The overall charge of an atom or ion is negative if the number of electrons is greater than the number of protons.
What is electron?A subatomic particle with a negative charge is called an electron. It is found outside the nucleus of an atom and is one of the main constituents of matter. Electrons are responsible for the chemical properties of atoms and thus play an important role in chemical reactions. Electrons have low mass and move around the nucleus at relativistic speeds. They are also responsible for the electrical and magnetic properties of atoms, and for the transmission of light and other forms of energy. Electrons can also interact with other particles and form complex structures, such as molecules.
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In the last minute rush to assemble the demonstration, your teacher spills the lead chloride all over their sandwich and is left with 57.2 grams in the bottle. How much potassium iodide should be weighed out to convert all of the lead chloride to product?
7. What is one of the BEST actions the US government can take to slow global warming?
-provide tax credits to those who carpool
-encourage people to buy electronic books versus paperbacks or hardbacks
-produce commercials that urge people to recycle
-invest in clean technologies such as wind and solar power
one of the BEST actions the US government can take to slow global warming is invest in clean technologies such as wind and solar power
What is the US government doing about global warming?EPA works with industry and others to reduce greenhouse gas emissions through regulatory initiatives and partnership programs. Within the Agency, EPA implements a range of strategies to reduce its own greenhouse gas emissions, increase energy efficiency, and take other steps to reduce its carbon footprintReaching 100% carbon pollution-free electricity by 2035. Achieving a net-zero emissions economy by 2050. Delivering 40% of the benefits from federal investments in climate and clean energy to disadvantaged communitiesMobilizing a whole-of-government approach, the United States is scaling up action at home and abroad to put the world on a path to reach net-zero emissions by 2050 and to achieve the global goal on adaptation. Learn more about the United States at COP27 and the U.S. Center
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What is the relationship between CO2 levels and sea levels?
The relationship between the CO₂ and the sea levels is the carbon dioxide is higher about 10 % at deep ocean than the surface.
This warms world due to the greenhouse gases that included the carbon dioxide , the water heat up and it expands due to which the sea level rises. if we remove the extra heat from the ocean that caused by the short lived gases , it lowers the sea levels and this process is very slow.
The carbon dioxide that dissolves in the ocean will cause the sea water to be acidify. this will harmful for the shellfish and the corals.
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A 325 0 g piece of gold at 427 degree C is dropped into 200.OmL of water at 22 0 degree C. Calculate the final temperature of the mixture. Specific Heat of gold
The final temperature of the mixture is 218.1°C.
The Specific Heat of gold 0.0123 J.
What is specific heat ?Specific heat is known to be the amount of energy required to raise the temperature of a unit mass of a substance by 1 degree. It is a physical property of matter, usually expressed in units of Joules/Kilograms/Kelvin (J/kgK).
Mass of gold = 325 g
Heat absorbed by water = mass of gold x specific heat x temperature change
325 x 0.128 x 405
Heat absorbed by water = 154,400 J
Heat capacity of water = mass of water x specific heat
200 x 4.184
Heat capacity of water = 836.8 J/degree Celsius
Final temperature = (heat absorbed by water ÷ heat capacity of water) + Initial temperature
Final temperature = (154400 ÷ 836.8) + 22
Final temperature = 218.1°C
Q = mcΔT
836.8 J/°C = 325 × c × (427°C - 218.1°C)
836.8 J/°C = 325 × c × 208.9
c = 836.8/(325 × 208.9)
c = 836.8/67,892.5
c = 0.0123 J
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Which is true of an atom? A. The valence electrons make up the majority of the mass and volume of an atom. B. The electron cloud makes up the majority of the mass and volume of an atom. C. The valence electrons make up the majority of the mass of an atom but do not take up much volume. D. The electron cloud makes up the majority of the volume of an atom but does not have much mass
The statement that is true about an atom is D. The majority of volume of an atom is make up by the electron cloud which has no mass.
In an atom, there are three sub-atomic particles that are protons, electrons and neutrons. The protons and neutrons are present inside the nucleus while the electrons revolve around the orbits i.e., circular orbits. The majority of volume of an atom is make up by the electron cloud which has no mass. Electrons are negatively charged in nature while the positive species are protons and neutrons carry no charge in them. The circular path is termed as orbits in which electrons revolve.
Thus, option D is the correct choice.
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Explain the reason why you tested electrical conductivity with a solution containing both methanol and water.
In comparison to non-polar hydrocarbon dielectrics like gasoline and diesel fuel, methanol is a polar substance like water and has a relatively high conductivity (conductivities less than 1 x 10⁴ pS/m).
Does methanol have a higher conductivity than water?Therefore, the self dissociation into ions for methanol and ethanol will be less strong than in water. But even in pure ethanol and methanol solutions, these ions will still exist and conduct electricity, albeit at very low conductivities.
Water's electrical conductivity is a measure of how well it can carry a current of electricity. The amount of electrical current that can be conducted in water increases with the concentration of dissolved charged chemicals, also referred to as salts.
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H+ ions increase in concentration at lower pH values. Calculate how many more H+ ions there are in a solution at a pH = 2 than in a solution at a pH = 6. Find the concentration of H+ ions at a pH = 2 and at a pH = 6 in Table B. Then divide the concentration of H+ ions at a
pH = 2 by the of H+ ions at a pH = 6. Record your answer in Table C.
What is the concentration of H+ ions at a pH = 2?
mol/L
What is the concentration of H+ ions at a pH = 6?
mol/L
How many more H+ ions are there in a solution at a
pH = 2 than in a solution at a pH = 6?
need ASAP give
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The number of hydrogen ions, H⁺, that are there in a solution at a
the pH of 2 than in a solution at a pH of 6 is 1000 or 10⁴.
What is the pH of a solution?The pH of a solution is the negative logarithm in base 10 of the hydrogen ion concentration of the solution.
pH = - log [H⁺]
Hence, the hydrogen ion concentration of a solution whose pH is given is determined using the formula given below as follows:
[tex][H^{+}] = 10^{-pH}[/tex]
For the solution of pH of 2
[H⁺] = 10⁻²
[H⁺] = 0.01 M
For the solution of pH of 6
[H⁺] = 10⁻⁶
[H⁺] = 0.000001 M
The ratio of the hydrogen ion concentration of the solutions will be:
Ratio of hydrogen ions = 0.01 / 0.000001 M
Ratio of hydrogen ions = 10000 or 10⁴
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What are the types of chemical bonds? Describe each.
What are the composite units of each type of solid? What types of forces hold each type of solid together? Match the items in the left column to the appropriate blanks in the sentences on the right. Reset Help nonbonding Molecular solids are those solids whose composite units are together by the following kinds of intermolecular forces: Molecular solids are held bonding coulombic forces and hydrogen lonic solids are those solids whose composite units are Ionic solids are held together Individual atoms by dispersion forces network covalent dispersion forces, dipole- dipole forces Atomic solids are those solids whose composite units are Atomic solids can themselves bo divided into three following categories, where each is held together by a different kind of force. The first category, which includes only the noble gases in their solid form and is held together by relatively weak atomic solids. The second category, which is held together by bonds and includes such examples as copper or silver, is atomic solids. The last category, which is hold together by and includes such examples as diamond, graphito, and silicon dioxide, is atomic solids ions metallic molecules covalent bonds lon-dipole forces
Solids known as molecular solids are made up of molecules. Intermolecular forces such as hydrogen bonds, dipole-dipole forces, and dispersion forces hold together molecular solids. Solids with ions as their constituent parts are known as ionic solids. Ion-dipole forces keep ionic solids together.
Atomic solids are those whose constituent atoms make up their entire structure. Atomic solids can be broken down into the three categories below, each of which is held together by a distinct set of forces. Dispersion forces atomic solids is the first category, which only consists of noble gases in their solid states and is held together by coulombic forces that are comparatively weak. Metallic atomic solids fall under the second category, which is held together by nonbonding bonds and contains substances like copper and silver as examples. Network covalent atomic solids are the final group of materials that are held together by covalent bonds and include materials like silicon dioxide, graphite, and diamond.
What five intermolecular forces exist?Intermolecular forces can be divided into three categories: hydrogen bonds, dipole-dipole interactions, and London dispersion forces (LDF). Despite the fact that molecules can have any combination of these three types of intermolecular forces, all substances at least have LDF.
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18) Write the expression: the sum of the quantity h and 2 divided by 4. A) h 4 2 B) h 2 4 C) h 2 4 D) 4 h 2
The expression is [tex]\frac{(h+2)}{4}[/tex] which can be solved by BODMAS rule
The abbreviation BODMAS, which stands for "Brackets, Order of powers or roots, Division, and Multiplication," is followed by the BODMAS rule. A stands for addition and S for subtraction. According to the BODMAS rule, multi-step mathematical statements must be solved in the BODMAS order from left to right. Similar to how Addition and Subtraction depend on which comes first in the sentence, Division and Multiplication are thought of as interchangeable operations.
The expression can be written as follows WE have 2 quantities h and 2
Their sum can be written as h+2 Now We have the sum divided by 4 so it can be written as : [tex]\frac{(h+2)}{4}[/tex]
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Where do the 2 ATP produced in fermentation come from?
Glycolysis during fermentation only yields two ATP each glucose molecule, which is significantly less ATP than is produced during respiration.
What distinguishes a compound from a molecule?A collection of more than two atoms joined by chemical bonds is referred to as a molecule. The compound is a mixture made up of two or more distinct kinds of elements that are chemically combined in a predetermined ratio. Not every molecule is a compound. Molecules make up all chemicals.
Just how many atoms make up a molecule?According to the context, it term might or might not include ions that meet this requirement. A molecule is a collection of atoms that are held together by the attractive forces called as chemical bonds.
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Which action characterized Earth's earliest atmosphere (atmosphere I) ?
Helium and hydrogen gases escaped earth's gravity.
Increased oxygen allowed reptiles to thrive.
Heat energy was retained and water vapor condensed.
Ultraviolet light split water vapor into hydrogen and oxygen
The action "Heat energy was retained and water vapor condensed." characterized Earth's earliest atmosphere (atmosphere I)
Earth's earliest atmosphere, also known as atmosphere I, was primarily composed of methane, ammonia, and water vapor. The heat energy from the young Earth's molten surface caused these gases to rise and cool, leading to the condensation of water vapor and the formation of oceans. This process is known as the "greenhouse effect," as the retained heat energy allowed for the formation of a hospitable environment for the emergence of life. Ultraviolet light from the sun also played a role in the formation of the atmosphere by breaking down water vapor into hydrogen and oxygen, but this was not the primary process that characterized atmosphere I.
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A bleaching solution requires 6. 55 g of sodium hypochlorite. How many grams of a 21. 5% by mass solution of sodium hypochlorite should be used
A bleaching solution requires 6. 55 g of sodium hypochlorite. 30.47 grams of a 21. 5% by mass solution of sodium hypochlorite should be used
Mass of sodium hypochlorite = 6.55 g
percent composition = 21. 5%
This indicates that there are 21.5 grams of sodium hypochlorite present in every one hundred grams of solution.
Now calculate the number of grams of solution for 6.55 g of solution.
(6.55 g x 100) / 21.5 g = 30.47 g
Therefore, you will need 30.47 grams of a sodium hypochlorite solution that has a mass concentration of 21.5% in order to obtain 6.55 grams of sodium hypochlorite.
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Benzene is a liquid with molecular formula C6H6
Ethene is a gas with molecular formula C2H4
Which statement is correct?
A 1 mole of benzene and 1 mole of ethene contain the same number of atoms.
B 1 mole of benzene and 1 mole of ethene both have a volume of 24 dm³ at room temperature and pressure.
C Both benzene and ethene have the same empirical formula.
D The number of carbon atoms in 0.5 moles of ethene is equal to the Avogadro constant.
And why is it that way?
Answer:
Benzene is a hydrocarbon with molecular formula of C6 H12 including 3πbond which are rotating
benzene is also a aromatic but ethene is not a aromatic
Explanation:
Answer: No, one mole of benzene (C6H6) and one mole of ethene (C2H4) will have the same number of molecules (6.02x10^23 benzene molecules and 6.02x10^23 molecules of ethene). However, one molecule of benzene consists of 12 atoms, while one molecule of ethene consists of 6 atoms.
A 15.0-mL sample of 0.100 M Ba(OH)2 is titrated with 0.125 MHCl.
Calculate the pH for different points throughout the titration curve and make a sketch of the curve.
The pH of a 0.100 M Ba(OH)2 solution is decreased to 6.51 when 15.0 mL of 0.125 M HCl is added. The titration curve of the reaction is a decreasing graph, with the pH decreasing as the volume of the HCl added increases.
Volume of HCl Added (mL) | pH
--------------------------|-----
0.0 | 12.32
2.5 | 10.98
5.0 | 9.81
7.5 | 8.79
10.0 | 7.94
12.5 | 7.18
15.0 (endpoint) | 6.51
The pH of a 0.100 M Ba(OH)2 solution is decreased to 6.51 when 15.0 mL of 0.125 M HCl is added. The titration curve of the reaction is a decreasing graph, with the pH decreasing as the volume of the HCl added increases.
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A compound is composed of carbon and hydrogen and has an empirical
formula of CH. The molar mass of the compound is experimentally
determined to be 78.12 g/mol. What is the molecular formula for the
compound?
A compound has the empirical formula CH and is made up of carbon and hydrogen. the compound's molecular formula is C6 H6.
How is a molecular compound identified?Compounds that involve a metal binding with a non-metal or a semi-metal will typically exhibit ionic bonding. Molecular compounds are those whose only non-metals or semi-metals contain non-metals. These compounds exhibit covalent bonding.
The compound with the lowest whole number ratio can be found in its empirical formula.
The empirical formula for weight is 12+1=13,
while the molecular formula for weight is 13 78 = 6.
The molecular formula for weight is (CH)n = (CH)6 =C6 H6.
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the formula for the selenate ion is seo42−. predict the formula for selenic acid.
Answer:
The formula for selenic acid is H2SeO4.
Explanation:
Selenic acid is an oxoacid of selenium, which means that it contains selenium and oxygen atoms bonded together in a compound that also contains hydrogen atoms. The selenate ion, which has the formula SeO42-, is an ion that contains selenium and oxygen atoms bonded together. Based on these facts, we can predict that the formula for selenic acid will contain selenium, oxygen, and hydrogen atoms.
To determine the specific ratio of atoms in the formula for selenic acid, we can look at the valences of the elements involved. The valence of an element is the number of bonds it can form with other atoms. Selenium has a valence of 6, oxygen has a valence of 2, and hydrogen has a valence of 1.
Since selenium has a valence of 6, it can bond with 6 oxygen atoms. This means that selenic acid will contain at least one selenium atom bonded to 6 oxygen atoms. In addition, selenic acid will contain hydrogen atoms, which can bond with oxygen atoms. Based on these considerations, we can predict that the formula for selenic acid will be H2SeO4, which contains one selenium atom bonded to 6 oxygen atoms and 2 hydrogen atoms.
Which represents the greatest mass?
• all the same
• 1.0 mol P
• 1.0 mol I
• 1.0 mol K
• 1.0 mol Al
Answer:
it is 1 mole of I is correct
Express the answers to the following operations with the proper number of significant figures.
4. 108 x 5. 3
____ X 10^
The answer to the given operations with proper number of significant figures is 5.7 × 10².
Significant figures or numbers can be defined as those particular numbers or digits which are essential in determining the accuracy of a particular value. For example, 4.392 has 4 significant figures.
When we are rounding off a number to write it with the proper number of significant figures, we first need to decide the amount of significant figures that it should have.
On calculating the given operation,
⇒ 108 × 5.3 = 572.4
In significant figures,
= 5.72 × 10²
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What happens to the energy put into the ice maker? (What is it used to do? How
is it transformed or transferred?)
Answer:
When ice or any other solid melts, its potential energy increases. Indeed, this is the only increase in energy, since the thermal kinetic energy, or temperature, does not increase while melting. Potential energy is the latent energy that could be released by the water, and this increases because the water will release heat energy if it is frozen solid again.
Ice is the lowest energy state of water at normal Earth pressures. At each phase change of water, whether ice to liquid water or liquid water to water vapor, the potential energy decreases. This is due to the Law of Conservation of Energy. Materials undergoing a change of state absorb or release heat energy, but their temperatures do not change. This is because, while the state change is occurring, all the heat energy is converted into the potential energy of the new state of matter.
Water, in particular, has a very large change in potential energy during phase changes. It takes a great deal of energy to change water from one state to another. This is because of the strong hydrogen bonds that form between water molecules. The liquid phase allows water molecules to be in contact with each other, while the solid phase puts water molecules in an overall optimal configuration relative to each other.
Explanation:
What is the relative rate of diffusion of CH4 and NO2?
Answer:
=32×1632×√1632=34√2.
Explanation:
16% of m is 28
16% x m = 28
0.16 x m = 28
m = ...
Answer:
m=175
Explanation:
100/16 = 6.25
6.25x28 = 175
Answer: To solve this equation for m, you can divide both sides of the equation by 0.16. This will give you:
m = 28 / 0.16
Simplifying the right side of the equation gives:
m = 175
Therefore, m = 175.
Explanation:
Why is the mass of one mole of carbon (C) less than the mass of one mole Oxygen (O), even though the number of atoms of each element is the same
Chemistry quizzes What is the mass of a single carbon atom if a mole of carbon atoms weighs 12 grams. The fact that 1 mole of carbon atoms weighs 12 grams is a given.
There are 6. 022 10 23 atoms in total, or Avogadro's number, in a mole of carbon atoms. As a result, 1 carbon atom weighs 2 10 - 23 g (in grams). The weight of one mole of carbon atoms is 12 g. 12 g to 12 amu. Because we defined the mole to make it so, the atomic mass and molar mass are in agreement. A material can have a variable mass per mole while yet having the same number of particles. Are there any examples you might use to support the claim? In current usage, the term "mole" merely denotes a group of countable items, more specifically the Avogadro number of the entities in question.
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We observe that 0.123 mole of the element bromine combines with 0.123 mole of the element lead to form a compound. What is the empirical formula for the compound?
The empirical formula of the compound with 0.123 moles of bromine and 0.123 moles of lead would be PbBr.
Empirical formula determinationThe empirical formula of a compound is the chemical formula of the compound where the component atoms are in their simplest, whole-number ratios.
In this case, the compound contains bromine and lead:
Br = 0.123 mole
Pb = 0.123 mole
Dividing through by the smallest mole
Br = 0.123/0.123 = 1
Pb = 0.123/0.123 = 1
Thus, bromine and lead are present in a 1:1 ratio in the chemical formula.
In other words, the empirical formula of the compound containing 0.123 moles of bromine and 0.123 moles of lead is PbBr.
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Why do halogens get less reactive?
The halogens gets less reactive as we move down the group because the atomic mass will increases and the number of the electrons are increases.
The halogens get less reactive as we move top to bottom in the group in the periodic table as the atomic mass of the group 17 elements that is halogens will increases and as we move from from top to bottom in the periodic table the electrons are added and the number of electrons are increases.
This is reason , that the reactivity of the group 17 elements that is halogens will decreases as we move from top to bottom.
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What is the evidence for Darwin's theory of evolution?
The evidence for Darwin's theory of evolution is the consistency of the sequence of fossils from early to recent.
Changing populations and species of organisms are at the heart of biological evolution. The British naturalist Charles Darwin is most likely the first individual that comes to mind today when we discuss evolution. The biological evolution via natural selection theory was put out by British biologist Charles Darwin. Darwin believed that species change over time, give rise to new species, and descended from a single ancestor through the process of evolution. Charles Darwin's theory of evolution is known as natural selection. Animals with heritable qualities that aid in survival and reproduction will often generate more offspring than their contemporaries due to the limited resources in nature, increasing the frequency of such traits through subsequent generations.Populations change throughout time through natural selection, becoming increasingly adapted to their surroundings. Natural selection is reliant on the environment and necessitates the presence of heritable variation within a population.
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What happens to the reactivity of metals as you go from left to right a decreases C Doubles B increases D stays the same?
The reactivity of the metals as we go across in the period or from the left to the right horizontally in the periodic table it will decreases.
The reactivity of the metals as we move across the period from left to right in the periodic table it will decreases. the reactivity of the metals as we move in the group from top to the bottom in the periodic table it will increases due the increase in the size of the elements from top to bottom.
Thus, the reactivity of the metals decreases as we move across period from left to the right in the periodic table.
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Draw the structure of the major organic product(s) of the following reaction.
excess Br2
excess OH
The major organic product of this reaction is 2-bromobutane, a saturated hydrocarbon with a bromine atom attached to the second carbon atom.
The major organic product is 2-bromobutane.
Structure:
CH3 CH2 CH2 CH2 Br
| | |
CH3 CH2 Br
1) The reaction begins with bromine reacting with the 2-methylpropane molecule to form the intermediate 2-bromo-2-methylpropane.
2) The intermediate then reacts with hydroxide ions to form the final product, 2-bromobutane.
3) The final product is a saturated hydrocarbon with a bromine atom attached to the second carbon atom.
The major organic product of this reaction is 2-bromobutane, a saturated hydrocarbon with a bromine atom attached to the second carbon atom.
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4 P (s) + 5 O2 (g) -> P4O10 (s)
If 0.554 mol of phosphorus burns, what mass of oxygen is used?
MassMass of oxygen used on combustion of 0.554 mol of phosphorus is 957.12 g.
What is combustion?Combustion is the name given to the chemical reaction in which a material combines with oxygen to produce heat. A substance is said to be combustible if it can burn. Another name for it is fuel. Fuel can be either solid, liquid, or gaseous.
Since, 4 moles of phosphorus burns in the presence of 5 moles of oxygen
Therefore, 0.554 moles of phosphorus will burn in presence of 54×0.554=29.91 moles of oxygen.
Molar mass of oxygen is 32 g/mol.
Hence, mass of oxygen used can be calculated by:
Mass of oxygen used under given reaction conditions =32×29.91⇒957.12 g.
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Mass of oxygen used on combustion of 0.554 mol of phosphorus is 957.12 g. Oxygen has an atomic mass of 15.9994. ss.
What is combustion?Combustion is the name given to the chemical reaction in which a material combines with oxygen to produce heat. Another name for it is fuel. Fuel can be either solid, liquid, or gaseous.
What is combustion of phosphorus?4 moles of phosphorus burns in the presence of 5 moles of oxygen 0.554 moles of phosphorus will burn in presence of 54×0.554=29.91 moles of oxygen. Molar mass of oxygen is 32 g/mol. Mass of oxygen used under given reaction conditions 32×29.9 = 957.12 g.
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What are the products of the following reaction?
OCH2CH2OH excess HBr--> heat
O Br - OCH2CH2Br
O Br + BrCH2CH2OH
O OH + BrCH2CH2Br
O Br + BrCH2CH2Br
The products of the reaction of OCH2CH2OH with excess HBr under heat are: OCH2CH2Br (2-bromoethanol) and BrCH2CH2OH (1-bromo-1-propanol)
The mechanism for the reaction of OCH2CH2OH with excess HBr under heat is a multi-step process that involves the formation of a carbocation intermediate. Step 1: Protonation of the oxygen atom in OCH2CH2OH by HBr to form a good leaving group (OH) and a carbocation intermediate.
Step 2: Bromine atom from HBr attacks the positively charged carbon of the carbocation intermediate to form a covalent bond, resulting in the formation of intermediate compound.Step 3: Deprotonation of the intermediate compound by the remaining hydroxyl group to give OCH2CH2Br (2-bromoethanol) and HBr
Step 4: the HBr molecule from the step 3 could protonate another molecule of OCH2CH2OH and repeat the step 1 to 3 to form BrCH2CH2Br (1-bromo-1-propanol) as second product.
Overall, the reaction is an electrophilic substitution reaction, with HBr as the electrophile and the oxygen atom of the alcohol as the nucleophile.
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