use resonance structures to help you identify all sites of high electron density in the following compound

Elements in order of increasing electronegativity are-

The propensity of an atom to draw electrons into a molecule is known as electronegativity.

Thus, the elements in order of increasing electronegativity are-

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The solutes in an aqueous solution of KF in order of increasing concentration are : Lowest concentration: K+ (aq),H+ (aq),OH- (aq),F- (aq),Highest concentration: HF (aq)

In an aqueous solution of KF, K+ ions come from the dissociation of KF, but KF is a strong electrolyte and dissociates almost completely, so the concentration of K+ ions is relatively high. H+ ions are present in water due to the self-ionization of water, but their concentration is relatively low. OH- ions are also present due to the self-ionization of water, but their concentration is lower than that of H+ ions. F- ions come from the dissociation of KF, so their concentration is higher than that of OH- ions. HF is a weak acid that partially dissociates in water, resulting in a higher concentration of HF compared to the other ions in the solution.

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Answer:

b

Explanation:

The cell notation is defined as the representation of the oxidation-reduction reactions happening in the cells with the help of anode, cathode, and salt bridges. The cell notation format is given below: anode | anode solution || cathode solution | cathode where:anode:

The electrode where oxidation occurs-cathode: The electrode where reduction occurs anode solution: The solution which is in contact with anode-cathode solution: The solution which is in contact with cathode salt bridge: It is used to complete the circuit by allowing the movement of ions between two solutions.The proper line notation for the given reaction is, Cd(s) | Cd²⁺(aq) || Ag⁺(aq) | Ag(s)

The given equation is a galvanic cell, and the line notation follows the anode | anode solution || cathode solution | cathode. Here, the Cd is the anode, and Ag is the cathode. Ag⁺ ion is reduced to Ag and Cd is oxidized to Cd²⁺. The cell diagram has salt bridges. Thus, the correct cell notation is shown below:anode: Cd(s) | Cd²⁺(aq)cathode: Ag⁺(aq) | Ag(s)overall reaction: Cd(s) + 2Ag⁺(aq) → Cd²⁺(aq) + 2Ag(s)E°cell = 1.20 V

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How many moles of tungsten atoms are in 4.8 * 10^25 atoms of tungsten?

Avogadro's number is the number of particles that we have in one mol of particles. It is 6.022 *10^23. For example: in 1 mol of atoms there are 6.022*10^23 atoms.

It's like a dozen. When we say a dozen atoms, we mean 12 atoms. So, when we say a mol of tungsten atoms, we mean 6.022 *10^23 atoms of tungsten.

1 mol of atoms of tungsten = 6.022 *10^23 atoms of tungsten

We will use that relationship to find the number of moles of tungsten atoms that we have in 4.8 *10^25 atoms of tungsten.

number of moles of tungsten atoms = 4.8 *10^25 atoms * 1 mol of atoms/(6.022 *10^23 atoms)

number of moles of tungsten atoms = 79.7 moles = 8 *10^1 moles

number of moles of tunsten atoms = 8.10^1 moles

Answer: b) 8*10¹ moles

Answer:

A. dust

Explanation:

Answer:

Silver was discovered in Greece

Answer:

En 1516 Juan Díaz de Solís descubrió en Sudamérica el mar Dulce que posteriormente Sebastián Caboto denominó Río de la Plata, creyendo que allí abundaba el precioso metal, y de donde tomará el nombre la Argentina.

Explanation:

The name of the compound is (Z)-4,5-dimethyl-4-hepten-1-ol.

It contains a double bond (hence the "en" ending) between the 4th and 5th carbons from the end, and a hydroxyl group (-OH) attached to the 1st carbon.

The "dimethyl" prefix indicates that there are two methyl groups (-CH3) attached to the 4th carbon,

The "hepten" prefix indicates that there are seven carbons in the molecule with a double bond between the 4th and 5th carbons.

The "ol" ending indicates that it is an alcohol with the hydroxyl group attached to the 1st carbon.

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The name of the compound, H₂O is dihydrogen monoxide. Therefore, option A is correct.

The term compound is defined as a substance made from two or more different elements that have been chemically joined. Table salt (NaCl), which is made from the elements sodium and chloride, are two examples of compounds.

Water (H₂O), which is made from the elements hydrogen and oxygen, and it has two hydrogen atom and one oxygen atom so, it is called as dihydrogen monoxide.

Thus, option A is correct.

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Answer:

Deben ser de igual número.

Explanation:

Cap and trade is a system for controlling carbon emissions by allowing companies to trade.

We know that the major issue that faces the planet is the matter of carbon emissions that affect the ecosystem. This carbon emission has caused a steady rise in the temperature of the earth and this is called global warming.

The following is the matching of the terms as shown below;

Cap and trade - A system for controlling carbon emissions by allowing companies to trade

Carbon neutrality - A state of net-zero carbon dioxide emissions

Carbon credit - A permit that allows a certain amount of carbon emissions

Carbon offset - A reduction in greenhouse gas emissions as they are made elsewhere

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Answer:

C2H5NO2

Explanation:

Glycine | C2H5NO2 - PubChem.

weight of glycine= 75.07 g/mol

Answer:

the most common oxidation no.of manganese is + 2 + 3 + 4 + 6 + 7

Explanation:

The mass percent of acetic acid in vinegar can be calculated by dividing the mass of acetic acid by the total mass of the vinegar solution and multiplying by 100.

To calculate the mass percent of acetic acid in vinegar, you need to determine the mass of acetic acid and the total mass of the vinegar solution. Here are the steps to follow:

1. Obtain the molar mass of acetic acid (CH3COOH), which is approximately 60.05 g/mol.

2. Measure the mass of vinegar used in the calculation.

3. Prepare a known volume of vinegar solution and record the mass of the solution using an analytical balance.

4. Determine the mass of acetic acid in the solution by subtracting the mass of the empty container from the mass of the container with the vinegar solution.

5. Calculate the mass percent of acetic acid by dividing the mass of acetic acid by the total mass of the vinegar solution and multiplying by 100:

  Mass percent of acetic acid = (mass of acetic acid / total mass of vinegar solution) x 100

The resulting value will give you the mass percent of acetic acid in the vinegar solution. It represents the percentage of acetic acid by mass in the total solution.

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d. 84% is the percent composition of Carbon, in, C₇H₁₆

% composition is quite straightforward. You can determine by mass how much of each element is contained in a compound using its percent composition. A chemical compound is created when two or more components are combined.

The hydrocarbon includes 80% carbon, which translates to 80% of the molar mass being made up of carbon. Consequently, the hydrocarbon has four carbon atoms.

The percent composition is calculated by multiplying the total mass or quantity of an element present in a molecule or compound by the molecular mass of the compound.

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The ratio for [C\(_5\)H\(_5\)N]/[C\(_5\)H\(_5\)NH⁺] if the solution has the following pH values 4.50 is 6.30.

A buffer is indeed a solution that resists pH fluctuations and contains either a weak acid as well as its salt or perhaps a weak base as well as its salt. To put it another way, a buffer is indeed an aqueous solution that includes a weak base as well as its conjugate acid, or a weak acid as well as its conjugate base.

A buffer may also be referred to as a buffer solution, hydrogen ion buffer, and pH buffer.

pOH =PKb+log[salt]/[base]

pOH =14-pH= 14-4.50=9.5

pKb= -logKb

     =-log(1.7×10⁻⁷)

     =8.7

9.5 =8.7+log[salt]/[base]

9.5 -8.7=log[salt]/[base]

0.8=log[salt]/[base]

[salt]/[base] =10^0.8=6.30

[C\(_5\)H\(_5\)N]/[C\(_5\)H\(_5\)NH⁺]=6.30

Therefore, 6.30 is the value for [C\(_5\)H\(_5\)N]/[C\(_5\)H\(_5\)NH⁺].

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First, count the atoms on each side. Next, change the coefficient of one of the compounds. Once the equation is balanced, repeat steps two and three one more time while counting the atoms.

It is important to deduce the unbalanced equation from the reactant and product chemical formulas (if it is not already provided). It is necessary to compare the total number of atoms of each element on the reactant side and the product side. Stoichiometric considerations are now taken into account for molecules made up of an element that has a distinct number of atoms on both the reactant and product sides. The coefficient must balance the amount of atoms on either side. To calculate the number of atoms in one species, keep in mind that the stoichiometric coefficient must be multiplied by the total number of atoms of an element present in 1 molecule of the species.

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Answer:

Correct: B

Explanation:

The first block wont move because:

Σf=3-3=0N.

The second block will move because:

Σf:5-3=2N (direction to the right).

The third block will move because:

Σf=3N (direction to the right).

Answer:

this is because hot water has more energy than cold water

Answer:

To understand this first we must understand what is happening at the molecular level. When we heat any substance it changes its state of matter because its molecules get excited. For example, when we heat water it turns into gas so the molecules get excited. The hot air balloon will move faster if we add heat because the gas molecules will get excited and push against the balloon, making it faster. If we start removing heat, the balloon's acceleration will slow down because the molecules will get less excited.

Hot air balloons flies by means of it being lighter than air

The flame can be used to move the pilot to different directions by increasing the temperature of the air in the balloon and therefore, the volume, therefore, decreasing the density of the air which changes the elevation of the balloon to the appropriate elevation having winds moving in the desired direction

The principle by which the above process works is as follows:

According to Charles law, the volume of a mass of gas is directly proportional to its Kelvin temperature

V ∝ T

\(\dfrac{V_1}{T_1} = \dfrac{V_2}{T_2}\)

\(V_2 = T_2 \times \dfrac{V_1}{T_1}\)

\(Density, \rho = \dfrac{Mass, \ m}{Volume, \ V}\)

Therefore, as the temperature is increased, the volume occupied the mass gas increases, and therefore, the density decreases

The principle on which the hot air balloon operates on is the principle that hot air is less dense than and therefore, rises above cool air

Therefore, the pilot of an hot air balloon heats up the air in the balloon to allow the balloon to rise and the pilot switches off the burner so that the air in the balloon cools and the balloon looses altitude

The mechanism of the hot air balloon does not have a steering, and therefore, the wind direction is used to steer the balloon

The direction of the wind is different at different altitude, such that by obtaining the direction of the wind at a given altitude, the pilot can raise or lower the balloon up or down to the altitude having the desired wind direction, by increasing the temperature of the air in the balloon by switching on the burner to go to a higher altitude, or by switching off the burner so the air in the balloon cools and the balloon loses some of its altitude to reach the wind going in the direction of the pilot

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Answer:

0.05859091769326505 moles Mn203

Explanation:

Answer:

I'm sorry, I cannot provide exact temperature, salinity, or density values for specific ocean locations without further information. The values of these properties can vary greatly depending on many factors such as water depth, water circulation patterns, and local weather conditions. It is also worth noting that ocean temperature, salinity, and density can change over time and can fluctuate on a daily or seasonal basis.

Regarding the similarity in salinity in both areas, ocean salinity is primarily controlled by the balance between the input of freshwater from precipitation, rivers, and glaciers, and the output of salt through processes such as evaporation and the formation of sea ice. The similarity in salinity between two locations could be due to the presence of similar sources of freshwater or similar ocean circulation patterns that mix water from different sources and distribute salt and other dissolved substances evenly across the ocean. However, it is also possible that the salinity could be different due to other factors such as differences in ocean currents, water mixing, or local weather patterns.

The concentration of a sample of wine that contains 15 mL of ethyl alcohol in 200 mL of wine is 7.5 % v/v.

given that :

volume of solute = 15 mL

volume of solution = 200 mL

percent volume (v/v)% = (volume of solute/ volume of solution) × 100 %

percent volume (v/v)% = (15 mL / 200 mL ) × 100 %

percent volume (v/v)%  = 0.075 × 100 %

percent volume (v/v)%  = 7.5 % v/v.

Thus, The concentration of a sample of wine that contains 15 mL of ethyl alcohol in 200 mL of wine is 7.5 % v/v.

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Answer:

In a periodic table the average atomic mass of magnesium is given as 24.312 u.

Answer: Q=104525J

Explanation: where Q is the heat energy required to heat a mass, m , though a change in temperature of Δ T and c is the heat capacity of the material (found in books!). Typical units are Q in Joules or J , m in k g and Δ T is in either Kelvin, K , or degrees Celsius o C . The units of c depend on the other units used but J / k g o C is typical.

Answer:

See explanation

Explanation:

There are two main factors that affect the magnitude of thermal energy of a system.

The thermal energy of a system depends on

i) Temperature of the body

ii) Mass of the body

Thus, the greater the mass of a substance at a particular temperature, the greater its thermal energy.  Also, at a higher temperature, an object  has greater thermal energy.

The number of atoms per unit cell for polonium is eight.

In polonium's unit cell, there are eight atoms located at the corners. Since each atom at the corner is shared by eight adjacent unit cells, we consider one-eighth of each atom to be inside the unit cell, while the remaining seven-eighths are outside. Therefore, the unit cell of polonium contains eight atoms.

For tungsten, there is one atom in the center and eight atoms at the corners, similar to polonium. However, the question specifically asks for the number of atoms per unit cell for polonium, so we focus on that.

Nickel's unit cell, on the other hand, has six atoms within the faces and eight atoms at the corners. The six atoms within the faces are shared with adjacent unit cells, so we consider half of each atom to be inside the unit cell, making a total of three atoms.

Additionally, we have eight atoms at the corners, with one-eighth of each atom inside the unit cell, resulting in one atom. Therefore, nickel's unit cell contains a total of four atoms.

In summary, polonium has eight atoms per unit cell, while tungsten has one atom in the center and eight atoms at the corners, and nickel has three atoms within the faces and one atom at the corners.

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