10
has the following chemical formula:
CH2
One molecule of pentane contains
C=
H=

If you were to observe light generated by heating pure elements through a prism or spectroscope, you would notice a unique spectral pattern. The spectral pattern would appear as a series of colored lines separated by dark spaces, and this is known as the atomic spectrum of the element.

Each pure element has its own distinct atomic spectrum, which arises due to the arrangement of electrons in the element's atoms. The electrons in the atoms occupy energy levels, and when they transition between these levels, they emit or absorb light at specific wavelengths. These wavelengths correspond to the different colors observed in the atomic spectrum. Therefore, the use of a prism or spectroscope can reveal valuable information about the composition of the element, as well as its electronic structure. Overall, studying the spectral patterns of different pure elements can provide insight into the fundamental building blocks of matter and the interactions of atoms with light.

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Answer:

Sodium (Na – Natrium)

Potassium (K – Kalium)

Iron (Fe – Ferrum)

Copper (Cu – Cuprum)

Silver (Ag – Argentum)

Tin (Sn – Stannum)

Antimony (Sb – Stibium)

Tungsten (W – Wolfram)

Explanation: hope this helped?

Answer:

Crushing large stones into smaller stones would be a physical change because you are merily crushing its physical size, while the chemical composition for the stone stayes the same.

A maximum of two electrons will be placed in 1s first. With a maximum of two electrons, 2s will then be filled. With a maximum of 6 electrons, 2p will then be filled.

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Answer:

i think sience is important cause it helps us understand things i am  muslim and i trust my religon amore than seince but also trust sience

.Explanation:

cause it helps me understand and learn things

Answer:

Neodymium is a naturally occurring element that was first discovered by Austrian chemist Carl Auer von Welsbach in 1885. It was discovered in the mineral cerite, which was found in a mine in the village of Bastnäs, Sweden. Neodymium can also be produced by nuclear reactors or particle accelerators by the process of neutron capture. This isotope of neodymium is highly radioactive and has a very short half-life, making it unsuitable for most practical applications.

Answer:

It's not A or D

Explanation:

I was looking all over for answers and I saw A and D, so I used A. It was wrong, so I retook it and used D. Wrong. Your answer is either B or C. I am sorry I couldn't help more.

Answer:

it is b same question was on my quiz

Explanation:

Answer:

Explanation:

i dont know either but im working on it now, i think that you are supposed to use this equation Q = m * ΔT * Cp once i get the answer ill tell you

Water is absorbed by CaCl2 molecules, resulting in bigger molecules. In order for the solute to dissolve in the solvent, the solute-solute interactions between the solute particles must be disrupted.

An inorganic material is calcium chloride, a salt with the chemical formula CaCl2. It is a white, crystalline substance that is highly water soluble at ambient temperature. It may be created by neutralizing calcium hydroxide with hydrochloric acid. By reducing the freezing point of water, calcium chloride is used to both prevent the production of ice and to remove it. This application makes the maximum use of calcium chloride.

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The value of ΔG for the given reaction was calculated to be 391.483 kJ/mol.

G represents Gibbs free energy, so ΔG represents the Gibbs free energy change. The Gibbs free energy change is a measure of the spontaneous nature of a process such as a chemical reaction.

Given reaction,

H₂(g) + O₂(g) ⇆ H₂O₂(g) ,  K = 2.1 × 10³⁷

2H₂(g) + O₂(g) ⇆ 2H₂O(g), K= 2.4 × 10⁶

Reverse the reaction and divide it with 2

H₂O  ⇆ H₂ +  1/2O₂, K =  (1/ 2.4 × 10⁶)¹/²

K = (0.146  × 10⁻⁶)¹/²

K= 0.644  × 10⁻³

On adding equations 1 and 3 we get the following equation-

H₂O +  1/2O₂ ⇆ H₂O₂

K= K₁× K₂ = 2.1 × 10³⁷ × 0.644  × 10⁻³ = 1.3524 × 10³⁴

Kc= 1.354 × 10³⁴

ΔG = -2.303 RT log Kc

ΔG = -2.303× 0.00834 ×599 log [1.3524 × 10³⁴]

        -11.47 [log (1.3524) + log 10³⁴)]

         -11.47 [ 0.1311 + 34

ΔG =  391.483 kJ/mol

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The process of a liquid becoming a gas is called boiling (or vapourization) and the process of a solid becoming a liquid is called melting.

Vaporization is the process of converting a liquid into a gas. It is also called evaporation. Since we know that the particles of a gas are moving faster than those of a liquid, an input of energy must be required for a liquid to become a gas.

Melting is a physical process that results in the phase transition of a substance from a solid to a liquid. During melting, the energy goes exclusively to changing the phase of a substance; it does not go into changing the temperature of a substance. Hence melting is an isothermal process because a substance stays at the same temperature.

Example 1: Industrially, salt is recovered from seawater by the process of vaporization. Wet clothes are dried up due to the process of vaporization. The process is used in many industrial processes for separating the components of a mixture.

Example 2: Ice to water - Ice melts back into the water when it is left out at temperatures above the freezing point of 32 degrees. Rocks to lava - Rocks in volcanoes can be heated until they are molten lava. Metal to molten liquid - Metals such as steel and bronze can be molten down.

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The first person to use heating processes to preserve foods was Nicholas Appert. He discovered that food can be kept from spoiling by heating it and sealing it in airtight containers.

Nicholas Appert, a French confectioner, invented the method of canning food in 1809. He conducted a series of experiments to find a way to preserve food for long periods without it spoiling. Appert discovered that food can be kept from spoiling by heating it and sealing it in airtight containers.

He used glass jars with cork stoppers, which he sealed with wax and then boiled. Appert's invention was later improved by others, such as Louis Pasteur, who showed that the process of heating kills microorganisms that cause food to spoil. Today, canning is a common method used to preserve food, and it is used to produce a variety of food products, including fruits, vegetables, meats, and fish.

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Exothermic type of reaction is taking place because this type of reaction generates heat energy.

Exothermic reactions refer to those chemical reactions that produce heat energy and release that heat energy to the surrounding environment.

So we can conclude that exothermic type of reaction is taking place because this type of reaction generates heat energy.

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Answer:

C. There is a negative acceleration

Explanation:

I majored in Physics

Answer:

zince hypohlorite

Explanation:

Answer:

Zince Hypohlorite

ANSWER

2Ba + 2HBr → 2BaBr + H2

2BiCl3 + 3H2S → Bi2S3 + 6HCl

Br2 + 2KI → I2 + 2KBr

4Fe + 3O2 → 2Fe2O3

Answer:

\(3Mg _{(s)} + N _{2(g)} → Mg_{3} N _{2(s)}\)

\(Ba _{(s)} + 2HBr_{(g)} → BaBr _{2(s)} + H _{2(g)}\)

\(2BiCl_{3(s)} + 3H_{2} S _{(g)} → Bi _{2} S _{ 3(g)} + 6HCl _{(g)} \\ \)

\(Br_{2(g)} + 2KI _{(g)} → I _{2(g)} +2 KBr _{(g)}\)

\(4Fe_{(s)}+ 3O_{2(g)} → 2Fe_{2} O _{3(s)} \)

Your question has been heard loud and clear.

Both scientific laws and scientific theories are not based on hypothesis.

Because , scientific laws are proven and so they are real not hypothetical.

Whereas scientifc theories can be hypothetical.

Thank you

Explanation:

Iron fillings are magnetic in nature so They get attracted by a magnet.

One is through sublimation, where the mixture is heated and iodine gets converted into gaseous form, leaving behind the iron fillings.

(a) To get the pH of the media to 5.8, you would add NaOH solution. NaOH is used as a basic solution, and when it is added to a solution, it will increase the pH of the solution.

(b) The molecular weight of BA is 225.3. To prepare a 1M solution, you would have to weigh out 225.3 grams of BA.(c) To convert a 1M solution of BA to mg/mL, you can use the following equation: 1 mole = molecular weight in grams; 1000 millimoles = 1 mole. So, 1 M = 1000 mg/mL. Therefore, a 1M solution of BA is equivalent to 1000 mg/mL .(d) To convert a concentration of 1000 mg/mL .

Therefore, to calculate the weight required for a 5 mM solution, use the following formula :Mass of BA = molarity × volume × molecular weight= 5 × 0.001 × 225.3= 1.1265 grams(f) To convert a concentration of 5 mM to mg/mL, we use the following formula: Concentration (mg/mL) = (Concentration (mM) × Molecular weight) / 1000= (5 × 225.3) / 1000= 1.1265 mg/mL(g)

To convert a concentration of 1.1265 mg/mL to mg/L, we multiply by 1000, so 1.1265 mg/mL = 1126.5 mg/L.(h) Given that the stock solution of BA is 5 mM and the working solution is 0.2 mg/mL.

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In the crystalized form of aluminum sulfate, Al₂(SO₄)₃xH₂O, the value of x which represents the molecules of water is approximately 6.

The formula mass of Al₂(SO₄)₃ can be calculated as follows:

Al = 2 x 26.98 = 53.96 g/mol

S = 3 x 32.06 = 96.18 g/mol

O = 12 x 16.00 = 192.00 g/mol

Total formula mass = 53.96 + 96.18 + 192.00 = 342.14 g/mol

The relative formula mass of hydrated aluminum sulfate is 666, so the mass of water in the formula can be calculated as:

mass of water = 666 - 342.14 = 323.86 g/mol

Since the formula for water is H₂O, the number of water molecules in the formula can be calculated as:

number of H₂O molecules = 323.86/18.02 = 17.92

Since there are 3 sulfate ions in the formula, the number of water molecules per sulfate ion can be calculated as:

number of H₂O per sulfate = 17.92/3 = 5.97

Therefore, the value of x in the formula  Al₂(SO₄)₃xH₂O is 6 (rounded up).

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Answer:

(b)  19.9 moles

Explanation:

To convert from moles Al to moles O₂, you need to multiply the given value by the mole-to-mole ratio of each component. This ratio is constructed via the coefficients in the balanced reaction. The desired unit (moles O₂) should be placed in the numerator to allow for the cancellation of units.

2 Al₂O₃ ----> 4 Al + 3 O₂
                    ^         ^            

26.5 moles Al           3 moles O₂
---------------------  x  ----------------------  =  19.9 moles O₂
                                 4 moles Al

During a chemical reaction, atoms don't appear or disappear. Rather, the atoms of the reactants are rearranged to form products.

The Law of Conservation of Mass states that matter cannot be created or destroyed in a chemical reaction. Therefore, the number of atoms in the reactants is equal to the number of atoms in the products, as no atoms can be created or destroyed in a chemical reaction.

Chemical reactions involve the breaking of chemical bonds in the reactants and the formation of new bonds to create the products. This rearrangement of atoms in the reactants to form products happens because of chemical bonds breaking and new bonds forming.

A chemical reaction may include one or more steps or elementary reactions, which involve one or more molecules, ions, or atoms. Each step has a specific rate and reaction order that determine how fast it occurs and how much product is formed.

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Answer:

Because the exact position of the electron is not known,it must be assumed that the electron takes up the entire space in an orbital.

Explanation:

Chemical reaction can be reversed if the energy of the reactants is less than the activation energy threshold.

A reversible reaction is a reaction in which the conversion of reactants to products and the conversion of products to reactants occur simultaneously.

In equilibrium reaction, the activation energy of the forward reaction is more than that of backward reaction which causes bond breakage of the reactants.

Activation energy = (Threshold energy) - (Internal energy of the reactants)

Thus, a chemical reaction can be reversed if the energy of the reactants is less than the activation energy threshold.

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Activated carbon, also known as activated charcoal, is a crude layout of graphite, the substance utilized for pencil leads. It varies from graphite by having a random, imperfect structure that is favorably porous over a wide range of pore sizes.

The graphite structure provides the carbon its very extensive surface area which entitles the carbon to adsorb a wide scope of compounds. Activated carbon has the strongest physical adsorption forces or the spaced-out volume of adsorbing porosity, of any material known to mankind. Activated carbon is utilized to refine liquids and gases in a combination of applications, incorporating municipal drinking water, food and beverage processing, odor removal, and industrial pollution control.

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Answer:

everything can be found in the picture

Answer:

the mass of each element can be recovered from is 162.23 grams

Explanation:

the mass really depends on the volume. If there is 74.0% carbon, 8.6% hydrogen and 17.3% nitrogen then you first cross out the 0 and 3 which leaves you with 17% and 74%. Then all you have to do is multiply 17% and 74% and then divided it by 8.6%.

The various drugs such as the nicotine as additive drug is a pack of cigarette consist of about 75 of the carbon, 8.6% of hydrogen and about 17.3% of mitogen.

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Use the state equation for ideal gases: pV = nRT

Data:

V = 88.89 liter

n = 17 mol

T = 67 + 273.15 = 340.15 K

R = 0.0821 atm * liter / (K*mol)

=> p = nRT / V = 17 mol * 0.0821 (atm*liter / K*mol) * 340.15 K / 88.89 liter

p = 5.34 atm

Answer: p = 5.34 atm