(a) Given that density is usually expressed in the units of g/cm3
, calculate the density of a cube of plastic that
has a mass of 2.331 g and an edge length of 1.500 cm (volume of a cube is V = l^3).
(explain/or do density(calculate it) find volume first. then show work of density divided by volume give proper units.) (Density is a physical property of a molecule that’s measured as mass per unit volume.) (Measurement in chemistry. Think about the density of different substances. PLEASE SHOW WORK)

The condensed electron configuration of silicon (Si), element 14, is \([Ne] 3s^2 3p^2.\)

To understand the condensed electron configuration of silicon, we need to consider the electron configuration of its preceding noble gas, neon (Ne). Neon has a configuration of \(1s^2 2s^2 2p^6\) , which accounts for its 10 electrons. Moving on to silicon, we start by filling the 3s orbital, which can accommodate up to 2 electrons. This gives us \([Ne] 3s^2\). Next, we move to the 3p orbitals, which can hold a total of 6 electrons. In the case of silicon, it has 4 valence electrons in the 3p orbitals. Therefore, we add 4 electrons to the 3p orbitals, resulting in \([Ne] 3s^2 3p^2.\)

The condensed electron configuration represents the distribution of electrons in the energy levels and orbitals of an element. By following the Aufbau principle and filling the orbitals in order of increasing energy, we arrive at the condensed electron configuration for silicon, \([Ne] 3s^2 3p^2\), which highlights the noble gas core and the valence electrons in the 3s and 3p orbitals.

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When the original solution of KNO3 is cooled to 15°C, a certain amount of KNO3 will settle to the bottom of the beaker. To determine the total mass of KNO3 that settles, several factors need to be considered, such as the solubility of KNO3 at different temperatures, the initial concentration of KNO3 in the solution, and the volume of the solution. By taking these factors into account, the total mass of KNO3 that settles can be calculated using appropriate equations.

The solubility of KNO3, which is the maximum amount of KNO3 that can dissolve in a given amount of solvent, is temperature-dependent. As the temperature decreases, the solubility of KNO3 decreases. Therefore, when the solution is cooled to 15°C, some of the KNO3 will no longer remain in the dissolved state and will start to precipitate or settle at the bottom of the beaker.

To determine the total mass of KNO3 that settles, several factors need to be considered. Firstly, the initial concentration of KNO3 in the solution is important. It determines the amount of KNO3 present in the solution before cooling. Secondly, the volume of the solution also plays a role, as it affects the total amount of KNO3 that can be dissolved. Finally, the solubility of KNO3 at 15°C needs to be known.

To calculate the mass of KNO3 that settles, the amount of KNO3 remaining in the solution at 15°C needs to be determined. This can be done by subtracting the solubility of KNO3 at 15°C from the initial concentration of KNO3 in the solution. The difference represents the amount of KNO3 that has precipitated and settled. Multiplying this difference by the volume of the solution gives the total mass of KNO3 that settles to the bottom of the beaker when the solution is cooled to 15°C.

It's important to note that this calculation assumes ideal conditions and that other factors, such as impurities or the presence of other substances, may affect the solubility and precipitation of KNO3. Additionally, accurate solubility data at the specific temperature of 15°C should be consulted for precise calculations.

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Answer:

Brainliest pls

Explanation:

shows the three main types of evolution: divergent, convergent, and parallel evolution.

Divergent: tending to be different or develop in different directions.

Convergent: coming closer together, especially in characteristics or ideas.

Parallel evolution:  implies that two or more lineages have changed in similar ways

Answer:

Explanation:

what are the statments i can't help till i have the posable answers

Answer:

A. Distance = 18 m

    time = 2 hr

    speed = 9 m/hr

Explanation:

Speed is the same thing as velocity.

Velocity = distance/time

18m/2hr = 9m/hr

For choice B, the numbers are right, but the units are mixed (minutes were changed to hours)

Answer :Yet Hooke was perhaps the single greatest experimental scientist of the  describing elasticity that is still used today ("Hooke's Law"); assisted Robert Boyle the history of biology largely rests on his book Micrographia, published in 1665.  than his compound microscope, but found simple microscopes difficult to use: he

Explanation: think you

The correct equation would be: AgNO3 + NaCl → AgCl↓ + NaNO3. The ↓ symbol indicates the formation of a precipitate.

In order to determine whether the given equations for precipitation reactions are correct or not, we need to follow certain rules and principles. A precipitation reaction occurs when two aqueous solutions are mixed and a solid product is formed. The solid product is called a precipitate and is insoluble in water.
The first step is to identify the reactants and products in each equation. Then we need to check if the products formed are soluble or insoluble in water. If the products are soluble, then no precipitation reaction occurs. However, if the products are insoluble, then a precipitation reaction occurs and a solid product (precipitate) is formed.
For example, let's consider the equation:
AgNO3 + NaCl → AgCl + NaNO3
Here, the reactants are AgNO3 and NaCl, and the products are AgCl and NaNO3. AgCl is insoluble in water, so a precipitation reaction occurs.
Similarly, we can check the correctness of other equations and write the correct equations if necessary.

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There are 1103.014 grams in 8.100 g-mol of calcium sulfate.

To calculate the grams in 8.100 g-mol of calcium sulfate, we need to determine the molar mass of calcium sulfate (CaSO₄) first. The molar mass is calculated by adding up the atomic masses of each element in the compound.

Calcium (Ca) has an atomic mass of 40.08 g/mol, sulfur (S) has an atomic mass of 32.07 g/mol, and oxygen (O) has an atomic mass of 16.00 g/mol.

The molar mass of calcium sulfate (CaSO₄) is therefore calculated as:
(1 * 40.08) + (1 * 32.07) + (4 * 16.00) = 136.14 g/mol.

Now we can calculate the grams in 8.100 g-mol of calcium sulfate using the following formula:
grams = molar mass * moles.

Plugging in the values:

grams = 136.14 g/mol * 8.100 g-mol = 1103.014 g.

Therefore, there are 1103.014 grams in 8.100 g-mol of calcium sulfate.

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The thick soil accumulation of fine-grained particles is called as silt

Answer:       freezing

Explanation:

when the atoms or molecules in a solid or liquid are moving slower and closer together, it is called brrrrrrrrr freezinf

Ka = [Cl3CCOO⁻] [H⁺] / [Cl3CCOOH] = 0.3

Ka = [C6H5 -NH2] [H30⁺] / [C6H5-NH3⁺] = 2.51ₓ10⁻⁵

Ka = [Cu (OH3)] ⁻[H⁺] ³/[Cu²⁺] = 3ₓ10⁻⁸

To know if a substance will act as an acid or a base in a reaction, we look at the functional group.

How to find acidic strength?

trichloroacetic acid (and carboxylic acids in general) have carboxylic group - O- H which dissociates into aqueous solution into COO⁻ + H+ ions. Since it gives protons in aqueous solution, it acts as an acid

Amines Ar -NH are bases. They react with water to produce hydroxide ions.

Protonated amine is the conjugate acid. It reacts with water to provide

Cu2+ reacts with water to provide protons. Hence, Cu2+ acts as an acid.

Among trichloroacetic acid, anilinium ion and Cu2+ ion, Ka value is maximum for trichloroacetic acid. Hence, trichloroacetic acid is the strongest acid.

Note: Higher is the Ka value, greater is the acid strength.

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Answer:

Chlorofluorocarbons and hydrochlorofluorocarbons are fully or partly halogenated paraffin hydrocarbons that contain only carbon, hydrogen, chlorine, and fluorine, produced as volatile derivative of methane, ethane, and propane. They are also commonly known by the DuPont brand name Freon.

Explanation:

Answer:

Explanation: Chlorofluorocarbons and hydrochlorofluorocarbons are fully or partly halogenated paraffin hydrocarbons that contain only carbon, hydrogen, chlorine, and fluorine, produced as volatile derivative of methane, ethane, and propane. They are also commonly known by the DuPont brand name Freon

Answer:

I think D

Explanation:

it has both H and G in the planes.

Answer:

La Convención Marco de las Naciones Unidas sobre el Cambio Climático (CMNUCC) en su Artículo 1, lo define como ‘un cambio de clima atribuido directa o indirectamente a la actividad humana que altera la composición de la atmósfera mundial y que se suma a la variabilidad natural del clima observada durante períodos de tiempo comparables’. La CMNUCC distingue entre ‘cambio climático’ atribuido a actividades humanas que alteran la composición atmosférica y ‘variabilidad climática’ atribuida a causas naturales.

Los científicos han encontrado evidencias de que el clima en el planeta está cambiando a un ritmo más acelerado de lo esperado y que nuestras actividades ligadas a la producción, extracción, asentamiento y consumo, son la principal causa de este aceleramiento en el cambio.

El mayor problema de un cambio acelerado en el clima es que nuestras sociedades no están preparadas para asumir los cambios que esto nos pueda traer: derretimiento de las masas glaciares y nevados que abastecen acueductos, cambios en los ciclos de floración y fructificación de las plantas de cultivo, ascensos en el nivel de los mares donde hay mucha población viviendo, mayor ocurrencia y fuerza en lluvias, sequías, huracanes, heladas y granizadas en áreas urbanas y rurales, entre otros fenómenos que sin duda reducen nuestra calidad de vida.

Explanation:

espero te áyude

The reaction taking place between propyl magnesium bromide and benzaldehyde is Grignard reaction. The product obtained is an alcohol.

An organometallic chemical reaction in which an alkyl, aryl, allyl or aryl magnesium halides reacts with the carbonyl group of aldehyde or ketone is known as Grignard reaction.

The reaction of CH₃CH₂CH₂MgBr and C₆H₅CHO is given below.

In this reaction, propyl magnesium bromide acts as a Grignard reagent which reacts with the benzaldehyde to form alcohol as the product in the presence of dilute aqueous acid.

This type of reaction is important for the formation of C-C bonds.

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Answer:

ldk

Explanation:

ldk

Answer:

Explanation:

Since the temperature of the gas is constant , we use Boyle's law formula

P₁ V₁ = P₂ V₂

P₁ = 2.5  x 10⁵ Pa

V₁ = 250 x 10⁻⁶ m³

V₂ = 3.5 x 10⁻³m³

P₂ = ?

Putting the values in the equation

2.5  x 10⁵ x 250 x 10⁻⁶ = 3.5 x 10⁻³ P₂

P₂ = 2.5  x 25 / 3.5 x 10⁻³

= 17.86 x 10³ Pa

= .1786 x 10⁵ Pa

= .1786 x 10⁵ / 1.013 x 10⁵ atm

= .176 atm

Answer:

156.78 °C

Explanation:

First we convert 9.8 grams of NH₃ into moles, using its molar mass:

Then we can use the PV=nRT formula to calculate the temperature, where:

We input the data:

And solve for T:

Finally we convert 429.94 K to °C:

Answer:

what is cell wall?

A cell wall is a layer located outside the cell membrane found in plants, fungi, bacteria, algae, and archaea

where is it found

They are found in bacteria, archaea, fungi, plants, and algae.

I want Brainliest plz!!

Answer:

The cell wall is the protective, semi-permeable outer layer of a plant cell. A cell wall is a fairly rigid layer surrounding a cell located outside of the plasma membrane that provides additional support and protection.

Answer:

(5.50) ( 6.02 *10^23)

Explanation:

The number of molecules equals the number of moles times Avagadro's number.

Distillation is the separation of multiple liquids. it means the selective boiling and subsequent condensation of a component in a liquid mixture.

Distillation It is a separate technique that can be used either to increase the concentration of a particular component in a mixture or to obtain pure components from a mixture.

The process of distillation takes advantage of the difference in boiling points of the components in a liquid mixture by converting one of them into a gaseous state. Distillation is not a chemical reaction but can be considered a physical separation process.

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Volume = 5x3x10 = 150 cm cubed

Mass = 150x100 = 15000 grams

Density = 15000/150 = 100g/cm cubed

The density of that substance will always be the same. if you cut the object into a million pieces, they would still each have the same density.

Because a material that dilates takes up a larger volume, its density decreases. This occurrence occurs in pieces in all forms of matter: for example, solids, liquids, and gases. The size, mass, and disposition of atoms affect the density of a substance.

The density of an object can convert if either the mass or volume of the object is changed. This means that the density of the general object will decrease and be more likely to float.

So we can conclude that The density of a liquid is a computation of how heavy it is for the amount measured.

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The best thing Ka can do next to determine the objectivity of the source is conduct an internet search for cardiac problems + omega-3 fats. Thus option C is correct.

Cardiac problems are defined as the problems that occurs in heart and blood vassals of heart.

The common cardiac problems are

A significant family of polyunsaturated fats is the omega-3 family.

Thus, the best thing Ka can do next to determine the objectivity of the source is conduct an internet search for cardiac problems + omega-3 fats. Thus option C is correct.  

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Answer:

it is A.

Explanation:

determine whether the evidence cited reflects more than one side

The resulting pH of the solution formed by adding 200 ml of 0.30 M formic acid to 400 ml of water, with a pKa of 3.75, is approximately 2.3.

To determine the resulting pH of the solution, we need to consider the dissociation of formic acid (HCOOH) in water. Formic acid is a weak acid that partially dissociates into hydrogen ions (H⁺) and formate ions (HCOO⁻). The dissociation constant of formic acid is represented by pKa, which is equal to -log(Ka), where Ka is the acid dissociation constant.

Given the pKa of formic acid as 3.75, we can use the Henderson-Hasselbalch equation to calculate the pH:

pH = pKa + log([A⁻]/[HA])

In this case, [A⁻] represents the concentration of the formate ions and [HA] represents the concentration of the undissociated formic acid. The total volume of the resulting solution is 200 ml + 400 ml = 600 ml.

Using the given concentration of 0.30 M formic acid, we can calculate the concentration of formate ions ([A⁻]) and undissociated formic acid ([HA]):

[HA] = concentration of formic acid = 0.30 M x (200 ml/600 ml) = 0.10 M

[A⁻] = concentration of formate ions = 0.30 M x (400 ml/600 ml) = 0.20 M

Substituting these values into the Henderson-Hasselbalch equation:

pH = 3.75 + log(0.20/0.10) = 2.3 (rounded to one decimal place)

Therefore, the resulting pH of the solution is approximately 2.3 when 200 ml of 0.30 M formic acid is added to 400 ml of water with a pKa of 3.75.

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Complete Question:

if 200ml of 0.30M formic acid is added to 400 ml of water, what is the resulting PH of the solution? round the answer to one decimal place Pka 3.75

The correct option is (d) Carbon Dioxide.

Explanation:

The density of air is around 1.2 g/L, which means that any gas with a density above this value is more dense than air.

Carbon dioxide has a density of approximately 1.98 g/L, which is considerably more dense than air (composed of nitrogen and oxygen).

As a result, if a gas sample is determined to be more dense than air, it is likely to be carbon dioxide (CO2), which has a molecular weight of 44 g/mol.

Carbon dioxide is produced in the laboratory by many chemical reactions and is commonly employed in the food and beverage industries, such as carbonating soda and beer.

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The options that are correct are;

A. Readers can compare relative amounts of each type of renewable energy.

C. Readers get a quick visual on how each type of renewable energy contributes to the whole

One may quickly grasp how each source contributes to the energy consumption that is renewable and how efficient each one is by looking at the pie chart with each stated percentage consumption of each renewable energy source.

The largest percentage, for instance, is 48% for biomass. We may imagine biomass as being the most dominating renewable energy source and one which will have the biggest relative amount of renewable energy used compared to the others, even though we don't know the precise amount consumed in kilojoules.

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