Answer:
False
Explanation:
When atoms join together to form molecules, they are held together by chemical bonds. These bonds form as a result of the sharing or exchange of electrons between the atoms. It is only the electrons in the outermost shell that ever get involved in bonding.
I need help with 9-13
1) Hydrogen: 1.5 g / 1.008 g/mol = 1.488 mol.
2) Atomic hydrogen: 1.488 mol / 0.999 mol = 1.5
3) As a result, the empirical formula is C2 H3, and the mole ratio is 2: 3.
C₂H₃
What is an element?Primitive human societies first discovered native minerals like carbon, sulfur, copper, and gold.
This is where the history of the elements' discovery and use began (though the concept of a chemical element was not yet understood).
Throughout human history, attempts to categorize things like this gave rise to the concepts of classical elements, alchemy, and numerous related hypotheses.
The work of Dmitri Mendeleev, a Russian chemist who produced the first recognizable periodic table in 1869, contributed significantly to modern knowledge of the elements.
The elements are arranged in this table according to increasing atomic number into rows (or "periods") and columns (or "groups") that have similar physical and chemical characteristics on a regular basis.
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what type of bonding creates a substance that has the ability to conduct electricity when solid?
Metallic bonding is a common characteristic of a material that may conduct electricity when it is solid. The movement of electrical power or charge is known as electricity.
Metallic bonding is the kind of bonding that results in a material with the capacity to conduct electricity when it is solid. The valence electrons of metal atoms become delocalized and free to roam about the crystal lattice during metallic bonding, forming a "sea" of electrons. As they are able to transfer electricity through solid materials, these delocalized electrons are what give solid materials their electrical conductivity. Copper, aluminium, and gold are a few examples of metals that display metallic bonding and electrical conductivity in the solid form. A fundamental component of the natural world, electricity is also one of the most extensively utilised energy sources.
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liquid water is more dense than ice because a. a liquid h 20 molecule has more mass than an ice h 20 molecule b. a chemical change occurs when ice melts that causes the mass of water to increase c. when ice melts there is an increase in the amount of water molecules d. there are a greater number of h 20 molecules per unit of volume in liquid water than ice
The correct answer is "d. there are a greater number of H2O molecules per unit of volume in liquid water than ice."
The density of a substance is defined as its mass per unit volume. In general, liquids are more dense than solids because the molecules in a liquid are more closely packed together and have more freedom to move than the molecules in a solid. When ice (a solid) melts to form liquid water, the water molecules are no longer held in a fixed arrangement and can move more freely. This increased mobility results in a more compact packing of the molecules, leading to an increase in the density of the liquid water compared to ice.In other words, there are more H2O molecules per unit of volume in liquid water than in ice, making liquid water more dense than ice.
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match the following aqueous solutions with the appropriate letter from the column on the right. fill in the blank 1 1. 0.22 m bas a. lowest freezing point fill in the blank 2 2. 0.19 m niso4 b. second lowest freezing point fill in the blank 3 3. 0.20 m nh4br c. third lowest freezing point fill in the blank 4 4. 0.34 m ethylene glycol(nonelectrolyte) d. highest freezing point
0.22 M BaS -> d. highest freezing point0.19 M NiSO4 -> c. third lowest freezing point0.20 M NH4Br -> b. second lowest freezing point0.34 M Ethylene Glycol (nonelectrolyte) -> a. lowest freezing point
When a solute is added to a solvent, it lowers the freezing point of the solution. The extent to which the freezing point is lowered depends on the concentration of the solute particles in the solution. A higher concentration of solute particles leads to a greater decrease in the freezing point, resulting in a lower freezing point. The freezing point of a solution is directly proportional to the concentration of solute particles. Among the given solutions, the ethylene glycol solution will have the lowest freezing point as it is a nonelectrolyte and will not dissociate into ions in solution. The rest of the solutions contain electrolytes and will dissociate into ions in solution, increasing the concentration of solute particles and decreasing the freezing point. The highest freezing point will be observed in the BaS solution, which has the highest concentration of solute particles, while the NH4Br solution has a lower concentration of solute particles and will have the second lowest freezing point. The NiSO4 solution will have a slightly lower concentration of solute particles and will have the third lowest freezing point.
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can you substitute confectioners sugar for granulated sugar.true/false
The answer is true, confectioners sugar can be substituted for granulated sugar but it may not always be an exact 1:1 substitution.
Confectioners sugar (also known as powdered sugar or icing sugar) can be substituted for granulated sugar in some recipes, but it may not always be an exact 1:1 ratio substitution.
Confectioners sugar is a very fine powder that contains cornstarch, which is added to prevent caking. Due to its fine texture, it can dissolve quickly in recipes and can add a slightly different texture to baked goods. It can also affect the sweetness level of the recipe as it usually contains cornstarch or other additives, which can also influence the texture of the final product.
In general, substituting confectioners sugar for granulated sugar works best in recipes that don't require the sugar to dissolve completely, such as frosting or glazes. For recipes that require the sugar to dissolve, such as in baking or making meringues, it's best to use granulated sugar.
So, the answer is "True", but the substitution may not be appropriate for all recipes.
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if 0.75 grams of benzophenone was allowed to react with 0.20 grams of sodium borohydride, what is the percent yield if 0.42 grams of diphenylmethanol was produced?
The actual yield of diphenylmethanol was 0.42 grams. 0.75 grams of benzophenone was reacted with 0.20 grams of sodium borohydride to produce diphenylmethanol.
The percent yield is a measure of how efficient a chemical reaction is at producing the desired product. It is calculated by comparing the actual yield of the product to the theoretical yield, which is the amount of product that would be produced if the reaction proceeded perfectly. The percent yield can be calculated using the formula:
percent yield = (actual yield / theoretical yield) x 100%
The balanced equation for this reaction is:
C13H10O + 4H3B→C13H14O + 4B(OH)3
The molar mass of benzophenone is 182.2 g/mol, and the molar mass of diphenylmethanol is 198.3 g/mol. Using the stoichiometry of the balanced equation, the theoretical yield of diphenylmethanol can be calculated:
0.75 g benzophenone * (1 mol benzophenone / 182.2 g benzophenone) * (1 mol diphenylmethanol / 1 mol benzophenone) * (198.3 g diphenylmethanol / 1 mol diphenylmethanol) = 0.81 g diphenylmethanol
Therefore, the percent yield of the reaction can be calculated as:
percent yield = (0.42 g / 0.81 g) x 100% = 51.9%
The percent yield of this reaction is relatively low, indicating that there may have been some loss of product or incomplete conversion of reactants. Factors such as side reactions, impurities, and incomplete mixing can all contribute to a lower yield.
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when the bromothymol blue solution turned from blue to yellow what did that tell us about the ph of the solution?
Because the pH of amniotic fluid is usually > 7.2, bromothymol turns blue when it comes into contact with the fluid leaking from the amniotic membrane. The pH of the vagina is usually acidic, so blue indicates the presence of amniotic fluid.
Bromothymol blue is a pH indicator. It is mainly used in applications where substances with a relatively neutral pH (approximately 7) must be measured. It is commonly used to measure the presence of carbonic acid in a liquid. It is usually sold in solid form as the sodium salt of an acid indicator.
Bromothymol blue can be used to monitor photosynthetic activity or as an indicator of respiration (turns yellow when CO2 is added). A common demonstration of the properties of the BTB pH indicator involves exhaling into a neutral BTB solution through a tube. The solution changes color from green to yellow as CO2 is absorbed into the solution by breathing to form carbonic acid. Therefore, the BTB is commonly used in science classes to prove that the more muscles involved, the higher the CO2 emission.
It can also be used in laboratories as a dye for biological preparations. At this point the bromothymol is already blue and uses a few drops of BTB on the waterslide. Mix the sample with the blue BTB solution and fix it on a glass slide with a coverslip. It is sometimes used to identify cell walls or nuclei under a microscope.
Bromothymol is used in obstetrics to detect premature rupture of the amnion. Since the pH of amniotic fluid is typically > 7.2, bromothymol turns blue when it comes in contact with amniotic fluid. The pH of the vagina is usually acidic, so blue indicates the presence of amniotic fluid. The test may be false positive in the presence of other alkaline substances such as blood or semen, or in the presence of bacterial vaginosis.
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The voltage produced by the colorimeter is __________ to the absorbance of the sample and ____________ to the light intensity.A) Directly proportional, indirectly proportionalB) Directly proportional, directly proportionalC) Indirectly proportional, indirectly proportionalD) Indirectly proportional, directly proportionalE) None of the above
E) None of the above is the correct answer. The voltage produced by the colorimeter is logarithmically related to the absorbance of the sample and proportional to the light intensity.
The study of measuring the concentration of a coloured substance in a solution is known as colorimetry. A colorimeter is a tool that is sensitive to light. It is used to gauge the amount of light that passes through a liquid sample both transmittance and absorption. During colour measurement, the fluctuation in electromagnetic radiation's intensity in the visible wavelength area of the spectrum as a result of transmission or reflection by an object or solution is counted. Such a test can help determine the concentration of chemicals since the amount and colour of light that is absorbed or transmitted relies on the properties of the solution, including the number of particles in it.
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1. how many molecules of phosphorus pentachloride are present in 8.70 grams of this compound ? molecules.
There are approximately 2.52 x 10^22 molecules of phosphorus pentachloride present in 8.70 grams of this compound.
As per the question given,
To determine the number of molecules of phosphorus pentachloride present in 8.70 grams of this compound, we need to use the following steps:
Determine the molar mass of PCl5, which is the sum of the atomic masses of one mole of P and five moles of Cl:
M(P) = 30.97 g/mol
M(Cl) = 35.45 g/mol
M(PCl5) = 30.97 + 5(35.45) = 208.23 g/mol
Convert the given mass of PCl5 to moles using its molar mass:
moles of PCl5 = 8.70 g / 208.23 g/mol = 0.0418 mol
Convert the number of moles of PCl5 to molecules using Avogadro's number, which is 6.022 x 10^23 molecules/mol:
molecules of PCl5 = 0.0418 mol x 6.022 x 10^23 molecules/mol = 2.52 x 10^22 molecules
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indentify the type of scientific knowledge represented by each statement law ,theory, hypothesis
1. All objects fall to the ground at the same rate regardless of their mass. Law: This is a statement of Newton’s law of gravity, which states that the force of gravity is equal for all objects regardless of their mass.
What is the gravity law of Newton?According to Newton's law of gravity, every particle in the cosmos is drawn to every other particle with a force that is inversely proportional to the square of the distance between them and directly proportional to the product of their masses. Sir Issac Newton created this law of gravity in 1687. According to this law, the gravitational force is always attracting and works along the line connecting the two particles. In the formula F=Gm1m2/r2, where G is the universal gravitational constant, m1 and m2 are the masses of the two interacting particles, and r is the distance between them, the gravitational force's magnitude is given.
This law has been used to explain the motion of the planets, moons, and other celestial bodies and is thought to be crucial to comprehending the motion of bodies in the universe.
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A chemical equation is a statement using chemical __ that express both the identities and the relative __ of the reactants and products involved in a chemical or physical change
Answer:
the answer is here
Explanation:
Question
In the diagram, which letter represent the transition from solid to liquid?
Responses
A. A
B. B
C. C
D. D
The letter represent the transition from solid to liquid E. E.
What is the transition ?Transition is a process of change from one state or condition to another. It is a fundamental element of life, as it allows us to move forward, adapt, and develop. Transition can be physical, emotional, spiritual, or even intellectual. It can involve a change in environment, relationships, beliefs, roles, or responsibilities. Transition can be gradual, or it can happen suddenly. It can be difficult and require a lot of effort, or it can be relatively easy. Transition can be a positive experience, or it can be a difficult experience. Regardless of the form it takes, transition is a necessary part of life and growth.
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a piece of charcoal is found to contain 30% of the carbon 14 that it originally had. when did the tree die from which the charcoal came? use 5600 years as the half-life of carbon 14
The time when the tree die from which the charcoal came is 1.02×10⁻⁴ years. if half-time of carbon-14 is 5600years.
An amount is dependent upon exponential decay on the off chance that it diminishes at a rate relative to its ongoing worth. Emblematically, this interaction can be communicated by the accompanying differential equation, where N is the amount and λ (lambda) is a positive rate called the dramatic rot steady, crumbling consistent, rate steady, or change consistent: dN/dt=-λN. The answer for this situation (see deduction beneath) is: N(t)=N₀e⁻[tex]\frac{k}{t}[/tex], where N(t) is the amount at time t, N₀ = N(0) is the underlying amount, that is to say, the amount at time t = 0.
We know that exponential decay is given
A[tex]_t[/tex] = A₀ e⁻[tex]\frac{k}{t}[/tex] where K is decay constant.
We firstly find decay constant by using the half life-time
We know that t=ln2/k where t is half life time .Since,t=5600years given
=>5600=ln2/k
=>k=(ln2/5600)years
Now,it is given that at any particular instant amount of charcoal remain is 30 % of initial amount.
So, (30/100)A₀=A₀e⁻[tex]\frac{k}{t}[/tex]
Here,k=(ln2/5600)years
=>30/100=e⁻ [tex]\frac{ln2/5600}{t}[/tex]
Taking ln on both sides of equation,we get
=>ln(30/100)=ln(e⁻ [tex]\frac{ln2/5600}{t}[/tex])
=>ln30-ln 100= - ln2/5600t
=>3.40 - 4.60 = -0.693/5600t
=> - 1.205 = -0.693/5600t
=>t=0.693/ (1.205×5600)
=>t=0.693 / 6748years
=>t=0.000102years or 1.02×10⁻⁴ years.
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what is the relationship between absorbance and concentration?
The concentration of a chemical influences absorbance. A substance's absorbance relates to its concentration. This is true because the quantity of light absorbed depends on the number of molecules with which light interacts.
The relationship between the absorbance and the concentration (c) of the sample solution employed in the experiment is straightforward. The width of the cuvette (l), which is equal to the length of the light path (l), has a direct relationship with absorbance. They are negatively correlated; as concentration rises, absorbance falls. Using Lambert's Beer Law, it is demonstrated that given a clear but colored solution, the relationship between absorbance and concentration is directly proportional. Increased particle density increases light absorption.
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which of the gases has the fastest‑moving molecules, on average, at a given temperature?
HBr
NO2
C2H6
They all have same average speed
C2H6 is the gas having the fastest‑moving molecules, on average, at a given temperature because of its lower molecular mass
With the chemical formula C 2H 6, ethane is an organic chemical substance. Ethane is a colourless and odourless gas at ordinary temperature and pressure. Ethane is separated from natural gas on an industrial scale, and it is produced as a by-product of the petrochemical process used to refine crude oil.
The mass of a certain molecule is its molecular mass, which is expressed in daltons. Because different isotopes of an element 30.07 g in 1 mole C2H6 are present in different molecules of the same chemical, their molecular weights might vary. As a result, we state that ethane has a molar mass of 30.07 g/mol (grammes per mole).
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sample contains 0.054 mg of mercury. how many significant figures are in the number? a) 0 b) 1 c) 2 d) 3
From the given information, the number of significant figures in the number 0.054 is 2 as the number contains only 2 figures.
Significant figures are the digits in a number that carry meaning or contribute to its accuracy. They include all the digits from 1 to 9 that are not leading or trailing zeros.
The number of significant figures in a calculation is determined by the least precise measurement involved in the calculation. In general, the result should be rounded to the same number of significant figures as the least precise measurement
The number 0.054 contains two significant figures (5 and 4). The leading zero is not significant because it serves only to locate the decimal point.
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which best describes the pka of a weak acid? choose one: a. pka values change over the course of a titration. b. the pka value depends on the concentration of the molecule present. c. the pka value depends on the ph. d. the pka is an intrinsic property of a molecule in question and depends on how tightly bound the acidic h is.
For a weak acid, the [tex]pk_a[/tex] value is an intrinsic property of the molecule and depends on how tightly bound the [tex][H^+][/tex] is.
In chemistry, an intrinsic property is a property of a substance that is independent of the amount of the substance present. Such properties are mainly dependent on chemical composition and structure.
The [tex]pk_a[/tex] value is the negative base 10 logarithm of the acid dissociation constant ([tex]k_a[/tex]) of a solution.
[tex]pk_a=-log_{10}(k_a)[/tex].
As the acid dissociation constant ([tex]k_a[/tex]) of a solution is an intrinsic property, hence the [tex]pk_a[/tex] value is also an intrinsic property.
The acid dissociation constant ([tex]k_a[/tex]) of a solution depends on the fact that if the acidic hydrogen [tex][H^+][/tex] is tightly bounded, then the value of [tex]k_a[/tex] will be decreased, which leads to the increase in the value of [tex]pk_a[/tex].
Hence, for a weak acid, the [tex]pk_a[/tex] value is an intrinsic property of the molecule and depends on how tightly bound the [tex][H^+][/tex] is.
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What is the purpose of using the refractometer in today's experiment?
To determine the solubility of D-limonene in liquid CO
To determine the refractive index of D-limonene and characterize the sample.
To determine the specific rotation of D-limonene.
To determine the chirality of D-limonene.
To determine the enantiomeric excess (% ee) of D-limonene.
The purpose of using the refractometer in today's experiment is to determine the refractive index of D-limonene and characterize the sample.
A refractometer is a laboratory instrument that measures the refractive index of a substance, which is a measure of how much the substance bends light. Refractometers are commonly used in various fields such as chemistry, physics, biology, and agriculture, to determine the composition, concentration, and purity of a sample.
In this experiment, the refractometer is being used to determine the refractive index of D-limonene, which is a clear liquid hydrocarbon that is commonly used as a solvent and flavoring agent. The refractive index of D-limonene can provide information about the purity and composition of the sample, and it can also be used to identify the substance.
The refractive index is determined by measuring the angle of refraction of a beam of light passing through the sample. The angle of refraction is then used to calculate the refractive index of the substance. The refractive index of a substance is dependent on its chemical composition and can be used to distinguish between different compounds.
the refractometer is an important instrument for characterizing the properties of a sample, and in this experiment, it is being used to determine the refractive index of D-limonene and provide information about the purity and composition of the sample.
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What can an element in activity series replace?
An element in activity series can replace the more reactive elements Because of this, the single replacement reaction occurs.
The activity series is defined as a list of elements in decreasing order of their reactivity. In a single replacement reaction, a given element is capable of replacing an element that is below it in the activity series. It can be used to predict if a reaction will occur. This reactions only occur when the element that is doing the replacing is more reactive than the element that is being replaced. It is useful to have a list of elements in order of their relative reactivities. The activity series defined as a list of elements in decreasing order of their reactivity. Since metals replace other metals while nonmetals replace other nonmetals and elements replace elements they each have a separate activity series.
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Which best describes Lenny’s error?
In Step 1, he should have found the square root of 400 J instead of squaring 8 m/s.
In Step 1, he should have multiplied 8 m/s by 2 instead of squaring it.
In Step 2, he should have divided 64 m2/s2 by 400 J instead of dividing 400 J by 64 m2/s2.
In Step 3, he should have multiplied 6.25 J per m2/s2 by 2 instead of dividing it by 2.
In Step 3, he should have multiplied 6.25 J per m2/s2 by 2 instead of dividing it by 2 best describes Lenny’s error. Therefore, option D is correct.
What is kinetic energy ?The term kinetic energy is defined as the energy that it possesses due to its motion. It is also defined as the work needed to accelerate a body of a given mass from rest to its stated velocity.
The object contain an kinetic energy,
Given Mass of an object = 400 J
Energy moving at a velocity = 8 m/s.
Ek = 1/2 mv²
= 400J = 1/2 × m 64
= 400J/ 64= 1/2 m
= 6.25 × 2
= 12.25kg
So, In the step 3 ,he should have multiplied 6.25 J per m²/s² by 2 instead of dividing it by 2.
Thus, option D is correct.
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Your question is incomplete, most probably your question was
Lenny wrote the steps he used to find the mass of an object with 400 J of energy moving at a velocity of 8 m/s.
1. Find the square of 8 m/s, which is 64 m2/s2.
2. Divide kinetic energy, 400 J, by 64 m2/s2, which is 6.25 J per m2/s2.
3. Divide 6.25 J per m2/s2 by 2 to get a mass of 3.125 kg.
Which best describes Lenny’s error?
A. In Step 1, he should have found the square root of 400 J instead of squaring 8 m/s.
B. In Step 1, he should have multiplied 8 m/s by 2 instead of squaring it.
C. In Step 2, he should have divided 64 m2/s2 by 400 J instead of dividing 400 J by 64 D. m2/s2.
In Step 3, he should have multiplied 6.25 J per m2/s2 by 2 instead of dividing it by 2.
which example involves a colligative property? responses pouring salt on an icy sidewalk to make it free of ice pouring salt on an icy sidewalk to make it free of ice transferring some of a concentrated solution into a dilute solution transferring some of a concentrated solution into a dilute solution bringing a carbonated beverage to room temperature bringing a carbonated beverage to room temperature heating a pure solvent to boiling
Pouring salt on an icy sidewalk to make it free of ice is an example of a colligative property. Colligative properties are properties of solutions that depend on the concentration of solute particles, but not on their identity.
Four common colligative properties are:
Freezing point depression: The freezing point of a solution is lower than the freezing point of the pure solvent.Boiling point elevation: The boiling point of a solution is higher than the boiling point of the pure solvent.Osmotic pressure: The pressure required to prevent osmosis, the flow of solvent from a region of low solute concentration to a region of high solute concentration, across a semipermeable membrane.Vapor pressure lowering: The vapor pressure of a solution is lower than the vapor pressure of the pure solvent.Pouring salt on an icy sidewalk to make it free of ice is an example of freezing point depression. The salt dissolves in the water on the surface of the ice and forms a solution. The presence of salt in the water lowers the freezing point of the water, causing it to melt even at temperatures below the normal freezing point of pure water. This effect is due to the increased number of solute particles in the solution, which interferes with the formation of the crystal lattice of ice.
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what is the oxidation state of an individual sulfur atom in so32− ?
The oxidation state of an individual sulfur atom in SO32- (sulfite ion) is +4.
The oxidation state of an element in a chemical species is a measure of the degree of oxidation (loss of electrons) or reduction (gain of electrons) of that element in the species. In general, the oxidation state of an element in a neutral compound is zero, while in an ion, it is equal to the charge on the ion.
In the sulfite ion, SO32-, the sulfur atom has an oxidation state of +4. This means that it has lost four electrons compared to its neutral state.
The three oxygen atoms in the ion have an oxidation state of -2 each, so their total contribution to the charge on the ion is -6. To balance this, the sulfur atom must have a charge of +6, which is achieved by assigning an oxidation state of +4 to the sulfur atom.
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a solution is to be prepared in a laboratory. the solution requires 0.0465 mol of quinine (c20h24n2o2). what mass, in grams, should the laboratory technician obtain in order to make the solution?
The laboratory technician should obtain 15.06 grams of quinine to prepare a solution that requires 0.0465 mol of quinine.
To determine the mass of quinine (C₂0H₂4N₂O₂) needed to prepare a solution with 0.0465 mol of quinine, we need to use its molar mass:
Molar mass of quinine = (20 x 12.01 g/mol) + (24 x 1.01 g/mol) + (2 x 14.01 g/mol) + (2 x 16.00 g/mol) = 324.43 g/mol
We can then use the following formula to calculate the mass of quinine needed:
Mass of quinine = number of moles of quinine × molar mass of quinine
Mass of quinine = 0.0465 mol × 324.43 g/mol
Mass of quinine = 15.06 g
Therefore, the laboratory technician should obtain 15.06 grams of quinine to prepare a solution that requires 0.0465 mol of quinine.
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how do mafic and felsic minerals and rocks differ from each other?
Mafic and felsic minerals and rocks are both types of igneous rocks, which form when magma or molten rock cools and crystallizes.
Mafic minerals and rocks are composed of dark-colored minerals, such as olivine, pyroxene, amphibole, and biotite. These minerals tend to be high in magnesium and iron, and are relatively low in silica. As a result, mafic rocks are denser and heavier than felsic rocks.
Felsic minerals and rocks, on the other hand, are composed of light-colored silicate minerals, such as quartz, feldspar, and muscovite. These minerals are high in silica and low in magnesium and iron. As a result, felsic rocks are less dense and lighter than mafic rocks. Felsic rocks often form in more explosive volcanic eruptions, while mafic rocks form in quieter eruptions. Finally, felsic rocks tend to have a light-colored or white appearance, while mafic rocks are typically dark gray or black.
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a saline solution was made by dissolving 1.69 g sodium chloride in 200 ml distilled water. what is the concentrtation of salt in this soution
a saline solution was made by dissolving 1.69 g sodium chloride in 200 ml distilled water,then the concentration of salt in the solution is 8.45 g/L.
To find the concentration of salt in the solution, we need to divide the amount of salt (in grams) by the volume of the solution (in liters).
First, we need to convert the volume from milliliters (mL) to liters (L):
200 mL = 0.2 L
Next, we can calculate the concentration of salt:
concentration = amount of salt / volume of solution
concentration = 1.69 g / 0.2 L
concentration = 8.45 g/L
Therefore, the concentration of salt in the solution is 8.45 g/L.
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What are the components in cassiterite
Answer:
Minerals and rocks
Cassiterite is a tin oxide mineral (SnO2) and the principal source for tin metal (79.6% Sn). The color is shining black, brownish-black (Fig. 1.34), reddish brown, gray, red, white, and rarely colorless. The crystal system is tetragonal with very common twinning.
a chef plans to mix vinegar with italian dressing. the italian dressing contains vinegar. the chef wants to make milliliters of a mixture that contains vinegar. how much vinegar and how much italian dressing should she use?
chef should use 478.04 ml of Italian dressing and 21.96 ml of vinegar to make 500 ml of a mixture that contains 2% vinegar
To solve this , we need to use the concept of the concentration of the solution.
Let's assume that the concentration of vinegar in the Italian dressing is C1 and that the chef wants to make V milliliters of a mixture that contains vinegar.
Let's also assume that the concentration of vinegar in the final mixture is C2.
To find out how much vinegar and Italian dressing the chef should use, we can use the following formula:
C1V1 + C2V2 = C2V
where V1 is the volume of the Italian dressing that the chef should use, and V2 is the volume of vinegar that the chef should use.
We know that the concentration of vinegar in the Italian dressing is C1, so the concentration of the other ingredients in the Italian dressing is 1 - C1.
Let's assume that the chef wants to use x milliliters of Italian dressing and y milliliters of vinegar.Using the formula above, we can set up the following equation:
C1 * x + 1 * y = C2 * V
x + y = V
We have two equations and two unknowns, so we can solve for x and y.
y = (C2 - C1) * V / (1 - C1)
x = V - y
Substituting the values of C1, C2, and V, we get:
y = (0.05 - 0.02) * 500 / (1 - 0.02) = 21.96 ml
x = 500 - 21.96 = 478.04 ml
Therefore, the chef should use 478.04 ml of Italian dressing and 21.96 ml of vinegar to make 500 ml of a mixture that contains 2% vinegar.
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when 40 milliliter of 1 molar sodium iodide is added to 40 milliliters of .5 molar aluminum iodide the number of moles of pb^2 that must be added to precipitate out all of the iodide would be
30 milliliters of 2 molar lead (II) nitrate must be added to the solution to precipitate out all of the iodide.
To determine the number of moles of Pb^2+ that must be added to precipitate out all of the iodide, we first need to understand the chemical reaction that takes place when sodium iodide and aluminum iodide are mixed. Sodium iodide (NaI) and aluminum iodide (AlI3) react to form sodium aluminum iodide (NaAlI4) and sodium iodide (NaI): 2 NaI + AlI3 → 3 NaAlI4 In this reaction, the sodium iodide and aluminum iodide are converted into sodium aluminum iodide. The number of moles of each reactant can be calculated using the following formula:
moles = concentration x volume
For the 1 molar sodium iodide, the number of moles present in 40 milliliters can be calculated as:
moles of NaI = 1 mol/L x 0.04 L = 0.04 moles
For the 0.5 molar aluminum iodide, the number of moles present in 40 milliliters can be calculated as: moles of AlI3 = 0.5 mol/L x 0.04 L = 0.02 moles Since the reaction between NaI and AlI3 produces a 2:1 ratio of NaI to AlI3, we can see that all of the AlI3 will be consumed before all of the NaI is consumed. This means that we need to determine the amount of excess iodide (I-) in the solution after all of the AlI3 has reacted. First, we calculate the total moles of iodide (I-) present in the solution :moles of I- = 2 x moles of NaI + 3 x moles of AlI3
moles of I- = 2 x 0.04 + 3 x 0.02
moles of I- = 0.12 moles Now we need to calculate the amount of Pb^2+ required to react with all of the iodide (I-) in the solution. The balanced chemical equation for the reaction of lead (II) nitrate (Pb(NO3)2) with iodide (I-) is: Pb(NO3)2 + 2 NaI → PbI2 + 2 NaNO3 In this reaction, one mole of lead (II) nitrate reacts with two moles of iodide (I-) to form one mole of lead iodide (PbI2). Since the moles of iodide (I-) in the solution are equal to 0.12 moles, we need 0.06 moles of lead (II) nitrate to completely precipitate out all of the iodide. The number of moles of lead (II) nitrate required can be calculated using the following formula:
moles = concentration x volume Assuming that lead (II) nitrate is added in excess and that the final volume of the solution is 80 milliliters, we can calculate the concentration and volume of lead (II) nitrate required as follows: moles of Pb(NO3)2 = 0.06 moles
volume of Pb(NO3)2 = moles / concentration
volume of Pb(NO3)2 = 0.06 moles / (2 mol/L)
volume of Pb(NO3)2 = 0.03 L = 30 mL
Therefore, 30 milliliters of 2 molar lead (II) nitrate must be added to the solution to precipitate out all of the iodide.
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What is the chemical formula for water?
Answer:
H2O
Explanation:
Answer:
H2O
Explanation:
The chemical formula for water is H2O, meaning it is made up of 2 hydrogen atoms and 1 oxygen atom.
Does extracellular fluid include interstitial fluid?
Yes, interstitial fluid is included in the extracellular fluid.
Extracellular fluid refers to all the fluid that is outside of cells and includes both interstitial fluid and plasma. Interstitial fluid is the fluid that surrounds individual cells and fills the spaces between tissues. Plasma, on the other hand, is the fluid component of the blood that carries nutrients, hormones, waste products, and other substances throughout the body.
Together, interstitial fluid and plasma make up the extracellular fluid compartment, which is important for maintaining fluid balance and supporting the exchange of substances between cells and their environment. The extracellular fluid compartment is constantly in flux, with fluid moving in and out of it as needed to maintain homeostasis.
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