Which statement best describes how to read a reaction pathway graph for an endothermic reaction?
A) Reactants absorb a minimum amount of energy and then release a larger amount of energy as products form.
B) Reactants release a minimum amount of energy and then absorb a larger amount of energy as products form.
C) Reactants absorb a minimum amount of energy and then release a smaller amount of energy as products form.
D) Reactants release a minimum amount of energy and then absorb a smaller amount of energy as products form.
Answers
Answer:
C) Reactants absorb a minimum amount of energy and then release a smaller
amount of energy as products form.
Explanation:
The statement that best describes how to read a reaction pathway from the graph of an endothermic reaction is that, reactants absorb a minimum amount of energy and then release a smaller amount of energy as products form.
In an endothermic change, heat is absorbed from the surrounding.
As such, the surrounding becomes colder at the end of the reaction. On a graph of an endothermic reaction, the reactants absorbs a minimum energy. As the reaction proceeds, the products gives off an even lesser amount of energy.Related Questions
The Lewis diagram for BH2 is:
[H-B-H]-
The electron- pair geometry around the B atom in BH2 is:__________.
There are______lone pair(s) around the central atom, so the geometry of BH2 is________ .
Answers
Answer:
Electron pair geometry- trigonal planar
There is one lone pair around the boron atom
The geometry of BH2 is bent
Explanation:
The valence shell electron pair repulsion theory offers a frame work for determining the shape of molecules based on the number of electron pairs of the valence shell of the central atom in the molecule.
In BH2-, the central atom is boron. There is a lone pair on boron. Owing to the lone pair on boron, the molecular geometry of BH2 is bent.
The geometry of the electron pair around the Boron atom in \(BH_2\) is called the trigonal planar. In this case, there is a pair of isolated electrons around Boron, which is the central atom, allowing the \(BH2\) molecule to have a folded geometry.
We can arrive at this answer because:
Boron is an element that has three electrons in its valence layer.With this, we can find out that it can make three covalent bonds or donate these electrons to achieve chemical stability.In the case of the \(BH_2\) molecule, boron forms covalent bonds with Hydrogen.These bonds allow the Hydrogens to be positioned on either side of the Boron molecule, forcing a pair of their electrons to focus on the center of that molecule, until it is attracted to the extremities.This allows for a folded geometry around the molecule, allowing Boron to be an exception to the octet rule and achieve stability with 5 electrons in the valence layer.
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is nothing something and if so or if not how, is water wet, if 2 people dropped a piece of bread on the opposite sides of the earth at the same time does the world temporarily become a sandwich...?
Answers
Answer:
technically no
Explanation:
there are 2 definitions of sandwich. one is the food one: 'an item of food consisting of two pieces of bread with meat, cheese, or other filling between them, eaten as a light meal.' the earth isn't food so it can't be a sandwich. the 2nd definition is the verb : 'insert or squeeze (someone or something) between two other people or things, typically in a restricted space or so as to be uncomfortable.' by dropping a piece of bread on the opposite sides of the earth at the same time won't make the earth squished or uncomfortable, so no it can't be a sandwich ( or be sandwiched)
In plants, what does chlorophyll absorb so photosynthesis can take place?
Answers
Answer:
Chlorophyll absorbs energy from the sunlight
.What shape does each galaxy have?
Answers
Answer:
as in shapes
Explanation:
Ellie started her reaction between the KMnO4 and malonic acid by first heating the two solutions in the hot water bath. She then removed the test tubes from the water bath and poured the KMnO4 into the 75-mL test tube containing the malonic acid. She mixed the solution, placed it back into the water bath, then started the timer. For the data collected at 75 oC, indicate how the process explained above impacts the reaction time.a. The time recorded in the lab notebook is the true reaction time because the reaction only starts after the timer is started b. The time recorded in the lab notebook is longer than the true reaction time because the reaction starts the moment the two solutions were mixed c. The time recorded in the lab notebook is the true reaction time because the reaction only starts after the mixture is placed back into the hot water bath d. The time recorded in the lab notebook is shorter than the true reaction time because the reaction starts the moment the two solutions were mixed
Answers
Answer:
The time recorded in the lab notebook is shorter than the true reaction time because the reaction starts the moment the two solutions were mixed
Explanation:
A chemical reaction is "a process that involves rearrangement of the molecular or ionic structure of a substance, as distinct from a change in physical form or a nuclear reaction" (Oxford dictionary).
A chemical reaction begins immediately the reactants are mixed together in a reaction vessel because the particles of the reactants immediately begin to collide with each other. There is no lost time before reactions begins!
This implies that, the time recorded in the lab notebook is shorter than the true reaction time because the reaction starts the moment the two solutions were mixed.
Answer:
the first one is B. and E. and the second is A., B., and D. on edge 2023
Explanation:
How many moles of NaCl are there in 40.3 g of sodium chloride?
Please answer all the questions in the picture below
Thank you
Answers
Answer:
58.44277 gram
Explanation:
What do the conclusions tell about the experiment?
O A. The conclusions tell how the experiment should be repeated.
B. The conclusions tell what other scientists think about the
experiment.
C. The conclusions tell if the scientific method was followed.
D. The conclusions tell why the data support or reject the hypothesis.
Answers
Answer:
D
Explanation:
We've figured out what part of the salt causes the flame to change color, so now let's measure the wavelengths created with four metals.
Use the ruler under the "tools" icon in the upper right of the video player to measure the wavelengths of light released by each compound.
Answers
The wavelength of one of the spectral lines for strontium chloride SrCl₂ is approximately 460.7 nanometers (nm).
When strontium chloride SrCl₂ is heated, it emits a characteristic red color, which indicates that it produces spectral lines in the red part of the visible spectrum. The most intense spectral line for SrCl₂ is at approximately 460.7 nm, which corresponds to the transition from the 5² electronic configuration to the 4d state.
This transition is responsible for the red color observed when strontium chloride is introduced to a flame. The wavelength of a spectral line is related to the energy of the transition and is given by
λ = hc ÷ E
where λ is the wavelength, h is Planck's constant, c is the speed of light, and E is the energy of the transition. In the case of SrCl₂, the energy of the transition from 5s² to 4d is approximately 2.69 eV, which corresponds to a wavelength of 460.7 nm.
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The complete question is:
What is the wavelength of one of the spectral lines for strontium chloride SrCl₂?
How can an igneous rock turn into a sedimentary rock?
Answers
Answer:
On the surface, weathering and erosion break down the igneous rock into pebbles, sand, and mud, creating sediment, which accumulates in basins on the Earth's surface. As successive layers of sediment settle on top of one another, the sediment near the bottom is compressed, hardens, and forms sedimentary rock.Which cause of wildfires is least likely to lead to catastrophic results
O arson
Olightning strike
O controlled burn
O unattended campfire
Answers
The controlled burn cause of wildfires is least likely to lead to catastrophic results. Therefore, option (C) is correct.
What is controlled burning?A controlled burn is a fire set intentionally for purposes of forest management, prairie restoration, farming, or greenhouse gas. A controlled burn refers to the intentional burning of slash, fuels through burn piles.
Controlled burning can be done during the cooler months to reduce fuel buildup and reduce the likelihood of serious hotter fires. Controlled burning enhances the germination of desirable forest trees, and exposes soil mineral layers which expand seedling vitality.
Controlled burning is also useful in agriculture as it is often referred to as slash and burns. It is one component of shifting cultivation, as a section of field preparation for planting called field burning. This technique is utilized to clear the land of any existing crop residue and kill weeds and weed seeds.
Field burning is less expensive but because it forms smoke and air pollutants, its use is not common in agricultural areas.
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Freezing point depression is a colligative property.The freezing point of pure water is 0.0°C. How many grams of ethylene glycol (C2H6O2) must be mixed in 100.0 g of water to lower the freezing point of the solution to -4.3°C?_______ g
Answers
Explanation:
The freezing point depression is a colligative property. We have to find the mass of ethylene glycol that we have to add to 100.0 g of water to change its freezing point from 0.0 °C to -4.3 °C.
The freezing point depression for a solution can be calculated using the following equation:
ΔTf = kf * molality * i
Where ΔTf is the freezing point depression, kf is the freezing point depression constant (it depends on the solvent and for water is 1.86 °C/m), molality is the molality of the solution and i is the Van't Hoff factor.
The Van't Hoff factor represents the number of particles formed when that compound dissolves. In our case the solute is ethylene glycol, a covalent compound, so it won't form ions when dissolved in the water. Then i is equal to 1.
The temperature must change from 0.0 °C to -4.3 °C, then the freezing point depression is 4.3 °C. So we know that:
i = 1 kf = 1.86 °C/m ΔTf = 4.3 °C
We can replace those values in the formula and find the molality of the solution.
ΔTf = kf * molality * i
4.3 °C = 1.86 °C/m * molality * 1
molality = 4.3 °C/(1.86 °C/m)
molality = 2.31 m
Now we can get the moles of ethylene glycol from the definition of the molal concentration. Molality are the moles of solute per kg of solvent. The mass of water is 100 g.
mass of solvent = 100.0 g * 1 kg/(1000 g)
mass of solvent = 0.100 kg
molality = moles of solute/(mass of solvent in kg)
moles of solute = molality * mass of solvent in kg
moles of solute = 2.31 m * 0.100 kg
moles of solute = 0.231 moles
And finally we can convert the moles of ethylene glycol to grams using its molar mass.
molar mass of C₂H₆O₂ = 62.07 g/mol
mass of C₂H₆O₂ = 0.231 moles * 62.07 g/mol
mass of C₂H₆O₂ = 14.4 g
Answer: 14.4 g of ethylene glycol must be mixed.
Based on a Kc value of 0.250 and the given data table, what are the equilibrium concentrations of XY, X, and Y , respectively?
Answers
From the solution that we have in the question;
The concentration of X and Y is 0.28 MThe concentration of XY is 0.32 MWhat is the equilibrium constant?The equilibrium constant, denoted as K, is a value that quantitatively represents the ratio of the concentrations of products to reactants at equilibrium in a chemical reaction.
It is a fundamental concept in chemical equilibrium.
The value of the equilibrium constant provides valuable information about the position of equilibrium and the relative concentrations of species involved in a chemical reaction.
Kc = [X] [Y]/[XY]
\(0.25 = (0.1 + x)^2/(0.5 - x)\)
\(0.25(0.5 - x) = (0.1 + x)^2\)
\(0.125 - 0.25x =0.01 + 0.2x + x^2\\ x^2 + 0.45x - 0.115 = 0\)
x = 0.18 M
The equilibrium amount of X and Y= 0.28 M and the equilibrium concentration of XY = 0.32 M
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Based on the answer to the question that we have;
A 0.28 M concentration of X and Y exists at equilibriumXY's concentration at equilibrium is 0.32 M.The equilibrium constantThe ratio of the product to reactant concentrations in a chemical reaction at equilibrium is represented quantitatively by the equilibrium constant, abbreviated as K.
It is a cornerstone of the theory of chemical equilibrium.
A chemical reaction's equilibrium position and the relative concentrations of the species involved can both be learned from the equilibrium constant's value.
Kc = [X][Y]/[XY]
\(0.25 = (0.1 + x)^2/(0.5 - x)\\0.25(0.5 - x) = (0.1 +x)^2\\0.125 - 0.25x = 0.01 +0.2x +x^2\\= 0.18 M\)
The equilibrium concentration of;
XY =0.5 - 0.18
=0.32 M
Then the equilibrium amount of
X and Y is
0.1 + 0.18= 0.28 M.
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how many moles are in a 25.0 grams of carbon dioxide
Answers
answer:44.0095
Explanation:
sana makatulong
Answer:
44.0095
Explanation:
We assume you are converting between grams CO2 and mole. You can view more details on each measurement unit: molecular weight of CO2 or mol This compound is also known as Carbon Dioxide. The SI base unit for amount of substance is the mole.
At 150°C the decomposition of acetaldehyde CH3CHO to methane is a first order reaction. If the
rate constant for the reaction at 150°C is 0.029 min, how long does it take a concentration of
0.050 mol L of acetaldehyde to reduce to a concentration of 0.040 mol L?
Answers
The decomposition time : 7.69 min ≈ 7.7 min
Further explanationGiven
rate constant : 0.029/min
a concentration of 0.050 mol L to a concentration of 0.040 mol L
Required
the decomposition time
Solution
The reaction rate (v) shows the change in the concentration of the substance (changes in addition to concentrations for reaction products or changes in concentration reduction for reactants) per unit time
For first-order reaction :
[A]=[Ao]e^(-kt)
or
ln[A]=-kt+ln(A0)
Input the value :
ln(0.040)=-(0.029)t+ln(0.050)
-3.219 = -0.029t -2.996
-0.223 =-0.029t
t=7.69 minutes
Under what conditions does a Lunar eclipse occur?
Answers
Answer:
when the Moon moves into the Earth's shadow
when the Sun, Earth, and Moon are exactly or very closely aligned with the Earth between the other two, and only on the night of a full moon
Explanation:
Why reaction between aqueous solutions of hydrochloric acid is commonly referred to as neutralization reaction?
Answers
Answer:
The chloride ion has no effect on the acidity of the solution since HCl is a strong acid. Chloride is a very weak base and will not accept a proton to a measurable extent. However, the ammonium ion, the conjugate acid of ammonia, reacts with water and increases the hydronium ion concentration:
Explanation:
Hydrogen gas is collected over water at 23°C, 767 torr. At this temperature the vapor pressure of water is 21.0 torr. What is the partial pressure of hydrogen in the collected gas?
Answers
The partial pressure of hydrogen gas in the collected gas is 746 torr.
To determine the partial pressure of hydrogen gas in the collected gas, we need to consider the difference between the total pressure of the collected gas and the vapor pressure of water at the given temperature. The partial pressure of hydrogen gas is the pressure exerted by hydrogen alone.
Given information:
Total pressure of the collected gas (Ptotal) = 767 torr
Vapor pressure of water (Pwater) = 21.0 torr
The partial pressure of hydrogen gas (Phydrogen) can be calculated using Dalton's law of partial pressures, which states that the total pressure of a mixture of gases is equal to the sum of the partial pressures of each individual gas.
Phydrogen = Ptotal - Pwater
Plugging in the given values:
Phydrogen = 767 torr - 21.0 torr
Phydrogen = 746 torr
Therefore, the partial pressure of hydrogen gas in the collected gas is 746 torr.
It's important to note that in this calculation, we assume that the water vapor does not react with or dissolve in the hydrogen gas and that the gases behave ideally. Additionally, it's assumed that the collected gas is dry, meaning all the water vapor has been removed or does not significantly contribute to the total pressure.
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If others adopted similar habits, how might the world of science change?
Answers
Answer:
Explanation:
Smoking a cigarette, snorting cocaine, or drinking yourself into oblivion are all easy habits to adopt because they light up your brain with the neurotransmitter …
What is the pH of a solution the hydroide concentration of 1 X 10.5?
Answers
Answer:
Explanation:
Therefore, the pH of the HCl solution is 5.
Using Beer's Law determine the concentration of a dye dissolved in water that has an absorptivity of 1 x 102 cm-1M-1 and produces an absorbance reading 1.0. The length of the cuvette is 1 cm.
Answers
Answer:
1 × 10⁻² M
Explanation:
Step 1: Given data
Absorptivity of a dye (ε): 1 × 10² cm⁻¹M⁻¹
Absorbance (A): 1.0
Length of the cuvette (l): 1 cm
Concentration of a dye (C): ?
Step 2: Calculate the concentration of the dye
We will use Beer's Law.
A = ε × l × C
C = A / ε × l
C = 1.0 / 1 × 10² cm⁻¹M⁻¹ × 1 cm
C = 1 × 10⁻² M
The concentration of the dye is 1 × 10⁻² M.
Prepare one solution that has 0.12 M of FeCl3 and 0.40 M of HCl with the reagents 3 M HCl and Solid FeCL3 * 6H20. Provide the calculations and protocol to make the solution in a lab.
Answers
To prepare a 0.12 M solution of FeCl₃, the amount of solid FeCl₃ to be dissolved in a given volume of solvent will be 9.72 grams.
Given,
Molarity of FeCl₃ (M)= 0.12 M
The molecular weight (m) of FeCl₃ is = 162 gm
The volume of the solution (V) to be prepared is =500 ml
The amount of FeCl₃ to be dissolved to make a 0.12 M solution is= x
So,
MV= x ÷ m × 1000
0.12× 500 = x ÷ 162 × 1000
x = 60 × 162 ÷ 1000
x= 9.72 gm
So 9.72 grams of FeCl₃ is dissolved to make 500 ml of 0.12 M solution.
For preparing 0.4 M HCl from 4M HCL:
If we need to make 500 ml of solution with 0.4M of HCL, then we use the formula:
M₁V₁= M₂V₂
0.4 × 500= 4 × x
x= 50 ml
So 50 ml of 4M HCL is taken to make 0.4 M HCL.
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help ME I NEED AN 8 DIGIT CODE WITH NO SPACES HELP
Answers
Answer:
ok so I don't really understand how you get 8 digits, but Q1 goes to Digit 1, Q2 goes to digit 3, Q3 goes to digit 4, and Q4 goes to digit 2
Explanation:
sorry!!!!!!
NEED HELP ON THIS QUESTION
Answers
54.2 g of CaCl2 must be dissolved in 1000 g of water to raise the boiling point to 100.75°C.
The mass of CaCl2To solve this problem, we can use the formula:
ΔTb = Kb × m × i
where ΔTb is the boiling point elevation, Kb is the molal boiling point elevation constant for water, m is the molality of the solution, and i is the van't Hoff factor, which represents the number of particles into which the solute dissociates.
We can rearrange this formula to solve for the molality of the solution:
m = ΔTb / (Kb × i)
We know that ΔTb is 0.75°C (100.75°C - 100°C), Kb is 0.51°C/m, and i for CaCl2 is 3 (since it dissociates into 3 ions in water). Substituting these values, we get:
m = 0.75°C / (0.51°C/m × 3) = 0.490 m
To find the mass of CaCl2 needed to make a 0.490 m solution in 1000 g of water, we can use the formula:
moles of solute = molality × mass of solvent (in kg)
We convert 1000 g of water to 1 kg, and then use the molecular weight of CaCl2 to convert from moles to grams:
moles of CaCl2 = 0.490 m × 1 kg = 0.490 mol
mass of CaCl2 = 0.490 mol × 110.98 g/mol = 54.2 g
Therefore, 54.2 g of CaCl2 must be dissolved in 1000 g of water to raise the boiling point to 100.75°C.
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prop-1-yne + 2HBr/H2O2 = A;
A + 2H2O = B;
B + K2CO3(aq) = C;
C + heat = D;
D + HBr = E.
find the compounds A, B, C, D and E
Answers
Based on the given reactions, the compounds are as follows:
A: The specific product formed from the reaction between prop-1-yne and either 2HBr or H2O2.
B: The product formed when compound A reacts with 2H2O.
C: The product formed when compound B reacts with K2CO3(aq).
D: The product formed from the heat-induced reaction of compound C.
E: The product formed when compound D reacts with HBr.
Based on the given reactions, let's analyze the compounds involved:
Reaction 1: prop-1-yne + 2HBr/H2O2 = A
The reactant prop-1-yne reacts with either 2HBr or H2O2 to form compound A. The specific product formed will depend on the reaction conditions.
Reaction 2: A + 2H2O = B
Compound A reacts with 2H2O (water) to form compound B.
Reaction 3: B + K2CO3(aq) = C
Compound B reacts with K2CO3(aq) (potassium carbonate dissolved in water) to form compound C.
Reaction 4: C + heat = D
Compound C undergoes a heat-induced reaction to form compound D.
Reaction 5: D + HBr = E
Compound D reacts with HBr (hydrobromic acid) to form compound E.
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What is the vapor pressure of SiCl4
in mmHg
at 33.0 ∘C
? The vapor pressure of SiCl4
is 100 mmHg
at 5.4 ∘C
, and ΔHvap
= 30.2 kJ/mol
.
Answers
The vapor pressure of the SiCl₄ in the mmHg at the 33.0 °C is the 312 mmHg.
The Clausius - Clapeyron equation is as :
ln ( P₂ / P₁ ) = ΔHvap / R ( 1 / T₁ - 1 / T₂ )
P₂ = P₁eˣ
Where,
The temperature, T₁ = 5.4 °C = 278.55 K
The temperature, T₂ = 33.0 °C= 306 K
The pressure, P₁ = 100 mmHg
ΔHvap is the heat of the vaporization = 30.2 kJ /mol = 30200 J/mol
The gas constant, R = 8.314 J / mol K
x = ΔHvap / R ( 1 / T₁ - 1 / T₂ )
x = 30200 / 8.314 ( 1/ 278.55 - 1/ 306 )
x = 1.05
P₂ = 100 \(e^{1.05}\)
P₂ = 312 mmHg
The vapor pressure of the SiCl₄ is 312 mmHg.
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The kinetic energy of a 23.2-g object moving at a speed of 98.7 m/s is ________ J. The kinetic energy of a 23.2-g object moving at a speed of 98.7 m/s is ________ J. 0.950 145 113 1450 113000
Answers
The kinetic energy of a 23.2-g object moving at a speed of 98.7 m/s is 113.30 J. Option D
The kinetic energy of an object can be calculated using the formula: KE = (1/2)mv^2, where KE is the kinetic energy, m is the mass of the object, and v is the velocity or speed of the object.
Given:
Mass (m) = 23.2 g = 0.0232 kg
Speed (v) = 98.7 m/s
Substituting these values into the formula, we can calculate the kinetic energy:
KE = (1/2)(0.0232 kg)(98.7 m/s)^2
KE = (1/2)(0.0232 kg)(9756.09 m^2/s^2)
KE ≈ 113.30 J
Therefore, the kinetic energy of a 23.2-g object moving at a speed of 98.7 m/s is approximately 113.30 J.
It's worth noting that the question is repeated twice, but the answer remains the same. The kinetic energy of the object is determined by its mass and speed, and both calculations yield the same result. Option D
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17.3 L to mL conversiones sistema métrico
Answers
Answer:
17300ml
Explanation:
17.3 X 1000 = 17300ml
A 300K gas at 1.5 atm is pressurized to 2.25 atm. What is its resulting temperature in K?
Answers
Step 1 - Understanding the relation between temperature and pressure
There are three main variables that can modify the state of a gas: pressure (P), volume (V) and temperature (T). When one of them is kept constant, linear relationships arise between the remaining two.
So when we keep the volume constant (isovolumetric transformation), the pressure and the temperature become directly proportional, i.e., the greater the temperature, the greater the pressure and vice-versa.
We can state it mathematically as:
\(\frac{P_1}{T_1}=\frac{P_2}{T_2}\)Step 2 - Using the equation to solve the question
Discuss the large-scale environmental impacts of soil pollution caused by industrial wastes.
Answers
Answer: Industrial processes including mining and manufacturing historically have been leading causes of soil pollution. Industrial areas typically have much higher levels of trace elements and organic contaminants. This is due to intentional and unintentional releases from industrial processes directly into the environment, including to the soil, adjacent water bodies, and the atmosphere.
Explanation:
Liquid octane (CH3(CH2)6CH3) will react with gaseous oxygen (O2) to produce gaseous carbon dioxide (CO2) and gaseous water (H2O). Suppose 17. g of octane is mixed with 112. g of oxygen. Calculate the maximum mass of water that could be produced by the chemical reaction. Round your answer to significant digits.
Answers
The maximum mass of water that could be produced by the chemical reaction is 162 g.
The given chemical equation is: 2 C8H18(l) + 25 O2(g) → 16 CO2(g) + 18 H2O(l)In the chemical reaction of liquid octane with gaseous oxygen, the products are gaseous carbon dioxide and gaseous water.According to the balanced chemical equation, 2 moles of C8H18 react with 25 moles of O2 to form 18 moles of H2O.So, 1 mole of C8H18 react with 25/2 = 12.5 moles of O2 to form 9 moles of H2O.The molar mass of C8H18 is 114 g/mol. So, the number of moles in 17 g of C8H18 is:17 g / 114 g/mol = 0.149 molThe molar mass of O2 is 32 g/mol. So, the number of moles in 112 g of O2 is:112 g / 32 g/mol = 3.5 molFrom the balanced chemical equation, 1 mole of C8H18 react with 12.5 moles of O2 to form 9 moles of H2O.So, the number of moles of O2 required to react with 0.149 mol of C8H18 to form H2O is:(12.5 mol / 1 mol) × (0.149 mol / 2 mol) = 0.935 molThe maximum number of moles of H2O that can be produced from 0.149 mol of C8H18 and 0.935 mol of O2 is 9 mol.So, the mass of water produced from 17 g of C8H18 and 112 g of O2 is:9 mol × 18 g/mol = 162 g
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