Why is boiling at standard temperature and pressure an inadequate method of processing for canned foods? Boiling to 100°C will kill vegetative C. botulinum cells, but any spores will survive to temperatures of 120°C.
What is standard temperature and pressure? As a result, the definition of standard temperature is 0 degrees Celsius, or 32 degrees Fahrenheit or 273.15 degrees Kelvin. In essence, this is the temperature at which pure water will freeze at sea level in air at standard pressure.25 C is the normal state temperature (298 K). Although the majority of tables are constructed for this temperature, normal state conditions do not specify a temperature. All gases are at 1 atm pressure. All gases and liquids are pure.NTP stands for normal temperature and pressure, while STP stands for standard temperature and pressure. The STP values for temperature and pressure for a gas are 273.15 K and 0.987 atm, respectively, according to IUPAC.The surroundings of a chemical reaction are described by standard pressure and temperature. The reference temperature is 273.15 K, or 0°C, or 32°F. The standard pressure is 1 atm, which is equivalent to 760 Torr, 760 mm Hg, and 101.35 kPa.Why is boiling at standard temperature and pressure an inadequate method of processing for canned foods? Boiling to 100°C will kill vegetative C. botulinum cells, but any spores will survive to temperatures of 120°C.
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Draw a structure containing an aldehyde functional group with a molecular formula of c3h6o.
This problem is asking for the structural formula of an aldehyde whose molecular formula is C₃H₆O and shown on the attached file:
Molecular formulas:In chemistry, molecular formulas show the actual number of atoms in a chemical compound; thus, in this case, we need to draw three carbon atoms together, arranged with six hydrogen atoms in which one of them contributes to the carbonyl group as an aldehyde is required.
Structural formulas:In addition to the molecular formulas, structural formulas show the number and types of bonds that are formed in an organic compound; thus, in C₃H₆O, we see three single bonds between the carbon atoms, three hydrogen atoms bonded to the third carbon, two to the second one, a double-bonded oxygen with the first carbon and the last hydrogen atom in order to complete the octets on each atom.
In such a way, we draw the required structure as shown on the attached file.
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1. Friction acts in a direction
to the
direction of an object's motion.
a. unrelated
b. opposite
c. equal
d. perpendicular
Friction acts in the opposite direction to the direction of an object's motion. Therefore, option (b) is correct.
What is Friction?Friction can be defined as the resistance provided by the surfaces that are in contact when they pass over each other. Friction offers the traction that is required to walk without slipping.
Friction can be described as a force that is dependent on external factors. Friction depends upon the nature of the two surfaces that are in contact and on the smoothness or roughness of the two contacted surfaces. When one body moves over the surface of another, these irregularities on the surface of the bodies get entangled and develop friction.
Friction depends upon the force that is exerted on these surfaces and increases when the force is applied along with the irregularities. Types of Friction are Rolling friction, Static friction, Sliding friction, and Fluid friction.
The force of friction acts in the opposite direction to the direction of an object's motion.
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How many grams of kmno4 correspond to 3.13 x 10^22 formula units of kmno4? avogadro's number is 6.022 x 10^23.
3.13 x 10^22 formula units of KMnO4 correspond to 8.19 grams.
To find out how many grams of KMnO4 correspond to 3.13 x 10^22 formula units, we need to use Avogadro's number to convert between formula units and grams.
Avogadro's number is 6.022 x 10^23, which represents the number of formula units in one mole of a substance.
First, we need to calculate the number of moles of KMnO4 corresponding to 3.13 x 10^22 formula units. We can do this by dividing the given formula units by Avogadro's number:
3.13 x 10^22 formula units ÷ 6.022 x 10^23 formula units/mol = 0.052 mol
Now, we can use the molar mass of KMnO4 to convert moles to grams. The molar mass of KMnO4 is:
K: 39.10 g/mol
Mn: 54.94 g/mol
O: 16.00 g/mol (4 atoms)
Molar mass of KMnO4 = 39.10 g/mol + 54.94 g/mol + (16.00 g/mol x 4) = 158.04 g/mol
Finally, we can calculate the grams of KMnO4:
0.052 mol × 158.04 g/mol = 8.19 grams
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Someone plz help me :(
Answer:
120
Explanation:
8 • 15
1. Express each of the following as a ratio strength.
A. 0.5 % v/v
B. 2 mg of active ingredient in 2 mL solution
C. 10 ppm
2. Express 1:250 w/v to % w/v.
3. Are the following concentrations representations equivalent?
A. 1:1000 w/v
B. 0.1 % w/v
C. 1 mg/mL
4. Calculate the ratio strength v/v of glycerin in the Rx below.
Rx
Liquefied phenol ....... 0.2 mL
Camphor ................... 0.25 g
Benzocaine ............... 1.1 g
Glycerin ..................... 2 mL
Purified water .. up to 250 mL
The ratio strength v/v of glycerin is 2:250 v/v, which simplifies to 1:125 v/v.
1. The expressions as ratio strengths are as follows:
A. 0.5% v/v can be expressed as 1:200 v/v.
B. 2 mg of active ingredient in 2 mL solution is 1:1 w/v.
C. 10 ppm can be expressed as 1:100,000 w/v.
2. To convert 1:250 w/v to % w/v, we need to divide the numerator (1) by the denominator (250) and multiply the result by 100. Thus, 1:250 w/v is equivalent to 0.4% w/v.
3. The concentrations are as follows:
A. 1:1000 w/v is equivalent to 0.1% w/v.
B. 0.1% w/v is equal to 1:1000 w/v.
C. 1 mg/mL is equal to 0.1% w/v.
Therefore, all three representations are equivalent.
4. To calculate the ratio strength v/v of glycerin in the given prescription, we need to determine the amount of glycerin in relation to the total volume. The prescription states that there is 2 mL of glycerin in a final volume of 250 mL. So, the ratio strength v/v of glycerin is 2:250 v/v, which simplifies to 1:125 v/v.
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how many kilojoules is 1,500,000 calories
Answer:
1 cal = 0.004187 kJ
1,500,000 cal = 6280.5 kJ
if the temperature of this equilibrium was increased, what would happen to the equilibrium yield of chlorine?
Answer:
the temperature of the system decreases
Which statement is most supportive of the claim that genetic diversity is an advantage of sexual reproduction?(1 point)
Responses
Asexual reproduction results in the same genes being copied, which means the same vulnerabilities in the population.
Lack of genetic diversity from asexual reproduction results in a diminished ability to survive changes to the environment.
Genetic variation from sexual reproduction ensures that at least some individuals will have advantageous traits that help them survive.
Sexual reproduction creates genetic diversity, which results in a wide range of appearances in a population.
Genetic diversity is produced by sexual reproduction, which gives a population a variety of appearances. The following paragraph contains the necessary information regarding genetic diversity.
What makes genetic variety crucial?It is possible for organisms to adapt to changing environmental conditions and prevent inbreeding by maintaining significant genetic variety. When there are limited, isolated populations, inbreeding takes place, which might make a species less able to endure and procreate.
What exemplifies genetic variety the best?Genetic diversity is the range of different hereditary traits within a species. There would be several people with a wide range of diverse traits in such a species with significant genetic diversity. For a community to adapt to shifting surroundings, genetic variety is essential.
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Shawn has a bracelet made of an unknown metal. Shawn finds that the bracelet has a volume of 7 cm3 and a mass of 135 g. Which metal is the bracelet most likely made of?
The bracelet's density is 19.3 g/cm³, which is close to the density of gold (19.3 g/cm³) and silver (10.5 g/cm³). However, it's most likely made of gold due to its higher density.
To calculate the density of the b, divide the mass (in grams) by the volume (in cubic centimeters):
density = mass / volume
density = 135 g / 7 cm³
density = 19.3 g/cm³
Sine the density of the metal is relatively high, it's likely to be a dense metal like gold or platinum. However, the density of gold is 19.3 g/cm³, which is very close to the density of the bracelet. The density of silver is much lower, at 10.5 g/cm³, so it's less likely to be made of silver. Based on this information, it's most likely that the bracelet is made of gold.
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A 4.00g sample of gas is found to exert a pressure of 1.71 atm when confined in 3.60L container at a temperature of 24
Answer:
There are 0.311 moles of gas in the tank
Explanation:
Complete question
A 4.00g sample of gas is found to exert a pressure of 1.71 atm when confined in 3.60L container at a temperature of 241 K. Find the number of moles of the gas
Solution
As we know
\(PV = nRT\)
where P is the pressure of the gas in atm
V is the volume in liters
n is the number of moles
R is the gas constant = 0.08206 L·atm/K·mol
and T is the temperature in Kelvin
Substituting the given values in above equation, we get -
\(1.71 * 3.60 = n * 0.08206 * 241\\n = 0.311\)
There are 0.311 moles of gas in the tank
4 molecules of hydrogen (H2) react with 2 molecules of oxygen (O2) to produce some amount of water (H2O).
Complete the table below.
Chemical element Number of atoms in the reaction
-H -
-O -
During this reaction, how many molecules of water (H2O) are produced?
Answer:
2H2+ 02-->2H20
So 4H2 + 202-->4H20
so the answer is 4 water molecules.
Chalk is a silicate carbonate evaporite sandstone QUESTION 33 a photosyntehtic creature with a silica shell can be a O coccolithophorid foraminifer diatom radiolarian QUESTION 34 recrystallization of chalk at the ocean bottom (not in metamorphic conditions) can give us O micrite chert marble quartzite
Diatoms are single-celled algae that have a silica (silicate) shell called a frustule.
Diatoms are photosynthetic organisms and are known for their intricate and diverse shapes. Diatoms are commonly found in freshwater and marine environments and play a significant role in the global carbon cycle.
Micrite is a fine-grained carbonate sedimentary rock composed of tiny carbonate particles. It forms through the precipitation and accumulation of carbonate minerals, such as calcite or aragonite, in marine environments. In the case of chalk, which is primarily composed of microscopic fragments of calcium carbonate from marine organisms, recrystallization can occur at the ocean bottom under specific conditions, leading to the formation of micrites.
Therefore, it's important to note that chert, marble, and quartzite are not the typical products of recrystallization of chalk at the ocean bottom.
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Calculate the equilibrium constant at 25°C for the reaction
Zn (s) + 2H+(aq) ⇄ H2(g) + Zn2+ (aq)
Zn2+ + 2e- → Zn(s) ℰ° = -0.76 V Provide your answer rounded to 2 significant figures.
To calculate the equilibrium constant (K) for the reaction Zn(s) + 2H+(aq) ⇄ H2(g) + Zn2+(aq) at 25°C, we can use the Nernst equation, which relates the standard cell potential (ℰ°) to the equilibrium constant:
ℰ° = (RT/nF) * ln(K). Rounded to 2 significant figures, the equilibrium constant (K) for the reaction is 4.8 x 10^4.
The equilibrium constant (K) can be calculated using the Nernst equation:
K = e^((-ΔG°)/RT)
Where:
- ΔG° is the standard free energy change for the reaction (-nFE°, where n is the number of moles of electrons transferred, F is Faraday's constant, and E° is the standard electrode potential)
- R is the gas constant (8.314 J/mol*K)
- T is the temperature in Kelvin (25°C = 298 K)
First, we need to calculate the standard electrode potential (E°) for the half-reaction Zn2+ + 2e- → Zn(s):
E° = -0.76 V
Now we can use this value to calculate ΔG°:
ΔG° = -nFE°
= -(2 mol)(96485 C/mol)(-0.76 V)
= 146606 J/mol
Next, we can plug in the values for ΔG°, R, and T into the Nernst equation:
K = e^((-ΔG°)/RT)
= e^((-146606 J/mol)/(8.314 J/mol*K*298 K))
= 2.2 x 10^-18
Therefore, the equilibrium constant for the reaction Zn (s) + 2H+(aq) ⇄ H2(g) + Zn2+ (aq) at 25°C is 2.2 x 10^-18, rounded to 2 significant figures.
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help me out with this? really appreciate it
polyesters are condensation polymers. what mechanistic role does the sodium acetate play in the polymerization process? use chemdraw to provide a pictorial explanation in addition to a written explanation.
Polyesters are indeed condensation polymers, meaning they are formed through the condensation reaction between two monomers with the loss of a small molecule, typically water or an alcohol.
In the case of polyesters, the two monomers involved are a diol and a dicarboxylic acid. During the polymerization process, the diol and dicarboxylic acid react with each other to form an ester linkage and release a molecule of water. This process is repeated many times, resulting in the formation of a long chain of repeating ester units, which is the polyester polymer.
Sodium acetate is sometimes used as a catalyst in the polyester polymerization process. As a catalyst, it plays a mechanistic role in facilitating the reaction between the diol and the dicarboxylic acid by increasing the rate of the reaction without being consumed in the process. Specifically, sodium acetate helps to neutralize the acidic protons on the dicarboxylic acid, which can act as a dehydrating agent and hinder the reaction. By neutralizing these protons, sodium acetate helps to prevent premature dehydration and promote the formation of the ester linkage.
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still considering the t=0k limit, what fraction of the total number ntotal of free electrons in the metal will be at energies above the fermi energy?
In the t=0 K limit, the fraction of the total number of free electrons in a metal that will be at energies above the Fermi energy can be determined using Fermi-Dirac statistics.
The concept of the Fermi-Dirac distribution function. The Fermi-Dirac distribution function, denoted as f(E), gives the probability of an energy state E being occupied by an electron at a given temperature. At absolute zero temperature (t=0 K), the distribution function becomes a step function, f(E) = 0 for E > Ef (energies above the Fermi energy)
f(E) = 1 for E ≤ Ef (energies up to and including the Fermi energy)
The fraction of electrons above the Fermi energy can be calculated by integrating the distribution function for energies above the Fermi energy and dividing it by the total number of free electrons in the metal (ntotal). Fraction above Fermi energy = ∫[Ef to ∞] f(E) dE / ntotal.
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The ease with which a liquid evaporates depends on the strength of its intermolecular forces. A liquid with stronger intermolecular forces will have a ______ vapor pressure at a given temperautre and thus a ______ boiling point.
A liquid with stronger intermolecular forces will have a lower vapor pressure at a given temperature and thus a higher boiling point.
Which of the following is a covalent compound?
A BaCl2
(B) CHO
c) LiOH
D KNO3

Answer:
(B) CHO
Explanation:
A covalent bond is a bond type usually formed between non-metals that have little to no electronegativity differences between them.
Bonds between metals and non-metals are usually ionic in nature. All the other given choices are ionic and a combination of covalent bond.
CHO contains non-metals that are electronegative. There will be sharing of electrons between these atomic species and this will lead to a covalent bond.
by knowing that hexane has the molecular formula c6h14 and cyclohexane has the molecular formula c6h12, it becomes clear that the formation of a ring resulted in the molecule having 2 fewer hydrogen atom. with this in mind, how many rings does an alkane have if its formula is c10 h16 ?
The alkane with the molecular formula C10H16 has one ring. This ring structure reduces the number of hydrogen atoms by two compared to the corresponding straight-chain alkane.
To determine the number of rings in an alkane with the formula C10H16, we can compare it to the corresponding straight-chain alkane, which would be C10H22. Since the alkane C10H16 has 2 fewer hydrogen atoms than its straight-chain counterpart, it suggests the presence of one ring in the molecule.
The molecular formula of an alkane provides information about the number of carbon and hydrogen atoms in its structure. In the given formula C10H16, the presence of 10 carbon atoms indicates that it forms a chain of carbon atoms. However, since it has 16 hydrogen atoms, which is 2 fewer than the maximum number of hydrogen atoms possible for a straight-chain alkane with 10 carbon atoms, there must be a structural deviation. The deviation in the number of hydrogen atoms suggests the formation of one ring in the molecule. Each carbon atom in the ring contributes two hydrogen atoms, whereas in a straight-chain alkane, each carbon atom is bonded to three hydrogen atoms. By forming a ring, two of the carbon atoms in the chain lose one hydrogen atom each, resulting in a net loss of two hydrogen atoms.
Therefore, the alkane with the molecular formula C10H16 has one ring. This ring structure reduces the number of hydrogen atoms by two compared to the corresponding straight-chain alkane. It is important to note that the specific arrangement of the carbon atoms in the ring and their connectivity would determine the isomeric form of the molecule.
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PLEASE just help me!!! Its my last question!!!!
If you add a light bulb to the circuit, the filament in the bulb will resist the flow of electrons and convert energy into_____ and ______.
Question 2 options:
light and heat
energy and matter
electrons and neutrons
electrons and protons
Answer:
Light and heat
ur welcomeeeeeeee
Answer:
Light and Heat
Give the other guy brainiest
Explanation:
Thx for the point though
Which of the following is not a benefit of using a scientific model?
А Models allow you to formulate hypotheses about processes.
B Models allow you to study processes that cannot be duplicated.
C Models are often simplified to help explain complex concepts.
D Models make it possible to duplicate the real thing.
Answer:
Benifits of scientific modeling
Explanation:
When students are engaged in scientific modeling, they are able to notice patterns and develop and revise representations that become useful models to predict and explain--making their own scientific knowledge stronger, helping them to think critically, and helping them know more about the nature of science.
What pillar of sustainability is broken by recycling
electronics in India? Should the US make a law that electronics can
only be recycled in the US?
The pillar of sustainability broken by recycling electronics in India is environmental sustainability. Implementing a law that restricts electronics recycling to the US would not necessarily be the most effective solution, as it overlooks the complex global dynamics of electronic waste management.
Recycling electronics in India often involves improper disposal methods, such as burning or dismantling without proper safety measures. This leads to environmental pollution, including the release of hazardous substances into the air, soil, and water, thus violating the principle of environmental sustainability.
However, simply mandating that electronics can only be recycled in the US may not be the most optimal solution. Electronic waste is a global issue, and restricting recycling to a single country disregards the fact that electronic products are manufactured and consumed worldwide. A more comprehensive approach to addressing electronic waste would involve international cooperation, strict regulations, and monitoring of recycling practices to ensure they meet environmental standards.
Efforts should focus on improving recycling practices globally, including promoting responsible electronic waste management, developing sustainable recycling infrastructure in multiple countries, and encouraging the adoption of safe and environmentally friendly recycling practices. This approach would foster global sustainability and address the challenges associated with electronic waste disposal more effectively than a geographically limited restriction.
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Which of the following describes a limiting reactant? Question 10 options: A) The reactant that runs out last and limits how much product can be made B) The reactant that is present at the smallest mass C) The reactant that runs out first and limits how much product can be made D) An inert element
Answer:
The correct choice is option C) The reactant that runs out first and limits how much product can be made
Explanation:
The limiting reactant is a reactant in a chemical reaction that gets consumed first and thus limits how much product can be formed.
Answer:
The reactant that runs out first and limits how much product can be made
Explanation:
state whether true or false if false write the correct the statement:mammals have evolved from reptiles and amphibia from fishes
Answer:
both are true
Explanation:
Decane (C10H22) is used in diesel. The combustion for decane follows the equation: 2 C10H22 + 31 O2 à 20 CO2 + 22 H2O. Calculate the amount, in grams, of water (H2O) produced by the combustion of 568 grams of decane (C10H22) with 2976 grams of oxygen gas (O2). 692 792 892 992
The mass of water produced is 792 grams by the combustion of 568 grams of decane.
Given:
Combustion of 568 grams of decane with 2979 grams of oxygen.
\(2 C_{10}H_{22 }+ 31 O_2 \rightarrow 20 CO_2 + 22 H_2O\)
To find:
The mass of water produced by combustion of 568 grams of decane.
Solution:
Mass of decane = 568 g
Moles of decane :
= \(\frac{568 g}{142 g/mol}=4 mol\)
Mass of oxygen gas = 2976 g
Moles of oxygen gas:
= \(\frac{2976 g}{32 g/mol}=93 mol\)
\(2 C_{10}H_{22 }+ 31 O_2 \rightarrow 20 CO_2 + 22 H_2O\)
According to reaction, 2 moles of decane reacts with 31 moles of oxygen, then 4 moles of decane will react with:
\(=\frac{31}{2}\times 4mol=62\text{ mol of}O_2\)
But according to the question, we have 93.0 moles of oxygen gas which is more than 62 moles of oxygen gas.
So, this means that oxygen gas is present in an excessive amount. Which simply means:
Oxygen gas is an excessive reagent.Decane is a limiting reagent.Decane being limiting reagent will be responsible for the amount of water produced after the reaction.According to reaction, 22 moles of water is produced from 2 moles of decane, then 4 moles of decane will produce:
\(=\frac{22}{2}\times 4mol=44\text{mol of }H_2O\)
Mass of 44 moles of water ;
\(=44mol\times 18g/mol=792g\)
792 grams of water is produced by the combustion of 568 grams of decane.
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what more accurate model of the atom emerged from Albert Einstein's contributions and quantum mechanics
Answer:
Einstein also in 1905 mathematically proved the existence of atoms, and thus helped revolutionize all the sciences through the use of statistics and probability. Atomic theory says that any liquid is made up of molecules (invisible in 1905)
Explanation:
Answer:
The discoveries of Albert Einstein led to development in the understanding of the atom through the study of quantum mechanics and the electron cloud. In this model, there is still a nucleus with protons and neutrons. But unlike the Bohr model, the electrons exist in a cloud outside the nucleus, much like the fruit around the pit of a peach.
Explanation:
How would I balance this?
The balanced chemical equation is as follows:
4KClO₃ ₍s₎ ⇒ 3KClO₄ ₍s₎ + 3KCl
What is balance chemical equation ?The term balanced chemical equation is defined an equation where the number of atoms of each type in the reaction is the equal on both reactants and product sides.
The chemical equation must be balanced in order to obey the law of conservation of mass. When the number of different atoms of elements in the reactants side equals the number of atoms in the products side, the chemical equation is balanced.
Thus, The balanced chemical equation is as follows:
4KClO₃ ₍s₎ ⇒ 3KClO₄ ₍s₎ + 3KCl
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In a reacting flask, 500 cm3 hydrogen is mixed with 500 cm3 oxygen and is ignited. (a) Which reactant is the limiting reagent? (b) Calculate the mass of water formed.
Answer:
See Explanation
Explanation:
From Gay-Lussac's law of combining volumes;
Equation of the reaction; 2H2(g) + O2(g) -------> 2H2O(g)
Ratio of volumes; 2 : 1 : 2
Initial volumes; 500cm^3 500cm^3 0 cm^3
Reacting volumes; 500cm^3 250cm^3 500cm^3
Final Volumes; 0 cm^3 250 cm^3 500 cm^3
We can easily see from the table that the limiting reactant is oxygen.
Hence, the mass of water formed is obtained from;
1 mole of gaseous water occupies 22400 cm^3
x moles of water occupies 500cm^3
x = 500cm^3 * 1 mole/22400 cm^3
x = 0.022 moles of water
Mass of water = 0.022 moles of water * 18 g/mol
Mass of water = 0.396 g
KHP, the acid used in this experiment,
stands for potassium hydrogen
phosphorous.
True
False
Answer:
false
Explanation:
standard form is Potassium hydrogen phthalate
What is the balanced equation for
Solid calcium fluoride decomposes to form calcium metal and fluorine gas?
The balanced equation for the given reaction is:
CaF2(s) → Ca(s) + F2(g)
This equation indicates that one molecule of calcium fluoride (CaF2) decomposes into one molecule of calcium (Ca) and one molecule of fluorine gas (F2). The equation is balanced because the number of atoms of each element is equal on both sides of the equation.