fill in the blank. when working in the fume hood, it is important to make an effort to minimize choose___ only keep items in the hood if they are being used for choose___ do not choose___chemicals in the fume hood unless instructed to do so.

Option b is the proper answer. (ch3) In each pair of reactants below, 3n is one of the reactants, and (ch3)3n is the more nucleophilic of the two. In chemistry, a nucleophile is a chemical entity that forms bonds.

letting go of two electrons. All ions and molecules containing at least one pi bond or a free pair of electrons are considered nucleophiles. Because they give up electrons, Lewis bases are nucleophiles. When two or more atoms, molecules, or ions form a chemical connection, also known as chemical bonding, the result is a chemical compound. These chemical bonds are responsible for holding the atoms of the resultant molecule together. A chemical link is an attraction between atoms. This attraction could be attributed to a variety of different behaviours.

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a. Chlorine is a negatively charged ion based on the naming rules for ions (not a polyatomic ion).

The naming rules for ions are based on the element's name and the charge of the ion. A negatively charged ion is called an "anion". Anions are named by changing the ending of the element's name to -ide. In this case, "chlorine" is the element, and "chloride" is the negatively charged ion, or anion. "Chlorate" and "chlorite" are both polyatomic ions, which are ions composed of multiple atoms. The "ate" and "ite" endings indicate that these are polyatomic ions.

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The complete question is :

Based on the naming rules for ions, which of the following is a negatively charged ion (not a polyatomic ion)?

a. chlorine b. chlorate c. chloride d. chlorite

Answer:

Chloride

Explanation:

Negatively charged monatomic ions end in "ide" according to ion naming rules. If there are more electrons (negatively charged) than protons (positively charged), the ion will end with "ide". Sulfide is an example. Sulfur has 6 valence electrons. It could either lose 6 valence electrons or gain 2 to reach noble gas electron arrangement. Usually, the smallest electron exchange occurs, so sulfur would gain 2 valence electrons to fill its outer energy shell. The result would be 16 protons and 18 electrons. The sulfur ion symbol would be written as S2- or sulfide.

The right response is a. NaCl will have a lower boiling point than NaF because the coulombic attractions are weaker in NaCl than in NaF

The strength of the intermolecular interactions between a compound's particles determines its boiling point. The intermolecular interactions in an ionic compound like NaCl are electrostatic forces of attraction between the positive cations and the negative anions. The particles in an ionic compound are called ions. The charge of the ions and their separation from one another define the strength of these forces.

The cations in NaCl are Na+, while the anions are Cl-. Na+ has a radius of 76 pm, while Cl- has a radius of 181 pm. The distance between the ions in NaCl is higher than that in NaF, which has smaller ions, since the radius of Cl- is greater than that of Na+. As a result, in comparison to NaF, the electrostatic forces of attraction between the ions in NaCl are weaker. This indicates that the boiling point of NaCl is lower than that of NaF because less energy is needed to separate the ions in NaCl.

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The answers to the following calculations with the proper number of significant figures and with the correct units are: (a) 8.00 kg, (b) 22.6 g, (c) 3.45 cm³

What is significant figures?

Significant figures are a way to express the accuracy of a measurement. They are the digits that are known accurately plus one last uncertain digit. This last uncertain digit is estimated based on the precision of the measuring instrument. Significant figures are used to communicate the precision of a measurement to other scientists. The number of significant figures in a measurement is dependent on the measuring instrument used.

The answer should have two significant figures, since the least precise measurement, 12.90 kg, has two significant figures. The answer should have three significant figures, since the least precise measurement, 0.64 g, has three significant figures. The answer should have three significant figures, since the least precise measurement, 0.859 cm³, has three significant figures.

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Answer:

4.2 mL

Explanation:

To make the problem more interesting, let's assume that you don't know the formula for dilution calculations.

The idea with diluting a solution is that the number of moles of solute will remain constant after the initial solution is diluted. The only thing that changes in such cases is the volume of the solution.

Concentration of A to decrease to 1/e (37%) of its initial value is approximately 2.1 seconds. The rate of a second-order reaction is given by the equation: rate = k[A]^2 .

Where k is the rate constant and [A] is the concentration of the reactant. Given that the rate constant is k = and the initial concentration of A is [A]0 = , we can use the above equation to determine the rate of the reaction.

rate = k[A]^2 = ()( )^2

To find out how long it takes for the concentration of A to decrease to 1/e (37%) of its initial value, we can use the following equation:

[A] = [A]0e^(-kt) ,

Where t is the time in seconds.

Given that we want the final concentration of A to be

1/e (37%) of the initial concentration,

we can set up the following equation:

( ) = ( )e^(-kt) ; and solve for

t: t = -(1/k)ln(1/e)

t = -(1/( ))(ln(1/e))

t = -(1/( ))(ln(0.37))N

t = (1/( ))ln(2.70)

t ≈ 2.1 sec

So the time it takes for the concentration of A to decrease to 1/e (37%) of its initial value is approximately 2.1 seconds.

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The trend in the molar solubility of in different concentrations seen in the graph above appears to be best explained by the statement (a) "increasing concentrations of allow less to dissolve before the solution

The amount of a material present in a mixture or solution is referred to as its concentration. Different units, such as molarity (moles of solute per litre of solution), molality (moles of solute per kilogramme of solvent), or mass percentage, can be used to quantify them (mass of solute as a percentage of total mass). Concentrations play a key role in chemistry for predicting reaction behaviour and figuring out how much of a material to add to a solution. Concentrations are crucial in figuring out how various chemicals affect living things and the environment in sectors like environmental science and medicine.

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Ammonium sulfide nh4s is the name-formula pair that is incorrectly matched.

The formula is a fact or a rule that is expressed using mathematical symbols. Normally, three or more values are connected by an equal sign. When you know the value of one quantity, you may apply the formula to determine how much the other quantity is worth.

Following that, demand fell as households decided not to make purchases and instead made do about what they already had. When a result, formula producers would have to produce less as the market changed. Delays: Supply chain bottlenecks brought on by the epidemic continue to affect the production of baby formula. With the maker Abbott, delays brought on by the weather have also happened.

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Answer:

A. Use water and paper towels to clean up the spill; place the broken test tube in the disposal container specified by the teacher for Sharp objects

Answer:

  A)  5.0 atm

Explanation:

You want to know the pressure in a 1 L flask at 300 K when 0.03 mol of C₃H₈ reacts completely with O₂.

We suppose the reaction of interest is ...

  C₃H₈(g) +5O₂(g) ⇒ 3CO₂(g) +4H₂O(g)

This shows us there are 3+4 = 7 moles of products for each mole of C₃H₈ in the reaction. That is, there will be 0.03 mole × 7 = 0.21 mole of products.

The gas law equation tells us the final pressure can be computed by ...

  PV = nRT

  P = nRT/V = (0.21 mol)(0.082 L·atm/(mol·K)(300 K)/(1 L) ≈ 5.166 atm

The total pressure in the flask after the reaction is closest to ...

  A) 5.0 atm

All of the above options would change the vapor pressure of a sample of water in a closed container.

Vapor pressure is a measure of the tendency of a substance to turn into a gas at a given temperature. It is related to the kinetic energy of the molecules of the substance, with more energetic molecules having a higher vapor pressure. In a closed container, the vapor pressure of a liquid will be determined by the temperature and the number of molecules present.

It's also worth noting that the vapor pressure of a liquid is also related to its boiling point. The boiling point is the temperature at which the vapor pressure of a liquid equals the atmospheric pressure. As the vapor pressure of liquid increases, its boiling point increases, and as the vapor pressure decreases, its boiling point decreases.

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2-penten-1-ol is a primary allylic alcohol that is 2-pentene in which a hydrogen at position 1 has been replaced by a hydroxy group.

Define penten -1?

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The indium has only two naturally occurring isotopes. The mass of the indium-113 is 112.9041 amu and the mass of indium-115 is 114.9039 amu. The  relative abundance of indium-115 is 57 %.

The average atomic mass is given as follows :

Average Atomic Mass = ∑(Relative Abundance × Mass)

The mass of indium-113 = 112.9041 amu

The mass of indium-115 = 114.9039 amu

Relative abundance for indium-113 =x

Relative abundance for indium-115 = (1-x)

x(112.9041) + (1 - x)(114.9039) = 114.818

x = 0.043 = 4.3 %

Relative abundance for indium-113 = 4.3 %

Relative abundance for indium-115 = 1 - 0.43

                                                         = 0.57 = 57 %

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The correct statements about the mechanism of the reaction between an organometallic reagent and an aldehyde or ketone is all of the above.

The mechanism of the reaction between an organometallic reagent and an aldehyde or ketone is given as :

1) The carbon group of the organometallic reagent will acts as the nucleophile.

2) The intermediate of the reaction is the tetrahedral species.

3) The final step of the reaction is that involves protonation of the alkoxide of oxygen.

Thus, the all the given statements is true for the mechanism reaction between the organometallic reagent and the aldehyde or the ketone .

This question is incomplete, the complete question is :

select all the statements that correctly describe the mechanism of the reaction between an organometallic reagent and an aldehyde or ketone.

The carbon group of the organometallic reagent acts as the nucleophile.

The intermediate of the reaction is a tetrahedral species.

The final step of the reaction involves protonation of the alkoxide oxygen.

All of the above.

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The exothermic dissolution of mg(oh)2(s)will increase the solubility of mg(oh)2 in an aqueous solution increasing the pH.

The solubility of a substance in water is affected by its solubility product constant (Ksp) and the pH of the solution. Ksp is a measure of the maximum concentration of a substance that can be dissolved in water at a given temperature and pressure. In this case, the Ksp of Mg(OH)2 is 1.8 x 10-11.

Increasing the pH of the solution will increase the solubility of Mg(OH)2 because it will shift the equilibrium of the dissolution reaction in favor of the products. This is because the dissolution reaction is exothermic, meaning that heat is released when the Mg(OH)2 dissolves. This heat release causes the equilibrium to shift towards the product side.

On the other hand, decreasing the pH, adding NH3, or adding Mg(NO3)2 will not affect the solubility of Mg(OH)2 in the solution. Hence options a, c, and d are not correct.

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The temperature of the water in degrees Fahrenheit and kelvin are:

To convert the temperature of scalding water, 54 degrees Celsius, into degrees Fahrenheit, you can use the following formula:

F = (°C x 9/5) + 32

So:

(54 x 9/5) + 32 = 129.2 °F

To convert the temperature of scalding water, 54 degrees Celsius, into Kelvin, you can use the following formula:

°C + 273.15 = K

So,

54 + 273.15 = 327.15 K

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All of the following are postulates of the kinetic molecular theory of gases except option D. (at a constant temperature, each molecule has the same kinetic energy).

It is not a postulate of the kinetic theory of gases because the theory states that at a constant temperature, all molecules have the same average kinetic energy as it varies for different molecules due to the fact that they have different velocities.

A qualitative and quantitative description of the characteristics of an ideal gas can be found in something called the kinetic molecular theory. It defines how the molecules move and how they interact with each other while treating the molecules that make up the gas as if they were point masses. In addition to this, it clarifies the connection that exists between the velocities, pressure, and kinetic energy of the molecules.

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A survey in which anonymous respondents, without fear of disclosure or arrest, are asked to report confidentially any violations of the criminal law they have committed is referred to as self-report survey.

Since participants are assured of their anonymity and confidentiality, they are more likely to accurately record any prior criminal behavior without worrying about facing repercussions. However, This type of poll is known as a self-report survey. It's a method for gathering data about criminal or abnormal behavior that's employed in criminology and social science research. The validity of self-report questionnaires can be affected by under- and over-reporting, social desirability bias, and memory issues. It is crucial for researchers to be aware of these restrictions and make the appropriate measures to lessen their impact on survey results. This type of poll is known as a self-report survey. It's a method for gathering data about criminal or abnormal behavior that's employed in criminology and social science research.

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The actual question is:

A survey in which anonymous respondents, without fear of disclosure or arrest, are asked to report confidentially any violations of the criminal law they have committed is referred to as _______________.

The compounds that are the same among the given options are as follows: compound 1 and 2 (option C).

A chemical compound is a substance formed by the union of two or more chemical elements in a fixed ratio, the union being a chemical bond.

A chemical compound is made up of elements with given proportions. According to this question, a compound made up of hydrogen and oxygen with different proportions.

Based on the given proportions of hydrogen and oxygen in the above compounds, compound 1 and 2 are similar because they have an equal ratio of 8.09 i.e.

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Renewable energy is increasing its relative share of the global energy supply by the most since 2015. (A)

Both globally and in the United States, renewable energy is the source of power that is expanding at the highest rate. At roughly 11.7%, the share of total energy consumption that came from renewable sources in the United States in 2019 was at its highest level since the 1930s. Solar and wind power generation have seen the most significant increases in their market share among renewable energy sources over the past ten years. In recent years, there has also been a growth in the use of liquid biofuels, which has contributed to the growing share of renewable energy in overall energy consumption. In 2020, renewable energy production in the United States finally topped coal usage for the first time.

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For the following gas-phase reaction, the rate of disappearance of N2O related to the rate of appearance of N2:

The rate of a chemical reaction is expressed as the rate of reduction in the concentration of reactants (reactants) per unit of time or increasing the concentration of the reaction product per unit time.

There are four factors that affect the reaction rate, namely:

1. Concentration

The working principle of concentration can increase the reaction rate because the higher the concentration, the more particles collide, thus increasing the reaction rate

2. Surface Area

Surface area can affect the rate of reaction because the larger the surface area, the more particles will collide, so the greater the reaction rate

3. Temperature

The working principle of temperature can increase the rate of reaction is to increase the kinetic energy of the reacting particles.

4. Catalyst

The working principle of a catalyst to increase the reaction rate is by lowering the activation energy of the reaction.

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The molar mass of the polyetheylene molecule is  4200 g/mol.

We know that a polymer is said to be formed by the combination of so many units that are joined together. The single units that we have to join together so as to form the polymer is what we call the monomers.

Now we are told that the number of repeated monomer units, for polyethylene is 150.

Molar mass of the ethylene = 2(12) + 4(1) = 28 g/mol

Molar mass of the polyethylene = 150 * 28 g/mol = 4200 g/mol

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Answer: For the bromide ion with a mass number of 79 and a charge of -1, there are 36 electrons, 35 protons, and 44 neutrons present for the element that has a mass

For the element that has a mass number of 56 and 30 neutrons

Explanation:

Answer:

mmHg is cooled to give a pressure of 580. mmHg. Express your answer to two significant figures and include the appropriate units. Å o D Explanation:

Between 80 to 88%, which is equivalent to that of typical plant meals but somewhat less than that of animal proteins

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The rate of reaction depends on only one of the species.

The order of a reaction is a measure of the dependence of the reaction rate on the concentration of reactants.

A reaction of zero order has a rate that is independent of the concentration of reactants, while a reaction of first order has a rate that is directly proportional to the concentration of one reactant, and so on. The overall order of a reaction is the sum of the orders of the reactants in the rate equation.

In this case, we can see that the rate of reaction depends on only one reactant.

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agriculture. The largest source of pollution to the Bay comes from agricultural runoff, which contributes roughly 40 percent of the nitrogen and 50 percent of the phosphorus entering the Chesapeake Bay.

Airborne nitrogen is one of the most significant polluters of the Chesapeake Bay and its tributaries. Excess nitrogen may drive the growth of algae blooms, preventing sunlight from reaching underwater grasses and creating low-oxygen "dead zones" that smother marine life. Nitrogen and phosphorus occur naturally in aquatic habitats, but human activities such as fertilizer usage, wastewater management, fossil fuel combustion, and soap and detergent discharge inject excess nutrient pollution into ecosystems quicker than ecosystems can respond. 1At Home and Around the Neighborhood: Fertilizers, yard and pet waste, and some soaps and detergents contain nitrogen and phosphorus and, if not utilized or disposed of appropriately, can contribute to nutrient contamination.

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Chromosome separation in bacteria starts just at DNA replication start site. Chromosomes that have been doubled before eukaryotes are divided condense.

Heating or electrical energy can be used to break down compounds. The energy disrupts the bonds that hold the atoms together and initiates a chemical reaction. The compound can split into two simple compounds or be broken into separate atoms when the bonds break down.

We must separate mixes for the reasons listed below: To remove the unnecessary components from a combination, various components of the mixture are separated. to take important components out of a combination in more than one place. to acquire pure materials.

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The equipment needed to measure moles in chemistry would be the weighing balance.

In chemistry, the mole of a substance is the ratio of the mass of the substance and its molar mass. It is otherwise known as the number of moles in substances and can be mathematically expressed as:

Mole = mass/molar mass

Thus, in order to find the number of moles present in a substance, the mass of the substance must be known and the molar mass is calculated appropriately.

Since the molar mass of substances is determined from the sum of molar masses of atoms of elements present in the chemical formula of the substance, the molar mass is theoretical.

However, to find the mass of the substance, it has to be weighed using a suitable measuring scale, usually in the form of a weighing balance.

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Your best protection against losing your data is to back up your files to your hard drive. Firewalls inspect data transmitted between a computer and external recipients to prevent unsolicited data exchanges

What is password-protection?

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