Element, transition metal, or inner transition metal is given below.
What is periodic table?The periodic table is a tabular arrangement of the chemical elements organized on the basis of their atomic numbers, electron configurations, and recurring chemical properties. It is one of the most important tools in chemistry and is used for predicting the properties of different elements and their compounds. The elements are listed in order of increasing atomic number, which is the number of protons an element has in its nucleus.
(a) Uranium: Metal, Inner Transition Metal
(b) Bromine: Nonmetal, Main-group Element
(c) Strontium: Metal, Main-group Element
(d) Neon: Nonmetal, Main-group Element
(e) Gold: Metal, Transition Metal.
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What is the temperature (in K) of 16.45
moles of methane gas in a 70.7 L
container at 3,557 torr?
At 3,557 torr, 16.45 moles of methane gas are at a temperature of T=17.15 K in a 70.7 L container.
According to the ideal gas law: PV=nRT, where R=0.082 and T is temperature in Kelvin (K). P is pressure, V is volume, n is the amount in moles.
(4.68)*(4.95)=(16.45)*(0.0821)*
T=17.15, therefore calculate it.
What's called gas?An object that is in the gaseous, or vaporous, condition of matter, is referred to as a gas. When referring to material with characteristics of a gaseous substance, the word "gas" can also refer to the condition itself. Along with liquid, solid, and plasma, gases are one of the four natural states of matter. The shape or volume of a gas can change.
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Answer:
245
Explanation:
everyone needs to chill don't answer if you can't get it right it wastes you time and others as well not trying be a hater but its true
A certain substance has a fixed composition of S and Cl atoms regardless of its source. Which of the following statements about the substance is true?A.) The substance is a homogenous mixtureB.) The substance contains atoms of silicon and chlorineC.) The substance is a heterogenous mixtureD.) The substance is a compound that contains two elementsE.) The substance must contain equal numbers of S and Cl atoms
The answer was the substance is a compound that contains two elements.
What is meant by elements ?
A fundamental object that is difficult to divide into smaller bits is known as an element.An element is a substance that cannot be broken down by non-nuclear reactions in chemistry and physics.A discrete component of a larger system or collection is referred to as an element in computers and mathematics.The names nihonium, moscovium, tennessine, and oganesson are the official names for elements 113, 115, 117, and 118, respectively.A pure element is one that is made up of atoms of the same kind. Since sodium exclusively contains sodium atoms, it is a pure element. While various atom types make up cement and glass, respectively.To learn more about elements refer to
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in the combustion of octane co2 and water are produced. starting with 22.4 g of cotane and excess o2 will produce how many grams of co2
69 grams of CO2 will produce in the combustion of octane where CO2 and Water is produced.
Combustion is defined as the chemical reaction between substances including oxygen. The reaction is accompanied by the generation of heat and light in the form of flame. The products CO2 and H2O forms when octane is burned. The process of combustion cannot take place in an atmosphere devoid of oxygen. The main ingredient of combustion is oxygen. The balanced chemical equation for combustion of octane is,
2C8H18 + 25O2 ----> 16CO2 + 18H2O
The molar mass of C8H18 = 114 g/mole
The molar mass of CO2 = 44 g/mole
The mass ratio of C8H18/CO2 is 2* 114 / (16 * 44)
22.4 g of octane generates, 69 gram of CO2.
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You mix 260. mL of 1.20 M lead(II) nitrate with 300. mL of 1.90 M potassium iodide. The lead (II) iodide is insoluble. Which of the following is false? a) The final concentration of Pb2+ ions is 0.0482 M. b) You form 131 g of lead(II) iodide. c) The final concentration of K+ is 1.02 M. d>The final concentration of NO, is 1.02 M. e) All are true.
All are true. The resulting solution will have a NO3- ion concentration of 672 mmoles/580 mL, or 1.159 M.
Pb(NO3)2 volume = 260 mL = 0.26 L
Pb(NO3)2 has molarity of 1.2 M.
KI volume = 300 mL = 0.3 L
KI has a molarity of 1.9 M.
Pb(NO3)2 + 2KI reaction rightarrow PbI2 + 2KNO3
First potassium iodide.
Potassium iodide we must determine the moles of reactants present: Pb(NO3)2 moles = Pb molarity (NO3) 1.2 × 0.26 = 0.312 moles = 2 times Volume in L 1.9 x 0.3 = 0.57 moles of KI = Molarity of KI x Volume in L
We know from stoichiometry that For the reaction to proceed, 1 mole of KI requires 1/2 mole of Pb(NO3)
2. As a result, 0.57 mole of KI necessitates (1/2 * 0.57) mole of Pb(NO3)2 for the reaction to continue.
0.285 moles of Pb(NO3)2 required
We have 0.312 moles, which indicates that Pb(NO3)2 is present in excess.
You mix 260. mL of 1.20 M lead(II) nitrate with 300. mL of 1.90 M potassium iodide.The lead (II) iodide is insoluble all are true.
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if the empirical formula of an organic compound is CH2O then the molecular mass of the compound could be what
The empirical formula of an organic compound gives the simplest whole number ratio of the different elements in the compound. In this case, the empirical formula of the compound is CH2O, which means that the compound is made up of one Carbon atom, two Hydrogen atoms, and one Oxygen atom.
The molecular mass of a compound can be determined by adding up the atomic masses of all the atoms in its empirical formula. The atomic mass of Carbon is 12.0107 g/mol, the atomic mass of Hydrogen is 1.008 g/mol, and the atomic mass of Oxygen is 15.9994 g/mol.
So, the molecular mass of the compound with an empirical formula of CH2O is (12.0107 + 2 x 1.008 + 15.9994) g/mol = 30.03 g/mol
Therefore, the molecular mass of the compound is 30.03 g/mol.
Using the following reaction
A + 2B = 3C + D + heat
If D is removed, what happens to A?
Concentration
of A increases
Concentration
of A decreases
A's concentration falls if D is removed. In this scenario, the equilibrium position will change, causing A's concentration to once again drop as a result of its reaction with B to produce more C and D.
What is the Le Chatelier creed?The following is the Le Chatelier principle: A shift in the equilibrium's location cancels out the impact of a change in one of the variables that define an equilibrium in a system.
The KP equation is what?The broad statement: Kp = Kc(RT) (RT) Where n = moles of gaseous products - moles of gaseous reactants, one can derive n. Pure solids and pure liquids are not given concentration words.
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assignment is to list three different areas of science that changed significantly in the Scientific Revolution After you have come up with three areas of the sciences you will write three to four sentences on how these sciences contributed to the Scientific Revolution. Make sure you are going below the surface: who contributed and how they created change, what ideas were challenged, what questions did they want answered?
Three different areas of science changed significantly in the Scientific Revolution, abstract reasoning, quantitative thought, and an understanding of how nature works.
What is a scientific revolution?Focusing on quantitative analysis, understanding how nature functions, seeing nature as a machine, and developing an experimental scientific method were all hallmarks of the Scientific Revolution.
The world's understanding of the principles of motion and gravity improved thanks to the Scientific Revolution, which also laid the groundwork for several other discoveries and inventions.
Therefore, the Scientific Revolution brought about important changes in three different branches of science: abstract reasoning, quantitative thinking, and an understanding of how nature functions.
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Use the following table of bond energies to calculate the molar enthalpy of combustion (in kJ/mol) of acetylene (C₂H₂) gas in oxygen, based on the following chemical equation:
C₂H₂(g) + 2.5O₂(g) → 2CO₂(g) + H₂O(g)
The heat of combustion of the reaction is -859 kJ/mol.
What is the enthalpy of combustion?When we talk about the enthalpy of combustion, we mean the heat that is required in order to burn up the compound in the presence of oxygen. Recall that the heat of reaction is gotten by the use of the formula;
Sum of the bond energies of the reactants - Sum of the bond energies of the products
As such, we have;
[(1 * 835) + (2 * 411)] - [(2 * 799) + (2* 459)]
= (835 + 822) - (1598 + 918)
=1657 - 2516
= -859 kJ/mol
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: identify the structures of each amino acid and classify each amino acid. the structures of each amino acid are shown.
Aliphatic, aromatic, acidic, basic, acid amide, sulfur and cyclic amino acids. Based on characteristic of functional group amino acids are classified as: polar and non-polar amino acids.
What is meant by functional?
Functional refers to an object's operation or usefulness. It also denotes that it relates to how it performs or operates.A mathematical machine known as a function accepts one or more numbers as inputs and outputs another number.One or more functions may be inputs to a functional, which outputs a number. A Functional is a function of Functions, then.All biological activities, including digestion, elimination, respiration, and others, can be performed by a cell. The functional unit of life is referred to be such for this reason. Each and every living thing is made up of cells, which are the smallest unit of life.To learn more about functional refer to
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For the following acid-base reaction, predict the position of the equilibrium and identify the most acidic compound.O favor the right side with compound I being the most acidic compound O favor the right side with compound III being the most acidic compound O favor the left side with compound I being the most acidic compound O favor the left side with compound III being the most acidic compound O the reaction is at equilibrium so all the compounds are in equal concentration
Favour the right side with compound I being the most acidic compound.Option (b) is correct
Because carbonyl is electron withdrawing group.out of halogen fluorine is most electronegative so it's show it's negative inductive effect and inductive effect is maximum upto 3 atom.in option( b) it is near to carbonyl . Electron withdrawing group increase acidic strength and halogen are electron withdrawing group,out of all halogen Fluorine is most electron withdrawing atom .The substance is acidic if there are more positively charged hydroniums than negatively charged hydroxyls. If there are more positively charged hydroniums than negatively charged hydroxyls, the compound becomes basic.. The term "potential (or power) of hydrogen" actually denotes pH.
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What is the molar mass of Carbon atoms in 1 mole of trolamine (C6H15NO3)?
Be sure to include the mass of all elements in the formula.
14.01g
48.00g
15.15g
72.06g
The molar mass of carbon atoms in 1 mole of trolamine is 72.06 g where the molar mass of compound is 149 g.
What is molar mass?Molar mass of a compound or a molecule is defined as the mass of the elements which are present in it.The molar mass is considered to be a bulk quantity not a molecular quantity. It is often an average of the of the masses at many instances.
Molar masses of an element are given as relative atomic masses while that of compounds is the sum of relative atomic masses which are present in the compound.
Molar mass of carbon atoms in 1 mole of trolamine is given as, 12.011×6=72.06 g
Thus, the molar mass of carbon atoms in 1 mole of trolamine is 72.06 g where the molar mass of compound is 149 g.
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with reference to their rf values, rank the four amino acids in terms of their solubility in the solvent used
The four amino acids that are ranked in terms of their solubility in the solvent used, according to the Rf values, are Leucine, Arginine, Alanine, and Glycine.
What is Rf value?The retention factor (Rf value) is important in chromatography because it can be used to predict where a specific substance will be located on the chromatogram. This is due to the fact that the Rf value measures how far a specific substance has traveled relative to the solvent front.The presence of a high retention factor indicates a strong interaction between the compound of interest and the surface. This also implies that the compound of interest is highly soluble in the mobile phase.Moving molecules with a small Rf are less soluble in the hydrophobic (non-polar) solvent they are larger and also have a greater affinity towards the hydrophilic paper than molecules with a larger Rf.To learn more about Rf value refer to :
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to make a 1% solution of glucose, you would dissolve gram(s) of glucose into enough water to make a 100ml solution.
To make a 1% solution of glucose, 1 gram of glucose would be needed to be dissolved into enough water to make a 100ml solution.
Weight/Volume percentage of a solution is defined as the percentage of mass of the solute in grams per 1 ml of volume of the solution. It is denoted by W/V%
W/V% = [tex]\frac{W}{V}[/tex] × [tex]100[/tex] .....[tex]eq[/tex]
Here, V = Volume of the solution in milliliters (ml)
W = Weight of the solute in solution in grams (g)
Volume of solution given in the question = 100 ml
W/V% of solution given in the question = 1 %
Thus putting the values in the [tex]eq[/tex] , we get
Mass or Weight of glucose needed to be dissolved in the solution (W):
= [(W/V%) × [tex]V[/tex]] / [tex]100[/tex]
= ([tex]1[/tex] × [tex]100[/tex]) / [tex]100[/tex]
= 1 gram
Hence, one gram of glucose is needed to be dissolved in a 100 ml solution to make it a 1 % solution of glucose.
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Multiply these in scientific notation
(4.1 × 10°) x (3 x 10-6)
Oa
7.1 x103
Ob
1.23 x 102
O c
7.1 x103
O
d
3.21 x 102
The result of the multiplication of given number in scientific notation is 1.23 × 10⁻⁵. The power of 10 is added in the muiltipication.
What is scientific notation ?Scientific notation is a standard and scientific way of representing numbers. In scientific notation, the numbers are converted with powers of ten. For example a number 5 can be written as 5 × 10°. Similarly 500 can be written as 5 × 10².
The first term in the scientific notation 4.1 × 10° = 4.1 . since 10° = 1.
second terms, 3 × 10 ⁻⁶. Multiply it with 4.1
= 4.1 × 3 × 10 ⁻⁶ = 12.3 × 10 ⁻⁶ = 1.23 × 10⁻⁵.
Therefore, the final answer in scientific notation is written as: 1.23 × 10⁻⁵.The power ten is increased when we move the decimal point to the left.
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Figure 16.2 summarizes the classic method for separating a mixture of common cations by selective precipitation. Explain the chemistry involved with each of the four steps in the diagram.
With the aid of a reagent that precipitates one or more ions while leaving others in solution, ions in an aqueous solution can be separated using the selective precipitation technique.
What does "selective precipitation" entail?With the aid of a reagent that precipitates one or more ions while leaving others in solution, ions in an aqueous solution can be separated using the selective precipitation technique. For metallic elements, conduct a qualitative analysis.Proteins can be selectively precipitated in a variety of ways, including as a bulk technique to recover the majority of the proteins from a crude lysate, a selective technique to fractionate a subset of proteins from a protein solution, or a very specific technique to recover a single protein from a purification step.To learn more about precipitation technique refer to:
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Ethene (C2H4) reacts with halogens (X2) by the following reaction:
C2H4(g) + X2 == C2H4X2(g)
The following figures represent the concentrations at equilibrium at the same temperature when X2 is Cl2 (green), Br2 (brown), and I2 (purple). List the equilibria from smallest to largest equilibrium constant. [Section 15.3]
The correct order for equilibrium constant = K₁ > K₂ >K₃
What is meant by equilibrium?
Alkene ethene and elemental halogen X2 are both used. Halogenation reaction is the name given to the reaction between an alkene and a halogen.The electrophilic addition mechanism is used in this reaction. Elctrophile, X+, is produced in this reaction by elemental halogen (X2).The double bond in the alkene draws this electrophile and binds it to it.Electrophile addition causes the production of a carbocation intermediate.Nucleophile attacks this positive carbon, leading to the production of a 1,2-di halide alkane as a consequence.Ethene (C2H4) and halogen (X2) combine to form 1,2 - dihalide ethane (C2H4X2). The graphic depicts the reaction of halogen (X2) with chlorine (Cl2).On applying this concept in figures :
Given : Green = Cl₂ Brown = Br₂ Purple = I₂ Grey = Ethene
Grey + Green = 1,2- dihalide ethane
a) Number of Cl₂(green ) = 2
number of ethane ( grey ) = 2
Number of 1,2-dichloride alkane( grey + green ) = 8
Plugging these number in equilibrium constant expression :
[tex]k_{1} = 8/ 2*2=8/4=2[/tex]
Hence K₁ for ethene + chlorine = 2
b) Number of Br₂(brown ) = 4
number of ethane ( grey ) = 4
Number of 1,2-dibromide alkane( grey + brown ) = 6
On plugging these values in K expression as :
[tex]K_{2} = 6/4*4=6/16=0.0612[/tex]
Hence K₂ for ethen + Bromine = 0.375
c) Number of I₂(purple ) = 7
number of ethane ( grey ) = 7
Number of 1,2-diiodide alkane( grey + purple ) = 3
On plugging values in K expression as:
[tex]K_{3} = 3/7*7=3/49=0.0612[/tex]
Hence K₃ for ethene + Iodine = 0.0612
So , the order of equilibrium constant (K) from largest to smallest :
K₃ = 0.0612 K₂ = 0.375 K₁= 2
K₁ > K₂ >K₃
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If a channel of a particular cell preferentially transmits smaller ionic species across the membrane, given the following biologically relevant, isoelectronic ions, the channel is LEAST likely to transmit:
A.S2−
B.Cl−
C.K+
D.Ca2+
The channel is least likely to transmit smaller ionic species is D. Ca2+.
What are ions?
Ions are atoms or molecules that have an unequal number of protons and electrons, giving them a net electric charge. The charge can be positive (called cations) or negative (called anions). Ions are formed when atoms gain or lose electrons through chemical reactions or physical processes.
Ca2+ ions are larger than S2-, Cl- and K+, and therefore, it would be harder for a channel that preferentially transmits smaller ionic species to transmit Ca2+ ions across the membrane. The other ions mentioned (S2-, Cl- and K+) are all smaller than Ca2+ and therefore would be more likely to be able to pass through the channel.
It's important to note that this is a hypothetical scenario and the actual ion selectivity of a particular ion channel can depend on many factors like the size and charge of the ion, the structure of the channel pore and the presence of other molecules. It's also important to note that not all ion channels are selective and some allow multiple ions to pass through.
Therefore, the Ca2+ channel is least likely to transfer smaller ionic species.
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Which of the following is an example of water in a liquid state?
Question 6 options:
Steam
Snow
Rain
Ice
polar molecules have attractive dipole-dipole interactions when the dipoles are arranged in which of the following geometries?
When the dipoles are organized in head-to-tail; antiparallel and side-to-side geometries, polar molecules exhibit attractive dipole-dipole interactions. molecules that are polar.
Because PCl₃ is polar, dipole-dipole attractions will occur. Nonpolar F₂, ionic FeCl₂, and nonpolar CO₂. Dipoles develop in amplitude as covalent bonds get more polar, and hence dipole-dipole attractions expand in size. Dipole-dipole interactions occur when partial charges produced inside one molecule are attracted to an opposing partial charge in a neighboring molecule. Polar molecules align so that the positive end of one molecule interacts with the negative end of another.
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The actual question is:
Polar molecules have attractive dipole-dipole interactions when the dipoles are arranged in which of the following geometries?(Select all that apply)
head-to-tail; side-to-side; antiparallel; diagonal; round and round
What is the charge of the monatomic cation usually formed by each of the following metals? Remember to include the sign with each charge, and enter the number along with the correct sign of the charge in each case. (Do NOT re-enter the element symbols.)Zn Ag Cd
The charge of the monatomic cation usually formed by each of the following metals is: Zn: +2, Ag: +1, Cd: +2.
It's important to note that the charge of a cation is determined by the number of electrons that the atom loses to form the cation. The charge of a cation can be determined by looking at the element's position in the periodic table and its electron configuration, and also by knowing the common oxidation states of the elements. Some elements tend to lose electrons more readily than others, and that's why they form cations with different charges. A monoatomic cation is a cation (an ion with a positive charge) that is composed of only one atom. It is formed when an atom loses one or more electrons, leaving it with a net positive charge. Monoatomic cations are commonly formed by metals, which tend to lose electrons to form cations with a positive charge. The charge of a monoatomic cation is determined by the number of electrons that the atom loses to form the cation.
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Perform each of the following operations and report your final answer with the correct number of significant figures and in scientific notation. Explain(65.0×1.07)/14=170-3.33+24.9 =99.670+24.52-0.3=
The correct number of significant figures for (65.0×1.07)/14 is 2, for 170-3.33+24.9 is 3 and 99.670+24.52-0.3 is 4.
The critical figures of a number are the crucial or significant digits that accurately convey the meaning of that number. 6.658, for instance, has four significant digits. These huge amounts give the numbers accuracy. Additionally, they are known as significant digits. The 2, 4, 5, and last 0 of the number 0.2540 are significant. Additionally significant are the zeros before and after numerals and the decimal point. Exponential digits are not significant in scientific notation; the three significant digits in 1.12106 are 1, 1, and 2.
Given the various operations to be carried out as:
(a) (65.0×1.07)/14 = 4.9678 = 5.0
The number of significant figures = 2
(b) 170-3.33+24.9 = 191.57 = 192
The number of significant figures = 3
(c) 99.670+24.52-0.3 = 123.89 = 123.9
The number of significant figures = 4
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P4 + 5O2 → 2P2O5
How many grams of P2O5 would be produced with 2 moles of P4 used?
________ g P2O5
The answer is 567.76 grams.
We used the balanced equation for the reaction of P4 + 5O2 → 2P2O5. This equation tells us that for every 1 mole of P4 that reacts, 2 moles of P2O5 are produced.
Therefore, if we start with 2 moles of P4, we would end up with 4 moles of P2O5. To find the mass of 4 moles of P2O5, we can use the molar mass of P2O5 which is 141.94 g/mol.
To find the mass, we multiply the number of moles by the molar mass, so 4 moles * 141.94 g/mol = 567.76 grams.
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What is the empirical formula for this crystalline material
The empirical formula for the given crystalline material is Cu₁₆O₂₀YBa₂
What is the empirical formula of a compound?The empirical formula of a compound is the simplest formula of a compound that shows the simplest ratio in which the elements are present in a compound.
The simplest whole-number ratio of atoms in a chemical molecule is its empirical formula. Sulfur monoxide's empirical formula, SO, and disulfur dioxide's empirical formula, S₂O₂, are two straightforward examples of this idea. Both have the same empirical formula of SO.
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F and G react together. When the concentration of F is tripled and the concentration of G remains constant, there is a nine-fold increase in the rate of the reaction. What is the order of the reaction with respect to F?
There is a nine-fold rise in the pace of the reaction when the concentration of F is tripled but the concentration of G stays the same. The response is in the second order relative to F.
What happens to rate of reaction if concentration is tripled?If you increase one reactant's concentration in a third order reaction involving two reactants by three times, the rate rises by a factor of three. If a reactant is first order, its concentration will cause a doubling in the reaction's rate; a tripling in the reaction's rate, etc. If a reactant is third order, its rate of reaction will increase by a factor of 8 when its concentration is doubled (23 = 8), etc.
The concentration of a reactant does not impact the rate. The rate remains unchanged even if the concentration is doubled. The given rate law needs to be written first. The concentrations of A and B will be increased by three times each after that.
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From 23g of ethanol are obtained,36g ethylethanoate by esterification with ethanoic acid in the presence of concentrated
In the presence of concentrated sulphuric acid as a catalyst, ethanol interacts with ethanol to form the ester, ethyl ethanoate. The response is gradual and reversible.
How does the mechanism work?In the presence of concentrated sulphuric acid as a catalyst, ethanol interacts with ethanol to form the ester, ethyl ethanoate. The response is delayed and can be reversed. To reduce the possibility of a reverse reaction, the ester is distilled out as soon as it is generated.
Because it makes the process less unclear, all of the stages in the mechanism below are depicted as one-way reactions. The reverse reaction is performed so differently that it influences how the mechanism is stated. If you’re interested, there’s a link to ester hydrolysis farther down the page.
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Dunes can be up to 300
meters tall! What is a
dune?
A. what is left behind when the
wind blows all of the sand away
B. a mound of sand piled up by
the wind
C. a very large cave
D. a very common occurrence in
wet and rainy areas
Answer:
B. a mound of sand piled up by the wind.
Explanation:
It is option B because a dune is a natural feature formed by the wind blowing sand particles and piling them up in a specific area. The wind can shape the dune and cause it to grow taller, sometimes reaching heights of 300 meters or more. Dunes are not caused by the wind blowing sand away, as stated in option A, nor are they found in wet and rainy areas, as stated in option D, they are typically found in desert regions or along coastlines. It is not a cave as stated in option C.
The next few problems deal with calculating the pH of solutions of weak acids/bases (buffers). Here, we need to use the Henderson-Hasselbalch equation,
which relates pH, pKa (-log10Ka), and the ratio of the concentration of congugate acid (HA) and conjugate base (A-) as follows:
pH = pKa + log10([A-]/[HA])
You wish to prepare 150. milliliters of 0.0900 M sodium acetate, pH 4.80, from glacial acetic acid [a liquid; concentration = 17.5 M, pKa = 4.76] and sodium hydroxide [a solid; purity 99.9%; MW = 40.0].
1. What volume (in milliliters) of glacial acetic acid would you need to make the buffer?
2. What mass (in grams) of NaOH would you need to prepare 25.0 mL of 1.00 M NaOH?
3. What volume (in milliliters) of the 1.00 M NaOH would be needed to adjust the pH to 4.80?
To prepare 150 mL of 0.0900 M sodium acetate, pH 4.80, we need 74.72 mL of glacial acetic acid, 25 g of NaOH, and 12.6 mL of 1.00 M NaOH.
1. To prepare 150 mL of 0.0900 M sodium acetate, we need to use the Henderson-Hasselbalch equation, which relates pH, pKa (-log10Ka), and the ratio of the concentration of conjugate acid (HA) and conjugate base (A-).
pH = pKa + log₁₀([A-]/[HA])
[A-] = 0.0900 M, [HA] = 17.5 M, pKa = 4.76
To calculate the volume of glacial acetic acid needed, we can use the following equation:
pH = pKa + log₁₀([A-]/[HA])
We know that pH = 4.80, [A-] = 0.0900 M, pKa = 4.76
Therefore, log10([A-]/[HA]) = pH - pKa = 4.80 - 4.76 = 0.04
[A-]/[HA] = 10⁰·⁰⁴ = 1.82
[HA] = [A-]/1.82 = 0.0900 M/1.82 = 0.0495 M
Then, we can calculate the volume of glacial acetic acid needed by using the following equation:
V = n / C = (n / V) x V = (0.0495 M x 150 mL) / 0.0900 M = 74.72 mL
2. To prepare 25.0 mL of 1.00 M NaOH, we can use the following equation:
m = n / V = (n / C) x V = (1.00 M x 25.0 mL) / 1 = 25.0 g
3. To adjust the pH to 4.80, we need to use the Henderson-Hasselbalch equation again, and we can calculate the volume of 1.00 M NaOH needed.
pH = pKa + log₁₀([A-]/[HA])
We know that pH = 4.80, [A-] = 0.0900 M, pKa = 4.76
Therefore, log₁₀([A-]/[HA]) = pH - pKa = 4.80 - 4.76 = 0.04
[A-]/[HA] =10⁰·⁰⁴ = 1.82
[HA] = [A-]/1.82 = 0.0900 M/1.82 = 0.0495 M
The initial [HA] = 17.5 M, thus we need to add 1.82 x 0.0495 M = 0.088 M of NaOH to increase the [A-] and decrease the [HA] to reach the desired pH.
V = n / C = (n / V) x V = (0.088 M x 150 mL) / 0.0900 M = 12.6 mL
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A chemist adds 265.0 mL of a 0.122 M barium chlorate (Ba(CIO3)2) solution to a reaction flask. Calculate the mass in grams of barium chlorate the chemist has added to the flask.
The chemist added 0.1424 g of barium chlorate to the flask.
To calculate the mass of barium chlorate added to the reaction flask, we need to use the formula: mass = molarity x volume x molar mass.
First, we need to find the molar mass of barium chlorate. The molar mass is calculated by adding the molar masses of all the atoms in the compound.
The formula for barium chlorate is Ba(CIO₃)₂, which means it is made up of one barium atom (Ba), two chlorine atoms (Cl), six oxygen atoms (O), and two iodine atoms (I).
The molar mass of barium is 137.327 g/mol, chlorine is 35.453 g/mol, oxygen is 15.999 g/mol, and iodine is 126.904 g/mol.
So the molar mass of barium chlorate is (137.327 + 235.453 + 615.999 + 2×126.904) g/mol = 479.205 g/mol.
Next, we need to use the formula mass = molarity x volume x molar mass. We know that the molarity is 0.122 M, the volume is 265.0 mL and the molar mass is 479.205 g/mol. So we can plug these values into the formula: mass = 0.122 x 0.265 x 479.205.
After converting the volume to L and using the formula, we get 0.1220.265479.205 = 0.1424 g.
So the chemist added 0.1424 g of barium chlorate to the flask.
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which of the statements best describes the carbon-carbon length and strength for the following compounds
The correct option is (2) i.e. Benzene and p-disubstituted benzene do not have alternating single and double Carbon-Carbon bonds. The C-C bond lengths in these compounds are all similar.
Benzene is a six-carbon aromatic hydrocarbon with a hexagonal ring structure and is characterized by its distinctive aroma. The carbon-carbon (C-C) bonds in benzene are intermediate in length between a single bond and a double bond, and are referred to as "aromatic" or "delocalized" bonds. This means that the electrons in the bonds are spread out over the entire ring, rather than being localized between two adjacent carbon atoms. p-Disubstituted benzene is a type of substituted benzene in which one or more of the hydrogens in the benzene ring have been replaced with a different group. Substitution of the benzene ring often leads to changes in the physical and chemical properties of the molecule. However, the C-C bond lengths in p-disubstituted benzene still have an average value that is between the values for the average C-C single bond length and the average C-C double bond length.
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Question - Which one of the following statements best describes the C-C bond lengths in benzene and p-disubstituted benzene?
1) Benzene and p-disubstituted benzene have alternating single and double C-C bonds. These bond lengths are not similar to values for the average C-C single bond length and the average C-C double bond length, respectively.
2) Benzene and p-disubstituted benzene do not have alternating single and double C-C bonds. The C-C bond lengths in these compounds are all similar, and have an average value that is between the values for the average C-C single bond length and the average C-C double bond length.
3) Benzene and p-disubstituted benzene have alternating single and double C-C bonds. These bond lengths are similar to values for the average C-C single bond length and the average C-C double bond length, respectively.
Place the steps required to determine whether or not a precipitate forms when two solutions are mixed in the correct order. Start with the first step at the top of the list. ++ Place these in the proper order. Note the ions present in the reactants. Use the solubility rules to determine whether or not either of the combinations gives an insoluble salt. Consider possible cation-anion combinations. Do you know the answer? No Idea Unsure Think so I know it Read -
1. Take note of the ions present in the reactants to determine the right order. 2. Consider various cation-anion pairings. 3. To ascertain if one of the combinations results in an insoluble salt, use the solubility criteria.
Positively charged ions are known as cations. Negatively charged ions are referred to as anions. A charged atom or molecule is an ion. A balanced atom will change into a positively charged cation if one or more of its electrons are lost. A balanced atom will change into a negatively charged anion if it gains one or more electrons. Ions include both anions and cations. They are drawn to one another because their electrical charges are in opposition. While an anion repels an additional anion, a cation repels other cations. An ion that has acquired one or more electrons and now has a net negative charge is called an anion.
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