Answer:
The correct answer is 64.3%
Explanation:
To calculate the percentage purity of the calcium carbonate, we need to determine the amount of calcium carbonate present in the 7.0 grams of impure sample. This can be done by using the following equation:
Percentage purity = (Mass of pure substance / Total mass) x 100%
Since 2.5 grams of carbon dioxide was produced during heating, we can assume that 2.5 grams of the impure sample were calcium carbonate. Therefore, the mass of the pure substance is:
Mass of pure substance = 7.0 g - 2.5 g = 4.5 g
And the percentage purity of the calcium carbonate is:
Percentage purity = (4.5 g / 7.0 g) x 100% = 64.3%
So, the impure calcium carbonate in the experiment has a purity of 64.3%.
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1. The reaction C2H4 + HBr to C2H5Br is carried out in continuous reactor. The product stream is analysed and found to contain 50 mole % C2H5Br and 33. 3% Br. The feed to the reactor contains only C2H4 and HBr. Calculate the fractional conversion of limiting reactant and the percentage by which the other reactant is in excess
In a continuous reactor, the materials are transported as a stream that is always running, allowing the reactants to be continuously supplied into the reactor and producing a stream of product in the process.
What is the identification of limiting reactant?Along with that, it ought to be necessary to know the mole counts of unreacted species. The amount of products created from each reactant can be compared in order to determine the limiting reactant.
When producing huge amounts of chemicals, a continuous reactor—also called a flow reactor—is employed.
Therefore, The mole number of the reactant and the finished product should be computed in order to determine the limiting reactant in a chemical reaction.
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Is the subscript "1" usually written or understood?
Responses
A writtenwritten
B shownshown
C understoodunderstood
Is the subscript "1" usually understood. Therefore, option C is correct.
What is subscript ?A subscript is a character that is printed slightly below and to the side of another character, typically a letter or number. Subscripts are frequently used in chemical equations. A scientist would write the water formula, H2O, with the 2 lower and smaller than the letters on either side.
Subscripts indicate the proportion of atoms of various elements in the compound. Because the molecule contains four hydrogen atoms, the subscript 4 follows the symbol for hydrogen. When a symbol in a formula lacks a subscript, the number 1 is understood.
Thus, option C is correct.
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Explain why a molecule can have bond dipoles but not have a molecular dipole.
The presence of polar bonds in a molecule does not imply the presence of a molecular dipole. Carbon dioxide and carbon tetrachloride, for example, have polar bonds but no net molecular dipole.
What is the difference between bond dipoles and molecular dipoles?Bond polarity is related to the individual polarity of the bond in a molecule, whereas molecular polarity is the sum of all the bond polarities in the molecule.
If a molecule is completely symmetric, the dipole moment vectors on each molecule cancel each other out, resulting in a nonpolar molecule.
Thus, a molecule can have bond dipoles but not have a molecular dipole.
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what is a triglyceride? multiple choice question. a molecule consisting of three fatty acids bonded to a glycerol a three-carbon alcohol molecule a waxy lipid found in all body cells a fatty acid molecule containing three carbon-carbon double bonds
Option A – A triglyceride is a molecule consisting of three fatty acids bonded to a glycerol.
A triglyceride is a type of fat molecule made up of a glycerol molecule and three fatty acid molecules. Triglycerides are the most common type of fat found in food and are also stored in the body as a source of energy. When we eat foods high in fat, the body breaks down the triglycerides into their component fatty acids and glycerol and uses them as fuel. If we eat more fat than we can burn, the body stores the excess as body fat, which can contribute to obesity and other health problems if it accumulates in large amounts. Triglycerides play a role in the development of heart disease and other health problems, and their levels can be measured through a blood test. A high triglyceride level, combined with low levels of "good" cholesterol (HDL), can increase the risk of heart disease, stroke, and other health problems. Maintaining a healthy diet, getting regular exercise, and managing stress can help to keep triglyceride levels in check.
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why is hcl used instead of plain deionized water in p-phenetidine in amide synthesis of acetophenetidin?
HCl is used instead of plain deionized water in p-phenetidine in amide synthesis of acetophenetidin because HCl's polarity contributes to a reaction driven to the right, it is used for the acid-base reaction rather than water. It protonates the amine group, allowing it to dissolve easily.
What is acid-base reaction ?An acid-base neutralization reaction is represented as a double-replacement reaction in this traditional representation. For example, the reaction of hydrochloric acid (HCl) with sodium hydroxide (NaOH) solutions yields a solution of sodium chloride (NaCl) and a few extra water molecules.
When acid and base react, they produce salt and water. Water and salt are both neutral, which means that when acid and base react, they neutralize each other. As a result, it is known as a neutralization reaction.
Thus, HCl's polarity contributes to a reaction driven to the right.
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What does soluble and insoluble mean in chemistry?
Solids that are soluble in a liquid are said to be soluble solids. Solids that cannot dissolve in water are known as insoluble solids.
What is the meaning of soluble or insoluble?I Compounds that disintegrate in a particular liquid to form a solution are known as soluble solids. I Solids that cannot dissolve in the water are referred to as insoluble solids. These insoluble substances either floating or sink when added to water, but they do not mix with that as well.
What is insoluble water?Something like this that won't disintegrate in a solvent is said to be insoluble. Rarely does a solute not dissolve at all. However, many compounds are not very soluble. Examples include sand, lipids, timber, metals, and plastic.
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A sample of baking soda, nahco3, always contains 27. 37% by mass of sodium, 1. 20% of hydrogen, 14. 30% of carbon, and 57. 14% of oxygen. Which law do these data illustrate?.
A sample of baking soda, NaHCO₃, always contains 27. 37% by mass of sodium, 1. 20% of hydrogen, 14. 30% of carbon, and 57. 14% of oxygen. These data illustrate the law of constant proportion.
According to the law of constant proportions, components in chemical compounds are present in a fixed mass ratio. This suggests that no matter the source, any pure sample of a chemical will always have the same elements that are present in the same ratio by mass. For instance, pure water will always have a set mass ratio of hydrogen to oxygen (a gramme of water consists of approximately 0.11 grammes of hydrogen and 0.88 grammes of oxygen, the ratio is 1:8).
Some exceptions to this rule exist. Different samples have different elemental ratios in non-stoichiometric substances. The law of constant proportions does not apply to these compounds, hence they are an exception. The law of definite proportions can also be broken by samples of elements with varied isotopic compositions since different isotopes of an element have different weights. The law of constant proportions is also known to be broken by some natural polymers.
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What are the units of k for each of the following? first-order reaction a. M1-1 s1-1 b. M2-2 s1-1 c. M s1-1 d. S1-1
The order of the reaction is 3.
For nth order reaction, the unit of the rate constant is liter
Litre^n−1 mol^1−n t^−1
Hence, n−1=2
n=1+2=3
The unit of rate constant for a reaction is liter²1/mol²1/t
Hence, the order of the reaction is 3.
What is the order of reaction?
The order of a reaction can be defined as the power dependence of the rate on the concentration of all reactants.For example, the rate of a first-order reaction depends only on the concentration of one species in the reaction.Some reaction order characteristics for a chemical reaction are given below.To know more about order of reaction, click the link given below:
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PLEASE HELP ME
A. 60.6g CO2
B. 30.3g CO2
C. 121.2g CO2
Theoretical yield of water is 50.4g. Theoretical yield of a reaction is achievable if the limiting reactant has been identified.
What is limiting reactant?In a chemical reaction, the limiting reactant, also known as the limiting reagent, controls how much product is produced. Calculating the theoretical yield of a reaction is achievable if the limiting reactant has been identified.
Because elements and compounds in an equilibrium chemical equation react in accordance with their mole ratios, there must be a limiting reactant.
2H[tex]_2[/tex] + O[tex]_2[/tex] [tex]\rightarrow[/tex] 2H[tex]_2[/tex]O
moles of H[tex]_2[/tex] = 11 gram/ 2=5.5moles
moles of O[tex]_2[/tex] = 45gram/32=1.40moles
O[tex]_2[/tex] is the limiting reagent
moles of water = 2.80moles
theoretical yield of water= 2.80×18=50.4g
Therefore, theoretical yield of water is 50.4g.
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the emission spectrum of hydrogen consists of several series of sharp emission lines in the ultraviolet (lyman series) in the visible (balmer series) and in the infrared (paschen series, brackett series, etc.) regions of the spectrum. (a) what feature of the electronic energies of the hydrogen atom explains why the emission spectrum consists of discrete wavelength rather than a continuum wavelength?
The emission spectrum of hydrogen consists of discrete wavelengths rather than a continuum because of the quantization of energy levels in the hydrogen atom.
What is emission spectrum?
An emission spectrum is a spectrum of electromagnetic radiation emitted by a substance as a result of electronic transitions from a higher energy state to a lower energy state. In an emission spectrum, a sample of a substance is excited by an external energy source, such as heat, light, or electricity, which causes electrons in the substance to be elevated to higher energy levels.
According to quantum mechanics, electrons in an atom can occupy only certain energy levels, and they cannot occupy levels in between.
When an electron in an excited state of the hydrogen atom returns to its ground state, it releases energy in the form of a photon with a specific wavelength that corresponds to the difference in energy between the two states.
Since only certain energy levels are allowed in the hydrogen atom, only certain wavelengths of photons can be released, leading to the discrete line spectrum rather than a continuous spectrum.
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How do you calculate heating and cooling curve?
The equations q = mcT, whereby m is the test mass, c is the absolute temperature, and T is the change in temperature, may be used to quantify the amount of hot air received or dissipated by a test (q).
The mass simple answer is what?A thing's mass is just how much matter it has. Something will weigh more the more matter it includes. For illustrate, an elephant pounds more than a mouse because it has more stuff.
In physics, what do mass and mass mean?A measurement of an object's kinetic attribute, or how much matter it contains, is the entity's mass. The force of gravity falling on an item is measured by its weight.
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how many cl- ions are there in 400.5 grams of alcl3? A. 9.000 ionsB. 1.500 X 10^-23 ionsC. 1.810 X 10^24 ionsD. 5.420 X 10^24 ions
The number of cl- ions are there in 400.5 grams of alcl3 is 9.000 ions.
An atom or molecule with a net electrical charge is known as an ion. Conventionally, the charge of an electron is thought to be negative. This charge is equivalent to and opposite from the charge of a proton.
Lets start by calculating molar mass of AlCl₃
Molecular mass of Aluminium is 27 and that of Chlorine is 35.5
Al = 1 x 27 = 27
Cl = 3 x 35.5 = 106.5
AlCl₃ = 27 + 106.5
AlCl₃ = 133.5
The number of ions of Cl using proportions is
133.5 grams of AlCl₃ ------------- 3 ions of Chlorine
400.5 grams of AlCl₃ ------------ x
x = (400.5 x 3) / 133.5
x = 9
Therefore, the number of cl- ions are there in 400.5 grams of alcl3 is 9.000 ions.
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"Why does magnesium chloride
(MgCl2) have a higher lattice energy than sodium chloride (NaCl)?"
Magnesium chloride, with the inorganic compound MgCl2, is an inorganic compound. It produces hydrates MgCl2nH2O, where n may be any value around 1 and 12. These salts are solids which are either colorless or white and are very soluble in water. These substances, both in their compounds and in their solutions, are found in nature and have many important uses. The principal precursor of magnesium oxide, which is manufactured on a vast scale, is anhydrous magnesium chloride. The form that is most widely obtainable is calcium magnesium bromide.
The formula for magnesium chloride is MgCl2. This signifies that it has two chloride atoms and one magnesium atom in it. It is a solution that combines either magnesium plus chlorine. It can be obtained from natural from the sun absorption of saltwater.
Despite the fact that the MgCl2 has a greater lattice energy than NaCl, let's examine their melting points. The melting points show a weaker MgCl2 lattice. Furthermore, MgCl2 hydroxyl radicals in water but NaCl does not! This demonstrates that MgCl2's lattice has a covalent character, this indicates that the ionic proportion is smaller.
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an example of a chemical change is group of answer choices boiling alcohol grinding coffee beans. an ice cube melting in a drink digesting a pizza coffee spilled on a shirt
B: "Digesting a pizza" is an example of a chemical change.
Chemical changes occur when chemical reactions take place and result in the formation of new substances with different chemical and physical properties. The process of digestion of food involves various chemical reactions such as hydrolysis, oxidation, and reduction, which break down complex food molecules into simpler compounds that can be absorbed and used by the body. The original pizza molecules are transformed into new substances and this constitutes a chemical change.
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How should spill materials be discarded?
Cleaning supplies for spills should always be disposed of as hazardous trash. Therefore, it is necessary to store and package items like sorbent materials and cleaning supplies for the disposal of hazardous waste.
What is equipment, briefly?The term "equipment" most frequently refers to a group of items or other things that are regularly employed to accomplish a certain goal. Equipment needs vary depending on the work.
Is there a term for equipment?The plural form of the word equipment is absent. There is no term "equipments," it is only used in the singular, and it goes with a singular verb. There are about 100 common words in this category, which are referred to as "noncount nouns" or "mass nouns."
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Consider 5.00 L of a gas at 365 mmHg and 20. ∘C . If the container is compressed to 2.70 L and the temperature is increased to 33 ∘C , what is the new pressure, P2 , inside the container? Assume no change in the amount of gas inside the cylinder.
Consider 5.00 L of a gas at 365 mmHg and 20.∘C . If the container is compressed to 2.70 L and the temperature is increased to 33 °C, the new pressure, P2 , inside the container is 563.372 mm Hg.
What is ideal gas law ?The ideal gas law, also known as the general gas equation, is the state equation for a hypothetical ideal gas. Although it has several limitations, it is a good approximation of the behavior of many gases under many conditions.
Apply ideal gas law
P1V1/T1 = P2V2/T2
365 × 5 / 293 = P2 × 2.70 / (33+273)
P = 365 × 5 /293 /2.70 × (33+273)
P = 563.372 mm Hg
Thus, the new pressure, P2 , inside the container is 563.372 mm Hg.
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Molecular polarity question
Explain why a molecule can have bond dipoles but not have a molecular dipole.
The presence of polar bonds in a molecule does not imply the presence of a molecular dipole. Carbon dioxide and carbon tetrachloride, for example, have polar bonds but no net molecular dipole.
What is the difference between bond dipoles and molecular dipoles?Bond polarity is connected to each bond's particular polarity in a molecule, but molecular polarity is the total of all the bond polarities in the molecule. This is the difference between bond dipoles and molecular dipoles.
A molecule will become nonpolar if it is entirely symmetric, as the dipole moment vectors on each molecule will cancel each other out.
Thus, a molecule can have bond dipoles but not have a molecular dipole.
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water molecules stick to other water molecules because
If you have 1. 0 mol of each of the following compounds, which will have the greatest mass?.
NI3 has the highest molar mass = 394.707 grams
1 mole of each substance contain mass which is equal to molar mass of the substance .Molar mass is calculated in the same way the molecular mass is calculated.The Molar mass id expressed in grams.How to calculate Molecular mass?Molecular mass = Mass of the atom x the number of atoms
Atomic mass of H = 1.00 amu
O = 15.99 amu
P = 30.97 amu
= 3(Mass of H) + 1(Mass of P) + 4(Mass of O)
= 3(1)+ 1(30.97) + 4(15.99)
= 3 + 30.97 + 63.96
= 97.93 gram
= 1 (mass of N) + 3(mass of I)
= 1(14.0067)+3(126.9)
= 394.7067 grams
= 1(atomic mass of Fe) + 3(atomic mass of Cl)
= 1(55.845)+3(35.45)
= 55.845 + 106.35
= 162.195 grams
KCl = 1(mass of K) + 1(mass of Cl)
= 1(39.09) + 35.45
= 74.54 gram
Out of these NI3 has the highest molar mass = 394.707 grams
Hence NI3 is a correct answer.
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A regular 12-oz beer is about 5% alcohol. This works out to about 14. 03 grams of alcohol per beer. If the driver drank two beers, how many grams of alcohol did he consume?.
A regular 12-oz beer is about 5% alcohol. This works out to about 14. 03 grams of alcohol per beer. If the driver drank two beers, he consume 28.06 grams of alcohol.
A regular 12-oz beer has 5% alcohol by volume. According to this, a beer contains roughly 14.03 grams of alcohol.
So the mass alcohol in two beers would be
mass alcohol in 2 beers= 2 x mass alcohol in 1 beer
Mass alcohol in 2 beers=14.03 grams of alcohol x 2 = 28. 06 gram
Therefore, 5% alcohol makes up a typical 12-oz beer. According to this, a beer contains roughly 14.03 grams of alcohol. Two beers would equal 28.06 grams of alcohol for the driver.
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how many oxygen atoms in cr(no3)3
Number of oxygen atoms in Cr(NO₃)₃ will be 9.
In Cr(NO₃)₃ the number of Cr atoms will be 1 and N atom will be 3. However, oxygen atoms will be 9.
Oxygen is the chemical element having symbol O and its atomic number will be 8. It is a member of the chalcogen group in the periodic table, a highly reactive nonmetal, and an oxidizing agent that can readily forms oxides with most elements as well as with other compounds. Oxygen is the third-most abundant element in the universe after hydrogen and helium. At standard temperature and pressure, the two atoms of the element bind to form dioxygen, a colorless as well as odorless diatomic gas having formula O₂.
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1. What should you expect when looking at a 1H NMR spectrum of a mixture of compounds?
A. The integrations for peaks will likely look "off" with respect to one another
B. All peaks will be broader and more upfield
C. Splitting will be doubled (singlets will become doublets, doublets will become quartets, etc)
D. Integrations for all peaks will double
A. The integrations for peaks will likely look "off" with respect to one another., is the correct option.
What is NMR spectra?NMR spectroscopy (NMR spectra) is a analytical tool used in chemistry and biochemistry to determine the structure and composition of a molecule by measuring the magnetic properties of its nucleus. NMR spectra provide information about the number of different types of atoms in a molecule, the environment of these atoms, and the distances and angles between them. This information is then used to generate a detailed picture of the molecule's structure and how it is bonding to other molecules.
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A cube of moist soil has a water content of 25%, a specific gravity of solids of 2.7, a total weight of 215 lbs, and a volume of 2 ft. Calculate the saturation, total unit weight, void ratio and porosity.
The saturation is 33%, the total unit weight is 107.5 lbs/ft^3, the void ratio is 0.43 and the porosity is 30%.
To calculate the saturation, we need to find the weight of water in the soil, which is 25% of the total weight of 215 lbs. So, the weight of water is 25/100 * 215 lbs = 53.75 lbs.
Next, we find the weight of solids in the soil, which is 215 lbs - 53.75 lbs = 161.25 lbs.
The saturation (S) is the ratio of the weight of water to the weight of solids in the soil and is calculated as follows:
S = 53.75 lbs / 161.25 lbs = 0.33 or 33%.
The total unit weight of the soil can be calculated using the following formula:
γ = (W_water + W_solids) / V
where W_water is the weight of water, W_solids is the weight of solids, and V is the volume of the soil.
Substituting the values, we get
γ = (53.75 lbs + 161.25 lbs) / (2 ft^3) =
= 215 lbs / (2 ft^3) = 107.5 lbs/ft^3
The void ratio (e) is the ratio of the volume of voids in the soil to the volume of solids in the soil, and can be calculated as follows:
e = V_voids / V_solids = (V - V_solids) / V_solids = (V - W_solids / γ_solids) / (W_solids / γ_solids)
Substituting the values, we get
e = (2 ft^3 - 161.25 lbs / 2.7) / (161.25 lbs / 2.7) = 0.43
Finally, the porosity (n) is the ratio of the volume of voids in the soil to the total volume of soil and is given by:
n = V_voids / V = e / (1 + e) = 0.43 / (1 + 0.43) = 0.43 / 1.43 = 0.30 or 30%.
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why is there size dependence for the strength of ceramics but not for metals
There is the size dependence for the strength of the ceramics but not for the metals because in the ceramic the covalent and the ionic bond is present and in the metals metallic bond is present. The metal bond is weaker.
In the ceramics, the strength is the dependence on the size because of their brittle nature and the microcracks present on it. In the metals, the strength is not depend on the size because of their ductile nature and metals have ability to deform the plastically without any breaking.
Thus, the ceramics are the size dependence because of their tough nature and the metals have the ductile nature.
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what is the anion in koch2ch3?
The anion present in the compound , KOCH₂CH₃ is CH₃CH₂O⁻ .
The ions means that if the atom or the element carry the positive charge means it looses the electrons and form the cation and If the element or the compound carry the negative charge means that it gains the electrons and make the anion.
The compound is : KOCH₂CH₃
The cation present = K⁺
The anion cation = CH₃CH₂O⁻
The ionic compound is formed between the negatively charge anion and the positively charged cation. The ionic compound is formed by the complete transfer of the electrons.
Thus , the anion CH₃CH₂O⁻ is present in the compound KOCH₂CH₃.
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a 20.0 ml sample of glycerol has a mass of 25.8 grams. what is the density of glycerol in ounces/quart?
Glycerol has a density of ounces/quart equal to. The mass of a sample of glycerol is grams. 1 ounce equals 28.4 grams.
What is Glycerol?Glycerol is a colourless, odourless, thick liquid generated from both animal and plant fats. It is also known as glycerin or glycerine. It is always found in a wide range of goods, including medications, personal hygiene products, food, and drinks. It is a natural moisturizer, fluid, and lubricant and is a key component of many fats.
Glycerol – a fat or a sugar?Glycerin is a type of carbohydrate known as a polyol, along with other sugar alcohols including sorbitol and erythritol. Glycerin feels sweet, just as sugar alcohols, which I've already discussed. Many living creatures require the sugar alcohol glycerol to survive. It is a part of lipids like phospholipids and glycerides, among others. Glycerol joins with fatty acids to create glycerides, which can act as an energy source.
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Question
Drag each tile to the correct box.
Based on your observations in this task, rank the three types of substances according to the strength of the forces between particles, from weakest to strongest.
Tiles
A. ) polar substances
B. ) nonpolar substances
C. ) ionic substances
Therefore option C is the correct option.
The gravitational force that binds the atom's constituent particles together is known as intermolecular force. The force that unites the many parts when they combine is the one that is being discussed in the inquiry.
Ion-dipole forces, hydrogen bonds between molecules, dipole-dipole forces, and van der Waals forces are the intermolecular forces listed in the answer choices in order of strength to weakness. The strongest intermolecular attraction is between dipoles. They exist between all types of molecules, whether ionic or covalent, polar or non-polar, and are the weakest intermolecular forces.
Compared to liquids and gases, solids typically exhibit the highest intermolecular forces. Because the particles are packed closely together, solids are incompressible and dense. The London dispersion force is the least powerful intermolecular force.
Dispersion Force of London Because it is a transient attractive force that causes a transient dipole, the London dispersion force is also known as the induced dipole. Nonpolar monatomic gases can exhibit London dispersion.
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What is potassium iodide formula used for?
Potassium iodide is used to avoid the loss of iodine due to oxidation from salts
What are compounds ?
A compound is a substance consisting of two or more elements chemically combined in a fixed ratio. They differ from mixtures consisting of two or more substances physically mixed without chemical bonding. Compounds have their own physical and chemical properties that differ from those of individual elements. For example, the compound water (H2O) has different properties (boiling point, density, solubility, etc.) than its components hydrogen (H2) and oxygen (O2).
Compounds are formed by chemical reactions in which atoms of different elements combine to form new substances. The formation of a compound can be represented by a chemical formula that indicates the type and number of atoms in the compound.
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The body of a victim is discovered in the woods during a week with unusually cold weather. What should a forensic scientist consider when estimating the rate of decomposition of the body tissues of the victim?
The temperature would not need to be considered.
The tissues decompose at a slower rate at lower temperatures.
The tissues decompose at a faster rate at lower temperatures.
The tissues would not decompose at all at a lower temperature.
Answer:
The tissues decompose at a slower rate at lower temperatures.
Explanation:
This is my best guess but I think answer is tissue decompose slower rate at low temperature. This is why we in medicine we store specimens at very low temperature so we can do research on it at a later time but they eventually go bad. Low temperature slow down enzymes and proteins thus breakdown is slower rate.
What is the chemical formula of sodium phosphate?
The salt's chemistry is sodium phosphate. Na₃PO₄ Na3PO4 is the chemical name for sodium phosphate, and its molecular weight is 163.94 g/mol.
Is sodium phosphate N3PO4?
Sodium phosphate: Sodium phosphate, which has the chemical formula phospho soda Radiologists are familiar with Na3PO4 since it is frequently used as a cleanser before a double distinction barium enema.
Why is the sodium phosphate formula?
Na3PO4 is the chemical name for sodium phosphate, and its molecular weight is 163.94 g/mol.
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