Select the common products for a typical combustion reaction of alcohols. Note: Partial credit will not be given to partial answers. You must select ALL the products. O strong base heat water carbon dioxide inorganic salt

Answer:

2.75 x 10^24 atoms

Explanation:

1 mole = 6.022 x 10^23 atoms

4.56 moles has:

4.56 x 6.022 x 10^23 = 2.75 x 10^24 atoms

To "fix" hydrogen means to convert it from its gaseous form (H₂) into a chemically usable form or compound.

Fritz Haber's method for fixing hydrogen, known as the Haber-Bosch process, involves combining hydrogen (H₂) with nitrogen (N₂) from the air to produce ammonia (NH₃) through a catalytic reaction. This ammonia can then be used to produce fertilizers, explosives, and other important chemicals.

Fritz Haber's method is considered the most important invention of the twentieth century because it revolutionized agriculture and food production. The production of ammonia-based fertilizers made it possible to significantly increase crop yields, addressing global food shortages and supporting a growing population.

This process had a profound impact on global agriculture and played a crucial role in the Green Revolution, which helped alleviate hunger and improved living standards worldwide.

Additionally, the Haber-Bosch process also enabled the production of synthetic materials, such as plastics and fibers, that have transformed various industries and contributed to technological advancements.

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Sodium hydroxide is a soluble strong base. The pOH of a 3.0 × 10⁻³ M-sodium hydroxide solution is 2.5.

According to Arrhenius, a base is a species that releases OH⁻ ions in an aqueous medium.

Let's consider the basic reaction of NaOH.

NaOH(s) ⇒ Na⁺(aq) + OH⁻(aq)

NaOH is a strong base. This means that the concentration of OH⁻ will be equal to the initial concentration of NaOH, i.e. 3.0 × 10⁻³ M.

Then, we can calculate the pOH of the NaOH solution using the following expression.

pOH = -log [OH⁻] = -log 3.0 × 10⁻³ = 2.5

Sodium hydroxide is a soluble strong base. The pOH of a 3.0 × 10⁻³ M-sodium hydroxide solution is 2.5.

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Answer:2.5

Explanation:

The appropriate conversion factor to use first when calculating the number of grams of FeCl3 produced by the reaction of 30.3 g of Fe with Cl2 is the stoichiometric ratio between Fe and FeCl3. The balanced chemical equation for the reaction is: 2 Fe + 3 Cl2 -> 2 FeCl3

This means that for every 2 moles of Fe reacted, 2 moles of FeCl3 are produced. Therefore, the conversion factor to use first would be the molar ratio of Fe to FeCl3, which is 2 moles of FeCl3 per 2 moles of Fe, or 1 mole of FeCl3 per 1 mole of Fe. This can be used to convert the given mass of Fe (30.3 g) to moles of Fe, which can then be used to calculate the moles of FeCl3 produced, and finally, the mass of FeCl3 produced.

To calculate the number of grams of FeCl3 produced by the reaction of 30.3 g of Fe with Cl2, you should first use the molar mass conversion factor. This will allow you to convert grams of Fe to moles of Fe, which can then be used to determine moles of FeCl3 produced using the stoichiometry of the balanced chemical equation. Finally, you can convert moles of FeCl3 to grams of FeCl3 using its molar mass.

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Answer:

Explanation:  Separation and Purification are two processes used in analytical chemistry, both are a method of separation. The main difference between separation and purification is that separation is the conversion of a mixture of substances into more than two or more products whereas purification is the removal of contaminants (any substance that makes something dirty or impure) in the analyte solution.

Answer:

Nonmetals tend to gain electrons and metals tend to lose electrons.

Explanation:

To produce 2,4-dimethylhexan-2-ol, the starting alkene required is 2,4-dimethylhex-2-ene. The reaction proceeds through an acid-catalyzed hydration process, resulting in the formation of 2,4-dimethylhexan-2-ol.

The synthesis of 2,4-dimethylhexan-2-ol involves the addition of water to an alkene, which is an example of an acid-catalyzed hydration reaction. In this case, the starting alkene is 2,4-dimethylhex-2-ene, which has a double bond between the second and third carbon atoms in the carbon chain.

The reaction is typically carried out in the presence of a catalyst, such as sulfuric acid (H2SO4). The sulfuric acid acts as a catalyst by providing protons (H+) to initiate the reaction. The protonation of the double bond in the alkene creates a carbocation intermediate.

Next, water (H2O) is added to the carbocation, resulting in the formation of an oxonium ion. The oxonium ion is then deprotonated, leading to the formation of the alcohol product, 2,4-dimethylhexan-2-ol. The presence of the two methyl groups in the product indicates the regioselectivity of the reaction, with the water molecule adding to the carbon atom that has fewer substituents.

Overall, the reaction of 2,4-dimethylhex-2-ene with H2O and an H2SO4 catalyst leads to the production of 2,4-dimethylhexan-2-ol through an acid-catalyzed hydration process.

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The empirical formula of the given compound is \(CH_{3}O\).

An organic compound comprising c, h, and o that weighs 0.952 g totally burns in oxygen to create 1.35 g of co2 and 0.826 g of water.

Moles of \(CO_{2}\) present = 1.35÷44= 0.03068 moles

Mass of Carbon present = 0.03068 moles \(\times\) 12 g/mol = 0.368 g

Similarly,

Mass of H present = 0.826 g \(\times\) (2/18.0512) = 0.0917 g

Now, the mass of Oxygen present = 0.952 - ( 0.368 + 0.0917) = 0.492 g

So, from the empirical table in the image,

The empirical formula for the compound is \(CH_{3}O\).

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Answer:

Both the assertion and reason are false

Explanation:

A buffer is a solution that resists changes in acidity and alkalinity. When a solution is buffered, it pH can only vary within a small range. A buffer is made up of a weak acid/base and its salt.

When a strong acid is added to a buffer solution, the conjugate base will react with the H+ from the strong acid to form the undissociated weak acid HA as follows; H+(aq) + A- (aq)→ HA(aq). Hence, H+ concentration decreases owing to its reaction with the A- thus the pH changes only slightly.

At the time when the strong acid should be added so here Both the assertion and reason are false

It is a solution that resists changes with respect to the acidity and alkalinity. When a solution should be buffered, it pH can only change within a small range. At the time when a strong acid should be added to a buffer solution, the conjugate base should be react with the H+ from the strong acid to form the undissociated weak acid.

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Approximately 222.4 grams of oxygen reacted in the combustion process. To determine the amount of oxygen that reacted, we can use the balanced chemical equation for the combustion of hydrogen:

2H₂ + O₂ → 2H₂O

From the equation, we can see that 1 mole of oxygen reacts with 2 moles of hydrogen to produce 2 moles of water.

First, we need to convert the given masses of hydrogen and water into moles using their molar masses:

Molar mass of hydrogen (H₂) = 2 g/mol

Molar mass of water (H₂O) = 18 g/mol

Mass of hydrogen in moles = 27.8 g / 2 g/mol = 13.9 mol

Mass of water in moles = 249 g / 18 g/mol = 13.8 mol

Since the stoichiometry of the reaction tells us that 2 moles of hydrogen react with 1 mole of oxygen, we can calculate the moles of oxygen consumed as:

Moles of oxygen consumed = 13.9 mol / 2 = 6.95 mol

Finally, we can convert the moles of oxygen to grams using its molar mass:

Molar mass of oxygen (O₂) = 32 g/mol

Mass of oxygen consumed = 6.95 mol × 32 g/mol = 222.4 g

Therefore, approximately 222.4 grams of oxygen reacted in the combustion process.

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Rs can be solved by rearranging the equation as Rs = Ms / (Cw.t).

Rs is the sampling rate of a chemical which can be derived from field measurements of chemical concentrations of spot water samples taken before, during, and after deployment or through laboratory calibration experiments. The equation to calculate the concentration of chemical in a water body (Cw) after an exposure time is given by Cw = Ms / Rs.t.

To solve for Rs, we need to rearrange the equation as follows:
Cw.t = Ms / Rs
Rs = Ms / (Cw.t)

Therefore, we can solve for Rs by dividing the mass of chemical on the sampler (Ms) by the product of concentration of chemical in the water body (Cw) and the exposure period (t). This rearranged equation can be used to calculate the sampling rate of a chemical in a water body in the field or in the laboratory calibration experiments.

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The difference between a coordinate covalent bond and a normal covalent bond is that in a coordinate covalent bond, one atom provides both of the electrons that are shared, while in a normal covalent bond.

A coordinate covalent bond (also known as a dative covalent bond) is a special type of covalent bond that is formed when both atoms in the bond contribute an equal number of electrons to the bond. This type of bond is formed when one atom donates both electrons in the bond to the other atom. This type of bond is different from a normal covalent bond because the electrons in a coordinate covalent bond come from one atom only. This type of bond is important in biological systems, as it allows for the formation of biologically relevant molecules, such as proteins and enzymes. Coordinate covalent bonds are also important in the formation of metal-ligand complexes, which play a key role in metal-based drug delivery systems.

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The Ksp of BaF2 is 1.50 x 10^-9.

To calculate the Ksp of barium fluoride (BaF2), we can use the molar solubility of BaF2 and the stoichiometry of its dissolution reaction:

BaF2(s) ⇌ Ba2+(aq) + 2F-(aq)

From the given information, we know that a saturated solution of BaF2 has a concentration of 1.39 grams per liter, or 0.0117 moles per liter (since the molar mass of BaF2 is 175.32 g/mol).

a. To find the molar solubility of BaF2, we can divide the concentration of Ba2+ ions in the saturated solution by the stoichiometric coefficient of BaF2:

molar solubility of BaF2 = [Ba2+] / 1

Since the solubility of BaF2 is given as 1.39 g/L, we need to convert this to moles per liter:

1.39 g/L / 175.32 g/mol = 0.00793 mol/L

Therefore, the molar solubility of BaF2 is 0.00793 M.

b. To find the Ksp of BaF2, we can use the molar solubility and the stoichiometry of its dissolution reaction:

Ksp = [Ba2+][F-]^2

From the balanced equation, we know that the concentration of F- ions is twice the concentration of BaF2:

[F-] = 2[BaF2]

Substituting this relationship into the Ksp expression gives:

Ksp = Ba2+^2 = 4[BaF2]^3

Plugging in the molar solubility we found in part (a), we get:

Ksp = 4(0.00793 M)^3 = 1.50 x 10^-9

Therefore, the Ksp of BaF2 is 1.50 x 10^-9.

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Answer: 71.76

Explanation:

Answer:

71.76

Explanation:

You plug them in the equation said there

Physical changes are the changes that happen merely because something's shape or form changes, but its chemical or internal makeup doesn't.

Chemical changes are those that take place when a substance's makeup changes and produces a new compound. These modifications are permanent. Chemical reactions result in these modifications.

Examples of chemical changes are combustion of fuel or wood: that oil or wood convert into energy, CO₂ and ash in case of wood.

Example of physical changes are Ice forming from water, turning water into gas, The water molecules in this substance don't change in composition or state; they just rearrange themselves.

Thus, Physical changes are the changes that happen merely because something's shape or form changes.

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Hydrogen chloride (HCl) and sodium bicarbonate (NaHCO3) are the reactants. The substances produced as a result of this reaction are CO2(g), H2O(l), and NaCl(aq).

The reactants in the following equation:

HCl (a q) + NaHCO3(a q) → CO2(g) + H2O(l) + Na C l (aq) are hydrogen chloride (HC l) and sodium bicarbonate (NaHCO3).

Explanation:

A reactant is a substance that undergoes change during a chemical reaction. A reaction equation includes the symbols and formulas of reactants and products, along with the physical states of the substances, as they appear before and after the reaction.

The chemical reaction in this question is: HC l(a q) + NaHCO3(a q) → CO2(g) + H2O(l) + Na Cl (a q)In this equation, the reactants are H Cl (a q) and NaHCO3(a q), which are in an aqueous state.

Therefore, hydrogen chloride (H Cl) and sodium bicarbonate (NaHCO3) are the reactants. The substances produced as a result of this reaction are CO2(g), H2O(l), and Na Cl (a q).

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\(C_3H_6\)  has a double bond in its carbon skeleton. This is a true statement.

Carbon skeleton refers to the chain of carbon atoms that make up an organic molecule. The presence or absence of double bonds in the carbon skeleton affects the properties of the molecule and how it interacts with other molecules. In \(C_3H_6\), there are three carbon atoms arranged in a linear chain, with each carbon atom forming single covalent bonds with two hydrogen atoms. The remaining valence electrons on each carbon atom form a double bond between the first and second carbon atoms.

This double bond is responsible for the unsaturated nature of the molecule. \(C_3H_6\)is an example of a simple alkene, also known as propene. Its carbon skeleton and double bond make it a versatile molecule that can be used in various applications, including the production of plastics, rubber, and other materials.

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The heat released by its complete combustion of 171 ml of acetone is -4304.5 Kcal.

Acetone is an organic compound with the system (CH₃)₂CO. it's miles the best and smallest ketone. it is a drab, particularly unstable and flammable liquid with a function smelly odor. Acetone is miscible with water and serves as a vital natural solvent in its personal proper, in industry, home, and laboratory.

Calculation:-

C3H6O(l)+ 4O2 (g) ---> 3CO2 (g) +3H2O (g), ΔHo of the reaction =-1790 kcal

  Volume acetone contained in the bottle =  177mL

  density = 0.788 g / mL

   ∴  mass of the substance present= 0.788 x 177

                                                        =139.476 g

     number of moles of acetone =mass / molar mass

                                               = 139.476 / 58

                                               =2.404

  One mole of acetone on combustion releases -1790Kcal of heat

   ∴  2.404 moles of  acetone releases  2.404 x ( -1790) = -4304.5 Kcal of heat.

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Answer:

Crust (the surface)

Upper Mantle (dense magma)

Lower Mantle (less dense magma)

Outer Core (pure liquid material)

Inner Core (dense material)

Hope that helps

Between the two strands of DNA, a hydrogen bond (H-bond) holds the nitrogen bases together.

What is a chemical bond?

An enduring attraction between atoms or ions known as a chemical bond is what allows molecules and crystals to form. The bond may be created by the sharing of electrons in covalent bonds or by the electrostatic attraction of two oppositely charged ions, as in ionic bonds.

The two nitrogenous bases are joined by two hydrogen bonds. One of the hydrogen bonds is created between the oxygen atom of the keto group at C-4 of thymine and one of the amino group's hydrogen atoms at C-6 of adenine. The adenine's nitrogen atom at position 1 and the hydrogen atom connected to N-3 form another bond. DNA's double helix structure depends on the hydrogen bonds between adenine and thymine. They can be broken at high temperatures because they are not particularly strong bonds.

Because the breakage of the two hydrogen bonds between A and T requires less energy than the breakage of the three hydrogen bonds between G and C at G-C rich sites, the beginning of DNA replication and transcription frequently occurs at A-T rich sites.

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Answer:

1

Explanation:

Formula of molarity is

\(M=\frac{n}{v}\)

M= molarity

n= no of moles

v= volume in liters (if mL then you have to convert it to L)

Answer:15.9994 g/mol

Explanation:

False. The addition of a solute to a solvent typically lowers the freezing point of the solution compared to the freezing point of the pure solvent.

This is due to the fact that the solute particles interfere with the arrangement of the solvent particles, which makes it more difficult for the solution to freeze. As a result, the solution has to be cooled to a lower temperature in order for it to freeze, which results in a lower freezing point compared to the pure solvent. Freezing point depression is a colligative property, which means that it depends on the concentration of solute particles in the solution, rather than on their chemical nature. When a non volatile  solute (a solute that does not evaporate at room temperature) is dissolved in a solvent, it increases the number of solute particles in the solution. These solute particles interfere with the arrangement of the solvent particles, making it more difficult for the solvent to freeze. As a result, the solution has to be cooled to a lower temperature in order for it to freeze, which results in a lower freezing point compared to the pure solvent. To summarize, the addition of a non volatile solute to a solvent typically lowers the freezing point of the solution, and therefore the statement "The freezing point of the solution is unchanged by the addition of the solvent" is false.

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The concentration of nitrogen 2 mm from the surface after 25 hours is approximately 0.0198 wt%.

To find the concentration of nitrogen 2 mm from the surface after 25 hours, we can use Fick's second law of diffusion. The formula is given by:

C(x, t) = C0 * erfc((x / (2 * sqrt(D * t)))

Where:
C(x, t) is the concentration at a distance x from the surface at time t
C0 is the initial concentration at the surface
erfc is the complementary error function
D is the diffusion coefficient
x is the distance from the surface
t is the time

Given:
Initial concentration, C0 = 2 wt% = 0.02
Diffusion coefficient, D = 2.8 x 10^-11 m^2/s
Distance from the surface, x = 2 mm = 0.002 m
Time, t = 25 hours = 25 * 3600 seconds = 90000 seconds

Substituting these values into the formula:

C(0.002, 90000) = 0.02 * erfc((0.002 / (2 * sqrt(2.8 x 10^-11 * 90000))))

Evaluating this equation, we find that the concentration of nitrogen 2 mm from the surface after 25 hours is approximately 0.0198 wt%.

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The purpose of adjusting the vacuum in an Up in Smoke Lab is to control the pressure within a closed system, typically a distillation setup, in order to perform efficient separations of the components in a mixture based on their boiling points.

A vacuum pump is used to reduce the pressure in the system, allowing the components with lower boiling points to boil at lower temperatures, thereby facilitating their separation from those with higher boiling points. By controlling the vacuum, the lab can precisely adjust the conditions under which the separation takes place, leading to more accurate and reproducible results.

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In the balanced chemical reaction of MnO₂, the coefficient of H⁺ is 4.

Balanced chemical reaction

The chemical equations which have the same number and same type of each atom on both sides of the equation is known as balanced chemical equation. The coefficients in a balanced equation must be always the simplest whole number ratio. Mass is always conserved in chemical reactions i.e., neither destroyed nor created.

Balanced chemical reaction of MnO₂ is given as:

5MnO₂ + 4H⁺ → 3Mn₂ + 4H₂O + 2MnO₄⁻

Hence, the coefficient of H⁺ in the balanced chemical equation of reduction MnO₂ is 4.

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Polymerization reactions in which polysaccharides are synthesized from monosaccharides, Option E: result in the formation of water.

Polymerization reaction involves joining of monosaccharides together with the linkage of glycosidic bonds. The process of combining of these monosaccharides involve formation of water molecule as a byproduct of the process. This is called condensation reaction. Hence, option E is the correct choice.  

Polymerization is the process of producing polymers. These polymers are then processed to make a variety of plastic products. During polymerization, smaller molecules, or monomers, are chemically linked to create larger molecules, or macromolecules. Polysaccharides are produced when a glycol donor and a glycol acceptor undergo repeated polymerization reactions.  

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Answer:

its b alkyne

Explanation:

brinliest po plsss

Answer:

Alkyne so its b

Answer:

Ozone

Explanation:

The ozone layer protects the UV rays and also theres a hole in it near antarica which is causing global warming!

Off topic sorry lol:P

I hope this helps i got the answer correct

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