Answers
Answer:
too lendi to answer the question
Related Questions
suppose you performed a titration of a weak acid and you found that the equivalence point occurred at 11.38 ml of added naoh. at what volume would you use the ph to determine the pka of the acid? enter your answer numerically to three significant figures.
Answers
At volume 6.78ml, pH will be equal to pKa of the acid.
According to the Henderson- Hasselbach equation,
pH= pKa + log {A-}/ {HA}
where {A-} is the concentration of conjugate base and
{HA} is the concentration of weak acid
At the equivalence point, the volume of base added is just enough to exactly neutralize all the acid.
At one half of this volume of added base, called the half equivalence point, enough has been added to neutralize half of the acid. Since, half of the acid reacted to form A-, the concentration of A- and HA-, at the half equivalence point are the same.
ph= PKA+log1
pH= pKa (log1=0)
Therefore, V eq = 13.57ml
V 1/2 eq= 13.57/2
=6.78ml
Hence, at volume 6.78ml, pH will be equal to pKa of the acid.
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Consider this skeleton equation:
Mg + Mn2O3 → MgO + Mn
Which of the following is the correct, balanced chemical equation?
Answers
Answer:
3Mg + Mn2O3 --> 3MgO + 2Mn
Explanation:
To know whether an equation is balanced, make sure to count how many atoms of a specific element are in each side.
In these options, the only one that has the same amount on each side is option 2.
On the reactant side, we have:
3 Mg, 2 Mn, and 3 O
On the product side, we have:
3 Mg, 2 Mn, and 3 O
If you have a coefficient in front of the molecule, that means that there is that amount of each element. For example 3 MgO, there is 3 Mg and 3 O.
If you have a subscript (the small number) after the element, that means there is specifically that amount of atoms of that element. For example Mn2O3, there is specifically 2 Mn and 3 O.
Write a Final Argument Paragraphs
Write below about the information of Subclaim 2
Subclaim 2: Bacteria from the fecal transplant can help the patients body produce immune cells that kill invading bacteria.
Answers
An argument about subclaim 2 about bacteria from fecal transplants and how it can help the patient's body produce immune cells that kill invading bacteria is given below:
This bacteria that is gotten from fecal transplants can help boost immunity and kill harmful and invading bacteria, they do this by filling up the space in the gut, and this helps to fight invading bacteria.
What is Bacteria?This refers to the free-living organisms that can be found in a biological cell of an organism.
Hence, we can see that an argument about subclaim 2 has been given above and is well explained.
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trail, d., savage, p.s., moynier f. (2019) experimentally determined si isotope fractionation between zircon and quartz. geochim. cosmochim. acta, 260, 257-274.
Answers
Zircon and detrital quartz have the potential to provide information regarding scalar changes to the Earth's weathering processes and silicon isotope composition. Due to the fact that there are currently few data on the Si isotope equilibrium fractionation of minerals, determining the source melt Si isotope composition from out-of-context minerals is difficult.
The term "quartz" comes from the Polish words "kwardy" and "twardy," both of which imply "hard" in English. Quartz is an igneous rock made up of silicon and oxygen atoms in a continuous structure called silicon-oxygen tetrahedra (SiO4). The ultimate chemical formula of quartz is SiO2, which is recognized in science as the result of the sharing of each oxygen atom between two tetrahedra atoms. In terms of mineral abundance in the continental crust of the earth, quartz is second only to feldspar. The two types of quartz which are known as regular alpha quartz and high-temperature beta quartz are both chiral materials. All of the alpha-to-beta quartz transformations take place at temperatures below 573 degrees Celsius.
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Which statement best describes why a chemical change is different from a physical change?
A. A chemical change is used to identify characteristics of a substance, and a physical change identifies the behavior of a substance when in a reaction.
B. A chemical change is used by scientists to create new substances, and a physical change happens naturally.
C. A chemical change results in a different state of matter, and a physical change results in a new substance being formed.
D. A chemical change results in a new substance being formed; whereas, a physical change will result in a different state of matter.
Answers
Lithium has two naturally occurring isotopes, 6Li (abundance 7%) and 7Li
(abundance 93%). Calculate the relative atomic mass of lithium, giving your
answer to 2 decimal places.
Answers
Answer:
6.93
Explanation:
(0.07)6 + (0.93)7 = 0.42 + 6.51 = 6.93
in this lab, we do not measure the amount of chlorine in sample. we need the amount of chlorine to determine the formula of the compound. how do we determine the amount of chlorine in the compound?
Answers
The molecular formula bonattite is CuSO₄·3H₂O.
What is molecular formula?Two or more atoms that have been chemically bonded make up a molecule. A molecular formula is the chemical representation of a molecular compound that lists the types and quantities of atoms that make up each molecule.
We have 0.0281 moles H₂O.
We have 0.00936 moles Copper.
We have 0.00936 moles sulfate.
Mole ratio : For 1 mol Cu we have 1 mol sulfate and 3 moles H₂O.
The molecular formula is CuSO₄·3H₂O
After heating the sample lost 0.506 grams of mass
After reacting with aluminum wire, 0.595 g of Cu was recovered.
So, Moles H₂O = mass H₂O / molar mass H₂O
Moles H₂O = 0.506 grams / 18.02 g/mol
Moles H₂O = 0.0281 moles H₂O
Now, Moles Cu = 0.595 grams / 63.55 g/mol
Moles Cu = 0.00936 moles Cu
For 1 mol of Cu we have 1 mol (SO₄)⁻²
For 0.00936 moles Cu we have 0.00936 moles (SO₄)⁻²
We have 0.00936 moles CuSO₄.
Step 5: Calculate the molecular formula
The molecular formula is CuSO₄·H₂O
To find x we have to divide the number of moles H₂O by the number of moles CuSO₄
x = (0.0281 mol of H2O) / (0.00936 mol of CuSO₄)
x = 3.00
The molecular formula is CuSO₄·3H₂O.
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Here is the complete question " In this lab, we do not measure the amount of chlorine in the sample, We need the amount of chlorine to determine the formula of the compound. How do we determine the amount of chlorine in the compound? The mineral bonattite is known to be a copper sulfate hydrate. 2.000 grams was heated to release the water for form the anhydrate. The sample lost 0.506 g of mass. After reacting with aluminum wire, 0.595 g of copper was recovered. How many motes of water, copper and sulfate were in the compound? What is the mole ratio of these 3 components? What is the formula of bonattite?".
A specialty food store received orders for 725 fruit baskets during the 7-day period leading up to a major holiday. According to the fruit basket recipe shown, how many strawberries will the specialty store need to fulfill all 725 orders? 1 fruit basket = 4 oranges (O) + 3 apples (A) + 2 pears (P) + 6 strawberries (S) 1 fruit basket = 4O + 3A + 2P +6S ⟶ O4A3P2S6
Answers
The fruit basket recipe will the specialty store need to fulfill all 725 orders is 120 strawberries.
What is fruit basket?Fruit basket is defined as a gift basket filled with a variety of fruits.
A fruit basket can be called as a punnet is a compact box or square basket used for gathering, transporting, and selling fruits and vegetables, typically for small berries.
As one basket has 6 strawberries.
So, for completing 725 order we need
= 725 / 6
= 120.8 = 120 strawberries
Thus, the fruit basket recipe will the specialty store need to fulfill all 725 orders is 120 strawberries.
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A mixture of co(g) and o2(g) in a 1.0-l container at 1.0 * 103 k has a total pressure of 2.2 atm. after some time, the total pressure falls to 1.9 atm as the result of the formation of co2. determine the mass (in grams) of co2 that forms.
Answers
The mass of Carbon dioxide gas formed is found to be 0.536g by using the partial pressure and the ideal gas law.
The term "partial pressure" refers to the pressure that one gas in a combination imposes. Partial pressure refers to the pressure exerted by a gas in a gas mixture if it alone inhabited the entire volume occupied by the combination.
We may apply the ideal gas law to address problems related to temperature, volume, pressure for a gas in a mixture if we have a mixture of ideal gases.
Let x atm be the initial partial pressure of oxygen and 2.2 – x atm of carbon monoxide.
[tex]2CO (g) + O_2 (g) \rightarrow 2CO_2 (g)[/tex]
I: 2.2-x x
C: -2y -y 2y
E: 2.2-x-2y x-y 2y
Therefore,
(2.2 – x – 2y) + (x – y) + 2y = 1.9
2.2 – y + 1.9
y = 2.2 – 1.9
y = 0.3 atm
Partial pressure of [tex]CO_2[/tex] (g) formed = 2y = 0.6 atm
Now,
PV = nRT
PV = (Mass/Molar mass) x RT
Mass = (Molar mass x PV) / RT
Mass = 44 x 1atm x 1L / 0.082 x 1000K
Mass = 0.536g
Result:
The mass of carbon dioxide gas formed is found to be 0.536g.
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Why does oxygen bond with hydrogen in the ratio 1:2 (and how can you apply this concept to other element compounds)?
Answers
Answer:
This is because oxygen requires two electrons to gain stability, while hydrogen has only one olectron, therefore two hydrogen atoms are required
Determine the temperature Kelvin of CO2(g) having a root mean square velocity of 4.37 * 10 ^ 2 m/s
Answers
Answer:
The temperature is 336.9K.
Explanation:
To calculate the temperature of CO2, it is necessary to replace the values of CO2 molar mass (0.044kg/mol), gas constant (R=8.314J/mol.K) and in this case the root mean square velocity (4.37x10^2m/s) in the root mean square velocity formula:
[tex]\begin{gathered} V_{rms}=\sqrt{\frac{3*R*T}{m}} \\ 4.37*10^2\frac{m}{s}=\sqrt{\frac{3*8.314\frac{J}{mol*K}*T}{0.044\frac{kg}{mol}}} \\ (4.37*10^2\frac{m}{s})^2=\frac{3*8.314\frac{J}{mol*K}*T}{0.044\frac{kg}{mol}} \\ 190,969\frac{m^2}{s^2}=566.86\frac{J}{kg*K}*T \\ \frac{190,969\frac{m^2}{s^2}}{566.86\frac{J}{kg*K}}=T \\ 336.9K=T \end{gathered}[/tex]So, the temperature is 336.9K.
Air is made up of different gases, such as oxygen, nitrogen, and carbon dioxide.
Which statement best describes these three components of air?
Oxygen, nitrogen, and carbon dioxide are all classified as pure substances.
Oxygen, nitrogen, and carbon dioxide cannot react with another substance.
Oxygen, nitrogen, and carbon dioxide are chemically bonded to one another.
Oxygen, nitrogen, and carbon dioxide can be classified as elements.
Answers
Answer: its thee 3rd one I'm pretty sure.
Explanation:
Answer:
C
Explanation:
They are chemically bonded is the truest of all
What most accurately explains whether liquid water or ice has a higher density, and why?
Answers
Hydrogen bond is a type of intermolecular force, a strong bond that is formed due to a dipole-dipole attraction, and it will occur when Hydrogen atom bonds with strongly electronegative atoms, like F, O or N. According to this explanation, let's analyze the options:
A) Hydrogen bond will not occur between two hydrogen atoms, because there is no dipole being formed between them
B) It is not a covalent bond, since it is an interaction between molecules and not atoms, and another reason is that H bonds are strong in terms of dipoles, and covalent bondings will not have that electronegative difference
C) Water is a polar molecule, and that would be a reason for why we have hydrogen bonds
D) Since hydrogen bonds are based on a strong difference in electronegativity, it is considered to be a strong interaction
E) As I wrote in the explanation, yes this interaction between H and O will represent a hydrogen bond
F) Yes! When we talk about hydrogen bonds, we are talking about interaction between molecules and not atoms
Correct:
C
E
F
Calculate the number of C70 molecules that can be made from one mole of
carbon atoms.
The Avogadro constant = 6.02 × 1023 per mole
[3
Answers
The third and last allotropic form of carbon, following diamond and graphite, is C70 fullerene. The name C70 fullerene refers to the fullerene molecule with 70 carbon atoms.
Let's think about the molecule of carbon dioxide. Since we are aware of its chemical formula, CO2, we can infer that each mole of carbon dioxide comprises 6.02 x 1023 molecules.
The Avogadro's constant is a factor that's used to estimate how many particles are present in a specific substance.
The expression for Avogadro's constant in scientific notation is:
6.02214076×10²³ mol⁻¹.
The amount of particles in 1 mole of a substance is determined by Avogadro's constant, a proportionality factor.
It is comparable to 602,252,000,000,000,000,000,000,000 in ordinary units.
In this way, the avogadro constant can be written as 6.022140761023 mol 1 or 602,252,000,000,000,000,000.
One mole of carbon and two moles of oxygen make up one mole of CO2, or 6.023 x 1023 C atoms and 12.04 x 1023 O atoms, respectively. Avogadro's number, which equals 6.023 x 1023, indicates how many atoms or molecules are contained in one mole of a substance. 6.023 x 1023 CO2 molecules make up one mole of carbon dioxide.
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The diagram below shows some subatomic particles.
An outer circle, labeled X, surrounds three smaller circles; one of these is labeled Quark. The three inner circles are connected by a line from each circle to a point at the center of the large circle; the three lines resemble the letter Y.
Which of these statements best identifies the particle that is labeled with an X?
It is either a nucleus or a proton.
It is either a proton or a neutron.
It is either a neutron or an electron.
It is either an electron or a nucleus.
Answers
Answer:
c
Explanation:
Answer:
C
Explanation:
in the industrial synthesis of acetic acid, methanol is reacted with carbon monoxide. the balanced equation for this reaction is ch3oh (g) co (g) → ch3cooh (l) how many grams of co (g) are required to produce 16.6 moles of acetic acid?
Answers
In the industrial synthesis of acetic acid, methanol is reacted with carbon monoxide. The grams of CO(g) required to produce 16.6 moles of acetic acid is 46.4 g.
The balanced chemical equation for the given reaction is -
CH₃OH(g) + CO(g) → CH₃COOH(l)
We know that,
Moles of acetic acid = 16.6 mol
First, we will calculate moles of CO by-
1 mole of acetic acid is produced by 1 mole of CO
16.6 mole of acetic acid is produced by 1 x 16.6 moles of CO
1
Moles of CO = 16.6 mol
To calculate grams of CO -
Number of moles = Given mass
Molar mass
Mass of CO can be calculated as - moles x molar mass
Mass of CO = 16.6 mol x 28 g/mol
Mass of CO = 46.4 g
Hence, grams of CO required is 46.4 g
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electron pairs repel, molecules adjust their shapes so that valence electron pairs are as far apart as possible
A) Valence-shell electron-pair repulsion theory(VSEPR)
B) Electrical Conductivity
C) Lewis Dot Structures
D) Roman numerals
Answers
Answer:
A - VSEPR
Explanation:
The concept being explained here is VSEPR theory, which helps explain molecular geometry. In this theory, electron domains (electron pairs and bonds) repel, so the electron domains are arranged where they are far away from each other. Electron pairs are more repulsive than bonds, and thus will orient themselves such that they are not close to one another.
the reaction 2no(g) br2(g) 2nobr(g) has a kp value of 109 at a particular temperature. if the equilibrium partial pressure of br2 is 0.108 atm and the equilibrium partial pressure of nobr is 0.482 atm, what is the equilibrium partial pressure of no?
Answers
The equilibrium pressure of the NO is given by 0.14 atm
What is the equilibrium constant?We define the equilibrium constant as the value that shows the extent to which the reactant is converted to product. If the value of the equilibrium constant have been calculated to be large then most of the reactants have been converted to products.
We can write;
K = [NOBr]/[NO]^2 [Br2]
We now need to make the equilibrium concentration of the NO the subject of the formula as follows;
K[NO]^2 [Br2] = [NOBr]
[NO] = [NOBr]/K [Br2]
[NO] = √0.482^2/109 * 0.108
[NO] = √0.232/11.77
= 0.14 atm
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a 0.561 m solution of an unknown electrolyte depresses the freezing point of water by 2.93 c. what is the van't hoff factor for this electrolyte? the freezing point depression constant, kfp, for water is -1.86 c/m
Answers
The value of van't Hoff factor for the electrolyte is i = 0.28
Molarity of solution = 5.61 m
The temperature which depresses the freezing point of water = 2.93 °C
The freezing point depression constant, kfp, for water = 1.86 °C kg[tex]mol^{-1}[/tex]
To find the van't Hoff factor, let's use the following formula.
ΔTf = kf × molality × i
Here ΔTf = depression fo freezing point
kf = freezing point depression constant
i = Van't Hoff's factor
Now substitute the values in the above formula.
2.93 = 1.86 x 5.61 x i
i = 2.93 / 1.86 x 5.61
i = 2.93 / 1.043 = 0.28
Hence, the value of van't Hoff factor is 0.28
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The complete question is:
A 05.61 m solution of unknown electrolyte depresses the freezing point of water by 2.93 °C. What is van't Hoff factor for this electrolyte? The freezing point depression constant (Kf) for water is 1.86 °C kg[tex]mol^{-1}[/tex].
enter a balanced compleenter a balanced complete ionic equation for na3po4(aq) fecl2(aq)→fe3(po4)2(s) nacl(aq)te ionic equation for lioh(aq) hno3(aq)→h2o(l) lino3(aq)
Answers
The balanced chemical equation for Na₃PO₄ and FeCl₂:
2 Na₃PO₄ (aq) + 3 FeCl₂ (aq) → Fe₃(PO₄)₂ (s) + 6NaCl (aq)
The net ionic equation of HNO₃ and LiOH:
H⁺(aq) + OH⁻(aq) → H₂O (l)
What are the net ionic equations?The net ionic equation is an equation of a chemical reaction that expresses only elements, ions, or compounds, that directly participated in that chemical reaction.
We can write a balanced chemical equation for Na₃PO₄ and FeCl₂:
2 Na₃PO₄ (aq) + 3 FeCl₂ (aq) → Fe₃(PO₄)₂ (s) + 6NaCl (aq)
The complete ionic equation can be written for reaction of Na₃PO₄ and FeCl₂:
6Na⁺ (aq) + 2PO₄³⁻ (aq) + 3 Fe³⁺ (aq) + 6Cl⁻ (aq) → Fe₃(PO₄)₂ (s) + 6 Na⁺ (aq) + 6Cl⁻ (aq)
The balanced chemical equation for HNO₃ and LiOH:
HNO₃ (aq) + LiOH (aq) → H₂O (l) + LiNO₃ (aq)
The complete ionic equation for HNO₃ and LiOH::
H⁺(aq) + NO₃⁻ (aq) + Li⁺(aq) + OH⁻ (aq) → H₂O (l) + Li⁺(aq) + NO₃⁻ (aq)
The net ionic equation of HNO₃ and LiOH:
H⁺(aq) + OH⁻(aq) → H₂O (l)
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For the following reaction, 6.74 grams of chlorine gas are mixed with excess iron. The reaction yields 8.73 grams of iron(III) chloride .
Answers
Answer:22.22
Explanation:22.22
violet light has a wavelength of about 410 nm. what is its frequency? calculate the energy of one photon of violet light. what is the energy of 1.0 mol of violet photons? compare the energy of photons of violet light with those of red light. which is more energetic?
Answers
The frequency and energy of one photon of violet light is 7.317x10^14 s-1, 4.85x10^-19 J, and the energy of 1 mol violet is 291.867 J and the energy of violet light is greater than the energy of red light.
The wavelength is 410 nm (1nm=10^-9 m)
=410x10^-9 m
=4.10x10^-7 m
Frequency is the speed of light upon the wavelength
f=3.0x10^8/4.1x10^-7
f=7.317x10^14 s-1
The energy of a photon is hc/lamda
E=6.626x10^-34x3.0x10^8/4.10x10^-7
E=4.85x10^-19 J
For 1-mole photon energy of a photonxavogadro number
4.85x10^-19x6.02x10^23
291867.23 J
291.867 kJ
The energy of red light is 6.626x10^-26x3.0x10^8/7.0x10^-7
E=2.84X10^-19 J
The energy of violet light is greater than the energy of red light.
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This process happens in such a way that total mechanical energy, equal to the ______ of the kinetic and potential energies, is _______.
Answers
This process happens in such a way that total mechanical energy, equal to the sum of the kinetic and potential energies, is conserved.
What is the mechanical energy process?Potential and kinetic energy are sources from which mechanical energy is generated by converting them into power. Turbines that are powered by steam, water, wind, gas, or liquid fuels are a few examples of this. Before being employed as power, machines are frequently used to convert various sources of energy.
As long as there is no energy loss via friction, the system's mechanical energy remains constant. When the speed increases, the energy would become kinetic energy. As long as there is no energy loss via friction, the system's mechanical energy grows.
When an immovable item starts moving, mechanical energy is converted into kinetic energy.
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Write the molecule name of some molecules you made
Answers
The molecule name of some molecules you made will be Cl2O7 namely dichlorine heptoxide and S2Cl2 namely disulfur dichloride.
How to name molecular compounds?Molecule-shaped inorganic substances are known as molecular compounds. Examples include common compounds like water (H2O) and carbon dioxide (CO2). When compared to ionic compounds like sodium chloride, these compounds are very different (NaCl).
Metal atoms lose one or more of their electrons to nonmetal atoms, resulting in the formation of ionic compounds. Electrostatic attraction draws the resulting cations and anions together.
So what unifies the atoms of a molecule? The atoms in a molecule share their electrons in a way that results in the formation of bonds between atoms rather than ions. Two of these bonds exist between the carbon atom and one of the two oxygen atoms in a molecule of carbon dioxide.
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PLEASE HELP !!!If one sample of water is compared to a sample of water twice its mass, how do the proportions of elements differ?
Answers
If one sample of water is compared to a sample of water twice its mass, by the law of multiple proportions of elements will be differ.
According to the law of multiple proportions, a fixed mass of one element would react mostly with masses of other elements in a ratio of tiny, whole numbers whenever two elements combine to generate more than one compound.
For instance, Dalton was aware that when carbon and oxygen combine in two different ratios, two oxides are produced. For example, a given mass of 100 grams of carbon may react using 133 grammes of oxygen to form one oxide or with 266 grams of oxygen to form the other oxide.
Therefore, with the help of law of multiple proportions it can be determined.
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PLEASE HELP !!!! What would be the mass of AB and A2B3 if the atomic mass of A is 2 units, and the atomic mass of B is 3 units
Answers
Answer:
1. 5
2. 13
Explanation:
1. AB = 2 + 3 = 5
2 A2B2 = 2(2) + 3(3) = 4 + 9 = 13
use information from appendix d to calculate the ph of (a) a solution that is 0.250 m in sodium formate (hcoona) and 0.100 m in formic acid (hcooh), (b) a solution that is 0.510 m in pyridine 1c5h5n2 and 0.450 m in pyridinium chloride 1c5h5nhcl2, (c) a solution that is made by combining 55 ml of 0.050 m hydrofluoric acid with 125 ml of 0.10 m sodium fluoride.
Answers
By using the Henderson-Hasselbalch equation, the pH of the given solutions are 4.17, 8.72, 3.83 respectively.
The Henderson-Hasselbalch equation can be used to determine how much conjugate base and acid should be mixed to create a buffer solution with a certain pH.
pH = pKa + [tex]log_{10}[/tex] ([[tex]A^-[/tex]]/[HA]), where [[tex]A^-[/tex]] stands for the molar concentration of the conjugate base (of the acid), and [HA] for the molar concentration of the weak acid, is how the Henderson-Hasselbalch equation is expressed.
As per Henderson-Hasselbalch equation,
For weak acid buffer, pH = pKa + log ([salt] / [acid])
For weak base buffer, pH = pKa + log ([salt] / [base])
(a) pKa of HCOOH = 3.77
Therefore, pH = pKa + log ([salt] / [acid])
pH = pKa + log ([HCOONa] / [HCOOH])
pH = 3.77 + log (0.250/0.100)
pH = 4.17
(b) pKa of Pyridine = 8.77
Therefore, pH = pKa + log ([salt] / [base])
pH = pKa + log ([Pyridinium chloride] / [Pyridine])
pH = 8.77 + log (0.450/0.510)
pH = 8.72
(c) pKa of HF = 3.17
Therefore, pH = pKa + log ([salt] / [acid])
pH = pKa + log ([NaF] / [HF])
pH = 3.17 + log [(0.10x 125) / (0.05 x 55)]
pH = 3.83
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Place one of the 50 kg boxes in the center of the track. Move the friction bar to “None”. Set the Applied Force box by entering 100 Newtons. You will start the force at the same time you start the stopwatch. You can do that by using the return key on the Simulation and the cursor on the stopwatch.
Answers
The mass of the cart needs to accelerate at 0.75 m/s² is 166.6kg.
The net force on an object is zero but its velocity and direction of motion remain unchanged. The net force is the sum of all horizontal or vertical forces. When the box is not moving, the friction plus the applied force is zero, so the net force is zero. The answer is zero. An object moving at constant velocity has zero acceleration, so the net force is zero.
Newton's second law of motion can be observed by comparing the acceleration of a car and a truck after the same force is applied. It's easy to see that the car accelerates faster than the truck after pushing the car and the truck with equal force. Friction is the force that resists movement between contact surfaces. Friction works in our favor and against us.
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Name: PbCl4
A. lead chloride
B. lead tetrachloride
C. lead(IV) chloride
D. lead chloride (IV)
Answers
Answer:
C. Lead(IV) Chloride
Explanation:
Because PbCl4 has a transition metal we need to indicate the ionic charge using Roman numerals in parenthesis. This is placed directly after the metal.
The name of PbCl₄ is lead (IV) chloride. Therefore, option C is correct.
Lead (IV) chloride (PbCl₄) is a hypothetical compound, it does not exist under normal conditions. The highest oxidation state that lead typically exhibits is +4, but it is highly unstable and tends to be disproportionate to lower oxidation states.
Lead commonly forms compounds such as lead (II) chloride (PbCl₂), where lead has an oxidation state of +2. In PbCl₂, each lead atom is bonded to two chloride ions. This is the most stable and commonly observed form of lead chloride.
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what is the difference between ""drying the organic layer with sodium sulfate"" and ""evaporating the organic solvent?"" (hint: do these imply the same physical/chemical process? how are they the same or different?)
Answers
The difference between drying the organic layer and solvent evaporation is explained below.
When an organic component is extracted, there is always the possibility of traces of water or moisture remaining in the organic layer. To eliminate water from the organic layer, the organic layer is frequently treated with sodium sulfate, a process known as drying the organic layer. The organic layer is concentrated once it has been freed of water by evaporating the organic solvent. There is always some water remaining in the organic layer after aqueous extractions. Adding anhydrous sodium sulfate for drying the organic layer, eliminates this water by creating sodium sulfate hydrate, which is likewise a solid and so easily filtered away.
Solvent evaporation is the process of emulsifying polymer in aqueous phase and dispersing it in a volatile solvent such as dichloromethane, chloroform, or ethyl acetate. The solvent is then evaporated using high heat, vacuum, or continuous stirring. By placing the solution in an open container, solvent evaporation occurs (an Erlenmeyer, evaporating dish, beaker, vial). The solvent is boiled out by placing the container on a heat source (steam bath, hot plate, heating mantle, sand bath).
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