0.5 moles are present in 20 grams of calcium.
The mole, which is denoted by the symbol "mol," is the volume of a system that includes as many elementary particles as there are atoms in 0.012 kilograms of carbon 12.
The number of atoms, molecules, or ions that make up one mole of a substance is 6.022 × 10²³ . The term "Avogadro's number" or "Avogadro's constant" refers to the number 6.022 × 10²³
Atomic Mass of Calcium = 40u
(Atomic Mass is same as Molar Mass, so)
Molar Mass of Calcium = 40g
Formula to find number of moles
Number of Moles = given mass / molar mass
= 20 / 40 = 0.5 moles
Therefore, 0.5 moles are present in 20 grams of calcium.
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The complete question is
How many moles are there in 20 g of calcium
A sample of n2o gas has a density of 3.10 g/l at 298 k.what must be the pressure of the gas (in mmhg)?
P=___mmHg
The pressure of N2O gas at a density of 3.10 g/L and a temperature of 298 K is 751 mmHg. To calculate the pressure of the N2O gas at a given density and temperature, we can use the ideal gas law: PV = nRT.
We know that the density of the gas is 3.10 g/L, and the temperature is 298 K. To find the pressure, we can assume that the volume of the gas is 1 L, and solve for pressure. where P is the pressure of the gas, V is the volume, n is the number of moles, R is the ideal gas constant, and T is the temperature in Kelvin.
The density of a gas can be converted to moles using the formula:
Density = m/V
m = Density*V
Now we can use the ideal gas law to calculate the pressure:
P = (mRT)/V
R is the ideal gas constant = 0.0821 L atm K^-1 mol^-1
P = (3.10g0.0821 L atm K^-1 mol^-1298 K)/1 L
P = 751 mmHg
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The amount of atomic particles released by a radioactive material in a specific time is determined by strong and weak nuclear forces. strong and weak gravitational forces. attraction and repulsion caused by electric forces. attraction and repulsion caused by magnetic forces.
The amount of atomic particles released by a radioactive material in a specific time is determined by strong and weak nuclear forces option- 1 is correct.
What exactly do you mean by radioactive materials?Radioactive materials fall under the category of radionuclides, which are chemicals with unstable atomic nuclei. They adjust the nucleus to stabilize themselves (spontaneous fission, emission of alpha particles, or conversion of neutrons to protons or the reverse).
The amount of atomic particles released by a radioactive material over a given period of time depends on how quickly it decays.
The weak nuclear forces that exist between the nucleons of atomic particles control how quickly radioactive materials decay over time.
The nuclear forces can therefore be used to calculate the total number of atomic particles that a radioactive material releases in a given period of time (strong or weak).
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If 1.70g of aniline reacts with 2.10g of bromine, what is the theoretical yield of 4-bromoaniline (in grams)
If 1.70g of aniline reacts with the 2.10 g of bromine, the theoretical yield of 4-bromoaniline is 2.25 g.
1 mole mole of the aniline react with the 1 mol of Br₂ produces 1 mole of the 4 - bromoaniline.
mass of aniline = 1.70 g
molar mass of aniline = 93 g/mol
moles of aniline = 0.0182 mol
mass of Br₂ = 2.10 g
molar mass of Br₂ = 160 g/mol
moles = 2.10/ 160
= 0.0131 mol
Br₂ is limiting reagent .
moles of 4-bromoaniline = 0.0131
mass of 4-bromoaniline = moles × molar mass
= 0.0131 × 172
= 2.25 g
Thus, the theoretical yield is 2.25 g.
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like tobacco smoke, the aerosol given off by an e-cigarette can contain dangerous chemicals.
Yes, the aerosol given off by an e-cigarette can contain dangerous chemicals, such as nicotine, ultrafine particles, volatile organic compounds, and heavy metals.
Inhaling these chemicals can increase the risk of lung and heart disease.
E-cigarettes are becoming increasingly popular as an alternative to tobacco-based cigarettes. However, many people are unaware of the potential dangers associated with using e-cigarettes. The aerosol produced by e-cigarettes can contain not only nicotine, but also other chemicals and particles that can be harmful to the user’s health. These include ultrafine particles, volatile organic compounds, and heavy metals such as lead and nickel.
When these particles and chemicals are inhaled, they can cause inflammation and irritation of the lungs and airways, leading to a variety of respiratory illnesses.
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What causes pressure inside a helium balloon?
OA. The helium atoms exert an electrostatic force that pushes the
surface outward.
OB. The helium atoms expand and press on the surface of the balloon.
OC. The helium atoms bounce off the surface as they move inside the
balloon.
OD. The helium atoms stick to the surface of the balloon and increase
its weight.
Pressure inside a helium balloon: The helium atoms expand and press on the surface of the balloon.
What is helium balloon?Helium balloons are a type of balloon filled with helium gas. Helium is a light, non-flammable, inert gas that is found in abundance in the atmosphere and is used to inflate balloons. Helium balloons are often used in decorations, promotions, special events, parties, and displays. They come in a variety of shapes, sizes, and colors, and can be filled with helium and released into the atmosphere, creating a festive atmosphere. Helium balloons are also used in scientific experiments, such as measuring wind speeds, studying atmospheric pressure and air movement, and measuring the temperature of the atmosphere.
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How many protons neutrons and electrons does carbon-14 have if it has a neutral charge?
Protons, neutrons and electrons that carbon-14 have if it has a neutral charge is 6 electrons, 8 neutron, and 6 proton.
The total of an element's protons plus neutrons is that element's mass number. One atomic mass unit, or amu, roughly equals the weight of neutrons and protons. While atomic number equal to proton and electron.
The proton can be calculate as follows:
C−14 has atomic no = 6 and mass no = 14.
so
No of electrons = No of protons = atomic no = 6
No of neutron = mass no-atomic no = 14−6=8
Therefore, Protons, neutrons, and electrons that carbon-14 have if it has a neutral charge is 6 electrons, 8 neutron, and 6 proton.
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Which element does not form a stable ion with the same electronic configuration as neon?
A Magnesium B Fluorine C Sodium D Chlorine
Answer:
Explanation:
chlorine
Chlorine must lose 7 electrons to attain the electronic configuration of Neon and this state is precarious in the case of chlorine which is an electronegative element
Compare a nuclear reaction, such as uranium’s alpha particle emission, with a nonnuclear reaction, such as the reaction of sodium with chlorine. What’s the fundamental difference between these two types of reactions?
Be sure to discuss electrons vs nuclear changes and fundamental differences.
A nuclear reaction like α decay takes place in the nucleus of an atom.An element becomes a different element. A chemical reaction like the formation of NaCl involves rearranging the electrons, which are outside the nucleus. The elements are not change. Salt is consists of sodium and chlorine.
What is nuclear reaction ?The splitting of the uranium-235 nucleus when it is blasted with neutrons is a crucial illustration of nuclear fission. This nuclear reaction can result in a number of different compounds.
Nuclear vs Chemical reactions
1. Alpha decay
U₉₂²³⁸ ⇒ He₂⁴ + Th₉₀²³⁴
A nuclear reaction like α decay takes place in the nucleus of an atom.
An element becomes a different element.
2. Chemical reaction
Na· + ·Cl ⟶ Na⁺ + Cl⁻
A chemical reaction like the formation of NaCl involves rearranging the electrons, which are outside the nucleus.
The elements are not change. Salt is consists of sodium and chlorine.
Thus, A nuclear reaction like α decay takes place in the nucleus of an atom.
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Which of the following could account for the weakening of hurricanes when they reach the Atlantic Ocean? Ocean waters in the Atlantic . .
A.) decrease in temperature.
B.) increase in temperature.
C.) decrease in salinity.
D.) increase in salinity.
A decrease in temperature could account for the weakening of hurricanes when they reach the Atlantic Ocean. hence option A is the correct answer.
How is Hurricane formed?There must be warm ocean water and wet, humid air in the area for one to form. When humid air flows upward at a low-pressure zone over warm ocean water, water is released from the air, resulting in storm clouds. The air in a hurricane rotates as it rises.
Hurricanes begin with the evaporation of warm seawater, which causes water to be pumped into the lower atmosphere. When converging winds collide and turn upwards, this humid air is pulled aloft.
Hurricanes arise when warm, moist air rises over sea. Cooler air replaces the rising air. Large clouds and thunderstorms continue to form as a result of this process. Because of the Coriolis Effect, these thunderstorms continue to expand and begin to rotate.
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In a titration experiment, a 12.5 mL sample of 1.75 x 10^-2 M Ba(OH) 2 just neutralized 14.5 mL of HNO 3 solution. Calculate the molarity of the HNO 3 solution.
The number of moles must be equal, the ratio of the molarity of each must be equal to the ratio of the volumes used.
What is experiment?An experiment is a procedure or set of procedures used to test a hypothesis or explore a cause and effect relationship. It is a scientific method of investigation in which the investigator manipulates one or more independent variables and measures the subsequent effect on one or more dependent variables. Experiments are conducted to answer questions, test theories, and gain insight into cause-and-effect relationships.
The molarity of the HNO 3 solution can be calculated using the equation:
Molarity of HNO3 = (volume of HNO3 * molarity of Ba(OH)2) / volume of Ba(OH)2
Molarity of HNO3 = (14.5 mL * 1.75 x 10^-2 M) / 12.5 mL
Molarity of HNO3 = 1.4 x 10^-2 M
This equation works because the number of moles of HNO3 neutralized by the Ba(OH)2 must be equal to the number of moles of Ba(OH)2 used. The number of moles of each can be determined by multiplying the molarity of each by the volume used, and since the number of moles must be equal
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Which sample of matter has the lowest average kinetic
energy?
O 50. g at -55°C and 2.0 atm
O 50. g at 273 K and 4.0 atm
O 50. g at 33°C and 3.0 atm
O 50. g at 367 K and 1.0 atm
The given sample of matter has the lowest average kinetic energy is 50g at -55°C and 2.0 atm option - A is correct answer.
What exactly is kinetic energy?The force an object experiences as a result of motion is known as kinetic energy. An object can only accelerate if a force is applied to it. We have to put in the effort to use force. Once the work is done, energy is transferred to the object, which then moves at a new, constant speed.
Kinetic energy, which can be seen in the motion of an object or subatomic particle, is the energy of motion.
The average kinetic energy is the subject of the query. Thus, the only connection is to temperature. Kinetic energy increases with increasing temperature and decreases with decreasing temperature.
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A car has a mass of 2,050 kg and is traveling at 28 meters per second. What is the car's kinetic energy?
After solving the equation the car's kinetic energy is 783,500 kg m2/s2.
What is kinetic energy?Kinetic energy is the energy of motion, or the energy associated with an object or system due to its motion. It is a form of energy that can be converted into other forms of energy, such as thermal energy, sound energy, electrical energy, and so on.
The car's kinetic energy is the energy it has due to its motion. Kinetic energy is calculated as KE = 1/2mv2, where m is mass and v is velocity. In this case, the car has a mass of 2,050 kg and is traveling at 28 meters per second. Plugging these values into the equation gives:
KE = 1/2(2050 kg)(28 m/s)2
= 1/2(2050 kg)(784 m2/s2)
= 783500 kg m2/s2
Therefore, the car's kinetic energy is 783,500 kg m2/s2.
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What is the smallest measurement you can make on the meter stick using the metric scale?
The smallest measurement you can make on the meter stick using the metric scale is the millimeter.
The millimeter is the smallest measurement on the meter stick . The millimeter is the smallest reading in the meter stick. we use the meter stick to simply measure the length. The meter reading is calibrated in the centimeters in the meter scale. the least count in the meter scale is the millimeters. we can measure the things as the length of the table or the width.
Thus, the smallest measurement in the meter stick using the meter scale is the millimeters. the symbol of the millimeters is mm.
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Please help with these 10 questions!! Show all work!! Will give brainliest!! :)
Carbon Dioxide: CO2
Formula: C + O2
15.0 moles of CO2 contains (15.0 moles CO2) x (1 mole C / 1 mole CO2) = 15.0 moles of C
Carbon Dioxide: CO2
Formula: C + O2
15.0 moles of CO2 contains (15.0 moles CO2) x (2 moles O / 1 mole CO2) = 30.0 moles of O
Calcium Chloride: CaCl2
Formula: Ca + 2Cl
23.0 moles of CaCl2 contains (23.0 moles CaCl2) x (1 mole Cl / 2 moles Cl) = 11.5 moles of Cl
Sulfur Dioxide: SO2
Formula: S + O2
295.0 grams of SO2 contains (295.0 grams SO2) x (1 mole S / 64.066 grams) = 4.6 moles of S
Potassium Sulfate: K2SO4
Formula: 2K + S + 4O
295.0 grams of K2SO4 contains (295.0 grams K2SO4) x (1 mole S / 174.259 grams) = 1.69 moles of S
Iron: Fe
Formula: Fe
565.0 grams of Fe contains (565.0 grams Fe) x (1 mole Fe / 55.845 grams) = 10.15 moles of Fe
metallic elements
SO2 is a covalent compound. It consists of one sulfur atom and two oxygen atoms joined together by covalent bonds, which are strong chemical bonds where electrons are shared between atoms.
H
|
O-H
A water molecule is polar because the electrons are not shared equally between the oxygen and hydrogen atoms. Oxygen is more electronegative than hydrogen, so it pulls the electrons closer to itself, creating a partial negative charge on the oxygen side of the molecule and a partial positive charge on the hydrogen side. This causes the molecule to have a dipole moment and makes the molecule polar.
NH3 (Ammonia) - the molecule is a pyramidal shape, which means that the Nitrogen is at the center and the three hydrogen atoms are located at the three corners of a pyramid.
H2O (Water) - the molecule is a V-shape, this shape is determined by the angle between the two bonding pairs and the two non-bonding pairs of electrons.
CH4 (Methane) - the molecule is tetrahedral shape, the carbon is in the center, and the four hydrogen atoms surround the carbon in a tetrahedral arrangement.
A color change
The formation of a precipitate
The evolution of a gas
A change in temperature
Uday Tahlan
Investigating Jessie's Claim
Identifying the Other Reactant
If the container was not empty when Jessie added the chlorine gas, then what could have been inside it? Below is an image
showing the reaction inside the container. There is also a table that lists some of the substances that Dr. Yung keeps in her lab.
The group of atoms that repeat to form each substance, as well as some of the properties of each substance, are included in the
table.
Procedure
1. Use the tokens and the information in the table to determine what the other reactant inside the container could have been.
2. Once you have identified the other reactant, answer the questions below.
according to the department of transportation hazardous materials are defined as
Hazardous materials are substances or chemicals that pose a health hazard, a physical hazard, or harm to the environment.
What is hazardous materials?Weapons of mass destruction, as well as other matter or energy that have the potential to do harm to people, the environment, and property, when discharged.The EPA divides hazardous waste into three categories: listed, characteristic, and mixed radiological waste. Although there are numerous subclasses within each of these groups, the following are the broad groupings.Any cause of potential danger, harm, or negative health impacts on something or someone is a hazard. Basically, a risk is the potential for harm or a negative outcome (for example, to people as health effects, to organisations as property or equipment losses, or to the environment).A hazard is a potential source or circumstance that could cause harm to people or their health, damage to property, or harm to the environment.
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(05.04 LC)
How many moles of sulfuric acid (H₂SO4) are needed to react completely with 6.8 moles of lithium hydroxide (LiOH)?
2LIOH + H₂SO4 → Li2SO4 + 2H₂O
O 3.4 mol H₂SO4
O 6.8 mol H₂SO4
O 10.2 mol H₂SO4
O 13.6 mol H₂SO4
3.4 mole of H₂SO₄ are needed to react completely with 6.8 moles of lithium hydroxide (LiOH).
Is lithium hydroxide harmful to humans?When breathed in, lithium hydroxide monohydrate can have an impact on you. Lithium Hydroxide Monohydrate is a HIGHLY CORROSIVE CHEMICAL, and contact with it can cause serious skin irritation, eye damage, and burning. Lithium Hydroxide Monohydrate inhaled can irritate the throat and nose.
From the stichiometry of the reaction: 2 LiOH + H2SO4 → Li2SO4 + 2H2O
It is evident that 2.0 moles of LiOH reacts with 1.0 mole of H2SO4 to produce 1.0 mole of Li2SO4 and 2.0 moles of H2O.
Using cross multiplication:
1.0 mole of H2SO4 reacts completely with → 2.0 moles of LiOH
x mole of H2SO4 are needed to react completely with → 6.8 moles of LiOH
since number of moles of H2SO4 = ( 1.0 x 6.8 ) / (2.0) = 3.4 mole of H2SO4.
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The statement "atoms have a small, dense nucleus" is true. What evidence do scientists use to prove this statement as true?
Most alpha particles shot at gold foil go straight through, without any changes in their direction.
The particles ejected in Thomson's experiment bent away from the negatively charged plates, but toward positively charged plates.
A few alpha particles shot at gold foil bounce in the opposite direction
No matter which element Thomson put in a cathode ray tube, the same negative particles with the same properties (such as charge and mass) were ejected.
To see the number of atoms of an element in a given molecule we need to multiply stoichiometry to the number that is written on the foot of the element that is stoichiometry. Therefore, the correct option is option C.
What is atom?Atom is the smallest particle of any element, molecule or compound. Atom can not be further divided. Atoms contains nucleus in its center and electron that revolve around the atom in fixed orbit.
In the nucleus, proton and neutron are present. Electron has -1 charge while proton has +1 charge. Neutron is neutral that is it has no charge. So overall the charge of nucleus is due to only proton, not by neutron.
The statement "atoms have a small, dense nucleus" is true. A few alpha particles shot at gold foil bounce in the opposite direction is the evidence.
Therefore, the correct option is option C.
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Identify at least two physical properties (streak, fracture, etc.) of a mineral while using examples of common minerals that prominently feature those properties. Provide links or screenshots of the discussed minerals to illustrate the highlighted properties. Also, explain what mineral group it belongs to and why.
The two physical properties of a mineral can be color, streak and even cleavage also.
Color, streak, cleavage, hardness, specific gravity, fracture, luster, and crystal structure are only a few of the many diverse characteristics. I'll speak specifically about color and shine as they relate to diamonds and how they significantly impact the value of the individual stone. Diamonds are a type of carbon polymorph.
Polymorphism, as used in materials science, refers to the fact that a solid material can exist in more than one crystal structure or form. Isomerism in the form of polymorphism. The phenomena can be seen in any crystalline substance. A chemical element's polymorphism is referred to as allotropy. Pharmaceuticals, agrochemicals, pigments, dyestuffs, meals, and explosives all have practical applications for polymorphism. "A reversible transition of a solid crystalline phase at a given temperature and pressure (the inversion point) to another phase of the same chemical composition with a different crystal structure," according to IUPAC, describes a polymorphic transition.
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After the shuttle disaster, an unknown compound residue was removed from a piece of the debris. Upon analysis, it was found to contain 2. 61 g of carbon, 6. 09 g of nitrogen, and 1. 31 g of hydrogen. What is its empirical formula?
The empirical formula of the compound is C2N3H2.
What is an Empirical formula?
An empirical formula is a type of chemical formula that shows the simplest ratio of atoms in a molecule, rather than the total number of atoms. It is the simplest possible chemical formula that shows the relative numbers of each type of atom in a molecule.
This formula is determined by dividing the mass of each element by its atomic weight, and then dividing the result by the lowest of the results. The lowest result is 0.817 g/mol for carbon. This means that 2.61 g of carbon is equivalent to 3.17 moles of carbon. Thus, the ratio of elements in the compound is 3.17 moles of carbon, 7.44 moles of nitrogen, and 1.6 moles of hydrogen. Dividing each of these numbers by the lowest number (3.17) gives the ratio of 2 for carbon, 2.35 for nitrogen, and 0.5 for hydrogen. This ratio is simplified to 2:2:1, which corresponds to the empirical formula C2N3H2.
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What reagent causes the observed visual change in a positive Lucas test?
The observed visual change from a clear and colourless characteristic to a turbid, cloudy, and hazy characteristic, in a positive Lucas test, is caused by the Lucas reagent.
The Lucas Test is used to detect the presence of a primary alcohol.
When the test is positive, the mixture of the primary alcohol with the Lucas reagent changes from a clear and colourless characteristic to a turbid, cloudy, and hazy characteristic. This visual change is due to the reaction of the primary alcohol with the Lucas reagent which is a mixture of concentrated hydrochloric acid and zinc chloride.
The Lucas Test is used to detect the presence of a primary alcohol, and when a positive result is obtained, the reaction of the primary alcohol with the Lucas reagent, a mixture of hydrochloric acid and zinc chloride, causes the visual change from a clear and colourless characteristic to a turbid, cloudy, and hazy one.
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What is called proton number?
Proton number is called atomic number.
The chemical element's atomic number, also referred to as the nuclear charge number, is determined by the charge number of an atomic nucleus. This is the quantity of protons in the nucleus of each of that element's atoms. The atomic number refers to the number of protons in the nucleus of an atom. The amount of protons in an element determines what kind of element it is.
Both protons and electrons are equal in number in a neutral atom. The mass of an atom, represented by the letter M, is equal to the total of its protons and neutrons in the nucleus.
The number of protons in the atom's nucleus is therefore equal to the atomic number (Z). in an uncharged atom.
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How many of the carbons in the following compound are chiral center(s)? A) 0 B) 1 C) 2 D) 3 E) 4 or more
Answer:
3 (e
Explanation:
For each of the following balanced chemical equations, write all possible mole ratios: a. 2Ca + O2 ⎯→ 2CaO b. Mg + 2HF ⎯→ MgF2 + H2
The mole ratio of the reactants and products is
a. 2 : 1 : 2
b. 1: 2:1:1
The ratio of the mole quantities of any two compounds present in a balanced chemical reaction is known as the mole ratio. A comparison of the ratios of the molecules required to accomplish the reaction is given by the balancing chemical equation. The coefficients of each species in the reactants and products are used to calculate the mole ratio of the reactants and products. The mole ratio of the reactants and products, as demonstrated by the equation in the question, is 2: 1: 2 and 1:2:1:1 respectively.
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What is the exact molar mass of aspartame?
Aspartame, C14H18N2O5, has a molar mass of 294.307 grams/mol. As a result, the molecular weight of aspartame (C14H18N2O5) is equal to the molecular weights of 14 carbon atoms, 18 hydrogen atoms, 2, nitrogen atoms, and 5, oxygen atoms. As a result, aspartame (C14H18N2O5) has a molecular weight of 294.307 g/mol.
You can quickly determine the molar mass of aspartame if you have a periodic table nearby (C14H18N2O5), because combining the molar masses of the constituent atoms yields the molar mass of any molecule (or compound). Aspartic acid is known by the IUPAC name 2-Aminobutanoic acid, and its chemical formula is HOOCCH (NH 2) CH 2 COOH.
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The temperature inside a pressure cooker is 117°C. Calculate the vapor pressure of water inside the pressure cooker. What would be the temperature inside the pressure cooker if the vapor pressure of water was 2.85 atm?
The vapor pressure of water at its boiling point 100°C is 1 atm. Then the pressure at 117°C is 1.17 atm and the temperature of water at a pressure of 2.85 atm is 285°C.
What is boiling point ?Boiling point of a substance is the temperature at which it converts from liquid state to vapor state. At this temperature the vapor pressure of water vapor is equal to the atmospheric pressure that is 1 atm .
The temperature-pressure relation is written as:
P1 /T1 = P2/ T2
Now, the pressure inside the cooker at a temperature of 117°C is calculated as:
(1 atm × 117 °C) / 100 °C = 1.17 atm.
Thus, pressure at 117 °C is 1.17 atm. Then, If the pressure is 2.85 atm, then the temperature of water inside the pressure cooker is calculated as:
(2.85 atm × 117 °C) / 1.17 = 285 °C
Therefore, the temperature at 2.85 atm is 285 °C.
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Calculate the maximum amount of picric acid (in grams) that can be obtained if 0.552mL of phenol (density
It is critical to develop a PheDH with specificity and high activity since it is crucial for the manufacture of chiral pharmacological intermediates and the detection of phenylketonuria.
Here, a PheDH gene, pdh, was discovered that encodes a novel BhPheDH with 61.0% similarity to the previously identified PheDH from Microbacterium sp. In comparison to the PheDH from Nocardia sp., the BhPheDH demonstrated superior stability in hot environments (40–70°C) and optimal activity at 60°C and pH 7.0. Additionally, sodium salt has the potential to greatly boost both its activity and thermostability. The residual activity of the BhPheDH was found to be 1.8-fold higher than that of the control group following incubation for 2 hours in 3 M NaCl at 60 °C (without NaCl).
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7. Convert 25.0 grams of KMnO4 to moles.
K-39.098
Mn- 54.938
0-15.999
Answer in THREE Sig Figs with Units
when a set amount of marble chips (caco3) is added to a small amount of dilute hydrochloric acid, a reaction occurs. what should be done to decrease the rate of reaction the next time the experiment is performed
A tiny amount of weak hydrochloric acid is mixed with a quantity of marble chips (CaCO3), to decrease the rate of reaction we do decreasing the surface area of the marble chips, decreasing conc. HCL and many more.
Several ways are:-
1. Decreasing the surface area of the marble chips: By breaking the marble chips into smaller pieces, the surface area that is available for the acid to react with is reduced, slowing down the reaction.
2. Decreasing the concentration of the hydrochloric acid: By using a less concentrated solution of hydrochloric acid, the number of acid molecules available to react with the marble chips is reduced, slowing down the reaction.
3. Increasing the temperature: By performing the reaction at a lower temperature, the kinetic energy of the acid and marble chip molecules is reduced, slowing down the rate of collision between them, which slows down the reaction.
4. Using a catalyst: Addition of a catalyst to the reaction can change the reaction mechanism and decrease the activation energy needed for the reaction to occur, thus slowing down the reaction.
5. Using an inhibitor: An inhibitor is a substance that slows down the reaction by binding to the enzyme or catalytic site and preventing the substrate from binding.
It's important to note that these methods may also affect the overall yield of the reaction, so it's essential to use the appropriate method(s) for the specific experiment and goals.
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Who first identified the element radium? charles richard drew enrico fermi jonas salk marie curie
Marie Curie is credited with the discovery of radium. In 1898, she and her husband Pierre Curie discovered the element while experimenting with pitchblende, an ore containing uranium. They isolated a new substance, which they named radium, after the Latin word for ray.
What is uranium?Uranium is a naturally occurring element that is found in rocks and soil. It is a dense, silvery-white metal that has the highest atomic weight of all elements. Uranium is slightly radioactive and produces energy when it undergoes nuclear fission. It is an important source of energy generation and is used in nuclear reactors to produce electricity. Uranium also has a variety of other uses, such as in military applications, medical imaging, and industrial processes. It is a nonrenewable resource, and its supply is limited. Due to its radioactive nature, uranium must be handled with caution and special safety precautions must be taken to protect against the radiation it
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Answer: its D- Marie Curie
Explanation: I got it right on the test! hope this helps :)