pH after adding 10.0 ml of acid = 9.81, pH after adding 20.0 ml of acid = 5.31.pH after adding 30.0 ml of acid = 1.20
In chemistry, the pH scale is used to define the acidity or alkalinity of an aqueous solution. Historically, pH stood for "hydrogen potential". The pH values of acidic solutions are usually lower than those of basic or alkaline solutions.
An acid (acid catalysis) is any substance that tastes unpleasant in aqueous solution, turns blue litmus paper red, reacts with some metals to release hydrogen, combines with bases to form salts, and stimulates chemical processes. A Brnsted-Lowry acid or Lewis acid is a molecule or ion that has the ability to donate a proton or form a covalent bond with an electron pair. Proton donors, also known as Brnsted-Lowry acids, are the first class of acids.
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three naturally occurring isotopes of an element are shown in the models below. what do the isotopes have in common?
same number of protons but different numbers of neutrons.
Isotopes are members of a family of an element that all have the same number of protons but different numbers of neutrons.
Isotopes are atoms of the same element that have different numbers of neutrons but the same number of protons and electrons. The difference in the number of neutrons between the various isotopes of an element means that the various isotopes have different masses.
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The 18th-century chemist Antoine Lavoisier and his wife Marie-Anne put fruit into a glass container, and then they sealed it. After weighing the fruit and container, they left it in a warm place for a few days. The fruit decayed, and there was condensation inside the glass and gas in the container. Lavoisier and his wife weighed the decayed fruit and the container again. The weight was the same. What scientific principle did the Lavoisier's experiment support?
Explanation:
The 18th-century chemist Antoine Lavoisier and his wife Marie-Anne put fruit into a glass container, and then they sealed it. After weighing the fruit and container, they left it in a warm place for a few days. The fruit decayed, and there was condensation inside the glass and gas in the container. Lavoisier and his wife weighed the decayed fruit and the container again. The weight was the same. What scientific principle did the Lavoisier's experiment support?
the titration of an impure sample of khp found that 36.00 ml of 0.100 m naoh was required to react completely with 0.758 g of sample. what is the percentage (%) of khp in this sample
The titration of an impure sample of KHP found that 36.00 ml of 0.100 m NaOH was required to react completely with 0.758 g of sample. the percentage % of KHP in this sample is 96.9 %.
The equation for the reaction is :
KHP + NaOH -----> KNaP + H₂O
number of moles of NaOH = volume in L × molarity
= 0.0360 × 0.100
= 0.0036 mol
moles of KHP = moles of NaOH = 0.0036 mol
mass of KHP = molar mass × moles
= 204.2 × 0.0036
= 0.735 g
percentage of purity KHP =( mass of pure KHP / mass of impure ) × 100 %
= (0.735 / 0.758 ) × 100 %
= 96.9 %
Thus, The titration of an impure sample of KHP found that 36.00 ml of 0.100 m NaOH was required to react completely with 0.758 g of sample. the percentage % of KHP in this sample is 96.9 %.
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calculate the empirical formula for a compound that contains 40.0% carbon, 6.70% hydrogen, and 53.3% oxygen
The empirical formula for the hydrocarbon is CH₂O.
First, we assume that we have 100g of formaldehyde
According to the question we have 40.0% of carbon, 6.70% of hydrogen, and 53.3% of oxygen. With help of this, we calculate the moles of individual elements.
Moles of C = 40.0 g of C × 1 mol of C / 12.01 g C = 3.331 mol C
Moles of H = 6.7 g of H × 1 mol of H / 1.008 g H = 6.65 mol H
Moles of O = 53.3 g of O × 1 mol of O / 16.00 g O = 3.331 mol O
To get the molar ratio we divide all the moles by the smallest moles which are 3.331. From here the ratio comes out to be C: H: O = 1:2:1.
Thus the empirical formula is, CH₂O.
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Calculate the AG° at 298 K for the following reaction. Show your work.
Fe₂O3(s) + 13CO(g) → 2Fe(CO),(g) + 3CO₂(g)
-824.2 -110.5
-733.8
-393.5
AH (kJ/mol)
87.4 197.6
AS (J/mol K)
445.2
213.6
The ΔG at 298K of the given reaction is -304.08kJ/mole.
Combustion is a high-temperature exothermic redox chemical reaction between a fuel and oxygen oxides. Photosynthesis is an example of an involuntary reaction. Plants absorb water and carbon dioxide. But for it to change, it needs sunlight. This is an involuntary reaction.
calculation:-
ΔG = ΔH -TΔS
Hence,
= (-733.8-393.5+824.2+110.5) - 298*(445.5+213.6-87.4-197.6)/1000
= -304.08kJ/mole
A spontaneous reaction is one that promotes the formation of products under the conditions under which the reaction occurs. A roaring campfire is an example of a natural reaction because it is exothermic. Processes that are spontaneous in one direction under certain conditions are not spontaneous in the reverse direction. For example, at room temperature and normal atmospheric pressure ice naturally melts but water does not naturally freeze.
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write an equation that relates the average rate of the reaction to the rate of formation of products and consumption of reactants.
Average rate of formation of products = 1/n (Change in concentration /Time rate) = -Average rate of consumption of reactants.
What is Chemical reaction ?
There are chemical reactions taking place all around us. Nothing could be further from the reality, despite the fact that we occasionally link chemical processes with the sterile surroundings of the test tube and the lab. A staggering, nearly incomprehensible variety of new substances and energy changes actually result from the enormous number of alterations that occur in our environment every second of every day.
Chemical reactions happen whether or not you want them to in nature, where they can be considerably less controlled than in a lab. They can also be more messier. Whether it be a forest fire that is blazing.
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Does alcohol really burn off when cooking? what are the possible substitutions for alcohol in recipes?.
Yes, alcohol burns off when cooking. To make sure that alcohol cooks out completely, you need to cook the food longer. The possible situation for alcohol in recipes is fermentation.
Foods undergo fermentation process for saving and storing them for longer periods through preservation.
In general, alcohol is used during fermentation process to increase their storage time.
During fermentation, food is cooked for about 15 minutes. That is why most foods contain almost 40 percent of alcohol in them.
In order to remove alcohol, it is necessary to cook food longer. The longer you cook, the more alcohol cooks out.
However, to remove all traces of alcohol, make sure to cook food for about three hours.
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question: methanol, ch4o, is finding use as a fuel additive. describe the effect of each of the following changes on the equilibrium mixture for the combustion of methanol: a. adding more co2(g) b. adding more o2(g) c. increasing the temperature d. adding a catalyst
On adding more CO2 equilibrium shifts to left, adding more oxygen the equilibrium shift to right, increasing a temperature will shift the equilibrium to left and adding the catalyst will not affect the equilibrium.
According to Heisenberg Uncertainty Principle, if the equilibrium of a system of reaction is disturbed by making any changes in the property the reaction will shift into that direction by itself that stabilizes the equilibrium again.
According to the reaction,
CH4O + O2 = H2O + CO2 + Heat
a. Adding more CO₂ will shift the reaction towards the left side or we can say that adding carbon dioxide into the system will shift the reaction towards the reactant side. Because the concentration of carbon dioxide on the product side has increased, the equilibrium is disturbed so in order to stabilize the equilibrium again the reaction will shift towards the reactant side.
b. Adding more oxygen means that we are adding more amount of reactants which disturbs the equilibrium of the reaction so to stabilize the equilibrium again the reaction will shift towards the product side.
c. Increasing the temperature of the equation means that we are giving heat to the system which means that the equation or the system will shift toward the product side because the reaction is exothermic in nature.
d. Adding a catalyst will not affect the equilibrium of the reaction it will only increase the rate of the reaction.
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What are shared in a covalent bond?
a. ions
b. Lewis structures
c. electrons
d. dipoles
Electrons are shared in covalent bonds.
What is a covalent bond?
The exchange of one or more pairs of electrons between two atoms forms a covalent connection. The two atomic nuclei are drawing these electrons in unison. When there is insufficient space between two atoms' electronegativities for an electron transfer to take place and create ions, a covalent bond is formed. Bonding electrons are shared electrons that are present in the region between the two nuclei. The bound pair serves as the "glue" that binds the atoms in molecular structures.
The only covalently bound substance that is the simplest is a hydrogen molecule. Two hydrogen atoms with one electron in each's 1s orbital make up the compound. The covalent link between the two hydrogen atoms allows them to share their two electrons and give each of them a helium-like electron configuration.
Hence, electrons are shared in covalent bonds.
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in the tlc experiment silica gel is used as a solid phase to differentiates between what kind of compounds?
Silica gel and alumina are the most often utilized adsorbents. A wide range of chemicals, including hydrocarbons, alcohols, ketones, esters, acids, azo compounds, and amines, are separated using silica gel.
Because of its outstanding separation capabilities, the Silica Gel G for Thin Layer Chromatography as binder is most commonly employed as an adsorbent in thin-layer chromatography.
What is Silica Gel?Silica gel is a porous and amorphous type of silicon dioxide composed of an uneven tridimensional structure of alternating silicon and oxygen atoms with nanometer-scale holes and pores. The spaces might be filled with water or other liquids, or they could be filled with gas or a vacuum.
Silica gel is a desiccant, which means it is a drying agent. Its purpose is to absorb moisture and condensation from its surroundings. It is a very efficient and cost-effective method for businesses to keep their items fresh and dry for consumers during storage and shipping procedures.
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Complete the mechanism for this reaction by drawing the intermediates formed and adding the missing curved arrow notation.
When hydrochloric acid dissolves in water, the hydronium ion is created. Analyzing the developing bond modifications is helpful. Hydrochloric acid is acting as an acid, and water is acting as a base. Take into account the variations in bonding between the raw materials and the finished goods.
The hydronium ion (H3O+) observed in the products was produced by joining one of the oxygen atom's lone pairs to a hydrogen atom. A chloride ion was created as a result of the hydrogen-chlorine bond in HCl being broken and the electrons in this bond turning into a lone pair on the chlorine atom. The overall charge of the reactants is the same as the overall charge of the products.
This demonstrates how the new H-Cl bond is created by joining an electron-poor hydrogen atom of the hydronium ion to a lone pair of electrons from the electron-rich chloride ion. The oxygen-hydrogen link breaks because hydrogen can only make one bond, leaving the electrons of the oxygen atom with a lone pair.
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Which statement is a pattern in the fossil record?
A. Which statement is a pattern in the fossil record?
B.The gas ratios in the atmosphere have been stable since the beginning of the fossil record.
C.Earth’s climate has been stable since the beginning of the fossil record.
D.Multiple mass extinction events have occurred in Earth’s history.
The statement multiple mass extinction events have occurred in Earth’s history is a pattern in the fossil record (Option D).
What are multiple mass extinction events?Multiple mass extinction events are phenomena in the geological periods in which occurred the removal of certain groups of species and it can be tracked by serving the fossils in the fossil record.
Therefore, with this data, we can see that multiple mass-extinction events refer to the disappearance of certain taxonomic groups in the fossil record, which is one of the most common characteristics of this type of record.
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six solutions are made by dissolving a certain amount of each of the six substances in 500. g water. if the freezing point of the each aqueous solution is the same, which substance is added to water in the largest amount, in grams? assume all ionic compounds dissociate 100% to form ions in solution.
Since KCl has the highest molar mass when it is added to water, it will have the most amount, in grams, if the freezing point of each aqueous solution is the same.
An essential accumulative feature of the solution is a depression in the freezing point. This is signified by: T=Kfm. Here, the symbol for freezing point change is (T). Additionally, m is morality, and Kf is the freezing point constant. One of the matter's physical characteristics is its temperature.
1) Options list:
A. (NH₄)₂CO₃
Ionic Equation:
(NH₄)₂CO₃ → 2(NH₄)⁺ + {CO₃}⁻ [i = 3]
B. KCl
Ionic equation:
KCl → K⁺ Cl⁻ [i = 2]
D.NH₄Cl
Ionic equation:
KCl → K⁺ Cl⁻ [i = 2]
F. NaCl
Ionic equation:
NaCl → Na⁺ + Cl⁻ [i = 2]
G. CH₃OH
Ionic equation:
CH₃OH → CH₃⁺ + OH⁻ [i = 2]
H. MgCl₂
Ionic equation:
MgCl₂ → Mg² + 2Cl⁻ [i = 3]
2) Utilizing the formula
ΔT = iKᵇmsolute
ΔT = iKfmsolute
ΔT = T° - T
Here, T° is both the solution's temperature and the temperature of the pure solvent.
Suppose that T° is zero.
ΔT = 0 - T = -T
The greater negative the temperature, the lower the freezing point. The freezing point of the solution is lowered when a solute is added to the solvent. The formula states that a lower molality gives a solute the ability to be added to a greater extent and produce a smaller change in temperature.
To obtain a smaller shift in temperature, the molality should be the lowest possible. The quantity of moles of solute in one kilogram of solvent is referred to as molality.
Morality = (Number of moles / 1) * (1 / Mass of solvent in kg)
Morality = (Mass of solute / Molar Mass of solute) * (1 / Mass of solvent in kg)
In this case, the solvent weighs 0.5 kg (constant)
Morality ∝ (Mass of solute / 1)
OR
Morality ∝ (1 / Molar Mass of solute)
With a smaller mass of a material or a larger molar mass of a solute, the molality will be lower. Only the solvent's freezing point and the solute's molar mass are under control under the given conditions. Despite the fact that KCl has a higher molar mass than (NH₄)₂CO₃, (NH₄)₂CO₃ will produce more ions at 100% dissociation than KCl. As a result, there will be fewer moles for the KCl.
The amount of KCl in grams will be the highest since it has the highest molar mass when it is added to water.
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COMPLETE QUESTION:
Six solutions are made by dissolving a certain amount of each of the six substances in 500. g water. If the freezing point of each aqueous solution is the same, which substance is added to water in the largest amount, in grams? Assume all ionic compounds dissociate 100% to form ions in the solution.
ΔT = iKbmsolute ΔT = –iKfmsolute
Select one:
A. (NH4)2CO3
B. KCl
C. The largest mass (g) of substance added is the same for two of the solutions.
D.NH4Cl
E. Insufficient information is provided.
F. NaCl
G. CH3OH
H. MgCl2
The correct answer should be "B" or KCl, but I don't understand why
g if a hand cream appears smooth and uniform after you prepared it, but after a week of storage most of the water and most of the oil separated, what do you think must have gone wrong with the preparation?
Because of Emulsion, when we store hand cream for a week its oil and water get separated.
Water and oil are necessary to make hand cream. water is an emulsifying agent.oil and water mixtures are emulsions when shaken together.The oil will form droplets and dispersed throughout the water.In this process,the most necessary is to mix the oil and water properly.The content of the ingredients may have been miscalculated or the temperature of the water is not enough.
Emulsifiers are added to hand cream.This is based on chemicals phospholipids.These are obtained from plants,nuts,berries ,leafs etc.
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a 200. g sample of a metal is heated to 54 degrees celsius and then dropped into 119. g of water in a calorimeter. the temperature of the water rises from 21.0 degrees celcius to 41.0 degrees celcius. what is the specific heat of the metal (j/g.k)?
The specific heat of given metal is 3.83 j/g.k
What is specific heat?Specific heat, the amount of heat required to raise the temperature of 1 gram of a substance by 1 degree Celsius. Units of specific heat are usually calories or joules/grams . Celsius.
Considering:
Heat gain by water = Heat lost by metal
Qₐ = Qₓ
mₐ cₐ (T₂ - T₁) = mₓ cₓ (Tₙ - T₂)
Where, mₐ = 119 g (mass of water)
cₐ = 4.186 j (specific heat of water)
T₂ = 41.0°C (final temperature of water)
T₁ = 21.0°C (initial temperature of water)
mₓ = 200 g (mass of metal)
cₓ = specific heat of metal
Tₙ = 54°C (Initial temperature of metal)
Now, substitute the values in the equation mentioned above,
119 × 4.186 × (41.0 - 21.0) = 200 × cₓ × ( 54 - 41.0)
9962.68 = 2600 cₓ
cₓ = 3.83 j/g.k
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When 200.0 g water goes from a temperature 10.0°C to 40.0 °C, is heat absorbed or released? Calculate the amount of heat absorbed/released.
1. Heat energy is absorbed
2. The amount of heat absorbed is 25104 J
1. How do I know if heat is absorbed or released?
From the question given, we can see that the temperature of the water moved from 10.0°C to 40.0 °C. This simply means the water absorbed heat to increase its temperature.
2. How do I determine the heat absorbed?
The heat absorbed can be obtained as follow:
Mass of water (M) = 200 gInitial temperature (T₁) = 10 °CFinal temperature (T₂) = 40.0 °CChange in temperature (ΔT) = 40 – 10 = 30 °CSpecific heat capacity of water (C) = 4.184 J/gºC Heat absorbed (Q) =?Q = MCΔT
Q = 200 × 4.184 × 30
Q = 25104 J
Thus, the heat absorbed is 25104 J
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PLEASE HELP ASAP, DUE TODAY. (Also, an explanation would be helpful, but you don’t have to give one)
I don't know much but I hope I helped you even a little bit.
a vessel contains 0.611 grams of butane gas (c4h10(g)) and molecules of oxygen gas. after the butane is reacted with the oxygen, how many molecules of co2(g) are formed and what is the theoretical yield of water?
0.936g is the theoretical yield of water
CO2 molecules = moles x Avogadro's number.
= 01034644x 6.022x1023
(2·0866 X 1022] (approx)
1 moles of O2 produce 6 moles of 420 from breath.
Theoretical 4x01060627 yield of H2O = Males of H2O X Molar Mass = 0.060627 moles of 02 generate.
= 0.051966 moles
10.051966 X 18.01528
0.936g
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in aqueous solutions, excess hydrogen ions bind to nearby water molecules, so it is generally considered more accurate to write h (aq) as h3o (aq). what is the name of the h3o ion?
In aqueous solutions, excess hydrogen ions bind to nearby water molecules, so it is generally considered more accurate to write h (aq) as H₃O (aq) then name of the H₃O ion is hydronium ion
The hydrogen ion in aqueous solution is no more than proton and a bare nucleus although it carries only a single unit of positive charge and this charge is concentrated into a volume of space that is only about a hundred million as large as volume occupied by smallest atom in case of water this will be the lone pair electron of the oxygen atom and the tiny proton will be buried within the lone pair and will form a shared electron bond with it and creating a hydronium ion means H₃O⁺ and here H₂O is the base and the product H₃O⁺ is the conjugate acid of water
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three samples of an ideal gas, all at the same temperature, occupy identical containers with the same volume. assume that the mass of the particle is proportional to its size. which of the gas samples has the greatest pressure?
The three samples of an ideal gas, all at the same temperature, occupy identical containers with the same volume. the particle mass is proportional to the size of particles. the gas samples has the greatest pressure is in which has greater no. of moles.
The equation for an ideal gas given as :
P V = n RT
where,
P = pressure
V = volumes in L
T = temperature at K
n = moles
R = 0.082 L atm / mol K = gas constant
since volume and temperature are constant , then :
P = n
therefore greater the number of moles , greater will be the pressure.
Thus, The three samples of an ideal gas, all at the same temperature, occupy identical containers with the same volume. the mass of the particle is proportional to its size. the gas samples has the greatest pressure is in which has greater no. of moles.
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answer yes if the substance becomes part of the filtrate or answer no if the molecule does not become part of the filtrate
Yes, the substance becomes the part of filtrate. No, the molecule does not become part of the filtrate.
What is filtrate?The most common example is making tea. While preparing tea, a filter or a sieve is used to separate tea leaves from the water. Through the sieve pores, only water will pass. The liquid which has obtained after filtration is called the filtrate; in this case, water is the filtrate.
Which substance becomes the part of the filtrate?The substances that are normally found in the filtrate are plasma components (such as water, nutrients, dissolved gases, electrolytes, and metabolic wastes) excluding plasma proteins and blood cells.
Why molecule becomes the part of the filtrate?Proteins are large molecules that cannot pass the wall of capillaries during filtration, hence, this molecule is not normally part of the filtrate.
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the kb for a weak base is 1.00 x 10-9. what is the % ionization of a 2.00 m aqueous solution of the base?
The % ionization of a 2.00 m aqueous solution of the base is 0.0022%
What is pOH ?
It is a measure of the hydroxide ion (OH-) concentration of a solution. Therefore, it can be used as an indicator of the alkalinity of a substance and, in some cases, also as an indicator of electrical conductivity. pOH is the negative logarithm of hydroxide ion content and is given by the formula:
pOH = 14 - pH
OH = Kw /OH+
where Kw = self-ionization content of water.
Applying the logarithm on both sides, the more general form of the equation is: In relation to corrosion, pOH can be used as an indicator of electrolyte conductivity in galvanic cells. The conductivity of a solution depends on the concentration of ions that act as charge carriers. The higher the concentration of OH ions, the stronger the alkalinity, the higher the conductivity of the electrolyte, and the higher the rate of galvanic corrosion.
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which of the following statements is/are correct? 1. a diamagnetic substance is strongly attracted to a magnetic field. 2. substances that retain their magnetism after they are withdrawn from a magnetic field are called ferromagnetic. 3. most transition metals and all lanthanide metals are ferromagnetic
The following statements are correct 2 only.
A diamagnetic material is strongly attracted to a magnetic field. A material that retains its magnetism after being removed from a magnetic field is said to be ferromagnetic. Most transition metals and all lanthanide metals are ferromagnetic. Paramagnetic compounds are attracted to magnetic fields, whereas diamagnetic compounds are repelled by magnetic fields.
Paramagnetic compounds have unpaired electrons whereas in diamagnetic compounds all electrons have paired spins. They stick to ferromagnetic materials such as iron and ferrous objects such as steel. This includes everything from the steel body of your car to your refrigerator door. It is also attracted to nickel, cobalt, and other rare earth elements.
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a mixture of oxygen and carbon dioxide gases, at a total pressure of 689 mm hg, contains 1.58 grams of oxygen and 5.92 grams of carbon dioxide. what is the partial pressure of each gas in the mixture? po2
The partial pressure of each gas in the mixture is 291.04 mmHg and 393.22mmHg
Partial pressure is defined as if a container is filled with more than one gas and each gas exert pressure
Here given data is
Total pressure = 689 mm hg
Mass of oxygen = 1.58 grams
Mass of carbon dioxide = 5.92 grams
We have to find partial pressure of each gas in the mixture = ?
So number of mole of oxygen
Number of moles = mass/molar mass
Number of moles = 1.58 grams/15.999g/mol
Number of moles = 0.098 mol
Number of mole of carbon dioxide
Number of moles = mass/molar mass
Number of moles = 5.92 grams/44.01g/mol
Number of moles = 0.134 mol
Then partial pressure of oxygen
Total number of moles 0.098 mol + 0.134 mol = 0.232 mol
P(O₂) = [moles of oxygen / total moles] × total pressure
P(O₂) = 0.098 mol/0.232 mol × 689 mm hg
P(O₂) =291.04 mmHg
Partial pressure of carbon dioxide
P(O₂) = [moles of oxygen / total moles] × total pressure
P(O₂) = 0.134 mol/0.232 mol×689 mm hg
P(O₂) = 393.22mmHg
Partial pressure of each gas in the mixture is 291.04 mmHg and 393.22mmHg
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at constant temperature, a sample of helium at 760. torr in a closed container was compressed from 5.00 l to 3.00 l. what was the new pressure exerted by the helium on its container? at constant temperature, a sample of helium at 760. torr in a closed container was compressed from 5.00 l to 3.00 l. what was the new pressure exerted by the helium on its container? 1 270 torr 800. torr 3 800 torr 2 280 torr 15.0 torr
At this point, helium is exerting 1270 torr of pressure against its container.
What is Boyle's Law?Boyle's Law, a cornerstone of chemistry, describes the behavior of a gas sustained at a constant temperature. Robert A. Boyle discovered this law in 1662: at a certain temperature, the volume of a gas is inversely proportional to the pressure it exerts. To put it another way, if a gas is driven into a closed place, it will condense to fit the area but raise the pressure on the container.
Boyle's law, which is arguably a clearer way to put it, is the relationship between pressure and volume. Mathematically, Boyle's law can be written as pV=k, where p stands for the pressure, volume, and mass of the gas and k is a constant.
The solution is straightforward when temperature and moles are constant,
P₁V₁ = P₂V₂
Given,
P₁ = 760 torr
P₂ = ?
V₁ = 5.00 I
V₂ = 3.00 I
(760)(5.00) = (3.00)(P₂),
P2 = 1270 torr.
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a piece of wood is measured and 1/4 of its 14c has decayed into 14n. approximately how old is it? (note: the half-life of 14c is 5,730 years.) a. 5,730 years b. 2,865 years c. 11, 460 years d. 50,000 years
A piece of wood is measured and 1/4 of its 14c has decayed into 14n. The half-life of 14c is 5,730 years. Approximately 5,730 years old is it.
What is Half-Life ?The half-life is the time required for a quantity to fall to half of its starting value. The expression is commonly used in nuclear physics to describe how quickly unstable atoms decay radioactively or how long stable atoms remain. The term can also be used more generally to refer to any type of exponential decay.
A measurement of a piece of wood reveals that one-fourth of its 14c has converted to 14n.
With a half-life of 5700 30 years, radiocarbon (14C) is particularly useful for dating in archaeology. The Gamow-Teller ß-decay, an uncommon impediment to the beta decay of 14C to 14N, causes this half-life to be short.
Radiocarbon dating, also referred to as carbon-14 dating, is a method of radiometric dating. It uses the naturally occurring radioisotope carbon-14 (14C) to estimate the age of items containing carbon up to a maximum of 58,000–62,000 years. Carbon has two stable, nonradioactive isotopes: carbon-12 and carbon-13. On Earth, trace amounts of the unstable radioactive carbon-14 (14C) are also present. Carbon-14 has an extremely short half-life of 5,730 years due to radioactive decay to nitrogen-14, which means that within this time, the percentage of carbon-14 in a sample will have dropped by 50%. Carbon-14 would vanish from Earth's atmosphere in less than a million years if it weren't for cosmic rays that are continually pelting the stratosphere and interacting with nitrogen molecules (N2) and single nitrogen atoms.
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a chemist measured the amount of beryllium sulfide produced during an experiment. she finds that of beryllium sulfide is produced. calculate the number of moles of beryllium sulfide produced.
The moles of BeS produced is 0.20231 mol.
molecular weight of Be = 9.01 g/mol
molecular weight of S = 32.065 g/mol
Thus, the molecular weight of beryllium sulfide is equal to:
molecular weight of BeS = 9.01 + 32.065 = 41.075 g/mol
The number of moles will be equal to: 8.31*(1/41.075) i.e., 0.20231 mol.
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which is true about the two isotopes
PLEASE HELP
The statement that is true about the two isotopes is that carbon-12 has fewer neutrons (option D).
What are isotopes?Isotopes are any of two or more forms of an element where the atoms have the same number of protons, but a different number of neutrons within their nuclei.
Based on the above explanation, this means that isotopes have the same atomic number but a different mass number.
According to this question, two isotopes were given as follows:
Carbon -12Carbon -14Carbon-12 and Carbon-14 both have the same number of protons of 6, however, they contain different number of neutrons. Carbon-12 possesses 6 neutrons while Carbon-14 possesses 8 neutrons.
Therefore, it can be said that Carbon-14 has more neutrons than Carbon-12.
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Is boiling or evaporation of water more common on earth
An experiment was carried out to find
out how the mass of potato chips
changed when they were left in sugar
solutions of different strengths. The
table of results is shown below. Would
you expect the value of X to be more or
less than 2.5g?
Answer:
the answer would be more than 2.5g
Explanation: