Plant cells contain two elements: a cell wall and a cell membrane. In plants, the cell wall covers the cell membrane. This gives the plant cell its distinct rectangular shape.
For which cell types is the rubber band model best suited?A rubber band is a loop of rubber, usually a ring or oval, commonly used to hold multiple objects together.Elasticity: The molecular structure. of rubber materials allows them to return to their original shape after being compressed or stretched.This property is evident in rubber bands.Other rubber products may contain synthetic rubber, but most rubber bands are primarily made from natural rubber due to its excellent elasticity. Natural rubber is made from the milky sap obtained by tapping the bark layer of rubber trees.To learn more about rubber band from the given link:
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Which of the following options correctly express the relationship between the volume and temperature of a gas at constant pressure? Select al that apply. Check all that apply.
- As the temperature of the gas increases, the volume will increase. - There is an inverse relationship between volume and temperature. - VT is a constant value - The volume of the gas is directly proportional to the absolute temperature.
The correct relationship between the volume and temperature of a gas at constant pressure is the volume of the gas is directly proportional to the absolute temperature.
At constant pressure, as the temperature of a gas increases, the kinetic energy of its particles also increases, causing them to move faster and collide with the walls of the container with greater force. As a result, the volume of the gas increases. This relationship is described by Charles's law, which states that the volume of a fixed amount of gas at constant pressure is directly proportional to its absolute temperature. This relationship can also be mathematically described by the Ideal gas law, PV=nRT, where P is pressure, V is volume, T is temperature on the absolute scale, n is the number of moles of the gas and R is the ideal gas constant. When pressure is constant, we have PV = nRT, thus V = (nRT)/P = kT, where k is a constant. So, the volume of the gas is directly proportional to the absolute temperature.
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the mass of a gas molecule (or atom) can be computed from the specific heat at constant volume cv. given that the specific heat of argon is cv
The mass of a gas molecule (or atom) can be computed from the specific heat at constant volume . The mass of the gas is 6.6 × 10⁻²³ kg. The molar mass of the is 39.74 g/mol
The specific heat at constant volume, cv = 0.075 cal/g °C.
Cv = ( 3/2) R = ( 3/2) ( 1.98) = 2.98 cal /mol K
The molar mass, M = m / n = Cv / cv
= 2.9805/0.075
=39.74 g/mol
The mass = molar mass / Na
The mass = 38.74 / 6.023 × 10²³
The mass = 6.6 × 10⁻²³ kg
This question is incomplete, the complete question is :
The mass of a gas molecule (or atom) can be computed from the specific heat at constant volume cv. given that the specific heat of argon is cv is 0.075 cal/g °C for a gas and calculate (a) the mass of its atom and (b) the molar mass.
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when a 9.55 g sample of solid sodium hydroxide dissolves in 100g of water in a coffee cup caliometry
The delta H (in KJ/mole NaOH) for the solution (9.55g sample of solid NaOH (sodium hydroxide) dissolves in 100g of calorimeter in coffee-cup calorimeter, the temperature rises from 23.6 to 47.4 Celsius.) process = 31,204 kJ/mol
The specific heat capacity of a material is defined as the amount of heat (J) absorbed per unit mass (kg) when its temperature rises 1 K (or 1 °C), and its units are J/(kg K) or J/(kg °C).
Specific heat of water = 4.18 J/g °C
The total mass = 100 + 9.55 = 109.55 g
To determine the heat, use equation:
Q = mCΔT
Where:
Q = heat energy (Joule)
m = mass (kg)
C = specific heat (J/g°C)
ΔT = change in temp (°C)
Q = (109.55) x (4.18) x (47.4 - 23.6)
= 10,898 Joule
Moles of NaOH: mass / molar mass
= 9.55 / (23 + 16 + 1)
= 0.23
Enthalpy of reaction:
7177 / 0.23 = 31,204 kJ/mol NaOH
So, delta H (in KJ/mole NaOH) for the solution process = 31,204 kJ/mol
The question is incomplete, it should be:
When 9.55g sample of solid NaOH (sodium hydroxide) dissolves in 100g of calorimeter in coffee-cup calorimeter, the temperature rises from 23.6 to 47.4 Celsius. Calculate Delta H (in KJ/mole NaOH) for the solution process. Assume that the specific heat of the solution is the same as that of pure water.
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Base your answers to the questions on the two chemical reactions shown. Letter B represents?a. glycerol moleculeb. monosaccharidec. dipeptide moleculed. polymer
Based on the picture, the letter B represents monosaccharide.
Maltose is a carbohydrate compound belonging to disaccharides, namely carbohydrates composed of two monosaccharide molecules. Maltose is a disaccharide that is produced when amylase breaks down starch. It is found in germinating seeds such as wheat. It is also produced when glucose is burned. Maltose is a reducing sugar because it can reduce Fehling, Benedict, or Tollens reagents.
In the figure, there are pores of maltose hydrolysis. Maltose hydrolysis will produce two glucose units using the enzyme maltase catalyst or acid catalyst. So, the hydrolysis of maltose in an acidic environment produces glucose. Glucose is a monosaccharide (simple sugar).
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identify the correct statement below. multiple choice you are not allowed to eat, but you can drink beverages in the lab. it is alright to bring a beverage into the lab as long as it is kept closed. food and beverages should never be consumed or brought into the lab. you are allowed to eat on the lab bench as long as you sterilize it with ethanol first.
You are not permitted to eat in the lab, but you may consume beverages. Eating and drinking are permitted in the laboratory as long as there are no open cultures on the bench top.
A laboratory is a controlled environment in which scientific or technological research, experiments, and measurements can be carried out. Laboratory services are available in a variety of settings, including doctors' offices, clinics, hospitals, and regional and national referral centres.
The various requirements of the specialists working within laboratories determine the organisation and content of laboratories. A physics laboratory might have a particle accelerator or a vacuum chamber, whereas a metallurgy laboratory might have equipment for casting, refining, or testing metal strength. A wet laboratory may be used by a chemist or biologist, whereas a psychologist's laboratory may be a room with one-way mirrors and hidden cameras to observe behaviour.
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A student titrates 10.0 g of his borax solution with 3.00 M sulfuric acid, requiring 182 microliters of the acid
to reach the equivalence point. Calculate the mass percent of the borax solution.
we can remember swimming in december, heading for the city lights in 1975, we share in each other, nearer than farther, the scent of a lemon drips from your eyes we are the people that rule the world. a force running in every boy and girl, all rejoicing in the world, take me now, we can try. we lived an adventure loved in the summer, followed the sun till night reminiscing other times of life, for each every other the feeling was stronger, the shock hit eleven got lost in your eyes i can't do well when i t
"We Are The Sun". Child looking at the moon. Just looks like the sun. These are the days. Some things don't change.
Summer, followed the sun till night reminiscing other times of life?
The song was also used in the 2011 films The Roommate and Hall Pass, as well as in episode 11 of season 6 of Entourage.Based on J. G. Ballard's autobiographical novel, tells the story of a boy, James Graham, whose privileged life is upturned by the Japanese invasion of Shanghai, December 8, 1941. Separated from his parents, he is eventually captured, and taken to Soo Chow confinement camp, next to a captured Chinese airfield.Empire of the Sun are an Australian electronic music duo formed in 2007. The duo is a collaboration between Luke Steele, of alternative rock band The Sleepy Jackson, and Nick Littlemore, of electronic dance band Pnau.
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Explain why the name shown below is incorrect for the compound MgCl,?
Name: Magnesium Dichloride
The name "Magnesium Dichloride" is incorrect for the compound MgCl2 because the compound is not composed of magnesium and chlorine only in a 1:1 ratio. The compound is actually composed of one Magnesium atom (Mg) and two Chlorine atoms (Cl2).
The correct name for the compound MgCl2 is Magnesium Chloride, which describes the chemical formula accurately. The prefix "di-" refers to two atoms and is used when there are two atoms of the same element in a compound, In this case, there are two chlorine atoms in MgCl2.
to complete the following biochemical reaction, how much dissolved oxygen in mg/l is needed for a solution containing 1 mg/l of ch2o?
In the following biochemical reaction, the dissolved oxygen in mg/l is needed for the solution containing 1 mg/l of CH₂O is 1 mg /L.
The reaction is given as :
CH₂O + O₂ ----> CO₂ + H₂O
The molar mass of CH₂O = 30 g/mol
The molar mass of O₂ = 32 g /mol
1 mole of O₂ react with 1 mole of CH₂O
30 g CH₂O react with 32 O₂
so, 1 mg / L of CH₂O require = (32 / 30 ) × 1 mg/L
1 mg / L of CH₂O require = 1.0 mg/L of oxygen.
Thus, the oxygen needed is 1.0 mg/L .
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162 grams of copper reacts with 17 grams of oxygen in order to produce copper (II) oxide in a synthesis reaction. How much copper (II) oxide is made
Answer: 179 grams
Explanation:
In a chemical reaction, the law of conservation of mass applies, meaning that the total mass of the reactants is equal to the total mass of the products. In this case, the reactants are 162 grams of copper and 17 grams of oxygen, and the product is copper (II) oxide. Using the balanced chemical equation 2Cu + O2 -> CuO, we know that 1 copper atom reacts with 1 oxygen molecule to form 1 copper oxide. Therefore, the mass of copper oxide produced is equal to mass of copper plus mass of oxygen, which is 162g + 17g = 179g.
nucleic acids (dna and rna) are polymers of nucleotides. the structural backbone of nucleic acids contains the following repeating pattern:
Nucleic acids (DNA and RNA) are polymers of nucleotides, the structural backbone of nucleic acids contains "Phosphate - Sugar - Phosphate - Sugar'' repeating pattern.
In both RNA and DNA, every nucleotide has the same basic structure. This structure consists of a phosphate group that is bonded to a pentose sugar via a phosphodiester bond and that is then connected to an organic base.
Ribose is found in RNA, and deoxyribose is found in DNA. Both of these sugars are pentoses. In DNA, the organic bases are A, G, C, and T; in RNA, they are A, G, C, and U. (adenine stands for adenine, guanine for guanine, cytosine for cytosine, thymine for thymine, and uracil for uracil). The structural backbone of nucleic acids contains "Phosphate - Sugar - Phosphate - Sugar'' repeating pattern.
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Need help with this please
Gaseous ammonia chemically reacts with oxygen gas to produce nitrogen monoxide gas and water vapor. Calculate the moles of oxygen needed to produce 1.6 mol of nitrogen monoxide. Be sure your answer has a unit symbol, if necessary, and round it to the correct number of significant digits.
2 moles of oxygen have been necessary to start producing 1.6 moles of nitrogen monoxide.
Describe nitrogen.Nitrogen, sometimes known as N, is an element that has no taste or color. Nitrogen can be found in the air we breathe, the liquids we drink, and the floor beneath our feet. In fact, nitrogen has been the most common element in the stratosphere, accounting up 78% of it.
How does nitrogen become made?The atomic number of the alkali metal nitrogen is seven, and its nucleus has seven protons. Single - molecule nitrogen is a chemical compound made up of two tightly bound nitrogen atoms (N2). Isolated nitrogen is a clear, odorless, unpalatable, and inert gas at ordinary temperatures and pressure.
The mole ratio,
O₂ : NO = 5:4
= 5 / 4 * 1.6
= 8 / 4
= 2 mol
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HELPPPP
Air flows according to differences in thermal energy.
If a warm air mass is located in the southwest United States and a cold air mass is located in the southeast United States, from which direction will the winds blow?
south
north
west
east
IT WAS WEST
The wind is going to move to the west due to convection.
Why would the wind blow west?We have to know something about the convection current of a fluid. Let us note that when convection is taking place, there would be the movement of the warm fluid upwards while the cool fluid would move downwards.
We are told that a warm air mass is located in the southwest United States and a cold air mass is located in the southeast United States.
This is why there would be the movement of the warm air mass towards the west and this is due to the convection of the air mass as discussed here.
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_______ capacity is a term used to describe the ability of a solution to prevent large changes in pH with the addition of a base or acid.
a) Heat
b) Buffering
c) Vaporization
d) Cohesive
e) Freezing
Buffering capacity measures a solution's capability to withstand pH fluctuations by either absorbing as well as desorbing H+ as well as OH- ions.
Aqueous buffer solutions were made up of a weak acid as well as its conjugate base or even a weak base as well as its conjugate acid. The capability of buffer solutions to keep a fairly constant pH value in reaction to the addition of a tiny amount of acid or base is an important attribute.
A buffer would be a solution that avoids pH changes when a minuscule portion of strong acid as well as strong base is added. Technical definition (How does one come up with one?): A buffer was made up of a weak acid and its conjugate base.
Thus, the correct answer will be option (b).
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is the liter value for titration molarity calculation the difference between the final and inital values
NaOH has ais a liter value for titration molarity of 1 mole.
Molarity-
The amount of a substance in a specific volume of solution is known as its molarity (M). The number of moles of a solute per liter of a solution is known as molarity. The molar concentration of a solution is another term for molarity.
If you know how many grams of NaOH is dissolved in a known amount of solvent, you can use the formula below to calculate its molarity.
The molarity of NaOH is determined, for instance, when 10 gm of NaOH is dissolved in 250 ml of water.
Molarity is calculated as (Weight of NaOH taken*1000)/(250*NaOH's molecular weight).
Molarity equals (10*1000)/(250*40).
NaOH has a molarity of 1 mole.
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The full question-
How do you calculate the molarity of NaOH?
In an experiment to find the number of molecules of water of crystallization in sodium sulfate crystals,Na2SO4•nH2O,3.22g of sodium sulfate crystals were heated gently.When all the water of crystallization had been driven off, 1.42g of anhydrous soduim sulfate was left. Find the value for n of the formula
The value of n of the formula, Na₂SO₄•nH₂O is 10
How do I determine the value of n in the formula?To obtain the value of n in the formula, we shall determine the formula of the hydrate. Details below:
Mass of hydrate, Na₂SO₄•nH₂O = 3.22 gMass of anhydrou, Na₂SO₄ = 1.42 gMass of water, H₂O = 3.22 - 1.42 = 1.8 gFormula =?Divide by their molar mass
Na₂SO₄ = 1.42 / 142 = 0.01
H₂O = 1.8 / 18 = 0.1
Divide by the smallest
Na₂SO₄ = 0.01 / 0.01 = 1
H₂O = 0.1 / 0.01 = 10
Thus, the formula of the hydrate is Na₂SO₄•10H₂O
Comparing the formula of the hydrate, Na₂SO₄•10H₂O with this Na₂SO₄•nH₂O, we can see that the value of n is 10
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Does anyone know these answers?
Answer:
Explanation:
Na & I -> NaI (Sodium iodide)Be & Br -> BeBr2 (beryllium bromide)Ca & S -> CaS (Calcium sulfide)Ca & N -> Ca3N2 (Calcium Nitride)Al & P -> AlP (Aluminum phosphide)Al & Te -> AlTe (Aluminum telluride)K & O -> KO (Potassium oxide)Na & S -> Na2S (Sodium sulfide)Sr & Cl -> SrCl2 (Strontium chloride)Sr & S -> SrS (Strontium sulfide)Al & F -> AlF3 (Aluminum fluoride)Mg & S -> MgS (Magnesium sulfide)Rb & Se -> RbSe (Rubidium selenide)Al & O -> Al2O3 (Aluminum oxide)Ba & P -> Ba3P2 (Barium phosphide)It is important to note that these compounds are formed by ionic bonding where the metal atom loses electrons to form a positive ion ( cation) and the non-metal atom gains electrons to form a negative ion (anion). The cation and anion combine to form a neutral compound.Also, the nomenclature of these compounds follow the IUPAC rules, which have a set of conventions to name compounds based on the elements present and their oxidation states, and the number of atoms of each element in the compound.
the chemical characteristics of transported substances impact the type of diffusion that will be used by the cell. sort the following chemicals by the type of transport required to move them down their gradient.
The chemical characteristics of transported substances impact the type of diffusion that will be used by the cell.
What are the the chemical characteristics of transported substances ?
There are two main types of carrier-mediated transport systems: (1) Facilitated Diffusion and (2) Active Transport. Mediated transport has 3 key characteristics: a) specificity, b) saturation and c) competition.The types of substance transport across the cell membrane may be classified, by taking into account the size of the particles, into two categories: (a) macrotransport of relatively large quantities of solution, molecular complexes, or even other cells, and (b) microtransport of ions, small molecules and macromolecules.Transport across the plasma membrane occurs unaided in simple diffusion, i.e., molecules of gases such as carbon dioxide and oxygen, as well as small molecules like ethanol, enter the cell by crossing the cell membrane without the assistance of any permease.To learn more about Transport refers to:
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a is a concise statement that summarizes observed behaviors and observations and predicts future observations.target 1 of 3 a is a tentative interpretation or explanation of the observed phenomena.target 2 of 3 a attempts to explain why the observed behavior is happening.
The fill in the blanks is given below as :
a) Law
b) Hypothesis
c) Theory
a) A Law is a concise statement that summarizes the observed behaviors and the observations and predicts future observations.
b) A hypothesis is a tentative interpretation or the explanation of the observed phenomena. The hypothesis is the presumption of that hasn't been proven yet or the verified but still need to evaluated through the test.
c) A theory is a attempts to explain that why the observed behavior is happening. The theory is the principle that explains the events that has already been investigated.
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For granulocyte concentrations, all of the following lab tests must be performed on the unit by the donor center except? A.) ABO and RH
B.) Red Cell antibodies
C.) Infectious disease markers
D.) Lymphocyte enumeration
For granulocyte concentrations, all of the following lab tests must be performed on the unit by the donor center except lymphocyte enumeration.
Granulocytes are immune cells with granules (small particles) containing enzymes that are released during infections, allergic reactions, and asthma attacks. Granulocytes include neutrophils, eosinophils, and basophils. Granulocytes are specialized white blood cells. On the other hand, lymphocytes are a type of white blood cells (leukocytes) which are agranulocytes - meaning, that they lack presence of granules in their cytoplasm - they are not granulocytes. Lymphocytes constitute of B and T cells. Lymphocyte enumeration is an assay designed for enumerating the percent and absolute cell counts of lymphocyte subsets in lysed whole blood. Antibodies which are specific for certain cell surface antigens present on the lymphocytes, are labeled with fluorochromes. When whole blood sample and these labelled antibodies are added together, these antibodies bind to the targeted antigens on the lymphocytes. Following incubation, lysing and fixation, absolute count and percentage count are enumerated utilizing an internal quantitation standard.
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which of the following diagrams represent a bonding molecular orbital? please choose all correct answers.
The given diagram represents the bonding molecular orbital with 2 pi bonds overlapping laterally.
The bonding orbital term is used in the molecular orbital theory or the MO theory which is used to describe the attractive interactions which occur between the atomic orbitals of two or more than two atoms in a molecule.
There are two types of molecular orbitals namely the bonding molecular orbitals and the antibonding molecular orbitals. Bonding molecular orbitals are types of molecular orbitals which are involved in the formation of the chemical bonds whereas the antibonding molecular orbitals are the orbitals which contain the electrons that are present outside the region which is there between two atomic nuclei.
In the given diagram, there is a lateral overlap of two pi bonding molecular orbitals.
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how many significant figures are in each of the following measured quantities? drag the appropriate items to their respective bins.
The rules for deciding which digits in a measurement are significant are as follows: Rule 1: All nonzero digits in a measurement are significant.
What are measured quantities?
In physics, there are seven fundamental physical quantities that are measured in base or physical fundamental units: length, mass, time, electric current temperature, amount of substance, and luminous intensity.Measured quantities are typically expressed in number (e.g door handles), length (e.g handrails, kerbs), area (e.g floor tiles, plaster), volume (e.g concrete) or weight (e.g gravel).In the International System I of Units, there are seven base units: kilogram, meter, candela, second, ampere, kelvin, and mole.The choice of which physical quantities are taken as fundamental is somewhat arbitrary, but the three usually selected are length, time, and mass.To learn more about quantities refers to:
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Below are some of the molecular orbitals for benzene. How many vertical nodal planes are there in each?
There are two vertical nodal planes in each of the molecular orbitals for benzene.
Molecular orbitals of benzeneThe molecular orbitals of benzene are composed of overlapping p orbitals of the carbon atoms. These molecular orbitals include:
The highest occupied molecular orbital (HOMO)The lowest unoccupied molecular orbital (LUMO)Each of these molecular orbitals contains two vertical nodal planes, which are planes of zero electron probability that divide the orbital into two lobes. The vertical nodal planes occur perpendicular to the plane of the hexagonal ring of benzene, and they separate the two lobes of the orbital. The two lobes are of equal size, and they are located on opposite sides of the nodal plane. As a result, the two vertical nodal planes form a cross-sectional cut of the molecular orbital.
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a 17-year-old boy is brought to the emergency department by his friends. they were at a house party and found their friend unconscious after he ingested an unknown substance. on physical exam, vital signs are temp 96f, heart rate 50, respiratory rate of 4, and oxygen saturation 92% on room air. the boys pupils are miotic. on lung auscultation, there are crackles bilaterally. you administer supplemental oxygen. which of the following is the most appropriate clinical intervention?
The opiate toxidrome of miosis and CNS depression, & hypoventilation is frequently followed in the clinical diagnosis of heroin intoxication. QT prolongation has been diagnosed.
What are the uses of oxygen?The energy-producing process that powers the metabolic rates of most living organisms, respiration, depends heavily on oxygen. All living things, including humans, depend on the air that we breath to survive.
What is the ideal oxygen source?The oceans provide roughly a fifth of the oxygen on Earth, and marine life uses a similar proportion. Photosynthetic plankton are abundant in the ocean's top layer. They create more nitrogen than the biggest redwoods, yet being imperceptible to the sight.
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How does a magnetic field change as you move away from a magnet? At what point does it end?
Answer:
The strength of the magnetic field is inversely proportional to the distance from the current carrying conductor. That is, as the distance increases the magnetic field decreases.
A watershed is an area of land that catches precipitation and drains to rivers and lakes.
Which of the following conclusions can be drawn about the quality of water in the
watersheds of the United States in 2000?
O A. Contaminated water in watersheds is a serious problem around the world.
B. Over 50% of the water in watersheds may pose a health risk.
C. The EPA (Environmental Protection Agency) need not be concerned.
D. More than 75% of the water in the watersheds is dangerously polluted.
E. It is very difficult to analyze water in watersheds.
Answer:
I'm not sure but I think it is B. Over 50% of the water in watersheds may pose a health risk. I'm not sure but I think it is B
4. write a complete arrow-pushing mechanism for the following reaction under acid- catalyzed conditions
Acid- catalyzed dehydration of alcohols will yield alkenes.
It is an elimination reaction in which water is removed from a compound. It is important for converting alcohols into alkenes. So acid catalyzed dehydration is the dehydration reaction of alcohols to generate alkene proceeds by heating the alcohols in the presence of a strong acid, such as phosphoric or sulfuric acid, at high temperatures.
During the process of acid-catalyzed dehydration, alcohols will experience either E1 or E2 mechanisms that will result in them losing water and thus forming a double molecular bond. Primary alcohols experience bimolecular elimination called E2 mechanism under this process, while secondary as well as tertiary alcohols experience unimolecular elimination or E1 mechanism.
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1. observe : experiment with a hollow pipe of gold and a solid chunk of gold separating the flasks. compare how quickly heat is exchanged
The heat will remain constant.
Here, we know that both the bodies are made up of same material, hence its orientation will not affect its expansion.If you provide heat to a body or remove heat from a body, the temperature of that body will increase or decrease respectively.Change in temperature of the body depends upon the nature of its material and the amount of heat supplied.As both the bodies are of gold, the heat will remain constant.Go through the given link below to know more about heatheat:-
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for the pair of compounds ch3oh c h 3 o h or h2co h 2 c o the one with the higher vapor pressure at a given temperature is ____.
For the pair of compounds CH3OH and H2CO, the one with the higher vapor pressure at a given temperature is CH3OH.A substance's propensity to transform into a gas.
at a specific temperature is measured by a substance's vapor pressure. The likelihood of a material being in the gaseous form at a given temperature increases with increasing vapor pressure.More volatile than H2CO is the molecule CH3OH. A hydroxyl (-OH) group, a polar group, is bonded to the carbon atom in CH3OH, a primary alcohol. Due to greater intermolecular interactions, such as hydrogen bonding, made possible by CH3OH's polarity, such as higher boiling points and lower vapor pressures.At normal temperature, formaldehyde, commonly known as H2CO, exists as a gas with a greater vapor pressure than CH3OH.Remember that vapor pressure is a function of temperature.
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