What is the volume in liters of hydrogen gas that would be produced by the reaction of 55.0 g of Al with excess HCl at STP according to the following reaction?
2 Al (s) + 6 HCl (aq) → 2 AlCl₃ (aq) + 3 H₂ (g)

The new concentration results in 0.512 M.

The concentration of a substance is the quantity of solute found in a given amount of solution. Concentrations are normally expressed in terms of molarity, defined because of the variety of moles of solute in 1 L of answer.

Calculation:-

final conc=m1v1+m2v2/(v1+v2)

final conc=209 × 0.71+407 ×0.41/(407+209)

final conc = 0.512 M

Concentration is the abundance of a constituent divided by way of the overall volume of an aggregate. several sorts of mathematical descriptions may be outstanding: mass concentration, molar concentration, variety concentration, and extent awareness.

The Concentration of an answer is a measure of the quantity of solute that has been dissolved in a given amount of solvent or answer. A concentrated answer is one that has a rather huge quantity of dissolved solute.

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The summary of the paragraph is that if you live on a high latitude there would be greater seasonal variation.

The equator is said to be that imaginary line that does divide the earth into the Northern and the southern Hemispheres. This implies that the equator is the line that divides the earth into to halves and the two haves of the earth are responsible for the variations in many things on earth such as the day and night experience.

We can see from the passage that if you are living in a position that is closer to the equator then it follows that the variation of day and night would have less difference as well as less of seasonal differences.

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Answer:

Water and CO2

Explanation:

These are both materials that are used in the process of photosynthesis that can be acquired from the around the plant, and the rain, which are natural raw materials that can be found anywhere in nature.

-Hope this helped

The empirical formula of the compound is CH3O

What is Combustion ?

Combustion is an exothermic, high-temperature redox chemical reaction between a fuel (reductant) and an oxidant (usually oxygen in the atmosphere), producing oxidized, often gaseous, gases in a mixture called smoke. A shaped product is produced. Combustion does not always lead to fire, as the flame is only visible when the substance undergoing combustion is vaporized, but when this occurs, the flame is a characteristic indicator of the reaction. Activation energy must be overcome to initiate combustion (for example, by starting a fire using a lit match), but the heat of the flame provides enough energy to make the reaction self-sustaining can provide.

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Work is entropy free and it does transfer entropy but the claim is not valid, the entropy of a fluid passing through an adiabatic steady state system with a single outlet and inlet can change due to irreversibilities present in the system during the process.

What is entropy?

Why doesn't entropy change when there is a work transfer?

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Copper(II) sulfate is pale blue (cyan) because it absorbs light in the red region of the spectrum.

Spectrophotometry is the branch of electromagnetic spectroscopy that deals with the quantitative measurement of reflectance or transmission properties of materials as a function of wavelength.

A method of measuring how much light a chemical absorbs by measuring the intensity of light as it passes through a sample solution. The basic principle behind spectrophotometry is that each compound absorbs or transmits light in a specific wavelength range.

Copper(II) sulfate solution appears blue because it actually absorbs red region of spectrum which is a complementary color of blue.

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Answer:

C.. Group I element they dissolve in water to form alkaline solution

B.. Element between group II and III and most of them form coloured compound

A... Group VII element they react with metals to form salts

Before the reaction of hydrogen peroxide, if a reagent had changed color immediately after being added to the sample, this would indicate the presence of a contaminant and the test would be invalid.

The above experiment is also knowns as a presumptive blood testing experiment in which if a contaminant is present, the test should be deemed invalid if a vivid blue or purple color appears after adding the TMB reagent but before adding the hydrogen peroxide; this is also frequently referred to as a "false positive" result.

Presumptive tests catalyze the oxidation of a chromogenic substance, which results in a color change, by reacting with the hemoglobin of all blood in humans and animals. If the test is positive, the material will be identified as potentially blood, though not necessarily human blood.

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Answer:

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What happens to electrons when an ionic bond forms?

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It is the prior distribution of electrons that constitutes the electrostatic force of interaction..

Explanation:

Commonly, ions are formed by (i) the loss of electrons from metals... electron rich materials from the left of the Periodic Tables as we face the Table, whose valence electrons are furthest removed from the positively charged nuclear core... and (ii) the gain of electrons by non-metals to the right of the Periodic Table as we face it.

We could represent these processes by the reaction...

M→M

n+

+ne

−

oxidation

X+e

−

→X

−

reduction

We add the two redox processes together in such a way that the electrons are eliminated as virtual particles and we get a neutral salt... of a material and a non-metal that are held together by a strong electrostatic force of attraction...

M+nX→MX

n

And thus the electrons are formally redistributed to give positive and negative ions that combine to form NEUTRAL SALTS.

Option C. Choice describes a couple of movement-reaction forces for the duration of the frenzy: The force of gravity on her body and the force of the wall on her feet.

Newton's laws of motion are 3 fundamental laws of classical mechanics that describe the connection between the motion of an object and the forces acting on it. those legal guidelines may be paraphrased as follows: A body stays at relaxation, or in movement at a steady speed in a straight line, unless acted upon through pressure.

Within the first regulation, an object will not alternate its motion unless pressure acts on it. inside the 2nd law, the force on an item is equal to its mass times its acceleration. inside the third law, when two objects interact, they practice forces on each other of identical value and opposite routes. Newton's 2nd regulation is one of the most important in all of physics. For a frame whose mass m is regular, it is able to be written inside the shape F = ma, in which F (pressure) and an (acceleration) are both vector quantities. If a body has a net force acting on it, its miles are multiplied in accordance with the equation.

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A heat shield is essentially a thermal barrier intended to keep things from overheating. The automotive industry to isolate the engine block to stop heat damage to the bodywork and internal parts.

A heat shield is essentially a thermal barrier intended to keep things from overheating. They are frequently employed in the automotive industry to separate the engine to stop heat damage to the bodywork and internal parts.

If the heat becomes too high, plastic engine parts may melt or deform, and belts may also become damaged. You should schedule a visit with your mechanic right away if you start to smell burning emanating from your car or discover that the engine hood is too hot to touch.

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At room temperature 15 grams of zinc will occupy 2.10 cm3

What is density of an element?

When atoms occupy a specific volume of space, their mass and number are measured by the periodic table's element densities. The quantity of mass in a particular volume, commonly expressed as grams per cm3 or g/cm3, is the density, which is a measurement of the number of particles in a certain volume of a substance.

Given the mass of zinc is 15 grams.

The density of zinc in room temperature is 7.14 g/cm^3

Density = mass/ volume

Volume =  mass / density

Volume = 15/ 7.14 = 2.10 cm3

Hence, at room temperature 15 grams of zinc will occupy 2.10 cm3.

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Answer:

reactivity, flammability,toxicity some more

The concentration of water in such a solution in mol/l is 0.0157 M.

Molar concentration is a measure of the concentration of a chemical species, particularly of a solute in an answer, in phrases of quantity of a substance per unit quantity of solution. In chemistry, the most commonly used unit for molarity is the range of moles consistent with liter, having the unit symbol mol/L or mol/dm³ in the SI unit.

Molarity (M) is the quantity of a substance in a certain volume of solution. Molarity is described as the moles of a solute consistent with liters of an answer. Molarity is likewise called the molar attention of a solution.

Calculation:-

The density of the solution is 1.41 g/mL.

1000 g of the solution will have a volume = Mass/ Density

                ​ =  1000 / 1.41

                     =709 ml.

The mass percent of nitric acid is 70%.

1000 g of the solution will have = 1000× 70/100

                                                       =690 g of nitric acid.

The molarity of the solution is  = Mass of nitric acid / The molar mass of nitric acid ×Volume of solution.

Mass of nitric acid = 700 / 63×709

                              = 0.0157 M.

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The number of mole of air in the ball, given that the volume of the ball is 5.2 litres is 0.13 mole (Option A)

We'll begin by listing out the given parameters from the question. This is given below:

From the above parameters, we can obtain the number of mole as follow

PV = nRT

61 × 5.2 = n × 8.314 × 305

317.2 = n × 2535.77

Divide both sides by 2535.77

n = 317.2 / 2535.77

n = 0.13 mole

Thus, the number of mole is 0.13 mole (Option A)

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The given question is incomplete and the complete question is

Ammonia burns in the presence of a copper catalyst to form nitrogen gas. 4 NH3(g) + 3 O2(g) → 2 N2(g) + 6 H2O(g) ΔΗ = -1267 kJ What is the enthalpy change to burn 38.4 g of ammonia?​

Ammonia burns in the presence of a copper catalyst to form nitrogen gas. 4 NH3(g) + 3 O2(g) → 2 N2(g) + 6 H2O(g) ΔΗ = -1267 kJ and the enthalpy change to burn 38.4 g of ammonia is

Ammonia means NH₃ is one of the most commonly produced industrial chemical

Here given data is

ΔΗ = -1267 kJ

And the balanced reaction is

4 NH₃(g) + 3O₂(g) → 2N₂(g) + 6H₂O(g)

We have to calculate enthalpy change to burn g of ammonia = ?

First calculate the moles corresponding to 38.4 g NH₃

The molar mass of NH₃ is 17.03 g/mol

38.4 g ×1mole/17.03 g/mol = 2.25 mol

Then calculate the enthalpy change to burn 2.25 mol of ammonia

And according to the thermochemical equation 1267 kJ are released per 4 mole of ammonia that react

2.25 mol×(-1267kJ/4 mol) = -713 kJ

Enthalpy change to burn 38.4 g of ammonia is  -713 kJ

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Potassium chloride can be defined as a metal halide salt composed of potassium and chlorine. It is odorless and has a white or colorless.

To prepare Potassium Chloride from Potassium Chloride Solution.

1. KCl can be analyzed by reacting bases of potassium (such as potassium hydroxide) with hydrochloric acid. This ensures acid-base neutralization reaction will yield water and potassium chloride as the products.

KCL + HCL = KCL + H2O

2. Boiling the solution can help in removing the water until a super-saturated solution is obtained and then cooling the super saturated solution at room temperature and introducing a seed crystal of Potassium chloride, crystals of Potassium chloride are obtained.

This is how , pure crystals of potassium chloride from potassium chloride solution

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The aqueous solution here would freeze at -9.163 degree celsius.

The temperature at which it boils is 375.60 K. This gets converted into Celsius = 102.45-degree Celsius (i)

The standard temperature of boiling is = 100 degree Celsius (ii)

The standard temperature of freezing is = 0 degrees celsius (iii)

We know the formula -  

Depression in cooling/ Elevation in boiling = [tex]K_{b}[/tex] / [tex]K_{f}[/tex] (iv)

The standard values for both Ks are 0.5 and 1.87 respectively. (v)

Using the given values of (i), (ii), (iii), (iv), and (v), we find that -

= (102.45 - 100.00) / (0 - x) = 0.5 / 1.87

x, here is the temperature for freezing.

= Temperature at which it freezes = - 9.163 degree Celsius.

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Stoichiometry is the representation of balanced chemical equation, that involves the amount or quantities of reactants and products involved in the reaction.

In a chemical equation, stoichiometry is the relation between two or more substances. Stoichiometry can be the definite proportions in which elements or compounds react with one another. The rules followed in calculating the stoichiometric relationships are based on the laws of conservation of mass and energy and the law of combining weights or volumes.

For example:

N2 (g) + 3H2(g) → 2NH3(g)

In the above reaction, Nitrogen (N2) and Hydrogen (H2) react to form Ammonia (NH3).

1 molecule + 3 molecules = 2 molecules

       There is another concept known as the stoichiometric coefficient, this gives us the number of molecules that are participating in the reaction.

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The rotational spectroscopy looks like many peaks joined together in the shape of parabola. The number of peaks depends on the shape of the molecule. The peaks are 2B distance apart from each other.

What is rotational spectroscopy?

Rotational spectroscopy is an absorption spectroscopy where the energies of transitions between the energy levels of a molecule in the gas is measured. It is also called as microwave spectroscopy. Rotational spectroscopy only works on the molecules which have permanent dipole moment.

In rotational spectroscopy each line represents a transition between energy levels.

E = BJ (J+1)  

where J = energy level, B = rotational constant.

When the transition is from J = 0 to J = 1,

E = E(f) - E(i) = B x 1 (1+1) - B x 0 (0+1) = 2B - 0B = 2B.

Therefore, the spacing between the peaks in Rotational spectroscopy is 2B. The number of peaks depends on the shape of the particular molecule.

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Answer:

Solution X is a base, and solution Y is an acid

Explanation:

PH for acidic is 1 to 6

PH for neutral is 7

PH for alkaline is 8 to 14

My prediction on the conspicuous changes which occurs simultaneously during flooding activities is that it decreases the oxygen levels which are available to habitat and even destroy the community.

The oxygen levels are affected whenever flooding activities occur in a given habitat when its activities damage the community by way of sedimentation.

So therefore, we can now confirm from the explanation above that when flooding occurs to a given habitat of organisms, it reduces the quality of water levels which directly affect the oxygen levels too.

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The must be true of the two elements is All of the above.

An element is a substance composed of only one type of atom that cannot be broken down into simpler substances by either physical or chemical processes. They are divided into metals, non-metals, and semi-metals. Helium is the element with atomic number 2 in the periodic table. Each helium atom has two protons in its nucleus.

The atomic weight of the element is 4.0026. Helium is known as a gas in its pure form because it does not combine easily. A compound is a unique substance formed by the chemical combination of two or more elements. Compounds are formed through chemical reactions. Elements of a compound are held together by chemical bonds.

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Answer:

Explanation:

This practical can be used to introduce the idea that the relative amounts of a fuel and oxygen (from air) are important in combustion, and that there will be an optimum ratio in which the two substances react. This leads on to the idea of chemical equations.

In the case of a class experiment, where students generate the hydrogen themselves under strict supervision, all the hydrogen generators must be collected once the test tubes have been filled and before any flames are lit, to prevent the possibility of accidental or deliberate ignition of the hydrogen in the generator. This has caused a number of accidents in the past. Alternatively the test tubes could be filled with hydrogen beforehand, or by students under supervision, from a steady cylinder supply.

A six-carbon alkyne that can exist as diastereomers is 3-methyl-1-pentyne.

Alkynes are hydrocarbons which contain carbon-carbon triple bonds. Their general formula is CnH2n-2 for molecules with one triple bond (and no rings).  the compound contains 6 Carbon atoms, its said to be an alkyne therefore compound should contain a triple bond.

There should be single C as chiral centre. This means that one carbon has 4 different groups attached to it. In the diagram shown has one carbon connected to

1- Hydrogen

2 - CH3 group

3 - C2H5 group

4 - C≡CH

All these groups are of different types, hence the C is a chiral centre .

therefore A six-carbon alkyne that can exist as diastereomers is 3-methyl-1-pentyne.

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The amount of oxygen formed when 6.54 grams ammonium perchlorate reacted is 0.89 grams.

The balanced chemical equation of the reaction of ammonium perchlorate is,

2NH₄ClO₄ → N₂ + Cl₂ + 2O₂ + 4H₂O

From the reaction it is clear that,

2 moles of ammonium perchlorate = 2 moles of oxygen

Moles of ammonium perchlorate = Moles of oxygen

Moles = Formed/reacted mass/molar mass.

Molar mass of Ammonium perchlorate is 117 g/mol.

Molar of oxygen is 16 g/mol.

Mass of NH₄ClO₄ is 6.54 grams.

Putting values,

6.54/117 = formed mass of oxygen/16

Formed mass of oxygen = 0.89 grams.

So, the mass of oxygen formed is 0.89 grams.

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Answer:

C would be the nervous system reacting

If you wanted to know about the other answers:

A and D are the circulatory system since it's transporting stress hormones through the blood and the heart rate speeds up

B is the muscular and skeletal system since they are the ones that make your body move

At 14.52 K, the population of the first energy level is 1/e times that of the ground state.

Temperature and the energy difference between the levels affect the relative population of particles in certain rotating levels. The excitation of particles from one level to another is caused by a rise in temperature.

HCl has a rotational constant (B) of 10.59 cm⁻¹

Identify the ground state's and the first rotational level's energies.

The formula is used to calculate the energy of a rotational level.

E = hcBJ (J + 1)

Following is the calculation of the energy of the ground state (J = 0):

E = hcBJ (J + 1)

E = 6.626 * 10⁻³⁴ J s * 2.998 * 10¹⁰cm s⁻¹ * 10.59 cm⁻¹ * 1 (1 + 1)

E = 4.207 * 10⁻²² J

Using the provided formula, the population of rotational level J in comparison to the ground state is computed.

[tex]\frac{N_{j} }{N_{0} } = 2J + 1 [ \frac{-E_{j} }{_{e}k_{B}T }[/tex]         --- (I)

The J-level population is known as [tex]N_{j}[/tex]

N is the ground state's population.

The Boltzmann constant is [tex]k_{B}[/tex]

The temperature is T.

The answer to the query is

N₁ = 1 / e (N₀)

N₁ / N₀ = 1 / e      ⇒  (II)

Equate (I) and (II)

1 / e = [2 (1) + 1] [tex][ \frac{-E_{j} }{_{e}k_{B}T }][/tex]

1 / 2.718 = (3) (-4.207 * 10⁻²² J) / (1.381 * 10⁻²³ J K⁻¹ * T)

0.368 = 3 *  (-4.207 * 10⁻²² J) / (1.381 * 10⁻²³ J K⁻¹ * T)

0.368 = 3 * e (-30.46 K / T)

Simplifying the above expression:

0.368 = 3 * e (-30.46 K / T)

In 0.368 = In 3 + (-30.46 K / T)

-0.999 = 1.098 - (30.46 K / T)

(-30.46 K / T) = 1.098 + 0.999

Solving for T:

(30.46 K / T) = 1.098 + 0.999

(30.46 K / T) = 2.097

T = 30.46 K / 2.097

Therefore, 14.52 K is the temperature where the first energy level's population is 1/e times that of the ground state.

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COMPLETE QUESTION:

At what temperature would the population of the first rotational level of HCl be 1/e times the population of the ground state? The rotational constant for HCl, B, is equal to 10.59 cm⁻¹

.

cyclohexanone is the compound which is shown.

what is cyclohexanone-

The chemical substance known as cyclohexanone has the formula (CH2)5CO. The compound is a six-carbon cyclic molecule with a functional group called a ketone.

IUPAC (International Union of Pure and Applied Chemistry) nomenclature is based on the naming of a molecule's longest chain of carbons connected by single bonds, whether in a continuous chain or in a ring.

six-carbon ring with oxygen bonded to one of the carbon atoms in the ring is cyclohexanone.

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IUPAC nomenclature of structure 1 is 5-bromo-3-ethyl-2,2-dimethylhexane and for structure 2 it is  1,1,4-trimethyl-3 -(1-methylethyl)cyclohexane

IUPAC nomenclature is based on naming a molecule's longest chain of carbons connected by single bonds, whether in a continuous chain or in a ring. All deviations, either multiple bonds or atoms other than carbon and hydrogen, are indicated by prefixes or suffixes according to a specific set of priorities

In structure 1 the longest chain was found to be a 6 carbon chain and the numbering started from the side where it is highly substituted. Hence the name is 5-bromo-3-ethyl-2,2-dimethylhexane

In structure 2 we have a cyclic structure and so the numbering will be done in such a way that all the substituent gets the least numbering hence the name of the compound will be 1,1,4-trimethyl-3 -(1-methylethyl)cyclohexane

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