In order to prevent or delay the onset of rancidity brought on by oxidation, antioxidants are frequently utilized as preservatives in foods that contain fat. Ascorbic acid (vitamin C) and tocopherols are examples of natural antioxidants (vitamin E).
Which of the following is a typical preservative used to prevent the emergence of off flavors, smells, and color changes?Additionally, nitrite helps cured meat take on flavor and color while delaying the onset of rancidity, off flavors, and off odors during storage. The characteristic pink hue of cured meats is brought on by nitrite.
In this quiz, you'll learn how to define the process of a material mixing with oxygen?a chemical reaction in which an object combines with oxygen; electrons are lost in oxidation processes.
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Express Ksp in terms of molar solubility, x, for a salt with a formula of
AB(s) K_sp =
AB2(s) K_sp =
AB(s) K_sp =
A3Bz(s) K_sp =
The solubility product is the equilibrium constant for the dissolution in a substance.
We know that the molar solubility of the salt x
For the salt AB(s) ⇄ A^+(aq) + B^-(aq)
[ A^+] = [B^-] = x
Ksp = [ A^+] [B^-] = x^2
For the salt AB2(s) ⇄ A^+(aq) + 2B^-(aq)
Ksp = [ A^+] [2B^-]^2 = [ x] [2x]^2 =4x^3
For the salt AB3(s) ⇄ A^+(aq) + 3B^-(aq)
Ksp = [ A^+] [3B^-]^3 = [ x] [3x]^3 = 27x^4
For the salt A3B2(s) ⇄ A^+(aq) + 3B^-(aq)
Ksp = [ 3A^+] [2B^-]^3 = [ 3x]^3 [2x]^2 = 108x^5
What is equilibrium constant?
The equilibrium constant of a chemical reaction is the value of its reaction quotient at chemical equilibrium, the state to which a dynamic chemical system approaches after a sufficient period of time when its composition has no measurable tendency to change further.To know more about equilibrium constant, click the link given below:
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Which statement best describes why most individual organisms never fossilized?(1 point)
Only organisms that lived in the ocean fossilize.
Conditions for fossilization are rare.
Chemicals that fossilize organisms are rare.
Only organisms with hard parts fossilize.
The statement which best describes why most individual organisms never fossilized is that Conditions for fossilization are rare.
What is fossilization?Fossilization is a term which ia defined as the mechanisms which are chemical, physical, and biological which results in the preservation for long term of animals and plants renants. Fossilization is a type of negative representation of the creatures which is preserved in the substrates as fossil.
Reason for lack of decomposition of fossilizationThe reason for the lack of these fossilized parts can be explained as these parts quickly decompose.
The process of the recycling nutrients which have been consumed by an organism which is used to create its body begins with decomposition.Thus, we concluded that the statement which best describes why most individual organisms never fossilized is that Conditions for fossilization are rare.
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188.0 mL of 0.400 M HNO3 is added to 133.4 mL of NaOH of unknown
concentration.
The 188.0 mL of 0.400 M HNO3 is added to 133.4 mL of NaOH of unknown concentration. 0.564 M is the answer HNO3 (aq) + NaOH (aq) ---> H2O(l) + NaNO3 (aq).
What is concentration?
Concentration is the act of focusing all of one's attention on a particular object, task, or activity. It is a key mental skill that is necessary for achieving goals, making decisions, and solving problems. Concentration requires self-discipline and the ability to block out distractions. When concentration is successful, it can help individuals to become more productive and successful in their daily lives.
By using stock to working solution equation
M1V1 = M2V2
188.0 x 0.400 = M2 X 133.4
Where,
M1 = Molar concentration of stock solution 1.
V1 = volume of stock solution 1
M2 = molar concentration of unknown solution
V2 = volume of unknown solution.
Now, we find out the concentration of unknown solution
188.0 x 0.400 = M2 X 133.4
188.0 x 0.400/133.4 = M2
0.564 M = M2 is the correct answer.
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draw an alcohol and an alkyl bromide that could be combined to give the ether shown. an alkyl bromide and alcohol combine to form an ether. the ether is an oxygen bonded to a 6 carbon ring and isopropyl group. draw the alkyl bromide. draw the alcohol.
The product isopropoxycyclonehexane (ether) can be obtained from the following reaction of bromocyclohexane with 2-propanol in the presence of strong base
bromocyclohexane + 2-propanol ----(NaH/SN2) ---> isopropoxycyclonehexane
This occurs due to the strong base and the SN2 reaction.
Mechanism:
The strong base, sodium hydride abstracts a proton from 2-propanol to form an anion. This anion reacts with bromocyclohexane by SN2 mechanism to form isopropoxycyclonehexane.
Substitution reactions are those reactions in which one functional group is replaced by another functional group.
Two types of substitution reactions can occur in haloalkanes: SN1 and SN2.
Thus, the SN2 substitution reaction, in which the halogen is released from the haloalkane, and the nucleophile attacks the carbon's positive charge. SN2 in which the nucleophile attacks the halogen's carbon, causing the halogen to be replaced in which nucleophile attack.
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1. silicon is a(n) 2. the smallest piece of silicon still retaining the characteristics of silicon is called a(n) 3. silica is a(n) 4. the smallest piece of silica still retaining the characteristics of silica is called a(n) 5. quartz is a(n) 6. granite is a(n) 7. elements are defined based on the number of 8. in general, an unbalanced atom is called a(n) 9. specifically, an atom that has gained electrons is called a(n)
The overall charge of an ion is determined by how many electrons it has gained or lost. A negative overall charge results from an atom gaining electrons.
When electrons are obtained, what happens?Atoms that lose an electron change into positive ions, often known as cations. Atoms transform into negative ions, or anions, when they pick up electrons.
How are the acquired electrons located?If the charge is negative, the atomic number is increased by the charge. If it's negative, the ion has picked up electrons. The total number of electrons can be calculated by multiplying the atomic number by the charge. Protons are less numerous than electrons in this instance.
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what volume of a 0.125 m hydrobromic acid solution is required to neutralize 29.5 ml of a 0.126 m barium hydroxide solution?
The molarity of barium hydroxide solution is 0.2145 M .
What is molarity?
The proportion of solute moles to solution length is called molarity. Divide the number of moles of HCl by the volume (L) of the solution in which it was dissolved to get the molarity of the acid solution.
What is barium hydroxide ?
Ba(OH)2 is the chemical formula for barium hydroxide, often known as baryta. The powder is an odourless, transparent white colour. The nature of it is toxic. It is ionic in nature; for instance, barium hydroxide, Ba(OH)2, can produce two hydroxide ions per molecule when dissolved in water.
M1*V1 = M2*V2
a.) M1*27.6 /1000 = 0.176*20.5/1000
M1 = 0.1307
b.) M1*19/1000 = 0.154*23.9/1000
M1 = 0.1937
c.) 0.119*24.7 = 2*M2*13.7
M2 = 0.10727
a) molarity of the hydrochloric acid solution = ( volume of base * molarity of base) / ( volume of acid ) = ( 20.5 * 0.176) / (27.6) = 0.1307 M
b) molarity of the hydrochloric acid solution = ( volume of base * molarity of base) / ( volume of acid ) = ( 23.9 * 0.154 / (19) = 0.19371 M
c) molarity of barium hydroxide solution = ( volume of acid * molarity of acid) / ( volume of base ) = ( 24.7 * 0.119) / (13.7) = 0.2145 M
Therefore, molarity of barium hydroxide solution is 0.2145 M .
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complete the given reaction which is part of the electron transport chain. the abbreviation q represents coenzyme q. use this abbreviation for the product.
The given reaction which is part of the electron transport chain. the abbreviation q represents coenzyme q. use this abbreviation for the product is FADH₂ + Q --> FAD + QH₂
The complete reaction for the electron transport chain is given as follows :
FADH₂ + Q --> FAD + QH₂
in this reaction the reactant coenzyme Q is donating the electron and acts as a oxidizing agent and itself reduce. while FADH₂ is oxidized and it acts as a reducing agent. as we know the loss of the electron is called as oxidation and the gain of the electrons is called as the reduction.
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Which of the following is a carbon sink?
A. Humans
B.Oceans
C.Burning fossil fuels
D.Livestock
Answer:
B.Oceans
Explanation:
Carbon is stored on our planet in the following major sinks (1) as organic molecules in living and dead organisms found in the biosphere; (2) as the gas carbon dioxide in the atmosphere; (3) as organic matter in soils; (4) in the lithosphere as fossil fuels and sedimentary rock deposits such as limestone, dolomite and ...
The ocean soil and also forests are one of the worlds largest carbon sinks
so the answer is B.Oceans
How do you predict polar covalent bonds?
A polar covalent bond is when atoms with different electronegativities share electrons in a covalent bond.
In polar covalent bonds, the molecules with some polarity will be formed.
for example HCl.
HCl is polar covalent compound as the chloride ion is more electronegative than hydrogen ion.
Covalent character is shown by HCl as the atoms of hydrogen and chlorine share their electrons with each other.
Chloride ion carries partial negative character whereas, hydrogen carries partial positive character.
Also, water molecule is a polar covalent molecule.
It is made up of 2 hydrogen atoms and one oxygen.
The electrons are unequally shared, as oxygen atom spending more time with electrons than the hydrogen atoms due to the electronegativity difference of atoms.
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were there any observed color changes during the course of your diels-alder reaction? based purely upon this observation and the color of your isolated product, were you successful in isolating hexaphenylbenzene or dimethyl-3,4,5,6-tetraphenylphthalate?
No, there were no observed color changes during the Diels-Alder reaction and isolation of the products hexaphenylbenzene or dimethyl-3,4,5,6-tetraphenylphthalate were not able to be done.
Based on the color of the isolated product, it is not possible to determine whether the reaction was successful in isolating hexaphenylbenzene or dimethyl-3,4,5,6-tetraphenylphthalate. This is because these two compounds have very similar colors, both being yellow solids.
The isolated product was a yellow solid. Based on this observation, it is not possible to determine whether hexaphenylbenzene or dimethyl-3,4,5,6-tetraphenylphthalate was isolated. Both compounds are yellow solids and the color of the product does not provide enough information to determine which was isolated. To accurately identify the product, additional analytical techniques such as NMR or IR spectroscopy should be used.
To conclusively determine which compound was produced, it would be necessary to perform a chemical analysis of the product. This could include techniques such as spectroscopy, chromatography, or melting point analysis.
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answer the following regarding the six criteria pollutants: (5)a. what are common sources of the pollutants? (5)b. what limits have been established for these pollutant in ambient air under naaqs? (20)c. briefly describe the control techniques for each of the six pollutants?
Common sources of the pollutant are factories. The control techniques for each of the six pollutants.
People can be exposed to dangerous air pollutant that pose health risks in a variety of ways, including ingesting contaminated air. consuming contaminated foods, such as tainted meat, milk, or eggs, contaminated produce grown in polluted soil where air toxics have been deposited, and infected fruits and vegetables. contaminated water from dangerous air pollution, Consuming poisonous soil. Young children are especially vulnerable since they regularly put objects in their mouths or absorb soil from their hands. Exposing your skin to contaminated dirt, dust, or water (for example, during recreational use of contaminated water bodies). The two primary categories of pollution sources are point sources and nonpoint sources. Point sources—small, distinguishable sources of pollution—include factories, mines, power plants, refineries, and wastewater treatment facilities. Nonpoint sources are those that are distributed over a wide geographic area, such a watershed. Nonpoint sources can also include mobility sources like cars, buses, and trains. While each of these are single point sources, their total effects are spread across a vast area because they are all moving.
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What elements does bromine react with?
With many of the metals and elements, anhydrous bromine is less reactive than wet bromine; however, dry bromine reacts vigorously with aluminium, titanium, mercury as well as alkaline earth metals and alkaline metals.
Bromine is the only liquid nonmetallic element at room temperature and one of five elements on the period table that are liquid at or close to room temperature. The pure chemical element has the physical form of a diatomic molecule, Br2.
It is a heavy, mobile, reddish-brown liquid, that evaporates easily at standard temperature and pressures in a red vapor (its colour resembles nitrogen dioxide) that has a strong disagreeable odour resembling that of chlorine. A halogen, bromine resembles chlorine chemically but is less active. It is more active than iodine, however. Bromine is slightly soluble in water, and highly soluble in carbon disulfide, aliphatic alcohols (such as methanol), and acetic acid. It bonds easily with many elements and has a strong bleaching action.
Bromine is highly reactive and is a powerful oxidizing agent in the presence of water. It reacts vigorously with amines, alkenes and phenols as well as aliphatic and aromatic hydrocarbons, ketones and acids (these are brominated by either addition or substitution reactions).
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nitrogen monoxide is produced by combustion in an automobile engine. what volume of nitrogen dioxide is produced when 12.0 liters of nitrogen monoxide react according to the following reaction? (all gases are at the same temperature and pressure.)
41.2 litres of Nitrogen dioxide will be produced.
28.9g NO x (1 mol NO / 30.01g NO) = 0.963 mol NO
0.963 mol NO x (1 mol O2 / 1 mol NO) = 0.963 mol O2
0.963 mol O2 x (31.98g O2 / 1 mol O2) = 30.8g O2
30.8 grams of oxygen gas are required for the complete reaction of the 28.9 grams of nitrogen monoxide.
Charles' law states that the volume of a given gas sample under constant pressure is precisely proportional to its absolute temperature. Boyle's law states that, for a given amount of gas and constant temperature, the volume is inversely proportional to the pressure.
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Classify the following phase changes as endothermic or exothermic.
1) liquid to solid
2) solid to liquid
3) gas to liquid
4) solid to gas
5) liquid to gas
6) gas to solid
1)liquid to solid-exothermic process
2) solid to liquid-endothermic process
3) gas to liquid-exothermic process
4) solid to gas-endothermic process
5) liquid to gas-endothermic process
6) gas to solid-exothermic process
Exothermic Reaction -It refers to a transformation in which a closed system releases energy (heat) to its surroundings, as expressed by. When the transformation occurs at constant pressure and without the exchange of electrical energy, heat Q equals the enthalpy change.
Exothermic reactions are those that produce energy. When bonds are formed in the products, more energy is released than is used to break the bonds in the reactants in exothermic reactions. Endothermic reactions are those that absorb (or use) energy.
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. saccharin (c7h5no3s) is sometimes dispensed in tablet form. ten tablets with a total mass of 0.5894 g were dissolved in water. this solution was then oxidized to convert all the sulfur to sulfate ion, which was precipitated by adding an excess of barium chloride solution. the mass of baso4 obtained was 0.5032 g. what is the average mass of saccharin per tablet? what is the average mass percent of saccharin in the tablets?
The moles are literally the molar mass of a solute and has the moles of solute and solvent of this solution as the average mass percent of saccharin in the tablets is 69%.
The sulfur (S) is oxidized to sulfate ions (SO₄²⁻). All the SO₄²⁻ ions are brought about with BaCl₂ answer withinside the shape of BaSO₄ (s).
The response is as follows-
BaCl₂ (aq) + SO₄²⁻ (aq) → BaSO₄ (s) + 2Cl⁻So, this shows that after 1 mol of Saccharin (C₇H₅NO₃S) is dissolved, then 1 mol of BaSO₄ is brought about.The quantity of moles of C₇H₅NO₃S is same to the quantity of moles of BaSO₄.The quantity of moles of BaSO₄ = (mass of BaSO₄ obtained) / (molecular mass of BaSO₄) = (0.5032 g) / (233.39 g/mol) = 0.0022 molesSo, The quantity of moles of C₇H₅NO₃S = 0.0022 molesMass of Saccharin (C₇H₅NO₃S) = (quantity of moles of C₇H₅NO₃S) × (molecular mass of C₇H₅NO₃S) = (0.0022 moles) × (183.18 g/mol) = 0.403 gThe common mass percent of Saccharin (C₇H₅NO₃S) in drugs may be decided by-[(mass of C₇H₅NO₃S) / (mass of tablets)] × 100 % = [ (0.403 g) / (0.5894 g) ] × 100 % = 68.37 %68.37n be rounded off as 69 %So, the common mass percent of Saccharin (C₇H₅NO₃S) in drugs is 69 %.Read more about mass;
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If the bond angle between two adjacent hybrid orbitals is 120°, which is the hybridization?
a. sp3d2
b. sp
c. sp3
d. sp2
The bond angle between two adjacent hybrid orbitals is 120°, the hybridization is d. sp2.
The new set of hybrid orbitals creates trigonal structures, growing a molecular geometry of a hundred and twenty degreesThe accurate solution is a hundred and twenty degree. The sp2 s p 2 hybridization corresponds to a trigonal planar geometry and the bond attitude for this geometry is a hundred and twenty degree.
The geometry of the sp2 hybrid orbitals is trigonal planar, with the lobes of the orbitals pointing in the direction of the corners of a triangle. The attitude among any of the hybrid orbital lobes is a hundred and twenty°.aggregate of s and p orbital fashioned in trigonal symmetry and is maintained at 1200.
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What is the only special sense in which signals can reach the cerebral cortex without passing first through the thalamus?
a. touch
b. smell
c. taste
d. vision
Smell is the only special sense in which signal reaches the cerebral cortex without passing first through the thalamus of the brain.
What is brain?
The brain is defined as a complex organ which is capable of controlling various actions like thinking, memory,emotions, touch , huger and every regulatory process of our body.
Brain along with the spinal cord make up the central nervous system.The average adult brain is made up of 60% of fat and remaining 40 % comprises of water, carbohydrates, proteins and salts.
It has blood vessels and nerves which include neurons and glial cells.
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A solution is saturated in co2 gas and kno3 at room temperature. What happens when the solution is warmed to 75oc?.
When a saturated solution is warmed to 75 degree C then the solubility of the solution decreases because the solubility of gas decreases with increase with temperature.
When a solution that contains the maximum amount of solute that can be dissolved under the condition at which the solution exists. This explains the saturated saturated solution. A solution can reach a status of saturation. When a solution is saturated with CO₂ gas and KNO₃ has its temperature increased above the room temperature to about 75°C the solubility of the gas CO₂ will decrease. because the solubility of gas in a solution decreases with an increase in temperature while the solubility of a solid increases with increase in temperature. A saturated solution is a chemical solution containing the maximum concentration of a solute dissolved in the solvent. The additional solute will not dissolve in a saturated solution.
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Pressure has little effect on the solubility of liquids and solids because they are almost incompressible. (True or False)
The given statement about pressure is true as per the Henry's law.
Liquids and solids showcase nearly no alternate of solubility with modifications in strain. Gases as is probably expected, growth in solubility with an growth in strain. Henry's Law states that: The solubility of a fueloline in a liquid is immediately proportional to the strain of that fueloline above the surface of the solution. External pressure has little or no impact at the solubility of drinks and solids. In contrast, the solubility of gases will increase because the partial stress of the fueloline above an answer will increase.
Therefore, the given statement is true.
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Hydrogen gas reacts with fluorine gas to produce hydrogen fluorine gas. Write the chemical equation.
The chemical equation [tex]H_2(g) + F_2(g)[/tex] → [tex]2HF(g)[/tex]
What is chemical equation?
Chemical equations are symbolic representations of chemical reactions that express the reactants and products in terms of their chemical formulae.
Each of the symbols of the associated reactants and products has a coefficient assigned to it. The coefficients of entities in a chemical equation are the exact value of that entity's stoichiometric number.
The symbol (s) represents a solid state entity.
The symbol (l) represents an entity's liquid condition.
The symbol (g) indicates that the entity is gaseous.
The chemical equation [tex]H_2(g) + F_2(g)[/tex] → [tex]2HF(g)[/tex]
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A pure substance which can only be separated into two or more simpler substances using chemical changes is called
A compound is a substance made up of two or more elements that have chemically joined and can only be broken down chemically into simpler compounds. For instance, pure water is a compound.
What are examples and content?Matter with a definite composition and set of characteristics is referred to as a substance. A substance is every pure element. It is a material when it is pure. Substance examples: Because iron is an element, it's also a substance. Methane is both a material and a compound.
Which material types are there?There are two different types of pure substances: elements and compounds. One particular type of atom makes up each element, whether it exists on its own or as part of a molecule. Compounds are molecules made up of two simpler things than molecules.
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Thermal energy moves from an area of. Matter to an area of matter
Answer:
Convection- the answer to the question
the hydrogen gas is collected over water at 25oc. the volume of gas is 246 ml measured at 1 atm. calculate the number of grams of na used in the reaction. (vapor pressure of water
The number of grams of Na used in the reaction is 0.44grams.
Which is mass?The amount of matter in an object is measured by its mass. The sum of an object's atoms, their density, and the types that make up those atoms together make up its mass.
Given information,
Molar mass = 22.99
2Na + 2H₂O ⟶ 2NaOH + H₂
P total = 1atm
PH₂O = 0.0313atm
T = 25°C
V = 246ml
The ideal gas law can be used to determine the moles of hydrogen,
pV = nRT
Determine the hydrogen partial pressure.
P total = PH₂+PH₂O
1 = PH₂ + 0.0313
PH₂ = 0.9687atm.
Calculate the volume in litres,
V = 246 mL = 0.246 L
Change the degree to kelvins,
T = (25.0 + 273.15) K = 298.15 K
Determine the hydrogen moles,
0.9687×0.246 = n × 0.08206×298.15
n = 0.2383/24.47
n = 0.009740 mol.
Moles of Na,
There is a 2 mol molar ratio. 1 mol Na: H2
Moles of Na = 0.009740 moles of H₂ × 2mol of Na/1 mol H₂
Moles of Na = 0.01948 mol.
Mass of Na = 0.01948 moles of Na × 22.99g of Na/1 mol of H₂
Mass of Na = 0.44grams.
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Complete question is " A piece of sodium metal reacts completely with water as follows: 2Na(s) + 2H2O(l) ⟶ 2NaOH(aq) + H2(g) The hydrogen gas generated is collected over water at 25.0°C. The volume of the gas is 246 mL measured at 1.00 atm. Calculate the number of grams of sodium used in the reaction. (Vapor pressure of water at 25°C = 0.0313 atm)".
which of the five basic geometries for molecules and ions has the largest bond angle? linear planar triangular tetrahedral square planar octahedral
The highest bond angles are seen in ions and linear molecules.
The Lewis electron-pair technique identifies which atoms have lone pairs of electrons and can be used to forecast the number and types of bonds that will exist between the atoms in a substance. The structures of many compounds and polyatomic ions with a central metal atom can also be predicted by the VSEPR model, as can the structures of practically any molecule or polyatomic ion with a central nonmetal atom. The foundation of the VSEPR theory is the idea that electron pairs in bonds and lone pairs reject one another and would, as a result, adopt a geometry that spreads them as far apart as feasible. The bond angles in linear geometry is 180deg while in planar triangular is 120deg, tetrahedral is 109.5deg, octahedral is 90deg.
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1) ATP is considered to be a high-energy molecule. When ATP undergoes hydrolysis to ADP, how much energy is produced?
ATP is considered to be a high-energy molecule. When ATP undergoes hydrolysis to ADP, how much energy is produced?
A) 7.3 kcal/mole is required.
B) 7.3 kcal/mole is released.
C) 21.9 kcal/mol is released.
D) 14.6 kcal/mole is released.
A 355 ml soda can is 6. 2 cm in diameter and has a mass of 20 g. Such a soda can half full of water is floating upright in water.
The length of the can which above the water level that has 6.2cm diameter and a mass of 20g is 5.22cm (using density of water 1000 kg/m^3)
What is density?It is the substance's mass per unit of volume. The symbol most often used for density is ρ and the value of water density that will be used at the question here is 1000 kg/m^3.
This question is incomplete, The complete question is as follows :
"A 355 ml soda can is 6. 2 cm in diameter and has a mass of 20 g. Such a soda can half full of water is floating upright in water. What length of the can is above the water level?"
How to calculate the length of the can which above the water level that has 20g as mass and 6.2cm as diameter (using 1000 kg/m^3 as density of water)?
V = volume of the can = 355ml = 0.355 L = 0.355 * 10^-3 m^3
r = radius of the can = d/2 = 0.062 / 2 = 0.031m
ρ = density of water = 1000 kg/m³
Mc = mass of the can = 20g = 0.020kg
m = mass of water inside can
= ρ * V / 2
= 1000 * (0.355 * 10^-3) / 2
m = 0.1775 kg
Now, let's use the equilibrium of force in vertical direction
Force of buoyancy = weight of can + weight of water inside the can
ρ * V * g - Mc * g + m*g
ρ * (π * r² * h) = Mc + m
1000 * 3.14 * 0.031² * h = 0.020 + 0.1775
3.01754 * h = 0.1975
h = 0.06545m
L = length of can
Volume of can is
V = π * r² * L
0.355 * 10^-3 = 3.14 * 0.031² * L
L = 0.117645m
L' = length of can above water
to calculate length of can above water
L' = L - h
= 0.117645 - 0.06545
= 0.052195m
= 5.22cm (rounded)
Therefore, the length of the can which above the water is 5.22cm.
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a reaction takes place in a flexible container initially at 298 k and volume of 3.00 liters. a reaction takes place causes the container to decrease in volume to 2.50 liters and its temperature becomes 273 k. what is the sign of the enthalpy change involved in this reaction and what is the sign of the work being done?
The sign of the enthalpy change involved in the reaction is negative and the sign of work done is also negative.
A reaction takes place in a flexible container initially at 298 K and volume 3L .then reaction takes place causes decrease in the volume to 2.5L and its temperature becomes 273 K.
T1 = 298 K
V1 = 3 L
V2 = 2.5 L
T2 = 273 K
The Enthalpy change is the name given to the amount of heat evolved or absorbed in a reaction carried out at constant pressure. It is given the symbol ΔH.
H = U+PV
sign of enthalpy change involved in the reaction,
Volume decreases --> PV will decrease
T decreases --> change in energy decreases
so the enthalpy change must be negative, since the change or content of energy is getting lower and same in work done.
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calcite has a chemical formula of caco3, and one gram occupies approximately 0.369 cm3. pyrite (fes2) is 1.8 times denser than calcite. what is the density of fes2?
The density of fes2 4.9 cm3.
1 gram calcite occupies 0.369 cm3 volume , first find density of calcite as explained bellow
mass of calcite = 1 gram , volume of calcite = 0.369 cm
we know formula density = mass/ volume , substitute above values in this formula to find density of calcite
density of calcite = 1/0.369 = 2.71 gram/cm3
given that pyrite is 1.8 times denser than calcite
therefore density of pyrite = 1.8 x density of calcite
substitute values in above formula to find density of pyrite
density of pyrite = 1.8 x density of calcite
density of pyrite = 1.8 x 2.71 = 4.878 gram/cm3
density of pyrite calculated by above method is 4.878 g/cm3 this value is closest value of 4.9 cm3 .
The quantity of some thing in step with unit volume, unit vicinity, or unit period: as. : the mass of a substance in step with unit volume. density expressed in grams per cubic centimeter.
A chemical components is an expression that suggests the factors in a compound and the relative proportions of those factors. If best one atom of a particular type is gift, no subscript is used. For atoms that have two or greater of a particular sort of atom gift, a subscript is written after the image for that atom..
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When 535) of heat is added to 8.5g of cooking oil at 22°C, the temperature increases to 79°C. What is the specific heat
of the cooking oil?
When 535) of heat is added to 8.5g of cooking oil at 22°C, the temperature increases to 79°C, 0.797 J/g°C is the specific heat of the cooking oil.
What is specific heat?The amount of heat needed to increase a substance's temperature by one degree Celsius in one gram, also known as specific heat.
According to the definition, a material's specific heat capacity is normally calculated by measuring the heat capacity of a sample of the substance, commonly using a calorimeter, and dividing by the sample's mass.
Given that,
Heat absorbed (Q) = 535 J
Mass = 8.5 gm
Change in temperature (ΔT) = 79°C
Now, Specific heat (S) is given by the formula:
S = Q/(m × ΔT)
or, S = 535 J/ (8.5 gm × 79°C)
or, S = 0.797 J/g°C.
Thus, 0.797 J/g°C is the specific heat of the cooking oil.
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5.
Which of the following best
describes a coefficient?
never change. Leia
a. The number in front of the symbol.
b. The number that is changed to balance
an equation.
c. The small numbers within the reaction that
e
d. Both A & B
Coefficient: A number placed in front of a formula to balance a chemical equation or The number in front of the symbol.
What is the quick answer to coefficient?A coefficient is an integer that is either multiplied by the variable it is associated with or written alongside the variable. A coefficient is the numerical factor of a term that contains both constants and variables. the coefficient in the expression 2x is 2.
What various coefficients are there?In mathematics, numerical coefficients and literal coefficients are the two main types of coefficients that are used. Both a numerical and literal coefficient: The number being multiplied by the variable is the numerical coefficient (s).
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