during the 4th of july celebration, a little kid asks you how they make fireworks different colors

Diels alder reaction is the reaction between diene and dienophile. Diene is electron rich and dienophile is elctron deficient species. In that diene involved 4 electron and dienophile involved 2 electron.

Diels-Alder reactions are usually catalyzed by Lewis acids. However, Diels-Alder reactions catalyzed by bases are unusual and only a few asymmetric, base-catalyzed reactions are known.

For example, the reaction of anthrone and N-methylmaleimide can be catalyzed by alkaloids However, only moderate ees were obtained.

These compounds can also be formed from the same type of cyclization process when the silyl group is attached to the 2 and/or 3 positions of a 1,3-diene.

The Diels–Alder reaction is a well-known and established reaction in organic chemistry consisting of a highly selective [4+2] cycloaddition of a diene to an alkene (dienophile) to yield cyclohexene derivatives.

This reaction provides an opportunity to surpass the limitations related to the coupling of chemically sensitive (bi ) molecules (as antibodies), especially in aqueous environments where both the rate and stereoselectivity of Diels–Alder reactions are significantly increased.

Here we do combination of reactant A and B ana get product back.

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The mass of aluminum required to prepare 297.0g of chromium is 154.25 g.

The formation of chromium using aluminum powder is an exothermic process as heat is evolved in this process. In this type of reaction heat is released during the formation of product.

The balanced chemical reaction for the formation of chromium is given as,

Cr₂O₃(s) + 2Al(s) -> 2CrO(s) + Al₂O₃(s)

Thus, we can see that 2 moles of aluminum produces 2 moles of chromium.

Hence,

Molar mass of aluminum = 27g

∴ 2 moles of aluminum is required then mass of aluminum is 2 x 27 = 54g.

Molar mass of chromium = 54g

∴ 2 moles of chromium is obtained then mass of chromium is 2 x 54 = 104g.

Therefore, the amount of aluminum required,

mass of aluminum produced = 54 x 299/ 104

                                                = 16146/104 = 155.25 g.

Therefore, the required amount of aluminum is 154.25 g.

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Answer:

The equation gives the frequency of a photon

f = E/h,

Where E is the photon's energy and h is Planck's constant (6.626 x 10-34 J s).

Substituting the values, we get:

f = 2.55 x 10-18 J / (6.626 x 10-34 J s)

 = 3.85 x 1015 Hz

Explanation:

The coefficients in front of br2 and oh- in the balanced reaction:

Br2 = 3, OH- = 6

There are indices that are part of the chemical formulas of the reactants and products. Also, there is a coefficient in front of the formula that indicates how many molecules of that substance are used or produced.

The number before the equation to balance the equation is called the factor which multiplies all the atoms in the equation. For example, the symbol 2NaHCO3 indicates two units of sodium bicarbonate containing 2 Na atoms 2 H atoms 2 C atoms, and 6 O atoms. Coefficients indicate how many numerators there are in a given expression.

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Soil acidification is a circumstance which will most likely lead to a change in the nutrient cycling that will have a detrimental impact on plant growth.

The chemical industry depends on nitrogen. It is used to create explosives, nylon, nitric acid, fertilizers, and colors. N must first be combined with hydrogen to create ammonia in order to create these products. The Haber process is used for this. Similar to chlorine gas and carbon monoxide poisoning, nitrous oxide poisoning is detrimental to all living things.

Effects on health. The majority of greater nitrogen oxides are irritants to the eyes, skin, and respiratory system. Except at deadly quantities, where arginine may kill more quickly, no2 is a corrosive chemical that, when in contact with water, produces nitric and nitrous acids.

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When fossil fuels are burned, they release large amounts of carbon dioxide, a greenhouse gas, into the air.

What is Greenhouse gas ?

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Ka of Monoprotic Acid

Ka = [H+] [A-] / [HA]

One proton or hydrogen atom per molecule is all that a monoprotic acid contributes to an aqueous solution. In contrast, polyprotic acids, which can donate more than one proton or hydrogen, can do so. Depending on how many protons they can contribute, polyprotic acids can be further divided into several types.

Given,

Ph = 5.42;

Conc of unknown MonoProtic Acid = 0.095M;

X= conc. of H+ = 3.8×10∧-6

Ka = x∧2 / 0.095 - x

We know the value of x, obtained from pH:

x = [H+] = 10∧-5.42 = 3.8 x 10∧-6

We solve for Ka

Ka = [3.8 x 10∧-6]2 / [0.095 - 3.8 x 10∧-6]

Ka = 1.5216 x 10∧-10

So, Ka of Monoprotic Acid

Ka = [H+] [A-] / [HA]

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Answer:

Trichloroethane is a solvent used to remove grease from clothes.

The temperature at which phase changes occur is highly dependent on the electrostatic forces between the molecules in the substance.

The forces that hold molecules together are called intermolecular forces. These intermolecular forces affect the temperature at which phase changes occur. The  statement about phase changes and electrostatic forces that is correct is that; "the temperatures at which a substance changes phases indicate the relative strength of the forces between molecules in the substance."

There are three states of matter, solid liquid and gas. The order of intermolecular forces in all the states of matter are not the same. The order of strongest collective electrostatic forces to weakest collective electrostatic forces is; solid, liquid, gas.

When water boils, the forces between water molecules break, and the bonds between the atoms in water are unchanged.

When a sample of calcium carbonate is cooled, the forces strengthen, and the molecule structure becomes more rigid.

If the boiling point of acetone is lower than the boiling point of ethanol, then, the intermolecular forces in ethanol are stronger than the intermolecular forces in acetone.

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This answer is very late, so this is for whoever is taking the Electrical Bonding Particle Spacing Quick Check lol

The answer is The temperatures at which a substance changes phases indicate the relative strength of the forces between molecules in the substance.

The rest of the answers on the quick check are...

- solid, liquid, gas

- The forces between water molecules break, and the bonds between the atoms in water are unchanged.

- The forces strengthen, and the molecule structure becomes more rigid.

- The intermolecular forces in ethanol are stronger than the intermolecular forces in acetone.

The volume % of ethanol in the solution is 3.04%.

What is volume?
A three-dimensional space's volume can be calculated. It is frequently expressed numerically using units derived from SI (like the cubic metre and litre) or by different imperial us Or customary modules (such as the gallon, quart, cubic inch). Volume and length are related by the description of length (cubed). In contrast to how much space the container actually occupies, the volume of the a container is typically thought of as its carrying capacity, or the amount of fluid (liquid or gas) that it could hold. Volume was first measured in the past using naturally occurring containers of a similar shape, and later, standardised containers.

Volume % of ethanol = (7 ml ethanol / (7 ml ethanol + 222.2 ml water)) x 100

= (7/229.2) x 100
= 3.04% ethanol
Therefore, the volume % of ethanol in the solution is 3.04%.

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Answer:

200Joules

Explanation:

W=Fd                                                                                                                                         W=10×20                                                                                                                             W=200J

The green wavelength is absorbed by the medium hence it does not appear.

We know that absorption has to do with the process by which the atom is able to take in energy and this would lead to the upward movement of the electrons that are in the atom.

Thus the wavelengths that can be taken in by the atom as it is absorbing energy can be seen in the absorption spectrum. It is also possible to have gaps in the absorption spectrum due to absorption by the medium.

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The Bronsted-Lowry acid, base and the conjugate acid-base in each of the following reactions are mentioned below serially:

Bronsted-Lowry acid                                  Bronsted-Lowry base

HNO₃                                                           H₂O

H₂O                                                              NH₃

H₂SO₄                                                          OH⁻

H₂O                                                              C₂H₃O₂⁻

H₂PO₄⁻                                                         OH⁻

H₃O⁺                                                             H₂PO₄⁻

HCO₃⁻                                                           H₂O

H₂O                                                               HCO₃⁻

Conjugate acid:                                           Conjugate base:

H₃O⁺                                                             NO₃⁻

NH₄⁺                                                             OH⁻

H₂O                                                              HSO₄⁻

HC₂H₃O₂⁻                                                    OH⁻

H₂O                                                              HPO₄²⁻

H₃PO₄                                                          H₂O

H₃O⁺                                                            CO₃²⁻

H₂CO₃                                                          OH⁻

Bronsted-Lowry acids are known to be substances those donate protons or H+ ions to other compounds to produce conjugate bases. Bronsted-Lowry bases are the substances that accept protons or H+ ions from other compounds to form conjugate acids.

For the given reactions:

a. HNO₃ + H₂O ⇔ H₃O⁺ + NO₃⁻

Bronsted-Lowry acid: HNO₃

Bronsted-Lowry base: H₂O

Conjugate acid: H₃O⁺

Conjugate base: NO₃⁻

b. NH₃ + H₂O ⇔ NH₄⁺ + OH⁻

Bronsted-Lowry acid: H₂O

Bronsted-Lowry base: NH₃

Conjugate acid: NH₄⁺

Conjugate base: OH⁻

c. H₂SO₄ + OH⁻ ⇔ HSO₄⁻ + H₂O

Bronsted-Lowry acid: H₂SO₄

Bronsted-Lowry base: OH⁻

Conjugate acid: H₂O

Conjugate base: HSO₄⁻

d. C₂H₃O₂⁻ + H₂O ⇔ OH⁻ + HC₂H₃O₂

Bronsted-Lowry acid: H₂O

Bronsted-Lowry base: C₂H₃O₂⁻

Conjugate acid: HC₂H₃O₂⁻

Conjugate base: OH⁻

e. H₂PO₄⁻ + OH⁻ ⇔ HPO₄²⁻ + H₂O

Bronsted-Lowry acid: H₂PO₄⁻

Bronsted-Lowry base: OH⁻

Conjugate acid: H₂O

Conjugate base: HPO₄²⁻

f. H₂PO₄⁻ + H₃O⁺ ⇔ H₃PO₄ + H₂O

Bronsted-Lowry acid: H₃O⁺

Bronsted-Lowry base: H₂PO₄⁻

Conjugate acid: H₃PO₄

Conjugate base: H₂O

g. HCO₃⁻ + H₂O ⇔ H₃O⁺ + CO₃²⁻

Bronsted-Lowry acid: HCO₃⁻

Bronsted-Lowry base: H₂O

Conjugate acid: H₃O⁺

Conjugate base: CO₃²⁻

h. HCO₃⁻ + H₂O ⇔ H₂CO₃ + OH⁻

Bronsted-Lowry acid: H₂O

Bronsted-Lowry base: HCO₃⁻

Conjugate acid: H₂CO₃

Conjugate base: OH⁻

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Answer:

[tex] \huge{ \boxed{1.213 \: \text{moles}}}[/tex]

Explanation:

To find the number of moles in a substance given it's number of entities we use the formula

[tex] \bold{n = \frac{N}{L}} \\ [/tex]

where

From the question

N = 7.30 × 10²³ NaCl molecules

[tex]n = \frac{7.30 \times {10}^{23} }{6.02 \times {10}^{23} } = \frac{7.30}{6.02} \\ = 1.2126[/tex]

We have the final answer as

The number of atoms equals 4.6 which are present in a 24.56 g sample of sulfur.

Equation:

The first step in calculating the number of atoms is to determine the number of moles. To get the number of moles in an element or compound, divide the supplied mass by the element or compound's molar mass. The number of atoms in 1 mole of a substance is 6.023 10 23.

The stated mass is 24.56 g M, and the molar mass of sulphur is 32.065 g/mole.

n = m / M

n = 24.56 / 32.065

n=0.76 moles.

The number of atoms in 1 mole of a substance is 6.023 10 23.

Number of atoms for 0.76 moles equals n * Na

number of atoms equals 0.76 moles * 6.023 10 23 atoms

number of atoms equals 4.6

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The energy of orange light emitted, per photon is 3.25 × 10-¹⁹ J

Given data in the question;

Frequency; f = 4.92× 10¹⁴ Hz

Energy of the orange light emitted; E = ?

Photon energy is energy carried by a single photon, which is represented by the expression:

E = hf

Where:

E = photon energy,

h = Planck's constants ( 6.626×10-³⁴ JHz-¹ )

f = frequency

substitute our values into equation

E= (6.626 × 10-³⁴ J / Hz) * (4.92× 10¹⁴ Hz

= 3.25 × 10-¹⁹ J

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The wavelength (in nm) of the orange light emitted by a neon sign with a frequency of 4.92 × 1014 Hz is 609.2 nm

What are frequencies and wavelengths?

The wavelength, which will also apply to troughs, is the separation between two wave crests. The frequency is measured in cycles per second (Hz), which is the quantity of vibrations that cross a specific area in a second (Hertz).

Each photon of orange light emits 3.25 10-19 J of energy.

the information in the query;

F = 4.92 1014 Hz is the frequency.

Energy of the released orange light: E =?

A single photon carries energy, and this is referred to as photon energy.

E = hf

Where: h = Planck's constants (6.62610-34 ),

E = photon energy

Substituting our values into the equation f = frequency

E= (6.626 × 10-³⁴ J / Hz) * (4.92× 10¹⁴ Hz)

= 3.25 × 10-¹⁹ J

E = hc/λ

6.626 × 10-³⁴ JHz-1 * 3.00 × 108 m/s/3.25 × 10-¹⁹ J

λ = 609.2 nm

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The value of the Equilibrium Constant is 1  when 0.025 m NH3, 0.25m N2 is added to the flask.

The value of a chemical reaction's reaction quotient at chemical equilibrium, a state that a dynamic chemical system reaches when enough time has passed and at which its composition has no observable tendency to change further, is the equilibrium constant for that reaction. As a result, the composition of a system at equilibrium can be calculated from its initial composition using known equilibrium constant values. The equilibrium constant's value, however, may be impacted by parameters affecting the reaction, such as temperature, solvent, and ionic strength.

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Answer:

0.1 mole

Explanation:

According to the formula, 1 mol of CaCO3 will require 2 mol of HCl

Molar mass of CaCO3 = 40.08 + 12.01 + 3(16.00) = 100.09 g/mol

so the 5g of CaCO3 equals : 5g x (1 mol/100.09g) = 0.0499 or 0.05 mol

so the mole of HCl required is: 0.05 x 2 = 0.1 mol

Answer:

[A] Plant shoots are positively phototropic and negatively gravitropic. [B] Plant shoots are negatively phototropic and positively gravitropic. [C] Plant shoots are negatively hydrotropic and positively gravitropic. [D] Plant shoots do not display any major tropisms.

Answer:-Gravitropism. It is a type of tropism where plants show some growth in response to gravity. ...

Chemotropism. There are few chemical substances, which are actively responsible for bringing a curvature movement in plant organs. ...

Thigmotropism. ...

Hydrotropism. ...

Thermotropism.                                                                                                                     The below mentioned article will highlight the six types of tropic movements in plants.

The six types are: (1) Thigmotropism (Haptotropism) (2) Phototropism (3) Geotropism (4) Thermotropism (5) Chemotropism and (6) Hydrotropism.                A tropism is a growth movement whose direction is determined by the direction from which the stimulus strikes the plant. There are two forms: Positive = the plant, or a part of it, grows in the direction from which the stimulus originates. and Negative = growth away from the stimulus.                         tropism is a biological phenomenon, indicating growth or turning movement of a biological organism, usually a plant, in response to an environmental stimulus. In tropisms, this response is dependent on the direction of the stimulus (as opposed to nastic movements which are non-directional responses).

Unique properties of water

Water molecules have a bent overall structure, partial positive charges on the hydrogens, partial negative charges on the oxygen, and are polar. This is due to the fact that oxygen is more electronegative than hydrogen, making it more effective at drawing electrons. Excellent solvents include water.

Temperature alters the three states of water, which are solid (frozen), liquid, and gas. Although the interactions of the water molecules change, the molecules themselves do not alter between the phases.

Water quality's physical characteristics

Color: Polluted water may be coloured; pure water is colourless.

Turbidity: Clear, light-unabsorbing water is the opposite of pure water.

Taste and odour: Pure water never has a taste or an odour.

Given their polar nature, water molecules form hydrogen bonds. This gives water its distinctive properties, including polarity, solvency, cohesion, adhesion, high specific heat, and the capacity to act as a buffer. A solute that has dissolved in a solvent creates a homogeneous mixture known as a solution.

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The number of protons, electrons, and neutrons in the element, ⁴⁸₂₂X is:

Number of protons = 22

Number of electrons = 22

Number of neutrons = 26

Protons are the positively charged particles found within the nucleus of an atom. The number of protons in the nucleus of an atom gives the atomic number of that element.

Electrons are the negatively-charged particles found within electron shells or a[orbits around an atom.

Neutrons are the neutral particles found within the nucleus of an atom. The number of neutrons together with the protons gives the atomic mass of the atom.

The given element, ⁴⁸₂₂X has the following number of protons, electrons, and neutrons:

Number of protons = 22

Number of electrons = 22

Number of neutrons = 48 - 22

Number of neutrons = 26

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6.10 is the concentration of a solution prepared by mixing 5.00 ml of deionized water with 3.00 ml of a 1.31 m solution.

Add the mass of the solute to the total volume of the solution. Write down C = m/V, where m is the mass of the solute and V is the total volume of the solution.

The amount of solute dispersed in one liter of solution, or its molarity (M), is measured in moles. To determine a solution's molarity, divide the number of moles of solute by the volume of the solution, measured in liters. To be clear, the volume is expressed in liters of solution rather than liters of solvent.

Mass total  = mass of solute + mass of solvent

m = 5+3 = 8.00ml

C = m/V

C = 8 / 1.31 = 6.10

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Answer:

B. its temperature

Explanation:

Cu(NO3)2 + Zn + Cu Zn (NO3) From most reactive to least reactive, metals are represented as 2 + Cu.

A is the ideal answer.

Explanation: Lithium, sodium, potassium, potassium, rubidium, cesium, and francium are alkali metals (Fr). The metals become more reactive as you proceed down the column because the nucleus gains more electrons and protons (more electron levels), reducing the electrostatic force of the metals.

Reactive Metal: What Does That Mean? A class of metal elements known as reactive metals can react with acids, water, mineral acids, and potent oxidizing acids. This group can be recognized using the activity or reactivity series, which ranks the most reactive metals in order of increasing reactivity.

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Melt-away creamery combines sugar, cream, and best natural flavorings, then churns and freezes resulting mixture at low temperature, creating ice cream. This method is an example of process manufacturing.

A production method that creates goods by combining supplies, ingredients or raw materials using formula or recipe is called process manufacturing.

It is usually used in industries that produce bulk quantities of goods, like food, beverages, refined oil, gasoline, pharmaceuticals, chemicals and plastics. Process manufacturing is also known as a process industry and is defined as an industry, like the chemical or petrochemical industry, that is concerned with the processing of bulk resources into other products.

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When the hydrochloric acid react with the lime water then the product is formed by the reaction is calcium chloride.

The reaction of the hydrochloric acid with the reaction of the lime reaction is given as :

Ca(OH)₂   +      HCl    ---->      CaCl₂   +   H₂O

lime water     hydrochloric    calcium      water

                         acid             chloride

the safety taken during the reaction of acid and bases are :

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When both products are soluble, a double replacement equation will not produce a reaction.

We use the (s) symbol for solid because salt is an insoluble substance that will not dissolve in water. The silver, fluoride, potassium, and chloride ions would have effectively moved to a new location if there had been no precipitate formation, but they would still be floating around as ions. In this scenario no reaction happens.

A double replacement reaction occurs when two ionic compounds swap ions to form two new ionic compounds. The following response is an example of this kind: AB + CD AD + CB.

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10.5 kJ is required to convert the temperature of water.

What is Temperature?

Temperature is a unit used to describe hotness or coldness. It can be stated in terms of any number of arbitrary scales and shows the direction in which heat energy will naturally flow, i.e., from a hotter body to a colder body (one at a lower temperature). Temperature is not the same as the energy of a thermodynamic system; for instance, an iceberg has a significantly larger total heat energy than a match.

As opposed to extensive characteristics, like mass or volume, temperature is referred to as an intense property—one that is independent of the quantity of matter being considered—along with pressure, density, and other comparable properties.

q=m⋅c⋅ΔT, where

q - heat absorbed

m- the mass of the sample

c- the specific heat of the substance

ΔT - the change in temperature, defined as final temperature minus initial temperature

q=100.0g⋅4.18Jg∘C⋅(50.0−25.0)∘C

q= 10.5 kJ

10.5 kJ is required to convert the temperature of water.

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250 ml of nitrogen diffuses through a porous membrane in 30 seconds while 300 ml of an unidentified gas does so in 45 seconds. For example, at the same temperature and pressure, methane diffuses in the same volume in 10 minutes while 240 ml of gas x diffuses through a porous membrane in 20 minutes.

What is  porous membrane?

The gas's ethane partial pressure at the same total pressure. Compared to nitrogen, oxygen and carbon dioxide are both gases. the amount of time needed to carburete an iron-carbon alloy to reach a 0.45 weight percent carbon concentration at a place 2 mm away from its initial condition in 30 seconds. 100 mL of hydrogen diffuses in 5 seconds, while 100 mL of the unidentified gas does so in 20 seconds.

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