Tep 3: determine the stereochemistry of the precursors. How is stereochemistry of the starting materials affected in the suzuki reaction? select the correct statements. Stereochemistry of the vinyl boronic acid will be retained stereochemistry of the vinyl halide will be inverted. Stereochemistry of the vinyl halide will be retained stereochemistry of the vinyl boronic acid will be inverted

The table is based on the periodic table and is to be filled by finding out various elements of periodic table

Disclaimer:

The table given below is not clear and hence only general idea can be provided

The table is based on the idea of periodic table where various constituents such as mass number, overall charge , total particles, number of protons have been asked to be labelled.

Sodium has been solved as an example and various postulates of Cu is being provided to solve accordingly

In the constituents of element Cu

Name- Cuprous and Cupric

Atomic number-29

Mass number-63

overall charge-+2 for Cuprous and +3 for Cupric

Total particles in nucleus-63

number of protons -29

number of neutrons-34

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Using benzene density, the mass of benzene is 131.805 grams.

We need to know about the density to solve this problem. Density is a unit that measures how dense an object is. Density can be measured by dividing mass by volume. It can be written as

ρ = m / V

where ρ is density, m is mass and V is volume

From the question above, we know that

ρ = 0.8787 g/mL

V = 0.15 L = 150 mL

By substituting the following parameters, we get

ρ = m / V

0.8787 = m / 150

m = 0.8787 . 150

m = 131.805 grams

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The molar mass of camphor in the nearest whole number is 152 g/mol.

Given,

P = 12 torr or 0.01579 atm

1 atm = 760 torr

Density = 0.0829 g/l

R = 0.0821 L.atm/mol.K

T = 273° K + 80° K

T = 353° K

As we know,

PV = nRT

Or, PV = mass × R × T / molar mass

Or, P = mass × R × T / volume × molar mass

Where, mass/ volume = density (d)

P = dRT / molar mass

Now putting the values,

0.01579 = 0.0829 × 0.0821 × 353 / molar mass

Or, molar mass = 152.156 g/mol.

Hence, the molar mass of camphor is 152 g/mol.

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The molecular formula of a molecule that has an empirical formula of ch and its molar mass is known to be 26 g/mol is C₂H₂

The molecular formula of a compound is the total number of atoms present in a molecule of the compound.

The empirical formula of the molecule is the simplest whole number of atoms of a compound.

The empirical formula of the molecule is ch

The molar mass is 26 g/mol

So, the molecular formula will be C₂H₂ and the compound is acetylene. It is a hydrocarbon.

Thus, the molecular formula of the molecule is C₂H₂.

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the mass percent is 45.67%

The mass percentage of a solution is calculated as the solute concentration in grams per 100 g of the solution.

Given that 39.5 g of water dissolves 33.2 g of ammonium carbonate.

∴

Mass of the solution is (33.2+39.5) g = 72.7 g

So, the solution of 72.7 g includes 33.2 g of ammonium carbonate.

So 100 g solution contains

33.2/72.7×100≈45.67 g ammonium carbonate

Thus the mass percentage of the solution is 45.67%

One approach to show the concentration of an element in a compound or component in a combination is as a mass percentage. The mass percentage is computed by dividing the total mass of the combination by the mass of each component and multiplying the result by 100%.

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The scientific questions Claudia can ask about the flame test are (A), (C), and, (D).

The flame test is used to find sure factors, which on heating deliver a particular colour to the flame.

clinical questions are extraordinary from regular questions as they've a prior goal and need to be testable.

a very good scientific question is absolutely reality-primarily based and may be answered through experiment or using previous evidence.

three principal kinds of clinical questions are Verification questions, size, or statement-based totally facts series, which include specific capabilities of an organism or phenomenon.

The clinical questions Claudia ask is-

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The precaution to be taken while measuring the temperature of a liquid in a beaker is applying proper heat balance and taking all the required precautions.

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The molecules in a sample of solid so2 are attracted to each other by a combination of London forces and dipole-dipole interactions.

Other names for London dispersion forces include dispersion forces, London forces, fluctuation induced dipole bonds, instantaneous dipole-induced dipole forces, and weakly van der Waals forces. Since the electrons are often arranged symmetrically with regard to the nucleus, they serve as a form of electrically symmetric force between atoms and molecules.

Dipole-dipole interactions, which result from the close association of induced or permanent dipoles, are weak interactions. Van der Waals interactions are the name given to these forces taken as a whole. These interactions are widespread in proteins and range widely in strength.

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Answer:

matter is substance that has mass.

Answer: Mass and Volume?

Explanation:

The gas must be heated to a final temperature of 137°C in order to fill a volume of 557 ml.

Given,V₁= 371mlV₂ = 557 mlT₁ = 0°C or 273 K

The final gas temperature that has to be heated must be determined.

As long as the cylinder is free to move, the pressure is always 1 atm, or equal to the external pressure.

Consequently, by using Charles Law, we obtain

V₁ / T₁ = V₂ / T₂

where starting and ultimate volumes V1 and V2, respectively T1 and T2 are beginning and ultimate temperatures, respectively (in Kelvin).

The ultimate temperature is as a result

T₂ = V₂ × T₁ / V₁Or, T₂ = 557 x (0+273) / 371Or, T₂ = 410 KOr, T₂ = 137°C.

As a result, the temperature is 137°C at the end.

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There is a significant quantity of energy released during the hydrolysis of the covalent bonds in ATP.

Phosphate-phosphate bond hydrolysis occurs during the breakdown of an ATP molecule, which releases a significant amount of energy.

How is ATP hydrolysis defined?

Adenosine triphosphate (ATP) contains highly energetic phosphoanhydride bonds that, when broken, such as occurs in muscles, release chemical energy through a catabolic reaction process called ATP hydrolysis.Nitrogen-carbon double bonds, phosphate-phosphate bonds, carbon-hydrogen bonds, and hydrogen bonds are all found in an ATP molecule.

Phosphate-phosphate bond hydrolysis occurs during the breakdown of an ATP molecule, which releases a significant amount of energy.

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Bacteria and archaea fix nitrogen (n2) by reducing it to ammonia (nh3), the form of nitrogen assimilated by plants. the main reservoir of nitrogen is is the atmosphere.

The transformation of atmospheric Nitrogen N[tex]_{2}[/tex] into ammonia NH[tex]_{3}[/tex] which is a form that plants may use, is known as biological nitrogen fixation. However, eukaryotes do not engage in the process; it is exclusive to bacteria and archaea.

It has long been recognized that some archaea can contribute to the nitrogen cycling processes (albeit some of these organisms were not initially recognized as archaea). These included both assimilatory and dissimilatory activities, such as the fixing of atmospheric nitrogen. However, rather than large terrestrial or aquatic environments, these reactions were linked to extremophilic archaea that are generally found in 'exotic' habitats like hot springs or salt-saturated lakes.

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The classification of an instrument that makes sound from the substance itself is Idiophones.

Instruments are objects that are used in labs and music classes. They are the main items that help in doing work in those classes and labs. Instruments are made with technical knowledge and help in technical things.

The idiophone is an instrument that produces sound by vibrating the plates of the instrument. Under this, the instrument produces voices by themselves.

Thus, Idiophones are a type of instrument that produces sound using the substance itself.

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Zn, Cd, and Ag are transition metals that usually form only one monoatomic cation.

A monatomic cation is a cation made of only one atom.

Cations are positively charged ions, in this example Ag⁺, Cd²⁺ and Zn²⁺.

These cations form only one type of ion, while iron and copper form more than one type of cations.

Iron and copper form cations with different charges (Fe²⁺, Fe³⁺, Cu⁺, Cu²⁺).

It depends on electron configuration which type would be formed.

Electron configuration of zinc atom: ₃₀Zn 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s²

Transition metals are elements in the d-block of the Periodic table.

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The two effects a soluble impurity usually has on the melting point of a compound are increase or decrease in the melting point of the compound.

The temperature at which a substance transforms from a solid into a liquid is known as its melting point. Melting happens for a pure substance at a single temperature.

The more prevalent soluble contaminants are organic matter, sodium chloride, sodium sulphate, sodium carbonate, magnesium chloride, calcium chloride, calcium sulphate, and calcium bicarbonate.

A solid's melting point is lowered by impurities, which have an impact on it. This occurs because the majority of solids have some sort of crystal lattice structure that is held together by the strong ionic binding forces. Impurities interfere with this lattice structure, weakening the bonds when they are present. Because of the weakened nature of these linkages, the solid will melt at a cooler temperature.

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On calculating using conversions, John can select either the package of wood with (a) 3 pieces of 2000mm each or the one with (d) 6 pieces of 100cm each.

On conversion of units from mm and cm to m:

1m = 100cm

1m = 1000mm

Therefore,

Since John requires 6m of wood to build a diving board, using unit conversions:

3 pieces of 2000mm each:

2000mm = 2m = 2m x 3 = 6m

4 pieces of 1.5 cm each:

1.5cm = 0.015m x 4 = 0.06m

6 pieces of 100 mm each:

100mm = 0.1m x 6 = 0.6m

6 pieces of 100 cm each:

100cm = 1m x 6 = 6m

8 pieces of 200 mm each:

200mm = 0.2m x 8 = 1.6m

Result:

The package with 3 pieces wood of 2000mm each equals to 6m of wood.

Similarly, the package with 6 pieces wood of 100cm each equals to 6m of wood.

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Answer:

29.25g

Explanation:

Number of moles = Mass / Molar mass

Number of moles of NaOH = 20g/(23 + 16 + 1)

= 0.5mol

1 mol of NaOH = 1 mol of NaCl

Therefore, 0.5mol of NaOH = 0.5mol of NaCl

0.5mol = Mass of NaCl / (23 + 35.5)

Mass = 0.5 × 58.5

= 29.25g

I hope this helps! ^^

19 ml of a 5m solution of sodium borate must be added to a 200 ml solution of 50mm boric acid in order for the ph to be 9.6

Here pH=Pka-log[A]/[B]

= 9.6=9.24-log[A]/[B]

= log[A]/[B]=-0.36

Here for ml molarity formula is used

Molarity=mass/volume here mass of sodium borate is 381g/mol and volume of solution is 200ml

mass/volume=381/200=1.905/5.0×50=19ml

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Answer:

Ionic bonds are stronger than covalent bonds

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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When Methane thiol, CH₃SH, reacts with O₂, 25.8 grams of Sulfur dioxide, SO₂ is formed and limiting reactant is Oxygen, O₂.

The balanced chemical reaction is:

CH₃SH(g) + 3 O₂(g) → 2 H₂O(g) + CO₂(g) + SO₂(g)

             Molecular weights:       Actual/given mass:

CH₃SH = 48.11 g/mol                    27.3 g      

O₂         = 32.01 g/mol                    38.6 g  

H₂O      = 18.01 g/mol            

CO₂      = 44.01 g/mol                  

SO₂       = 64.06 g/mol

Number of moles =    Given mass    

                                  Molecular mass

So,

moles of methane thiol = 27.3 ÷ 48.11= 0.56 moles

moles of oxygen = 32.01÷38.6 = 0.82 moles

From the reaction,

1 mole of CH₃SH reacts with 3 moles of O₂  to give 1 mole of SO₂

Thus, 0.56 moles of CH₃SH reacts to form 1 × 0.56 = 0.56 moles of SO₂

Mass of SO₂ produced is 0.56 × 64.06 g = 35.86 g

moles of SO₂ = 35.86 ÷ 64.06 = 0.55 moles

So,

The balanced chemical equation for the standard formation reaction of solid calcium hydroxide CaOH2 is:

                                Ca + O2 + H2  →   Ca(OH)2

The reactant components that are required in the standard states are calcium(Ca), Oxygen(O2), and hydrogen(H2). Oxygen and hydrogen are in their gaseous form and calcium is in solid state.

All of these reactants react to form Ca(OH)2 which is also known as slaked lime.

                           Ca + O2 + H2  →   Ca(OH)2

This chemical equation is balanced because there are 1 Ca, 2 Oxygen atoms and 2 Hydrogen atoms on either sides.

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Answer:

1600 mm to m = 1.6 meters

Explanation:

By ideal gas approximation, the final pressure is 2.14 atm.

We need to know about the ideal gas theory to solve this problem. The ideal gas is assumed that there is no interaction between particles in a gas. It can be determined by the equation

P . V = n . R . T

where P is pressure, V is volume, n is the number of moles gas, R is the ideal gas constant (8.31 J/mol.K) and T is temperature.

From the question above, we know that

V1 = 12.5 L

V2 = 29.3 L

P1 = 5.01 atm

When the initial and final temperature is the same, we can use the ratio of pressure and volume as

P1 . V1 = P2 . V2

5.01 . 12.5 = P2 . 29.3

P2 = 2.14 atm

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The 12-hour time of contact between alginate and therefore the plaster cast is not recommended because it influences the quality of the plaster cast

Gypsum may be a resource that is found by doing a variety of activities. Gypsum are often crafted into Gypsum Orbs, which may then be turned into special caches is called Gypsum Casts. Gypsum Casts are gear type specific, and when opened, guarantee an Expertise bump for that sort of gear as well as an item of that type.

Gypsum products are one among the most broadly utilized dental materials for fabrication of dental casts and dies which are used as for further construction of indirect dental restorations

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Answer:

60 N.

Explanation:

The force formula of acting on an object is F=ma.

This means that...

F= force

M - mass

A = acceleration

So to solve this you have to solve for F.

F=ma

F=(20kg)(3m/s^2)

F= 60 N.

I hope this helps, have a good day! :D

The observation most likely indicates that only a chemical change has taken place the change cannot be reversed.

What is a Chemical change?

Hence, The observation indicates chemical change is the change that cannot be reversed.

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Answer:

a diagram of hydrogen has 1 proton with charge (+1) inside it's nucleus and no neutrons

also it has 1 electron with charge (-1) outside the nucleus in orbit

Explanation:

a. 55.0 g of ti = 0.02 moles

b. 16.9 mg of na = 0.62 moles

c.  7.95 x 1024 ne atoms = 0.4 moles

d. 25 xe atoms = 0.0037 moles

In chemistry, the term "mole" (sometimes written "mole") refers to a standard scientific unit for measuring vast amounts of extremely small objects like atoms, molecules, or other specific particles.

The mole represents 6.02214076 × 10^23 units, an astronomically huge number. With effect from May 20, 2019, the International System of Units (SI) adopted this number as the mole definition by the General Conference on Weights and Measures.

The number of atoms found in 12 grams of carbon-12, as established scientifically, made up the definition of the mole in the past. The quantity of units in a mole is also known as Avogadro's number or Avogadro's constant in honor of the Italian physicist Amedeo Avogadro (1776–1856).

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