1. The new volume of 500 mL of gas is approximately 385 mL.
2. The new pressure is 345.45 torr.
The relationship between pressure, volume, and temperature of a gas is described by Boyle's law, which states that the volume of a gas is inversely proportional to its pressure, provided that the temperature remains constant. To find the new volume, we need to use the equation:
V1 * P1 = V2 * P2
Where V1 is the initial volume, P1 is the initial pressure, V2 is the final volume, and P2 is the final pressure. Substituting the given values, we get:
V2 = V1 * (P1 / P2) = 500 mL * (750 torr / 980 torr)
So, the new volume of 500 mL of gas is approximately 385 mL.
The relationship between pressure, volume, and temperature for a fixed number of gas particles can be described by the ideal gas law: PV = nRT, where P is the pressure, V is the volume, n is the number of particles, R is the gas constant, and T is the temperature (in Kelvin). In this problem, we are given the initial pressure, volume, and temperature, and asked to calculate the final pressure after the volume expands.
2. Since the number of particles (n) and temperature (T) are constant, we can rearrange the equation to find the final pressure after the volume expands:
P1V1 = P2V2
P2 = P1 * (V1/V2)
Plugging in the given values:
P2 = 500 torr * (650 mL / 900 mL) = 345.45 torr
So the new pressure of the helium is 345.45 torr.
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H₂SO4 + 2NaOH --> H₂O + Na₂SO4
How many molecules of water are produced if 2.0g of sodium sulfate are produced in
the reaction above?
That would indicate that we also had 4 moles of water since 2 (moles H2O/molesNa2SO4). This implies that 4 moles of water should have produced.
In H2SO4 2NaOH Na2SO4 2H2O, which reactant is the limiting one?In this problem, sodium hydroxide serves as the limiting reagent and sulfuric acid as the surplus reagent.Since it is a neutralization reaction, its heat of neutralization is -57.3 kJ/mol.Demonstrates that for every mole of Na2SO4 created, we make two moles of water. The creation of 2.0 moles of sodium sulfate is reported. That would indicate that we also had 4 moles of water since 2 (moles H2O/molesNa2SO4). This implies that 4 moles of water should have produced.That would indicate that we also had 4 moles of water since 2 (moles H2O/molesNa2SO4). This implies that 4 moles of water should have produced.To learn more about sodium sulfate refer to:
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Rocco need to make two compound for an experiment he i performing, Lithium Chloride (LiCl) and Magneium Bromide (MgBr2). Both compound are formed uing the following chemical reaction:
Li Cl -> LiCl Heat
Mg Br -> MgBr2 Heat
When Rocco prepare thee compound, he alway ue the SAME AMOUNT of halogen but notice that he only end up with much le magneium compound compared to lithium compound. Anwer the following
1) I Rocco making or breaking bond when he prepare thee compound? Provide 2 piece of evidence for thi
2) What type of bond occur in thee compound, provide 2 piece of evidence for bond type
3) Uing your knowledge of oxidation number, explain WHY Rocco i only getting half a much magneium compound than lithium compound when preparing thee chemical. What SHOULD Rocco do to increae hi yield?
Roco being chemist preparing compounds, and ionic bonds. The answer of the questions are the given below:
1. Rocco is making bonds when he prepares the compounds.
Evidence:
Heat is being applied, which is a common way to provide energy to form chemical bonds.The products of the reactions, LiCl and MgBr2, are both compounds, indicating that new bonds have been formed.2. The bonds in these compounds are ionic bonds.
Evidence:
Lithium and chlorine, as well as magnesium and bromine, are both pairs of elements with large differences in electronegativity, indicating the formation of ionic bonds.The products of the reactions, LiCl and MgBr2, have a crystal lattice structure, which is characteristic of ionic compounds.3. Rocco may only be getting half as much magnesium compound because magnesium has a higher electronegativity than lithium, meaning that magnesium attracts electrons more strongly than lithium does. This means that the magnesium-bromine bond is stronger and therefore requires more energy to form. To increase his yield, Rocco could try to add more energy to the reaction, for example by using a higher temperature or longer reaction time.
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an original sample of the radioisotope fluorine-21 had a mass of 80.0 milligrams. only 20.0 milligrams of this original sample remain unchanged after 8.32 seconds. what is the half-life of fluorine-21? * (1) 1.04s
The half-life of fluorine-21 is approximately 15.8 seconds.
The half-life of a radioactive isotope is a measure of the time it takes for half of the original amount of the isotope to decay. In the case of fluorine-21, the original sample had a mass of 80.0 milligrams. After 8.32 seconds, only 20.0 milligrams of this original sample remained unchanged. To calculate the half-life of fluorine-21, we can use the equation:
Half-life = (8.32 seconds) × (ln(80.0 mg / 20.0 mg) / ln(2))
where ln(80.0 mg / 20.0 mg) is the natural logarithm of the ratio of the initial to remaining mass, and ln(2) is the natural logarithm of 2.
Half-life = 8.32 × (2.302 / 0.693) seconds
Half-life = approximately 15.8 seconds
So, the half-life of fluorine-21 is approximately 15.8 seconds. This means that, if we started with 80.0 milligrams of fluorine-21, after 15.8 seconds, only half of that original amount (or 40.0 milligrams) would remain unchanged.
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State your claim. Make sure your claim fully explains how infrared photography can be used to visualize temperature differences
My claim is that infrared photography can be used to visualize temperature differences by capturing the infrared radiation emitted by objects and converting it into visible light, with warmer objects appearing brighter and cooler objects appearing darker in the final image. This is because all objects emit some level of infrared radiation, and the amount of radiation emitted increases as the temperature of the object increases. By using a specialized camera that is sensitive to infrared radiation, it is possible to capture these differences in radiation and convert them into visible light, allowing the viewer to see temperature variations in the final image.
cyclic imine can be prepared from which following compounds? (a) 4-aminobutanol/h (b) 5-aminobutanol/h (c) 6-amino-2-hexanone/h (d) all of these
The right answer is (d) all of these. 4-aminobutanol/h, 5-aminobutanol/h, and 6-amino-2-hexanone/h can all be used to make cyclic imines.
In the intraperitoneal mouse bioassay, the newly identified class of marine biotoxins known as cyclic imines (CIs) causes a characteristically quick death. These poisons are macrocyclic substances having imine (a double bond between carbon and nitrogen) and spiro-linked ether moieties. chemical makeup. The cyclic imine group, which is typically found as a spiroimine, and the spiroketal ring system are two highly conserved moieties that make up the overall chemical structure of cyclic imine toxins. The macrocyclic ring of cyclic imine toxins has 14 to 27 carbon atoms.
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Consider the following bond lengths:c-0 = 143 pm, c=0 = 123 pm, c(triple bond) = 109 pm in a carbonate ion, all three c-0 bonds have the same length of 136 pm. why?
In a carbonate ion, the all three C - O bonds have the same length of 136 pm because the all resonance hybrid have the same bond order.
In the carbonate ion, CO₃²⁻ has the resonance structure. The total possible resonance structures are three in the carbonate ion. In the resonance structure of the carbonate ion , the all the C - O bonds have the partially double bond character. Therefore all the resonance hybrid , C - O bonds have the same bond order.
Thus, the all the three C - O bonds in the carbonate ion are same that is 136 pm.
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chalk stick is porous and has a lot of air in it. When kept in water, water slowly enters many of these spaces. Will a chalk stick float or sink in water - choose the best answer.
Answer:
Chalk is heavier it will sink and settle down
Which of these substances are heterogeneous mixtures?
I. steam
II. milk of magnesia
III. crude oil
IV. rubbing alcohol
a. II and III
b. I and IV
c. II, III and IV
d. I, III and IV
e. I, II, and III
The substances are the heterogeneous mixtures are : a. II and III that is the milk of magnesia and the crude oil.
The mixture are formed when two or the more substances are mix together without taking part in the chemical change. The heterogeneous mixture is the mixture where the components throughout the solution is not uniform. The mixture are two types :
Homogeneous mixtureHeterogeneous mixtureIn the heterogenous mixture the particles is distributed non uniformly and it can not be separated by the physical method.
Thus, the heterogenous mixture in the given option are the milk of the magnesia and the crude oil.
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what is f1 in the element table
f1 refers to the first electron shell or energy level in an element's electron configuration.
In the periodic table, elements are arranged based on the number of protons in their nucleus and the electron configuration of each element.
The electron configuration specifies the arrangement of electrons in each of the element's energy levels. The first energy level, denoted as f1, is the closest to the nucleus and can contain a maximum of 2 electrons.
This information is useful for determining the chemical and physical properties of elements, including their reactivity and bonding behavior.
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1. How did Moseley offering a different explanation than Mendeleev on the organization of elements advance science?
A. It helped prove that there are no undiscovered elements.
B. It established atomic numbers as the basis for the periodic table
C. It helped uncover previously undiscovered elements.
D. It established atomic mass as the basis for the periodic table.
2. Why is empirical knowledge important?
A. It provides science with facts.
B. It lets scientists conduct investigations
C. It turns experiences into facts.
D. It helps scientists make observations
Moseley offering a different explanation than Mendeleev on the organization of elements advance science by option B. It established atomic numbers as the basis for the periodic table
The empirical knowledge is important by option D. It helps scientists make observations.
What is the explanation about?Moseley's contribution to the organization of elements advanced science by establishing atomic numbers as the basis for the periodic table (Option B). This helped to improve the accuracy of the periodic table, making it possible to predict the properties of new elements based on their atomic number.
Therefore, Empirical knowledge is important because it provides science with facts (Option A). Empirical knowledge is based on observations and experiences, which can be tested and verified through experiments. This helps to build a solid foundation for scientific understanding, as empirical knowledge provides a basis for scientific theories and models.
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estimate the temperature at which ethanol would distill at 1 atm (760 mm hg)?
a) 350K
b) 370K
c) 330K
d) More information is needed to make this estimation
The temperature at which ethanol distill at 1 atm (760 mm hg) would be 350K.
Distillation, also known as classical distillation, is the process of separating the components or substances from a liquid mixture via selective boiling and condensation, often inside a still. Dry distillation is the process of heating solid materials to create gaseous products (which might condense into liquids or solids); this can entail chemical changes such as destructive distillation or cracking.
Distillation can result in either an essentially complete separation (resulting in nearly pure components) or a partial separation that increases the concentration of specific components; in either case, the process takes advantage of differences in the relative volatility of the mixture's components. Distillation is a unit operation of virtually universal relevance in industrial applications, although it is a physical separation process, not a chemical reaction.
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Consider a neutral atom of the following isotope of sulfur: 34/16S How many electrons, protons, and neutrons does the atom contain?
The number of electrons, protons, and neutrons does the isotope of 34/16 sulfur atom contain are 16, 16, and 18 respectively.
Is the proton's mass number the same?The atomic number is equal to the amount of protons in the atom's nucleus (Z). In a neutral atom, there are precisely as many electrons as protons. The overall number of protons and neutrons in the atom's nucleus is equal to the mass number (M) of the atom.
Atomic mass number = number of proton + number of neutron
The sulphur mass number => 34
Proton number = 16
Neutron => 34-16 => 18
What is the definition of mass number?The overall number of protons and neutrons in an atom's nucleus is termed as the mass number in nuclear physics.
What exactly is a neutron?Neutrons are neutral subatomic particles that are contained in all atomic nuclei, with the notable exception of common hydrogen. Its rest mass is 1.67492749804 1027 kg, which is somewhat greater than that of the proton but 1,838.68 times higher than that of the electron. It has no electric charge.
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polymers are obviously different from small molecules. how does poly- ethylene differ from oil, grease, and wax, all of these materials being essen- tially - ch2- ?
Polyethylene differs from oil, grease, and wax in a way that polythene is a tough plastic while the wax or grease is brittle solid.
Polyethylene is a long chain of ethylene, C2H6, which are molecules attached end-to-end in generally a straight chain. Oils, greases, and wax are a mixture of multiple hydrocarbon molecules which randomly combined in more of a mixture. Because of the high molecular weight of polythene, it is a tough plastic while the wax or grease is brittle solid.
What are the differences among polymers and small molecules?One major difference among polymers and small molecules or monomers are the characteristics which polymers exhibit. Polymers generally have higher viscosities, higher boiling points and can present improved mechanical strength over small molecules or monomers.
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identify x in the following nuclear reactions: (a)1h 9be → x n; (b)12c 1h → x; (c)15n 1h → 4he x.
The following nuclear reactions occur: 1h + 9be x + n (a) The resultant isotope of the process is represented by x. (b) 12c + 1h → x (15n + 1h 4he + x) The resultant isotope.
of the process is represented by x. Nuclear reactions are changes to an atom's nucleus that result in the production of new isotopes and/or the release of energy. They can happen naturally or be caused by blasting the nucleus with particles or radiation. Nuclear processes are classified into two types: nuclear fusion and nuclear fission. Nuclear fusion occurs when two light atomic nuclei unite to produce a heavier nucleus, releasing a significant quantity of energy. A heavy nucleus is divided into two lighter nuclei in nuclear fission, releasing a tremendous quantity of energy.
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12) You're throwing a pizza party for 15 people and figure that each person will eat 4 slices. You call up the pizza pallor and learn that each pizza pie will cost you $14.78 and it will be cut into 12 slices. How much is the pizza going to cost you to feed everyone? You only have $70. Will you have enough money?
$70 won't be enough to buy 15 pizzas. Since, the total money required to feed everyone is $73.9.
How to calculate the money required for to buy 15 pizzas?4 slices of pizza for each person
The amount of pizza required for 15 person => 15 x 4 = 60
12 slices get fro 1 pizza
Hence, the number pizza required => 60/12 => 5
The cost of 5 pizzas = 5 x $14.78 = $73.9
Is having financial difficulties normal?Everyone is worried about the rising cost of living right now since it is affecting their own finances. Issues about money can also affect our well-being and mental health. It's typical to experience depression or anxiety if you have to make difficult choices concerning what you can afford.
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based on the video you watched, what are the 2 common solvents used in nmr spectroscopy?
DMSO and deuterated chloroform are the most widely solvents used in NMR spectroscopy.
DMSO is the most widely used organic solvent in the NMR analysis due to its wide range of solvent constraints as well as its simple spectrum and having high boiling point. The reaction of the organic compounds with heavy water in the presence of a suitable catalyst which is used to produce deuterium solvents.
Deuterated chloroform, also called as chloroform-d, is the organic compound having formula C₂HCl₃ or CDCl₃. Deuterated chloroform is commercially available. It is easily produced and less expensive than to the deuterated dichloromethane. It is produced by the reaction of hexachloroacetone with deuterium oxide, using pyridine as a catalyst.
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In general, metals are characterized by which of the following properties (three best answers): A) brittleness B) chemical inertness C) electrically insulating D) high electrical conductivity E) high hardness F) high thermal conductivity G) low density H) low thermal conductivity
In general, metals are characterized by the listed metals (A) brittleness, (D) high electrical conductivity, (F) high thermal conductivity
1) Brittleness: Metals are known to be brittle, which means they have low ductility and tend to break or crack when subjected to stress, instead of deforming plastically. This property is due to the metallic bonding between atoms, which creates a rigid structure that is not easily deformed.
2) High electrical conductivity: Metals are good electrical conductors, meaning they allow electricity to flow easily through them. This property is due to the presence of free electrons in the metal's structure, which are able to move and carry electrical charges.
3) High thermal conductivity: Metals have high thermal conductivity, meaning they can easily transfer heat from one point to another. This property is due to the metallic bonding between atoms, which allows for efficient transfer of heat-carrying phonons throughout the metal's structure. This makes metals good choices for many industrial applications that require efficient transfer of heat, such as in electrical equipment, heat exchangers, and heat pipes.
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Describe the location and light reflected on the moon throughout the month
The location and light reflected on the moon throughout the month changes thanks to the moon's lunar phases :
New MoonWaxing CrescentWaxing GibbousFull MoonWaning CrescentWhat are some phases of the moon ?At the beginning of the lunar cycle, the Moon is located between the Sun and the Earth, and is not visible from Earth because it is not reflecting any sunlight. As the Moon moves away from the Sun, a thin crescent shape becomes visible, and it is illuminated on the right-hand side. This phase is called the Waxing Crescent.
The Moon continues to move away from the Sun, and more than half of its surface becomes illuminated. This is called the Waxing Gibbous phase. After two weeks, the Moon is located on the opposite side of the Earth from the Sun, and its entire visible surface is illuminated. This is called the Full Moon phase.
The Moon continues to move closer to the Sun, and less than half of its surface is illuminated. This is called the Waning Crescent phase.
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a gas mixture is made by combining 6.3 g each of ar, ne, and an unknown diatomic gas. at stp, the mixture occupies a volume of 14.24 l. what is the molar mass of the unknown gas?
The molar mass of unknown gas is 38.65 gm
We know that the Ideal gas equation is
PV = n R T
at Standard temperature and pressure
P = 1 atmospheric pressure
T= 273.15 Kelvin
R = 8.3144598
V= 14.24
number of moles = [tex]\frac{given mass}{molar mass}[/tex]
Ar molar mass= 40
Ar moles = 6.3/40
Ne = 20
Ne moles = 6.3 / 20
m= unknown gas
m = 6.3 / m
We know that at STP 1 mol of any gas is 22.4 l
we can obtain the total number of moles of the mixture by dividing it by 22.4L as 14.24/22.4= 0.635
0.635 = Ar moles + Ne moles + unknown gas moles
0.635 = 0.472 + 6.3/ m
m = 38.65 gm
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what is the sum of the numbers of neutrons and electrons in the ion 116sn3 ?
The sum of the numbers of neutrons(present in the atomic nucleus) and electrons(present outside the atomic nucleus) in the ion 116sn3+ is 113.
Atomic number of Sn (Tin) is 50. This means that isolated Sn atom has 50 electrons. Number of electrons = number of protons in nucleus. So, isolated Sn atom has 50 protons in nucleus. According to question, we have Sn3+ ion. This ion lost 3 electrons from its valence shell. But, the 50 protons still remain in its nucleus. Now, atomic mass = number of protons + number of neutrons in atomic nucleus. Given atomic mass number is 116. Hence, 116 = 50 + number of neutrons in atomic nucleus. Thus, number of neutrons in atomic nucleus = 116 - 50 = 66. The question asked for the sum of the numbers of neutrons and electrons in the ion 116sn3+ , which is 66+ 47 = 113.
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Of the following, indicate which are pentose sugars.D-FructoseD-ThreoseL-GlucoseD-SorboseGlyceraldehydeNone of the Above
Pentose sugars include (Glyceraldehyde) and (None of the Above).
c are a class of monosaccharides, which are simple sugars, consisting of five carbon atoms. They are crucial components of many biological processes, including the synthesis of nucleic acids (DNA and RNA) and the production of energy. Ribose, which is a component of RNA, is the most prevalent pentose sugar. Xylose, a pentose sugar that is present in many plant cell walls and is utilised as a sweetener, is a further significant pentose sugar. Pentose sugars, in contrast to hexose sugars (such as glucose and fructose), cannot be digested by humans and must be consumed through diet. They are crucial for the creation of biofuels as well since they may be fermented to create ethanol. In conclusion, pentose sugars are essential parts of numerous biological systems.
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2) How much heat in kJ is
required to boil 50.0 grams of
water?
Answer:
The heat required to boil water is called the heat of vaporization, and it is the amount of energy required to change the state of a substance from a liquid to a gas at a constant temperature. The heat of vaporization for water is approximately 40.7 kJ/mol or 2257 J/gram.
To calculate the heat required to boil 50.0 grams of water, you would multiply the heat of vaporization (2257 J/g) by the number of grams of water:
Heat (J) = 2257 J/g x 50 g
Heat (J) = 112,850 J
To convert Joules to kilojoules (kJ), divide by 1000.
Heat (kJ) = 112,850 J / 1000 = 112.85 kJ
Therefore, it takes 112.85 kJ of heat to boil 50.0 grams of water.
what is the molarity of a solution that was prepared by dissolving 82.0 g of CaCl2 in enough water to make 812 mL of solution
The molarity of a solution that was prepared by dissolving 82.0 g of calcium chloride in enough water to make 812 mL of solution is 0.91M.
How to calculate molarity?Molarity is the concentration of a substance in solution, expressed as the number moles of solute per litre of solution
The Molarity of a solution can be calculated using the following formula:
Molarity = no of moles ÷ volume
According to this question, a solution was prepared by dissolving 82.0 g of calcium chloride in enough water to make 812 mL of solution. The molarity can be calculated as follows:
no of moles of Calcium chloride = 82.0g ÷ 110.98 g/mol = 0.74 mol
Molarity = 0.74 ÷ 0.812 = 0.91M
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oxygen, whose atomic number is eight, has three stable isotopes: 16o, 17o, and 18o. explain what this means in terms of the number of protons and neutrons.
The number of protons and neutrons in 16o will be 8 protons + 8 neutrons, 17o will be 8 protons + 9 neutrons and 18o will be 8 protons +10 neutrons.
Isotopes are the two or more types of atoms (or nuclides is the technical term) that have the same atomic number (number of protons in their nuclei) as well as the position in the periodic table (and hence belong to the same chemical element), and that is differ in nucleon numbers (mass numbers) due to the different numbers of neutrons in their nuclei
Oxygen has three stable isotopes: 16o, 17o, and 18o. The atomic number of an element is the total number of protons in an isotope. The number of neutrons is the difference between the mass as well as the atomic number
16= 8 protons + 8 neutrons
17= 8 protons + 9 neutrons
18= 8 protons +10 neutrons
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deduce how many carbon and hydrogen atoms are in a molecule of e110
Sunset yellow (E110) is a molecule with 11 carbon atoms and 17 hydrogen atoms.
Sunset yellow (E110) is a synthetic food dye with the chemical formula C16H10N2O7S. The number of carbon atoms in the molecule can be determined by counting the number of carbon atoms in the chemical formula. In this case, there are 16 carbon atoms in the molecule.
The number of hydrogen atoms can be estimated by using the general formula for organic compounds, which is CnH2n+2, where n is the number of carbon atoms. If we plug in n = 16 into this formula, we get C16H2(16)+2 = C16H34.
This is the theoretical number of hydrogen atoms in the molecule, but it's possible that some of these hydrogen atoms have reacted with other elements to form different chemical compounds.
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what environmental advantages does the use of carbon dioxide as a blowing agent have over the use of cfcs and hydrocarbons
The use of carbon dioxide as a blowing agent has several environmental advantages over the use of CFCs and hydrocarbons.
Carbon dioxide is a naturally occurring gas and is non-toxic, non-flammable, and non-ozone depleting. It is also more energy efficient than its alternatives, resulting in lower energy costs.
Additionally, the use of carbon dioxide as a blowing agent reduces the need for other more harmful blowing agents, helping to reduce the environmental impact of their production and use.
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buffer a contains 100 mm nacl and 250 mm mg cl2. the stock concentration of nacl is 1m and mgcl2 is 2m. what are the volumes of the stock solutions of nacl and mgcl2 needed to prepare 500 ml of buffer a?
We would need stock solutions of 20 ml of 1 M NaCl and 50 ml of 2 M MgCl₂ to prepare 500 mL of buffer A (100 mM NaCl and 250 mM MgCl₂).
The amount of NaCl and MgCl2 needed can be calculated using the formula for buffer concentration:
C1 × V1 + C2 × V2 = C_buffer × V_buffer
where C1 and C2 are the stock concentrations of NaCl and MgCl₂, V1 and V2 are the volumes of NaCl and MgCl₂ stock solutions needed to prepare the buffer, and C_buffer and V_buffer are the final concentration and volume of the buffer.
We know the final concentration of the buffer (100 mM NaCl and 250 mM MgCl₂) and the volume of the buffer (500 mL), so we can solve for the volumes of the stock solutions needed:
V1 = (C_buffer × V_buffer - C2 × V2) / C1
V1 = (100 × 0.5 - 250 × V2) / 1000
V2 = (C_buffer × V_buffer - C1 × V1) / C2
V2 = (100 × 0.5 - 1000 × V1) / 250
V1 = (100 × 0.5 - 250 × (100 × 0.5 - 1000 × V1) / 250) / 1000
V1 = (100 × 0.5 - 250 × 100 × 0.5 / 250 + 250 × 1000 × V1 / 250) / 1000
V1 = (100 × 0.5 - 100 × 0.5 + 1000 × V1) / 1000
V1 × 1000 = 100 × 0.5 / 1000
V1 = 100 × 0.5 / 1000
V1 = 0.05 L = 50 mL
So the volume of the stock solution of 2 M MgCl₂ is 50 ml.
V2 = (100 × 0.5 - 1000 × 50 mL) / 250
V2 = (100 × 0.5 - 1000 × 0.05 L) / 250
V2 = (100 × 0.5 - 50) / 250
V2 = 0.2 L = 20 mL
So the volume of the stock solution of 1 M NaCl is 20 ml.
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the diameter of the he h e atom is approximately 0.10 nm n m . calculate the density of the he atom in g/cm3 g / c m 3 (assuming that it is a sphere). express your answer in grams per cubic centimeter.
The density of the Helium atom is 9.5 * 10^35 g/cm^2.
What is density?Density is a measure of mass per unit of volume of a substance or object. It is calculated as the ratio of the mass of an object to its volume and is usually expressed in kilograms per cubic meter (kg/m^3) or grams per cubic centimeter (g/cm^3).
We know that the mass of the atom of the helium is 4 g and the density of the atom is 0.10 nm or 1 * 10^-12 cm.
Volume of the atom = 4/3 πr^3
= 4.2 * 10^-36 cm^3
Then we must write that;
Density = mass/volume
Density = 4 g /4.2 * 10^-36 cm^3
Density = 9.5 * 10^35 g/cm^2
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A Grignard reaction will fail in the presence of which species?
A diethylether
Balkenes
C aromatic groups
D water
The Grignard reaction will fail in the presence of water as the Grignard reagent will get destroyed by reacting with acidic hydrogen atoms of water.
Hence, D. water is the correct option.
The Grignard reaction is basically an organometallic chemical reaction which involves a Grignard reagent. A Grignard reagent is the alkyl, vinyl, allyl, or aryl-magnesium halides. It is reacted with a particular carbonyl group which is in an aldehyde or in a ketone. This reaction is crucial for the formation of the carbon–carbon bonds.
The Grignard reagent tends to get destroyed by the reaction with acidic hydrogen atoms present in the water, phenols, alcohols, or in the carboxylic acid groups. Therefore, Grignard reaction fails in the presence of water.
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Which diagram below represents the nucleus of an atom. How many different elements are represented by the diagrams
From the given diagrams, all diagrams represent the nucleus of an atom.
The number of different elements represented by the diagrams is three elements.
What is the nucleus of an atom?The center of an atom's small, compact region made up of protons and neutrons are known as the atomic nucleus.
The nucleus contains the mass of an atom.
The sum of the number of neutrons and protons in the nucleus of an atom gives the atomic number of an atom.
When the nucleus of an atom contains the same number of protons but a different number of neutrons, the atoms are called isotopes.
Learn more about isotopes at: https://brainly.com/question/24698773
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