group 15 of the present periodic table
Explanation:
Isotopes have the same proton number, what differs is that they have different number of neutrons.
Now since the half-sum of their neutrons is 19, the total number of neutrons would be 19 * 2 = 38 neutrons.
Also, their masses add up to be 68, since the total mass equals sum of neutrons and sum of protons, this means that the total number of protons is 68-38 = 30
Since this is equal in both isotopes, this means that the proton number of the element is 30/2 = 15
The atomic number is the number of protons in the nucleus of an atom. Since the atomic number is 15, this element is phosphorus and it belongs to group 15 of the present periodic table
can you answer this?
Mass: 108g
volume:12cm to the third power (3)
Answer:
The density is 0.0625 g/cm³
Explanation:
In order to find the density, you have to use its formula, ρ = mass/volume. Then substitute the following values into the formula :
[tex]ρ = \frac{mass}{volume} [/tex]
Let mass = 108g,
Let volume = (12³)cm³ = 1728cm³,
[tex]ρ = \frac{108}{1728} [/tex]
[tex]ρ = \frac{1}{16} [/tex]
[tex]ρ = 0.0625g / {cm}^{3} [/tex]
when two atoms of the same nonmetal react, they often form?
Answer:
a diatomic molecule
Explanation:
Water's unusual properties are primarily due to
a molecular geometry
b small molar mass
c chemical reactivity
d hydrogen bonding
Answer:
D hydrogen bonding
Explanation:
1
Identify how many Sulfur atoms are in the product of this chemical
equation *
BaSO4 + H2SO4
Ba(HSO4)2
O A. 2
O B.4
O C. 8
O D. Unknown
Answer:
2
Explanation:
Equation of reaction
BaSO₄ + H₂SO₄ → Ba(HSO₄)₂
From the above equation of reaction, it is evident that there are 2 atoms in the product side of the reaction which is only logical because every chemical reaction obey the law of conservation of mass which states that matter can neither be created nor destroyed but can changed from one form to another.
In the reactant side, we have 2 atoms of S from the two reactants coming together.
One sulfur atom from BaSO₄ and the other from H₂SO₄. So therefore, only 2 sulfur can be produced since the reaction has to observe law of conservation of matter
PLISSSSS!!! HELP ME ASAP.. NEED TO HAND IT IN TODAY
GIVING BRAINLIEST FOR THE BEST ANSWERS
Explanation:
This is for The first one. Í need some time for The second part. I'll send it by today
A leaf preserved in hard transparent material is found in:
Answer:
would be fossiled amber I think
Answer:
It would be a fossilized amber
Explanation:
After millions of tons of pressure is applied on the leaf, the carbon in the leaf is forced into a transparent like material
explain how iodine can be obtained from iodine-sodium chloride mixture
H2SO4 + 2NaOH - Na2SO4+ 2H20
In a titration, 5.0 ml of 1.0 M H2SO4 solution is neutralized by 8.0 ml of an NaOH solution of unknown
concentration. The concentration of the NaOH is -
OA 2.0 M
OB 1.0 M
OC 0.63 M
OD 1.3 M
Answer:
It takes 83 mL of a 0.45 M NaOH solution to neutralize 235 mL of an HCl ... 2). You are titrating an acid into a base to determine the concentration of the base. The endpoint of the neutralization is reached but the stopcock on the buret sticks slightly ... 5). It takes 12.5 mL of a 0.30 M HCl solution to neutralize 285 mL of NaOH ...
Explanation:
The cycling of carbon between the living and non-living parts of the Earth system is an important result of which of the following processes?
a. Herbivores digesting plant material to get nutrients
b. Plants and animals exchanging gases with the atmosphere
c. Condensation of water vapor leading to cloud formation
d. Methane entering the atmosphere from volcanic activity
Answer:
b. Plants and animals exchanging gases with the atmosphere
Explanation:
you are given element x. what should you do to identify the element.
(Sains)
1What is one major difference between fossil fuels and biofuels?
ABurning fossil fuels releases greenhouse gases; burning biofuels releases no greenhouse gases incorrect answer
B Fossil fuels exist in unlimited supply; our supply of biofuels may run out someday incorrect answer
C Fossil fuels are very expensive to manufacture; biofuels are very inexpensive to manufacture incorrect answer
D You can drive farther on a single tank of fossil fuel than you can on a single tank of biofuel
The major difference between fossil fuels and biofuels is you can drive farther on a single tank of fossil fuel than you can on a single tank of biofuel. The correct option is D.
What are fossil fuels?A fossil is a naturally extracted fuel, for example, the anaerobic decompression of buried dead animals, while biofuel is any biomass fuel, plant or algae, or animal waste. Since these materials can quickly be replenished, biofuels are considered renewable energy sources.
Biofuels are created from renewable feedstocks, unlike fossil fuels, which are finite resources. As a result, their manufacturing and use might theoretically continue forever.
Therefore, the correct option is D. You can drive farther on a single tank of fossil fuel than you can on a single tank of biofuel.
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How much energy is released when 22.4g of CH4 is burned?
The combustion of methane, CH4, releases 890.4 kJ/mol. That is, when one mole of methane is burned, 890.4 kJ are given off to the surroundings. This means that the products have 890.4 kJ less than the reactants.
Combustion of one mole or 16 g of methane gas releases 810 kJ of heat energy. Thus, heat released by the combustion of 22.4 g of methane is 1134 kJ.
What is combustion?Combustion of a substance is its reaction with atmospheric oxygen producing carbon dioxide and water. Combustion of hydrocarbons gases takes places easily and can be burned easily for fuels.
The chemical equation of combustion of methane is written below:
[tex]\rm CH_{4} + 2O_{2} \rightarrow CO_{2} + 2H_{2}O[/tex]
This is an exothermic process and heat is released from the reaction system.
The heat released by the combustion of one mole of methane is 810 kJ.
molar mass of methane = 16 g/mol
no.of moles in 22.4 g = 22.4/16 = 1.4 g
Thus, heat released by 1.4 moles = 1.4 ×810 kJ =1134 kJ.
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A 1,000-mL sample of ethanol is tested. Its boiling point is determined to be 78.4°C. What is the most reasonable prediction of the boiling point for a 100-mL sample of ethanol?
Answer:
78.4°C
Explanation:
Boiling point does not depend on the mass of the substance present, only the heat content is a function of the mass or volume of the substance in consideration. If there is 1000 ml of ethanol and it boils at 78.4°C, a 100 ml sample too should boil at the same temperature of 78.4°C.
You are given a piece of paper and a match. The paper has a mass of 2.5 g. You then light the match and light the piece of paper on fire. After it burns, the remaining bits of paper weigh 0.5 g. Does this demonstration violate the conservation of mass? Explain why or why not?
Answer:
No
Explanation:
No. The demonstration does not violate the conservation of mass.
The law of conservation of mass states that mass can neither be created nor destroyed in a reaction. However, mass can be converted from one form to another during the reaction.
In this case, even though the remaining bits of paper weigh 0.5 g while the original paper weighed 2.5 g, the ashes and smoke/gas from the burning will all add up to the lost weight of the paper.
The burned part has been converted into other forms. If the smoke/gas and the ashes are properly captured, they will mark up with the weight of the remaining paper to give the weight of the original paper.
The answer to the question on whether the burning violates the law of conservation of mass, we say that;
No, the demonstration does not violate the conservation of mass because the mass formed still adds up to the original mass.
The law of conservation of mass states that mass in an isolated system, matter can neither be created nor destroyed by chemical reactions or physical transformations. However, it could involve change in mass from one form to another.
Now, we are told that the remaining bits of paper has a mass of 0.5 g while the original paper has a mass 2.5 g. The reason why the mass left is 0.5 kg is because the ashes and smoke from the burning will add up to give the original weight of the paper.
Thus, since when the ashes, and smoke add up to still give the original mass of 3.5 g, it means that the mass is neither created nor destroyed
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5. 54 J of heat is required to raise the temperature of a 2.47g unknown substance from 17.10C to 46.70C. a) Calculate the specific heat of the substance b) What is the substance
Answer:
C = 0.7385J/g°C
Explanation:
Heat energy (Q) = 54J
Mass (m) = 2.47g
Initial temperature (T1) = 17.10°C
Final temperature (T2) = 46.70°C
Specific heat capacity of substance (c) = ?
Heat energy of a substance (Q) = Mc∇T
Q = heat energy
M = mass of the substance
C = specific heat capacity of the substance
∇T = change in temperature of substance = T2 - T1
Q = mc∇T
Q = mc (T2 - T1)
54 = 2.47 * c * (46.70 - 17.10)
54 = 2.47 * 29.6 * c
54 = 73.112c
C = 54 / 73.112
C = 0.7385
Specific heat capacity of the substance is 0.7385J/g°C
B.
The specific heat capacity of the above substance does not match any metal in the periodic table, however the closest to it was potassium with a value of 0.7536J/g°C and silicone with value of 0.711756J/g°C
Answer:
The specific heat of the substance is 0.739 J/g°C
The substance can be glass or SiO2
Explanation:
Step 1: Data given
Heat required = 54 J
Mass of the substance = 2.47 grams
Initial temperature = 17.10 °C
Final temperature = 46.70 °C
Step 2: Calculate the specific heat of the substance
Q = m*c¨*ΔT
⇒with Q = the heat required =54 J
⇒with m = the mass of the substance = 2.47 grams
⇒with c = the specific heat of the substance = TO BE DETERMINED
⇒with ΔT = the change of temperature = T2 - T1 = 46.70 - 17.10 = 29.60 °C
c = Q / (m*ΔT)
c = 54 / (2.47 * 29.60)
c = 0.739 J/g°C
The specific heat of the substance is 0.739 J/g°C
The substance can be glass or SiO2
PLEASE HELP!!! GIVING MOST BRAINLIEST
Answer:
Funnel and filter paper
Explanation:
the balance of it just balances things out, the beaker and flask will only help you with the measuring , and the watch glass is to see different things clearer.
Answer: Funnel, filter paper
Explanation: The balance of it just balances things out. The beaker and flask will help you with the measuring. The watch glass is to see different things objects clearer.
Hope this helps : )
elements in the periodic table are listed in order of their -----
Answer:
In numerical order left to right, they are arranged by the number of protons in the nucleus of a single atom of each element
Answer:They are in order of their increasing atomic number
Which reaction model represents a nuclear fission reaction?
A → B + C + n
A + C → B + n
A → B + C
n + A → B + C + n
Answer:
n + A → B + C + n
Explanation:
When a neutron hits the nucleus of an atom, the nucleus splits into two fragments of equal mass and emits two or three neutrons.
A reaction is monitored and the products are found to be a salt and water. The reactant(s) must have been___
Which of the following statements is a testable hypothesis for an experiment
that compares wild horses and tame horses?
Answer:
Explanation:
There are many different testable hypothesis and experiments that can be made in order to prove this. Since there are no available statements let me provide one.
Testing and Comparing the excrement of wild and tamed horses.
This is because the excrement of tame horses will show higher levels of man-made chemicals and additives due to the different man-made horse food that the owners are giving them. Wild horses on the other hand will not since they nourish themselves on naturally grown grass.
The teeth of wild horses wear down faster than the teeth of a tame horse.
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Polar vs nonpolar molecules definitions.
Answer: Polar molecules occur when there is an electronegativity difference between the bonded atoms. Nonpolar molecules occur when electrons are shared equal between atoms of a diatomic molecule or when polar bonds in a larger molecule cancel each other out.
Explanation:
Question
2 Points
Describe the path of a light ray that hits a mirror at its vertex.
A. It is reflected back through the focus.
B. It is absorbed by the mirror.
C. It is reflected out at exactly the same angle at which it came in,
according to the Law of Reflection.
D. It is reflected back parallel to the principal axis.
SUBMI
Hurry
Answer:D
Explanation:
Answer:
D
Explanation:
Would you recommend storing nuclear waste near natural resources? Explain why or why not.
Answer:
No
Explanation
I say no because that could possibly put many species of animals i danger of nuclear reaction. Not only would it put many animals in danger it would put humans plant and most likely make that area a toxic waste for years
Answer:
No
Explanation:
1. Which type of organic compound is represented by the structural formula shown below?
a) Ether
b) Ester
C) Alcohol
d) Aldehyde
Answer:
c. alcohol
Explanation:
Alcohol is -OH
Ether is -OR
Ester is O=C-OR
Aldehyde is O=C-H
- Only alcohol fits
Alcohol is the type of organic compound is represented by the structural formula.
What is Alcohol?This can be defined as the type of organic compound that carries at least one hydroxyl functional group (−OH) bound to a saturated carbon atom.
The hydroxyl group(OH) is attached to a Carbon atom in the diagram which depicts features of an Alcohol.
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You are trying to dilute antifreeze to put in your car. You use 1.00 L of the antifreeze with a concentration of 9.24 M. You add water until the volume is 3.00 L. What is the molarity of the diluted antifreeze solution?
Answer:
1 x 9.24 = 3m. Solve m is 3.08M
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Convert 22.7 grams of H2O to molecules
Answer: 1.2600414759026783 mol
Explanation: