Volume of HCl used 25.0mL 4 l
Initial burette reading 0.50mL
Final burette reading 25.60mL
Concentration of KOH 1.0M
the molarity
HCl solution
Calculate​

Answer:

wavy, a feel of water, smooth and costy

Explanation:

Answer:

I'm pretty sure the answer is C.

What causes the changes in the ice ages is when the earth's orbits tilts.

The ice ages are caused by changes in Earth's orbit and tilt, which affect the amount of solar radiation received by the planet. These changes alter the climate and trigger the growth and retreat of ice sheets.

We know that the changes in the climates is responsible for most of the changes that we can see in the universe as we have come to experience it today.

Thus the earth's orbits is what does control the changes in the ice ages.

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Answer:The troposphere is heated from the ground, so temperature decreases with altitude. Because warm air rises and cool air sinks, the troposphere is unstable. In the stratosphere, temperature increases with altitude. The stratosphere contains the ozone layer, which protects the planet from the Sun's harmful UV radiation.

Explanation:

Exothermic reactions only release thermal energy, raising the temperature of the immediate environment. The environment is cooled through an endothermic process that absorbs heat.

An exothermic process is one in which energy is given off as heat or light. In contrast to an endothermic process, which draws energy from its surroundings, an exothermic reaction transfers energy into the environment.

The most exothermic reaction is the burning of methane because it generates a significant quantity of heat.

Thus, Exothermic reactions only release thermal energy.

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Answer:

?

Explanation:

I'm very sorry I couldn't get you a answer, I haven't learned this in school.

At least not this stuff, my apologies!

Answer:

knock and announce rule, no-knock

Explanation:

Answer:

The answer is the last one only.

Explanation:

Light/sun gives energy and growth which makes the plants leaves/plant grow bigger.

Explanation:

Without the sun, plants wouldn't get the food that's needed to grow, reproduce and survive. plants need sunlight, water and carbon dioxide to live.

The mass of the precipitate, CrPO₄ formed when 45.5 mL of 0.300 M Na₃PO₄ react with 42.5mL of 0.200 M Cr(NO3)₃ is 1.25 g

We'll begin by calculating the number of mole of Na₃PO₄ and Cr(NO3)₃ present in the solution.

Molarity of Na₃PO₄ = 0.3 M

Volume = 45.5 mL = 45.5 / 1000 = 0.0455 L

Mole = Molarity × Volume

Mole of Na₃PO₄ = 0.3 × 0.0455

Molarity of Cr(NO3)₃  = 0.2 M

Volume = 42.5 mL = 42.5 / 1000 = 0.0425 L

Mole = Molarity × Volume

Mole of Cr(NO3)₃ = 0.2 × 0.0425

Next, we shall determine the limiting reactant.

Na₃PO₄(aq) + Cr(NO₃)₃(aq) —> CrPO₄(s) + 3NaNO₃(aq)

1 mole       :      1 mole

0.01365    :      0.0085 mole

Thus, Cr(NO₃)₃ is the limiting reactant.

Next, we shall determine the number of mole of CrPO₄ produced from the reaction.

From the balanced equation above,

1 mole of Cr(NO₃)₃ reacted to produce 1 mole of CrPO₄.

Therefore,

0.0085 mole of Cr(NO₃)₃ will also react to produce 0.0085 mole of CrPO₄.

Finally, we shall determine the mass of 0.0085 mole of CrPO₄.

Mole of CrPO₄ = 0.0085 mole

Molar mass of CrPO₄ = 52 + 31 + (16×4)

= 52 + 31 + 64

= 147 g/mol

Mass = mole × molar mass

Mass of CrPO₄ = 0.0085 × 147

Therefore, the mass of the precipitate, CrPO₄ formed is 1.25 g

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The enthalpy change of reaction A is  -100 kJ/mol while its activation energy is 150  kJ/mol. The enthalpy for reaction B is 25kJ/mol while the activation energy  is 100 kJ/mol.

The term enthalpy change has to do with the difference between the energy of the products and that of the reactants. We know enthalpy to be a state function so it depends on the initial and the final states of the system as it were.

The activation energy is the energy that must be possessed by the reactants as they are converted into products. It is the energy barrier that stands in between the reactants and the products in a reaction.

For reaction A;

Enthalpy = Energy of products -- Energy of reactants

= 25 kJ/mol - 125 kJ/mol = -100 kJ/mol

The activation energy is 150  kJ/mol

For reaction B;

Enthalpy = Energy of products -- Energy of reactants

= 50 kJ/mol - 25 kJ/mol = 25kJ/mol

The activation energy is 100 kJ/mol

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The student needs to add approximately 83.3 mL of 12 M HCl solution to the existing 1 L of 2 M HCl solution to increase the concentration to 3 M. It is important to handle concentrated acids with caution and follow proper safety procedures.

To increase the concentration of a 1 L solution of 2 M HCl to 3 M, the student needs to calculate the volume of concentrated HCl needed and add it to the existing solution. Here's how the calculation can be done:

Given:

Initial concentration of HCl solution = 2 M

Final concentration desired = 3 M

Initial volume of HCl solution = 1 L

Step 1: Calculate the moles of HCl in the initial solution.

Moles of HCl = Initial concentration × Initial volume = 2 M × 1 L = 2 moles

Step 2: Calculate the moles of HCl needed for the desired concentration.

Moles of HCl needed = Final concentration × Final volume = 3 M × 1 L = 3 moles

Step 3: Calculate the moles of HCl to be added.

Moles of HCl to be added = Moles needed - Moles present = 3 moles - 2 moles = 1 mole

Step 4: Convert the moles of HCl to the required volume of concentrated HCl.

To calculate the volume, we need to know the concentration of the concentrated HCl solution. Assuming it is 12 M, we can use the following formula:

Volume of concentrated HCl = Moles of HCl to be added / Concentration of concentrated HCl

Volume of concentrated HCl = 1 mole / 12 M = 0.0833 L or 83.3 mL

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The correct valid reason of noncovalent bonds important to function of biomolecules is A).The effect of these weak interactions is cumulative. So,correct option is A.

A noncovalent bond is a kind of synthetic bond, regularly between macromolecules, that doesn't include the sharing of sets of electrons, yet rather includes more scattered varieties of electromagnetic communications. The noncovalent bond is the predominant kind of connection between supermolecules in supermolecular chemistry.[1] Noncovalent bonds are basic in keeping up with the three-layered construction of huge atoms, like proteins and nucleic acids, and are associated with numerous natural cycles where enormous particles dilemma explicitly however fleetingly to each other.

The energy delivered in the development of noncovalent securities is on the request for 1-5 kcal per mol.[2] There are four primary kinds of non-covalent securities: hydrogen holding, ionic collaborations, Van der Waals communications, and hydrophobic bonds.[2] Instances of noncovalent securities include: those limiting connections which hold the two strands DNA in the DNA twofold helix together, those which overlap polypeptides into such optional designs as the alpha helix and the beta conformity, those which empower compounds to tie to their substrate, and those which empower antibodies to tie to their antigen.

Hence,correct option is A.

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The energy of an electron in the n=3 energy state of a hydrogen atom is 2.42 x 10 to the power of 19 J

Answer:

A. The balanced chemical equations of the given reactions are shown below:

1. 3Mg(OH)₂ + 2H₃AsO₄ → Mg₃(AsO₄)₂ + 6H₂O

2. NH₄NO₃ → N₂O + 2H₂O

3. AsCl₃ + 3H₂O → H₃AsO₃ + 3HCl

4. 2C₄H₁₀O₂ + 11O₂ → 8CO₂ + 10H₂O

B. Number of moles of Cl₂ needed to react with 3.44 moles of F₂ = 1.14 moles

C. mass of ClF₃ produced = 0.136 * 92.5 = 12.58 g

D. 130.0 g of Cl₂ will produce (130 * 92.5)/71 g of ClF₃ = 169.37 g of ClF₃

Explanation:

A balanced chemical equation occurs when the number of the atoms involved in the reactants side is equal to the number of atoms in the products side.This in accordance with the law of conservation of mass which explains that when a chemical reaction occurs, the mass of the products should be equal to the mass of the reactants.

The balanced chemical equations of the given reactions are shown below:

1. 3Mg(OH)₂ + 2H₃AsO₄ → Mg₃(AsO₄)₂ + 6H₂O

2. NH₄NO₃ → N₂O + 2H₂O

3. AsCl₃ + 3H₂O → H₃AsO₃ + 3HCl

4. 2C₄H₁₀O₂ + 11O₂ → 8CO₂ + 10H₂O

B. The balanced equation of the reaction is: Cl₂ + 3F₂  → 2ClF₃

From the equation above, I mole of Cl₂ reacts with 3 moles of F₂

Number of moles of Cl₂ needed to react with 3.44 moles of F₂ will be = 1 * 3.44/3 = 1.14 moles

C. From the equation above,  3 moles of F₂ reacts to produce 2 moles of ClF₃

0.204 moles of F₂ will produce (2 * 0.204)/3 of ClF₃ = 0.136 moles of ClF₃

Molar mass of ClF₃ = 35.5 + 3 * 19 = 92.5 g/mol

mass of ClF₃ produced = number of moles * molar mass

mass of ClF₃ produced = 0.136 * 92.5 = 12.58 g

D. From the equation of reaction, 1 mole of Cl₂ produces 2 moles of ClF₃

molar mass of Cl₂ = 71 g/mol

71 g of Cl₂ produces 2 * 92.5 g of ClF₃

130.0 g of Cl₂ will produce (130 * 92.5)/71 g of ClF₃ = 169.37 g of ClF₃

Answer:

1. Some combination of ions form a solid precipitate because it is not favorable for the ions to become solvated (dissolved). Large and lowly charged ions tend to form precipitates, especially metals such as lead, barium, and silver.

2.
a. Pb(NO3)2 + 2KI -> 2KNO3 + PbI2

b. PbI2 is a precipitate because no other combinations of cations and anions will make an insoluble compound. KI, KNO3, and Pb(NO3)2 are all soluble.

c.

\(Pb^{2+}(aq) + 2NO_3^{-}(aq) + 2K^+(aq) + 2I^-{aq} = > PbI_2(s) + 2NO_3^{-}(aq) + 2K^+{(aq)}\\\\\)

is the ionic equation. Spectator ions are NO3- and K+

d.

\(Pb^{2+}(aq)+ 2I^-{aq} = > PbI_2(s) \\\)  is the net ionic equation

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Mescaline produces a wide range of psychoactive effects when ingested, including altered perception of reality, hallucinations, and euphoria. It is a powerful psychedelic drug that has been used for centuries by Native American tribes in spiritual ceremonies

Mescaline is a hallucinogenic alkaloid that is derived from the Peyote cactus. Mescaline is a complex organic molecule that can be synthesized in the laboratory from 3,4,5-trimethoxybenzyl bromide in two steps.The first step involves nucleophilic substitution using sodium cyanide, and the second step is a reduction using lithium aluminum hydride (LAH).Here's how mescaline can be synthesized from 3,4,5-trimethoxybenzyl bromide:Step 1: Nucleophilic substitution using sodium cyanideThe reaction of 3,4,5-trimethoxybenzyl bromide with sodium cyanide results in the formation of the nitrile derivative. NaCN serves as the nucleophile in this reaction, and it replaces the bromide ion.The mechanism for this reaction involves the following steps: A nucleophilic attack by the cyanide ion on the benzyl bromide. The carbon-bromine bond breaks, and the benzyl cation is formed. A second nucleophilic attack by the cyanide ion occurs on the benzyl cation, resulting in the formation of the nitrile derivative.Here's the reaction equation for this step:Step 2: Reduction using lithium aluminum hydrideThe next step is the reduction of the nitrile derivative using LAH. LAH serves as a strong reducing agent in this reaction and reduces the nitrile derivative to the amine. The mechanism for this reaction involves the following steps: A nucleophilic attack by LAH on the nitrile derivative. This results in the formation of an imine intermediate. The imine intermediate reacts with another LAH molecule, resulting in the formation of the amine.Here's the reaction equation for this step:Mescaline structure: Mescaline is a psychoactive compound that belongs to the phenethylamine class of alkaloids. The structure of mescaline is as follows: The molecule has three methoxy groups attached to the benzene ring, and it has an amine functional group. The molecule is a white crystalline powder that is soluble in water and alcohol.

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Answer:

0.399

Explanation:

Sig Fig rules

Answer:

No

Explanation:

Rust is an iron oxide, a usually reddish-brown oxide formed by the reaction of iron and oxygen in the catalytic presence of water or air moisture.

Answer:

Explanation:

Sodium oxide is an inorganic compound that has sodium and oxygen as its constituent

Majorly, its applications include in the ceramic industry and also aerounautical applications (for making light weight parts of air crafts)

So what exact properties of this oxide conform these properties?

The property here is that it is insoluble in water and other aqueous solutions

Furthermore, due to its ionic conductivity property, it finds use in applications like in the making of fuel cells.

According to the specific heat capacity, 37752.33 J  of energy is required to lower temperature of water.

Specific heat capacity is defined as the amount of energy required to raise the temperature of one gram of substance by one degree Celsius. It has units of calories or joules per gram per degree Celsius.

It varies with temperature and is different for each state of matter. Water in the liquid form has the highest specific heat capacity among all common substances .Specific heat capacity of a substance is infinite as it undergoes phase transition ,it is highest for gases and can rise if the gas is allowed to expand.

It is given by the formula ,

Q=mcΔT

It is calculated as, Q=32.45×4.2×277=37752.33 J.

Thus, 37752.33 J of energy is required to lower temperature of water.

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The pH at halfway to the equivalence point is 2.31.

The reaction between ammonia and hydrochloric acid is; NH₃ + HCl → NH₄Cl

At halfway to the equivalence point, 30 ml of the HCl solution has been added. This means that 30/40 = 0.75 of the ammonia has reacted, leaving 0.25 of the ammonia and all of the ammonium chloride in the solution.

To calculate the pH at this point, we need to consider the equilibrium between ammonia and ammonium ions; NH₃ + H₂O ↔ NH₄⁺ + OH⁻

The equilibrium constant for this reaction is Kb = [NH₄⁺][OH⁻]/[NH₃]. At equilibrium, the concentrations of NH₄⁺ and OH⁻ are equal, so we can write Kb = [NH₃]/[NH₄⁺].

At halfway to the equivalence point, the concentration of NH₃ is 0.15 M x 0.25 = 0.0375 M, and the concentration of NH₄⁺ is also 0.0375 M (since the solution is halfway to the equivalence point). Therefore, Kb = 0.0375²/[NH₃] = 1.76 x 10⁻⁵.

Since Kb and Kw are related by the equation Kb x Kw = Ka, we can calculate Ka as: Ka = Kb x Kw

= 1.76 x 10⁻⁵ x 1 x 10⁻¹⁴

= 1.76 x 10⁻¹⁹

Now we can use the expression for the ion product of water to find the concentration of hydroxide ions:

Kw = [H⁺][OH⁻] = 1 x 10⁻¹⁴

[OH⁻] = Kw/[H⁺] = 1 x 10⁻¹⁴/[H⁺]

Since the concentration of ammonium ions is equal to the concentration of hydroxide ions at halfway to the equivalence point, we can write:

[NH₄⁺] = [OH⁻] = 1 x 10⁻¹⁴/[H⁺]

Using the equilibrium constant expression for the ionization of water, we can substitute [OH⁻] and [NH₄⁺] in terms of [H⁺]:

Ka = [NH₃][H⁺]/[NH₄⁺]

1.76 x 10⁻¹⁹ = 0.0375 x [H⁺]/(1 x 10⁻¹⁴/[H⁺])

[H⁺]² = 2.36 x 10⁻⁶

[H⁺] = 4.86 x 10⁻³ M

Finally, we can calculate the pH:

pH = -log[H⁺] = -log(4.86 x 10⁻³)

= 2.31

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--The given question is incomplete, the complete question is

"40ml of 0.15 molar solution of ammonia titrated with 0.15 molar of HCl. what's the pH if halfway to the equivalence point, 30ml of strong titrant is added."--

Answer:

There should be one lithium, not two.

Explanation:

Lithium reacts with hydrogen at about 750°C to yield lithium hydride (LiH). LiH is white and powdery in appearance. It releases hydrogen gas when it reacts with water.

The correct formula for Lithium hydride is LiH and not Li2H because both lithium and hydrogen are univalent. Lithium has a valency of +1 while hydrogen has a valency of -1 in lithium hydride. Hydrides are formed between hydrogen and highly electro positive metals. In hydrides, hydrogen is forced to accept an electron from the highly electro positive metal.

1. The IUPAC name of N is nitrogen.

2. Nitrogen dioxide

3.The IUPAC name of O is oxygen

4.The IUPAC name of OH is hydroxyl.

The IUPAC name of ·0 is a radical. It is commonly found in organic chemistry and plays an important role in many reactions.

IUPAC names for the given compounds are:1.1. N: Nitrogen

The IUPAC name of N is nitrogen.

It is a non-metal and belongs to group 15 in the periodic table. It has an electronic configuration of 1s2 2s2 2p3.1.2. NO2: Nitrogen dioxide

Explanation: NO2 is a chemical compound that is formed by the combination of nitrogen and oxygen. It is a reddish-brown gas that has a pungent odor.

The IUPAC name of NO2 is nitrogen dioxide.1.3. O: Oxygen

Explanation: The IUPAC name of O is oxygen.

It is a non-metal and belongs to group 16 in the periodic table. It has an electronic configuration of 1s2 2s2 2p4.

X: UnknownExplanation: No IUPAC name can be given to an unknown compound as the structure and composition are not known.

Y: Hydroxyl Explanation: The IUPAC name of OH is hydroxyl.

It is a functional group that is composed of an oxygen atom and a hydrogen atom (-OH). It is commonly found in alcohols and phenols. ·0: RadicalExplanation: A radical is a molecule or an ion that contains an unpaired electron.

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Note: The complete question is given below

Provide the IUPAC names for the following compounds:

\(CH_3CH_2CH(CH_3)CH_2CH_2CH_2CH_3\)

C6H5CH(CH3)2

H2NCH2CH2CH2CH2CH2NH2

CH3CH2CH2CH2CH2OH

CH3CH2CH2CHOHCH3

Answer:

0.343

Explanation:

Step 1: Given data

Step 2: Calculate the partial pressure of Kr

The total pressure of the mixture is equal to the sum of the partial pressures of the individual gases.

P = pXe + pAr + pKr

pKr = P - pXe - pAr

pKr = 6.70 atm - 1.60 atm - 2.80 atm

pKr = 2.30 atm

Step 3: Calculate the mole fraction of Kr

We will use the following expression.

X(Kr) = pKr/P

X(Kr) = 2.30 atm/6.70 atm

X(Kr) = 0.343

Considering the Dalton's partial pressure, the mole fraction of Kr is 0.34.

The pressure exerted by a particular gas in a mixture is known as its partial pressure.

So, Dalton's law states that the total pressure of a gas mixture is equal to the sum of the pressures that each gas would exert if it were alone:

\(P_{T} =P_{1} +P_{2} +...+P_{n}\) where n is the number of gases.

This relationship is due to the assumption that there are no attractive forces between the gases.

Dalton's partial pressure law can also be expressed in terms of the mole fraction of the gas in the mixture.

So in a mixture of two or more gases, the partial pressure of gas A can be expressed as:

\(P_{A} =x_{A} P_{T}\)

In this case, you know:

So, replacing in the Dalton's partial pressure law:

\(P_{T} =P_{Xe} +P_{Ar} +P_{Kr}\)

6.70 atm= 1.60 atm + 2.80 atm + \(P_{Kr}\)

6.70 atm- 1.60 atm- 2.80 atm= \(P_{Kr}\)

2.30 atm=\(P_{Kr}\)

Then: \(P_{Kr} =x_{Kr} P_{T}\)

2.30 atm= \(x_{Kr}\) 6.70 atm

\(x_{Kr}\) =2.30 atm ÷6.70 atm

\(x_{Kr}\) = 0.34  

In summary, the mole fraction of Kr is 0.34.

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The structure of  the alkyne 4 - decyne is shown in the image attached.

Alkyne functional group compounds with a triple bond made of carbon and carbon contain 4-decyne (C). The triple bond is found at the fourth carbon position in the ten-carbon chain (decyne) of 4-decyne.

Nine hydrogen atoms (H) are joined to the first nine carbon atoms (C), starting from the left side.

In conclusion, 4-decyne is made up of a chain of ten carbon atoms, with the fourth carbon atom serving as the center of a carbon-carbon triple bond (C). Except for the carbon involved in the triple bond, all carbon atoms are connected to hydrogen atoms.

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Answer: The answer is Iceberg

Answer:

Is it an iceberg?

Explanation:

it floats in water

and you can only see the tip of an iceberg

Hope this helps! :)

Have a great weekend!!

Answer:

i think its f because my teacher have been talking about this

Explanation:

Answer:

f

Explanation: