If the dissolution of borax in water is spontaneous, is the change in enthalpy positive or negative - or are both signs possible? why do you predict this?
Answers
The change in enthalpy during the dissolution of borax in water can be positive or negative, depending on the relative strengths of the attractions involved.
The dissolution of borax in water can be spontaneous, meaning it occurs without the need for external energy input. The change in enthalpy during this process can be positive or negative, depending on the specific conditions.
If the change in enthalpy is negative, it indicates an exothermic process, where heat is released during dissolution. This is often observed when the attractions between the borax ions and water molecules are stronger than the attractions between the borax ions themselves. In this case, the system releases energy, and the dissolution is spontaneous.
On the other hand, if the change in enthalpy is positive, it suggests an endothermic process, where heat is absorbed during dissolution. This occurs when the attractions between the borax ions are stronger than the attractions between the borax ions and water molecules. In such cases, the system requires energy input to overcome these attractions and dissolve the borax. However, even if the process is endothermic, it can still be spontaneous if the increase in entropy (disorder) compensates for the energy input.
To predict the sign of the change in enthalpy during the dissolution of borax in water, we need to consider the strength of the attractions involved. Additionally, factors like temperature and pressure can also influence the spontaneity and the sign of the change in enthalpy.
In summary, the change in enthalpy during the dissolution of borax in water can be positive or negative, depending on the relative strengths of the attractions involved.
Learn more about enthalpy here:-
https://brainly.com/question/21369686
#SPJ11
Related Questions
An Assay Question
THE FUNDAMENTAL NATURE OF STRATEGIC MANAGEMENT REQUIRES THE AWARENESS & UNDERSTANDING OF OUTSIDE FORCES & ENCOURAGES STRATEGIC MANAGERS TO ADOPT NEW IDEAS .
ELABORATE in one word ?
Answers
The fundamental nature of strategic management requires the awareness & understanding of outside forces & encourages strategic managers to adopt new ideas is known as Adaptation.
Three definitions of adaptability are connected. First, natural selection, a dynamic evolutionary process, adapts organisms to their environments, improving their evolutionary fitness. Second, it is a state that the populace has attained along that process. Thirdly, it is a phenotypic characteristic or adaptive trait that has been preserved and has evolved via natural selection and has a functional purpose in each individual organism.
History has recorded descriptions of adaptation going back to the time of the ancient Greek philosophers Empedocles and Aristotle. Natural theology of the 18th and 19th centuries saw adaptation as proof of the presence of a deity.
To know more about Adaptation
https://brainly.com/question/31886336
#SPJ11
Two body parts with small bones
Answers
Answer:
1.The stapes in your ear:
It is one of three tiny bones in the middle ear that convey sound from the outer ear to the inner ear.
2. Fingers
Explanation:
Help pls. Are they a pure substance or mixture?
Answers
Answer:
Pizza is difintly a mixture the other i have no idea..im pretty sure CO2 is a substance btw im sorry I wish I could help more Hope this helps! :)
Explanation:
Answer:
Mixture
?
Pure
Pure
Pure
Pure
Mixture
Mixture
Pure
Pure
Mixture
Pure
Explanation:The answers are on google. Im not sure what they mean by hunter.
Loops of glowing hydrogen seen hanging over the solar limb during totality are:
a. flares.
b. haloes.
c. prominences.
d. filaments.
e. solar rainbows.
Answers
The loops of glowing hydrogen seen hanging over the solar limb during totality are:
c. Prominences.
Prominences are large, bright structures that extend outward from the Sun's surface into its outer atmosphere, known as the corona. They are often observed during a total solar eclipse when the Moon passes between the Earth and the Sun, blocking the direct sunlight and revealing the fainter features of the solar atmosphere.
Prominences are made up of ionized gases, primarily hydrogen, which emit light at specific wavelengths. They can take on various shapes and sizes, ranging from small, compact structures to enormous loops that extend for hundreds of thousands of kilometers above the solar surface. These loops are often seen as reddish or pinkish in color due to the emission of hydrogen alpha (Hα) spectral line.
Unlike flares, which are sudden and explosive releases of energy from the Sun, prominences are more stable and can persist for several days or even weeks. They are often anchored to regions of intense magnetic activity on the Sun's surface, and their formation and dynamics are closely related to the complex interplay of magnetic fields in the solar atmosphere.
Therefore, the loops of glowing hydrogen seen hanging over the solar limb during totality are known as prominences, which are large, bright structures extending from the Sun's surface into the corona.
To know more about solar limb here
https://brainly.com/question/29232120
#SPJ4
is the moon bigger than neptune
Answers
Answer:
Neptune is bigger than the moon
Explanation:
The circumference of the moon is 6,783.5 miles
The circumference of Neptune is 96,129 miles
This means neptunes circumference is about 14 times the size of the moons
You want to design a cylindrical cup that can hold 100ml co ee. to minimize the material to be used, you decide to minimize the surface area. what is the radius and height of the optimal cup?
Answers
The optimal dimensions for the cylindrical cup are approximately a radius of 1.918 cm and a height of 3.836 cm.
To design an optimal cylindrical cup with a volume of 100 ml and minimized surface area, you'll need to apply calculus to find the dimensions. First, let's convert the volume to cubic centimeters (1 ml = 1 cm³) and set up the equations.
Volume (V) of a cylinder: V = πr²h, where r is the radius and h is the height.
Surface area (A) of a cylinder: A = 2πrh + 2πr².
Given V = 100 cm³, we can express h in terms of r: h = 100/(πr²).
Now substitute this expression for h in the surface area equation:
A(r) = 2πr(100/(πr²)) + 2πr² = 200/r + 2πr².
To find the optimal radius, minimize A(r) by taking its derivative with respect to r and setting it equal to 0:
dA/dr = -200/r² + 4πr = 0.
Solve for r:
4πr³ = 200, so r³ = 50/π, and r ≈ 1.918 cm.
Now find the height using h = 100/(πr²):
h ≈ 100/(π(1.918²)) ≈ 3.836 cm.
So, the optimal dimensions for the cylindrical cup are approximately a radius of 1.918 cm and a height of 3.836 cm.
To learn more about radius, refer below:
https://brainly.com/question/13449316
#SPJ11
what is the study of acid-base chemistry called in the environment
Answers
Answer:
An acid is a substance that donates protons (in the Brønsted-Lowry definition) or accepts a pair of valence electrons to form a bond (in the Lewis definition). A base is a substance that can accept protons or donate a pair of valence electrons to form a bond. Bases can be thought of as the chemical opposite of acids.
Isotope problem help me
Answers
Answer:
59 Sc 0
21
tiene numero atomico 21, porque es neutro, y tiene numero masico 59 porque 21 + 28 =59
Identify the gas law that applies to the following scenario: an inflated balloon is placed in the freezer for 60 minutes. when the balloon is removed, it is
smaller in size
avogadro's law
gay-lussac's law
charles law
o boyle's law
Answers
Boyle's Rule, A balloon serves as an illustration of Boyle's rule in action. The balloon is inflated with air, and as the air pressure presses on the rubber, the balloon expands.
In a balloon that has been placed in a freezer, which of the following gas laws is in effect?Charles's law can be observed in action in a gas thermometer, which uses a gas's volume change to show a change in temperature. It can also be observed more practically by freezing a balloon containing gas and seeing the balloon's volume decrease.
What happens to a balloon's volume when it is placed in a freezer?Because the average kinetic energy of the gas molecules in a balloon drops as the temperature rises, the frozen balloon shrank. Due to this, the molecules move more slowly and encounter the interior walls of objects less frequently and with weaker force.
to know more about Boyle's law here:
brainly.com/question/1437490
#SPJ4
the acid dissociation constant, ka, of acetic acid is 1.8 x 10-5. what is the pka of this acid?
Answers
Answer: approximately 4.74pKa is when you take the -log10 of your Ka. Therefore, taking the -log10(1.8*10-5), we get a value of approximately 4.74 for our pKa for acetic acid.
Explanation: hope this helps
The pKa of this acid is mathematically given as
pKa=4.74
What is the pka of this acid?Question Parameter(s):
The acid dissociation constant, ka, of acetic acid is 1.8 x 10-5
Generally, the equation for the pKa is mathematically given as
pKa=-log( Ka).
Therefore
pKa=-log10(1.8*10-5)
pKa=4.74
In conclusion, the pKa of this acid
pKa=4.74
Read more about Solubility
https://brainly.com/question/23946616
What the anode , cathode and the electrolyte of a cell tha t you might use to electrolyte a spoon made from iron with silver?
Answers
The silver coating on the spoon is produced. When electrolyzing a spoon made from iron with silver, the anode, cathode, and electrolyte that can be used are as follows:
Anode: The anode is a negatively charged electrode, usually made of metal or graphite, that releases electrons during electrolysis. It is made of pure silver.Cathode: The cathode is a positively charged electrode that receives electrons during electrolysis. It is made of iron.Electrolyte: The electrolyte is a solution that conducts electricity and contains ions that can be reduced or oxidized. The electrolyte used for this process is a solution of silver nitrate (AgNO3) in water.The silver ion (Ag+) moves from the anode to the cathode through the electrolyte. At the cathode, it accepts an electron, reducing it to metallic silver (Ag). Fe(s) is oxidized to Fe2+(aq) ion at the anode, while Ag+ ions are reduced to Ag(s) at the cathode. Therefore, the silver coating on the spoon is produced.For such more questions on silver coating
https://brainly.com/question/29736740
#SPJ8
A student measures out 5 mL of calcium chloride solution into a small container and 5 mL of sodium carbonate solution in another small container. The total mass of both chemicals and the containers they are in is 15.5 g. When the student combined the two clear liquids, a gooey, cloudy precipitate formed. What would the total mass of the products and the two containers be after this reaction took place?
Answers
Answer:
15.5g
Explanation:
"The total mass of both chemicals and the containers they are in is 15.5 g." After a chemical reaction, by conservation of mass, the total mass of the products and the two containers after reaction is the same at 15.5g.
Answer:
15.5
Explanation:
in a chemical reaction, mass is conserved
so mass after reaction = mass before reaction = 15.5 g
7.70 mol of a monatomic ideal gas, kept at the constant pressure 1.62E+5 Pa, absorbs 3870 J of heat. If the change in internal energy is zero and this process occurs with a change in temperature 24.2 °C, How much did the volume of the gas change during this process?
Answers
The volume of the gas changed by approximately 0.280 m³ during the process.
To find the change in volume of the gas during the process, we can use the equation:
ΔQ = nCvΔT
where: ΔQ is the heat absorbed (3870 J),
n is the number of moles of the gas (7.70 mol),
Cv is the molar heat capacity at constant volume,
ΔT is the change in temperature (24.2 °C = 24.2 K).
Since the change in internal energy is zero (ΔU = 0), we know that ΔU = ΔQ + ΔW, where ΔW is the work done by the gas. In this case, since the process is at constant pressure, we can write ΔW = PΔV, where P is the pressure (1.62E+5 Pa) and ΔV is the change in volume.
Now, using the ideal gas law, we can express ΔV in terms of ΔT:
ΔV = (nRΔT) / P
where R is the ideal gas constant (8.314 J/(mol·K)).
Substituting the given values into the equations:
ΔQ = nCvΔT
3870 J = 7.70 mol × Cv × 24.2 K
From the equation ΔV = (nRΔT) / P, we have:
ΔV = (7.70 mol × 8.314 J/(mol·K) × 24.2 K) / (1.62E+5 Pa)
Simplifying the equations and performing the calculations:
ΔQ = nCvΔT
3870 J = 7.70 mol × Cv × 24.2 K
Cv ≈ 2.00 J/(mol·K) (calculated from the above equation)
ΔV = (7.70 mol × 8.314 J/(mol·K) × 24.2 K) / (1.62E+5 Pa)
ΔV ≈ 0.280 m³
Therefore, the volume of the gas changed by approximately 0.280 m³ during this process.
Read more on internal energy here: https://brainly.com/question/29546504
#SPJ11
urgent please help!!!!
Answers
Answer:
calcium trioxonitrate(v)oxides
sodium trioxonitrate (v)oxides
lithium tetraphosphate(vi)oxides
barium cynides
aluminium tetrasulphate(vi)oxides
potassium hydroxide
zinc sulphide
silver chloride
The active site of chymotrypsin is made up of Choose one:
O Asp 102 and His57 from the A chain and Ser 195 from the C chain.
O Asp 102 and Ser195 from the B chain and His57 from the C chain.
O Asp 102 and His57 from the A chain and Ser195 from the B chain.
O Asp 102 and His57 from the B chain and Ser195 from the C chain.
Answers
Enzyme Active Sites and their Reaction Mechanisms, Harry Morrison, 2021 α - The "hydrolytic enzyme" chymotrypsin (EC 3.4.21.1; chymotrypsinogen .
A) belongs to the superfamily of serine proteases and hydrolyzes peptide bonds by using a serine hydroxyl group as a nucleophile in the active site. The pancreas is where chymotrypsin is largely made. To stop its protease activity from dissolving the pancreas, it is created as the inactive zymogen chymotrypsinogen rather than the active version. A different enzyme known as trypsin changes it into its active form when it is secreted into the lumen of the small intestine.
Trypsin is the primary enzyme that breaks down chymotrypsin, which is also known as chymotrypsinogen. Active enzymes can occasionally even cleave the incoming inactive form of themselves.
To learn more about chymotrypsin please click on below link
https://brainly.com/question/13638833
#SPJ4
Which of the following statements best describes the cell condition that supports Na+ sequestration in the vacuole?
A. Na+ sequestration can occur if the concentration of protons (H+) in the cytoplasm is greater than the concentration of protons (H+) in the vacuole.
B. Na+ sequestration can occur if the concentration of protons (H+) in the cytoplasm is less than the concentration of protons (H+) in the vacuole.
C. Na+ sequestration can occur if the concentration of protons (H+) in the cytoplasm is equal to the concentration of protons (H+) in the vacuole.
Answers
The statement that best describes the cell condition supporting Na+ sequestration in the vacuole is option B: Na+ sequestration can occur if the concentration of protons (H+) in the cytoplasm is less than the concentration of protons (H+) in the vacuole.
Option B accurately describes the condition that enables Na+ sequestration in the vacuole. In plant cells, the vacuole plays a crucial role in ion homeostasis by actively transporting ions such as Na+ into its lumen, maintaining a lower concentration of Na+ in the cytoplasm compared to the vacuole.
This sequestration process relies on proton pumps present in the vacuolar membrane, which actively transport protons (H+) from the cytoplasm into the vacuole, creating an electrochemical gradient. The higher concentration of protons (H+) in the vacuole creates an electrochemical potential that facilitates the uptake of Na+ ions.
By maintaining a lower concentration of protons (H+) in the cytoplasm relative to the vacuole, the cell can drive Na+ ions into the vacuole against their concentration gradient, effectively sequestering them and preventing their accumulation in the cytoplasm.
Learn more about vacuole
brainly.com/question/32997273
#SPJ11
DNA would be found within which classification of biological molecules?
proteins
lipids
nucleic acids
carbohydrates
Answers
Answer:
Nucleic acids
Answer:
Nucleic acids is the correct answer hope it helps
Energy appears in many forms what form of energy is lightning
Answers
Answer:
thermal and light energy
Balance the following equations
14)__C₂H4 +___O₂ ->_CO₂ +
15)___NaHCO3 -> Na₂CO3 +
16)__ _Cl₂ +
_Cl₂ +_NaBr ->
17)____Na₂S +
NaCl +
H₂O
H₂O + CO₂
Br2
HCI->_NaCl + H₂S
Answers
The balanced chemical equations are as follows:
14. C₂H₄ + 3 O₂ -> 2CO₂ + 2H₂O
15. 2NaHCO₃ -> Na₂CO₃ + H₂O + CO₂
16. 3Cl₂ + 2NaBr -> 2NaCl + Br₂
17. 3Na₂S + 2NaCl + 3H₂O -> 5NaCl + H₂S + 3O₂
What are balanced equations?Balanced equations are equations of chemical reactions that ensure that the law of conservation of mass is true.
In a balanced equation, the number of atoms of each element on both sides of the equation is equal.
The given chemical equations are balanced as follows;
14. Place 3, 2, and 2 before O₂, CO₂, and H₂O respectively.
C₂H₄ + 3 O₂ -> 2 CO₂ + 2 H₂O
15. Place 2 in front of NaHCO₃.
2 NaHCO₃ -> Na₂CO₃ + H₂O + CO₂
16. Place 3, 2, and 2 in front of Cl₂, NaBr, and NaCl respectively.
3Cl₂ + 2NaBr -> 2NaCl + Br₂
17. Place 3, 2, 3, 5, and 3 in front of Na₂S, NaCl, H₂O, NaCl, and O₂ respectively.
3Na₂S + 2NaCl + 3H₂O -> 5NaCl + H₂S + 3O₂
Learn more about balancing equations at: https://brainly.com/question/11904811
#SPJ1
on its website, the epa claims that sulfur dioxide levels have fallen by 85% between 1990 and 2016. calculate the percent decrease between these two years to determine whether this claim accurate.
Answers
The EPA's claim that sulfur dioxide levels have fallen by 85% between 1990 and 2016 is accurate based on the calculation of the percent decrease.
To determine whether the EPA's claim about the decrease in sulfur dioxide levels is accurate, we can calculate the percent decrease between 1990 and 2016.
Step 1: Find the difference between the initial and final values.
The initial value in 1990 is 100% (the entire amount of sulfur dioxide levels).
The final value in 2016 is 15% (85% decrease from the initial value).
Step 2: Calculate the percent decrease.
To find the percent decrease, we subtract the final value from the initial value and then divide the result by the initial value. Finally, we multiply by 100 to express the decrease as a percentage.
Percent decrease = [(Initial value - Final value) / Initial value] * 100
Percent decrease = [(100 - 15) / 100] * 100
Percent decrease = (85 / 100) * 100
Percent decrease = 85%
Therefore, the calculated percent decrease between 1990 and 2016 is 85%, which matches the EPA's claim. The claim is accurate as the percent decrease aligns with the EPA's statement that sulfur dioxide levels have fallen by 85% during this time period.
To know more about sulfur dioxide visit:-
https://brainly.com/question/9720549
#SPJ11
Calculate the maximum concentration (in m) of silver ions (ag ) in a solution that contains of co32-. the ksp of ag2co3 is
Answers
Acetylcholinesterase equilibrium equation is Ag2CO3(s) <---> 2 Ag+(aq) + CO32-(aq)
What is Acetylcholinesterase ?Following the transmission of information between two nerve cells or neurons, the neurotransmitter acetylcholine is hydrolyzed by the enzyme acetylcholine esterase. Choline and acetate result from the breakdown of acetylcholine (also called acetic acid). Acetate will permeate the presynaptic cell's membrane and choline will travel through it to allow for the reuse of the components.
In order for a muscle cell to contract, acetylcholine transmits a signal from a nerve cell to its receptors. A breakdown of the acetylcholine is then performed to prevent misunderstanding with brand-new neurotransmitters.
Due to their potent acetylcholinesterase inhibitory properties (see parasympathomimetic), many nerve agents and neurotoxins have the ability to constantly induce the contraction of muscle cells. This can cause death when consumed in big numbers.
To learn more about Acetylcholinesterase from he given link:
https://brainly.com/question/6148688
#SPJ4
The total number of electrons in a neutral atom of every element is always equal to the atom's
A) mass number
B) number of protons
C) number of neutrons
D) number of atomic particles
Answers
Answer:
Number of Protons
Explanation:
The number of Protons is always equivalent to the amount of electrons that are on the outside of the atom
What is the minimum number of kiloJoules needed to change 40.0 grams of water at 100C to steam at the same temperature and pressure
Answers
Answer:
90.4Kg
Explanation:
The energy required= latent heat of vaporization
Latent heat of vaporization of water= 2260 KJ/Kg
Mass of water = 0.04 Kg
Heat required= 0.04Kg× 2260 KJ/Kg
Heat required= 90.4Kg
Answer: The minimum number of kilo Joules needed is 90.4KJ.
Explanation:
The energy required= latent heat of vaporization.
Latent heat of vaporization of water= 2260 KJ/Kg
Mass of water = 0.04 Kg
Heat required= 0.04Kg× 2260 KJ/Kg
Heat required= 90.4KJ.
Learn more: https://brainly.com/question/2477358
if the theoretical yield for a reaction is 54.9 g and 51.3 g of product are actually obtained, the percent yield is a) 0.934%. b) 93.4%. c) 107%. d) 3.60%. e) not enough information given
Answers
The theoretical yield for a reaction is 54.9 g and 51.3 g of product are actually obtained, the percent yield is a 93.4, option (b) is correct.
What is reaction?
One or more chemicals, sometimes referred to as reactants, are changed into one or more new substances, referred to as products, during a chemical reaction.
What is product?
Upon completion of a chemical reaction, a substance is said to be a product. The zinc and sulfur reactants in the equation above mix chemically to create the zinc sulfide product.
% yield = (actual yield/ theoretical yield ) X 100
= ( 51.3/54.9 ) X 100
= 93.4
Therefore, the theoretical yield for a reaction is 54.9 g and 51.3 g of product are actually obtained, the percent yield is a 93.4, option (b) is correct.
Learn more about reactions from the given link.
https://brainly.com/question/1893305
#SPJ4
Determine if the following reaction is a redox reaction. Use evidence from the equation to explain your reasoning.
Answers
A redox reaction is a chemical reaction in which one or more of the reacting species undergoes oxidation and one or more undergoes reduction. An oxidizing agent is an element or compound that oxidizes another substance, while a reducing agent is an element or compound that reduces another substance.
The following reaction is a redox reaction based on the following evidence: 2Al + 3FeO → Al2O3 + 3Fe2+ In this reaction, Fe is being reduced because the FeO is changing to Fe2+. Additionally, the Al is being oxidized because it is losing electrons and forming Al2O3. Therefore, the reaction is a redox reaction. Let us take a look at the oxidation state of the elements in the given equation. Oxidation state of Al: (2) for the reactant and (3+) for the product. Oxidation state of Fe: (2+) for the reactant and (2+) for the product. Oxidation state of O: (-2) for the reactant and (-2) for the product. We can tell that oxidation is happening because of the increase in the oxidation state of Al from 2 to 3+. We can tell that reduction is happening because of the decrease in the oxidation state of Fe from 2+ to 2. As a result, the given equation is a redox reaction.For such more question on oxidizes
https://brainly.com/question/14041413
#SPJ8
Sickle-cell anemia is a genetic disease that causes red blood cells to have an odd shape. The odd shape prevents the blood cells from carrying as much oxygen as they should. What is the most likely cause for this disease?
Answers
"Normal red blood cells are rounded and disk-shaped. In sickle cell anemia, some red blood cells become deformed, so they look like sickles used to cut wheat. These unusually shaped cells give the disease its name. Sickle cell anemia is one of a group of disorders known as sickle cell disease."
A solution is formed by adding 35 g of ammonium nitrate to 250 g of water. what is the percent by mass of ammonium nitrate?
Answers
\(\\ \sf\longmapsto Mass\%=\dfrac{Mass\;of\:solute}{Mass\:of\:solvent}\times 100\)
\(\\ \sf\longmapsto Mass\%=\dfrac{35}{250}\times 100\)
\(\\ \sf\longmapsto Mass\%=\dfrac{7}{50}\times 100\)
\(\\ \sf\longmapsto Mass\%=7(2)=14\%\)
they are located between each of the atrium and ventricle to prevent blood from flowing backwards, what is it?
Answers
How many atoms are in 3.42 moles of agno3
Answers
Answer
2.06x 10²⁴ atoms
Procedure
To calculate the atoms in a molecule we will need to multiply the moles by Avogadro's number 6.0221408 x 10²³.
\(3.42\text{ mol AgNO}_3\frac{6.0221408\times10^{23}\text{ atoms AgNO}_3}{1\text{ mol AgNO}_3}=2.0596\times10^{24}\text{ atoms AgNO}_3\)The process due to which a solid directly changes into its vapours.
Help please
Answers
Answer:
Sublimation
Explanation: