Final answer:
When ΔH is negative and entropy effects are negligible, the reaction is likely spontaneous because it is exothermic and releases heat, contributing to a negative Gibbs free energy which predicts spontaneity.
Explanation:
If a reaction has a negative ΔH (delta H), and there are no significant entropy effects, meaning the change in entropy (δS) is not large enough to influence the reaction significantly, the reaction is likely to be spontaneous. This is because a negative ΔH indicates that the reaction is exothermic, which means it releases heat. In the absence of significant entropy effects, the exothermic nature of the reaction would drive it towards spontaneity as per Gibbs free energy (ΔG = ΔH - TΔS), which would be negative when ΔH is negative and ΔS is negligible or positive.
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Just need a small paragraph for each heading.
A gas in a rigid container is heated so that it’s kelvin temperature doubles . What happens to its pressure
How much heat do you need to raise the temperature of 150 g of ice from -30°C to -15°c?
The heat needed to raise the temperature of 150 g of ice from -30°C to -15°C is 4704 Joules. This uses the fact that the heat absorbed by ice in its solid state is constant (0.50 cal/g °C), and the principle that heat calculations rely on mass, specific heat capacity, and the change in temperature.
Explanation:In the question, the student needs to find out the amount of heat required to raise the temperature of 150 g of ice from -30°C to -15°C. The task only involves heating ice, while keeping it in solid form as the raised temperatures are still below 0°C. To find the required heat, we can use the formula q = mcΔT, where 'q' is heat, 'm' is mass, 'c' is the specific heat capacity and 'ΔT' is the change in temperature. From the available information, ice absorbs heat at a constant rate of 0.50 cal/g °C. We have to translate this into the SI unit for heat (Joules) as: 1 cal = 4.184 J. Therefore, the specific heat of ice in SI units is: 0.50 cal/g °C * 4.184 J/cal = 2.092 J/g °C.
Substitute the given values into the formula: q = 150 g * 2.092 J/g °C * 15 °C = 4704 J. Therefore, 4704 Joules of heat is needed to raise the temperature of 150 g of ice from -30°C to -15°C.
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how many moles of nh3 can he produced from the reaction of 38 g of n2
Wind and ocean currents do not move in straight lines; instead, they curve as they move across the planet. What is responsible for this pattern of movement? A.differences in water temperature B. differences in water salinity C.the Coriolis effect D.differences in water density
please help now
The correct answer is: [C]:
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→ " the Coriolis effect " .
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Hope this helps!
Best wishes!
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How does fluorine react with ethene?
1. By substituting hydrogen with fluorine.
2. By breaking a carbon double bond and adding fluorine.
3 By removing hydrogen because of fluorine’s attraction to hydrogen’s nucleus.
4. Fluorine and ethene do not react spontaneously.
Option 3: By removing hydrogen because of fluorine's attraction to hydrogen's nucleus.
The reaction of ethene and halogen generally breaks the carbon-carbon double bond and substitution of halogen on carbon takes place, this is known as halogenation reaction. This is in the case of reaction of ethene with chlorine, bromine and iodine. In the case of fluorine, due to high electronegativity it get attracts to the nucleus of hydrogen and form hydrogen fluorine gas. Therefore, halogentaion reaction do not take place in the case of ethene and iodine.
Ethene explosively reacts with fluorine to form carbon and hydrogen fluoride gas. The reaction is as follows:
[tex]CH_{2}CH_{2}+2F_{2}\rightarrow 2C+4HF[/tex]
Zn(s) + 2HCl(aq) → ZnCl2(aq) +H2(g)
What type of reaction is shown?
A: Precipitation
B: Neutralization
C: Single replacement
D: Double replacement
Answer:
C: Single replacement
Explanation:
a test tube full of sulfur dioxide gad was turned upside down in a beaker of water and universal indicator.after a few minutes the water hae risen up the test tube why does the water rise up the test tube
Which of the following best describes sublimation?
A: A solid melting to a liquid
B: A solid melting to a liquid, which then evaporates
C: The movement of gaseous particles so that they fill the space they occupy
D: A solid forming a gas
Sublimation is best described as a solid converting to a gas. Sublimation occurs when a substance moves directly from the solid to the gas phase without first passing through the liquid phase.
What is sublimation?Sublimation occurs when a substance moves directly from the solid to the gas phase without first passing through the liquid phase. Sublimation an endothermic phase transition occurs at pressures and temperatures below a chemical's triple point in the phase diagram. Sublimation is the process by which a substance moves directly from the solid to the gas state without passing through the liquid state.According to physics, sublimation is the process of converting a substance from solid to gaseous state without it becoming liquid. At typical atmospheric pressure and temperature, the evaporation of dry ice, which is frozen carbon dioxide, is an example.To learn more about sublimation, refer to:
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A train travels 97 kilometers in 2 hours, and then 96 kilometers in 2 hours. What is its average speed?
what planet has the largest known mountain in the solar system Two Moons and a period of rotation equal to 24.6 hours
Question 3(Multiple Choice Worth 2 points) When 3.5 mol Al react with 12.5 mol HCl, what is the limiting reactant and how many moles of H2 can be formed? 2Al + 6HCl yields 2AlCl3 + 3H2 Al is the limiting reactant, and 3.5 mol H2 can be formed HCl is the limiting reactant, and 3.2 mol H2 can be formed Al is the limiting reactant, and 5.3 mol H2 can be formed HCl is the limiting reactant, and 6.3 mol H2 can be formed
Identify whether each element is a halogen, a noble gas, or nonmetal only. Astatine (At): Nitrogen (N): Krypton (Kr): Chlorine (Cl): Sulfur (S):
Answer:
Astatine and chlorine are halogens onlyNitrogen and sulphur are non metals onlyKrypton (Kr) is noble gas onlyExplanation
Answer:
Astatine are halogens only
Nitrogen are non metals only
Krypton (Kr) is noble gas only
Chlorine (Cl): halogen
Sulfur (S) non metals only
Explanation:
If you wanted to determine the temperature of a star which measurement would you maker
To determine a star's temperature, measuring its absorption spectrum or emission spectrum is best, as the Doppler shifts within the lines of the spectrum hint at the star's temperature. Option C, D is correct.
The colors and spectral classes obtained from these spectra can help estimate the star's temperature. The spectrum of a star reveals the specific wavelengths of light that the star emits or absorbs.
The emission spectrum reveals the wavelengths of light a star emits, which we can use to estimate the star's temperature. Similarly, by analyzing the absorption spectrum, which consists of dark lines superimposed on the continuous spectrum of the star, temperature can also be inferred.
The absorption spectrum is specifically of interest because the precise measurement of the width of absorption lines allows for determining the temperature; these Doppler shifts in the absorption lines are prominent and easier to detect, compared to shifts in the continuous spectrum.
Hence, C. D. is the correct option.
The complete question is:
If you wanted to determine the temperature of a star which measurement would you maker ?
A) Refraction
B) Doppler shift
C) emission spectrum
D) absorption spectrum
Sucrose is very soluble in water. At 25◦C, 211.4 grams of sucrose will dissolve in 100 g of water. Given that the density of the saturated sucrose solution is 1.34 g/mL, what is the molarity of the solution? The molar mass of sucrose is 342 g/mol.
To calculate the molarity of the sucrose solution, you first find the total volume of the solution, then calculate the number of moles of sucrose, and finally divide the moles of sucrose by the volume of the solution in liters. The molarity of the given sucrose solution ends up being approximately 2.67 M.
Explanation:The molarity of a solution, expressed in moles of solute per liter of solution (mol/L), is calculated by first determining the total volume of the solution. Given the density (1.34 g/mL) and the mass of the solution (211.4 g sucrose + 100 g water = 311.4 g), the volume of the solution is found by dividing total mass by the density: 311.4 g / 1.34 g/mL = 232.39 mL or 0.232 L.
Next, we find the number of moles of sucrose, which is the mass of sucrose divided by its molar mass: 211.4 g / 342 g/mol = 0.618 moles.
From these calculations, the molarity can then be calculated as moles of sucrose divided by the volume of the solution in liters: 0.618 mol/0.232 L = 2.67 M.
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The molarity of the solution is calculated by dividing the moles of sucrose by the volume of the solution. The moles of sucrose is found by dividing the mass of sucrose by its molar mass, and the volume of the solution is calculated from the total mass of the solution and its density. The calculated molarity of the solution is 2.66 M.
Explanation:The question is asking for the molarity of the solution. Molarity (M) is a measure of concentration and is calculated by taking the amount of solute (in moles) divided by the volume of the solution (in liters). In this case, we know the mass of the solute (sucrose) and its molar mass, so we can calculate the moles of sucrose in the solution using these values. The mass of sucrose is 211.4 g and the molar mass is 342 g/mol, so the number of moles of sucrose is 211.4 g / 342 g/mol = 0.618 moles.
Next, we need to determine the volume of the solution. We know that the density of the solution is 1.34 g/mL and that 1 mL is equal to 1 cm^3. From the problem, we know that there are 211.4 g sucrose + 100 g water = 311.4 g in the solution. Therefore, the volume of the solution is 311.4 g / 1.34 g/mL = 232.24 mL, which converts to 0.23224 L. Now, we can calculate the molarity by dividing the moles of sucrose by the volume of the solution: 0.618 moles / 0.23224 L = 2.66 M.
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Hydrogen fuel cells combine hydrogen and oxygen to produce water and energy. Assume 1 kg of fuel is used, and the mass of the water produced is 1.10 x 10-11 kg. How much energy is produced by this fuel cell?
The energy produced by a hydrogen fuel cell that uses 1kg of hydrogen to produce a certain amount of water can be calculated using Einstein's mass-energy equivalence principle (E=mc²). Because the converted mass is approximately 1 kg, the energy produced is approximately 9 × 10⁶ Joules.
Explanation:The question is asking how much energy a hydrogen fuel cell produces if it uses 1kg of hydrogen to produce a certain amount of water. Hydrogen fuel cells work through an electrochemical reaction of hydrogen and oxygen, producing water and energy.
The energy production can be calculated through E=mc², Einstein's mass-energy equivalence principle. Here, 'E' is energy, 'm' is mass, and 'c' is the speed of light. According to the data provided, the mass converted into energy is the difference between the initial hydrogen mass (1 kg) and the mass of the water produced (1.10 x 10-11 kg), which is approximately 1 kg. Therefore, the energy produced would be E=mc² = 1 kg × (3 × 10⁸ m/s)² = 9 × 10⁶ Joules.
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if a minerals breaks into cubes when struck with a rock hammer, which property of mineral is being measured
a.) streak
b.) cleavage
c.) hardness
d.) color
I need one last question to finish up, please help!
besides the major types of radioactive decay there are two others: positron emission and electron capture.
-compare and contrast positrons with electrons
-explain how positron emission works and how it causes transmutations
-explain how electron capture works and how ir causes transmutations
-compare the transmutations caused by positron emissions and electron capture
Positron emission = emission of a positron and a neutrino when a proton is convert into a neutron. The total number of particles in the nucleus doesn't change, -1 proton +1 neutron
It's a spontaneous reaction for some nucleus.
eg:
Positron = e+
Neutrino=ve
O-15 --> N-15 + e+ +ve
Electron capture= A nucleus absorb an electron while a proton is convert in a neutron and emit a neutrino. The total number of particles in the nucleus doesn't change, -1 proton +1 neutron
eg:
Al-26 +e- --> Mg-26 + ve
Electron capture and positron emission are two mechanisms to explain the decay of some unstable isotopes. Electron capture is usually observed when the energy difference between the initial and final state is low. Mainly because of the larger amount of kinetic energy need for the expulsion of two particles with the positron emission mechanism.
in the induced fit model of enzymes, a substrate associates itself with which part of an enzyme?
There are a few different shapes of airplanes being considered in the design of a new airplane. One design would add protrusions to the wings (such as fuel pods, water tanks, and missiles) to give the airplane extra storage. Which of the following is a likely drawback to this design?
C. The design would not be cost-efficient; the plane would require more fuel due to increased thrust from higher drag.
Adding protrusions to the wings of an airplane, such as fuel pods and missiles, will likely result in increased drag, impacting the speed, fuel efficiency, stability, maneuverability, and safety of the airplane.
Explanation:The likely drawback to adding protrusions to the wings, such as fuel pods, water tanks, and missiles, is increased drag. Drag is the resistance encountered by an object when it is moving through a fluid, such as air. Any protrusions on the wings will create extra surfaces that disrupt the smooth flow of air over the wings, resulting in increased drag.
Increased drag can have several negative effects on the airplane. It can reduce the airplane's speed and fuel efficiency, making it less economical to operate. Additionally, increased drag can make the airplane less stable and maneuverable, affecting its handling and safety.
Therefore, while the extra storage may be beneficial, the increased drag is a likely drawback of this design.
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if the mass of an object on earth is 40 kilograms its mass on the moon is 64 kilograms but what eould be the weight on the moon
The weight of an object with a mass of 40 kilograms on the Moon would be 66.8 Newtons, as weight is calculated by multiplying the mass by the lunar gravitational acceleration of 1.67 m/s².
If the mass of an object on Earth is 40 kilograms, and assuming that mass does not change regardless of location, this mass would remain the same on the Moon. However, since weight is a measure of the force of gravity on an object, it will vary depending on the gravitational pull of the body it is on. The gravitational acceleration on the Moon is 1.67 m/s². Therefore, on the Moon, the weight of a 40 kg object would be calculated as follows:
Weight on the Moon = mass × moon's gravitational acceleration
Weight on the Moon = 40 kg × 1.67 m/s²
Weight on the Moon = 66.8 N (Newtons)
So, if an object has a mass of 40 kilograms, its weight on the Moon would be 66.8 Newtons.
Amines and amides are derivatives of:
1. nitrogen gas
2. ammonia
3. nitrous oxide
4. aldehyde
Answer: The correct answer is : 2) Ammonia
Amine :
These are organic compound which are derivatives of ammonia (NH₃) gas . In Amine one or more Hydrogen atom in ammonia are replaced by carbon atom.
The general structure of ammonia as bond between N and carbon . Number of carbons may vary from 1 to 4 .(Image attached )
Example : CH₃-NH₂ , CH₃-NH-CH₃
2) Amides :
These are organic compound in which the Hydroxyl (OH) group of carboxylic acid (COOH) is replaced by amino group (NH₂) . SO they are derivatives of carboxylic group but since they also have amino group , so they can be said as derivatives of ammonia . (image attached )
Example : CH₃-CO-NH2 , CH₃-CO-NH-CH₃ .
Hence it can be said that Amine and Amide are derivaties of ammonia (NH₃)
Amines and amides are derivatives of ammonia. They are formed by a process called substitution in which hydrogen atoms from the ammonia molecule are replaced by other functional groups.
Amines and amides are derivatives of ammonia. These molecules are both derived from ammonia by a process called substitution, where one or more of the hydrogen atoms in ammonia is replaced by other functional groups. For example, in an amine, one or more of the hydrogen atoms is replaced by an alkyl or aryl group. In an amide, one of the hydrogens in ammonia is replaced by a carboxyl group. This substitution leads to the properties that make amines and amides unique.
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what are 2 examples of materials that cells must enter or leave in order for a cell to survive?
How many moles of glucose are present in 1.0 L of a 2.5 M solution of glucose in water?
The water in a 150-mL flask is poured into a beaker that contains 600 mL of ethyl alcohol. Which substance is the solvent in this mixture?
water because it is a very polar compound
ethyl alcohol because it has a lower density than water
ethyl alcohol because it has a much larger volume than water
water because it has dissolved in ethyl alcohol
Ethyl alcohol is the solvent in this mixture because it is the substance present in a larger volume and has dissolved the water.
The substance that is the solvent in a mixture is the one that makes up the majority of the solution and is responsible for dissolving the other substance (solute). In this case, the water is poured into the beaker containing ethyl alcohol, and it's mentioned that there are 600 mL of ethyl alcohol in the beaker.
Therefore, ethyl alcohol is the solvent in this mixture because it is the substance present in a larger volume and has dissolved the water. Water is the solute in this case, as it has been added to the ethyl alcohol. The fact that water is a polar compound is not relevant in determining which substance is the solvent; the solvent is typically the substance in greater quantity in the solution.
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Which two simple machines are employed in a pair of scissors?lever and inclined plane
A: lever and wedge
B: wheel and axle and lever
C: inclined plane and wedge
D: Description
Answer:
a). lever and wedge
Explanation:
The two simple machines that are used in a pair of scissors are --
Lever and a wedge
i). Lever : A lever is a type of a simple machine that contains a long bar which is pivot at a point which is fixed. This fix point is known as the fulcrum of the lever.
ii). Wedge : A wedge is also a type of a simple machine which has two planes inclined to each other and that can move. It is generally used for cutting.
Which graph best demonstrates the general relationship between mass and temperature, similar to the trend of thermal energy absorbed by your sand and water samples
The graph that best demonstrates the general relationship between mass and temperature, similar to the trend of thermal energy absorbed by sand and water samples, is the first graph on the left.
The first graph on the left shows a negative correlation between mass and temperature, indicating that as mass increases, the temperature decreases.
This relationship often reflects how larger masses require more thermal energy to achieve the same temperature increase, which is a typical trend observed in thermal energy absorption experiments with different materials like sand and water.
The other graphs (middle and right) show no correlation and a positive correlation respectively, which do not align with the expected trend.
Which of the following is the correct name for compound S3CI2?
How is 0.246¯¯¯¯ written as a fraction in simplest form?
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What evidence did Campbell find for the cure of cancer