a 69.0 ml portion of a 1.70 m solution is diluted to a total volume of 228 ml. a 114 ml portion of that solution is diluted by adding 121 ml of water. what is the final concentration? assume the volumes are additive.

The expected product is (R)-2-bromobutane.

Stereochemistry plays a crucial role in determining the outcome of chemical reactions. In the given question, the stereochemistry of the intermediate I needs to be considered to determine the expected product.

The intermediate I indicates a chiral carbon center, denoted by an asterisk (*), which means it has four different substituents attached to it. This chiral carbon results in two possible stereoisomers: (R)-2-bromobutane and (S)-2-bromobutane.

When a reaction occurs at a chiral carbon, the stereochemistry of the reactant is usually retained in the product, assuming no racemization or inversion takes place during the reaction. In this case, the intermediate I has an (R) configuration, which implies that the product will also have an (R) configuration.

Therefore, the expected product is (R)-2-bromobutane.

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Answer:

12CO2 (g) + 12H2O (l) ⇒ C12H24O12 (s) + 12O2

Explanation:

Start by comparing the moles of carbons on the left to number on the right. The number of moles on both side of the arrow should be the same.

Answer:

C12H24O12 + 12O 2 → 12CO2 + 12H2O

Explanation:

Hope this helps

Answer:

D. \( O^{2-}\)

Explanation:

In Chemistry, electrons can be defined as subatomic particles that are negatively charged and as such has a magnitude of -1.

Valence electrons can be defined as the number of electrons present in the outermost shell of an atom. Valence electrons are used to determine whether an atom or group of elements found in a periodic table can bond with others. Thus, this property is typically used to determine the chemical properties of elements.

Oxygen has a total number of eight (8) electrons and as such the \( O^{2-}\) is able to gain (receive) two (2) more electrons in order to have the same electron arrangements as the noble gas i.e an atom of neon that has a total number of ten (10) electrons.

Hence, \( O^{2-}\) contains the same number of electrons as an atom of neon.

A negatively charged core nucleus and one or more orbiting electrons make up an atom. There may be the positively charged, somewhat massive protons and neutrons that make up the nucleus. Atoms are the basic building blocks of stuff.

In a neutral atom, there are exactly as many electrons as protons. The total number of protons and neutrons in the atom's nucleus is equal to the mass number (M) of the atom. The difference between the atomic number and the mass number of the atom (M) is equal to the amount of neutrons (Z).

Absorption is the process by which an atom transitions from its ground state to an excited state by absorbing energy from its environment. After absorbing the energy, the electron advances to a higher energy state. Up the opposite process, called emission, the electron releases the excess energy it had taken in and goes back to its ground state.

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To determine the heat expelled into the heat reservoir by the refrigerator, we can use the coefficient of performance (COP) and the amount of heat absorbed from the cold reservoir.

The coefficient of performance (COP) of a refrigerator is defined as the ratio of heat extracted from the cold reservoir to the work done on the refrigerator. In this case, the COP is given as 4.

COP = Heat extracted from cold reservoir / Work done on the refrigerator

Since the work done on the refrigerator is not provided in the question, we cannot directly calculate the heat expelled into the heat reservoir. However, we can use the COP to infer the relationship between the heat extracted and the heat expelled.

COP = Heat extracted from cold reservoir / Heat expelled into heat reservoir

By rearranging the equation, we can solve for the heat expelled into the heat reservoir:

Heat expelled into heat reservoir = (Heat extracted from cold reservoir) / COP Plugging in the given values:

Heat expelled into heat reservoir = 30 cal / 4

Heat expelled into heat reservoir = 7.5 cal

Therefore, the heat expelled into the heat reservoir by the refrigerator is 7.5 cal.

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Answer:

B if I'm not mistaken

hduekke

Answer:

A I think

Explanation:

You weigh more in more gravity

Answer:

The insect exerts no force on the windshield, and the windshield strikes the insect with a large force.

Explanation:

:#D

Thus the final pressures of N₂ and H₂ are 825.7317torr and 550.6944torr respectively.

It is given that the Volume(V₁) of nitrogen is 30L and Pressure(P₁) of Nitrogen is 740torr and the temperature(T₁) is 55°C.

Similarly, for hydrogen, the volume(V₁) is 20L and Pressure(P₁) is 650torr and temperature(T₁) is 15⁰C.

These two are pumped into a container of Volume(V₂) of 25L and temperature (T₂) 32⁰C

To find the Final pressure of N₂, the following formula is to be used

P₁V₁/T₁ = P₂V₂/T₂

On substituting the values of P₁,V₁,T₁,V₂,T₂ we get P₂ of N₂ as,

(740x30)/328 = 25xP₂/305K

22200/328 =  25xP₂/305K

67.6829x305 = 25P₂

20643.2926/25 = P₂

825.7317torr = P₂

P₂= 825.7317torr

Therefore, the final pressure of N₂ is 825.7317torr

Similarly to find the final pressure of H₂ by applying the same formula we get,

P₁V₁/T₁ = P₂V₂/T₂

On substituting the values of P₁,V₁,T₁,V₂,T₂ we get,

(650x20)/288 = (P₂x25)/305

13000/288 = (P₂x25)/305

45.1388x305 = 25P₂

1376.3611/25 = P₂

550.6944 = P₂

P₂ = 550.6944torr

Therefore, the final pressure of H₂ is 550.6944torr.

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0.636 liters of the 1.10 M FeCl₃ solution to obtain 0.700 moles of Cl⁻ ions.

Thus, Volume (L)=  moles/ concentration.  0.700 moles of Cl⁻ ions and the concentration of the FeCl₃ solution is 1.10 M, you can plug in these values to calculate the volume.

Volume (L) = 0.700/ 1.10 M,

Volume (L)=  1.10M/ 0.700moles

Volume (L) = 0.700/ 1.10 ≈ 0.636 L

Therefore, approximately 0.636 liters of the 1.10 M FeCl₃ solution to obtain 0.700 moles of Cl⁻ ions.

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The critical value for an independent-samples t-test is total degrees of freedom. Option C.

Each topic must belong to only one group. There is no relationship between observations in each group. There are no significant outliers in the two groups. The independent-sample t-test is appropriate when the researcher wants to know whether the means of her two population groups differ.

Independent samples t-test tells whether the organization has a statistical difference between her two sets of categories or items, and if there is a statistical difference, the difference is significant.  when the observations in each group are independent of the observations in the other group increase.

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Answer:

When you stir a spoonful of sugar into a glass of water, you are forming a solution.

The mass for this amount of liquid, with density of 1.4g/mL and volume, 17 mL is equals to the 23.8 grams.

We have, a liquid with the following informations,Density of liquid, D = 1.4g/mL

Volume of liquid, V = 17 mL

The density of a liquid is a measure of how heavy it is for the amount being measured. If two different liquids have the same amount or volume, the liquid that weighs more is denser. The equation to calculate density is given by the formula Density = Mass/Volume. Let the mass for this amount of liquid be 'M'.

So, D = M/V => M = D×V

Thus, Mass for this amount of liquid, M

= 1.4g/mL × 17 mL

= 1.4 × 17 g

= 23.8 grams

Hence, required mass of amount is 23.8 g.

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The element that crystallizes in a face-centered cubic (FCC) arrangement with a density of 6.657 g/cm³ and an atomic radius of 183.5 pm is Aluminum (Al).

The formula for calculating the density (ρ) of a metal with a face-centered cubic structure is:ρ = (Z × M) / (a³ × N_A),where Z is the number of atoms in a unit cell, M is the molar mass of the metal, a is the edge length of the unit cell, and N_A is Avogadro's number (6.022 × 10²³ mol⁻¹).

In the case of a face-centered cubic structure, Z is 4, and a is related to the atomic radius (r) as follows:

a = 4√(2) × r. Given that the density (ρ) is 6.657 g/cm³ and the atomic radius (r) is 183.5 pm (or 1.835 Å), we can substitute these values into the equations and solve for the molar mass (M).

r = 183.5 pm = 183.5 × 10⁽⁻²³⁾ cm.

Next, calculate the edge length (a) using the atomic radius:

a = 4√(2) × r = 4√(2) × 183.5 × 10⁽⁻¹⁰⁾ cm.

M = (ρ × a³ × N_A) / (Z).

M = (6.657 g/cm³ × (4√(2) × 183.5 × 10^(-10) cm)³ × 6.022 × 10²³mol⁽⁻¹⁾) / 4.

The element that crystallizes in a face-centered cubic (FCC) arrangement with a density of 6.657 g/cm³ and an atomic radius of 183.5 pm is Aluminum (Al).

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Answer:

As

Explanation:

because of ionic bond

Explanation:

Chemistry is the scientific discipline involved with elements and compounds composed of atoms, molecules and ions: their composition, structure, properties, behavior and the changes they undergo during a reaction with other substances.

Answer:

Explanation:She was wrong

The class of database technology used to store textual and other unstructured data is called NoSQL databases.

The class of database technology used to store textual and other unstructured data is called NoSQL databases.

Traditional databases, such as relational databases, are designed to handle structured data in a well-defined schema. However, with the proliferation of big data, social media, and the Internet of Things (IoT), there has been a growing need to store and manage unstructured data, such as text, images, audio, and video. NoSQL databases have emerged as a solution to handle such unstructured data in a flexible and scalable way.Here are some popular types of NoSQL databases:

Document-oriented databases: These databases store data in a document format, such as JSON or XML, and provide powerful querying capabilities. Examples of document-oriented databases include MongoDB and Couchbase.

Key-value stores: These databases store data in a key-value pair format, making them ideal for caching and session management. Examples of key-value stores include Redis and Amazon DynamoDB.

Column-family stores: These databases store data in columns rather than rows, making them ideal for big data analytics and distributed storage. Examples of column-family stores include Apache Cassandra and HBase.

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Answer:

10000 g BaNO₃

General Formulas and Concepts:

Chemistry - Atomic Structure

Explanation:

Step 1: Define

3.02 × 10²⁵ formulas units BaNO₃

Step 2: Identify Conversions

Avogadro's Number

Molar Mass of Ba - 137.33 g/mol

Molar Mass of N - 14.01 g/mol

Molar Mass of O - 16.00 g/mol

Molar Mass of BaNO₃ - 137.33 + 14.01 + 3(16.00) = 199.34 g/mol

Step 3: Convert

\(3.02 \cdot 10^{25} \ formula \ units \ BaNO_3(\frac{1 \ mol \ BaNO_3}{6.022 \cdot 10^{23} \ formula \ units \ BaNO_3} )(\frac{199.34 \ g \ BaNO_3}{1 \ mol \ BaNO_3} )\) = 9996.79 g BaNO₃

Step 4: Check

We are given 3 sig figs. Follow sig fig rules and round.

9996.79 g BaNO₃ ≈ 10000 g BaNO₃

Answer:

94.2 g/mol

Explanation:

Ideal Gases Law can useful to solve this

P . V = n . R . T

We need to make some conversions

740 Torr . 1 atm/ 760 Torr = 0.974 atm

100°C + 273 = 373K

Let's replace the values

0.974 atm . 1 L = n . 0.082 L.atm/ mol.K . 373K

n will determine the number of moles

(0.974 atm . 1 L) / (0.082 L.atm/ mol.K . 373K)

n = 0.032 moles

This amount is the weigh for 3 g of gas. How many grams does 1 mol weighs?

Molecular weight → g/mol → 3 g/0.032 moles = 94.2 g/mol

Increasing the concentration of N2(g) will causes the equilibrium to shift to the right.

Chemical equilibria can be shifted by changing the conditions that the system experiences. We say that we "stress" the equilibrium. When we stress the equilibrium, the chemical reaction is no longer at equilibrium, and the reaction starts to move back toward equilibrium in such a way as to decrease the stress.

According to Le Chatelier's principle, a change in one of the variables that describe a system at equilibrium produces a shift in the position of the equilibrium that counteracts the effect of this change.

In the synthesis of ammonia the equilibrium will shift to right only when we increase the concentration of N2(g). Because increasing nitrogen gas causes more ammonia to be produced, so the concentration of ammonia must increase.

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The equation Ka = ([H+]^2)/c to find the acid dissociation constant (Ka).

To calculate the acid dissociation constant (Ka) for the monoprotic acid, we can use the pH of the solution and the concentration of the acid. The pH of the solution is given as 2.30.

Step 1: Convert the pH to [H+]
Since the pH is given, we can calculate the concentration of hydrogen ions ([H+]) using the equation pH = -log[H+]. Therefore, [H+] = 10^(-pH). Substituting the given pH value into the equation, we find [H+] = 10^(-2.30).

Step 2: Calculate the concentration of the acid
The concentration of the acid (c) is given as 0.0103 M.

Step 3: Calculate the acid dissociation constant (Ka)
The acid dissociation constant (Ka) is given by the equation Ka = [H+][A-]/[HA], where [H+] is the concentration of hydrogen ions, [A-] is the concentration of the conjugate base, and [HA] is the concentration of the acid. Since the acid is monoprotic, [A-] is equal to [H+]. Therefore, Ka = [H+]^2/[HA]. Substituting the values into the equation, we have Ka = ([H+]^2)/c.

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Answer:

0.1 moles of N2 will react with 0.3034 moles of Mg.

Explanation:

\(\sf{balanced \ eqaution = 3Mg + N2 \rightarrow Mg3N2}\)

using molar ratio:

3Mg : N2

3 : 1

moles of N2:

\(\hookrightarrow \sf\frac{0.3034 }{3} *1\)

\(\hookrightarrow \sf 0.10113 \ moles \ of \ N2\)

Answer:

10.24 ×10²³ molecules

Explanation:

Given data:

Mass of COCl₂ = 218.4 g

Number of molecules = ?

Solution:

Number of moles of COCl₂:

Number of moles = mass/molar mass

Number of moles = 218.4 g/ 129.84 g/mol

Number of moles = 1.7 mol

1 mole contain 6.022×10²³ molecules.

1.7 mol × 6.022×10²³ molecules / 1mol

10.24 ×10²³ molecules

Sio2, also known as silicon dioxide or silica, is most likely a covalent-network solid.

To determine the type of solid, we need to analyze the nature of bonding in SiO2. Silicon (Si) and oxygen (O) are both nonmetals, and their bonding is typically covalent.

In SiO2, silicon forms four covalent bonds with four oxygen atoms, and each oxygen atom forms two covalent bonds with two silicon atoms. This results in a three-dimensional network structure of alternating silicon and oxygen atoms.

Covalent-network solids have a high melting point, are hard and brittle, and do not conduct electricity because the electrons are localized within the covalent bonds. In the case of SiO2, the strong covalent bonds between silicon and oxygen atoms give rise to its characteristic properties.

Based on the nature of bonding in SiO2, it is most likely a covalent-network solid. The three-dimensional network structure formed by covalent bonds between silicon and oxygen atoms is responsible for its high melting point and other properties associated with covalent-network solids.

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Answer:

I would say ether the first one or the third one because on those questions you always want to choose the one that gives the most information or sound more believe

Hope this helped

The item that would most likely end up in the waste stream soonest is a single-use plastic item, such as a plastic bag or disposable plastic utensil. These items are designed for short-term use and are typically discarded shortly after use.

The item that would most likely end up in the waste stream soonest would be a disposable plastic water bottle. These bottles are commonly used and quickly disposed of after a single use, contributing to the waste stream more quickly than other durable or reusable items. In general, reducing waste generation, practicing responsible consumption, and promoting recycling and other sustainable waste management practices can help minimize the impact of waste on the environment.

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Answer:

Kristy thank you doing today hope you doing recently

Radio waves, ultraviolet rays, X-rays, and gamma rays are all examples of electromagnetic radiation, as are microwaves.

There are several uses for microwaves, including for communications, radar, and—possibly for the most part—cooking. Waves or particles of electromagnetic radiation with various wavelengths and frequencies are communicated.

The electromagnetic spectrum (EM spectrum) is the name given to this wide spread of frequencies. In general, the spectrum is divided into seven areas in ascending sequence of increasing energy and frequency and decreasing wavelength.

Radio waves, microwaves, infrared (IR), visible light, ultraviolet (UV), X-rays, and gamma-rays are some of the common names for these types of energy. In the electromagnetic (EM) spectrum, microwaves are found between radio and infrared light.

Therefore, Radio waves, ultraviolet rays, X-rays, and gamma rays are all examples of electromagnetic radiation, as are microwaves.

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People in San Antonio and Central Texas would probably notice an increase in the amount of insects that the bats typically consume if the bat population in Bracken Cave substantially fell.

The increase in bug populations could cause more crop damage, which would affect local agriculture and food production. Because some insects act as carriers for diseases that can be harmful to humans and animals, an increase in bug populations could increase the risk of disease transmission.

Bats are vital to the local economy because they help to reduce the need for pesticides and regulate insect populations. If their population falls, their local businesses and industries may experience financial hardship.

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