The mass of one mole of this unknown compound 'XY' is 76.26gm.
Given here, the 1 mol of unknown compund 'XY' and mass of X and Y are 35.67gm and 40.59 gm respectively.
Molar mass of XY = molar mass of X + molar mass of Y=35.67gm + 40.59 gm = 76.26gm.
We can find given mass of 'XY' compound by formula,
Mole = Given mass/Molar mass
1= Given mass /molar mass
Given mass = molar mass.
Given mass = 76.26gm.
So, the given mass of XY is equals to 76.26gm.
Mole is defined as the unit of amount of substance. The quantity of amount of substance is measured in mole as 1mol contain exactly 6.023×1023 particles or entities. Mole is calculated by the ratio of the given mass and the molecular mass of the compound.
The relation of mole and molarity is given by the formula, Molarity is equals to no. of moles of solute divided by the solution in litres. S.I unit of molarity is moles per litre.
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experiment 1: spectroscopy-infrared (ir) spectroscopy and nuclear magnetic resonance (nmr) spectroscopy
EPR (ESR) Spectroscopy is compatible with leading brands but with fair and reasonable price.
EPR (ESR) Spectrometers for free radical, polymer materials, catalytic mechanism research.
What is Spectrometers ?
An equipment used to measure a physical quantity's spectrum is called a spectrometer. The term "spectrometer" is commonly used to refer to an optical spectrometer that measures the electromagnetic spectrum of light. Mass spectrometry and Auger electron spectroscopy, for instance, both use different types of spectrometers.
Measurements of light's characteristics in a particular area of the electromagnetic spectrum are made using an optical spectrometer. Light intensity is typically the variable quantity that is measured, though it might sometimes be anything else, such polarization.
The wavelength of light, which is frequently stated in a fraction of a meter but can also be expressed in a unit directly proportional to the energy of a photon, like the wave number, is the independent variable.
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EPR (ESR) Spectroscopy is compatible with leading brands but with fair & reasonable price. EPR (ESR) Spectrometers free radical, polymer materials, catalytic mechanism research.
What is Spectrometers ?
An equipment used to measure a physical quantity's spectrum is called a spectrometer. The term "spectrometer" is usually used to refer to an optical spectrometer that measures the electromagnetic spectrum of light.
Mass spectrometry and Auger electron spectroscopy, as an example , both use differing types of spectrometers.Measurements of light's characteristics during a particular area of the electromagnetic spectrum are made using an optical spectrometer. candlepower is typically the variable quantity that is measured, though it'd sometimes be anything else, such polarization.
The wavelength of sunshine , which is usually stated in a fraction of a meter but can also be expressed in a unit directly proportional to the energy of a photon, just like the wave number, is that the independent variable.
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Please figure out how to convert only to one significant figure.
Answer: How to convert only to one significant figure:
Explanation:
The method of rounding to a significant figure is often used as it can be applied to any kind of number, regardless of how big or small it is. When a newspaper reports a lottery winner has won £3 million, this has been rounded to one significant figure. It rounds to the most important figure in the number.
To round to a significant figure:
look at the first non-zero digit if rounding to one significant figure
look at the digit after the first non-zero digit if rounding to two significant figures
draw a vertical line after the place value digit that is required
look at the next digit
if it's 5 or more, increase the previous digit by one
if it's 4 or less, keep the previous digit the same
fill any spaces to the right of the line with zeros, stopping at the decimal point if there is one
Examples
Round 53,879 to 1 significant figure, then 2 significant figures.
5|3879 to 1 significant figure is 50,000
53|879 to 2 significant figures is 54,000
Notice that the number of significant figures in the question is the maximum number of non-zero digits in your answer.
Round 0.005089 to 1 significant figure, then 2 significant figures.
0.005|089 to 1 significant figure is 0.005
0.0050|89 to 2 significant figures is 0.0051
Sorry this was long,
But I hope this helped!
The separation of the components of a mixture is based upon the fact that each component has different ______________ properties. The components of a mixture are separated based on their ___________ properties.
The separation of the components of a mixture is based upon the fact that each component has different physical properties. The components of a mixture are separated based on their physical properties.
A mixture is the physical combination of two or more substances suspended in the form of a solution, suspension, or colloid. Mixtures generally are of two types: homogenous and heterogenous mixtures. Homogenous mixtures have a uniform composition as the particles are uniformly distributed. On the contrary, heterogeneous mixtures have a non-uniform appearance because of their easily distinguishable constituents distributed across the mixture.
The components of a mixture can be separated based on their physical properties by the methods like distillation, chromatography, filtration, etc. The physical properties based on which the components of mixtures can be separated include boiling point, ability to dissolve, or the size of constituent particles.
The varying physical properties contribute to separating molecules by evaporation, filtration, handpicking, etc.
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consider the following reaction: ca(oh)2(aq) + 2hcl(aq)®2 h2o(l) + cacl2(s) determine the limiting reactant when 1.00 g of each reactant is combined. what is the theoretical yield of h2o?
ca(oh)2(aq) + 2hcl(aq)®2 h2o(l) + cacl2(s)
the limiting reactant when 1.00 g of each reactant is combined is ca(oh)2.
What is limiting reagent?
The stoichiometry of chemical processes states that a specific number of reactants are required for the reaction to be complete. Other names for them are limiting reactants and limiting agents.
In a chemical reaction, there are two techniques to determine the limiting reagent. Comparing the mole ratio of the reactants involved in a chemical reaction is one way. Comparing the masses of the reactants involved in a chemical reaction is another way. The limiting reagent is the one that reacts with a smaller amount of product.
Since, Ca(OH)2 is in the ratio 1:2 with HCl, which means for two moles of HCl, one mole of Ca(OH)2 is consumed which is required in smaller amount, Thus if Ca(OH)2 is present in less amount the reaction depend on its concentration and is limited by it. so ca(oh)2 is the limiting reagent.
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1. Even though Ecuador and Norway are located in the northern hemisphere, Norway is colder compared to Ecuador. Explain.
Norway is a Nordic nation in North-Western Europe that borders Sweden, Finland, and Russia. Due to its reputation for having an exceptionally cold winter season, it has grown to be a very famous tourist destination in Europe, yet more than half of its yearly tourists arrive during the milder months of May to August.
The lowest temperature ever recorded in Norway was -51.4°c on New Year's Day in 1886. Although temperatures and meteorological conditions around the world vary, Norway may experience some rather extreme lows. Norway has a variety of climatic characteristics that explain why it has the coldest climate in all of Europe. Here are a couple of them justifications.
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What are the standard deviation and the relative standard deviation for the percent of cacl2 2h2o in the sample?
Standard deviation refers to the percentage of responses that fall inside particular points on a bell curve, whereas relative standard deviation refers to the amount of a standard deviation as a measure of the mean. Although both can be stated as departures from the mean, neither can be negative.
Relative standard deviation vs. standard deviationThe standard deviation measures how far a given collection of data deviates from the mean value. In contrast, a type of standard deviation is the relative standard deviation. The standard deviation calculates the accuracy of your results. It demonstrates how closely the outcomes matched the mean value.
While relative standard deviation quantifies the precision or standard deviation of the mean value. While relative standard deviation is referred to as RSD, the standard deviation is referred to as SD.
In chemistry, mathematics, and statistical calculations, the phrases standard deviation, and relative standard deviation are most frequently employed. These phrases are used to gauge a result's degree of precision. While relative standard indicates the amount of standard deviation, standard deviation measures how closely a result varies from the mean value. The standard deviation can be determined to be modest or significant. RSD and SD make analysis performance predictions. Our analysis is more accurate if these values are modest, and vice versa.
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Give an example of an extensive property in an intensive property of an iron nail
An extensive property is a property that depends on the amount of matter in a sample.
An intensive property is a property of matter that depends only on the type of matter in a sample and not on the amount.
Examples of Extensive properties:
The mass of an object is a measure of the amount of matter that an object contains. A small sample of a certain type of matter will have a small mass, while a larger sample will have a greater mass.Another extensive property is volume. The volume of an object is a measure of the space that is occupied by that object.Examples of Intensive properties:
The electrical conductivity of a pure substance is a property that depends only on the type of substance. Silver, gold, and copper are excellent conductors of electricity, while glass and plastic are poor conductors. A larger or smaller piece of glass will not change this property. Other intensive properties include color, temperature, density, and solubility.Read more about Intensive & Extensive properties:
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9. Sally Leadfoot was pulled over on her way from Syracuse to Ithaca by an officer claiming she was
speeding. The speed limit is 65 mi/hr and Sally had traveled 97 km in 102 minutes. How fast was
Sally’s average speed? Does she deserve a ticket?
10. An overzealous parkour jumper accidentally falls from a two story building. Don’t worry, his ninja-like
reflexes left him with only a minor ankle sprain (but don’t try this at home!) If the two story building was
20.0 ft tall, how many millimeters was this? (2.54 cm = 1 in).
1. Sally's average speed is 35.38 miles/hr. She deserves no ticket
2. The 20.0 ft tall building is 6096 mm tall.
Miscellaneous calculationFor the first problem, recall that: speed = distance/time.
The distance covered by Sally is 97 km within 102 minutes.
1 km = 0.62 miles
97 km = 0.62 x 97
= 60.14 miles
60 minutes = 1 hr
102 minutes = 102/60
= 1.7 hours
The average speed of Sally can be calculated as:
60.14/1.7 = 35.38 miles/hr
Since the speed limit is 65 mi/hr, this means Sally's speed is still within acceptable limits and does not deserve a ticket.
For the second problem:
1 ft = 12 inches
20 ft = 12 x 20
= 240 inches
1 inch = 2.54 cm
240 inches = 2.54 x 240
= 609.6 cm
1 cm = 10 mm
609.6 cm = 10 x 609.6
= 6096 mm
Thus, the 20.0 ft tall building is 6096 mm tall.
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A carbonated soft drink that has a ph of 3 is ________ times more acidic than water.
Compared to water, a carbonated soft drink with a pH of 3 is 10,000 times more acidic.
What is meant by acidic in nature?
Acids include different types of acids and vinegar; they differ from bases in that they have a lower pH. The Latin term acidus, which means "sour or harsh," is where the word acid, which originally meant "of the taste of vinegar," originates from.
Bases are compounds that can accept a proton, while acids are substances that can donate a proton.
The answer is 10,000 because every pH unit change makes something 10 times more acidic.
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you have to calculate the volume of a gas sample with mass of 1.000 × 103 g and density of 1.027 g/l, but you have forgotten the formula. which way of reasoning would help you in finding the correct mass?
The correct volume of the object is 974 L.
What is the density?
The term density refers to the ratio between mass and volume. We know that we could be able to obtain the mass or the volume using the formula for density. Knowing that;
Density = mass/volume
volume = mass/density
Volume = 1.000 × 10^3 g/ 1.027 g/l
Volume = 974 L
The correct volume of the object is 974 L.
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an aqueous potassium iodate ( kio3 ) solution is made by dissolving 508 grams of kio3 in sufficient water so that the final volume of the solution is 2.90 l. calculate the molarity of the kio3 solution.
An aqueous potassium iodate solution is made by dissolving 508 grams of in sufficient water so that the final volume of the solution is 2.90 L then its molarity is 0.818 M .
Calculation ,
Given mass ( m ) = 508 grams
molar mass ( M ) = 214 g/mol ( known )
Number of moles ( n ) = given mass/molar mass = 508 grams / 214 g/mol
Number of moles ( n ) = 2.37 moles
Volume of the aqueous potassium iodate ( V ) in liter = 2.9 L
molarity is calculated as,
Molarity = number of moles / volume of the solution = 2.37 moles / 2.9 L
Molarity = 0.818 M
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Need help FAST! Will rate 5
When mercury oxide HgO is heated, it decomposes into mercury Hg and oxygen O2.
1) if 28.4 g of HgO decomposes and produces 2.0 g of oxygen, how many grams of Hg are produced?
____________________g
Use the correct sigfigs (subtraction)
2) What is the percent by mass of Hg in HgO?
___________________%
Use correct sigfigs (division)
If 28.4 g of HgO decomposes and produces 2.0 g of oxygen, then 26 grams of Hg is produced.
What is decomposition reaction?Decomposition reactions occur when complex chemical entities split apart into smaller components. Decomposition reactions often demand energy input.
There are three different kinds of breakdown reactions: thermal, photolytic, and electrolytic.
[tex]Mass_{reactant[/tex] = [tex]Mass_{product}[/tex]
[tex]Mass_{mercury oxide[/tex] = [tex]Mass_{mercury} + mass_{oxygen}[/tex]
28g = [tex]mass_{mercury}[/tex] + 2g
[tex]mass_{mercury}[/tex] = 26g
Thus, 28.4 g of HgO decomposes and produces 2.0 g of oxygen, then 26 grams of Hg is produced.
[tex]percentage mass_{mercury} = \frac{mass_{mercury}}{mass_{mercury}oxide}[/tex] X 100%
= 26g/28g
= 93%
thus 93% is the percent by mass of Hg present in HgO.
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enter your answer in the provided box. an important industrial route to extremely pure acetic acid is the reaction of methanol with carbon monoxide: h5sil950 use bond energies to calculate the heat of reaction.
According to the question, the heat of the reaction has been -22 kJ/mol where a negative sign illustrates the occurrence of the exothermic reaction.
What is the Heat of reaction?The heat of reaction may be defined as the amount of energy that is significantly absorbed or liberated by the system in order to form the products. This is calculated on the basis of bond energies.
The energy constituent by each bond in the reactant has been the heat of the reactant, and the energy of the product has been the heat of the product.
The heat of the reaction can be calculated by the following formula:
H= [tex]H_r_e_a_c_t_a_n_t - H_p_r_o_d_u_c_t[/tex].The reactant molecules are [tex]CH_3OH[/tex] and C≡O.
The bond energy of the reactant is as follows:
[tex]H_r_e_a_c_t_a_n_t[/tex] = 3 × C-H + C-O + O-H + C≡O.
= 3 × 413 + 358 + 467 + 1070
= 3134 KJ/mol.
The product molecule has been [tex]CH_3COOH[/tex].
The bond energy of the product is as follows:
[tex]H_p_r_o_d_u_c_t[/tex] = 3 × C-H + C-O + O-H +C-C + C = O.
= 3 × 413 + 358 + 467 + 347 + 745.
= 3156 KJ/mol.
The heat of the overall reaction is as follows:
ΔH = [tex]H_r_e_a_c_t_a_n_t - H_p_r_o_d_u_c_t[/tex]
= 3134 - 3156 = -22KJ/mol.
Therefore, the heat of the reaction has been -22 kJ/mol where a negative sign illustrates the occurrence of the exothermic reaction.
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how do you think the layers of liquid would look if you put the liquids into the cylinder in a different order? why?
Answer:It actually does not matter in which order you add the three different liquids into your jar; the layers will always end up being the same: The corn syrup settles on the bottom, the colored water is in the middle and the vegetable oil floats on the top.
Explanation:
a chemist determined by measurements that moles of calcium participated in a chemical reaction. calculate the mass of calcium that participated in the chemical reaction.
A chemist determined by measurements that moles of calcium participated in a chemical reaction. The mass of calcium that participated in the chemical reaction is 0.40 g
What are chemical reaction?Chemical reaction is define as a process that lead to chemical transformation of one set of chemical substance to another.
There are basically four types of chemical reaction.
Synthesis reaction Decomposition reactionSingle replacement reactionDouble replacement reactionMass of calcium can be calculated as:
Molar mass of Ca = 40.0g/mole
Number of mole of Ca in chemical reaction = 0.010 moles
So ,
Mass = number of moles x molar mass
= 0.010 moles x 40.0g/mole
= 0.40 g
Thus, the mass of calcium that participated in the chemical reaction is 0.40 g
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Your question is incomplete, but probably your full question was
A chemist determined by measurements that 0.010 moles of calcium participated in a chemical reaction. calculate the mass of calcium that participated in the chemical reaction
A turtle moves at a speed of 1.0 km/h. How fast is the turtle
moving in meters per second (m/s)?
Answer:
0.278m/s (3sf) OR 0.28m/s (2dp)
Explanation:
1km = 1000m
1h = 3600s (60mins x 60 secs)
1000m/3600s (simplify)
10m/36s (simplify by dividing both sides by 36)
(1/36)m/s OR 0.27777777777ms/s
Round up:
0.28m/s (2dp) or 0.278m/s (3sf)
Alice added sodium chloride to water and stirred the water for several minutes. Alice is most likely trying to demonstrate that ionic compounds.
Sodium chloride is an ionic compound. The chemical name of Sodium chloride is NaCl.
What are ionic compounds?Ionic compounds are made up of ions. They have charged particles. Ionic compounds when dissolved in solvents they form ions. Sodium chloride losses Na + and cl ions. Magnesium oxide will form mg2+ and O2 ions.
Ionic compounds dissolve in polar solvents. Examples are water, methanol and formamide. For ionic compounds to dissolve there will be ionic compounds will form.
Ionic bonds are not directional. There would be electrostatic or columbic attraction will be form in molecules. The bonding seen in ionic compounds is called ionic bonding. There are two types of ions seen in molecules such as positive ions and negative ions.
Therefore, Sodium chloride is an ionic compound. The chemical name of Sodium chloride is NaCl.
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Answer: B
Explanation: JUST TOOK THE QUIZ
specify whether each of the items listed is hydrophilic or hydrophobic by dragging the labels into the appropriate box.
Hydrophilic;
Polar compounds
water
ions
glucose
Hydrophobic;
Triglycerides
cholesterol
Lipids
Oil
Carbohydrates
What are hydrophilic substances?The term hydrophilic substances is used to describe the substances that could dissolve in water. They are those substances that are water soluble. Somehow, the substances must be polar because in chemistry like dissolves like.
The hydrophobic substances are those substances that do not dissolve in water. They are nonpolar and interact with other nonpolar substances.
The classification of the substances took place below;
Hydrophilic;
Polar compounds
water
ions
glucose
Hydrophobic;
Triglycerides
cholesterol
Lipids
Oil
Carbohydrates
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fill in the blank question. in the quantum mechanical model of the atom, an electron is viewed as a wave-particle that occupies a three-dimensional space near the nucleus. the movement of the electron is described by a function, which is also called an atomic .
In the quantum mechanical model of the atom, an electron is viewed as a wave-particle that occupies a three-dimensional space near the nucleus. The movement of the electron is describes be a function, which is also called an atomic orbital.
An electron possesses dual nature, i.e. it has both wave as well as particle nature.
According to this theory, since there is wave associated with every electron so, it also possesses a wave function ψ.
However, there is no such physical significance of ψ but ψ² has.
ψ² tells the maximum probability of finding an electron in a particular region.
This region where the probability of finding an electron of an atom is maximum is known as atomic orbital.
There are different shapes of the atomic orbitals.
Some of the orbitals and their shapes are mentioned below:
(I) s orbital - spherical
(ii) p orbital - dum-bb-ell
(iii) d orbital - double dum-bb-ell
(iv) f orbital - ( no discrete shape)
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Three specific types of laboratory waste containers used for accumulating potentially hazardous wastes are as follows:________
Three specific types of laboratory waste containers are: Chemical Waste Container, Bio Hazardous Waste Container and Radioactive Waste Container.
Chemical waste is collected in appropriate containers able to be properly closed.
Biohazardous waste containers keep infectious waste separate from everyday trash.
Radioactive Waste containers stock solid radioactive waste produced during radio isotopes manipulation.
The Material Safety Data Sheet (MSDS) is a detailed fact sheet summarizing information about a chemical's hazardous ingredients.
Nuclear (radioactive) waste is hazardous to all forms of life and the environment.
Long term storage of radioactive waste is needed. It is important the stabilization of the waste into a form which will neither react nor degrade over many years.
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One of the most profound ideas proposed by Max Planck was
O electrons constantly emit light.
O special relativity.
O electron energies are quantized
O atoms follow the "plum pudding" model
According to the research, the correct option is electron energies are quantized. Max Planck was a popular German physicist who proposed that electron energies are quantized, considered to be the founder of quantum theory.
What is quantum theory?It is a probabilistic and quantification theory by Max Planck giving the name of the minimum amount of clusters to atoms that radiates energy formed by corpuscles in the form of light or heat only, as small packets.
In this sense, Planck assumed that light does not travel as a particle but as packets of light in the form of electromagnetic radiation which he called quanta, this was the basis on which what is known as quantum theory was founded.
Therefore, we can conclude that according to the research, the correct option is electron energies are quantized. Max Planck was a popular German physicist who proposed that electron energies are quantized, considered to be the founder of quantum theory.
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Write a balanced, net ionic equation for the precipitation reaction of cacl2 and cs3po4 in an aqueous solution. Remember to include the proper physical states and charges of ions. When writing ions, if a charge number is not 1, place the charge number before the charge sign. If a charge sign is 1, do not include the charge number in the formula.
The balanced chemical equation for the precipitation reaction of CaCl₂ and Cs₃PO₄ in an aqueous solution is:
3Ca²⁺(aq) + 2PO₄³⁻(aq) → Ca₃(PO4)₂(s)
The insoluble salts Ca₃(PO4)₂ and CsCl are created when the calcium ion in CaCl₂ interacts with the phosphate ion in Cs₃PO₄. CaCl₂(aq) + CsO₄(aq) Ca₃(PO4)₂(s) + CsCl.
The unbalanced reaction is:
CaCl₂(aq) + Cs₃PO₄(aq) → Ca₃(PO4)₂(s) + CsCl(aq)
To balance the calcium:
3CaCl₂(aq) + Cs₃PO₄(aq) → Ca₃(PO4)₂(s) + CsCl(aq)
The chlorides:
3CaCl₂(aq) + Cs₃PO₄(aq) → Ca₃(PO4)₂(s) + 6CsCl(aq)
And the Cs:
3CaCl₂(aq) + 2Cs₃PO₄(aq) → Ca₃(PO4)₂(s) + 6CsCl(aq)
This is the balanced reaction, the ionic equation is:
3Ca²⁺(aq) + 6Cl⁻(aq) + 6Cs⁺(aq) + 2PO4³⁻(aq) → Ca₃(PO4)₂(s) + 6Cs⁺(aq) + 6Cl⁻(aq)
Subtracting the ions that don't react:
3Ca²⁺(aq) + 2PO4³⁻(aq) → Ca3(PO4)2(s)
This is the net ionic equation
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Once separated, is each component of the solid mixture a pure element or a pure compound?
Once separated, is each component of the solid mixture could be a pure element or a pure compound.
Any object with mass and a specific quantity of space is referred to as a matter. Element, compound, and mixture classifications are used to categorise matter.A pure compound contains just that one component; there are no additional components. Mixtures of substances, chemicals, or components and compounds might be considered impure materials.If the substance is pure, it is either an element or a compound.If a substance can be divided into its component elements, it is a compound.If a substance is not chemically pure, it is either a homogeneous mixture or a heterogeneous mixture.If the composition remains the same throughout, the combination is homogeneous.Baking soda, sugar, and salt are pure chemical compounds.Learn more about mixtures here:
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environmental researchers have collected rain acidity data for several decades. they want to see if there is any evidence that attempts to reduce industrial pollution have produced a trend toward less acidic rainfall. they should display their data in a(n)
Environmental researchers have collected rain acidity data for several decades. They want to see if there is any evidence that attempts to reduce industrial pollution have produced a trend toward less acidic rainfall. They should display their data in a Time plot.
Acid Rain: What Is It?
Any type of precipitation that contains acidic elements, such as sulfuric or nitric acid, that falls to the ground from the atmosphere in wet or dry forms is referred to as acid rain, also known as acid deposition. Rain, snow, fog, hail, and even acidic dust might fall under this category.
Only one variable—the acidity level of the rainfall over a specific time period—will be present in the data used to create the plot or graph. But because the gbwre data is time-dependent, the plot is a time series. As a result, this is a two-dimensional univariate plot with time on the other axis and the acidity label Rainfall on the first. The time series plot is therefore the appropriate type of graph to use to illustrate this kind of data.
Questions:
Environmental researchers have collected rain acidity data for several decades. They want to see if there is any evidence that attempts to reduce industrial pollution have produced a trend toward less acidic rainfall. They should display their data in a(n)... a. Bar graph b. Time plot c. Histogram d. Box plot
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calculate the mass of HNO3 obtained when 20.0g of KNO3 reacts completely with excess concentrated H2SO4
The mass of HNO3 obtained is 12.46 g from the given reaction.
The chemical reaction is :
Potassium Nitrate + Sulphuric acid ------> Potassium Bisulphate + Nitric acid.
The above reaction is basically used for the making of nitric acid.
Less than 200 degree celcius the Nitric acid if more than 200 degree celcius then it will form Potassium Sulphate.
Now,
1 mol of KNO3 reacts with1 mol of concentrated H2SO4 to give 1 mol HNO3
Molar Mass of KNO3 = 101.1 g
Molar mass of H2SO4 = 98.07 g
Mass of H2SO4 that can react with 20 g of KNO3 = (20 g* 98.07 g )/ 101.1 g
= 19.4 g
Molar mass of nitric acid= 63.01 g
Hence mass of nitric acid produced by 20 g of KNO3 = (20 g * 63.01 g ) / 101.1 g = 12.46 g
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the c―h bond in acetone, (ch3)2c═o, has a pka of 19.2. draw two resonance structures for its conjugate base. then, explain why acetone is much more acidic than propane, ch3ch2ch3 (pka
The resonance structure of the c―h bond in acetone, (ch3)2c═o, has a pka of 19.2 is given below
What is Resonance ?When a periodic force is applied to a system and its natural frequency is equal to or nearly equal to the frequency of the applied force, resonance is the phenomenon of enhanced amplitude that results.
Since propane lacks a double bond or an atom with a lone pair of electrons, the negative charge on acetone's conjugate base cannot be sustained by resonance structure.
If the applied vibration's frequency matches the body's natural frequency, the body will begin to vibrate with a very significant amplitude. Resonance is the name given to this phenomena.
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If you originally had 200g of substance A, how much will you have left after 4
half-lives?
If you originally had 200 g of substance A , 50 g of reactant have left after 4 half - lives .
At four half life the fraction remaining of a substance is 1/16 or 0.25 of initial concentration and percentage remaining is 25 % .
So , If you originally had 200 g of substance A is present then amount of reactant left after 4 half-lives = 200 g × 0.25 = 50 g .
Example of half - life is given below ,
Within one half-life, the amount of radioactive nuclei present at any particular time will be reduced to half. For instance, if a sample contained 100g of Cf-251 at some point, there would still be 50g of Cf-251 after 800 years. There would only be 25g left after an additional 800 years (a total of 1600 years).
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Which statement best describes a scientific question?
It must be based on a hypothesis.
It must be supported by data.
It must be testable.
It must be original.
Answer:
It must be based on a hypothesis
Explanation:
if i remember correctly
Which wave has the smallest amplitude?
Answer : D , the red one.
Answer:
d
Explanation:
it is the smallest
you and a friend are studying for a chemistry exam. what if your friend tells you, "since exothermic processes are favored and the sign of the enthalpy change tells us whether or not a process is endothermic or exothermic, the sign of dhsoln tells us whether or not a solution will form"? how would you explain to your friend that this conclusion is not correct? what part, if any, of what your friend says is correct?
The assertion "It is true that " since exothermic processes are favored and the sign of the enthalpy change tells us whether or not a process is endothermic or exothermic .
The phrase "the sign of [tex]dH_{sol}[/tex] tells us whether or not solution will form " is not a fact .
All chemical reactions fall into one of two categories: exothermic reactions or endothermic reactions. When energy is lost to the environment during an exothermic reaction, the enthalpy change of the reaction is negative. A type of reaction known as an endothermic reaction results in a positively altering equilibrium by absorbing energy from the surrounding environment.
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