Final answer:
To prepare 0.50 mL of a 0.15 M NaOH solution from a 6.00 M NaOH solution, you would need 12.5 μL of the concentrated solution according to the dilution formula, which is not listed among the provided answer options.
Explanation:
The volume of 6.00 M NaOH solution required to prepare 0.50 mL of 0.15 M NaOH solution can be found using the dilution formula M1V1 = M2V2, where M1 and V1 are the molarity and volume of the concentrated solution, and M2 and V2 are the molarity and volume of the diluted solution, respectively. Plugging the known values into the equation: (6.00 M)(V1) = (0.15 M)(0.50 mL) ⇒ V1 = (0.15 M)(0.50 mL) / (6.00 M) = 0.0125 mL or 12.5 μL.
Since none of the provided answer choices (a) 12.5 mL, (b) 25 mL, or (c) 30 mL match this result, it seems there might be a typo or a misprint in the question. To prepare 0.50 mL of a 0.15 M solution from a 6.00 M solution, you would need substantially less than 1 mL of the concentrated solution. The likely correct volume needed, based on the question's data, would be 12.5 μL, which is not listed as an option in the question.
An enzyme is a protein that acts as a catalyst in a chemical reaction that takes place in a living thing true or false
Number of moles in 11.82 g gold
Final answer:
The number of moles in 11.82 g of gold is calculated by dividing the mass of the gold by its molar mass. The atomic weight of gold is approximately 197 g/mol, so the calculation is 11.82 g divided by 197 g/mol.
Explanation:
The calculation of the number of moles in a given mass of a substance is a fundamental concept in chemistry. The number of moles (n) can be determined using the formula:
n = mass (g) / molar mass (g/mol)
For gold (Au), the atomic weight is approximately 197 g/mol, which is its molar mass. Therefore, to find the number of moles in 11.82 g of gold, you divide the mass of the gold by the molar mass of gold as follows:
n = 11.82 g / 197 g/mol
This calculation will give you the number of moles of gold in the sample. The density of gold and Avogadro's number are not directly needed for this calculation, but they are commonly referenced when discussing the properties of elements and the mole concept.
Which nuclear emission has the greatest penetrating power?
b. beta particle
a. proton
c. gamma radiation
d. positron
Answer:gamma radiation
Explanation:
Among the nuclear emissions including proton, beta particle, positron and gamma radiation, gamma radiation has the greatest penetrating power. It needs dense materials like lead or concrete to be shielded.
Explanation:Of the nuclear emissions listed: a. proton, b. beta particle, c. gamma radiation, and d. positron, the one with the greatest penetrating power is c. gamma radiation. Unlike other particles, gamma radiation is a type of electromagnetic radiation, similar to X-rays. This means it is not a charged particle, allowing it to penetrate materials more easily.
For instance, alpha and beta particles would be blocked by a piece of paper or the surface of the human skin, but gamma rays can penetrate much deeper, requiring dense materials like lead or concrete for shielding.
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The various components of crude oil are separated in a refinery based on differences in
Crude oil components are separated based on their boiling points using fractional distillation in a refinery.
Explanation:The various components of crude oil are separated in a refinery based on differences in their boiling points. This process, known as fractional distillation, takes advantage of the fact that different compounds in crude oil have different boiling points.
In a refinery, crude oil is heated in a furnace and the vaporized oil is then passed through a tall column called a fractionating column. As the vapor rises through the column, it cools down, and the compounds with higher boiling points condense and are collected at different levels in the column.
For example, at the bottom of the column, heavy compounds like bitumen and fuel oil are collected, while lighter compounds like gasoline and kerosene are collected at higher levels. This allows the refinery to separate and collect various components of crude oil for further processing.
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How many moles of Pb(NO3)2 are required if 8 moles of PbCI2 are produced?
Suppose you wish to make 0.879 l of 0.250 m silver nitrate by diluting a stock solution of 0.675 m silver nitrate. how many milliliters of the stock solution would you need to use?
Answer is: 325.5 mL of the stock solution.
c₁(AgNO₃) = 0.675 M.
V₂(AgNO₃) = 0.879 L.
c₂(AgNO₃) = 0.250 M.
V₁(AgNO₃) = ?
c₁ -
original concentration of the solution, before it gets diluted.
c₂
- final concentration of the solution, after dilution.
V₁
- volume to
be diluted.
V₂ - final volume after
dilution.
c₁ · V₁ = c₂
· V₂.
V₁(AgNO₃) = c₂ · V₂ ÷ c₁.
V₁(AgNO₃) = 0.250 M · 0.879 L ÷ 0.675 M.
V₁(AgNO₃) = 0.325 L · 1000 mL = 325 mL.
To make 0.879 l of 0.250 m silver nitrate from a 0.675 m stock solution, use the relationship between initial and final concentrations and volumes (M1V1 = M2V2). By substituting the given values and solving for V1, we can find the needed volume of the stock solution in liters and then convert that volume to milliliters by multiplying by 1000.
Explanation:To answer this question, we need to use the formula related to molarity (M = moles/liters), which is M1V1 = M2V2. It is a relationship between the initial concentration (M1) and volume (V1) of stock solution and the final concentration (M2) and volume (V2) of dilute solution.
In this case, the student wishes to make 0.879 l (V2) of 0.250 m (M2) silver nitrate by diluting a stock solution of 0.675 m (M1) silver nitrate. Substituting these values into the formula M1V1 = M2V2, we can find the volume of the stock solution needed (V1).
So, the calculation would be: (0.675 M) V1 = (0.250 M)(0.879 L).
To solve for V1, divide both sides by 0.675 M and the result is: V1 = (0.250 M)(0.879 L) / 0.675 M. This gives the volume of the stock solution you need to use in liters. To convert this to milliliters (since the question asked for the volume in milliliters), multiply by 1000.
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2) Pick the statement about the Bohr model of the hydrogen atom that is NOT true. A) The energy of each Bohr orbit is quantized. B) An electron in a stationary state does not emit radiation. C) When an electron jumps to a higher state, energy is absorbed. D) When an electron jumps from one state to another, the electron must gain or lose just the right amount of energy to actually travel the distance between the orbits.
Answer: When an electron jumps from one state to another, the electron must gain or lose just the right amount of energy to actually travel the distance between the orbits.
Explanation:
Bohr in his structure of atom explained that protons which are positively charged particles and neutrons which are neutral particles, are contained in the center of an atom called as nucleus.
The electrons which are negatively charged particles revolve around the nucleus in fixed orbit or shell or energy levels which are termed as quantized. These energy levels are stable and are stationary along with different energy value. The electron remains in the state until energy is absorbed or released.
The electrons absorb energy when it moves from lower energy state to higher energy state. The electrons lose energy when it moves from higher energy state to lower energy state and thus emit radiations corresponding to the energy gap.
Thus the statement when an electron jumps from one state to another, the electron must gain or lose just the right amount of energy to actually travel the distance between the orbits is incorrect because energy is absorbed when electron jumps from one state to another.
The energy is lost when electron falls from one state to another.
Answer: An electron in a stationary state does not emit radiation
Explanation:
I put that on usa test prep and it says correct. the other person who answered this is wrong
Which formulas and their respective names match? I) Li3N lithium nitride II) H2S hydrogen sulfite III) SO2 sulfur dioxide IV) AlF3 aluminum trifluoride
a.I and II
b.I and III
c.II and IV
d.I, II, and III?
Answer: The correct answer is Option b.
Explanation:
Ionic compound is defined as the compound which is formed by the complete transfer of electrons from one atom to another atom. These compounds are usually formed between metals and non-metals.
Covalent compounds are defined as the compounds which are formed by the sharing of electrons between two atoms. These compounds are formed between two non-metals.
The nomenclature of covalent compound is given by:
The less electronegative element is written first.The more electronegative element is written then, and a suffix is added with it. The suffix added is '-ide'.If atoms of an element is greater than 1, then prefixes are added which are 'mono' for 1 atom, 'di' for 2 atoms, 'tri' for 3 atoms and so on..The nomenclature of ionic compounds is given by:
Positive ion is written first.The negative ion is written next and a suffix is added at the end of the negative ion. The suffix added is '-ide'.For the given compounds:
(I) [tex]Li_3N[/tex]: This is an ionic compound and hence, its name is lithium nitride.
(II) [tex]H_2S[/tex]: This is a covalent compound and hence, its name is hydrogen sulfide.
(III) [tex]SO_2[/tex]: This is a covalent compound and hence, its name is sulfur dioxide.
(IV) [tex]AlF_3[/tex]: This is an ionic compound and hence, its name is aluminium fluoride.
Hence, the correct answer is Option b.
Scientists have been able to insert genes from bacteria into the DNA of corn plants. This gives some species of corn additional resistance to pests. Why would this breakthrough be beneficial to humans?
A. Farmers will increase their use of chemicals that kill pests.
B.Less chemical residue will be found in the air and water.
C.Bacteria will flourish inside the corn plants.
D.The corn will cause illness in humans or animals.
E.The amount of corn produced per acre of farmland will decrease.
Scientists have been able to insert genes from bacteria into the DNA of corn plants. This gives some species of corn additional resistance to pests.
This would breakthrough be beneficial to humans as " less chemical residue will be found in the air and water"
What is DNA?Deoxyribonucleic acid (DNA) is just a polymer made up of two polynucleotide chains whose coil around with each other to create a double helix which carries genetic instructions including all living things and viruses' formation, function, growth, but also reproduction.
What is chemical residue?The remnants of a chemical or even its decomposition products may remain in or on prepared produce and are referred to as chemical residues. Chemical residues could form as a result of directly processing produce with either a chemical product or as a result of chemical exposure.
Therefore, the correct answer will be option (B).
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What is the correct form of the equilibrium constant for the reaction of hydrogen and oxygen to form water? the equation is:?
1. Versions of atoms with different amounts of neutrons are called ________.
If the thorium-232 isotope emits an alpha particle, what would be the atomic number of the resulting atom?
Answer is: atomic number
of resulting atom is 88.
Alpha particle is nucleus of a helium-4 atom, which is made of
two protons and two neutrons.
Nuclear reaction: ²³²Th → ²²⁸Ra + α (alpha
particle).
Alpha decay is radioactive decay in which an atomic nucleus emits an alpha particle (helium nucleus) and transforms into an atom with an atomic number that is reduced by two and mass number that is reduced by four.
how are homologous structures such as forelimbs evidence for evolution ?
The study of the gradual change of an organism over a period of time is called evolution.
What is a homologous organ?Those structures of different species which have the same structure but the different function is called homologous organ.According to the question, the forelimbs are great evidence of evolution because the forelimbs give the ancestral connection between two species.
For example - the forelimbs of the bat and the human have the same structure but different functions.
Hence, the correct answer is mentioned above.
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which is the next logical step in balancing the given equation? CS2(1)+Cl2(g) CCl4(1) S2Cl2(1)
Match the term with its definition. A. Bed load A strip of land next to a river that is often very fertile B. Headwater The beginning of a river C. Suspended load Large boulders carried along by a river D. Flood plain Small rocks carried along by a river
Bed load - Large boulders carried along by a river
Headwater - The beginning of a river
Suspended load - Small rocks carried along by a river
Flood plain - A strip of land next to a river that is often very fertile
(APEX Verified 2020)
Which noble gas would most likely form a compound with fluorine?
There are some exceptions to the rule that noble gases do not normally react with other elements to form compounds. Xe can combine with fluoride and oxide to form compounds.
What is noble gas ?Under standard conditions, the noble gases are all odorless, colorless, monatomic gases with very low chemical reactivity. Helium, neon, argon, krypton, xenon, and radioactive radon are the six naturally occurring noble gases.
In order of mass, the noble gases are helium, argon, krypton, xenon, and radon. Noble gases are so named because they are so magnificent that they do not react with anything in general. Because of this, they are also known as inert gases.
Noble gases, which are most commonly found as monatomic gases, have completely filled outer electron shells and thus have no desire to react with other elements, resulting in very few compounds.
Thus, There are some exceptions to the rule that noble gases do not normally react with other elements to form compounds.
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What happens to the density of the core of a high-mass star as it collapses?
What does the half-life of a radioisotope correspond to?
The half-life of a radioisotope corresponds to the length of time required for half of a sample of radioactive material to decay
what happens when sulphur trioxide reacts with concentrated sulphur acid ?
Scientists have: (Select all that apply.)
a. observed amino acids forming spontaneously
b. demonstrated how amino acids can form from the environment
c. confirmed that the ultimate source of amino acids and proteins is from plants
d. not yet determined the source of amino acids
Why are valence electrons important? Why do elements bond? What are two ways elements complete their valence?
what is the molarity of a 650. mL solution containing 64 grams of NaCl?
Natural gas is primarily composed of ________. natural gas is primarily composed of ________. methane sulfur dioxide nitrogen oxygen nitrite
Natural gas is primarily composed of methane, which is a colorless, odorless, and highly flammable hydrocarbon produced through the natural decomposition of organic materials.
Explanation:Natural gas is primarily composed of methane. Methane, abbreviated as CH4 or carbon tetrahydrate, is a hydrocarbon that is a main component of natural gas. The natural process of decomposition of organic materials in the lack of oxygen forms methane. This gas is colorless, odorless, and highly flammable. Ensuring safety for use in homes, a rotten egg-like smell is often added to it.
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A 20.9 ml sample of 0.267 m koh solution required 29.1 ml of aqueous acetic acid solution in a titration experiment. calculate the molarity of the acetic acid solution. answer in units of m.
Krypton-79 has a half-life of 35 hours. how many half-lives have passed after 105 hours?
Three half-lives of Krypton-79, which has a half-life of 35 hours, have passed after a period of 105 hours.
Explanation:The concept underlying the question is related to the half-life of a radioactive substance. The half-life is the amount of time it takes for half of the substance to decay. Therefore, in the situation described in the question, the half-life of Krypton-79 is 35 hours.
If we have a time period of 105 hours, we can find the number of half-lives that have passed by dividing the total time by the half-life. So, 105 hours divided by 35 hours per half-life equals 3.
Therefore, 3 half-lives have passed in 105 hours for Krypton-79.
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What is the ph of an acetic acid solution if 10 drops are titrated with 70 drops of a 0.65 m koh solution? (ka for acetic acid = 1.8 x 10-5)?
A solution is made by dissolving 24 g of NaCl to make 475 ml of solution. Calculate the concentration in units of molarity by following these steps: a) Convert the grams of NaCl to moles of NaCl. b) Calculate the liters of solution by dividing the given milliliters by 1000. c) Divide moles by the liters of solution.
Final answer:
The molarity of a solution created by dissolving 24 g of NaCl in 475 mL of water can be calculated by converting the mass to moles, finding the solution's volume in liters, and dividing the moles by the volume. The result is approximately 0.864 M.
Explanation:
To calculate the molarity of a solution in which 24 g of NaCl is dissolved to make 475 mL of solution, follow these steps:
Convert the mass of NaCl to moles using the molar mass of NaCl (58.44 g/mol). To do this, divide the given mass by the molar mass: 24 g ÷ 58.44 g/mol = 0.4106 mol NaCl.Calculate the liters of solution by dividing the volume in milliliters by 1000: 475 mL ÷ 1000 = 0.475 L.To find the molarity, divide the number of moles of NaCl by the volume in liters: 0.4106 mol ÷ 0.475 L = approximately 0.864 molarity.If 22.50 mL of a sodium hydroxide solution is necessary to neutralize 18.50 mL of a 0.1430 M HNO3 solution, what is the concentration of the NaOH? (Report your answer in molarity.)
When a chemical reaction occurs, the physical and chemical properties of the reactants are the same as the properties of the products. truefalse?
Answer:
False
Explanation:
You definitely won't see this nor need this but the Law of Conservation of Mass states that matter can neither be created nor destroyed in a chemical reaction.
I believe the answer is false
Question 6 if a gas pressure gauge reads 32.0 psi, what is the pressure in inches of mercury? 165 in. hg 15.7 in. hg 65.1 in. hg 32.0 in. hg 6.19 in. hg
Answer:
65.1
Explanation: