deltaH will be equal to deltaE if the total number of moles of ______ does not change during a chemical reaction (discounting any small volume change caused by liquids or solids)
Answers
ΔH will be equal to ΔE if the total number of moles of gas does not change during a chemical reaction (discounting any small volume change caused by liquids or solids).
This is based on the principle of the conservation of energy, which states that energy cannot be created or destroyed, only transferred or converted from one form to another. In a chemical reaction, energy can be transferred between the system (the reactants and products) and the surroundings (the environment outside the system).
The enthalpy change (ΔH) of a reaction is the amount of heat energy transferred between the system and surroundings at constant pressure. The internal energy change (ΔE) of a reaction is the amount of heat energy transferred between the system and surroundings at constant volume.
If the total number of moles of gas does not change during a chemical reaction, then there is no change in volume, and ΔH will be equal to ΔE. This is because the work done by the system on the surroundings (expansion work) is zero, and the heat transfer at constant volume is equal to the change in internal energy.
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Related Questions
34 points!!!!
Directions: Answer the following questions in your own words using complete sentences. Do not copy and paste from the lesson or the internet.
1. Define the term "green party." Conduct research and find one green party. Briefly discuss the party that you found in your research.
2. Conduct an internet search on the National Environmental Education Act on this site: https://www.epa.gov/education. Read through the site. visit all the links. Write a few paragraphs about information you learn from these sections.
3. How do some conditions of urban areas affect the species that live in the area? Give one example.
4. How do societal attitudes of developed countries differ from those of undeveloped countries?
5. How do the global aspect of environmental issues positively or negatively impact local environmental issues?
Answers
Answer:
1. A "green party" is a political party that focuses on environmentalism, social justice, and grassroots democracy. One example of a green party is the Green Party of the United States. Founded in 1984, the Green Party advocates for policies such as reducing greenhouse gas emissions, promoting renewable energy, and implementing a living wage for workers. The party also supports nonviolent conflict resolution, LGBTQ rights, and universal healthcare. The Green Party of the United States has had some success in winning local elections, with members holding positions in city councils and state legislatures across the country.
2. The National Environmental Education Act (NEEA) was passed in 1990 to promote environmental education in the United States. The Environmental Protection Agency's (EPA) website on NEEA provides information on the history and purpose of the act, as well as resources for educators and students. Through NEEA, the EPA provides grants to support environmental education programs at the local, state, and national levels. The website also includes information on EPA programs and initiatives related to environmental education, such as the Environmental Education Collaborative and the National Environmental Education Foundation.
3. Urban areas can have a significant impact on the species that live in the area. For example, urbanization can lead to habitat fragmentation, which can disrupt the natural movements and breeding patterns of species. The loss of natural habitats and the introduction of non-native species can also negatively impact the biodiversity of urban areas. Additionally, pollution and other environmental stressors in urban areas can have harmful effects on the health and well-being of both humans and other species.
4. Societal attitudes in developed countries tend to prioritize economic growth and technological progress, often at the expense of environmental conservation. In contrast, attitudes in undeveloped countries may prioritize the preservation of natural resources and traditional ways of life. However, this is not always the case, and attitudes towards the environment can vary widely within and between countries.
5. Environmental issues are often global in nature, such as climate change and ocean pollution, and can have impacts that transcend national boundaries. Local environmental issues may also be impacted by global factors, such as the transportation of pollutants or the introduction of non-native species. However, global awareness and cooperation can also be a powerful force for addressing local environmental issues and promoting sustainable practices.
Explanation:
what mass of fe2o3 is produced when 27.2 l of o2 gas react with fes at 452 k and 3.86 atm. 4fes(s) 7o2(g)⟶2fe2o3(s) 4so2(g) first, use the ideal gas equation to calculate the moles of o2. ????
Answers
Using the ideal gas equation, the number of mole of O₂ is 2.83 mol.
What is the ideal gas equation?PV = nRT is the formula for the ideal gas equation. In this equation, P denotes the ideal gas's pressure, V the volume of the ideal gas, n the total amount of ideal gas measured in moles, R the universal gas constant, and T the temperature.
The reaction becomes:
4 FeS (s) + 7O₂ (g) → 2Fe₂O₃ (s) + 4SO₂ (g) .
Volume of O₂ = 27.2 L .
Pressure = 3.86 atm.
Temperature = 452 K .
We have to calculate what mass of Fe₂O₃ will be produced from the given starting material.
We know that,
According to Ideal gas law,
PV = nRT
Where ,
P is pressure
V is volume
n is number of mole.
R is gas constant.
T is temperature.
Now putting the values,
3.86 atm x 27.2 L = n x (0.0821 L.atm/ mol.K) x 452 K
n = 2.83 mol.
So the number of mole of O₂ is 2.83 mol.
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An old refrigerator is rated at 500 W how many kilowatt hours of electric energy what does refrigerator use in 30 days assume the refrigerator is running 12 hours per day
Answers
The refrigerator would use 180 kilowatt-hours (kWh) of electric energy over the course of 30 days, assuming it runs for 12 hours each day.
To calculate the kilowatt-hours (kWh) of electric energy used by the refrigerator in 30 days, we need to multiply the power rating by the total running time.
Given:
Power rating of the refrigerator = 500 W
Running time per day = 12 hours
Number of days = 30
First, we need to convert the power rating from watts to kilowatts:
Power rating = 500 W / 1000 = 0.5 kW
Next, we calculate the total energy used in kilowatt-hours (kWh) over the 30-day period:
Energy used = Power rating × Running time × Number of days
Energy used = 0.5 kW × 12 hours/day × 30 days
Energy used = 180 kWh
Therefore, the refrigerator would use 180 kilowatt-hours (kWh) of electric energy over the course of 30 days, assuming it runs for 12 hours each day.
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what is 2 times 34528
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Jacqueline is interested in helping her overweight cat lose weight so that he will be healthier and more active. She selects a new cat food based on the label’s claim that it can help with weight loss. Jacqueline measures out the food carefully each day, has been weighing the cat every 48 hours, and records the measurement. What keeps this practice from being a scientific experiment? A. There is only one cat and one type of food being used. B. The cat should be weighed every day to collect more data. C. She has not considered whether the cat will like the new food. D. The food is not the brand that Jacqueline’s friend used for his overweight
Answers
Answer:
sorry bro / sis this is too long question soo try by yourself
a mixture of 15.0 g of the anesthetic halothane (c2hbrclf3 197.4 g/mol) and 22.6 g of oxygen gas has a total pressure of 862 torr. what are the partial pressures of each gas?
Answers
C2HBrClF3 and O2 have partial pressures of 84 torr and 778 torr, respectively.
Given,
C2HBrClF3 mass = 15.0 g
O2 mass is 22.6 g.
C2HBrClF3's molar mass is 197.4 g/mole.
O2's molar mass is 32 g per mole.
Raoult's Rule
Xsolvent = Psolution
P0solvent
P solution is the solution's vapour pressure.
"solvent" is the solvent's mole fraction.
P0solvent = the pure solvent's vapour pressure
Raoult's Law-
Raoult's law states that the partial vapour pressure of a solvent in a solution (or mixture) is equal to or the same as the pure solvent's vapour pressure times the mole fraction of the solvent in the solution.
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can someone help me with this plz??
Answers
Answer:
I dont know at all and that is confusing.
Question 2 of 30
A television commercial shows happy people while describing some medical
symptoms. These symptoms include feeling tired and sad. The medication
being advertised by the commercial was approved by the FDA to treat a
disease that causes these symptoms. The narrator says that it is available by
prescription only and contains 1% of the active ingredient. What can you infer
about this medication?
OA. The people in the commercial are happy because they were
treated by the medication.
B. The medication would be more effective if it contained 10% of the
active ingredient.
C. Anyone who has the symptoms should request a prescription
from his or her doctor.
D. The medication can treat people who have the disease described.
Answers
The medication can treat people who have the disease described. According to the commercial, the drug has FDA approval to treat a condition whose symptoms are listed.
Additionally, the narrator notes that the medication only comes with a prescription and has 1% of the active substance. We can deduce from this information that the drug can effectively treat persons who have the condition generating these symptoms, but obtaining it requires a prescription. The commercial provides no support for the other possibilities.
Therefore, the correct option is D.
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help please you’ll get 18 points to answer this correctly
Answers
0.0625-2mm
By another definition, in terms of particle size as used by geologists, sand particles range in diameter from 0.0625 mm (or 1/16 mm) to 2 mm. An individual particle in this range size is termed a sand grain.
Cobble:
64-256 mm
(a) A rock fragment larger than a pebble and smaller than a boulder, having a diameter in the range of 64-256 mm (2.5-10 in., or -6 to -8 phi units) being somewhat rounded or otherwise modified by abrasion in the course of transport; in Great Britain, the range of 60-200 mm has been used.
Silt:
0.002 to 0.05mm
Silt particles are from 0.002 to 0.05 mm in diameter. Sand ranges from 0.05 to 2.0 mm. Particles larger than 2.0 mm are called gravel or stones. Most soils contain a mixture of sand, silt and clay in different proportions.
Boulders:
>256 mm
In geology, a boulder is a rock fragment with size greater than 256 millimetres (10.1 in) in diameter. Smaller pieces are called cobbles and pebbles. While a boulder may be small enough to move or roll manually, others are extremely massive. In common usage, a boulder is too large for a person to move.
Protein A has a binding site for ligand X with a dissociation constant, Kd, of 3.0 x 10-7 M. Protein B has a binding site for ligand X with a K of 4.0 x 10 M. Calculate the K, for each protein.
Answers
The breakdown constant, Kd, of the binding site onto protein A for ligand X is 3.0 x 10-7 M. A ligand X binding site on protein B does indeed have a K value 4.0 x 10 M. K has a ratio of 0.133.
Describe protein.Protein, which is located in practically every cell, muscle, other body part, encompassing muscle, osteoporosis, skin, and hair, makes up the human body. It helps to produce enzymes, which power countless phase changes, and haemoglobin, which carries oxygen in the blood.
Protein A kd = 3.0 x 10⁻⁷ M
Protein B kd = 4.0 x 10⁻⁸ M
ka = ?
Protein A ka = 1/kd
= 1/ 3.0 x 10⁻⁷
ka = 0.33 * 10⁷m⁻
Protein B ka = 1/kd
= 1/ 4* 10⁻⁸
= 0.25 * 10⁸
ka = 2.5 * 10⁷ m⁻
ratio of k = 4.0 x 10⁻⁸/3.0 x 10⁻⁷
= 0.133
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plzzzzzz help me ?????
8. Well-aerated soils have the _______________ smell of good soil.
Answers
Answer:
Pore spaces filled with water
Which ion has the electron configuration of a noble gas
Answers
Answer:
chloride
Explanation:
the structure(s) that allow(s) gasses, such as co2, to diffuse into and out of a leaf is/are the:
Answers
The structures that allow gases, such as CO2, to diffuse into and out of a leaf are the stomata.
The structure that allows gasses, such as CO2, to diffuse into and out of a leaf are the stomata. Stomata are small pores located on the surface of leaves that allow for the exchange of gasses between the leaf and the surrounding environment. These openings can open and close depending on various factors, including light levels, temperature, and moisture levels.
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Need help ASAP plz. Only gave 10 min
Answers
Answer:
the answer is D
Explanation:
help please! :)
Why are prefixes not needed in naming ionic compounds?
A. lon charges are written as superscripts with the names of the
atoms.
B. Roman numerals are used instead of prefixes to indicate number.
C. Subscripts are used in the name to indicate number of atoms.
D. Ions combine in only one ratio.
Answers
Answer:
Ions combine into only one ratio
Explanation:
Just took test
Prefixes are not used to indicate the number of atoms when writing the chemical formula. The number of atoms are written as subscripts to their chemical symbols.
What is chemical formula?Chemical formula of a compound is used to identify a compound and distinguishes it from other compounds. A chemical formula is written from the chemical symbols of elements which constitute the compound.
The number of atoms of each element is written as the subscripts of the symbols for each atoms. For example,magnesium chloride contains one magnesium and two chlorine atoms thus, its formula is MgCl₂.
The subscripts for each atom in the formula of an ionic compound is the charge of the other atom into which it is bonded. Similarly, the formula of iron oxide containing 2 Fe and 3 O is written as Fe₂O₃.
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Draw the structure(s) of the major organic product(s) of the following reaction. 1. LiAlH4 / dry Et O -H 2. aqueous HCI • You do not have to consider stereochemistry. • If no reaction occurs, draw the organic starting material. • Draw one structure per sketcher. Add additional sketchers using the drop-down menu
Answers
Structure and the reaction is in the attached photo.
Amides, RCONR'2, can be reduced to the amine, RCH2NR'2 by conversion of the C=O to -CH2-. Amides can be reduced by LiAlH4 but not the with the less reactive NaBH4. Some of the reagents are LiAlH4 / ether solvent, followed by water.
This reduction reaction is different from the different to that of other C=O compounds which reduce to alcohols like in esters.
Lithium aluminium hydride (LiAlH4) and sodium borohydride are the two most frequent sources of the hydride nucleophile (NaBH4).
The presence of a polar metal-hydrogen bond in these reagents acts as a source of hydride rather than the hydride anion, which is absent during this reaction. Since the Al-H bond in LiAlH4 is more polar and aluminium is less electronegative than boron, LiAlH4 is a more potent reducer.
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Plz help plz help plz help meed
Answers
Answer:
5106.38 Ω
Explanation:
From the question given above, the following data were obtained:
Current (I) = 0.0235 A
Voltage (V) = 120 V
Resistor (R) =?
From ohm's law,
V = IR
Where:
V => is the voltage.
I => is the current
R => is the resistor
With the above formula, we can obtain the size of the resistor needed as follow:
Current (I) = 0.0235 A
Voltage (V) = 120 V
Resistor (R) =?
V = IR
120 = 0.0235 × R
Divide both side by 0.0235
R = 120 / 0.0235
R = 5106.38 Ω
Thus, the size of the resistor needed is 5106.38 Ω
Carbon cycle – What are the main reservoirs
of the carbon cycle? Where do the inorganic and organic carbon
cycles interact? What are the major differences and similarities
between the inorganic and organic carbon?
Answers
The main reservoirs of the carbon cycle are the atmosphere, oceans, land (including vegetation and soils), and fossil fuels. In these reservoirs, carbon exists in both inorganic and organic forms.
The inorganic carbon cycle involves the exchange of carbon dioxide (CO2) between the atmosphere and oceans through processes like photosynthesis and respiration.
Organic carbon, on the other hand, is found in living organisms, dead organic matter, and soil organic matter. It is cycled through processes such as decomposition and consumption by organisms. The interactions between the inorganic and organic carbon cycles occur primarily in the biosphere, where photosynthesis converts inorganic carbon into organic carbon compounds. While inorganic carbon is primarily in the form of CO2, organic carbon is present in complex organic molecules. Both forms of carbon play crucial roles in energy transfer, nutrient cycling, and climate regulation.
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which compounds are most likely to form a solution when mixed? group of answer choices hexane (c6h14) and water(h2o) hexane and ammonia (nh3) hexane (c6h14) and octane (c8h18) sodium chloride (nacl) and hexane (c6h14)
Answers
D) sodium chloride (NaCl) and hexane (c6h14) are most likely to form a solution when mixed.
Sodium chloride (NaCl) and hexane (C6H14) are two common substances that can form a solution when mixed. When these two substances are combined, the sodium chloride molecules interact with the hexane molecules and form a homogenous mixture.
This mixture allows for the two components to be evenly distributed throughout, creating a solution. The combination of sodium chloride and hexane is able to form a solution due to the polar nature of sodium chloride and the non-polar nature of hexane.
The polar nature of sodium chloride allows it to form strong hydrogen bonds with the non-polar hexane molecules, resulting in a homogenous mixture.
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when pressure is kept constant then the temperature varies with volume
a. directly
b. inversely
c. none of these
d. both a and b.
Answers
Answer:
A
Explanation:
Molecules are always in motion. True False
Answers
Answer: FALSE
Explanation:
Which of the following represents the number of Molecules of the type indicated is present as a reactant or product of the chemical reaction shown?
Answers
Following represents the number of Molecules of the type indicated is present as a reactant or product of the chemical reaction shown is the coefficient of the species
The number of atoms, molecules, or formula units of a reactant or product in a balanced chemical equation is the coefficient of that species then the mole ratio of two substances in a chemical reaction is the ratio of their coefficients in the balanced chemical equation and the this numbers are called as coefficient and they tell how many of each molecule are participate in the reaction
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How does the rock cycle work help use a easy understanding small summary
Answers
Answer: this is how it works
Explanation:
The magma bursts through Earth's surface in the form of a volcano. Heat and pressure deep in the Earth makes some rocks change to metamorphic rock. Layers of rock get squashed and packed together and gradually harden to form sedimentary rock. The igneous rock gets broken down by weather, and the cycle begins again.
he chart shows the movement of a ball after several seconds. A 2-column table with 4 rows. The first column labeled A has entries 0, 4, 8, 12, 16. The second column labeled B has entries 0, 2.5, 6, 8, 10. Column A is on the x-axis, and Column B is on the y-axis. Which titles should replace A and B?
Answers
The chart is showing the position -time graph of the movement of ball. The x-axis represents the time of travel and y-axis represents the position of the ball with respect to the time.
What is position -time graph ?The position - time graph is plotting the position of a moving object in with respect to different time. From this plot we can easily understand the displacement by an object. Similarly we can determine the speed of the object from the slope of the line.
The position is expressed in meters and the time is expressed in seconds. If the plot shows a linear curve, then the object is moving with constant speed.
Here, the position of the moving ball is given in y-axis 0, 2.5 m, 6, 8 and 10 meters with respect to the time given in x-axis as 0 ,4,8,12 and 16 seconds.
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The pH of the ocean is around 8.1, is the ocean considered a
buffer? Why or Why not?
Answers
Yes, the sea is considered a buffer.
A buffer is a solution that resists pH changes when acids or bases are added. The buffering capacity of the ocean allows it to maintain a relatively stable pH even when acids and bases are added.
The ocean's buffering capacity is primarily due to the presence of dissolved compounds such as bicarbonate (HCO3-) and carbonate (CO32-). These compounds act as both weak acids and bases, accepting and releasing hydrogen ions (H+) to maintain pH balance. When carbon dioxide (CO2) in the atmosphere dissolves in seawater, carbonic acid (H2CO3) is produced and decomposed into bicarbonate ions and hydrogen ions.
This transformation helps prevent a rapid drop in pH as excess hydrogen ions combine with carbonate ions to form bicarbonate ions, which can reduce overall acidity.
When alkali such as hydroxide ions (OH-) is added to the ocean, excess hydroxide ions combine with hydrogen ions to form water molecules, reducing alkalinity.
The presence of these dissolved compounds and their interconversion reactions stabilize the pH of the ocean, making it less susceptible to rapid changes in acidity or alkalinity. This buffering capacity is essential for the survival and maintenance of marine life, as many organisms are sensitive to changes in pH.
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What do these two changes have in common?
crushing a mineral into powder
picking up a paper clip with a magnet
Select all that apply.
Both are changes of state.
Both conserve mass.
Submit
Both are only physical changes.
Both are chemical changes.
Answers
The appearance and observable qualities of matter are considered to be its physical attributes. Colour, smell, taste, solubility, etc. An attribute that appears during a chemical reaction is known as a chemical property. A few examples include pH, reactivity, and flammability, etc. The correct option is B.
The chemical makeup or content of matter are not altered after a physical transformation. The internal makeup is unaffected as molecules rearrange themselves during this transformation. The chemical attribute is unaffected by a physical change.
Here both crushing a mineral into powder and picking up a paper clip with a magnet are physical changes.
Thus the correct option is B.
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as the temperature of a gas decreases is volume
Answers
Answer:
it's volume also decrease
What is responsible for the unusual ecosystem of the highlands?
1. Animals and animal activity. 2. Humans and human movements. 3. Volcanoes and volcanic activity 4. Rivers and river movements
Answers
Answer: Volcanoes and volcanic activity are responsible for the unusual ecosystems in the highlands.
hope this helps have a awesome day❤️✨
Explanation:
SOMEONE HELP ME PLEASE I’LL GIVE BRAINLY
Answers
Answer:
i think that describes cohesion or hydrolysis
Explanation:
1. How much heat is needed to change 250.0 grams of water at 80°C to steam at 100°C? The specific heat
of water is 4.18 J/(g°C). Show all work and label your answer with the appropriate unit.
I don’t get how to apply the formula or how I am supposed to label the units
Formula is:
Q=mass•CP•change in temperature
Answers
The amount of heat that is needed to change 250.0 grams of water at 80°C to steam at 100°C is 20900 J of heat.
What is the amount of heat required?Heat change is the amount of heat that must be added or that is evolved when a particular change occurs in a substance.
The amount of heat required is determined from the formula of heat given below as follows:
Heat change = mass * specific heat capacity * temperature change
Heat required = 250 * 4.18 * (100 - 80)
Hee=at required = 20900 J
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