One molecule of nabh4 will reduce only two molecules of m-acetylbenzaldehyde to form the corresponding product because there are only two functional groups that can react with NaBH4, namely the ketone and the aldehyde, but NaBH4 had four H present to protonate the molecule.
What is protonation?
An atom, molecule, or ion can be protonated by adding a proton to it. The difference between protonation and hydrogenation is that during protonation, the protonated species' charge changes, whereas it remains unchanged during hydrogenation. Numerous catalytic processes result in protonation.
A conjugate acid is created when a proton (or hydron, or hydrogen cation), (H+), is added to an atom, molecule, or ion. Deprotonation is the analogous process that occurs when a proton is taken out of a Bronsted-Lowry acid.
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Which one of the following pairs of elements would be most likely to share similar properties?
a) n and f
b) b and si
c) cl and br
d) br and kr
e) li and be
Elements that would share similar properties are c) Cl and Br.
Elements chlorine (Cl) and bromine (Br) are both halogen elements.
In VIIA or group 17 (halogen elements) there are six elements: fluorine (F), chlorine (Cl), bromine (Br), iodine (I), astatine (At) and tennessine (Ts).
They have high electronegativity because they have seven valence electrons in their outermost energy level, so they can gain an electron to have the octet rule.
Electronegativity is a chemical property that describes the tendency of an atom to attract a shared pair of electrons towards itself.
Chemical properties of these elements are similar, because they have the same number of valence electrons.
a) Nitrogen(N) and fluorine (F) are not in the same group of Periodic table of elements, so they have different properties.
b) Boron (N) and Si (silicon) are not in the same group of Periodic table.
d) Bromine and Kr (krypton) are different, because krypton is a noble gas.
e) Lithium (Li) and beryllium (Be) are not in the same group of Periodic table.
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_____________ pollutants are produced in the air as a part of photochemical smog resulting from a chemical reaction in the presence of sunlight.
Secondary pollutants are produced in the air as a part of photochemical smog resulting from a chemical reaction in the presence of sunlight.
What are secondary pollutants?The secondary pollutants are the type of pollutants that are formed as a result of combination of two or more primary pollutants in the presence of sunlight.
Examples of secondary pollutants include the following:
The ozone gas: This is formed as a result of the combination of hydrocarbons (HC) and nitrogen oxides (NOx) in the presence of sunlight.The acid rain: This is formed as a result of when sulfur dioxide or nitrogen oxides react with water in the presence of sunlight.Photochemical smog: This is the combination of nitrogen oxides and volatile organic compounds (VOCs) under sunlight to form a brown haze above cities.Therefore, Secondary pollutants are produced in the air as a part of photochemical smog resulting from a chemical reaction in the presence of sunlight.
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How many electron bonds are shared between tewo carbon atoms when they are joined by a double bond?
2 electron bonds are shared between two carbon atoms when they are joined by a double bond.
An atom is a particle of matter that uniquely defines a chemical element. Atoms consist of a central nucleus surrounded by one or more negatively charged electrons. The nucleus is positively charged and contains one or more relatively heavy particles known as protons and neutrons.
Atoms are made up of two types of elementary particles: electrons and quarks. Electrons occupy the space surrounding the nucleus. Each electron has a charge of -1. Quarks form protons and neutrons, which form the nucleus. About 99% of the human body is made up of atoms of hydrogen, carbon, nitrogen, and oxygen. It also contains much smaller amounts of other elements necessary for life. November 6, 2015
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what is the smallest unit of length
Answer:
Plank length
Explanation:
The smallest possible size for anything in the universe is the Planck Length, which is 1.6 x10-35 m across.
8. in the preparation of methyl benzoate what is the purpose of washing the organic layer with saturated sodium chloride?
The purpose of washing the organic layer with saturated sodium chloride is to remove any of the unreacted benzoic acid
What is sodium chloride?
One of the most prevalent minerals on Earth is sodium chloride (NaCl), also known as salt. It is a crucial nutrient for many animals and plants. Seawater and subterranean rock formations are also naturally sources of sodium chloride.
In order to keep patients from becoming dehydrated, sodium chloride, a vital nutrient, is utilized in healthcare. It is employed as a spice to boost flavor and as a food preservative. Additionally, sodium chloride is employed in manufacturing to create polymers and other goods. Additionally, it is employed to de-ice sidewalks and highways.
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The ancestors of modern _________ performed the oxygenic photosynthesis responsible for converting our anoxic planet to an oxygenated one.
The ancestors of modern cyanobacteria performed the oxygenic photosynthesis responsible for converting our anoxic planet to an oxygenated one.
Photosynthesis sustains life on Earth today by releasing oxygen into the atmosphere and providing energy for the food chain. The rise of oxygen-producing photosynthesis enabled the evolution of complex life forms such as animals and land plants about 2.4 billion years ago. An example of photosynthesis is how plants grow by converting sugars and energy from water, air, and sunlight into energy. (biology) The process by which plants and other photoautotrophic plants produce carbohydrates and oxygen from carbon dioxide, water, and light energy.
Photosynthesis is important for plants to produce the glucose needed to manufacture energy and cellular structures. Photosynthesis also produces the oxygen that both plants and animals need for cellular respiration to make ATP, a complex organic chemical that provides energy.
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Identify the homogeneous mixture among the following:
fog
air
milk and cereal mixture
ice cubes in soda
How many o atoms are in 259 g of c12h21o9? molar mass of c12h21o9 = 309.29 g/mol
The number of atoms in 259 g of C₁₂H₂₁O₉ is 45 x 10²³ oxygen.
What is molar mass?The molar mass of many compounds can be calculated by dividing the mass of the compound by the number of moles of the compound.
Given the molar mass is 309.29 g/mol
Given weight= 259g
number of moles = mass / molar mass
259g / 309.29g/mol =0.837mol
1 mol contains 6.022 x 10²³ molecules
0.837 mol contain 6.022 x 1023 x 0.837 = 5.0 x 10²³ molecules
1 molecule of C₁₂H₂₁O₉ contains 9 oxygen atoms
5.0 x 10²³ molecules of C₁₂H₂₁O₉ contain 9x 5 x 10²³ oxygen atoms.
=45 x 10²³ oxygen atoms
Thus, the number of atoms in 259 g of C₁₂H₂₁O₉ is 45 x 10²³ oxygen atoms
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Answer:
Explanation: your the best
A 23.98 gram sample of chromium is heated in the presence of excess iodine. a metal iodide is formed with a mass of 199.6 g. determine the empirical formula of the metal iodide.
The empirical formula of the metal iodide is Cr2I.
Mass of Chromium = 23.98
Molar Mass of Chromium = 51.9961
= 0.461 mol
Molar Mass of iodide = 126.9
= 199.6-23.88/126 = 1.394
The ratio between
Chromium and iodinei is1:2.So, the empirical formula is therefore Cr2I
Empirical formula of a chemical compound is the simplest whole number ratio of atoms present in a compound.[1] A simple example of this concept is that the empirical formula of sulfur monoxide, or SO, would simply be SO, as is the empirical formula of disulfur dioxide, S2O2. Thus, sulfur monoxide and disulfur dioxide, both compounds of sulfur and oxygen, have the same empirical formula. However, their molecular formulas, which express the number of atoms in each molecule of a chemical compound, are not the same.
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Which of these is a chemical change?
OA lake freezes solid.
O A copper bar is rolled into a flat sheet.
O Gravel, sand, and water are mixed.
O Vinegar bubbles when baking soda is added.
Answer:
Vinegar and baking soda
Explanation:
The others are physical changes, not chemical changes. This is because they do not change chemical properties or undergo a reaction.
However, when vinegar and baking soda are added together, it is a chemical change, because there is not only a reaction, but a change in its properties. Hopefully this helps!
Calculate the mass defect of the oxygen nucleus 16 8o 816o . the mass of neutral 16 8o 816o is equal to 15.994914 atomic mass units
The mass defect of the oxygen nucleus is 16 8o 816o. the mass of neutral 16 8o 816o is equal to 15.994914 atomic mass units
8(1.008665)+8(1.007825)
=16.13192
16.13192-15.994914
=.13701 amu
The atomic nucleus is a small, dense region made up of protons and neutrons at the center of an atom, discovered by Ernest Rutherford in 1911, based on Geiger-Marsden's gold leaf experiment in 1909. After the discovery of the neutron in 1932, models of the nucleus composed of protons and neutrons were rapidly developed by Dmitri Ivanenko[1] and Werner Heisenberg. I was.
The cell nucleus carries genes, structures that control and regulate cell activity (such as growth and metabolism) and contain genetic information. Nucleoli are small bodies commonly found within the nucleus. The nucleoplasm is the gel-like matrix in which the core components are suspended.
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How many moles of acetic acid are in 1.52 ml if the concentration of the solution is 1.23 m.?
Acetic acid are in 1.52 ml if the concentration of the solution is 1.23 m 0.031 mole are present.
Here mass of acetic acid is 60g/mol and here given mole is 1.52 ml then
1.52/60= 0.025 and also here concentration are given then concentration=n/V so, n=C×V= 1.23 × 0.025=0.03mole
So in 1.52 ml 0.03mole are seen
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A(n) ___________ covalent bond is formed by an unequal sharing of one or more electron pairs.
A Polar covalent bond is formed by an unequal sharing of one or more electron pairs.
The bond formed by sharing of an electron pair between two atoms is known as covalent bond.
In a polar covalent bond the atoms have an unequal attraction for electrons and so the sharing is unequal. Bond between Oxygen and Hydrogen in water molecule is one of the example of polar covalent bond.
In Non-Polar Covalent bond the atoms have an equal attraction for electrons and so the sharing is equal. Bond between two Hydrogen atoms in [tex]H_{2}[/tex] molecule is one of the example of non-polar covalent bond.
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Why would returning chemicals to a reagent bottle introduce contaminants?
Because the excess chemical compound can be contaminated with other chemical compound and some reaction can be happen thats why returning chemicals to a reagent bottle introduce contaminants.
There is a chance for the chemicals which is taken out from the reagent bottle to be contaminated with other substances. the chemical property of some of these chemicals may change on contact with air. all these factors may affect the quality of further reactions that were supposed to be carried out by these unused reagents
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How many moles of oxygen atoms are in 4.14 moles of magnesium phosphate: mg3(po4)2 (mw. 262.87 g/mol)?
33.12 moles of oxygen atoms are present in 4.14 moles of magnesium phosphate, Mg₃(PO₄)₂.
Molecular weight of magnesium phosphate = 262.87 g/mol
Number of moles of magnesium phosphate = 4.14 moles
Since,
1 mole of magnesium phosphate contains 8 moles of oxygen atom
therefore,
4.14 moles of magnesium phosphate will contain 4.14 × 8 oxygen atoms.
1
Hence, 33.12 oxygen atoms are present.
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For a polymerization reaction with a termination step, what is the shortest material there in highest concentration?
For a polymerization reaction with a termination step, what is the shortest material there in highest concentration is monomer.
A polymer is a large single chain-like molecule in which the repeating units derived from small molecules called monomers are bound together. process by which monomers are transformed into a polymer is called polymerization. it helps to produce new chemicals like glycogen, cellulose, fatty acids etc. the termination step involves the reaction of a polymer chain radical with another free radical. These three steps constitute the normal step-growth polymerization process. the polymer concentration is associated with solution viscosity, which increases with the increase of the polymer concentration and then leads to a larger fiber diameter. if concentration is too low, continuous polymer fibers cannot be achieved.
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According to mo theory, when two atomic orbitals overlap, they combine to form an antibonding mo that is ____ energy and a bonding orbital that is _____ energy.
According to MO theory, when two atomic orbitals overlap, they combine to form an antibonding molecular orbitals that is lower energy and a bonding orbital that is higher energy. The electrons in a molecule are viewed as moving under the influence of the atomic nuclei throughout the entire molecule in molecular orbital theory rather than being allocated to specific chemical bonds between atoms.
The molecular orbitals that encircle and contain valence electrons between atoms in molecules are how quantum mechanics characterizes the spatial and energetic characteristics of electrons. By roughly representing the states of bound electrons—the molecular orbitals—as linear combinations of atomic orbitals, the molecular orbital theory revolutionized the study of chemical bonding (LCAO).
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do ions add another atom
yes ions add another atom
ions are electrically charged particles that can be created by either taking electrons away from neutral atoms to form positive ions or adding electrons to neutral atoms to produce negative ions. The quantity of protons remains constant during the formation of an ion.
Ionic bonds are defined as connections between atoms in which electrons are primarily transported from one atom to another. Since there is always some electron sharing between atoms, we say largely because the sharing in ionic bonds is relatively uneven. The bond has a stronger ionic character the more unequally the electrons are shared.
Between a metal and a non-metal, ionic bonding form. Ionic bonds, as opposed to covalent ones, involve the transfer of valence electrons between atoms.
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yes Ions can be combined with other atoms to create new elements or compounds.
Since they contain an equivalent number of protons and electrons, atoms are neutral particles. Ions are electrically charged entities that can be created by either taking electrons away from neutral atoms to form positive ions or adding electrons to neutral atom to form negative ions.An atoms become the ions when the neutral atom gain the electrons to formed anions and loses its electrons to formed cations.The anions can be combined with the cations through the ionic bond or electrostatic bond.The stable atoms is electrical neutral atom or an atom is not stable when it contains any charge over it like negative or positive charge.However not all ions are atoms, an atom can be an ion.
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Which compound in each of the following pairs of ionic substances has the most exothermic lattice energy?
The compound with the most exothermic lattice energy in each of the following pairs of ionic substances is Ca3N2.
What is Lattice energy?When ion pairs with opposing charges in the gas phase combine to create a solid, lattice energy is released.Lattice energy becomes weaker the lower you go in a group.As one descends a group, the atomic radius grows.As the atomic radius rises, the lattice energy falls because the force of attraction is inversely proportional to the square of the distance.As the charge's size rises, lattice energy rises as well.The product of the particle charges determines the force of attraction in a direct proportion.As a result, lattice energy rises as the charges do.Conclusion: The top of the Periodic Table will include the salts with the highest ionization energy and highest charges.To learn more about Lattice energy, refer to the following link:
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Bam added 5.42 g of cscl to 35.31 ml of h2o. calculate the concentration of bam's solution in units of g solute/100 g solvent. mwcscl= 168.36 g/mol mwh2o= 18.015 g/mol density of water= 0.9975 g/ml
Bam's solution, 5.42 g of CsCl mixed with 35.31 ml of H2O, has a concentration of 15.3882 g CsCl/100 g H2O.
Concentration, in chemistry, is defined as the amount of solute in a particular amount of solvent or solution. Some of the most common ways to express concentration includes molarity, mass-to-mass and mass-to-volume.
To solve for the concentration of Bam's solution in g solute/100 g solvent, solve for the mass of the solvent first.
To solve for the mass of the solvent, use the density and volume:
mass solvent = density x volume
mass solvent = 0.9975 g/ml x 35.31 ml
mass solvent = 35.221725 g
Solving for the concentration of Bam's solution in g solute/100 g solvent, where the mass of the solute CsCl is 5.42 g:
concentration = mass solute/ 100 g solvent
concentration = 5.42 g/ (35.221725/100)
concentration = 15.38822985
concentration = 15.3882 g CsCl/100 g H2O
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Thermal Energy - Too Hot to Handle
Conclusion: Describe the results of your experiment making sure to use the following vocabulary words in your description of each beaker water molecules, kinetic energy, temperature.
The average kinetic energy of an object's particles increases with increasing temperature. The object's thermal energy grows as the average kinetic energy of its particles rises. As a result, an object's thermal energy rises as its temperature does.
The average kinetic energy of the particles in a substance is measured by temperature. The overall kinetic energy of the particles in a substance is measured by its thermal energy. The temperature and thermal energy of a substance increase with particle mobility. Temperature and thermal energy are strongly connected. Both reflect the motional kinetic energy of matter particles. Thermal energy is the total kinetic energy of matter particles, whereas temperature is the average kinetic energy of matter particles.
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What type of bond forms when the sulfur atoms in two adjacent protein chains are joined together?what type of bond forms when the sulfur atoms in two adjacent protein chains are joined together?
Disulfide bond forms when the sulfur atoms in two adjacent protein chains are joined together.
What kinds of side bonds are there in proteins?When the sulfur atoms in two adjacent protein chains come together, strong chemical side bonds form. Weak physical side bonds are caused by the attraction of opposite electrical charges. Polypeptide chains that are coiled. Chemical bonds that connect amino acids end to end in long chains.
How do peptides join together to form proteins?These peptide subunits can form complex structures by bonding with other peptides. Chemical bonds of various types hold proteins together and bind them to other molecules. Examine the chemical bonds that are responsible for protein structure. A protein's primary structure is made up of amino acids linked together in a chain.
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a block of wood has a volume of 45 cm ^3 and a mass of 180 grams what is the density of the wood
The density of a block of wood that has a volume of 45 cm³ and a mass of 180 grams is 4g/cm³.
How to calculate density?The density of a substance is the measure of the mass of matter contained in the substance by a unit volume.
The density of a substance can be calculated by dividing the mass of the substance by its volume i.e.
Density = mass (g) ÷ volume (mL)
According to this question, a block of wood that has a volume of 45 cm³ and a mass of 180 grams will possess a density of:
Density = 180g ÷ 45cm³ = 4g/cm³
Therefore, the density of a block of wood that has a volume of 45 cm³ and a mass of 180 grams is 4g/cm³.
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Process in which co2, is released as a by-product of oxidation-reduction reactions.
Kreb's cycle or citric acid cycle is the process in which CO₂ is released as a by-product of oxidation-reduction reactions.
We all know that the by-product of respiration is CO₂. The CO₂ is actually a by-product of an oxidation-reduction reaction that occurs in the mitochondria of all eukaryotic cells called the Kreb's cycle.
The Kreb's cycle is also called the citric acid cycle because the first product is usually citric acid. It is the second stage in cellular respiration, and is also called the aerobic stage, as it requires oxygen to occur. Since it requires oxygen, anaerobic organisms do not engage in the Kreb's cycle.
During glycolysis, one glucose molecule is broken down to give two pyruvate molecules, which concludes the first stage of cellular respiration. The pyruvate molecule is then taken to the matrix of the mitochondria, where the Kreb's cycle occurs and is decarboxylated to give CoA. Certain enzymes then break down the CoA to give two molecules of CO₂ as a by-product and one molecule of H₂O.
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What is the immediate effect of hyperventilation (breathing too fast) on the co2co2 concentration in the blood?
The immediate effect of hyperventilation on the CO₂ concentration in the blood is low levels of carbon dioxide in the blood.
Low levels of carbon dioxise makes a person feel light- headed and increases heartbeat and results in shortness of breath.When hyperventilation occurs, the concentration of carbon dioxide decreases in the blood and the protonization of the blood also decreases. Therefore, the H + ions decrease in concentration, which results in the generation of metabolic alkalosis.Respiratory system collaborates by generating hypoventilation, to regulate the metabolic alkalosis. It is also regulated by various other systems. If you exhale more than you inhale, it results in the reduction in carbon dioxide in the body. Hyperventilation upsets the balance of gases as too much CO₂ is removed.If CO₂ levels in the blood drops, pH of the blood is altered resulting in the condition called alkalosis, which makes a person feel weak or faint.To learn more about hyperventilation,
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How much money will it cost to drive a school bus 94.00 miles if it gets 6.500 miles per gallon and gas costs $2.459/gallon?
Answer:
It will cost $35.5602
Explanation:
$2.459 /6.5 (mpg) = 0.3783 (cents per mile)
$0.3783 (cost per mile) * 94 (total miles) = $35.5602 total
There are 94,608,000 seconds using conversion factor in 3 years.
First, let's calculate the number of seconds in 1 year, and then multiply it by 3 to get the total number of seconds in 3 years.
Conversion factors:
1 year = 365 days
1 day = 24 hours
1 hour = 60 minutes
1 minute = 60 seconds
Step 1: Calculate the number of seconds in 1 year.
[tex]\[\text{1 year} = 365 \text{ days} \times \left(24 \text{ hours/1 day}\right) \times \left(60 \text{ minutes/1 hour}\right) \times \left(60 \text{ seconds/1 minute}\right)[/tex]
Step 2: Calculate the number of seconds in 3 years.
[tex]\[\text{3 years} = 3 \times \left(365 \text{ days} \times \left(24 \text{ hours/1 day}\right) \times \left(60 \text{ minutes/1 hour}\right) \times \left(60 \text{ seconds/1 minute}\right)\right)\][/tex]
Now, let's perform the calculations:
1 year = 365 * 24 * 60 * 60 seconds
= 31,536,000 seconds
3 years = 3 *31,536,000
= 94,608,000 seconds
So, there are 94,608,000 seconds in 3 years.
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What is the atomic number of mercury
Answer:
Mercury is a chemical element with the symbol Hg and atomic number 80. It is also known as quicksilver and was formerly named hydrargyrum
Source: Wikipedia
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Petrification is the combination of 2 types of fossilization, replacement and permineralization, by which element? group of answer choices iron silica sodium carbon
The element involved in the process of petrification, replacement, and permineralization is silica, were petrification is the combination of 2 types of fossilization, replacement, and permineralization
Permineralization is a way of fossilization in which minerals ( like silica have deposited the fill the empty pores of shells or the hard animal parts). Petrification is a process where the organic material is converted to stone by replacing the original material and the pores with minerals, and Replacement occurs when the original bones or shells dissolve away and is replaced by a different mineral, which occurs along with permineralization, the whole process is called petrification.
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Calculate the ph of a solution prepared by dilution 3.0 ml of 2.5 m hcl to a final volume of 100 ml with h2o.
The pH of the solution after dilution is 1.125.
HCl is hydrochloric acid. It is known by the name muriatic acid. It is among the strong acids. It has a pungent smell and is colorless. It has a molar mass of 36.4 g/mol. It's a common reagent used in pharmaceutical industries. It is also used in other industries such as textile, rubber, and metal.
The volume of HCl added to the solution = 3.0 ml
The molar concentration of HCl = 2.5 M
Let the molar concentration of the solution after dilution is x.
The volume of the diluted solution = 100 ml.
The molar concentration of the solution after dilution is,
[tex]M _{1} V _{2} = M_{2} V _{2} [/tex]
[tex]M_{2} = \frac{ M _{1} V _{2}}{V _{2} }[/tex]
[tex]M_{2} = \frac{2.5 \times 3}{100} [/tex]
[tex] = 0.075 \: M[/tex]
Thus, the molar concentration of the solution after dilution is 0.075 M.
The pH of the solution after the dilution is,
[tex][HCl] = [H ^{ + } ] = 0.075 \: M[/tex]
[tex]pH = - log [H ^{ + } ] [/tex]
[tex]pH = - log(0.075)[/tex]
[tex]pH = 1.125[/tex]
Therefore, the pH of the solution after dilution is 1.125.
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name two physical properties that could be used to distinguish between water and ethanol.
Answer:
boiling point and melting point.
