student added 2 ml 2 ml of 0.1 m c a c l 2 0.1 m cacl2 to 2 ml 2 ml of 0.1 m n a 2 c o 3 0.1 m na2co3 in a test tube. he observed a white precipitate form. which of the following is the identity of the precipitate?

The root mean square (rms) value for Ne gas at 298k is 606.954 m/s.

Root mean square (RMS) speed of a gas is given by,

[tex]V_{rms}[/tex]=[tex]\sqrt{3KbT/m}[/tex]

where Kb = 1.38*10^-23 JK^-1 is the boltzmann constant.

T=Temperature in kelvin

m=mass of one molecule or an atom of the gas (in Kg)

We can also write the above expression as,

   [tex]V_{rms}[/tex]=[tex]\sqrt{3RT/Mm}[/tex] where, Mm/m=R/Kb

where, R=8.314 JK^-1 Mol^-1 is the universal gas constant.

Mm= molar mass of the gas in Kg

for the neon(Ne) gas, Mm=20.2g/mol=20.2*10^-3 kg/mol

T=298k

putting all the values in the above equation, we get

[tex]V_{rms}[/tex]=[tex]\sqrt{3(8.314 Jmol^-1 K^-1)*298K/20.2*10^-3Kmol^-1}[/tex]

      =[tex]\sqrt{367.956*10^3 m^2s^-2}[/tex]         ( Since, 1J=1kg m^2/s^2)

      =606.954 m/s

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Vaporization totally overcomes intermolecular attractions. Water has an enthalpy of vaporization (energy required to boil) of 40.7 kJ/mol.

A is the ideal answer.

Which of the following best exemplifies how the positive value of H° for CaF2 dissolving in water is explained? In the crystal lattice, Ca2+ ions and F- ions have very potent ion-ion interactions.

Due of its greater effective nuclear charge, Ar. The atomic radius and initial ionization energy of several elements are displayed in the table above.

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Consider one mole of CaCl₂ is given. The molar mass of CaCl₂ is 111 g/mol and mass of Ca is 40 g/mol. Thus, percent composition of Ca is 36.03 %.

Percent composition of an element in a compound is the ratio of its mass in the compound to the total mass of the compound multiplied by 100.

Consider one mole of CaCl₂ is given. Atomic mass of Ca = 40 g/mol

atomic mass of Cl = 35.5 g/mol

2 moles of Cl = 35.5 × 2 = 71 g.

molar mass of CaCl₂ = 71 g + 40 g = 111 g/mol

The percent composition of Ca in one mole of CaCl₂ is:

= 40 g/ 111 g × 100

= 36.03%.

Therefore, the percent composition of Ca in one mole of CaCl₂ is 36.03 %.

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Answer: Kinetic energy is highest when the velocity is the highest.

Explanation:

45.1KJ is  the enthalpy of the given reaction.

The formation reaction of CO,NH3,HCN,H2O are-

Thus to attain the given equilibrium we reverse the equation 1 and 2 the add with 3 and 4. So ΔH of total reaction is 45.1KJ.

What is standard enthalpy of reaction?

The enthalpy change that takes place when 1 mole of a substance is created from its component elements in their standard states is known as the standard enthalpy of formation. A pure element has a standard enthalpy of production of 0 in its normal state.

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The name of the ionic compound is Copper(II) fluoride and its chemical formula is CuF₂.

Ionic compound

The compound which is formed when electron gets transferred from one atom to another atom is known as ionic compound. Ionic compounds are formed usually when a metal reacts with a non-metal.

The nomenclature for writing the formula of an ionic compound is given as:

1. The name of the positive ion is written first.

2. The name of the negative ion is written next and a suffix is added at the end of the negative ion. The suffix written at the end is '-ide'.

3. In case of transition metals, the oxidation states of the transition metals are written in roman numerals in bracket in-front of the positive ions.

CuF₂ is an ionic compound because the element copper is a metal and the element fluorine is a non-metal. The bond that is formed between a metal and a non-metal is always ionic in nature.

The oxidation state of copper in CuF₂ is, (+2)

Thus, the name of ionic compound is, Copper(II) fluoride and its chemical formula is CuF₂.

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The mass (in grams) of (NH₄)₂Ce(NO₃)₆ needed, given that the concentration of the solution is 11 g/L, is 0.55 g

The concentration of a solution in grams per liter is defined as follow:

Concentration = mass / volume

Using the above formula, we can calculate the mass of (NH₄)₂Ce(NO₃)₆ needed to prepare the solution. This is illustrated below:

Concentration = mass / volume

11 = mass / 0.05

Cross multiply

Mass = 11 × 0.05

Mass = 0.55 g

Thus, the mass of (NH₄)₂Ce(NO₃)₆ needed is 0.55 g

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The masses that we need for the reaction are 261.6 g Zn; 630 g [tex]HNO_{3}[/tex]

We know that the place to begin when we are talking about a reaction is to be able to put down the equation of the reaction and this would help us so as to find what we are looking for.

In this case, the equation of the reaction can now be written as;

[tex]Zn (s)+ 2HNO_{3} (aq) ---- > Zn(NO_{3} )_{2} (aq) + H_{2} (g)[/tex].

Using the relation;

Number of moles = mass/molar mass

=  261.6 g/65 g/mol

4 moles

Number of moles of nitric acid = 630 g/63 g/mol

= 10 moles

Thus, we can see from the stoichiometry of the reaction that has been shown in the equation here that we need 261.6 g Zn; 630 g [tex]HNO_{3}[/tex] so as to obtain the required 00 g of ammonium nitrate as it is in the question that we have above.

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Molarity of the original calcium hydroxide solution = (16.5 ml x 3.04 m KOH) / 32.8 ml = 0.95 m

Step 1: Calculate the moles of perchloric acid in the original solution:

Moles of perchloric acid = (1.41 m)(51.8 ml) = 72.3 moles

Step 2: Calculate the moles of calcium hydroxide in the original solution:

Moles of calcium hydroxide = (32.8 ml)(1 M) = 32.8 moles

Step 3: Calculate the moles of potassium hydroxide needed to reach neutrality:

Moles of potassium hydroxide = (16.5 ml)(3.04 M) = 49.76 moles

Step 4: Calculate the moles of calcium hydroxide in the solution after the addition of the potassium hydroxide:

Moles of calcium hydroxide = 32.8 moles + 49.76 moles = 82.56 moles

Step 5: Calculate the molarity of the calcium hydroxide in the original solution:

Molarity of calcium hydroxide = (82.56 moles)/(32.8 ml) = 2.52 M

Molarity is a measure of the concentration of a solute in a solution. It is expressed as the number of moles of solute per liter of solution (mol/L). It is used to calculate the amount of a solute that must be added to a solution to achieve a desired concentration. It is also used to measure the amount of a substance in a given volume of solution. Molarity is a key concept in chemistry, and is important to understand when discussing the behavior of solutions and the reactions they undergo.

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Answer: 13.175

Explanation:

[tex]\text{Molarity}=\frac{\text{moles of solute}}{\text{liters of solution}}[/tex]

To find the moles of solute, we begin by finding the formula mass of NaOH.

This means 527 grams of NaOH is equal to [tex]\frac{527}{40}=13.175[/tex] moles.

So, the molarity is [tex]\frac{13.175}{1}=13.175 \text{ M}[/tex]

O 9 x 10-6 m.The "Planck length," so named after Max Planck, is the shortest unit of length.It is equivalent to 1.6 x 10-35 meters, roughly.It is around 10–20 times smaller than a proton due to its extreme smallness.

One thousand times smaller than just a micrometer is a nanometer (nm).It is equivalent to one billionth of a meter, or 1/1,000,000,000 of a meter.When something is this small, neither your eyes nor a light microscope can see it.

Its metric units for length are millimeters (mm), centimeters (cm), metres (m), and kilometers (km), in that order (km).10 mm make up 1 cm, 100 centimeters make up 1 m, and 1000 m make up 1 km.All nations, with the exception of the United States, Liberia, and Myanmar, utilize metric units of length.

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Among the remaining possible stereoisomers for the following cycloalkane B and C are enantiomers and A and B are diastereomers.

Enantiomers are substances that have the same connections but different three-dimensional structures. One enantiomer cannot be placed on top of another because enantiomers are not identical to one another. The two opposite enantiomers are called mirror images.

Diastereomers, also known as diastereoisomers, are a subclass of stereoisomers in stereochemistry. Stereoisomers that are not identical mirror images are known as diastereomers. Therefore, they occur when two or more stereoisomers of a molecule do not mirror image each other and have distinct configurations at one or more equivalent stereocenters.

The complete question with structures is attached.

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The following correctly identify the main types of oxidizing agents used in organic oxidation reactions :

D) Reagents containing an oxygen-oxygen bond

E) Reagents containing an oxygen-metal bond

The oxidation reaction are the reaction is the removal of the hydrogen is called as the oxidation reaction . the increases in the oxidation number or we can say that the loss of the electron are called as the oxidation reaction. The removal of the oxygen is called as the reduction reaction . the decreases in the oxidation number or the gain of the electron is the reduction reaction.

Thus, the Reagents containing an oxygen-oxygen bond and Reagents containing an oxygen-metal bond are main types of the oxidizing agents used in oxidation reaction.

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The wavelength of a photon is 622nm and it is a red light.

The length of a waveform signal that is propagating in space or over a wire is measured by the separation between identical points (adjacent crests) in the adjacent cycles. This length is typically specified in meters (m), centimetres (cm), or millimetres (mm) in wireless systems (mm).

A discrete bundle (or quantum) of electromagnetic (or light) energy is referred to as a photon. Photons move at the speed of light (3 108 m/s) because they have no mass.

λ = v/f

where, f = frequency = 4.82 × [tex]10^{14} Hz[/tex]

v = speed of light = 3 × [tex]10 ^{8}[/tex] m/s

λ = 3 × [tex]10^{8}[/tex] / 4.82 × [tex]10^{14}[/tex]

λ = 6.22 × [tex]10^{-7}[/tex]

λ = 622 nm.

Hence, the wavelength of a photon is 622nm and it is red light.

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Answer:

36 grams of Calcium

Explanation:

In order to calculate the gram of calcium, divide the total number of Calcium atoms by Avogadro's number:

(2.17 x 10^25)/(6.02 x 10^23) =

2.17/6.02 * 10^25/10^23 =

2.17/6.02 * 10^25/10^23 =

0.36 * 10^(25-23) =

0.36 * 10^2 =

0.36 * 100 = 36 grams of Calcium

This chemical reaction demonstrates the conservation of mass. Balanced chemical equation is 2KNO₃ → 2KNO₂ + O₂

What is Law of Conservation of Mass?

A neutral atom or molecule can become electrically charged atoms by obtaining or losing a free electron, which is the According to the principle of mass conservation, neither chemical processes nor physical changes can create or destroy mass in a closed system. The mass of the products of a chemical reaction must be equal to the mass of the reactants in accordance with the law of conservation of mass.

That is to say, the mass of any one element at the start of a reaction will be equal to that element's mass at the conclusion of the reaction. The overall mass will remain constant over time in any closed system if we take into account all reactants and products in a chemical reaction.

2KNO₃ → 2KNO₂ + O₂

Now the given equation is balanced because there are equal number of atoms of potassium, nitrogen and oxygen are present on both side of equation.

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The sulfuric acid is the limiting reactant and the mass of the product obtained is 127.8 g.

We know that the term limiting reactant is the reactant that is present in the least amount. We can know this from the equation of the reaction. We know that the equation of the reaction is written as; [tex]Ca(s) + H_{2} SO_{4} (aq) ----- > CaSO_{4}(s) + H_{2} (g)[/tex].

Number of  moles of sulfuric acid = 92.0 grams /98 g/mol = 0.94 moles

Number of moles of calcium =  43.2 g/40 g/mol = 1.08 moles

Given that the reaction is 1:1, the limiting reactant is the sulfuric acid.

If 1 mole of sulfuric acid  reacts with  1 mole of calcium

0.94 moles of  sulfuric acid  reacts with 0.94 moles * 1 mole/1mole

= 0.94 moles of calcium sulfate

Mass of the calcium sulfate = 0.94 moles  * 136 g/mol

= 127.8 g

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1. Diethyl malonate, NaOC2H5, C2H5OH 2. NaOH, H2O 3. H3O+, heat :

The malonic is the method of the synthesis for preparing the carboxylic acid from the alkyl halides. the alkyl halide are also called as the haloalkanes. one or more alkyl hydrogen atom are replaced by the halogen such as : fluorine, chlorine, bromine, iodine from the alkane compound. the halogen substituted alkanes are called as alkyl halide.

Thus, the alkyl halide form the carboxylic acids by the method of the malonic ester synthesis. the image is attached with the structure of the compounds.

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The force needed to accelerate the Toyota Camry is 7,659 N.

The force needed to accelerate the Chevy Suburban is 11,297.6 N.

The force needed to accelerate the School bus is  83,720 N.

The force needed to accelerate the Semi Truck is 193,701.4 N.

Newton's second law of motion states that the force applied to an object is directly proportional to the product of mass and acceleration of the object.

Mathematically, Newton's second law of motion is given as;

F = ma

where;

The given parameters include

The force needed to accelerate each of the cars is calculated as follows;

F ( Toyota Camry ) =  ( 1665 kg ) x ( 4.6 m/s² ) = 7,659 N

F ( Chevy Suburban ) =  ( 2,456 kg ) x ( 4.6 m/s² ) = 11,297.6 N

F ( school bus ) =  ( 18,200 kg ) x ( 4.6 m/s² ) = 83,720 N

F ( Semi Truck ) =  ( 42,109 kg ) x ( 4.6 m/s² ) = 193,701.4 N

Thus, the force needed to accelerate each cars is a function of mass and acceleration of each of the cars.

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The complete question is below;

Using Newton’s 2nd Law (F = ma) complete the following table for different types of cars. mass of the Toyota Camry, is 1665 kg, the mass of Chevy Suburban, m = 2,456 kg, the mass of school bus 18,200 kg and the mass of semi truck, m = 42,108 kg

Water, ice, acids, salts, plants, animals, and temperature fluctuations are all mechanical weathering agents. Erosion is the process by which the broken pieces of rock and mineral are moved away after a rock has been cracked.

Rocks that have holes or are porous (have holes) experience freeze-thaw weathering (allows water to pass through). In this case, mechanical weathering is evident. Different fissures in the rock allow water to enter (from rain, melting snow, or ice).

Weathering that releases pressure. Definition. expansion associated with the release of confining pressure when deeply buried rock is unroofed, leading to the development of fractures near the surface of solid rock. Typically, fractures spread along surfaces parallel to and near the surface.

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The atom or molecule that contributes electrons—in this case, magnesium is known as the reducing agent because the reduction of another molecule is made possible by the electrons it donates.

a molecule that, during a redox reaction, takes or absorbs electrons from another molecule. In a redox reaction, an electron acceptor reduces itself and acts as an oxidizing agent. Oxygen, nitrate, iron (III), manganese (IV), sulfate, carbon dioxide, and other elements are examples of acceptors.

A chemical species that "donates" an electron to an electron recipient is referred to as a reducing agent in chemistry. This chemical species is also referred to as a reductant, reducer, or electron donor (called the oxidizing agent, oxidant, oxidizer, or electron acceptor).

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The heat of reaction per mole of BaCl₂ is 366 kJ/mol BaCl₂.

Reaction is a response, typically sudden, to a particular event, situation, or stimulus. It is a type of behavior that occurs as a result of an external force, such as an event, person, or object. Reactions can be physical, emotional, mental, or a combination of all three. Examples of physical reactions include facial expressions, muscle tension, and changes in heart rate and breathing.

The heat of this endothermic reaction can be calculated using the equation q=mc∆T,
where q is the heat,
m is the total mass of the solution,
c is the specific heat capacity of water, and
∆T is the change in temperature.
In this case, the total mass of the solution is 300 mL and the change in temperature is (45.0°C - 15.8°C) = 29.2°C.
The specific heat capacity of water is 4.18 J/g°C.
Therefore, the heat of the reaction is q = (300 mL)(4.18 J/g°C)(29.2°C) = 366 kJ.
Since the reaction is 1 mole of BaCl₂,
The heat of reaction per mole of BaCl₂ is 366 kJ/mol BaCl₂.

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Specific heat capacity of a substance is the amount of heat required to raise the temperature by one degree Celsius of one gram of a substance. Therefore,  the specific heat of the metal is 42.09J g ∘ C.

Enthalpy term is basically used in thermodynamics to show the overall energy that a matter have. Mathematically, Enthalpy is directly proportional to specific heat capacity of a substances. Internal energy is the sum of all kinds of energy that the particles of a matter can possess, for example translational energy. Rotational energy.

for metal                                                                for water

m×C×(final temperature - initial temperature)  =  m×C×(final temperature - initial temperature)

Substituting all the given values in the above equation, we get

32.4 g×C×( 24.8 °C- 96.3 °C) =  100.0 g×4.18×(24.8 °C- 17.6 °C)

-71.5×C= 3,009.6

C= 42.09J g ⋅ ∘ C

Therefore,  the specific heat of the metal is 42.09J g ∘ C.

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The technique that wildlife photography experts use to put the focus on their subjects in the middle ground is called Deep Focus.

A narrow aperture is typically used to produce deep focus. Because a camera's aperture regulates how much light enters the lens, obtaining deep focus necessitates a bright picture or a lengthy exposure. A wide-angle lens also sharpens a bigger section of the image.

Deep focus in cinematography maintains a tight focus on all parts of an image, catching crucial actions in both the front and background.

Deep focus is used by directors for situations with significant movement in both the front and background of the frame. This type of staging is known as "deep space" or "deep staging" by directors because it involves the placing of performers, props, and set elements at tremendous depth.

A filmmaker must be able to capture a well-defined image for such a shot to succeed. Such sharpness is possible with a deep-focus photo.

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Potassium hydroxide and cupric sulfate react 10 form a precipitate of cupric hydroxide, as well as dissolved potassium sulfate, the reaction is shown below:-

2CuSO4 + 4KI⟶ 2CuI + I2 + 2K2SO4

What is precipitate?

In  aqueous solutions, precipitation is the procedure of remodeling a solute from a supersaturated strategy to an insoluble stable. The stable that bureaucracy is referred to as a precipitate.

Therefore, Potassium hydroxide and cupric sulfate react 10 form a precipitate of cupric hydroxide, as well as dissolved potassium sulfate.

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The order of increasing boiling points for the compounds is;

[tex]He < C_{3} H_{8} < CH_{3} OH < OHCH_{2} OH < HCl[/tex]

We know that the boiling point of the substance would depend on the kind of intermolecular forces that is existing in the substances. We know that the methanol and the glycol both have strong hydrogen bonds that is occurring in the molecule thus they would have a higher boiling point.

On the other hand, the helium, and the propane compounds only have the dispersion forces thus they would not be expected to have a high boiling point in the sequence.

This implies that helium would have the least boiling point since it contains only dispersion forces and has a low relative molecular mass while hydrogen chloride which has strong hydrogen bonds would have the highest boiling point.

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The mass of HCl is:

0.75×36.5/1000 ×25=0.684g.

​

1 mole of calcium carbonate reacts with 2 moles of HCl.

Hence, the mass of calcium carbonate that will react completely with 0.684 g of HCl is

100/2×36.5 ×0.684=0.937g.

What is mole?

Mole, symbol Mole is a unit of quantity of matter in the International System of Units (SI). Amount of matter is a measure of how much a given elementary unit of matter is contained in an object or sample. A mole is defined to contain exactly 6.02214076 × 1023 base units. Depending on the substance in question, the basic entities can be subatomic particles such as atoms, molecules, ions, ion pairs, or electrons. For example, 10 moles of water (a compound) and 10 moles of mercury (a chemical element) contain the same amount of matter, and mercury contains exactly one atom per molecule of water, The two volumes and masses are different.

The number of base units in one mole is known as Avogadro's number and represents the approximate number of nucleons (protons or neutrons) in one gram of ordinary matter. The previous definition of mole was the number of elemental units equal to 12 grams of carbon-12, the most common isotope of carbon.

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The element is Oxygen and the atomic mass is 15.99 or we could say

16 amu.

The weight of one atom in a chemical element is its atomic mass, denoted by the symbol ma. Protons, neutrons, and electrons, three subatomic atomic particles with atomic masses, are involved.

A chemical element's atoms are the basic building blocks of matter. An atom's central nucleus, which is composed of all of them, is surrounded by one or more negatively charged electrons. The positively charged nucleus contains one or more of the relatively heavy protons and neutrons.

15.995 x 99.762/100 = 15.956

16.999 x 0.00038 = 0.00645962

17.999 x 0.002 = 0.035998

The atomic mass of element X = 15.956+0.00645962+0.035998

For a total of approximately 16 or 15.99, we add these.

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10-6mol dm-3 of H3O + ions are present in pure water.

Acid reacts with water to release H+ ions, which combine with water to create H3O ions since they cannot live alone. This decreases the concentration of ions (H3O/OH-) per unit volume.

pH=−log(1×10−8M)=8. Consequently, the solution's pH value is 8.

The pH falls in solution when [H3O+] concentration rises. As a result, the solution's acidity rises.

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