Answer:
E. All of the above
A piece of stone which weight 50g was placed in a measuring cylinder containing water, The level of the water rose from 30cm³ to 35cm³.calculate the density.
Answer: 10
Explanation:
The volume of the stone is:
New Water level - Orginal Water level = Volume
35 - 30=5
The mass of the stone is 50
Density=mass/volume
X= 50/5
The density of the Stone = 10g/cm
What phyical and chemical propertie would be important in the tin that plate the outide of the can
Tin is not easily oxidized and resists corrosion because it is protected by an oxide film. Tin resists corrosion from distilled sea and soft tap water, and can be attacked by strong acids, alkalis and acid salts. Tin is used in for can coating: tin-plated steel containers are widely used for food preservation.
What happens when tin reacts with acid?
Characteristics: Metallic tin is soft and malleable. It slowly dissolves in dilute nonoxidizing acids or more readily in hot concentrated HCl. It reacts with HNO3 to form metastannic acid, H2SnO3, a white substance insoluble in alkalies or acids.
Tin can it oxidize things?
A reducing agent is TIN(II) OXIDE. due to slow oxidation to tin(IV) oxide, unstable in air. This oxidation starts to burn incandescently at 300 °C. powerful oxidizing agents incompatible.
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Atmopheric air ha a temperature of 85 f and dew point of 53f what i relative humidity when cooled to 60f ? how many pound of water are removed from 20000 cu ft if cooled to 35F?
The relative humidity when air is 85F will be 33.38%. The relative humidity when it cooled to 60F is 77.65%.
Why is relative humidity named that?The quick response is in relation to the maximum volume of water vapour that may be held inside this air at a specific temperature. A value of 50% relative humidity, for instance, indicates that there is only 50% as much water vapor present as there would be if the air is saturated at a certain temperature.
What is the formula for relative humidity?The formula for relative humidity (%) is relative humidity (actual vapor pressure/saturated vapor pressure) = actual vapor pressure/saturated vapor pressure x 100. Relative humidity is represented by the resultant value.
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what is the trend in the size of the band gap as you move down the column of the group 4a elements?
The trend in the size of the band gap as you move down the column of the group 4a elements is the band gap decreases
Column elements of group 4A are the 14th group chemical elements in the periodic table. Members of group IVA are carbon (C), silicon (Si), germanium (Ge), tin (Sn), lead (Pb), and flerovium (Fl). Group 4A contains elements of all three types: nonmetals, metalloids/semimetals, and metals.
The energy gap or band gap is the difference between the upper end of the valence band (Ev) and the lower end of the conduction band (Ec) or the minimum energy required to excite electrons from the valence band to the conduction band. The band gap size trend will decrease as the group 4A column elements move down. This is because the band gap energy decreases as it approaches the nano gap, so that the energy level decreases and the band thickness becomes thinner.
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what is the maximum mass of ammonia that can be produced by the reaction of 1,000g of nitrogen with 500g of hydrogen?
2815.9 g is the maximum mass of ammonia that can be produced by the reaction of 1,000g of nitrogen with 500g of hydrogen
Write the balanced equation.
3H₂ + N₂ → 2NH₃
Calculate the moles of hydrogen in 500g.
n = m/M; where n = moles, m = mass, and M = molar mass.
M(H₂) = 2 × 1.008 g/mol H = 2.016 g/mol H₂
n(H₂) = (500)/(2.016 g/mol) = 248.015 mol H₂
Calculate the moles of nitrogen in 1,000g
M(N₂) = 2 × 14.007 g/mol N = 28.014 g/mol N₂
n(N₂) = (1,000g )/(28.014 g/mol) = 35.696 mol N₂
Calculate the moles of ammonia that can be produced by 248.015 mol H₂ and 35.696 mol N₂, using the mole ratio between each reactant and ammonia in the balanced equation.
248.015 mol H₂ × 2 mol NH₃/3 mol H₂ = 165.34 mol NH₃
35.696 mol N₂ × 2 mol NH₃/1 mol N₂ = 71.392mol NH₃
Because H₂ produces the least number of moles of NH₃, it determines the maximum mass of NH₃.
Calculate the mass of NH₃ in 3.3069 mol.
m = n × M
M(NH₃) = 14.007 g/mol N + (3 × 1.008 g/mol H) = 17.031 g/mol NH₃
m(NH₃) = 165.34 mol × 17.031 g/mol = 2815.9 g NH₃
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at the end of glycolysis, in what molecule(s) can one not find the energy that was contained in the chemical bonds of glucose? select all that apply.
Two molecules of ATP, two molecules of NADH, and two molecules of pyruvate are net products of glycolysis. Pyruvate is where the majority of the energy is kept. It will travel through the Krebs cycle to continue to oxidize.
Which of the following does not result from glycolysis to produce ATP?
Carbon dioxide is the appropriate response to this query. Glycolysis does not result in the production of carbon dioxide.
What results from glycolysis in the absence of oxygen?
Two molecules of pyruvate, adenosine triphosphate (ATP), nicotinamide adenine dinucleotide (NADH), and water are the products of glycolysis. Both aerobic and anaerobic species engage in glycolysis. Pyruvate is fermented into lactic acid, ethanol, and CO2 when oxygen is not present
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fructose (common sugar found in fruit): c 40.00%, h 6.72%, o 53.28%
C4H5N2O is the empirical formula.
The number of moles of carbon is calculated by
mass/molar mass
=> 40/12
=> 3.33 mol
number of Hydrogen Molecules
=> 6.72/1
=> 6.72 Molecules
the amount of oxygen in moles is
53.28/16
=> 3.33 mol.
Divide each mol by the least number of moles to get the molar ratio of C:H:O: 3.33/3.33 C: 6.72/3.33 H: 3.33/3.33O
=> 1 C : 2 H : 1 O
Experimental equation = CH2O
the number of moles of carbo is
=> 49.48/12
=> 4.12
Hydrogen has a molecular weight of
=> 5.19/1
=> 5.19.
the amount of nitrogen in moles is equal to
=> 28.85/14
=>2.06
the number of oxygen moles is 16.48/16, or 1.03
Molar ratio: 4.12/1.03 C: 5.19/1.03 H: 2.06/1.03 N: 1.03/1.03 O= >4C: 5H: 2N: 1O
Empirical equation equals C4H5N2O
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An ion always contains
O equal numbers of protons and neutrons
O equal numbers of protons and electrons
O unequal numbers of protons and electrons
O unequal numbers of protons and neutrons
An ion always contains unequal numbers of protons and electrons. Therefore, option C is correct.
What is an ion?An ion can be defined as a chemical species that holds a positive or negative charge. The ‘ion’ can be referred to as atoms or molecules with non-zero charges associated with them.
Therefore, all ions have either more electrons than protons in their atomic structure more protons than electrons.
If the protons are greater than electrons are termed to exhibit a net positive charge and are usually referred to as cations. The ions that contain more electrons than protons exhibited a net negative charge and are referred to as anions.
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solid iron(ii) oxide reacts with carbon monoxide gas to form solid iron and carbon dioxide gas.
The balanced chemical equation will be [tex]$$\mathrm{Fe}_2 \mathrm{O}_3(\mathrm{~s})+3 \mathrm{CO}_{(\mathrm{g})} \rightarrow 2 \mathrm{Fe}_{(\mathrm{s})}+3 \mathrm{CO}_2(\mathrm{~g})$$[/tex]
Chemical equations are symbols and chemical formulae that depict a chemical reaction symbolically.
Reactants, products, and an arrow indicating the reaction's direction make up a chemical equation. A balanced chemical equation is one in which the number of atoms in each of the molecules is the same on both sides of the equation.
Solid iron (iii) Oxide reacts with carbon monoxide gas to form solid iron and carbon dioxide gas.
Iron (iii) oxide --> [tex]Fe_2O_3[/tex]
Carbon monoxide --> CO
Iron --> Fe
Carbon dioxide --> [tex]CO_2[/tex]
The given statement is
[tex]$$\mathrm{Fe}_2 \mathrm{O}_3(\mathrm{~s})+\mathrm{CO}_{(\mathrm{g})} \longrightarrow \mathrm{CO}_2+\mathrm{Fe}_{(\mathrm{g})}$$[/tex]
Here, on LHS & on RHS we have the following:
Fe --> 2 --> 1
C --> 1 --> 1
0 --> 4 --> 2
The reaction is unbalanced; so, we will balance the chemical equation
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The complete question should be:
Solid iron(III) oxide reacts with carbon monoxide gas to form solid iron and carbon dioxide gas. Express your answer as a chemical equation.
how dose physical work
Physical changes only change the state of substance not it's chemical composition.
What are physical changes?
Physical changes are defined as changes which affect only the form of a substance but not it's chemical composition. They are used to separate mixtures in to chemical components but cannot be used to separate compounds to simpler compounds.
Physical changes are always reversible using physical means and involve a change in the physical properties.Examples of physical changes include melting,boiling , change in texture, size,color,volume and density.
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Your question is incomplete , but most probably your full question was,how does physical changes work?
a stock solution of nh4i is available to prepare solutions that are more dilute. calculate the volume, in ml, of a 2.0-m solution of nh4i required to prepare exactly 250 ml of a 0.180-m solution of nh4i.
A 2.0-m solution of nh4i required to prepare exactly 250 ml of a 0.180-m solution of nh4i, the needed volume is 22.5 ml
M1V1=M2V2
V1=M2V2/M1
V1= 0.180×250 ÷2.0
V1=22.5 ml
The area occupied within an object's boundaries determines its volume in three dimensions. On occasion, it is referred to as the object's capacity. The volume of an object can be used to calculate how much is needed to fill it; for instance, how much water is needed to fill a bottle, aquarium, or water tank. A sphere is the most basic and prevalent type of three-dimensional shape. We come across spheres all the time in the form of balls, globes, ornamental lights, oranges, etc.
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The number of miles mario can drive varies directly with the amount of gas that he has. he can drive 18 miles on ½ a gallon of gas. how many miles can mario drive with 9 gallons of gas?
Mario can drive 324 miles with 9 gallons of gas.
To find the number of miles Mario can drive with 9 gallons of gas, you can use the formula for direct variation: y = kx, where y is the number of miles Mario can drive, x is the number of gallons of gas, and k is the constant of variation.
A sort of proportionality known as "direct variation" occurs when one quantity directly changes in response to a change in another quantity. This suggests that if one quantity increases, the other quantity will also increase proportionately. Similar to the last example, if one quantity declines, the other amount also declines.
Since we know that Mario can drive 18 miles on ½ a gallon of gas, we can set up the equation like this: 18 = k * 0.5. Solving for k, we find that k = 36.
Then we can substitute 9 for x in the equation to find the number of miles Mario can drive with 9 gallons of gas: y = 36 * 9 = 324 miles.
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Mario can drive 324 miles with 9 gallons of gas.
To find the number of miles Mario can drive with 9 gallons of gas, you can use the formula for direct variation: y = kx, where y is the number of miles Mario can drive, x is the number of gallons of gas, and k is the constant of variation.
A sort of proportionality known as "direct variation" occurs when one quantity directly changes in response to a change in another quantity. This suggests that if one quantity increases, the other quantity will also increase proportionately. Similar to the last example, if one quantity declines, the other amount also declines.
Since we know that Mario can drive 18 miles on ½ a gallon of gas, we can set up the equation like this: 18 = k * 0.5. Solving for k, we find that k = 36.
Then we can substitute 9 for x in the equation to find the number of miles Mario can drive with 9 gallons of gas: y = 36 * 9 = 324 miles.
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When sulfuric acid is combined with sugar, gas is released and a tall black column forms. This is an example of a..?a. physical propertyb. chemical propertyc. physical changed. chemical change
This is an example of a chemical change.
When sulfuric acid is combined with sugar, a chemical reaction occurs that produces gas and a black column. The gas and black column are new substances that were not present before the reaction took place. This indicates that a chemical change has occurred, as the substances have been transformed into something new with different properties.
Physical changes, on the other hand, involve a change in the form or appearance of a substance, but the substance itself remains unchanged. For example, crushing a rock into smaller pieces is a physical change, because the rock is still made up of the same substance, just in a different form.
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the reaction of ch3ch2mgbr with ch3coch2ch3 gives: group of answer choices the racemate of a chiral product. none of the above a single enantiomer. a mixture of diastereomers. an achiral product.
The reaction of CH₃CH₂MgBr with CH₃COCH₂CH₃ gives the product , the right answer of choice is : an achiral product.
An achiral product is the identical with its mirror image. the achiral compound is superimposable on its mirror image. an achiral product is the product which is as same as its mirror image . the achiral compound is superimposable. while the chiral object is not identical with its mirror image. the chiral compound is not superimposable it its mirror image.
Thus, an achiral product is formed by the reaction of the CH₃CH₂MgBr with CH₃COCH₂CH₃ which is superimposable to its mirror image.
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calculate the energy released in units of megaelectron volts when a uranium-238 nucleus undergoes alpha decay.
The energy generated by the alpha decay of a uranium-238 nucleus is 4.25 megaelectron volts (MeV).
A nuclear process known as "alpha decay" releases a particle made up of two protons and two neutrons when an unstable nucleus transforms into another element. An alpha particle, which is just a helium nucleus, is an expelled particle that has this name. A positive charge and a sizable mass characterize alpha particles.
We have, when [tex]U^{238}[/tex] emits an alpha particle,
[tex]U^{238}= Th^{234}+He^{4}[/tex]
Therefore, mass defect, Δm = [tex]m*U^{238} - (m*Th^{234} +m He^4)[/tex]
⇒Δm=[tex][238.0508-(234.0436+4.0026)][/tex]
⇒Δm= [tex]0.00457u[/tex]
So energy released, [tex]E=[/tex]Δ[tex]mc^2[/tex]
⇒[tex]E= 0.00457u*931.5MeV\\[/tex]
⇒[tex]E= 4.25 MeV[/tex]
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Why might Pacific Ocean be more conducive to volcanic activity?
Answer:
One reason is that the Pacific Ocean is home to the "Ring of Fire," a region that is prone to earthquakes and volcanic eruptions. The Ring of Fire is a horseshoe-shaped area around the Pacific Ocean that is characterized by a high number of earthquakes and volcanic eruptions. It is caused by the movement of tectonic plates, which are large pieces of the Earth's crust that move slowly over time.
how many atoms of carbon are present in 25.0g of glucose, c6h12o6? (molar mass of glucose is 180.2 g/mol)
The chemical formula of Glucose is C6H12O6. Glucose is a monosaccharide containing an aldehyde group (-CHO) the no. of carbon atoms =3.6132 × 10^21 .
It is made of 6 carbon atoms, 12 hydrogen atoms and 6 oxygen atoms. Glucose is an aldohexosecarbohydrates can be classified into three types: monosaccharides, oligosaccharides, and polysaccharides.
The sugar chemical formula is C12 H22 O11 , the fructose formula is C6H12O6 and the chemical formula of glucose is C6H12O6.
Glucose if C6H12O6 molecular weight is (×6)+ 46+ 96 = M4 44 4 4 4 g =180 = moles of molecule 4,
now #1 in 4 molecules 444 = 6.022 × 10^23 or no.
Molecules in 0.01 mole of glucose = 6.022 × 10^21
Now, one molecule of glucose has 6 carbons. So carbons 6.022 × 10^21 = 4 molecules × 42 glucose × 10^21 × 6 = 3.6132 × 10^21 carbon atoms.
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Which of the following combination will form an electrovalent bond?
a.p and cl
b.nh3 and bf3
c.h and ca
d.h and s
The right response is option A. cl and p. P and Cl can form an electrovalent bond just as elements with significant electronegativity differences can.
When electrons are moved from the atoms of one element to the atoms of another, creating positive and negative ions, electrovalent bonds are created. The term "electrovalent bond" or "ionic bond" refers to the bond created when two atoms share electrons.
Ionic bonds, also known as electrovalent bonds, are a type of linkage created in a chemical molecule by the electrostatic attraction of ions with opposing charges.
When one or more electrons from a metal atom are transferred to one or more electrons from a nonmetal atom, electrovalent bonds are created. MgCl2, CaCl2, MgO, Na2S, and numerous more chemicals are other examples.
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(05.04 hc) the temperature of a chemical reaction ranges between 40 degrees celsius and 180 degrees celsius. the temperature is at its lowest point when t = 0, and the reaction completes 1 cycle during a 12-hour period. what is a cosine function that models this reaction? (6 points) a f(t) = 70 cos 12t 110 b f(t) = 110 cos 12t 70 c f(t) = −70 cos pi over 6 t 110 d f(t) = −110 cos pi over 6 t 70
The cosine function of a chemical reaction that occurs at temperatures between 40 and 180 degrees Celsius is [tex]f (t) = -70\cos \left(\frac{\pi}{6}\right)t+110[/tex]. Option c is the correct expression.
A cosine function's amplitude is equal to half the vertical distance between its highest and lowest points. The distance between the tallest point and the center line is equal to this. This is of the form f (t) = A cos (bt)+k where A is the wave amplitude, t is the time period, and k is the vertical displacement.
In this problem, the temperature is measured by f(t), which ranges from 40 to 180 degrees Celsius. Then the temperature is not negative. The amplitude will be,
[tex]A=\frac{|180-40|}{2}=70[/tex]
Given the time period is 12 hours.
[tex]\begin{aligned}\text{Period}&= \frac{2\pi}{b}\\12&= \frac{2\pi}{b}\\b&= \frac{2\pi}{12}\\b&=\frac{\pi}{6}\end{aligned}[/tex]
When, t = 0, the wave must be at its lowest point. Then, f(t)=40. Find k using this.
[tex]\begin{aligned}f(t=0)&=40\\40&=-70\cos\left(\frac{\pi}{6}\times 0\right)+k\\40&=-70+k\\k&=110\end{aligned}[/tex]
The required cosine function will be of the form, [tex]f (t) = -70\cos \left(\frac{\pi}{6}\right)t+110[/tex]
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a hazardous waste incinerator is being fed methylene chloride at a concentration of 5,858 mg/l in an aqueous stream at a rate of 40.5 l/min. calculate the mass flow rate of the feed in units of g/min.
Methylene chloride is being fed into a hazardous waste incinerator at a rate of 40.5 l/min in an aqueous stream with a concentration of 5,858 mg/l. The feed's mass flow rate is 237.25g/min
The mass of a liquid traveling through a pipe in a given amount of time is its mass flow rate. In other words, the rate at which fluid passes through a unit area is termed as the rate of mass flow. The density, liquid velocity, and cross-sectional area all have an impact on the mass flow.
Given that methylene chloride has a concentration of 5,858 mg/l
Methylene chloride rate = 40.5 L/min
The mass flow rate is equal to 40.5 x 5858 x 10-3.
g/min rate = 237.25
Consequently, the mass flow rate found is = 237.25g/min
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how many grams of carbon atoms are present in a sample of c5h7 if there are 4.10 moles of hydrogen atoms in the sample
29.52 grams of carbon atoms are present in a sample of c5h7 if there are 4.10 moles of hydrogen atoms in the sample
the ratio of C: H C5H7 in is 0.60:1
If 4.10 moles H is present in C5H7
Therefore amount of C present is 2.46 mol
Amount of Carbon present =2.46*12.
=29.52g
Carbon (from Latin carbo 'coal') is a chemical element with the symbol C and atomic number 6. It is nonmetallic and tetravalent—its atom making four electrons available to form covalent chemical bonds. It belongs to group 14 of the periodic table. Carbon makes up only about 0.025 percent of Earth's crust.
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silver oxalate, ag2c2o4), is dissolved in pure water. the concentration of ag ions is a saturated solution is 2.2 x 10-4 m. what is the ksp of ag2c2o4)?
Ag ions have a 2.2 x 10-4 m concentration in a saturated solution, while the ksp of ag2c2o4 is 5.3 x 10-12.
[Ag^+] = 2.2 × 10^-4 mol L^-1 [C2O4^2 - ] = 0.5 [Ag^+]
What in chemistry is concentration?The amount of solute in a certain amount of solution is how concentrated a material is. Molarity, or the number of moles of solute in one liter of solution, is the standard unit of concentration expression.
Give me an example of focus.How much of the solute has been dissolved in the solvent is indicated by the concentration of the solution. A concentration of one teaspoon of salt per two cups of water, for instance, might be indicated as 1 t salt per 2 c water.
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How many atoms of silicon would there be in a sample that contained 4.66 x 1030 grams?
The number of atoms of silicon present in a sample that contained 4.66 × 10³⁰ grams is 9.99 × 10⁵² atoms.
How to calculate number of atoms?The number of atoms of a substance can be calculated by multiplying the number of moles in the substance by Avogadro's number as follows:
no of atoms = no of moles × 6.02 × 10²³
However, the number of moles in 4.66 × 10³⁰ grams must be calculated as follows:
moles = 4.66 × 10³⁰ grams ÷ 28.0855g/mol
moles = 1.659 × 10²⁹ moles
Number of atoms = 1.659 × 10²⁹ moles × 6.02 × 10²³
no of atoms = 9.99 × 10⁵² atoms
Therefore, 9.99 × 10⁵² atoms is the number of atoms of silicon in the sample.
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how many moles of asa are present in a 5 ml aliquot (measured sample) of this solution?
The United States Pharmacopeia (USP) establishes standards for pharmaceuticals moles (6). The quantity of CgH8O4 in aspirin tabs must be between 95 and 105 percent of what is stated on the label (acetylsalicylic acid).
For CgH9NO2, the same percentage is true (acetaminophen). Use the calculation below to determine how much aspirin is in each pill. (MW = 180 g/mole for aspirin) Mass of aspirin Equals moles of aspirin times its molecular weight (in g/mole) (in grams) 7. Titration with a powerful base can be used to determine the concentration of an acid solution. To start, figure out how many moles of strong base are needed to achieve the titration's equivalence point.
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g 1 mole of a monoatomic gas increases its volume from 1 to 3 while the pressure also increases from 250 to 1000. this p-v process is linear. find the involved work of this process
The involved work done when gas increases its volume from 1 to 3 while the pressure also increases from 250 to 1000 is 2250 joule
Work done= ΔpΔv
Work done=3×750
Work done=2250 joule
First Law of Thermodynamics: The change in total internal energy of a particular system between two states is described by the first law of thermodynamics. The first law of thermodynamics states that when heat is added to a system or when work is done, the total internal energy of the system will change. A positive result when calculating work done indicates that energy is discharged into the environment while the system is operating. If the value is negative, the environment's influence has caused the system to gain energy.
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Calculate the mass of copper that would be present in 250.0 ml of solution that has a 0.0375 M of Cu2+ ions.
The mass of copper present in the 250 mL solution that has a 0.0375 M of Cu²⁺ ions is 0.57 g
How do I determine the mass of copper?We'll begin by obtaining the number of mole of copper, Cu²⁺ ions. Details below:
Volume of solution = 250 mL = 250 / 1000 = 0.25 LMolarity of Cu²⁺ ions = 0.0375 MNumber of mole =?Molarity = Number of mole / volume
Cross multiply
Number of mole = molarity × volume
Number of mole = 0.0375 × 0.25
Number of mole = 0.009 mole
Finally, we shall determine the mass of copper. This can be obtained as follow:
Cu²⁺ + 2e —> Cu
From the balanced equation above,
1 mole of Cu²⁺ is equivalent to 1 mole of Cu.
Therefore,
0.009 mole of Cu²⁺ will also be equivalent to 0.009 mole of Cu.
Mole of copper = 0.009 mole Molar mass of copper = 63.5 g/molMass of copper =?Mole = mass / molar mass
Cross multiply
Mass = Mole × molar mass
Mass of copper = 0.009 × 63.55
Mass of copper = 0.57 g
Thus, the mass of copper is 0.57 g
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Balance the following chemical equation (I suggest using the algebraic method, otherwise good luck) include the steps you took to get there.
KOH + KNO3 + Cr2O3 -> H2O + K2CrO4 + KNO2
Explanation:
To balance the chemical equation, we need to ensure that the number of atoms of each element is the same on both sides of the equation. Here's how to balance the equation using the algebraic method:
Write the unbalanced equation:
KOH + KNO3 + Cr2O3 -> H2O + K2CrO4 + KNO2
Identify the elements that are not balanced: K, O, Cr, N
Assign a variable to each element that is not balanced. For example, we can assign x to the coefficient for KOH, y to the coefficient for KNO3, and z to the coefficient for Cr2O3:
KOH + KNO3 + Cr2O3 -> H2O + K2CrO4 + KNO2
x y z
Write an equation for each element, using the variables and the coefficients in the unbalanced equation.
For example, for K we have:
x + y + 2z = 2
For O, we have:
x + 3y + 2z = 2
For Cr, we have:
z = 1
For N, we have:
y + z = 1
Solve the system of equations to find the values of x, y, and z. We can use any method to solve the system of equations, such as substitution or elimination. Here's one way to solve the system using substitution:
From the equation for N, we can solve for y: y = 1 - z
Substituting this expression for y in the equation for O, we get:
x + 3(1 - z) + 2z = 2
Simplifying the equation gives us:
x + z = 1
From the equation for Cr, we know that z = 1. Substituting this value in the equation for K, we get:
x + 1 + 2(1) = 2
Solving for x gives us:
x = 0
Substituting the values for x, y, and z back into the unbalanced equation gives us the balanced equation:
0KOH + 1KNO3 + 1Cr2O3 -> 2H2O + 2K2CrO4 + 1KNO2
A solution cotains 50 g of NaCl per 100.0 g of water at 25 C. is the solution unsaturated, saturated, or supersaturated? (use the figure 12.11 in the textbook.)
The solution is Supersaturated.
Solubility is defined as the maximum amount of a substance that will dissolve in a given amount of solvent at a specified temperature.
Solubility of NaCl at 25°C = 35.9 g/100 ml
So, a saturated solution has 35.9 g NaCl in 100 ml solution.
Given solution has 50 g of NaCl in 100 g of water. (At Standard Temperature and Pressure, 100 ml water is equivalent of 100g.)
Therefore, in give case the concentration of NaCl- Water solution is 50 g/100 ml.
It is more than concentration of saturated solution. Hence, the given solution is Supersaturated.
A supersaturated solution is a solution which contains more than the average solvent that can be dissolved at a given temperature.
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a reagent test strip pad impregnated with stabilized, diazotized 2,4-dichloroaniline will yield a positive reaction with a. bilirubin b. hemoglobin c. ketones d. urobilinogen
A reagent strip area impregnated with stabilized, diazotized 2,4-dichloroaniline will yield a positive reaction with Bilirubin.
Bilirubin is a purple-orange compound that takes area within the everyday catabolic pathway that breaks down heme in vertebrates. This catabolism is a critical system in the body's clearance of waste merchandise that rise up from the destruction of aged or wonderful purple blood cells.
A bilirubin take a look at measures the level of bilirubin inside the blood. Bilirubin (bil-ih-ROO-bin) is a yellowish pigment produced while purple blood cells are damaged down. Bilirubin passes thru the liver and is finally excreted from the frame.
Better than normal bilirubin ranges can imply numerous styles of liver or bile duct problems. In a few instances, an elevated rate of crimson blood mobile destruction is the motive of excessive bilirubin ranges.
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The following are characteristics of ideal chemical sanitizer except:
A. Approved for food contact surface application C. High in toxicity and corrosivity
B. Destroys microorganisms rapidly
D. Leaves no residues
The following are characteristics of ideal chemical sanitizer except: Option A. Approved for food contact surface application and option C. High in toxicity and corrosivity
Chemical substances that are capable of eradicating disease-causing microorganisms are also used to sanitize. Chlorine (bleach), iodine, and quaternary ammonium are common sanitizers. Chemical disinfectants are widely used in the food service sector.
The most often used sanitizers are those that contain chlorine. They work well against all bacteria and are reasonably priced. The ideal temperature range for bleach is between 55°F and 75°F. Hot water reduces the effectiveness of bleach. In diluted form, quaternary ammonium compounds are tasteless, colorless, and harmless.
Hospitals mostly employ the following five EPA-registered substances as disinfectants at the moment: quaternary ammonium, hypochlorite, accelerated hydrogen peroxide, phenolics, and peracetic acid.
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