Which of the following were goals of Reconstruction? Check all of the boxes that apply. to reincorporate the South into the Unionto create a segregated society in the Southto establish equality under law for African Americansto assist African Americans in the transition from slavery to freedom

Answer:

You have to divide grams of iron by molar mass of iron. Molar mass is the same as atomic mass.

558.4/55.8

10.007 moles

Hope this helps!!!

All of the given options are correct and define the chemical properties of materials.

A. Materials that have a low melting point would be dangerous to use when temperatures are hot- Low melting points are very beneficial for a number of reasons, but they also unfavorably have a propensity to be poisonous or radioactive, Low bond energy and non-close packed crystal formations are common characteristics of metal elements with low melting points.

B. Flammable materials would be dangerous to use near fire -Fires are easily started by flammable materials. They can exist as solids, liquids, or gases. Liquid petroleum gas (LPG), paints, varnishes, and lacquers are typical flammable substances encountered in workplaces. Flammable materials present significant

C. A material's reactivity affects how long it will last under certain conditions- The less reactive a reactant is, the more stable it is. This implies that the rate of reaction will be slower the more stable the reactant. 2. Product Stability/Reactivity: The product's formation will be more advantageous the more stable the product is.

D.  A material's ability to break or bend affects how well it will work for certain uses. A material's tensile strength, often known as its capacity to withstand being pulled apart by opposing forces, is the maximum tension load it can withstand before breaking. It is the highest strength a metal may acquire during a tension test, also known as ultimate strength.

Hence, all of the given options define chemical properties of materials.

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The pH of the resulting solution is 7.

pH is determined by the concentration of hydronium and hydroxyl ions in a solution. pH is also known as the negative logarithm of hydrogen ion concentration.

     pH determines the acidity and basicity of a given solution. It determines the number of protons that has been released or donated. In the given condition we have.

1.47 molar NH3that has been titrated to 0.20 molar HCL.

       For 20 ml of solution, we get pH of 7.

Therefore, the pH of the give solution is 7.

Titration is used in quantitative tests while maintaining the concentration of the solution. A slight change in color marks the equalizing of volume and concentration.

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The molarity of anions in the chemist's solution is 0.07629 M

What is chemical reaction ?

Chemical reaction, the process by which one or more substances (reactants) are transformed into one or more other substances (products). Substances are either chemical elements or compounds. Chemical reactions rearrange the constituent atoms of reactants to produce different substances as products.

Chemical reactions are an integral part of technology, culture, and even life itself. Fuel combustion, iron smelting, glass and pottery making, beer brewing, and wine and cheese making are just a few examples. Activities involving chemical reactions that have been around for thousands of years. Chemical reactions are abundant in a variety of complex processes that occur in Earth's geology, atmosphere and oceans, and in all biological systems.

1.20 g of VCl3 = mass / molar mass = 1.20 g / 157.3 g/mole = 7.629 * 10^-3 mole.

and

volume of solution = 300ml = 0.300 L

thus

molarity of VCl3 = 7.629 * 10^-3 mole / 0.300 L = 0.02543 M

VCl3 ............> V^3- + 3 Cl-

VCl3 produce three Cl- ions in water.

thus

molarity of Cl− anions = 3 * [VCl] = 3 *  0.02543 = 0.07629M

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Answer:

2.34 x 10⁻⁹ m  

Explanation:

To find the wavelength, you need to use the following equation:

λ = c / f

In this equation,

-----> λ = wavelength (m)

-----> c = speed of light (3.00 x 10⁸ m/s)

-----> f = frequency (Hz or s⁻¹)

You can find the wavelength by plugging the given value and constant into the equation and solving for "λ". The final answer should have 3 sig figs like the given value (1.28 x 10¹⁷ = 3 sig figs).

λ = c / f                                                             <----- Given Equation

λ = (3.00 x 10⁸ m/s) / (1.28 x 10¹⁷ Hz)              <----- Insert variables

λ = 2.34 x 10⁻⁹ m                                            <----- Divide

Placed in boiling hot water and the freezer. Explain why the temperature was rising at a specific moment within that interval. 10.6°F/sec. 212°.

When you veer off topic, you discuss or write about a different subject for a while before returning to your original topic. I've gone off topic a bit to explain the scenario thus far, so let will now summarize. She departed from the topic of her prepared remarks to honor the president.

The definition of "digress" (pronounced "dars") in the Webster Encyclopedic English Dictionary as well as the Cambridge Dictionary is "to wander away or veer from the current topic or subject of conversation or writing."

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NADH is not required in the synthesis of fatty acids.

Fаtty аcids аre cаrboxylic аcids thаt аre structurаl components of fаts, oils, аnd аll other cаtegories of lipids, except steroids.

Thus, the correct option is E.

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Considering the Noble Gases, the correct answer is the third option: Xenon it will likely be unreactive because it is a noble gas.

Valencia electrons are the electrons found in the last electronic layer (called valence orbitals). These electrons are what determine the ability of the atom to form bonds.

The noble gases are a group of elements of the periodic table that are characterized, under normal conditions of pressure and temperature, as monatomic gases without odor, without color and with very low chemical reactivity.

The noble gases encompass the elements in group 18 of the periodic table and include six elements: Helium, Neon, Argon, Krypton, Xenon, and Radon.

The noble gases are characterized by complying with the octet rule, that is, they have 8 electrons in their last energy level, with the exception of helium. This complies with the duet rule, because it only has two electrons.

In this way, the noble gases cannot have more electrons in their last energy level, because this level is already complete and stable. In this way, the noble gases have such a low reactivity and do not combine with other atoms, also calling them inert gases.

In summary, Xenon is a noble gas and it will likely be unreactive.

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The volume of the gas at constant temperature would be 4.60 L.

How this is done?

P1 = 1.5 atm

V1 = 5 lit

P2 = 1240 mm Hg = 1.63 atm

V2 = ?

P1V1 = P2V2

1.5 X 5 = 1.63 X V2

V2 = 7.5

The volume of a fixed mass of a gas decreases on cooling it and increases by increasing the temperature.

V1 / T1 = V2 / T2 (Sometimes known as Charles's Law)

V1 =  is the starting volume

T1 =  is the starting temperature

V2 = is the finishing volume

T2 is the finishing temperature

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When a liquid's freezing point is lowered or lowered by the addition of another component, freezing point depression occurs.

What is freezing point depression?
This will probably be the case for every issue you run into in this course involving freezing point depression as well as boiling point elevation, but it's a good idea to watch out for ions. It is important to note that both nonvolatile and volatile solutions can be modelled by these equations. This implies that the vapour pressure has no bearing on the change in temperature for the purpose of determining the freezing point depression as well as boiling point elevation. Additionally, keep in mind that a pure solvent is indeed a solution that hasn't had anything else dissolved or added to it. We'll contrast the solvent's original properties with those it acquires after being mixed with a solution.

ΔTf= Kf · b · i

ΔTf =freezing-point depression

Kf    =cryoscopic constant

b =molality

i =van 't Hoff factor

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Answer:

1.18 g/mL

Explanation:

1.2 g/mL at 25 °C

The primary component of gastric acid, which is created naturally in the human stomach to aid in food digestion, is hydrochloric acid, which is the aqueous solution of hydrogen chloride gas. For a number of industrial and commercial uses, hydrochloric acid is manufactured synthetically.

In the food, textile, metal, and rubber sectors, hydrogen chloride (HCl) is frequently employed as a bleaching agent to neutralize alkaline substances. When discharged into the soil, it is neutralized, and when it comes into contact with water, it hydrolyzes quickly.

The gases released by volcanoes contain hydrochloric acid. Additionally, the majority of mammals' digestive tracts include hydrochloric acid.

When hydrogen chloride is present in the air in high concentrations, breathing can be dangerously difficult and even deadly. Chemical burns from hydrochloric acid can be extremely painful if they come into contact with skin or other tissues. Ingestion of hydrochloric acid can result in blindness.

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Taq polymerase can withstand the high temperatures involved in PCR reactions whereas other normal DNA polymerases can get degenerated due to such high temperatures.

What is Taq polymerase?
In honour of the psychrophilic eubacterial microorganism Thermophiles aquaticus, from which it was first isolated by Chien et al. in 1976, I gave the thermostable DNA polymerase Taq its name. Taq as well as Taq pol are common shortened forms of its name. The polymerase chain reaction (PCR), a technique for greatly amplifying the quantity of brief segments of DNA, frequently employs it. The bacterium T. aquaticus is found in hot springs as well as hydrothermal vents, as well as Taq polymerase was found to be an enzyme that could withstand the protein-denaturing temperatures needed for PCR. Thus, it took the place of the DNA polymerase from E. coli that was initially utilised in PCR.

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Duplication and deletion are brought on by a nonreciprocal crossing. When genetic material is transferred to one genome but not the other, this is known as a nonreciprocal crossover.

When genetic material is transmitted to one genome but not the other, this is known as a nonreciprocal crossover. No genetic material will then be added to replace the donated material, leaving the giving chromosome with a loss. Uneven crossing over is a sort of gene duplication or deletion process that eliminates a sequence from one strand and substitutes a duplication from the homologous chromosome during meiosis or from the sister chromatid during mitosis.

The term "independent assortment" describes how different genes or alleles sort into newly formed gametes. Chromosomes are independently divided into different gametes, leading to this independent assortment. Be aware that during crossing over, genes on each chromosome are rearranged.

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The first compound is achiral and the second compound is chiral.

A molecule is referred to as achiral if it has a plane of symmetry or a center of symmetry. A molecule is referred to as chiral if it lacks a plane of symmetry or a center of symmetry. As compound 1 possesses a plane of symmetry due to the presence of both OH groups at equatorial positions (they are on the same side of the cyclohexane ring) so it is achiral. In structure, both OH groups are on the opposing side of the cyclohexane ring. There is neither a plane of symmetry nor a center of inversion. So, compound 2 is chiral.

The question is incomplete. The complete question is attached as an image.

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The number of times that it needs to decay is nine times.

The term nuclear decay has to do with the situation in which a radioactive nucleus is disintegrated in order to form daughter nuclei. We know that the daughter nuclei that is formed depends on the kind of decay that has taken place.

Now we know that the decay that is undergone by the the Americium-241 is the alpha decay in which the mass number is reduced by 4. The implication of this is that from Americium-241 to Thallium-205 we have a decrease in mass of 36 units which means that there have been nine alpha decays.

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If Kelp is absent from the aquatic environment, it will have a negative impact on all other living things because it cannot produce or absorb O2 or CO2.

How does photosynthesis work?

The process by which plants convert carbon dioxide, water, and sunshine into oxygen and sugar-based energy is known as photosynthesis.

Explanation:

The Protista kingdom of living things includes kelp, which can photosynthesize, or use light energy to create nourishment.

CO2 from the atmosphere is absorbed by photosynthesis, which then produces O2 as a gas.

As a producer of aquatic environments, kelp aids in the absorption of CO2 and the release of oxygen into the atmosphere. Other living things use this O2 for cellular respiration.

Other living things in the watery environment will suffer if kelp is not available to absorb CO2 or create O2.

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Bohr's work was primarily based on the emission spectra of hydrogen. This is also referred to as the planetary model of the atom. It explained the inner workings of the hydrogen atom. Hope this helps.

when a compound donates (loses) electrons, that compound becomes Oxidized. such a compound is often referred to as an electron donor.

when a compound accepts (gains) electrons, that compound becomes Reduced. such a compound is often referred to as an electron acceptor.

in glycolysis, the carbon-containing compound that functions as the electron donor is Glucose.

once the electron donor in glycolysis gives up its electrons, it is oxidized to a compound called Pyruvate

5. NAD⁺ is the compound that functions as the electron acceptor in glycolysis.

6. the reduced form of the electron acceptor in glycolysis is NADH

A substance is said to be oxidized when it loses electrons, loses hydrogen, or receives oxygen.

However, the opposite happens with reduction. In other words, when a substance gains electrons, gains hydrogen, or loses oxygen, it is said to be reduced.

A substance that itself is reduced to oxidize another substance is called an oxidizing agent. Redox reactions occur simultaneously. That is, when one substance is oxidized, only another substance is reduced.

During glycolysis, the six-carbon compound glucose (C6H12O6) loses electrons and is finally converted to a three-carbon compound known as pyruvate (CH3COCOOH). In this process, an oxidant called NAD+ receives electrons and is itself reduced to NADH.

The chemical formula for glucose is C6H12O6, while the chemical formula for pyruvate is CH3COCOOH. Looking at their chemical formulas, it is easy to see that glucose has lost hydrogen compared to pyruvate. That means that glucose has been oxidized. Glucose has 12 hydrogens for 6 carbons, but pyruvate has only 4 hydrogens for 3 carbons. This means that glucose was oxidized in the process because the molecule produced, pyruvate, has relatively few hydrogens.

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Cold packs release cold is not an endothermic reaction as it absorbs heat from the surroundings.

Endothermic reaction is a reaction that absorbs heat from the surrounding to form a product .the entropy of the surrounding decreases.in endothermic reaction enthalpy change is positive.since hot packs release heat it involves endothermic reaction.it is a type of enterogenic reaction.it involves decrease in temperature as it absorb heat  from the enviroment.it stores energy in the form of reaction.bond breaking requires energy while bond making release energy.Enthalpy change is the amount of energy absorbed in a reaction carried out at a constant pressure.Entropy is the measure of the disorder of the system.this explains hotpack release hot is a endothermic reaction and cold pack won't release cold.

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Answer:

Cold absorbs heat

Explanation:

Endothermic means accompanied by or requiring the absorption of heat, this view is not accurate because cold absorbs heat.

Following is the order of the reactions: R1 = 1, R2 = 2, and R3 = 0.

Resistance or antagonism to an energy, influence, or movement is a reactionary act, process, or occurrence. especially: a reaction to a particular treatment, circumstance, or stimulus; leaning toward a past and typically antiquated political or social system or policy.

Chemical reaction is the transformation of one or more substances—the reactants—into one or more additional substances—the products. Elements or chemical substances help compensate compounds. In a chemical process, the electrons that make it up the reagents are rearranged to create multiple products.cts.

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For liquids the following factors affect vapor pressure-

What exactly is vapor pressure?

The equilibrium pressure of a vapor above its liquid (or solid), or the pressure of the vapor created by the evaporation of a liquid (or solid) above a sample of the liquid (or solid) in a closed container, is the vapor pressure of a liquid.

The temperature and intermolecular interactions between molecules affect a liquid's vapor pressure, which changes.

Temperature: As a substance's temperature rises, its vapor pressure also does. However, the vapor pressure decreases as the temperature does.

Molecular types:

The kind of molecules that compose a solid or liquid determine its vapor pressure.

Surface Area: When a solid or liquid interacts with a gas, the vapor pressure is unaffected by the solid or liquid's surface area.

Hence, for liquids the vapor pressure is affected by -Intermolecular Force and Temperature

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Answer: A

Explanation: Components of an experiment:

Independent variable:

A manipulated variable, in an experiment or study, whose presence or degree incurs a change in the  dependent variable.

Dependent variable:

A variable which is being studied in the experiment and is supposed to change with respect to the independent variable.

Control variable:

Control variable includes the variables which are of no concern in the experiment and must be constant so that they do not interfere with the results of the experiment. Change in control variable might affect the results of an experiment.

In Anna's experiment, the independent variable is the atmospheric conditions. The dependent variable is cell phone reception that will change according to the atmospheric conditions. All other things related to the experiment are control variables like cellphone, location of the cell phone. Both of these must stay constant to collect the best data.

Hence, the best option is A.

Answer:

the answer is true

Explanation:

the reason why is because if you look at it a chemical in a repeating form os a compound so that means it is the same properties for food.

Answer:

True

Explanation:

Many different species eat grass, and rabbits can eat other plants besides grass. Foxes, in turn, can eat many types of animals and plants. Each of these living things can be a part of multiple food chains.

The electric field is turned off, the charged particle travels on a circular path whose radius is 4.36 cm. The charge-to-mass ratio of the particle 6.819*10⁵ c/kg

F=Fe+Fb=0

qvB=qE

v=E/b

Fr=Fb=qvB=mv²/R

qvb=mv²/R

v=qBR/m

v=E/B

q/m=E/RB²=6.819*10⁵ c/kg

Consequently, an atom can be either positive, negative, or neutral. After receiving an electron from another atom, the charged particle becomes negative. If an electron is removed from it, it becomes positively charged. Applications of charged particles are susceptible to electric field and magnetic field management of their motion and energy. According to this definition, a charged particle is a particle that has an electric charge. At the atomic level, an atom consists of a nucleus that the electrons orbit. Protons and neutrons combine to create the nucleus, which has a positive charge. Any charged atom or molecule is an ion. It has a charge because the atom or molecule's number of protons and electrons is not equal. Positivity can be added to an atom.

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The following is the order of metallic character from least metallic character to most metallic character:-

Beryllium → Magnesium → Calcium → Strontium → Barium

Metallic character refers to the level of reactivity of a metal. Metals tend to lose electrons in chemical reactions, as indicated by their low ionization energies.

Within a compound, metal atoms have relatively low attraction for electrons, as indicated by their low electronegativities.

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An element of group (II) loses two electrons in the process of a chemical combination. its ionic charge is + 2.

The group (II) element are the alkaline earth metals. metals have tendency to donate the electrons and form cation . the group (II) metal element have tendency to loose 2 electrons and for cation with ionic charge of +2. example :

beryllium atomic number is 4 . electronic configuration is 1s² 2s² it can loose and form Be⁺² , electronic configuration is  1s².

Thus, An element of group (II) loses two electrons in the process of a chemical combination. its ionic charge is + 2.

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At high temperature and low pressure conditions of temperature and pressure expect gases to obey the ideal-gas equation.

What is ideal gas equation?

Ideal gas equation is given as

[tex]PV=nRT[/tex]

In this equation, P stands for the ideal gas's pressure, V for the ideal gas' volume, n for the total amount of the ideal gas expressed in moles, R for the universal gas constant, and T for temperature.

Explanation:

As opposed to real gases, which do not adhere to the Gas Laws at all temperatures and pressures, ideal gases do.

Real gases only abide with the Gas Laws at very low pressures and high temperatures. Because of the large amount of free space between the gas molecules in these circumstances, the actual volume may be very small. Additionally, because to their great distance from one another, molecules cannot sense intermolecular forces under these circumstances. Because of this, intermolecular forces are likewise insignificant.

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Answer:it’s binary ionic

Explanation:

The pressure in a 17.0-L cylinder filled with 46.5 g of oxygen gas at a temperature of 320 K is 2.26 atm.

IDEAL GAS LAW:

The pressure of a given gas can be calculated by using the ideal gas law equation as follows:

PV = nRT

Where,

P = Pressure

V = Volume

n = Number of moles

R = Gas law constant (0.0821 molK/Latm)

T = Temperature

Given,

V = 17 L

T = 320 K

R (Gas constant) = 0.0821

According to this question, a 17.0- l cylinder filled with 46.5 g of oxygen gas at a temperature of 320 K.

The number of moles of the oxygen gas (O₂) = 46.9g ÷ 32g/mol = 1.46mol

∴ PV = nRT

P × 17 = 1.46 × 0.0821 × 320

⇒17P = 38.357

⇒P = 38.357 ÷ 17

⇒P = 2.26 atm

Therefore, the pressure in a 17.0-L cylinder filled with 46.5 g of oxygen gas at a temperature of 320 K is 2.26 atm.

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The both compounds are different because their percentage compositions are different.

In order to confirm  that weather both compounds are same or not we will check the mole ratio. If it is same the compounds will be same otherwise not..

Given that,

For compound 1,

Mass of hydrogen given as 15 g

Mass of oxygen given as120 g

Moles of hydrogen and oxygen are to be determined

Number of moles of hydrogen = 15 g/ 1g/mol = 15 mol

Number of moles of oxygen = 120 g/ 16 g/mol = 7.5 mol

Total no of moles = 22.5 mol

Percentage of hydrogen = 15 /22.5 × 100 = 66.7%

Percentage of oxygen = 7.5 / 22.5× 100 = 33.3%

For  the compound 2,

Mass of hydrogen is 2 g

Mass of oxygen is 32 g

Moles of hydrogen and oxygen = ?

No of moles of hydrogen = 2 g/ 1g/mol = 2 mol

No of moles of oxygen = 32 g/ 16 g/mol = 2 mol

Total number of moles = 4 mol

Percentage of hydrogen = 2 /4 × 100 = 50%

Percentage of oxygen = 2 / 4× 100 = 50%

So, the both compounds will be different having different percentage compositions.

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