We can make use of the correlation approach, T test, and linear regression techniques in this situation.
The two variables in this example of a eutrophic lake are temperature and dissolved oxygen, and both of these variables change over time. Therefore, a correlation test must be performed to see whether a relationship between these two variables exists. Here, the correlation coefficient value will be given to us, allowing us to calculate the linear relationship between these two variables.
Additionally, we can use the T test to determine whether or not the correlation between these two variables is strong enough to reject the null hypothesis.
Finally, we can also utilize the linear regression method to get a more accurate relationship between those two variables.
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At conditions of Standard Temperature and Pressure, determine how many liters of hydrogen gas are produced by placing a zinc nail with a mass of 2.2g into an excess of hydrochloric acid. A) 0.0015 L B) 0.75 L C) 1.33 L D) 6.42 L
According to the argument, 0.75 L of hydrogen is produced when a 2.2g zinc nail is added to an excess of hydrochloric acid.
Where is hydrogen found?It is present in the majority of stars, including the sun, and makes up the majority of Jupiter's surface. The most h on Earth is found in water. Its presence in the air as a gas is limited to less than 1% of the volume.
Is water H2O or hydrogen?Hydrogen has the molecular formula H2 and a molecular formula of 1. The first isotope as among exceed belongs to hydrogen, which is represented by the character H. It is a highly flammable, tasteless, and odorless gas.
Zn + 2HCl → ZnCl2 + H2
moles = mass / molar mass
The molar mass of zinc is 65.38 g/mol, so the number of moles of zinc is:
moles = 2.2 g / 65.38 g/mol = 0.0337 moles
liters = 0.01685 moles * 22.4 liters/mole = 0.375 liters = 375 mL
So, the answer is (B) 0.75 L.
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selenium has 6 electrons in its outermost shell. how many electrons does it need to gain in order to have a full and stable outermost electron shell
In order to achieve the stable electron configuration, the selenium atom obtains two electrons and adopts the Krypton configuration.
The sulfur family, which also comprises selenium, includes tellurium and polonium. Six electrons make up the outermost shell of this family. Particularly for selenium, the electron configuration is 2-8-18-6. Due to the fact that selenium has six electrons in its outermost shell, it can have a variety of valence values. In order to produce its most stable ion, a selenium atom (Se) would gain two electrons.
Since selenium is a member of the oxygen family, often known as group 16, it contains six valence electrons. It searches for two additional electrons to have a whole outer shell of eight electrons.
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studocu lab how would you describe the different types of polymerization techniques and how do they produce different properties of polystyrene?
The descrition the different types of polymerization techniques and they produce different properties of polystyrene because the monomers that make up the polymer have different carbon bonds.
Polymerization is a reaction in which small molecules or monomers combine to form large molecules or polymers. A type of synthetic polymer that is widely used as an electrical insulator and food wrapper is polystyrene. A liquid hydrocarbon that is prepared commercially from petroleum and is carried using a coordinating catalyst.
There are two polymerization techniques, the first is addition polymerization where double bonds break down into single bonds and atoms are added to the compounds that are formed. Monomers open double bonds and join with other monomers to form single bonds. While the second is condensation polymerization, which is the accumulation of functional groups between two monomers. Polymers are formed by the reaction of monomers with each other through other molecular processes.
So different polymerization techniques can produce different polystyrene properties because the monomers that make up the polymer have bonds different carbons such as alkenes, sterinas, and haloalkenes.
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Why does the size of atom decreases as we go across a period?
The attraction between an atom's positive charge and its negatively charged electrons grows as the amount of protons in its nucleus increases.
An atom is what?A anion is uniquely defined by its atoms, which are tiny pieces of substance. An atom is made up of a core nucleus and one or much more negative charged electrons that orbit it .It's possible to see the positively charged, rather large neutrinos and protons which it make up the center.
What elements make up atoms?Quarks + electrons are the two categories of fundamental particles that make up an atom. An region of electrons surrounds the nucleus of the atom. Every particle has a charge that is negative.
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Which molecule will engage in the strongest dispersion forces? Select the correct answer below: a CF b CCL c CBR d. CL
The dispersion forces exerted by the CL molecule will be the strongest. Iodine compounds have the most electrons, hence their dispersion forces are also the maximum.
Describe a molecule.The smallest component of a compound that possesses both its chemical and chemical characteristics. Yet another or more elements make up molecules. There are three different kinds of molecules: atom-sized molecules, element-sized molecules, and compound-sized molecules.
What molecule is the biggest?The appropriate name titin is 20 to 50 times bigger than the typical enzyme, with a degree of polymerization of 1.4 million and an uninterrupted chain of 27,000 polypeptide chains. Molecules are created when atoms come together.
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stomach acid has a ph of about 2.0, and blood has a ph of 7.4. (a) what are their hydrogen-ion concentrations?
About 250 thousand times greater is the hydrogen-ion concentration of stomach acid than that of blood.
In chemistry, awareness is the abundance of a constituent divided by using the whole extent of an aggregate. several styles of mathematical description can be outstanding: mass concentration, molar awareness, quantity concentration, and volume awareness.
In technology, the amount of a substance, which includes salt, this is in a positive amount of tissue or liquid, along with blood. A substance becomes more concentrated while much less water is present. The concentration of the solution may be expressed in molarity, molality, normality, mole fraction, and many others. the attention of a substance is the amount of solute present in a given quantity of answer. Concentrations are commonly expressed in phrases of molarity, defined as the variety of moles of solute in 1 L of answer.
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Complete Question:
Stomach acid has a pH of about 2.0, and blood has a pH of 7.4. How many times greater is the hydrogen-ion concentration of stomach acid than that of blood?
when you read the label on a chemical container, what are the 3 most important pieces of information? (choose three answers.)
1. Product identity (what the chemical is)
2. Hazard warnings (what the chemical can do to harm you or the environment)
3. Handling instructions (how to safely use, store, and dispose of the chemical)
Product identity:
The name or identifier of the chemical substance is the most important piece of information on the label.This information allows you to identify what the chemical is, its intended use, and its potential hazards.This information helps you determine if the chemical is appropriate for your intended use and if there are any special precautions you need to take when handling it.Hazard warnings:
The label should indicate the dangers posed by the chemical, such as flammability, toxicity, and reactivity.This information allows you to make informed decisions about the safe use, storage, and disposal of the chemical.Hazard warnings may include symbols, such as a flame to indicate flammability or a skull and crossbones to indicate toxicity.Handling instructions:
The label should provide information on how to safely handle, store, and dispose of the chemical.This information is critical for preventing accidents and protecting both you and the environment from harm.Handling instructions may include information on protective equipment, such as gloves or a respirator, that should be used when handling the chemical, as well as any storage requirements or disposal procedures.Learn more about chemical containers here:
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2nh3 3cuo -> 3cu n2 3 h2o how many moles of n2 can be made when 108.1 grams of cuo are consumed
1008 moles of n2 can be made when 108.1 grams of CUo are consumed.
What are moles?
A mole is just a measuring scale. In reality, it's one of the International System of Units' seven foundation units (SI). When already-existing units are insufficient, new ones are created. The levels at which chemical reactions frequently occur exclude the use of grammes, yet utilising absolute numbers of atoms, molecules, or ions would also be unclear. To fill this gap between extremely small and extremely huge numbers, scientists created the mole. A mole must be specified or be based on something reproducible, like all other units. The number of atoms in a sample of the isotope carbon-12 was once the basis for the current definition of the mole, which is now based on other factors.
108 mol CuO x (1 mol N2 / 3 mol CuO) = 36 moles of N2.
36 mol N2 x (28 g N2 / 1 mol N2) = 1008 grams of N2.
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the solubility of nach3co2 in water is ~1.23 g/ml. what would be the best method for preparing a supersaturated nach3co2 solution? group of answer choices
The best method for preparing a supersaturated NaCH₃CO₂ solution would be by adding 1.23 g of NaCH₃CO₂ to 200 ml of water at 80 °C while stirring until all the solid dissolves, and then letting the solution to cool at room temperature.
The solubility of a solute in a solution depends upon its concentration.
Given that, the solubility of NaCH₃CO₂ at 80 °C is ~1.23 g/ml. So, If we add 1.23 g of solute at 80 °C and let it cool down slowly without any perturbation, then the resulting solution at room temperature will have a concentration of 1.23 g/200 ml = 0.00615 g/m, which is a supersaturated solution.
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what is Fission
splitting a nucleus into smaller nuclei?
or
putting two nuclei together to form a larger nucleus?
Nuclear fission is the process of splitting of a heavy unstable nucleus into two smaller nuclei. Hence, first option is correct.
What is nuclear fission ?There are many unstable radioactive isotopes which undergo nuclear decay by the emission of alpha or beta particles. Sometimes a heavy unstable radioactive isotope undergo decomposition to produce two smaller nuclei. This process is called nuclear fission.
The fusing of two light nuclei to form a heavy nucleus is called nuclear fusion. Both nuclear fission and nuclear fusion releases tremendous energy to the surroundings.
Nuclear fusion is the source of light and heat energy in sun and other stars. Fusion releases higher energy than fission. Nuclear fission is used in atom bombs.
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. what are the mole fractions of h3po4 and water in a solution of 14.5 g of h3po4 in 125 g of water?
The mole fraction of H3PO4 in the solution is 0.0209, and the mole fraction of water is 0.9791.
To find the mole fractions of H3PO4 and water in a solution of 14.5 g of H3PO4 in 125 g of water, we first need to convert the mass of each substance to moles. To do this, we use the molar mass of H3PO4 (97.994 g/mol) and water (18.015 g/mol).
The moles of H3PO4 in the solution can be calculated as follows: 14.5 g / 97.994 g/mol = 0.1483 mol.
The moles of water in the solution can be calculated as follows: 125 g / 18.015 g/mol = 6.944 mol.
Next, the mole fractions can be calculated by dividing the moles of each substance by the total number of moles in the solution:
Mole fraction of H3PO4 = 0.1483 mol / (0.1483 mol + 6.944 mol) = 0.0209
Mole fraction of water = 6.944 mol / (0.1483 mol + 6.944 mol) = 0.9791
Therefore, the mole fraction of H3PO4 in the solution is 0.0209, and the mole fraction of water is 0.9791.
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a certain reaction has an activation energy of 70.81 kj/mol. at what kelvin temperature will the reaction proceed 4.50 times faster than it did at 365 k?
387.27 K temperature will the reaction proceed 6.00 times faster than it did at 337 K.
k2 is 6 times k1 and hence k2/k1 = 6
we have ln(k2/k1) = Ea/R (1/T1- 1/T2)
ln(6) = 38670/8.314 x( 1/337 -1/T2)
0.00038522 = (1/337 -1/T2)
1/T2 = 0.0033525
T2 = 387.27 K
In chemistry and physics, activation electricity is the minimal amount of electricity that has to be supplied for compounds to result in a chemical reaction. The activation energy of a reaction is measured in joules per mole, kilojoules in keeping with mole, or kilocalories consistent with mole.
Activation strength is described as the minimum quantity of strength required via a reacting molecule to get transformed into a product. it may additionally be defined because the minimal amount of energy had to prompt or energize molecules or atoms in an effort to go through a chemical reaction or transformation. In transition-state theory, activation electricity is the distinction in electricity content material between atoms or molecules in an activated or transition-country configuration and the corresponding atoms and molecules in their initial configuration.
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Complete Question:
A certain reaction has an activation energy of 38.67 kJ/mol. At what Kelvin temperature will the reaction proceed 6.00 times faster than it did at 337 K?
if you have 1.0 mol of each of the following compounds, which will have the greatest mass?
It implies that the messiest substance is 1.0mole of NI3. The right response is A.
Exactly whichever particle has the largest mass?Of all known elements, provides an extraordinary has the greatest atomic mass and atomic number. Only five (perhaps six) elements of the atom oganesson-294 have been found since 2005 due to the decaying atom's extreme instability.
Which mole is the mossiest?Answer and justification As a result, we can observe that a mole of sulfuric acid has the largest mass.
NI3 has a molar mass of 394.72g/mol.
H3PO4 has a molar mass of 97.99 g/mol.
KCl has a molar mass of 74.55g/mol.
FeCl3 does indeed have a molarity if 162.2 g/mol.
It implies that the messiest substance is 1.0mole of NI3. The right response is A.
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The complete question is:
If you have 1.0 mol of each of the following compounds, which will have the greatest mass? A.) NI3 B.) H3PO4 C.) KCl D.) FeCl3
the diels-alder reaction is one example of what type of reaction?
The Diels-Alder reaction is an electrocyclic process that involves the [4+2]cycloaddition of 2 and 4 electrons from the dienophile and 4 electrons from the conjugated diene (an alkene or alkyne).
What is a case of a Diels-Alder reaction?A conjugated diene and an alkene undergo a cycloaddition event in the Diels-Alder reaction. A 1,4-addition product is created by this reaction. The reaction of 1,3-butadiene with maleic anhydride serves as an example.
Which reaction most accurately sums up the Diels-Alder reaction?Consequently, [4+2] cycloaddition is the name given to the cyclic addition of diene and dienophile. This shows that a Diels-Alder reaction is best described by the [4+2] cycloaddition.
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How many atoms are present in 6 molecules of
Fe3(PO4)2
a.
13
b.
10
c.
78
d.
50
6 molecule of Fe[tex]_3[/tex](PO[tex]_4[/tex])[tex]_2[/tex] contains 78 atoms. Therefore, the correct option is option C among all the given options.
What is atom?The smallest unit of matter that may be split without producing electrically charged particles is the atom. It is also the smallest piece of substance with chemical element-like characteristics. As a result, the atom serves as the fundamental unit of chemistry.
Space makes up the majority of an atom. The remainder is made up of a cloud of electrons with negative charges around a positive-charged nucleus made up of protons and neutrons. Compared to electrons, that are the smallest charged particles in nature, the nucleus is tiny and dense.
1 molecule of Fe[tex]_3[/tex](PO[tex]_4[/tex])[tex]_2[/tex] contains 13 atoms
6 molecule of Fe[tex]_3[/tex](PO[tex]_4[/tex])[tex]_2[/tex] contains 13×6=78 atoms
Therefore, the correct option is option C.
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Energy Change in Chemical Reactions: Reflect
Write a reflection about your learning in this unit. Your reflection should be at
least 3 sentences. Use the following sentence starters as a guide.
• I feel confident about creating energy diagrams because...
It is challenging to figure out which bonds are broken in a reaction
because...
• One strategy I used to figure out whether energy is gained or lost in a
system was to...
• To remember definitions of vocabulary words in this unit, one strategy I
used was...
Answer:
hi
I feel confident about creating energy diagrams because I have been practicing creating energy diagrams for different reactions and understanding how to interpret them. It is challenging to figure out which bonds are broken in a reaction because it requires a good understanding of chemical bonds and reaction mechanisms. One strategy I used to figure out whether energy is gained or lost in a system was to calculate the change in enthalpy using the bond energies of the reactants and products. To remember definitions of vocabulary words in this unit, one strategy I used was to create flashcards and quiz myself regularly on their meanings. Overall, this unit has helped me understand how energy is involved in chemical reactions and how it affects the stability of a system.
molecules need a carrier protein to help them move across a membrane because
Since they are lipid impermeable or too big, molecules require a transport protein to assist them traverse a membrane.
Which molecules are those who?A molecule is the smallest component of a material that keeps its content and characteristics. It is made up of two or more electrons that are linked together by chemical bonds. Biochemistry is constructed on molecules. The element name and a subscript indicating the amount of atoms are used to identify molecules.
Water: A Chemical or Not?Molecules are created when elements come together. Two hydro (H) atom and one oxide (O) atom make up the three atoms that make up a water molecule. This is why water is occasionally shortened as H2O. There are billions of hydrogen atoms in an one drop of liquid.
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If we decrease the temperature to 200 k at constant pressure, what would the new volume be?
If we decrease the temperature to 200K at constant pressure, according to the ideal gas law equation, new volume will decrease.
Volume is a measure of the amount of space occupied by an object or substance.
If we assume that the gas is ideal and that its behavior follows the ideal gas law,[tex]\rm PV = nRT[/tex], then we can make a prediction about how the volume will change.
If we decrease the temperature to 200 K at constant pressure, the volume of the gas will decrease. According to the ideal gas law, if the pressure and number of moles of gas remain constant, the volume of the gas is directly proportional to the temperature of the gas.
Therefore, if we decrease the temperature, the volume will decrease proportionally.
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for a zeroth-order reaction, if the concentration of reactant a is plotted vs. time, which corresponds to the slope of this plot?
The slope of a plot of concentration of reactant A versus time for a zeroth-order reaction represents the rate of reaction. In a zeroth-order reaction, the rate of reaction is constant and independent of the concentration of the reactant. Thus, the slope of the plot will be a constant value that represents the rate constant of the reaction. This means that the rate of the reaction is proportional to the negative of the slope of the plot, and the units of the rate constant will be concentration/time.
In a zeroth-order reaction, the rate of reaction is directly proportional to the concentration of reactant and is independent of time. If we plot the concentration of reactant "a" against time, the slope of this plot will correspond to the rate of the reaction at that particular time. The slope will be negative, indicating that the concentration of reactant is decreasing as time passes. The magnitude of the slope will reflect the speed of the reaction and how quickly the reactant is disappearing. Zeroth-order reactions have a constant rate, and the slope of the plot will remain the same, regardless of the concentration of the reactant. This makes zeroth-order reactions useful in applications such as drug kinetics, where the rate of reaction is a critical factor.
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for a saturated aqueous solution of n2(g) at 20 oc and 1 atm, will the solubility increase, decrease or not change when the indicated change occurs? (1) the solubility of n2(g) decreases when pressure decreases. (2) the solubility of n2(g) decreases when temperature increases.
Both an increase in temperature and a decrease in pressure will lead to a decrease in the solubility of N2(g) in a saturated aqueous solution.
Solubility Factors-
For a saturated aqueous solution of N2(g) at 20°C and 1 atm, the solubility of N2(g) will decrease when the temperature increases and will also decrease when the pressure decreases.
(1) The solubility of a gas in a liquid is directly proportional to the pressure of the gas above the liquid. According to Henry's Law, the solubility of a gas in a liquid is proportional to the pressure of the gas above the liquid, so when the pressure decreases, the solubility of N2(g) will decrease.
(2) The solubility of a gas in a liquid decreases with increasing temperature. As the temperature of a solution increases, the solubility of gases in the solution decreases. This is because the increased temperature increases the kinetic energy of the gas molecules, allowing them to escape more easily from the solution into the gas phase.
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What does a folded polypeptide indicate?
The form of the complete folded polypeptide is referred to as the tertiary structure. Dipole-dipole interactions and hydrogen bonds between polar amino acids are what allow this structure to emerge.
Are polypeptides a kind of protein?These amino acids are arranged in a long chain and joined to one another by covalent peptide bonds to form proteins. Polypeptides are another name for proteins. The amino acid sequence found in every kind of protein is distinct and identical from one protein to the next.
The function of polypeptidesPolypeptides. Proteins are created by joining several amino acids together to form polypeptides. The combining of four or more glycoprotein results in the formation of proteins, which are then pleated into the appropriate shape.
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What is required for an electron to be ejected from a metal sample?
Answer:
the light has to have a short enough wavelength (high frequency)
Explanation:
most metals semiconductors and ceramics have a crystalline structure in which the atoms or ions display short range order true false
The given statement is true. Most metals semiconductors as well as ceramics have a crystalline structure in which the atoms or ions display short range order.
Semiconductor: A semiconductor is a substance that has specific electrical properties which enable it to serve as a foundation for computers as well as other electronic devices. It is typically a solid chemical element or compound which conducts electricity under certain conditions but not others.
In a crystalline solid, the atoms or ions are arranged in a repeating pattern, giving the material long-range order and stability. This is what gives crystalline solids their characteristic mechanical and thermal properties. The short-range order refers to the arrangement of atoms or ions within individual crystal lattice unit cells, while the long-range order refers to the arrangement of unit cells across the entire solid.
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CaCl2 is a salt that forms as the result of what type of bond?
A. covalent
B. hydrogen
C. polar
D. non-polar
E. ionic
The offered statement claims that CaCl2 is a salts that develops as a result of an ionic connection.
Who or what uses CaCl2?An ionic substance called calcium chloride is prescribed to treat hypocalcemia and hyperkalemia as well as to treat calcium intoxication brought on by taking too much magnesium sulfate. This ionic compound calcium chloride is created when limestone and chlor interact. It is extremely insoluble in water or deliquescent.
What distinguishes calcium chloride from bleach?a strong oxidizing disinfectant that is a fine white powder. Chlorine gas is passed through slaked lime to create calcium chloride chlorine ions. In water, it breaks down and releases chlorine. Some industrial bleaching powders are made by combining calcium hypochlorite plus calcium chloride physically.
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when sugar is added to water, what is the change observed in the boiling and freezing points of water? select one: a. boiling point increases and freezing point decreases. both boiling point and freezing point increases. c. both boiling point and freezing point decreases. the. boiling point decreases and freezing point increases.
Answer:
A
Explanation:
True or False: Diamonds and Cubic Zirconia are similiar but made of different atoms. Diamonds are made of the atom, Carbon, and Cubic Zirconia does not have a single carbon atom in its chemical formula.
Answer:
True
Explanation:
a 1.1743 g sample of an unknown nonelectrolyte is dissolved in 10.0087 g of benzophenone and produces a solution that freezes at 35.3 oc. if the pure benzophenone melted at 48.1 oc, what is the molecular weight of the unknown compound? the kf for benzophenone is 9.8 oc/m.
The molecular weight is 84.43 g
m = moles of solute x 1000 / mass of solvent (g)
so
moles of solute x 1000 / 10.0028 = 1.1938
moles of solute = 0.0119
moles = mass / molar mass
1.0083 / molar mass = 0.0119
molar mass = 1.0083 / 0.0119
molar mass = 84.43
In chemistry, the molar mass of a chemical compound is defined as the ratio between the mass and the quantity of substance of any sample of said compound. The molar mass is a bulk, now not molecular, belongings of a substance.
Molar mass M is the mass of a chemical compound divided by its amount of substance measured in moles. it's far defined as MB = m/nB, in which m is the overall mass of a sample of natural substance and nB is the amount of substance B given in moles. The definition applies to pure substance. Molar mass is the mass of 1 mole of any substance. One mole of any species (atoms, molecules, ions, or debris) is that amount in a variety having a mass same as its atomic or molecules mass in grams. Molar mass is represented through "M"
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Complete Question:
A 1.0083 g sample of an unknown nonelectrolyte is dissolved in 10.0028 g of benzophenone producing a solution that freezes at 36.4 C. If the pure benzophenone melted at 48.1 C, what is the molecular weight of the unknown compound? The Kf for benzophenone is 9.8 C/m.
the azimuthal (subsidiary) quantum number provides us with information about which characteristic of an electron bound in an atom?
The azimuthal quantum number provides information about the shape and angular distribution of an electron's orbital in an atom.
What information does azimuthal number provide?
The azimuthal (subsidiary) quantum number, also known as the angular momentum quantum number (l), provides information about the shape and angular distribution of an electron's orbital in an atom.
The value of the azimuthal quantum number can range from 0 to (n-1), where n is the principal quantum number. The value of l determines the type of orbital occupied by the electron, with different values of l corresponding to different shapes of the orbital. The four types of orbitals are s, p, d, and f orbitals.
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cacl2 is a salt that forms as the result of what type of bond?
Ionic bonds is the reason which result in the formation of the salt CaCl2.
An ionic bond is what?Ions having opposing charges electrostatically attract one another to form ionic bonds, sometimes referred to as electrovalent bonds, in chemical molecules. Whenever the valance (outermost) electron of one atom are permanently transferred to another atom, a bond of this kind is created.
How are ions bound together?The total transfer of certain electron through one atom to that other results in the formation of an ionic connection. A negatively charged ion known as a cation results from an atom loosing one or more electrons. When an atom receives one or more electrons, it produces an anion, or negative charges ion.
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which of the following is not a likely indicator of a chemical change? select the correct answer below: the formation of a precipitate a color change the change in shape of a malleable metal the release of gas without adding heat or lowering the pressure
Answer:
c the change of a shape of malleable metal
Explanation:
yes!!