For the number less than 0.1 such as 0.006, the zeroes to the right of the decimal point but before the first non zero digit show the decimal place of the first significant digit.
The number that is given as digits is established using significant figures.Any two non-zero digits that are separated by a zero are significant figure.Every zero that is both to the right and left of a non-zero digit and the decimal point is not significant figure. The quantity of significant figures frequently reveals the degree of measurement accuracy. From the first non-zero digits in the figure, we may determine the number of significant figures.There is only one significant figure in the provided number 0.06. The decimal place of the first digit is indicated by the zeros that appear to the right of the decimal point but before the first non-zero digit.
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Fatty acids that have been chemically altered so that ____________ atoms are on opposite sides of a double bond are called ____________ fatty acids.
Fatty acids that have been chemically altered so that hydrogen atoms are on opposite sides of a double bond are called trans fatty acids.
What are fatty acids?
Fatty acids are the building blocks of fat found in both our food and our body. During digestion, the body transforms lipids into fatty acids so they may be absorbed into the bloodstream. Three fatty acid molecules are joined together to form a molecule called a triglyceride.
Saturated, monounsaturated, and polyunsaturated fatty acids are all present in dietary fats. Even while meals include all three forms of fatty acids, they are frequently grouped according to the prevalent type.
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Suggest a reasonable synthetic strategy for the synthesis of 4-methyl-1,4-pentanediol from methyl-4-hydroxybutanoate hoch2ch2ch2cooch3. please show all arrow pushing for the proposed reaction as well.
A reasonable synthetic strategy for the synthesis of 4-methyl-1,4-pentanediol from methyl-4-hydroxybutanoate hoch2ch2ch2cooch3 and the reaction is Grignard reagent
Here in the Grignard reagent reaction chemical compound with the generic formula R-Mg-X where X is halogen and R is organic group and grignard reaction is the organometallic chemical reaction in which alkyl, allyl, or magnesium halide in the synthesis of that compound 4-methyl-1,4-pentanediol from methyl-4-hydroxybutanoate hoch2ch2ch2cooch3
Synthetic strategy for the synthesis of 4-methyl-1,4-pentanediol from methyl-4-hydroxybutanoate reaction are followed:
What would this frequency become if the person's breathing passage were filled with helium instead of air? assume the same temperature dependence for helium as for air.
1.07×10³Hz frequency become if the person's breathing passage were filled with helium instead of air
Here, air temp is taken as 37.0°C if the person's breathing passage were filled with helium instead of air then we find out velocity of sound in the helium. here velocity of sound in the helium for 0°C is 965m/s
formula for velocity of sound in the helium :
Vw he=Vw at 0°C×√T/273
Whereas Vw he=965×√273+37/273
Vw he=1028m/s
Here we find frequency so fundamental freq=fundamental harmonic no 1(velocity/4(length of tube)
=1(1028/4×0.24)
f=1.07×10³Hz
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A buffer solution is composed of 9.00 mol of acid and 4.75 mol of the conjugate base. if the pa of the acid is 2.40 , what is the ph of the buffer?
The pH of buffer solution is 2.1225
We know that
pH = [tex]pK_a[/tex] + [tex]log_1_0 \frac{[A]^{-} }{[HA]}[/tex]
In this question
[tex]pK_a[/tex] = 2.40
[tex][A]^{-}[/tex] = 4.75 mol
[HA] = 9 mol
Therefore putting values in formula
pH = 2.40 + [tex]log_1_0\frac{4.75}{9}[/tex]
pH = 2.40 + [tex]log_1_0[/tex] 0.52
pH = 2.40 - 0.283
pH = 2.1225
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3-hydroxybutanal can exist in equilibrium as a cyclic hemiacetal.true /false
It is false that 3-hydroxybutanal can exist in equilibrium as a cyclic hemiacetal.
Hemiacetal is produced when one molecule of aldehyde and one molecule of alcohol react.
3-hydroxybutanal (see the structure in the picture below) has both carbonyl and hydroxyl group, so it can, theoretically, undergo an intramolecular reaction to form a cyclic hemiacetal in aquatic solution.
Stability of cyclic hemiacetals depends on the size of the ring. Five or six membered rings are generally favored.
If 3-hydroxybutanal form a cyclic hemiacetal, it will have four membered ring, so it will be very unstable. It cannot exist in aquatic solution, while 4-hydroxybutanal can (see the picture below).
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This country has the most tornadoes in the world every year.
Canada
O United States
O Mexico
O England
Answer:
it's the United states
Explanation:
because It has alot of tornadoes
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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Energy-requiring reactions can occur in biological systems because they can be coupled with reactions that are?
Energy-requiring reactions can occur in biological systems because they can be coupled with reactions that are exergonic reaction.
In chemical thermodynamics, an exergonic reaction is a chemical reaction where the conversion in the free energy is negative (there is a net allow to leave of free energy). This shows a unbidden reaction if the structure is closed and starting and final temperatures are the similar.
Formula of exergonic reaction :
∆G = Gproducts - Greactants
where
∆G = change in free energy
G-products = free energy of products
G-reactants = free energy of reactants
Now, it can understood that "Energy - requiring reactions can occur in biological systems because they can be coupled with reactions that are exergonic reactions."
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What chemical reactions occur in a Nelson's cell?
Explanation:
The graphite anodes are suspended into the brine. During electrolysis, Cl ions are oxidized at the anode and chlorine gas goes out of the cell, while sodium ions are reduced at the mercury cathode forming sodium amalgam. ... Hydrogen gas is obtained as a by–product at the cathode.
What states of matter do halogens exist in at room temperature?
At room temperature, the halogens show all the states of matter.
Halogens are the elements of the periodic table that belong to group number 17 and are non-metals. Fluorine and chlorine are gaseous at room temperature, bromine exists as liquid, whereas iodine and astatine are solid in nature. The halogens are highly electronegative and reactive in nature.
States of matter are the physical form in which a substance can exist. There are three states of matter: solid, liquid and gas. Fluorine and chlorine have weak forces of attraction between their molecules at room temperature, hence gaseous. Bromine has little stronger intermolecular force that prevents its evaporation and hence a liquid. The molecular weight of higher halogens is large with strong forces molecular forces and hence are solids.
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Which reaction best illustrates the behavior of the weak base h2po4- in aqueous solution?
The reaction best illustrates the behavior of the weak base h₂po₄- in an solution is:H₂PO₄ (aq) + H₂O (l) ↔ H₃PO₄ (aq) + OH- (aq)
What is a weak base?
A weak base is a base that, upon dissolution in water, doesn't dissociate completely, therefore the resulting aqueous solution contains only a small proportion of hydroxide ions and the concerned basic radical and a large proportion of undissociated molecules of the base.
Contents 1 pH, Kb, and Kw 2 Percentage protonated 3 A typical pH problem.
Examples of Weak Bases.
Ammonia (NH₃) Ammonia could also be a chemical compound with the formula NH ₃. it is a weak base which exists as a colour less gas under standard conditions for ...
2 Trimethylamine (N (CH₃) ₃)₃ Pyridine
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According to bohr's model, when does an electron emit electromagnetic radiation?
According to Bohr's model, electron emit electromagnetic radiation when an electron moves from the higher energy orbit to the lower energy orbit of an atom.
Niels Bohr (1885–1962) proposed a model for the hydrogen atom that explained its atomic emission spectrum.
According to the Bohr model of the atom:
1. Energy levels of electrons are discrete (certain discrete values of energy), that is why hydrogen shows discrete, bright, colored lines.
2. Electrons orbit the nucleus in orbits that have a set size and energy.
3. Electrons can jump from one energy level to another, absorbing or emitting electromagnetic radiation with a frequency ν (energy difference of the levels).
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There is more traffic between 8 and 9 in the morning because most people start work at 9. this would be a(n) ________.
There is more traffic between 8 and 9 in the morning because most people start work at 9. this would be a(n) hypothesis.
What does the term "hypothesis" mean?A hypothesis is a tested assertion about the relationship between two or more variables or a proposed justification for an observed phenomenon in a scientific context. It helps make a connection to the guiding idea and specific study topic.
It supports data processing and evaluates the study's validity and reliability. It provides a base or further proof to back up the study's validity.
A hypothesis can be categorised as being straightforward, complex, or direction-based.
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0.10 mol of naoh is added to 0.30 mol of weak acid hx in a total volume of 1.00 l. the ph of the resultant solution is 8.65. what is ka for hx?
Ka for HX is 1.12×10⁻⁹.
Balanced chemical equation for the reaction of sodium hydroxide (NaOH) with weak acid (HX):
NaOH + HX ⇄ NaX + H2O
n(NaOH) = 0.10 mol; amount of sodium hydroxide
V = 1.00 L; volume of the solution
c(HX) = (0.3 mol - 0.1 mol) / 1.00 L
c(HX) = 0.2 M; concentration of a weak acid
c(NaX) = 0.1 M; concentration of a salt
pH = 8.65
Henderson–Hasselbalch equation: pH = pKa + log(cs/ck).
8.65 = pKa + log(0.1 M / 0.2 M)
8.65 = pKa - 0.30
pKa = 8.95
Ka = 10∧-8.95
Ka = 1.12×10⁻⁹; the acid dissociation constant
Buffer is a solution that can resist pH change upon the addition of an acidic or basic components and it is able to neutralize small amounts of added acid or base, pH of the solution is relatively stable.
This buffer is example of weak acid (HX) and its conjugate base (X⁻).
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if an atom of carbon gains or loses a proton, what is it called?
Answer:
Carbon can not gain or lose protons because it has 4 electrons.
Explanation:
An instrument can determine the half-life of an element with a 0.8% error. Radon-220 has a half-life of 52 s. What is the absolute error that could be expected measuring the half-life of radon-220?
The absolute error that could be expected when measuring the half-life of radon-220 is 0.416 s
Data obtained from the questionThe following data were obtained from the question:
Percentage error = 0.8%Actual measurement = 52 sAbsolute error =?How to determine the absolute error in measuring the half-lifeWe can obtaine the absolute error as illustrated below:
Percentage error = (Absolute error / Actaul measurement) × 100
0.8% = Absolute error / 52
0.008 = Absolute error / 52
Cross multiply
Absolute error = 0.008 ×52
Absolute error = 0.416 s
Thus, the absolute error in measuring the half-life is 0.416 s
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If each oxygen atom represents 0.050 mol, how many molecules of dichlorine monoxide were present before the decomposition?
0.6 moles molecules of dichlorine monoxide were present before the decomposition.
Balanced chemical equation for reaction of gaseous dichlorine monoxide decomposes to chlorine and oxygen gases:
2Cl₂O → 2Cl₂ + O₂
n(O) = 12 × 0.050 mol
n(O) = 0.6 mol; number of oxygen atoms
n(O) : n(O₂); ratio of oxygen atoms to oxygen molecules (see the picture below)
n(O₂) = 0.6 ÷ 2
n(O₂) = 0.3 mol; amount of oxygen molecules
n(O₂) : n(Cl₂O) = 1 : 2; from balanced equation
n(Cl₂O) = 2 × 0.3 mol
n(Cl₂O) = 0.6 mol; amount of dichlorine monoxide
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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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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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Which activity is the best demonstration of J.J. Thomson's use of creativity in his work?
Answer:
Thomson used creativity to interpret the results of the cathode ray tube experiment. Explain how the atomic theory was modified from Dalton's theory to Rutherford's.
Suppose a graduated cylinder were not correctly calibrated. how would this affect the results of a measurement? how would it affect the results of a calculation using this measurement?
The volume measurements won't be accurate and will be either less than or more than the anticipated figure if the graduated cylinder is accurately calibrated (depending on if the error in calibration is higher or lower). Depending on the calibration error, the calculated value may be higher or lower than the real value.
What is calibration?
Setting up an instrument so that it can generate findings for samples that fall within a tolerable range is part of the calibration process. A key component of instrumentation design is eliminating or reducing conditions that lead to faulty measurements.
Calibration attempts to reduce any measurement uncertainty by confirming the precision of test apparatus. In measuring procedures, calibration quantifies and reduces mistakes or uncertainties to a manageable level.
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What two effects a soluble impurity usually has on the melting point of a compound.
A soluble impurity usually has two effects on the melting point of a compound: an increase in melting point range and a decrease in melting point.
In chemistry, there are two types of impurities: soluble and insoluble.
Soluble impurities are those that dissolve in water quickly and also have a significant impact on the chemical properties of a compound such as a significant increase or decrease in the melting point and boiling point.
For example, salt, milk, and sugar compounds are soluble impurities.
Similarly, insoluble impurities remain undissolved when mixed in water and are also known as suspended impurities.
Examples of insoluble impurities are sand, oil, chalk, rocks, pebbles, etc.
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During the breakdown of fatty acids, not all acetyl coa enters the citric acid cycle, and your body converts some acetyl coa to?
During the breakdown of fatty acids, not all acetyl CoA enters the citric acid cycle, and your body converts some acetyl CoA to ketone bodies.
Acids are molecules or ions that can donate protons, known as Bronsted-Lowry acids, or form covalent bonds with electron pairs, known as Lewis acids. The first category of acids is proton donors or Brønsted-Lowry acids.
Blood is normally slightly alkaline, with a normal pH range of about 7.35 to 7.45. Normally, the body keeps blood pH near 7.40. Doctors measure a person's acid-base balance by measuring the pH of the blood and the levels of carbon dioxide (acid) and bicarbonate (base). No oil is either an acid or a base. Neutral. Oil is a neutral, nonpolar chemical. That is, it is a viscous liquid at room temperature. It is immiscible with water, but soluble in alcohol and ether.
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Name the phase change that occurs when a diamond film forms on a surface from gaseous carbon atoms in a vacuum?
Deposition, when a diamond film forms on a surface from gaseous carbon atoms in a vacuum, a gas changes directly into a solid.
What is deposition?Depositions typically take place in attorneys' offices rather than in courtrooms. A court reporter will record the entire deposition word-for-word while the lawyers interrogate the witness, or deponent, about details of the lawsuit and other events.
The reporter is present throughout the session and will create a transcript at a later time. A deposition could also be videotaped. This is typically done when the deponent is so very ill and may not be well enough for trial, or whether the deponent will be out of town or unavailable during trial.
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23 What kind of change-chemical or physical-accompa-
nies each of the following?
(a) The conversion of two elements to a compound
(b) The conversion of two compounds into a solution
(c) The combination of an element and a compound into
another compound
(d) The conversion of a compound to an element and
another compound
(e) The separation of a mixture into its components
A chemical change is one that leads to the formation of a new substance. It involves the rearrangement of the atoms in a substance to produce a new substance(s).
A physical change does not involve the rearrangement of atoms. It does not also lead to the formation of new substance. The changes are as follows;
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Calculate the energy (a) in ev and (b) in joules of the third energy level (n= 3) ofa hydrogen atom.
The energy (a) in EV and (b) in joules of the third energy level (n= 3) of the hydrogen atom.
-1.51 eV
-2.42 x 10^-19 J
In physics, energy is a quantitative property that is transferred to a body or physical system and can be perceived in the performance of work or in the form of heat and light. Energy is Conserved - The law of conservation of energy states that energy can be transformed into form, but cannot be created or destroyed.
The energy price cap, introduced in 2019 by market regulator Ofgem, sets the maximum amount (known as the “unit price”) that utilities can charge per kWh of gas and electricity. There is no right or wrong answer to choosing between a fixed power plan and a variable power plan. Which energy rate is best for your home depends on your assessment of future energy prices and your willingness to take risks. Compare energy suppliers to find the perfect match.
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Calcium carbide, CaC2, is manufactured by reducing lime with carbon at high temperature. (The carbide is used in turn to make acetylene, an industrially important organic chemical.) CaO(s)+3C(s)→CaC2(s)+CO(g) ΔH=464.8kJ Calculate the quantity of energy, in MJ, transferred when a metric ton(1000 kg) of CaC2(s) is manufactured. Ca = 40 g/mol C = 12 g/mol O = 16 g/mol
The energy of the carbide released is 7262.5MJ.
What is the energy?We know that the reaction between calcium oxide and carbon occurs in accordance with the reaction; [tex]CaO(s)+3C(s)----- > CaC_{2} (s)+CO(g)[/tex]. The reaction is seen to produce 464.8kJ of energy per mole of carbide produced.
Number of moles of [tex]CaC_{2}[/tex] produced = 1000 * 10^3 g/64 g/mol
= 15625 moles of calcium carbide
If 1 mole of [tex]CaC_{2}[/tex] transfers 464.8 * 10^3 J
15625 moles of calcium carbide transfers 15625 moles * 464.8 * 10^3 J/ 1 mol
= 7262.5MJ
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Calculate the mass of dinitrogen tetroxide. (N₂O4) that contains a billion (1.00 × 10º) nitrogen atoms.
Answer:
7.6410^-14 grams N2O4
Explanation:
I will assume that "contains a billion (1.00 × 10º)" is meant to read "(contains a billion (1.00 × 10^9)."
One mole of anything contain 6.02x10^23 particles of that thing (atoms, molecules, paper clips, suns, etc.). If there are 1.00x10^9 particles of N2O4, we have:
(1.00x10^9 particles N)/(6.02x10^23 particles/mole) = 1.66x10^-15 mole of N atoms
Each mole of N2O4 contains 2 moles of N atoms:
(1 mole N2O4)/(2 moles N atoms)
(1.66x10^-15 mole of N atoms)*(1 mole N2O4)/(2 moles N atoms) =
8.31x10^-16 moles N2O4
The molar mass of N2O4 is 92.01 g/mole.
(8.31x10^-16 moles N2O4)*(92.01 g/mole) = 7.6410^-14 grams N2O4
When a cell is placed in a solution with a very low solute concentration, water diffuses into the cell. such a solution is called a(n) _________ solution.
When a cell is placed in a solution with a very low solute concentration, water diffuses into the cell. such a solution is called a hypotonic solution. Subtract the solute's mass from the total volume of the solution. Divide the figures you found for mass and volume to find the concentration of your solution.
The overall solute concentration of a solution is described by its osmolarity. A solution with a low osmolarity has more water molecules than solute particles; a solution with a high osmolarity contains fewer water molecules than solute particles. Solute concentration is defined as the amount of solutes and particles dissolved in a solution.
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Propane, c3h8, is a common fuel used for cooking and home heating. what mass of o2 is consumed in the combustion of 1.00 g of propane?
3.63g of O2 is consumed in the combustion of 1.00 g of propane.
Propane, c3h8, is a common fuel used for cooking and home heating.
C3H8 + 502---> 3CO2 + 4H20.
The combustion equation must first be balanced as illustrated above. The law of constant proportions can then be used to deduce that for every 1 mol of C3H8, there will be 5 mol of O2.
Using significant figures,
1 mol C3H8 -------> 44 g
1 mol O2 ------> 32g x 5 = 160
= 160/ 44g
160g/44g= 40/11 = 3.63g.
= 3.63g of O2 is consumed in the combustion of 1.00 g of propane.
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