The equilibrium constant at 615 K for each of the following reactions-
A.) 4.622 * 10^(-5)
B.) 5.545
What does chemistry's equilibrium constant mean?The ratio of reactant to product amounts that is used to predict chemical behavior is the definition of the equilibrium constant for a chemical process. In a state of equilibrium, the forward reaction rate equals the backward reaction rate.
How would you define equilibrium in the simplest terms?A static (like a body acted upon by forces whose resultant is zero) or dynamic (like a reversible chemical reaction where the velocities in both directions are equal) state of balance between opposing forces or actions: a state of intellectual or emotional equilibrium.
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find the formula of an oxide of carbon in which the ratio by mass of oxygen to carbon is 2.00:1.00.
Since there are three oxygen atoms and a total of 16 times as much carbon as there are carbon atoms, the formula 03C2 will result in a gigantic oxygen to carbon ratio of 2 to 1.
Describe carbon.Carbon is an element with symbol 'C' and atomic number 6 (from the Latin carbo, meaning "coal"). It has a tetravalent atom, which means that four of its electrons can be used to create covalent chemical bonds. It is nonmetallic. The periodic table's group 14 includes it. The crust of the Earth contains 0.025 percent carbon.
Why does carbon matter so much?Without carbon, life on the planet would not be conceivable. This is partly because carbon can easily make bonds to other atoms, allowing biomolecules like RNA and DNA which are crucial for the development and replication that characterizes life, to take on a variety of shapes and functions.
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After a candle is blown out, the wax of the candle decreases in temperature. What happens to the molecules of the wax when the temperature of the wax decreases?
Answer:The energy of the molecules of the wax decreases.
Explanation:
C25H52 + 38 O2 → 25 CO2 + 26 H2O
Explain how and why most of Earth’s precipitation comes from oceans.
The most common types of precipitation are rain, hail, and snow.
What kind of precipitation is in the ocean?Rain is precipitation that falls to the top of the Earth as water droplets. Raindrops form around microscopic cloud moisture nuclei, The ocean plays a key role in this essential cycle of water. The ocean holds 97% of the total water on the planet; 78% of global precipitation happens over the ocean
Precipitation forms in the clouds when water vapor precipitation into bigger and bigger droplets of water. When the drops are heavy sufficient, they fall to the Earth. If a cloud is colder, like it would be at a higher height, the water droplets may freeze to form ice.
So we can conclude that The main forms of precipitation involving drizzle, are rain, sleet, snow, graupel, and hail.
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rank the following molecules by their increasing vapor pressure. molecule a: a small, nonpolar hydrocarbon molecule b: a small, polar molecule with an h-n bond molecule c: a salt molecule d: a small, polar molecule 1
C < B < D < A, For the weakest IMFs, the vapor pressure will be at its maximum. Small, nonpolar hydrocarbon molecule A = forces of dispersion, Molecule B is a tiny, polar molecule containing hydrogen bonds between its hydrogen atoms. ion-ion = a salt in molecule C. Small, polar molecule Molecule D: dipole-dipole
Why is vapor pressure significant and what does it mean?The pressure at which a liquid and its vapour are in equilibrium at a particular temperature is known as the vapour pressure. It is believed that the vapour is "pushing" against the atmosphere.
What succinct sentences best explain vapor pressure?Vapor pressure is the force that a gas in thermal equilibrium with a solid or liquid in a closed container produces.
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what substance is often referred to as mother nature's best cleaning agent and can be heated up and used to wash your knives?
The substance that is often referred to as mother nature's best cleaning agent and can be heated up and used to wash your knives is vinegar.
What is vinegar?Vinegar is a flavoring-free aqueous solution of acetic acid and trace chemicals. Vinegar normally has an acetic acid content of 5-8% by volume.
It can be used to remove stains, cut through filth, and even in the garden. Pouring vinegar down the drain is both safe and useful. It works as a natural cleaning agent, removing obstructions and dangerous germs that create odors.
Therefore, Vinegar is often considered to be nature's best cleaning agent because it can be heated and used to clean your blades.
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Construct the molecular orbital diagram for N2 and then identify the bond order Bond order0.5 O 1.5 O 2.5 2s 2s Click within the blue boxes to add electrons.
This creates a total of six electrons in the bonding molecular orbitals, giving the bond order of 2.5.
What is molecular?Molecular is the level of organization that deals with atoms and molecules. At this level, we are looking at the chemical structure of matter. Molecules are formed when atoms of different elements bond together to form a single unit.
The molecular orbital diagram for N2 consists of two valence orbitals, a 2s orbital and a 2p orbital. Each atom contributes one electron to the 2s orbital and three electrons to the 2p orbital. The electrons in the 2s orbital are paired, while the electrons in the 2p orbital are unpaired.
The molecular orbital diagram for N2 is as follows:
2s orbital:
e- ↑↓
2p orbital:
e- ↑ ↑ ↑
The bond order of N2 is 2.5, which indicates that it is a strong triple bond. This is because the 2s and 2p orbitals overlap to form three bonding molecular orbitals, each containing two electrons. This creates a total of six electrons in the bonding molecular orbitals, giving the bond order of 2.5.
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determine the ph of a 0.188 m nh3 solution at 25°c. the kb of nh3 is 1.76 × 10-5.
Answer A. 5.480 B. 2.740 C. 8.520 D. 11.260 E. 12.656
pH is 11.26 of a 0.188 m NH₃ solution at 25°c and the kb of nh3 is 1.76 × 10⁻⁵.
When NH₃ is dissolved in water, it will dissociates partially producing NH⁴⁺ ions and OH⁻ ions. Equation will be:
NH₃ + H₂O → NH₄⁺ + OH⁻
We using the Kb expression to determine the [OH-] concentration,
Kb = [NH⁴⁺] [OH⁻] /* [NH₃]
We can write NH₄⁺ as OH⁻ since they are in equal ratio.
(1.76*10^-5) = [OH-]² / 0.188
[OH-]² = 3.3088*10^-6
[OH-] = 1.819*10^-3
Therefore, we calculate for H+ concentration as follows:
[H⁺] [OH⁻] = 10^-14
[H⁺] = 10^-14 / [OH-]
[H⁺] = 10^-14 / (1.819*10^-3)
[H⁺] = 5.50*10^-12
pH = -log [H⁺]
pH = -log (5.5*10^-12)
pH = 11.26
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When 22.3 g of calcium chloride, CaCl2, was dissolved in water in a constant-pressure calorimeter, the temperature rose from 25.0°C to 37.9°C. If the heat capacity of the solution and the calorimeter is 1258 J/°C, what is the enthalpy change when 1.05 mol of calcium chloride dissolves in water? The solution process is the following.
CaCl2(s) → Ca2+(aq) + 2 Cl −(aq)
The change in enthalpy of the solution when 1.05 mol of calcium chloride dissolves in water is 15455.43 J/mol
What is Change in EnthalpyThe enthalpy change when a substance dissolves in water is called the heat of solution or enthalpy of solution. The heat of solution can be calculated using the equation:
ΔHsolution = q / n
Where:
q = heat absorbed or released during the solution process (can be measured by a calorimeter)
n = number of moles of solute dissolved
Given that the heat capacity of the solution and the calorimeter is 1258 J/°C, and the temperature rose from 25.0°C to 37.9°C, we can calculate the heat absorbed during the solution process using the equation:
q = mcΔT
Where:
m = mass of the solution (can be assumed to be the mass of water)c = heat capacity of the solution and the calorimeter (1258 J/°C)ΔT = change in temperature (37.9 - 25.0 = 12.9°C)Substituting the values we get:
q = 1258 J/°C * 12.9°C = 16,228.2 J
Now, we can use this value of q to calculate the enthalpy change when 1.05 mol of calcium chloride dissolves in water by using the equation:
ΔHsolution = q / n
Substituting the values we get:
ΔHsolution = 16,228.2 J / 1.05 mol = 15,455.43 J/mol
Therefore, the enthalpy change when 1.05 mol of calcium chloride dissolves in water is 15,455.43 J/mol.
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without making or breaking bonds, the pictured molecule can change its shape because ...
The pictured molecule can change its shape because it is composed of atoms held together by non-covalent interactions, such as hydrogen bonds, van der Waals forces, and ionic interactions.
What is hydrogen bonds?Hydrogen bonds are a type of chemical bond that occurs when a hydrogen atom is covalently bonded to either a highly electronegative atom such as oxygen, nitrogen, or fluorine, or an atom that has an unshared pair of electrons. Hydrogen bonds are weaker than covalent or ionic bonds but much stronger than van der Waals forces.
These types of bonds are relatively weak and can be easily disrupted and reformed, allowing the molecule to bend, twist, and move in various directions. This allows the molecule to change its shape without making or breaking bonds.
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Find the percentage dissociation and hydrogen ion concentration of 0.2 mol/dm^3 of ethanoic acid if the equilibrium constant of acid is 1.85x10^-5 mol/dm^3
The percentage dissociation is 0.97% and the hydrogen ion concentration is 1.93 x 10^-3 mol/dm^3.
To find the percentage dissociation and hydrogen ion concentrationwe need to use the equation:
Ka = [H^+][A^-] / [HA]
where Ka is the equilibrium constant, [H^+] is the hydrogen ion concentration, [A^-] is the concentration of the dissociated form of the acid (acetate ion), and [HA] is the concentration of the undissociated form of the acid (ethanoic acid).
We know the concentration of ethanoic acid, [HA] = 0.2 mol/dm^3, and the value of the equilibrium constant, Ka = 1.85 x 10^-5 mol/dm^3.
Using the equation:
Ka = [H^+][A^-] / [HA]
1.85 x 10^-5 = [H^+][A^-] / 0.2
[H^+][A^-] = 1.85 x 10^-5 * 0.2
[H^+][A^-] = 3.7 x 10^-6 mol^2/dm^6
Since the concentration of the acetate ion is equal to the concentration of the hydrogen ion, [A^-] = [H^+].
So,
[H^+]^2 = 3.7 x 10^-6 mol^2/dm^6
[H^+] = sqrt(3.7 x 10^-6) = 1.93 x 10^-3 mol/dm^3
The hydrogen ion concentration is 1.93 x 10^-3 mol/dm^3.
To find the percentage dissociation, we divide the concentration of the acetate ion by the initial concentration of ethanoic acid and multiply by 100:
Percentage dissociation = ([A^-] / [HA]) * 100
Percentage dissociation = (1.93 x 10^-3 / 0.2) * 100 = 0.97%.
Therefore, The percentage dissociation is 0.97% and the hydrogen ion concentration is 1.93 x 10^-3 mol/dm^3.
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Prepare six straight dilutions of the 0.1% BPB solution. The six dilutions are 1:2, 1:4, 1:5, 1:10, 1:50, 1:100 of your 0.1% solution. The final volume of each dilution should be 4 ml.
What is the final % BPB in each dilution?
The final % BPB in each dilution is 0.001%, 0.0005%, 0.0004%, 0.0002%, 0.00004% and 0.00002%.
To calculate the final % BPB in each dilution, you need to take into account the dilution factor and the initial concentration of the 0.1% BPB solution. The dilution factor is the ratio of the final volume to the initial volume.
The final concentration of BPB in each dilution can be calculated by using the following formula:
Final concentration = Initial concentration x dilution factor
The dilution factors for each dilution are 1:2, 1:4, 1:5, 1:10, 1:50 and 1:100 respectively. By multiplying the initial concentration of 0.1% with these dilution factors, we get the final concentrations of 0.001%, 0.0005%, 0.0004%, 0.0002%, 0.00004% and 0.00002% respectively.
It's important to note that when preparing dilutions, it is important to make sure that the final volume of each dilution is the same, in this case it's 4ml and to use the appropriate dilution factor for each case, as it affects the final concentration of BPB.
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Answer the following questions about an atom of the element aluminum.
11. Write the electron configuration. Circle/highlight the electron(s) that are lost when this atom
becomes an ion.
12. Write the orbital diagram. Circle/highlight the electron(s) that are lost when this atom becomes
an ion.
13. Draw a Bohr's model of the atom, putting electrons in orbits. The orbit capacities are 2, 8, 8, 18.
14. Write the electron dot structure.
15. Does this atom gain or lose electrons to become an ion? How many electrons are gained/lost?
16. Which noble gas has the same electron structure as this ion?
17. Write the symbol for the ion. Put the charge on the top right next to the element symbol.
18. Write the new electron configuration for the ion.
19. Write the name of the ion.
20. Write an equation that shows how the element becomes an ion. Use the symbol e to represent
the electron.
Answer:
11. NA+
12. Radium(ra)
13.Orbit or level energy
Explanation:
consider the atoms in the molecules in model 3 that are bonded to hydrogen. locate those at- oms on the periodic table. based on their location on the periodic table, which atom is the most electronegative?
From the given diagram, the atoms F, Cl, Br and I are bonded to hydrogen in which Fluorine is the most electronegative atom in the periodic table.
All of the elements classified as halogens are found in group 7 of the periodic table. The outer shell of each one of them has 7 valence electrons. Because it has one fewer shell than chlorine, fluorine has a higher electronegativity. The halogen elements have the highest electronegativity of any other group in the periodic table because they only require one electron to occupy their valence orbital. Halogens' electro-negativity is ranked F, Cl, Br, and I in decreasing order. Out of all the elements that are known, fluorine has the highest electronegativity.
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can someone help me pls ,,
Balance the following equations
1. N2O5 -> N2O4 + O2
2. KNO3 -> KNO2 + O2
3. NH4NO2 -> N2 + H2O
4. O3 -> O2
5. Zn + AgCl -> ZnCl2 + Ag
6. NaOH + H2SO4 -> NA2SO4 + H2O
Answer:
Explanation:
Rather than doing all the reactions, let's look at one in detail and develop a process for answering the rest.
Start with a pencil and paper. Pencil, because balancing equations requires some initial guesses that often need to be changed (erased).
Make a table such as shown on the attached worksheet. The first problem is demonstated on the attachment.
1. N2O5 -> N2O4 + O2
2N2O5 -> 2N2O4 + 1O2
2. KNO3 -> KNO2 + O2
We only need 1 K and 1 N for the producrs, and 1 KNO3 supplies that number. But 1 KNO3 has 3 O atoms, while the only place for the O atoms to go is )2, a diatomic molecule. To obtain 2O for the 1O2, we need to change the KNO3 coefficient to 2:
2KNO3 -> KNO2 + O2
Now change the KNO2 coefficient to 2 (to accomodate the 2 K and 2 N atoms):
2KNO3 -> 2KNO2 + O2
The reactants have 6 O atoms, so we should be balanced:
2KNO3 -> 2KNO2 + O2
K 2 2
N 2 2
O 6 4+2 = 6
3. NH4NO2 -> N2 + H2O
NH4NO2 -> N2 + 2H2O
N 2 2 0
H 4 0 4
O 2 0 2 Everything is balanced
4. O3 -> O2
O3 -> O2
2O3 -> 3O2
6 O 6 O
5. Zn + AgCl -> ZnCl2 + Ag
Zn + 2AgCl -> ZnCl2 + 2Ag
Zn 1 1
Ag 2 2
Cl 2 2
Everything is balanced.
6. 2NaOH + H2SO4 -> Na2SO4 + 2H2O
Na 2 0 2 0
O 2 4 4 2
H 2 2 4
S 1 1
Which of the following complexes or complex ions has geometric (cis/trans) isomers?
[Co(NH3)2Cl2]^2- (tetrahedral)
[Cr(NH3)4Cl2]^+
[Cr(NH3)5Cl]^2+
[Pt(NH3)2Cl2] (square planar)
Two of the four compounds will exhibit cis-trans isomerism. They are [Pt(NH₃)₂Cl₂] and [Cr(NH₃)₄Cl₂]+, respectively.
What is isomerism?In chemistry, isomers are molecules or polyatomic ions with the same number of atoms in each element as their molecular formulae, but different atomic configurations in space. The existence or absence of isomers is referred to as isomorphism. Not all isomers share the same physicochemical characteristics. Isomerism is the existence of molecules with the same number of atoms (and, consequently, the same formula), but with different chemical and physical characteristics. When several compounds have the same chemical formula but different chemical structures, this is known as isomerism.
Here,
Cis-trans isomerism will be observed in two of the four compounds. They are respectively [Pt(NH₃)₂Cl₂] and [Cr(NH₃)₄Cl₂]+.
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Which of the following expresses the quantitative measurement? (a)the burette is longer than the pipette. (b)HCl is stronger than HCN d)boiling point of ethyl alcohol is 75°34' water is a colourless liquid.
Answer: d. boiling point of ethyl alcohol is 75.
Explanation:
Which of the following solutions of strong electrolytes contains the largest number of moles of chloride ions: 100.0 mL of 0.30 M AlCl3, 50.0 mL of 0.60 M MgCl2, or 200.0 mL of 0.40 M NaCl?
The largest number of moles of chloride ions are in 100ml of 0.3M AlCl3.
The moles is calculated as
molarity= moles/ molecular weight×100
moles of AlCl3= 0.1×0.3×133.34
= 4 mole where there are 3 chloride ion so it will be 12 moles.
Moles of MgCl2= 0.05× 0.6× 95.21
= 2.85 equivalent to 3moles where 2 chloride ion so it will be
Moles of NaCl =0.2× 0.4 ×58.5
= 4.67 where there are 1 chloride ion so it will be 4.67.
Mole is a measure of the number of substances and molarity is a measure of concentration. Molarity indicates the amount of substance present in a mixture. Molarity is given as the moles of substance in the volume of solvent. A mole is a unit, but a molarity is not.
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What are hydroscopic salts?
Answer:
A hygroscopic salt is a salt that can absorb water
Explanation:
This water usually comes from water vapor in the atmosphere and the process occurs at room temperature. Once the water is absorbed, the physical properties of the salt, like color and viscosity, may change.
sorry if wrong im trying my best forgive me
Answer:
A hygroscopic salt is a salt that can absorb water. This water usually comes from water vapor in the atmosphere and the process occurs at room temperature. Once the water is absorbed, the physical properties of the salt, like color and viscosity, may change. However, the hygroscopic substance does not dissolve.
Hygroscopy - A substance that has the ability to adsorb and absorb moisture or water from the surrounding environment is known as hygroscopic and its property is called hygroscopy. Examples - Silica gel, honey, methanol, concentrated sulphuric acid, glycerine, ethanol, etc.
Explanation:
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Use the food web below and your knowledge of science to answer the question below.
Group 4 Food Web
Hawks are predators to small organism such as snakes, rabbits, and mice. What is a possible result of adding a hawk to this ecosystem?
Question 2 options:
The rabbit population will increase.
The grass population will increase.
The cougar population will increase.
All of the above
Answer:
Pretty sure that’s correct
Explanation:
Answer: The answer is:
The grass population will increase.
Explanation: Didn't see anything that could be correct, so I chose this on the K12 test and it was correct.
What is the difference between a magma formed by fractional crystallization and one formed by ordinary cooling?
The difference between a magma formed by fractional crystallization and one formed by ordinary cooling is that the magma becomes progressively enriched in silica.
What is fractional crystallization of magma?Processes that separate crystals from liquid are referred to as fractional crystallization. The liquid that is left over in this situation is regarded as a fresh magma. The crystals can be removed from a magma by a number of methods. The liquid that many minerals crystallise from is denser than the mineral itself.Fractional crystallisation, in its simplest form, is the removal of newly created crystals from an initially homogenous magma (for instance, via gravity settling) in order to stop these crystals from reacting further with the remaining melt.All igneous rocks are created from magma, which is a naturally occurring substance that is molten or semi-molten. The Earth possesses magma beneath its surface, and other terrestrial planets and several naturally occurring satellites have also been confirmed to have magmatic activity.Learn more about fractional crystallization of magma refer to :
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How many milligrams of caffeine in a cup of coffee?
The amount of caffeine in a cup of coffee can vary widely depending on the type of bean, the brewing method, and the serving size.
On average, an 8-ounce (240-milliliter) serving of coffee contains about 95 milligrams of caffeine. However, this can range from 40 milligrams to as much as 200 milligrams or more depending on the factors mentioned above.
It's worth noting that a standard cup of coffee has about 95-165mg, but a larger cup could have more than that. Also, some types of coffee have higher caffeine content than others.
It's always good to check the label of the product you are consuming or ask the vendor for more information if you are concerned about your caffeine intake.
A solute makes the freezing point of a solution lower than the freezing point of the pure solvent because A. The solute freezes at a lower temperature than the solvent does. B. The solute freezes at a higher temperature than the solvent does. C. Fewer particles of the solute exist in the solution than particles of solvent. D. The liquid phase of the solution reaches equilibrium with the solid phase at a lower temperature
A solute makes the freezing point of a solution lower than the freezing point of the pure solvent because The liquid phase of the solution reaches equilibrium with the solid phase at a lower temperature.
If a solute is dissolved in the liquid at the triple point, the escaping tendency or vapor pressure of the liquid solvent is lowered below that of the pure solid solvent. The temperature must drop to reestablish equilibrium between the liquid and the solid. Because of this fact, the freezing point of a solution is always lower than that of the pure solvent.
The freezing point depression of a solvent is a function only of the number of particles in the solution, and for this reason it is referred to as a colligative property. The depression of the freezing point, like the boiling point elevation, is a direct result of the lowering of the vapor pressure of the solvent.
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in the beta oxidation pathway, what is the product of the enzyme acyl coa-dehydrogenase? assume the starting saturated fatty acid contains n carbons and n is an even number. ch3(ch2)n-4coch2co-coa ch3(ch2)n-2co-coa ch3(ch2)n-4hc
In the beta oxidation pathway, the product of the enzyme acyl coa dehydrogenase is CH3CO-CoA(acety coA).
Describe oxidation.Initially, the word "oxidation" was used to refer to chemical processes in which a element reacts with oxygen. An illustration of this is the oxidation on magnesium in the formation of magnesium oxide when magnesium and oxygen react.
What transpires throughout oxidation?An electron transfer occurs during oxidation. In other words, electrons are lost during oxidation. The reverse of oxidation is a process called reduction, which results in an electron gain. The magnesium ion loses electrons in the mechanism described above, forming magnesium oxide.
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CH4 + 202 -> CO2 + 2H20 What mass of oxygen would be needed to form 10 grams of carbon dioxide?
Carbon dioxide has a molar mass of 44 g/mol. Therefore, 10 g of carbon dioxide would require 10/44 = 0.227 mol of oxygen. The molar mass of oxygen is 32 g/mol, so 0.227 mol of oxygen would require 0.227 x 32 = 7.264 g of oxygen.
What is the oxygen?
Oxygen is a colorless, odorless, tasteless gas that is essential for human life. It is the most abundant element found in the Earth's atmosphere, making up about 21% of the air we breathe. Oxygen is also found in the ocean, in rocks, and in most living things. After hydrogen and helium, it is the third most prevalent element in the universe. Oxygen is essential for cellular respiration, which is the process by which cells obtain energy from food molecules. Oxygen is also used in many industrial processes, such as metal fabrication, welding, and chemical reactions. Oxygen also plays a vital role in creating Earth's ozone layer, which helps protect us from harmful ultraviolet radiation from the sun.
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The mass number is used to calculate the number of ______________________in one atom of an element. In order to calculate the number of neutrons you must subtract the ___________________ from the ______________________.
Answer:
see full answer in below
Explanation:
The mass number is used to calculate the number of neutrons in one atom of an element. In order to calculate the number of neutrons you must subtract the number of protons (atomic number) from the mass number (atomic mass or mass number).
Answer:
The mass number is used to calculate the number of neutrons in one atom of an element. In order to calculate the number of neutrons you must subtract the atomic number from the mass number.
if a city water supply has a limit of 250 ppm of nitrate ion, what is the maximum amount of nitrate ion, in grams, that may be present in a 10,000-gallon reservoir?
Nitrate, also referred to as "cyan syndrome," is a potentially fatal blood disease that can affect neonates less than six months.
Why do plants need nitrates in the first place?The necessity of nitrates in plants. Phosphorus
potassium, and nitrogenPhosphorus The growth of leaves is mostly controlled by nitrogen. Plants utilize nitrates, which are compounds of nitrogen and oxygen. Typically, they absorb nitrates from the soil.
How do plant roots respond to nitrification?Uptake and Needs of Plant Nitrogen Plants can take up the soil's nitrogen as NH4+ and NO3 ions, but most of it is snapped up as nitrate due to how common nitrification is in agricultural soils. Nitrate is easily transported to plants.
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In a px orbital, the subscript x denotes the A. axis along which the orbital is aligned B. size of the orbital C. spin of the electron D. energy of the electron
The axis that the orbital is aligned with is indicated by the subscript x in a px orbital.
The correct statement is A.
The PX orbital is what?px orbital: A p atomic orbital that is located on the x-axis of the Cartesian coordinate system. A non-hybridized carbon atom's px, py, and pz atomic orbitals are located along the x, y, and z axes of the Cartesian coordinate system. Blue represents the atomic orbital of px. These orthogonal p atomic orbitals are.
PX and PY properties: what are they?Context. px. identifies properties that cannot have user input on an HTML form because they are special properties. py. Values can be entered by users on an HTML form because properties with names that begin with py are not special.
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how long (in minutes) must a 5.40 a current be passed through an aqueous solution of zinc nitrate to deposit 87.5 g zn
Zn=65,4Zn^+2 (n=2) This equation states that it will take 47818 seconds or 797 minutes to deposit 87.5 g of zinc nitrate when a current is run through an aqueous of the metal.
How can I obtain zinc nitrate?Typically, zinc nitrate is made by dissolving zn metal, metal oxides, or other similar compounds in nitric acid as follows: Zn + 2 HNO 3 Zn (NO 3) 3 Zn = 2 Plus H. ZnO Plus 2 HNO (NO 3) 2 plus H 2O. The zinc nitrate hydrates as a result of these processes.
Does zinc vaporize in liquid?5 mg Zn2+/L was cited as the legal maximum by the World Health Organization. What form and how does zinc mix with water This process releases hydrogen, which violently interacts with oxygen.
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what mass of sodium benzoate should you add to 150.0 ml of a 0.15 m benzoic acid solution to obtain a buffer with a ph of 4.25?
The mass of sodium benzoate that should you add to 150.0 ml of a 0.15 m benzoic acid solution to obtain a buffer with a ph of 4.25 is 3.72 g.
What is mass?Mass is the quantity of matter of a physical body.
The Pka value = 4.19
so, we are going to use H-H equation:
PH = Pka + ㏒[benzoate/benzoic acid]
when we have PH = 4.25
and Pka = 4.19
By substitution:
4.25 = 4.19 + ㏒[benzaoate/ benzoic acid]
[benzaoate/benzoic acid] = 1.148 M
when the [benzoic acid ] = 0.15 m
[benzaoate] = 1.148M x 0.15m = 0.1722 M
The moles of sodium benzoate = molarity x volume L
0.1722 M x 0.15 L = 0.02583 moles
The mass = moles x molar mass
0.02583 moles x 144 g/mol = 3.72 g
Therefore, the mass of sodium benzoate is 3.72 grams.
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In Chapter 20, we will explore how nitriles can be converted into carboxylic acids. How would you use IR spectroscopy to monitor the progress of this reaction? Select all that apply. O Disappearance of a signal - 1700 cm^-1 O Appearance of a sharp signal -3300 cm^-1 O Appearance of a broad signal between 3200 and 3600 cm^-1 O Disappearance of a signal-2200 cm^-1 O Appearance of a broad signal between 2200 and 3600 cm^-1 O Appearance of a signal -2200^-1 O Disappearance of a sharp signal - 3300 cm^-1 O Appearance of a signal - 1700 cm^-1
IR spectroscopy can be used to monitor the conversion of nitriles to carboxylic acids by observing changes in the absorption bands of the C-N triple bond at 1700 [tex]cm^-1[/tex], C=O functional group at 3300 [tex]cm^-1[/tex], C-O-H functional group between 2200 and 3600 [tex]cm^-1[/tex], and disappearance of the signal at 2200 [tex]cm^-1[/tex].
The disappearance of a signal at 1700 [tex]cm^-1[/tex].The appearance of a sharp signal at 3300 [tex]cm^-1[/tex].The appearance of a broad signal between 2200 and 3600 [tex]cm^-1[/tex].The disappearance of a signal at 2200 [tex]cm^-1[/tex].IR spectroscopy can be used to monitor the progress of the reaction by observing changes in the absorption bands of the functional groups present in the nitrile and carboxylic acid. During the conversion of nitrile to carboxylic acid, the nitrile C-N triple bond absorbs at around 1700 [tex]cm^-1[/tex].
As the reaction proceeds, this signal will disappear as the triple bond is broken. Additionally, carboxylic acids have a sharp absorption band at around 3300 [tex]cm^-1[/tex]. corresponding to the C=O functional group. As the reaction proceeds, this signal will appear as the carboxylic acid is formed.
Furthermore, carboxylic acids have a broad absorption band between 2200 and 3600 [tex]cm^-1[/tex]. corresponding to the C-O-H functional group. As the reaction proceeds, this signal will appear as the carboxylic acid is formed and the signal at 2200 [tex]cm^-1[/tex]. from the nitrile will disappear.
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