The amount of reactant and product that changes per unit of time is the rate expression for the reaction. The change in reactant and product concentration over time is depicted by the rate expression.
Although it is unnecessarily simplified, the rate expression (3.35) has been found to be extremely useful in many situations. Let's define a basic reaction so that we can continue our conversation. A reaction is considered to be elementary if the reactants (or reacting molecules) always respond stoichiometrically. For instance, in an elementary reaction, A and B can spontaneously transform into C when they come into contact without needing to do any further action. Therefore, idealised reactions or reaction stages are considered elementary reactions.
The rate of disappearance of ozone is the rate of difference of O3 is divided by 2.
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what causes the electron groups around a central atom to similarly spread out as much as possible?
Electron groups around a central atom tend to spread out as much as possible because of the electron-electron repulsion principle, also known as the Pauli exclusion principle. According to this principle, electrons in an atom tend to occupy different energy levels, or orbitals, to minimize the repulsive interactions between them.
When electron groups are spread out as much as possible, the energy of the system is minimized, and the atoms are more stable. This is because the repulsive forces between the electrons are reduced when they are farther apart. This is known as the octet rule, which states that atoms tend to gain or lose electrons in such a way as to have eight valence electrons in their outermost shell, which is the most stable configuration.
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an aerosol can contains 400. ml of compressed gas at 5.20 atm. when all of the gas is sprayed into a large plastic bag, the bag inflates to a volume of 2.14 l. what is the pressure of gas in the plastic bag? assume a constant temperature.
The pressure in the plastic bag is equal to the initial pressure of the gas in the aerosol can, which is 5.20 atm.
What is aerosol?Aerosol is a type of suspension of fine particles or liquid droplets in air or another gas. Aerosols are typically created when a material is dispensed from a pressurized container and dispersed in the form of a spray, mist, foam, or foam. Examples of aerosols include dust, smoke, smog, fog, and spray paint. Aerosols can also be generated naturally, such as the spraying of saltwater droplets from the ocean’s surface. Aerosols are important for many scientific and industrial applications, such as in medicine, agriculture, and manufacturing. They are also essential in the production of consumer products such as cosmetics, paints, and cleaners. Aerosols also play a key role in the global climate system, as they affect the amount of sunlight that reaches the Earth’s surface and the formation of clouds. Aerosols are also used in research and environmental monitoring, as they can provide information about air quality and climate change.
This is because, as the gas is sprayed out of the can into the plastic bag, it expands and its pressure decreases. However, the pressure of the gas in the plastic bag will stay the same as the pressure of the gas in the aerosol can, so long as the temperature of the gas stays constant. This is because, according to the ideal gas law, the pressure of a gas is directly proportional to its temperature. Therefore, the pressure of the gas in the plastic bag will be 5.20 atm.
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chemical analysis of an organic compound found the following composition: 40.0% c, 53.5% o, and 6.7% h. if the molar mass is 180.2 g/mol, how many empirical formula units are there in the molecular formula?
Empirical formula units is 2 and the molecular formula is CxHyOz.
Molar mass-The molar mass of a chemical compound is determined by dividing its mass by the quantity of that compound, expressed as the number of moles in the sample, measured in moles. The molar mass of a substance is a bulk attribute rather than a molecular one.Calculate the molar mass of a substance by adding the molar masses of its constituent atoms.
There are 40.0 in 100 g of the unknown.
40.0⋅g/12.011⋅g⋅mol−1C
6.7⋅g/1.00794⋅g⋅mol−1 H and
53.5⋅g/16.00gmol−1
We divide by to get C : H : O.
=3.33:6.65:3.34
. We get an empirical formula of C H 2 O by dividing each elemental ratio by the LOWEST number, which is close enough to WHOLE numbers.
Now the molecular formula is always a multiple of the empirical formula; i.e.
(EF)n=MF.
So 60.0⋅g.mol−1=n×(12.011+2×1.00794+16.00)g⋅mol−1.
Clearly n=2, and the molecular formula is×(CH2O) =CxHyOz.
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how much energy is required to take a 15.0-g sample of ice at −15.0 °c to liquid water at 45.0 °c?
The energy is required to take a 15.0-g sample of ice at −15.0 °c to liquid water at 45.0 °c is 8.30kj.
What is enthalpy ?The term enthalpy is defined as the sum of the system's internal energy and the product of its pressure and volume.
Ice warming Cs = 2.09 J/g∙°C
Enthalpy of fusion ∆H = 6.02 kJ/mol
Liquid water warming Cs = 4.18 J/g∙°C
Enthalpy of vaporization ∆H = 40.7 kJ/mol
Steam Warming Cs = 2.01 J/g∙°C
Step 1: Warm ice from −15.0°C to 0°C.
q1 = 470.25 joule
Step 2: Melt ice.
q2 = 5016.66
Step 3: Warm liquid water from 0°C to 45.0°C.
q3 = 2821.5 joule
The total energy is the sum of the energy of each step.
q = q1 + q2 + q3
= 470.25 + 5016.66 + 2821.5
= 8.30kj
Thus, energy is required to take a 15.0-g sample of ice at −15.0 °c to liquid water at 45.0 °c is 8.30kj.
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Why is the atomic mass of an element not a whole number?
It is based on the abundance of each isotope for an element.
Averages are rarely whole numbers.
It is equal to the number of protons and neutrons in the nucleus of the atom.
It is the atomic mass of the most common isotope for that element.
Answer: The atomic mass of an element is not a whole number because it is based on the abundance of each isotope for that element.
Explanation: The atomic mass of an element is not a whole number because it is based on the abundance of each isotope for that element. The atomic mass of an element is a weighted average of the atomic masses of all of its naturally occurring isotopes, taking into account the relative abundance of each isotope. For example, if an element has two isotopes, one with an atomic mass of 10 and the other with an atomic mass of 12, and the isotope with an atomic mass of 12 is more abundant, the atomic mass of the element will be closer to 12 than to 10. This means that the atomic mass of an element is usually not a whole number because it is an average of several different atomic masses.
when 1.9 mol of copper (ii) hydroxide decomposes to form copper (ii) oxide and water, how many moles of water are formed
When 1.9 mol of copper (ii) hydroxide decomposes to form copper (ii) oxide and water, moles of water that formed are 1. 9 moles
The moles that formed can be calculated as follows:
first we should write the balanced reaction
Cu(OH)₂ → CuO + H₂O
The following numbers of moles of each component are involved in the reaction according to reaction stoichiometry, which describes the relationship between the amounts of reagents and products in a chemical reaction, with unitary method we can calculate the moles of H₂O:
Cu(OH)₂: 1 mole
CuO: 1 mole
H₂O: 1 mole
so, 1 mole of Cu(OH)₂ produce 1 mole of H₂O
If 1.9 mol of copper (ii) hydroxide decomposes to form copper (ii) oxide and water so the moles of H₂O is
Moles H₂O = 1/1 x mole of Cu(OH)₂ = 1/1 x 1.9 mol = 1.9 moles
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c. what would happen if the solutions were switch so that the first incubation was in the ph 8 solution and he second one was in the ph4 solution? explain your answer.
Nothing would happen if the solutions were switch so that the first incubation was in the pH 8 solution and he second one was in the pH 4 solution.
The H+ gradient would be in the wrong direction, ATP synthase would not work.
pH is a measure of how acidic/basic water is. The range goes from 0 to 14, with 7 being neutral. pHs of less than 7 indicate acidity, whereas a pH of greater than 7 indicates a base. pH is really a measure of the relative amount of free hydrogen and hydroxyl ions in the water.
pH is an important quantity that reflects the chemical conditions of a solution. The pH can control the availability of nutrients, biological functions, microbial activity, and the behavior of chemicals.
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calculate the equilibrium concentrations of reactant and products when 0.340 moles of are introduced into a 1.00 l vessel at 350. k.
Equilibrium concentrations of reactant and products
CH2Cl2=0.043
CH4=0.136
CCl4=0.136
When both the reactants and products are at concentrations that do not change over time, they are said to be in chemical equilibrium. In this state, the forward reaction rate is equal to the reverse reaction rate.
Explanation:
2CH2Cl2(g) =CH4(g) + CCl4(g)
Initial 0.315mol/L 0 0
Change -2x +x +x
Equib 0.315-2x x, x
Kc = [CH4][CCl4] / [CH2C2] (^2)
10.5 = x(^2) / (0.315 - 2x)^2
Work out the quadratic for x
10.5(4x^2 +0.099225 -1.26x) =x^2
3.90476x^2 -1.26x +0.099225=0
solve for x
discard the negative, can't have less than nothing.
x=0.136
0.315-2x = 0.315-2*0.136=0.043
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how many bonded atoms in carbon monoxide? how many lone pairs in carbon monoxide?
Answer:
there are 3 bonded atoms in carbon monoxide and a total of 6 electrons
Answer: There are a total of two bonded atoms in carbon monoxide: one carbon atom and one oxygen atom. There are no lone pairs in carbon monoxide.
Explanation: Carbon monoxide, or CO, is a chemical compound made up of one carbon atom bonded to one oxygen atom. The molecule has a linear shape, with the carbon atom at one end and the oxygen atom at the other end. There are a total of two bonded atoms in carbon monoxide: one carbon atom and one oxygen atom.
In terms of lone pairs, or non-bonding electrons, carbon monoxide has none. Lone pairs are pairs of electrons that are not involved in bonding, and they are typically found in the outermost electron shell of an atom. In carbon monoxide, all of the electrons are either bonded to the other atom in the molecule or are involved in bonding to that atom. Therefore, there are no lone pairs in carbon monoxide.
given the densities of uranium (19.05 g/cm3 ) and deuterium oxide (1.11 g/cm3 ), what is the edge length of the cube of uranium?
A small cube of solid uranium metal, measuring about two inches on each side and weighing less than 2.5 kilos, has been housed at the Pacific Northwest National Laboratory (PNNL) for many years.
A Heisenberg cube is what?
More than 600 "Heisenberg cubes," named after Werner Heisenberg, one of the German physicists who developed them, were taken from a top-secret underground laboratory at the end of World War II and brought to the United States. These cubes were essential to the Nazis' plans to build both a nuclear reactor and an atomic bomb.
Is uranium available for purchase?
However, the truth is that you may purchase uranium ore without a special permit from websites like Amazon or Ebay. The most prevalent isotope of the element, uranium-238, is only purchased for research purposes.
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when an aromatic ring is deactivated, what happens to the rate of an electrophilic aromatic substitution reaction?
The molecular dipole moments of the substituents, which are used to quantify their effect on electron donating or withdrawing, may be associated with the deactivation of the aromatic ring toward electrophilic substitution.
A substituted ring with an activating group undergoes the EAS reaction more quickly than benzene. A substituted ring with a deactivated group, on the other hand, moves more slowly than benzene. By using resonance or inductive electron donation, activating groups accelerate the EAS reaction. The reaction rate with regard to benzene is increased or decreased by the group(s) linked to the aromatic ring. the new substituent's entrance position. Activating and deactivating groups, respectively, affect the rate of the electrophilic aromatic substitution process with regard to benzene..
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the boiling point of liquid nitrogen is 77.0 k. what is the corresponding temperature in the fahrenheit and celsius scales?
If boiling point of liquid nitrogen is 77.0K then the temperature in Celsius scale is -196°C and in Fahrenheit scale is -321°F.
Relation between Celsius and Kelvin:
Both Celsius and Kelvin are measures of temperature. 0 Celsius is the freezing point of water and 100 Celsius is the boiling point. Whereas Kelvin is a measure of the internal energy of a material. 0K is -273.15°C.
the boiling point of liquid nitrogen is 77.0 k.
K = 273+C
77= 273+C
C= -196°C
Relation between Celsius and Fahrenheit:
Fahrenheit temperature scale, scale based on 32° for the freezing point of water and 212° for the boiling point of water, the interval between the two being divided into 180 equal parts. The Fahrenheit temperature scale is used in the United States; the Celsius, or centigrade, scale is employed in most other countries and for scientific purposes worldwide.
C/5 = (F-32)/9
-196/5 = (F-32)/9
F= -320.8=-321°F
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The table given below shows number of grams of five different solids dissolving in 100 g of the solvents : water, alcohol and chloroform (all at 20âC).
SolventWaterAlcoholChloroformSalt36.00.00.0Sugar204.00.00.0Iodine0.620.03.0Chalk0.00.00.0Urea100.016.00.0
(a) Which solid dissolves best in water at 20âC ? (b) Which solid is maximum soluble in alcohol ?
(c ) Which solid is insoluble in all the three solvents ?
A) Sugar B) Iodine C) Iodine number of grams of different solids in 100 g of the solvents - water, alcohol and chloroform
The term "solubility" describes how well a material (or "solute") dissolves in a particular solvent to form a solution.
A solute must have a similar form of intermolecular attraction to a solvent for it to dissolve in it.At 20 degree Celsius, sugar dissolves most easily in water. The slightly polar character of the oxygen-hydrogen bonds in sugar attracts the charged regions of the compound, which leads to its dissolution and the formation of a clear solution.Alcohol has a very high solubility for iodine. Iodine is a non-polar molecule, which makes it difficult to dissolve in water. Iodine dissolves readily in ethanol because it is less polar than water. Even the non-polar solvent chloroform can dissolve iodine.The iodide form of iodine can also dissolve in water. Iodine molecules and iodine ions combine to generate triiodide, a polar compound that dissolves in water.To learn more about solvents Please click on the given link:
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Atoms with a strong attraction for electrons they share with another atom exhibit.a. Trueb. False
Atoms with a strong attraction for electrons they share with another atom exhibit a strong covalent bond. This is true.
In a covalent bond, atoms share electrons in order to achieve a stable, lower-energy configuration. The strength of the covalent bond depends on the electronegativity of the atoms involved and the distance between them. Atoms with high electronegativities, such as oxygen and fluorine, tend to have a strong attraction for the electrons they share with another atom, resulting in a strong covalent bond.
In general, covalent bonds are relatively strong compared to other types of chemical bonds, such as ionic bonds or hydrogen bonds. They are also generally more directional, meaning that they are more directional and tend to be more directional in nature, which gives rise to the formation of specific geometries in molecules.
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Atoms with a strong attraction for electrons they share with another atom exhibit a strong covalent bond. This is true.
In a covalent bond, atoms share electrons in order to achieve a stable, lower-energy configuration. The strength of the covalent bond depends on the electronegativity of the atoms involved and the distance between them. Atoms with high electronegativities, such as oxygen and fluorine, tend to have a strong attraction for the electrons they share with another atom, resulting in a strong covalent bond.
In general, covalent bonds are relatively strong compared to other types of chemical bonds, such as ionic bonds or hydrogen bonds. They are also generally more directional, meaning that they are more directional and tend to be more directional in nature, which gives rise to the formation of specific geometries in molecules.
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how many grams of pbbr2 will precipitate when excess solution is added to 76.0 ml of 0.625 m solution?
The grams of PbBr₂ formed when excess solution is added to 76.0 ml of 0.625 m solution of Pb(NO₃)₂ are 17.4325.
The balanced chemical equation for the process is,
Pb(NO₃)₂(aq) + BaBr₂(aq) → PbBr₂(s) + Ba(NO₃)₂(aq)
So, from the reaction, we can see that when one mole of Pb(NO₃)₂ reacts, one mole of PbBr₂ precipitate is formed.
It is given that 76ml of 0.625 M Pb(NO₃)₂ is reacting,
We know,
Moles = Molarity x volume (in liters)
Now, putting the value to find the moles of Pb(NO₃)₂ soluton,
Moles of Pb(NO₃)₂ = 76 x 0.625/1000
Moles of Pb(NO₃)₂ = 0.0475 moles.
So, the mole of the precipitate formed is 0.0475 Moles.
Now, we also know,
Moles = Formed mass/Molar mass.
Molar mass of PbBr₂ = 367 g/mol.
Moles of PbBr₂ = 0.0475 moles.
Formed mass of PbBr₂ = 367 x 0.0475
Formed mass of PbBr₂ = 17.4325 Grams.
So, 17.4325 Grams of PbBr₂ is formed.
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compound contains platinum(ii), with two ammonia molecules per platinum. the compound also contains two moles of chloride (cl-) per mole of platinum. treatment of the compound with silver nitrate does not result in the precipitation of silver chloride. the formula of the compound is
The compound treatment on with silver nitrate does not result in the precipitation of silver chloride. the formula of the compound is [Pt(NH₃)₂Cl₂].
The contains the platinum(II) and the two ammonia molecules per the platinum. the compound contains the chloride ions per mole of the platinum. the compound does not give precipitate of silver chloride on treating with the silver nitrate is [Pt(NH₃)₂Cl₂].
The compound will react with the silver nitrate if the Cl is out of the coordination sphere. the NH₃ is the monodentate ligand and Cl is also the monodentate ligand. the total ligand is 4 coordinated ligand. the oxidation state of Pt is +2
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a 35.5 ml sample of a concentrated solution of sodium hydroxide (4.25 m) is diluted to a concentration of 2.55 m solution of sodium hydroxide. what is the final volume?
In industrial, sodium hydroxide is a well-liked strong base. In order to make sodium salts and detergents, regulate pH levels, and synthesise organic compounds, sodium hydroxide is employed.
Since aqueous solutions are more convenient and affordable to handle, they are typically handled in bulk. When it is preferable to make a mixture more alkaline or to neutralise acids, sodium hydroxide is frequently utilised. For instance, sodium hydroxide is a drilling mud additive that is used in the petroleum sector to raise the viscosity and alkalinity of bentonite mud systems as well as to neutralize any acid gases that may be discovered in the geological formation as drilling advances. Salt also has a use.
M1V1 = M2V2
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To create the hybridized orbitals on the s atom, the blanks and blankp valence orbitals hybridize for a total of blank orbitals participating in hybridization
In order to create sets of comparable orbitals that are correctly orientated to form bonds, the localised valence bonding theory employs a mathematical process known as hybridization.
hybridization combines atomic orbitals that are same in energy but not equal. Because these new combinations are made by combining (hybridising) two or more atomic orbitals from the same atom, they are known as hybrid atomic orbitals. The 2s orbital of beryllium and any one of the three degenerate 2p orbitals can be combined to create two equivalent orbitals in BeH2. Using the difference and total of the Be 2s and 2pz atomic orbitals.
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write the ka2 reaction of sulfuric acid (h2so4) and the kb2 reaction of disodium oxalate (na2c2o4) and find their numerical values.
The rate constant for H2SO4 is 1.02 x 10-2 and the rate constant for Na2C2O4 is 5.3 X 10-5.
Ka2 is the second rate dissociation constant.
Kb2 is the second base dissociation constant.
H2SO4 is a di-basic acid. Whose Step wise dissociation is given below :
H2SO4 = H++ HSO4- ---(1)
Where the rate constant is ka1 .
Now Again HSO4- will dissociates in the following way :
HSO4- = H+ + SO42- -----(2)
Where the rate constant is Ka2 .
So , the equation for Ka2 is :
Ka2=[H+][SO42-]/[HSO4-]
The rate constant is 1.02 x 10-2.
Similarly step-wise dissociation of Disodium oxalate (Na2C2O4) is
Na2C2O4 = NaC2O4- + Na+ -----(1)
Second dissociation equation is
NaC2O4- = C2O42- + Na+ ----(2)
So , the rate constant for the second equation is:
Ka2=[Na+][C2O42-]/[NaC2O4-]
The rate constant is 5.3 X 10-5.
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Complete the following nuclear equation:
The nuclear equation shown is completed as follows:
²¹⁴₈₂Pb ---> ⁰₋₁e + ²¹⁴₈₃Bi
The correct option is B.
What is a nuclear equation?A nuclear equation is an equation that represents or shows a nuclear reaction.
particles found nuclear reaction is a reaction in which reaction changes occur in the atomic particles found within the nucleus of a na atom.
There are two types of nuclear reactions;
nuclear fusion - the fusion of the atoms of two sammlerf nuclei to form larger nuclei
nuclear fission - the splitting of the nucleus of a large atom to produce two or smaller atoms.
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carbon disulfide and chlorine react to yield carbon tetrachloride and disulfur dichloride. when the equation for this reaction is balanced, what is the coefficient in front of chlorine?
The balanced equation for this reaction is
CCl2S2 + 4Cl2 -> CCl4 + S2Cl2
The coefficient in front of chlorine is 4. This means that 4 moles of chlorine are required to react with 1 mole of carbon disulfide. This reaction follows the Law of Conservation of Mass, meaning that matter is neither created nor destroyed during a chemical reaction.
Chlorine is added to the reaction to ensure that the same amount of chlorine atoms are present on both sides of the equation. The chlorine atoms are necessary to convert the carbon disulfide into carbon tetrachloride and disulfur dichloride.
The chlorine atoms act as an oxidizing agent, breaking down the molecules of carbon disulfide and rearranging them into new compounds.
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A pound of plain M&M candies contains 96 g fat, 320 g carbohydrate, and 21 g protein. What is the fuel value in kJ in a 42-g (about 1.5 oz) serving? How many Calories does it provide?
The fuel value of plain M&M candies in kJ in a 42-g (about 1.5 oz) serving (approximately 1.5 oz) is 874.44 kJ
The calories does it provide = 208.99 Cal
In a pound of candy, there are:
96 g fat
320 g carbohydrate, and
21 g protein.
The serving size is m = 42 gr
To determine the worth of a single serving, we are asked.
To do this, we must first determine the candy's fuel worth per pound:
Fat = 96 g x 38 kJ/g
= 3648 kJ
Carbohydrate = 320 g x 17 kJ/g
= 5440 kJ
Protein = 21 g x 17 kJ/g
= 357 kJ
The sum of the fuel values for fat, carbs, and protein is the total fuel value per pound.
= 3648 kJ + 5440 kJ + 357 kJ
= 9445 kJ
Calculate the total fuel value per gram after determining the total fuel value per pound.
= 9445 kJ x (1 lb/ 453.6)
= 20.82 kJ/g
Next, determine how much fuel is in one serving:
This is expressed as the mass multiplied by the total fuel value per gram. Which is:
= 20.82 x 42 gr
= 874.44 kJ
So, the calories does it provide:
= 874.44 kJ/4.184
= 208.99 Cal
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what is the maximum velocity of an enzymatic reaction given that the initial velocity is 500 umolml-1s-1 and the km is 25 m at a substrate concentration of 75 m.
An enzymatic reaction can move at a maximum speed of 666.67 umol-1s-1.
The Michaelis-Menten equation, developed by Briggs and Haldane, best captures the enzyme equation by modeling the rate of enzymatic reactions by coupling the rate of product creation to the concentration of substrate, as shown below.
[tex]v_{i} = \frac{v_{max} * [S]}{k_{m}+ [S] }[/tex]
Where v denotes the reaction’s speed, Vmax denotes the system’s maximum rate of growth, [S] denotes the substrate’s concentration and [tex]k_{m}[/tex] denotes the Michaelis constant.
[tex]500= \frac{v_{max}*75 }{25+75}[/tex]
[tex]500= \frac{v_{max} * 75}{100}[/tex]
[tex]500*100= v_{max} *75[/tex]
[tex]\frac{50000}{75} = v_{max}[/tex]
[tex]v_{max} = 666.67[/tex]
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a compound has the formula x3y. for every 15 x atoms present in this compound, how many y atoms are there?
There are 45 atoms.
Each of the 3 oxygen atoms gains 2 electrons from 2 Al atoms, and each Al atom donates 3 electrons to 3 oxygen atoms. In this process each Al atom becomes an Al3+ ion and an oxygen atom. O2 ion got two electrons. Or the formula is Al2O3.
The bonding pattern of a hybridized carbon atom consists of two single bonds to two atoms and one double bond to the third atom, with a total of eight valence electrons around the bonded carbon atom. give. Atoms with all single bonds are sp3 hybridized. The best examples are alkanes. All carbon atoms in alkanes are sp3 hybridized with tetrahedral geometry.
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Write word equations for any reaction that takes place in each of the following. If you would expect no reaction to occur.
say so.
a) Calcium is added to water.
b) Silver is added to dilute hydrochloric acid.
c) Lead oxide is heated with magnesium.
d) Calcium is heated in air.
e) Aluminium is heated with lead oxide.
f) Potassium is added to water.
g)Silver is added to copper sulfate.
h) Iron is added to sulfuric acid.
i) Magnesium is added to nitric acid.
i) Calcium is added to hydrochloric acid.
Answer:
a) Ca+ H2O = Ca(OH)2 + H2
A solution containing which one of the following pairs of substances will be a buffer solution: A) KBr, HBr B)CsF,HF C) NaI, HI D) RbCl, HCl E) None of these
A solution that contains the chemical compounds CsF and HF will serve as a buffer.
When a weak acid, as well as its conjugate base or weak base as well as its conjugate acid, are combined, buffer solutions are created that serve to maintain the solution's pH level even when a little amount of a strong acid is added.
Except for CsF and HF, all of the aforementioned pairings will create a buffer solution since CsF is a weak base whereas F is the organic compound with the formula of HF acid.
A buffer is a substance that can withstand a pH shift when acidic or basic substances are added. It can maintain the solution's pH by neutralizing modest quantities of additional acid or base.
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the half-life of the radium isotope ra-226 is approximately 1,599 years. what percent of a given amount remains after 800 years? round your answer to two decimal places.
The half-life of the radium isotope ra-226 is approximately 1,599 years. After 800 years, the remaining amount of the isotope is 70.71% of its initial quantity.
The decay formula is given by:
N(t) = No . (1/2)^(t/T)
Where:
N(t) = remaining quantity of the substance at time t
No = initial quantity
t = elapsed time
T = half-life
In the given problem:
t = 800 years
T = 1599 years
Therefore,
N(t) = No . (1/2)^(800/1599)
N(t) = 0.7071 No
N(t)/No = 0.7071 = 70.71%
Hence, the remaining amount of the isotope is 70.71%
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why wasn't wegner's theory of continental drift accepted during his lifetime?
Answer:
Wegener's theory was primarily rejected since he offered no explanation for how the continents might move.
Explanation:
The theory also went against many ideas widely accepted in the community.
what is the ph of a solution made by dissolving 1.9 g of k2co3 and 7.9 g of khco3 in 500. ml of water? use the acid-ba
10.36 is the ph of a solution made by dissolving 1.9 g of k2co3 and 7.9 g of khco3 in 500. ml of water
Mass of K2CO3 = 1.9 g
Moles of K2CO3 = ( Mass / Molar mass ) = ( 1.9 g / 138.205 g / mol ) = 0.031 mol
Mass of KHCO3 = 7.9 g
Moles of KHCO3 = ( Mass / Molar mass ) = ( 7.9 g / 100.115 g / mol ) = 0.0789 mol
Volume of solution = 500 mL = 0.5 L
[ HCO3- ] = 0.078 mol / 0.5 L = 0.156 M
[ CO32-] = 0.031 mol / 0.5 L = 0.062 M
Ka for HCO3- = 4.7 x 10 -11
pKa = 10.32
pH = pKa + log [CO32-] / [HCO3-]
pH = 10.32 + log ( 0.062/0.156 ) = 10.32 - 0.4 = 10.31
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a reaction requires 25.0 g of sodium chloride. how many grams of a 10.0% solution would provide this amount of solute?
This amount of solute would be provided by 2.5 grams of a 10.0% solution.
% (w/v) formula:
[tex]% (\frac{w}{v}) = \frac{grams solute}{mL of solution} *100[/tex][tex](\frac{w}{v})[/tex]%[tex]= \frac{grams solute}{mLof solution} *100[/tex]
[tex]10[/tex]% [tex]NACl(\frac{g}{mL})= \frac{grams NaCl}{25mL} *100[/tex]
To calculate the mass in grams of NaCl required to create a 10% (w/v) NaCl solution, divide 10% by 100 and multiply the result by 25.
[tex]0.1*25 = 2.5g[/tex]
Salt, commonly known as sodium chloride (NaCl), is a substance that our body needs in order to absorb and transport nutrients, regulate blood pressure, maintain fluid balance, convey nerve messages, and contract and relax muscles.
Salt, or sodium chloride, accounts for about 75 to 90 percent of the sodium we consume. Our bodies require sodium, an essential mineral found in salt, for processes including blood pressure regulation and nutrition absorption. In addition to using salt to season food, clean household goods, and treat some medical conditions. Greater health issues like high blood pressure, heart disease, and kidney disease can be brought on by consuming too much salt. Your chance of developing those illnesses can be decreased by consuming less salt and consuming more potassium.
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