skateboarder left at 3:40 pm. The skateboarder arrived at 4:55 pm. How much time did
it take for him to get there?

Triphenyl stereochemistry.  methanol is the product of the Grignard reaction between methyl benzoate and excess phenylmagnesium bromide.

We will have a reduction reaction in this case. We progress from an ester group to an alcohol group. The first step is to transfer a hydride from the LiAlH4 group to the carbonyl group. The ethyl group then separates to form ethanol and an aldehyde, which continues to react with more LiAlH4. In this case, another hydride is transferred to the carbonyl group, resulting in the formation of alcohol. (See Fig.)

Triphenyl methanol is the stereochemistry product of the Grignard reaction between methyl benzoate and excess phenylmagnesium bromide.

As the carbonyl moiety is attacked, the reaction proceeds via nucleophillic reaction. There is the formation of a tetrahedral intermediate. The attack of the first molecule of PhMgBr is accompanied by the loss of the -OMe group.

Trimethyl phenoxide is produced by the attack of a second PhMgBr molecule. Protonation

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B. They are vibrating slightly

Explanation:

This is because the particles are really close together and they vibrate on the spot.

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The sum of all an object's atoms and molecules' energies makes up the substance's total energy.

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Answer:

Hamburger

Explanation:

Answer:

Stoichiometry is a collective term for the quantitative relationships between the masses, the numbers of moles, and the numbers of particles (atoms, molecules, and ions) of the reactants and the products in a balanced chemical equation. I think.

Answer: Stoichiometry is a collective term for the quantitative relationships between the masses, the numbers of moles, and the numbers of particles (atoms, molecules, and ions) of the reactants and the products in a balanced chemical equation.

Explanation:

Stoichiometric Calculations are mostly based on chemical formulas. Formula Mass: It is defined as the sum of the atomic weights of each atom present in the molecule of the substance. For example formula mass of Na2S is calculated as 2(23) + 1(32) = 78.

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Answer: Unknown

Explanation:

In order to solve the question you would require the approximate amount of gravity upon the diver, meaning his acceleration due to gravity.

Answer:

3

Explanation:

102 are significant figures

Answer:

3 digits

Explanation:

The first nonzero digit is counted as a significant digit and the zero inbetween 2 nonzero digits count too.

Therefore, the significant digits are 0.00102.

Answer:

T2 =21.52°C

Explanation:

Given data:

Specific heat capacity of sample = 1.1 J/g.°C

Mass of sample = 385 g

Initial temperature = 19.5°C

Heat absorbed = 885 J

Solution:

Formula:

Q = m.c. ΔT

Q = amount of heat absorbed or released

m = mass of given substance

c = specific heat capacity of substance

ΔT = change in temperature

ΔT = Final temperature - initial temperature

885J = 385 g× 1.1 J/g.°C×(T2 - 19.5°C )

885 J = 423.5 J/°C× (T2 - 19.5°C )

885 J / 423.5 J/°C = (T2 - 19.5°C )

2.02°C = (T2 - 19.5°C )

T2 = 2.02°C + 19.5°C

T2 =21.52°C

Latitude affect climate because the closer to the equator, the warmer it gets. The correct answer is B.

The temperature rises as one goes nearer to the equator. One of the key elements that influences climate is latitude. The amount of solar radiation received per unit area rises as you get towards the equator. This raises the temperature and increases evaporation, which causes an increase in precipitation. As a result, the equator's vicinity is typically characterized by a tropical or subtropical climate, marked by warm temperatures and high humidity.

The amount of solar energy received per unit area drops as you move further from the equator, resulting in colder temperatures and less evaporation, which in turn causes less precipitation. As a result, the climate is often colder, with lower temperatures and less humidity, in regions close to the poles.

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Therefore the pressure if the volume is increased to 4.12L the pressure is

P₂=0.636atm

Helium is a chemical element with the atomic number 2 and the letter He. It is a colourless, odourless, tasteless, non-toxic, inert, monatomic gas and the first member of the noble gas group in the periodic chartIt has the lowest melting and boiling points of all the elements.

Since helium is a safe, non-flammable gas, it is frequently used to inflate balloons for festivities and parades. On the other hand, helium is a crucial component in several sectors, including high-tech manufacturing, medical technology, space exploration, and national security.

The second most prevalent element in the universe, helium, is scarce on Earth. It is the lightest noble gas, colourless, odourless, inert, and has a low boiling point. It is a byproduct of nuclear fusion and radioactive decay.

According to Boyle's Law:

P₁ V₁=P₂ V₂

P₁=1.61atm

V₁=2.26L

V₂=4.12L

P₂=(P₁ V₁)/V₂

P₂=((1.61atm)(2.26L))/4.12L

P₂=0.636atm

Boyle's Law states that the volume of a given quantity of gas at a constant temperature is inversely proportional to its pressure, so this makes sense. The pressure must decrease proportionally as the volume rises.

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Answer:4.5 Grams

Explanation:

In 1 mole :- 18gm H2O present as it is it's molar mass

∴ In 0.25 mole=0.25×18

                                             = 4.5gm

The mechanism for the cyclic aldol reaction of 7-Cyclopentyl-6-oxoheptanal in the presence of base involves multiple steps.


1. The base (usually hydroxide) deprotonates the alpha carbon of the aldehyde group, creating a nucleophilic enolate ion.
2. The enolate ion attacks the carbonyl carbon of the aldehyde on the adjacent carbon, forming a new carbon-carbon bond and an oxyanion intermediate.
3. The oxyanion intermediate is protonated by water or another proton source to form the aldol product.

The complete mechanism for the reaction is shown below:

The cyclic aldol reaction of 7-Cyclopentyl-6-oxoheptanal in the presence of base involves the deprotonation of the alpha carbon by the base, followed by an attack of the resulting enolate ion on the carbonyl carbon of the aldehyde group. The reaction results in the formation of a new carbon-carbon bond and an oxyanion intermediate, which is subsequently protonated to form the aldol product.

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Answer:

0.00944

Explanation:

Xenon mass number on the periodic table: 131.29

Oxygen mass number: 16.00

Add them to find the molar mass of xenon trioxide: 131.29+3(16) = 179.29g/mol

Convert this to moles

\(1.69g * \frac{mol}{179.29g} = 0.00944mol\)

In order to maintain the accuracy of results , the tool which  is most useful for measuring 12 milliliters of saltwater is graduated pipette.

Accuracy in terms of chemistry can be defined as to how close a measurement is to the true value.There are three types of accuracy:

1) Point accuracy-It means accuracy is present at that point of scale only.It does not give any information about the accuracy of the instrument.

2)Percentage of true value--It is the accuracy  which is determined by identifying accuracy of the instrument  and comparing it with the measured true value.

3)Percentage of scale range- It is the accuracy  which determines accuracy of the measurement.

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Answer:

Gaseous at room temperature

Explanation:

HCl at room temperature, a colorless gas, which forms white hydrochloric acid vapor, reacts with atmospheric water vapor. Hydrogen chloride gas and hydrochloric acid are important technologies and industry. Hydrochloric acid, an aqueous solution of hydrogen chloride, is also commonly given the formula HCl.

a. Addition of CaCO₃ favors the formation of products.

b. Addition of Na₂CO₃ favors the formation of products.

c. Addition of HCl favors the formation of reactants.

d. Addition of NaOH favors the formation of products.

To determine whether the given actions would favor the formation of products, reactants, or have no effect on the dissolution of calcium hydroxide, we need to consider the chemical reactions involved.

The chemical equation for the dissolution of calcium hydroxide in water is:

Ca(OH)₂ (s)  ⇄Ca²⁺ (aq) + 2OH⁻ (aq)

a. Adding calcium carbonate (CaCO₃) to an equilibrium combination of calcium hydroxide and water would promote the development of products. This is due to the fact that CaCO₃ can form carbon dioxide and calcium hydroxide when it reacts with water. Calcium hydroxide would dissolve more quickly as a result of the equilibrium shifting in favor of the products due to the higher concentration of Ca(OH)₂ on the product side.

b. Adding sodium carbonate (Na₂CO₃) to an equilibrium combination of calcium hydroxide and water would encourage the development of products. Calcium carbonate (CaCO₃) and sodium hydroxide (NaOH) are created when sodium carbonate interacts with calcium hydroxide. Due to the removal of Ca²⁺ and OH⁻ ions during the production of CaCO₃, the equilibrium would change in favor of the products to restore the balance.

c.Adding HCl (hydrochloric acid) to an equilibrium combination of calcium hydroxide and water would encourage the synthesis of reactants. Strong acid HCl can react with the strong base calcium hydroxide to produce calcium chloride (CaCl₂) and water. Ca²⁺ and OH⁻ ions are consumed in this reaction, which lowers their concentration and tips the equilibrium in favor of the reactants.

d. Adding sodium hydroxide (NaOH) to an equilibrium combination of calcium hydroxide and water would encourage the production of products. Strong base sodium hydroxide can combine with calcium chloride to produce calcium hydroxide and sodium chloride. Ca²⁺ and OH⁻ ions are replenished throughout this reaction, raising their concentrations and altering the equilibrium in favor of the products.

In summary:

a. Addition of CaCO₃ favors the formation of products.

b. Addition of Na₂CO₃ favors the formation of products.

c. Addition of HCl favors the formation of reactants.

d. Addition of NaOH favors the formation of products.

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--The question is incomplete, the complete question is given below:

" Identify whether the following actions would favor the formation of products, reactants, or have no affect upon the dissolution of calcium hydroxide. Explain each answer.

a. Addition of CaCO₃ to an equilibrium mixture of calcium hydroxide and water.

b. Addition of Na₂CO₃ to an equilibrium mixture of calcium hydroxide and water.

c. Addition of HCl to an equilibrium mixture of calcium hydroxide and water.

d. Addition of NaOH to an equilibrium mixture of calcium hydroxide and water."--

The following reactions of alkenes is not stereospecific is C. acid-catalyzed hydration reaction (H₂O/H₂SO₄)

Stereospecific reactions occur when the stereochemistry of the reactant is retained in the product. These types of reactions are distinguished by the use of double-headed arrows in reaction mechanisms to demonstrate the conservation of stereochemistry. The following reactions of alkenes stereospecific are hydrogenation (H₂/P₁), bromination (Br₂ in CH₂Cl₂), bromohydrin formation (Br₂/H₂O).

The acid-catalyzed hydration reaction (H₂O/H₂SO₄) of alkenes is not stereospecific because the H and OH atoms can be added to either face of the alkene's double bond. When the reaction occurs, an intermediate carbocation is formed, which is planar. This carbocation can either be attacked by the nucleophile from above or below, resulting in the formation of an equal amount of stereoisomers. Therefore, the correct answer is C. acid-catalyzed hydration reaction (H₂O/H₂SO₄) is not stereospecific.

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Quantum mechanics is the study of atoms and incredibly tiny particles that are even smaller.

In quantum mechanics, another branch of physics, atomic and subatomic particles are investigated. The primary field of science that deals with the study of atoms and molecules is chemistry. By utilizing their knowledge of atoms, chemists create molecules that resemble drugs. A distinction is established between atomic physics, which studies the atom as a system made up of a nucleus and electrons, and nuclear physics, which explores nuclear reactions and special properties of atomic nuclei. Three subatomic particles make up matter: protons, neutrons, and electrons. The only subatomic particles that have electrical charges are protons and electrons, with protons having a positive charge and electrons having a negative charge.

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Answer:

I believe it 3

BaSO₄ is safe to ingest because of its low solubility in water and limited release of Ba²⁺ ions. The sparing solubility of BaSO₄ ensures that only a minimal amount of Ba²⁺ ions are present, reducing the risk of toxicity. This property makes BaSO₄ an effective and safe contrast agent for obtaining X-ray images of the gastrointestinal tract.

BaSO₄ (barium sulfate) is safe to ingest because it has very low solubility in water, meaning it does not readily dissolve into Ba²⁺ ions in the gastrointestinal tract. This property is crucial for its use in medicine to obtain X-ray images of the gastrointestinal tract.

When BaSO₄ is ingested, it remains mostly undissolved as a solid in the gastrointestinal tract. Only a small fraction of BaSO₄ will dissolve, leading to the release of a negligible amount of Ba²⁺ ions into the surrounding solution. The concentration of Ba²⁺ ions in the gastrointestinal tract remains extremely low due to the limited solubility of BaSO₄.

The toxicity of barium arises primarily from the presence of Ba²⁺ ions in the body, which can interfere with various physiological processes. However, since BaSO₄ does not readily dissociate into Ba²⁺ ions, the amount of toxic Ba²⁺ ions released into the body from ingested BaSO₄ is extremely minimal. As a result, the risk of toxicity or harm from ingesting BaSO₄ is negligible.

The principle that governs the limited solubility of BaSO₄ is the common ion effect. The common ion effect states that the solubility of a sparingly soluble salt is decreased in the presence of a common ion, which in this case is the Ba²⁺ ion. When BaSO₄ is ingested, the presence of Ba²⁺ ions already in the body (such as from dissolved barium salts) further decreases the solubility of BaSO₄, making it even less likely to dissolve and release toxic Ba²⁺ ions.

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Answer:

Protons= 11

neutrons= 12

electrons = 10

Explanantion:

Look for Na on periodic table

Atomic Number = 11

Atomic Mass = 23 (round it to be an integer)

Number of protons = Atomic number = 11

Number of neutrons = Atomic mass - atomic number = 23-11 =12

Number of electrons = 11 - e = ´+1 , electrons = 10

Answer:

Protons= 11

neutrons= 12

electrons = 10

Explanation:

That should be the answer :)

The probability that a person has tuberculosis given a negative DNA indication is approximately 0.0005 or 0.05%.

To find the probability that a person has tuberculosis given a negative DNA indication, we can use Bayes' theorem. Bayes' theorem states that the probability of an event A given event B can be calculated using the formula: P(A|B) = (P(B|A) * P(A)) / P(B)

In this case, we want to find P(T|N), the probability of having tuberculosis given a negative DNA indication.

We are given the following information:

P(T) = Probability of having tuberculosis = 0.01 (given)

P(N) = Probability of a negative DNA indication (to be calculated)

To calculate P(N), we can use the complement rule:

P(N) = 1 - P(T) = 1 - 0.01 = 0.99

Now, we can plug the values into Bayes' theorem:

P(T|N) = (P(N|T) * P(T)) / P(N)

P(T|N) = (0.05 * 0.01) / 0.99

P(T|N) ≈ 0.0005

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The work done is zero because the wall does not move.

When you push against a wall and it doesn't move, no work is done in the scientific sense.

In physics, work is defined as the force applied to an object multiplied by the distance over which the force is exerted.

In this scenario, although you may have expended energy and made an effort, the wall does not undergo any displacement. Since the displacement is zero, the work done on the wall is also zero.

Work requires both force and displacement in the direction of the force, and since the wall remains stationary, no work is accomplished.

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Answer:

Alcohol, 0.63 I don't know the rest the rest

Explanation:

Answer:

Explanation:

1. Alcohol

2. Marker 1

3. Purple

4. Marker 2

Filling out the lab paper gives you the answers. These were all correct.

Answer:

dic

Explanation:

The mass, in grams, of H₂O is produced in the decomposition of ammonium nitrate is 72.06 grams.

Mass of any substance will be calculated by using their moles as:

n = W/M, where

W = required mass

M = molar mass

Given chemical reaction is:

NH₄NO₃ → N₂O + 2H₂O

Moles of 160.1 g of NH₄NO₃ = 160.1g / 80.03g/mol = 2moles

From the stoichiometry of the reaction, it is clear that:

1 moles of NH₄NO₃ = produce 2 moles of H₂O

2 moles of NH₄NO₃ = produce 2×2=4 moles of H₂O

Mass of H₂O will be calculated as:

W = (4mol)(18.01 g/mol) = 72.04 grams (72.06 approx)

Hence, option (4) is correct.

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Heat is evolved during exothermic reactions. An exothermic reaction is a chemical reaction that produces energy in the form of heat, light, or sound. This means that heat is released into the environment during an exothermic reaction.

In these types of reactions, the reactants' energy is greater than the products'. Because the reaction loses energy, it is exothermic.The most well-known example of an exothermic reaction is a combustion reaction. When you light a match, for example, the heat from the reaction of the match and the oxygen in the air is exothermic.

This produces a flame and gives off heat and light. Other examples include chemical reactions in hand warmers, fireworks, and fuel cells.Exothermic reactions have a negative delta H (ΔH), indicating that energy is released during the reaction. The total energy difference between reactants and products in an exothermic reaction is referred to as the enthalpy change.

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