use your knowledge of aromatic reactivity to complete the following for each compound: i. draw all reasonable resonance structures for the carbocation formed by para attack of the electrophile no 2 . ii. label any resonance structures that are especially stable or especially unstable. iii. draw the expected product(s) of the reaction of the compound with hno 3 in h 2 so 4

The element Mendelevium has 157 neutrons in its nucleus and is named after Dmitri Mendeleev who made the first periodic table.

Mendelevium can be described as a synthetic element with the chemical symbol Md and atomic number 101. It is placed as a metallic radioactive transuranium element in the actinide series.  This element is the first element by an atomic number that currently cannot be generated in macroscopic amounts by neutron bombardment of lighter elements.

The atomic mass of this element is 258 so it has 157 neutrons in its nucleus. The most stable is Md -258 with a half-life of 51 days, however, the shorter-lived Md-256 (half-life of 1.17 hours).

Mendelevium was discovered by bombarding alpha particles in 1955 and was named after Dmitri Mendeleev, father of the periodic table of chemical elements.

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Answer:

1. Crush the sugar into powder.

2. Heat the water.

3. Dissolve it by stirring continuously

Explanation:

1. Crushing the sugar into powder increases surface area. So it increases the changes of dissolving

2. Heating the water increases the capacity of water to dissolve sugar.

3. Stirring continuously increases randomness of particles so eases mixing up thus increasing dissolving tendency.

A chemical change is when a substance undergoes a chemical reaction and becomes something new.

A change in the physical attributes like colour, texture, smell, or others serves as proof of this. The reactants that started a chemical reaction are frequently different from the outcomes of the reaction.

The creation of chemical bonds is indicated by the blank space in this question. Covalent bonds, which are compounds that share electrons, are created when two or more atoms share electrons.

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Answer:

hey :)

your answer is D.

Explanation:

To find density, you must divide mass and volume.

8 divided by 4 is 2

6 divided by 6 is 0

4 divided by 2 is 2

hope i helped any :))

The speed at which sound waves travel in a medium depends upon the density and compressibility of the medium. Density refers to how closely packed the particles of a substance are, while compressibility refers to how easily the substance can be compressed or squeezed.

In general, the denser and less compressible a substance is, the faster sound waves will travel through it. This is why sound travels faster through solids than through liquids or gases, as solids are generally denser and less compressible than liquids or gases. Additionally, the temperature of the medium can also affect the speed of sound waves, as warmer substances tend to have faster-moving particles that can transmit sound more quickly.

The speed at which sound waves travel in a medium depends upon the density and compressibility of the medium.
To reiterate, the two factors affecting the speed of sound waves are:
1. Density of the medium
2. Compressibility of the medium

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Answer:

a group of electrochemical cells that can be recharged

Atoms transfer or share electrons to obtain octet (option C).

Octet rule in chemistry refers to a rule stating that atoms lose, gain, or share electrons in order to have a full valence shell of 8 electrons.

Hydrogen is excluded from this rule because it can hold a maximum of 2 electrons in its valence shell.

During chemical reactions, atoms of elements combine with other atoms and lose, gain or share their electrons so as to obtain this octet state of electrons.

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Answer:

Explanation:

The sketch of the curve for two Br atoms can be seen in the image attached below. From the image below, we can deduce the following:

On the periodic table, the Bromine (Br) atom is the fourth member in the halogen family group. The atomic size increases from top to bottom down the group, thus Br atom posses a larger atomic size than Cl atom. As a result of that, the bond length formation between the two Br atoms will be larger compared to that of the two Cl atoms.

Answer:

The reason is carbon's ability to form stable bonds with many elements, including itself. 

Explanation:

This property allows carbon to form a huge variety of very large and complex molecules. In fact, there are nearly 10 million carbon-based compounds in living things!

Answer:

Explanation:

The reason is that carbon is able to form stable bonds with many elements, including itself, which allows carbon to form a huge variety of very large and complex molecules.

To determine the total change in enthalpy of a reaction, we need to examine the enthalpy values of the reactants and products and consider their stoichiometric coefficients. Without specific information about the reaction, it is not possible to provide an exact answer from the given options (A, B, C, or D). The total change in enthalpy depends on the specific reaction and the enthalpy values associated with it.

The total change in enthalpy of a reaction, denoted as ΔH, is influenced by the enthalpy values of the reactants and products. It is calculated by subtracting the sum of the enthalpy values of the reactants from the sum of the enthalpy values of the products, considering their stoichiometric coefficients.

However, without specific information about the reaction or enthalpy values associated with it, it is not possible to determine the total change in enthalpy from the given options (A, B, C, or D). The values provided (25 kJ, 30 kJ, 35 kJ, and 55 kJ) are arbitrary and do not correspond to a specific reaction.

To accurately determine the total change in enthalpy, the specific reaction and corresponding enthalpy values need to be provided.

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The Lewis structure of AsO showing 2 lone pairs is as follows:

O

As

/

X X (where X represents a lone pair)

The molecular geometry of AsO is trigonal planar. The central As atom is hybridized with sp2 hybridization. The approximate bond angles in AsO are 120 degrees. The AsO ion is polar.

A Lewis structure, also known as a Lewis dot diagram, is a way to represent the chemical bonding in a molecule. It uses dots (also called electron dots or Lewis dots) to show the valence electrons on an atom, and lines to show the bonds between atoms. The goal of drawing a Lewis structure is to use the valence electrons of the atoms in a molecule to form the most stable arrangement of atoms, that is to say, to achieve the octet rule where each atom has 8 valence electrons in its outermost shell.

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At standard temperature, pressure, or STP the volume of 1.00 mole of carbon dioxide is 22.4 L. Option D is the correct answer

According to the Ideal Gas Law,

PV = nRT,

Where :

P = Pressure

V = volume

n = number of moles

R = gas constant

T = temperature in Kelvin.

The volume of one mole of that substance is known as the molar volume. The volume is known as the molar volume of an ideal gas at STP.

At STP (standard temperature and pressure),

P = 1 atm

T = 273 K

R = 0.08206 L atm \(mol^-1 K^-1.\)

n = 1.00

Substuting the values in the Ideal Gas Law equation we get:

PV = nRT

V= n R T / P

V = 1.00 ×  0.08206 ×  273 / 1

V = 22.4 l

Therefore, the molar volume of 1.00 mole of carbon dioxide at STP is 22.4 L.

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Answer:

C

Explanation:

Answer:

Explanation:

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The energy in Ha for the second excited state of hydrogen (h[0,0,1]) is -1.51 Ha.

To calculate the energy of hydrogen in its second excited state, we need to use the formula for the energy of a hydrogen atom:

E = -13.6 ha / n^2

Where E is the energy in hartrees (ha), and n is the principal quantum number. In this case, n = 3, so we can plug that into the formula:

E = -13.6 ha / 3^2

E = -13.6 ha / 9

E = -1.51 ha

Therefore, the answer is E = -1.51 Ha.

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Since water has a high specific heat, that results in water being able to store/require more energy in order to change it’s temperature. Since San Francisco is so close to water, that would mean that it’s temperature should vary less since water would be able to keep the temperature around the same value even if there was an increase or decrease in thermal energy.  

Answer:

He was the first scientist to observe and describe bacteria and protozoa by looking at a drop of water from a pound under a microscope. He also was the one to build the first compound microscope.

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Answer:

When baking soda is mixed with vinegar, something new is formed. The mixture quickly foams up with carbon dioxide gas. If enough vinegar is used, all of the baking soda can be made to react and disappear into the vinegar solution.

Explanation:

So, the molar mass of tetraethyl lead is

\(207.2+8(12.011)+20(1.00794)=\boxed{323.4468 \text{ g/mol}}\)

Answer:

during compression, the volume (V) of a gas decreases. When this happens, the pressure (P) of the gas increases if the number of moles (n) of gas remains constant. If you keep the pressure constant, reducing the temperature (T) also causes the gas to compress.

Explanation:

If a gas in a balloon occupies 2.25 L at 298 K and 300 kPa, the temperature at which the balloon expand to 3.50L and 2.17 atm is 345.23K.

The temperature of an ideal gas can be calculated using the following formula:

P1V1/T1 = P2V2/T2

Where;

According to the information given in this question;

2.96 × 2.25/298 = 2.17 × 3.5/T2

0.022T2 = 7.595

T2 = 7.595 ÷ 0.022

T2 = 345.23K

Therefore, if a gas in a balloon occupies 2.25 L at 298 K and 300 kPa. the temperature at which the balloon expand to 3.50L and 2.17 atm is 345.23K.

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The direction of energy flow in simple food chain is always sun=> plants( producers)=> primary consumers=> secondary consumers=> tertiary consumers, than finally after death of an organism, to decomposers

The direction of energy flow in simple food chain is always sun=> plants( producers)=> primary consumers=> secondary consumers=> tertiary consumers.

The sequence of events within an ecosystem known as a "food chain" occurs when one live organism eats a different organism, which is then eaten by a larger organism. A food chain is created by the transfer of energy as well as nutrients from one creature to another at various trophic levels. A food web is comprised of numerous linked food chains.

The feeding habits or connections between living things are also explained by the food chain. Trophic level is the term used to describe the orderly phases in a food chain, from producers from the bottom through primary, secondary, and tertiary consumers. A trophic level is any position along a food chain.  A food web and a food chain are similar, but a food web seems far bigger. The direction of energy flow in simple food chain is always sun=> plants( producers)=> primary consumers=> secondary consumers=> tertiary consumers.

Therefore, the direction of energy flow in simple food chain is always sun=> plants( producers)=> primary consumers=> secondary consumers=> tertiary consumers.

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Answer:

2.016E24 same as 2.016 × 10^24

Explanation:

we have to use 2 conversion facts

22.4 and 6.02E23

1. Convert to moles of NH3 from liters of NH3

75.0 ÷ 22.4 = 3.348 moles of NH3

2. Convert to molecules of NH3 from moles of NH3

3.348 × 6.02E23 = 2.016E24 molecules of NH3

please let me know if i need to further eloborate :)

Answer:

Based on the given options, the correct answer for the first question is OB) Benzene protons for I show up between 6.5-7.5 ppm and II between 7.5 - 8.5 ppm. This is because in compound I, the benzene protons exhibit a chemical shift between 6.5-7.5 ppm, while in compound II, the benzene protons show a chemical shift between 7.5-8.5 ppm. This difference in chemical shifts can be used to distinguish between these two compounds using H NMR spectroscopy.

For the second question, based on the reaction scheme provided, it appears to be an electrophilic aromatic substitution reaction where a bromine atom is being substituted with a nucleophile. The correct product would be OD) Br o O Br Br OCH3 OCH3 OCH3, where the bromine atom is replaced by a methoxy (OCH3) group, resulting in the formation of the product with three methoxy groups attached to the benzene ring.

Explanation:

Answer:

9429.9

Explanation:

periodt

i think it is D i hope this helps yall

In his sermon, John Winthrop uses two biblical examples: the concept of a "City upon a Hill" and the principle of mutual care and love. These examples serve to support and explain his ideas about the Puritan colonists' mission and the importance of unity and compassion within their community.

John Winthrop's use of biblical examples in his sermon helps to illustrate and reinforce his ideas in a concise and relatable manner. The phrase "City upon a Hill" represents the Puritan colonists' goal of creating a model society that would serve as a shining example for others to follow. This metaphor highlights their mission to establish a virtuous and righteous community, emphasizing their collective responsibility to uphold moral standards and serve as a beacon of light. The reference to the principle of mutual care and love draws from the teachings of the Apostle Paul in the New Testament. By emphasizing the unity and interdependence of the members of the community, Winthrop highlights the importance of compassion, empathy, and support among individuals. This principle promotes a sense of communal harmony and encourages the Puritans to take care of one another, recognizing that they are part of a larger body working towards a common purpose. Overall, these two biblical examples succinctly convey Winthrop's message about the Puritans' mission and the values they should uphold. They provide a moral framework and inspire the colonists to strive for righteousness, unity, and mutual care within their community.

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A systemic release of histamine and other inflammatory mediators leads to the most dramatic immediate hypersensitivity reaction known as anaphylaxis.

Anaphylaxis is a severe, potentially life-threatening allergic reaction that can occur within seconds or minutes of exposure to an allergen. It is characterized by symptoms such as difficulty breathing, swelling of the throat and tongue, rapid pulse, and loss of consciousness. Anaphylaxis requires immediate medical treatment, including an injection of epinephrine and a trip to the emergency room. If left untreated, anaphylaxis can be fatal.

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Answer:

heterogeneous : A mixture that consists of visibly different substances or phases.

homogeneous : A mixture that has the same uniform appearance and composition throughout its mass.

compound: A pure chemical substance consisting of two or more different chemical elements.

element: A substance consisting one type of atom.