Sketch 10 atoms of aluminum and 6 molecules of oxygen gas in the container on the left. In the right container, sketch the contents after the reaction is complete.

Answer: It’s A because you change the independent variable to conduct an experiment and get accurate results.

Explanation:

Answer:

The correct answer would be A

Explanation:

I did the test :)

Answer:

This is literally just the definition of a machine

Answer:

The catagen phase is the second transition stage of hair growth; the hair shaft grows upward and detaches itself from the bulb.

Explanation:

Answer:

I think it's 21.5 *C

Explanation:

Answer:

Explanation:

The number of moles of a substance is calculated from the given weight of the substance and its molecular mass by using the formula:

No. of moles = \(\frac{Mass of substance in grams}{Molecular mass of substance}\)

Molecular mass of Na₂SO₄.10H₂O is calculated to be

(23×2)+32+(16×4)+(10×18) = 46+32+64+180 = 322 g/mol

Thus, for 483g of Na₂SO₄.10H₂O, the number of moles would be

= \(\frac{322}{483}\) = 0.67 mol

For every 1 mole of Na₂SO₄.10H₂O, there are 2 moles of Na⁺ and 1 mole of SO₄²⁻.

Thus, 0.67 moles of Na₂SO₄.10H₂O will have 0.67×2= 1.34 moles of Na⁺ and 0.67 moles of SO₄²⁻.

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Mercury is in a liquid state

Mercury's melting point is somewhere around -34 Degrees Celcius. Thus it should be assumed it will be a liquid at this temperature. Not a gas however as mercury's boiling point is somewhere in the 600 Degree range

At 35°C, the value of Kw (the ionic product of water) is 1.16 x 10^-14.

The pH of a solution is determined by the concentration of hydrogen ions (H+) in the solution. The pH of a 0.10 M NaOH solution at 35°C is 12.68. The pH of a solution is related to the ionic product of water (Kw), which is defined as the product of the concentrations of the hydrogen (H+) and hydroxide (OH-) ions in the solution. At 35°C, the value of Kw is 1.16 x 10^-14.

At 35°C, the value of Kw (the ionic product of water) is 1.16 x 10^-14.

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Answer:

3.7

Explanation:

pH+pOH=14

10.3+pOH=14

pOH =14-10.3

3.7

In sp3 hybridization geometry of this molecule is tetrahedral

In organic chemistry, the term hybridization is used to explain chemical bonding when the valence bond theory is insufficient to do so. In order to understand the covalent bonds in organic molecules, this theory is particularly helpful. Hybridization, in its simplest form, is the mixing of atomic orbitals with varying shapes and energies to produce an equal number of hybrid orbitals with the same shape, energy, and orientation, with the goal of minimizing the repulsion between these hybridized orbitals.

Sp3 hybridization is the process by which one s orbital and three p orbitals from the same atom's shell combine to form a new equivalent orbital.

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The chromate anion (CrO₄²⁻) will typically result in an insoluble compound when it reacts with certain cations, such as those of calcium, barium, and lead, forming precipitates such as calcium chromate (CaCrO₄), barium chromate (BaCrO₄), and lead chromate (PbCrO₄).

Bicarbonate (HCO₃⁻), chlorate (ClO₃⁻), and acetate (CH₃COO⁻) anions generally do not form insoluble compounds when they react with cations.

Bicarbonate can form slightly soluble salts with some cations, such as calcium bicarbonate (Ca(HCO₃)₂), but these are usually more soluble than the corresponding carbonates. Chlorate and acetate anions typically form soluble salts with most cations.

The solubility of a compound depends on the nature of the anion and cation, as well as on other factors such as temperature and pH.

In general, when an anion forms a compound with a cation that is insoluble, it is because the lattice energy of the resulting compound is greater than the energy released by the solvation of the ions in water, making the compound thermodynamically unfavorable and causing it to precipitate.

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When a 2˚ or 3˚ asymmetrical alkene (RCH=CHR') is reacted with CH₃CH₂OH (ethanol) and a mercury salt such as Hg(OAc)₂, followed by reduction with NaBH₄, the reaction follows a Markovnikov addition mechanism, and produces a mixture of alcohols.

The first step of the reaction involves the formation of a cyclic mercurinium ion intermediate via the addition of the electrophilic mercury ion to the double bond of the alkene. The mercurinium ion intermediate is then attacked by the nucleophilic ethanol molecule, which opens the ring and adds to the more substituted carbon atom, following Markovnikov's rule. The resulting intermediate is then reduced with NaBH₄ to form the alcohol product.

The overall reaction can be represented as:

RCH=CHR' + CH₃CH₂OH + Hg(OAc)₂ → RCH(OCH₂CH₃)CH₂OH-Hg(OAc)₂

RCH(OCH₂CH₃)CH₂OH-Hg(OAc)₂ + NaBH₄ → RCH(OCH₂CH₃)CH₂OH + R'CH(OH)CH₂OH + Hg + NaOAc

where R and R' are different alkyl groups. The resulting product is a mixture of alcohols: one alcohol is formed from the reaction at the more substituted carbon (the Markovnikov product) and the other alcohol is formed from the reaction at the less substituted carbon (the anti-Markovnikov product).

It is worth noting that the use of mercury in this reaction is potentially hazardous and has been largely replaced by safer alternatives, such as the oxymercuration-demercuration reaction, which involves the addition of an alkene to a mercuric acetate/acetone reagent followed by reduction with sodium borohydride in the presence of a proton source.

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The volume of pycnometer is 20.409 ml.

Volume of pycnometer is determined by using the general formula of  density which is,

density=mass/volume

Considering the data given, mass of pycnometer =27.144 g

According to the standards , density of pycnometer at 25°C=1.33g/cm³

Substituting the values in the formula,

volume=mass /density=27.144/1.33=20.409 cm³

Pycnometer is an instrument which is used to measure the relative density of liquids and solids.The density of liquids is determined by using relative density and for solids the density is determined by weighing them.

It is based on Boyle's law which helps in determination of pressure-volume relationship. There are 2 types of this instrument ,one that which works on a basis of gas expansion and the  other one which works on the basis of variable  volume.

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Answer:

Mass and Volume

Explanation:

The formula for density is

\(\frac{Mass}{Volume}\)

Answer:

- Water from beaker will move to the tube

Explanation:

Total percentage of water in the beaker;

\( = { \tt{100\% - 5\%}} \\ = { \tt{95\%}}\)

Total percentage of water in dialysis tube;

\({ \tt{ = 100\% - 15\%}} \\ = { \tt{85\%}}\)

So, there is much water concentration in the beaker than the dialysis tubing, this causes a determined percentage of water to diffuse to the tubing, and determined percentage of salt to move from tubing to the beaker.

Percentage of water moving to tubing;

\({ \tt{ = 95\% - 85\%}} \\ = { \tt{10\%}}\)

Percentage of salt moving from tubing to beaker

\({ \tt{ = 15\% - 5\%}} \\ { \tt{ = 10\%}}\)

When a polypeptide is being assembled, the bond that forms between a newly added amino acid and the previous amino acid in the chain is a peptide bond.

During protein synthesis, amino acids are linked together to form a polypeptide chain. The bond that forms between the carboxyl group of one amino acid and the amino group of another amino acid is called a peptide bond. This bond is formed through a dehydration synthesis reaction, also known as a condensation reaction.

In a dehydration synthesis reaction, a water molecule is removed as the peptide bond forms between the amino acids. The carboxyl group of one amino acid reacts with the amino group of another amino acid, resulting in the formation of a peptide bond and the release of a water molecule.

The peptide bond is a covalent bond and it forms a strong linkage between the adjacent amino acids in the polypeptide chain. It is responsible for the linear arrangement of amino acids in proteins. The amino acid sequence, determined by the order of peptide bonds, plays a crucial role in determining the protein's structure and function.

In summary, the bond that forms between a newly added amino acid and the previous amino acid in a polypeptide chain is a peptide bond, which is formed through a dehydration synthesis reaction.

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Answer:

is a way of presenting information about the chemical proportions of atoms

Explanation:

Answer:

9.18 L

Explanation:

When aluminum is placed in concentrated hydrochloric acid, hydrogen gas is produced. 2Al(s)+6HCl(aq)⟶2AlCl3(aq)+3H2(g) What volume of H2(g) is produced when 7.40 g Al(s) reacts at STP?

first write, then balance the equation

Al + HCl-------------> AlCl3 + H2

2Al + 6HCl-----------> 2AlCl3 + 3H2 2 MOLE  

2 moles of Al produce 3 moles of H2

Al is 7.4/27 =

0.27 moles of Al.

this will produce

0.27 X 3/2 moles of H2 =

0.41 moles of H2

PV =nRT

for STP, P = 1 atm, T = 273.2, R IS 0.082

V= (0.41) X 0.082 X 273,2/1 = 9.18 L

CHECK 1 mole of gas at STP has a volume of 22.4 L

0.41 moles then has a volume of 00.41 X 22.4L = 9.,18 L

Answer: A.

Explanation:

Brownian motion is the random motion of a particle as a result of collisions with surrounding gaseous molecules. Diffusiophoresis is the movement of a group of particles induced by a concentration gradient. This movement always flows from areas of high concentration to areas of low concentration.

Example:  The movement of pollen grains on still water. Motion of dust motes in a room (though largely influenced by air currents).

Answer:

6NO2+3H2O-------->3HNO2+3HNO3

Answer:

Melted ionic compounds

Explanation:

This is because the ions have dissociated and for electricity to pass through a substance it is important that the substance must have ions present in it.

Answer:

Kb for CH₃NH₂ (methylamine) is 4.4 × 10⁻⁴

Hope that helps.

Answer:  CaCO3 = CaO  + CO2

Explanation:

 CaCO3 = CaO  + CO2

This is balanced already.

Elem      Reactant  Products

Ca                1                  1

C                  1                   1

O                  3                  3

Answer:

207.2

Explanation:

One mole of lead weighs 207.2 g. Thus, number of moles in 454 g of lead is determined by dividing the given mass by atomic mass that is ., 2.19 moles.

Lead is 82nd element in periodic table. It is in 14th group. Lead is classified among non-metals but it is a heavy metal in nature. Lead have many naturally stable isotopes of which two are radioactive.

A substance containing 6.02 × 10²³ atoms is called its one mole. This number is called Avogadro number. Hence, one mole of every elements contains Avogadro number of atoms. The mass of one mole of an element is called its atomic mass.

Atomic mass of lead (Pb) = 207. 2 g/mol

thus, number of moles in 454 g of Pb = given mass/atomic mass

no.of moles = 454 /207.2 = 2.19 moles.

Therefore, the number of moles of Pb in 454 g is 2.19.

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Answer:

Explanation:

Start by writing water as HOH

Ca(OH)2 +CO2 = CaCO3+ HOH

Next pay attention to the CO2 going to CO3

We need an oxygen.

Fortunately that is provided by the (OH)2

Now we have

Ca(OH)2 + CO2 ==> CaCO3 + HOH

and believe it or not, that is balanced as it is

The left side has 1 Ca. So does the right side

The Left side has 1 C.  So does the right side.

The left side has 2 H. So does the right side

The left side has 2 oxygens (in Ca(OH2)) + 2 oxygens in CO2

So the equation is balanced.

Answer:

1) Hacer una pregunta con respecto al fenómeno observado: ¿Por qué se apagó la estufa mientras se cocinaba la sopa?

2) Investigar sobre el tema: Los alimentos necesitan una fuente constante de calor para cocinarse. La estufa es la fuente de calor utilizada para la cocción de alimentos, existen dos modelos de estufas: (i) combustión de gas natural, (ii) inducción eléctrica.

Las estufas por combustión de gas natural requieren de un suministro de gas y una unidad de ignición, generalmente mantienen la llama una vez garantizado el suministro de gas natural. Son los modelos más económicos y comunes, aunque son las de menor eficiencia energética.

Las estufas por inducción eléctrica utilizan la energía eléctrica como suministro, la cual es transformada en calor por medio de inductores. Son más costosas que las estufas por combustión de gas natural, pero tienen mayor eficiencia energética.

Se debe determinar que tipo de estufa posee la madre de María. No obstante, una posible causa sea la interrupción del suministro, otra por daños en algún componente (gas natural o electricidad).

3) Elaborar una hipótesis: La estufa se apagó por una interrupción  en el suministro o por daños en el sistema.

4) Se realiza un experimento:

(i) Estufa por combustión de gas natural - Se abre el suministro de gas en otra hornilla, no sale gas.

(ii) Estufa por inducción eléctrica - Se enciende otra hornilla y no se activan los inductores.

5) Análisis de datos y obtención de conclusiones - Se analiza los datos y se encuentra que no existe suministro de gas/electricidad.

6) Compartir resultados - María concluye que la estufa se apagó por interrupción en el suministro.

Explanation:

El método científico consiste en el cumplimiento de los siguientes pasos:

1) Hacer una pregunta con respecto al fenómeno observado.

2) Investigar sobre el tema.

3) Elaborar una hipótesis.

4) Se prueba una hipótesis haciendo un experimento.

5) Analizar los datos y sacar una conclusión.

6) Compartir resultados.

A continuación, representamos cada paso:

1) Hacer una pregunta con respecto al fenómeno observado: ¿Por qué se apagó la estufa mientras se cocinaba la sopa?

2) Investigar sobre el tema: Los alimentos necesitan una fuente constante de calor para cocinarse. La estufa es la fuente de calor utilizada para la cocción de alimentos, existen dos modelos de estufas: (i) combustión de gas natural, (ii) inducción eléctrica.

Las estufas por combustión de gas natural requieren de un suministro de gas y una unidad de ignición, generalmente mantienen la llama una vez garantizado el suministro de gas natural. Son los modelos más económicos y comunes, aunque son las de menor eficiencia energética.

Las estufas por inducción eléctrica utilizan la energía eléctrica como suministro, la cual es transformada en calor por medio de inductores. Son más costosas que las estufas por combustión de gas natural, pero tienen mayor eficiencia energética.

Se debe determinar que tipo de estufa posee la madre de María. No obstante, una posible causa sea la interrupción del suministro, otra por daños en algún componente (gas natural o electricidad).

3) Elaborar una hipótesis: La estufa se apagó por una interrupción  en el suministro o por daños en el sistema.

4) Se realiza un experimento:

(i) Estufa por combustión de gas natural - Se abre el suministro de gas en otra hornilla, no sale gas.

(ii) Estufa por inducción eléctrica - Se enciende otra hornilla y no se activan los inductores.

5) Análisis de datos y obtención de conclusiones - Se analiza los datos y se encuentra que no existe suministro de gas/electricidad.

6) Compartir resultados - María concluye que la estufa se apagó por interrupción en el suministro.

Answer:

A.) Longer and Shorter

Explanation:

If the wavelength of a light wave is shorter that means the frequency will be higher.

That means that longer wavelengths have a lower frequency.