PLEASE HELP PLEASE LLEASE HELP, WILL MARK BRAINLIEST!!!

Which of the following elements will NOT reach an octet when in a bond?

Respuesta:

Las fuerzas intermoleculares que actúan entre las moléculas se clasifican en : Dipolos permanentes. Dipolos inducidos. Dipolos dispersos.

Explicación:

Dentro de una molécula, los átomos están unidos mediante fuerzas intramoleculares (enlaces iónicos, metálicos o covalentes, principalmente). Estas son las fuerzas que se deben vencer para que se produzca un cambio químico. Son estas fuerzas, por tanto, las que determinan las propiedades químicas de las sustancias.

Sin embargo existen otras fuerzas intermoleculares que actúan sobre distintas moléculas o iones y que hacen que éstos se atraigan o se repelan. Estas fuerzas son las que determinan las propiedades físicas de las sustancias como, por ejemplo, el estado de agregación, el punto de fusión y de ebullición, la solubilidad, la tensión superficial, la densidad, etc.

Answer:

C. Grinding the solute down into tiny particles.

Explanation:

The dissolution of a solute has something to do with particle size. The size of solute particles usually determines how quickly a solute dissolves in a solvent. When large solute particles are introduced into the solvent, the large solute particles do not easily interact with solvent particles hence preventing easy dissolution in the solvent.

However, when the solute is ground into tiny particles, smaller solute particles interact more effectively with solvent particles hence dissolution is faster.

Therefore, tiny solute particles will dissolve faster in a solvent than a lump of solute. Summarily, small particle size enhances dissolution of a solute in the appropriate solvent.

Answer: stirring the solution vigorously

Grinding the solute down into tiny particles

gently heating the solution

Explanation:

A dissolution will proceed more readily when heated . Breaking up the solute as much as possible will aid in overcoming the solute-solute interaction, as will stirring the solution

The temperature of the gas in Kelvin, after its volume is reduced to 2,450 mL, is approximately 143.27 K.

To determine the temperature of the gas in Kelvin after its volume is reduced, we can use the combined gas law, which relates the initial and final conditions of pressure, volume, and temperature for a given amount of gas.

The combined gas law equation is:

(P₁ * V₁) / T₁ = (P₂ * V₂) / T₂

Where P₁ and P₂ are the initial and final pressures, V₁ and V₂ are the initial and final volumes, T₁ is the initial temperature in Kelvin, and T₂ is the final temperature in Kelvin.

Given that the initial volume V₁ is 3,480 mL, the initial temperature T₁ is -70.0 °C (which needs to be converted to Kelvin), and the final volume V₂ is 2,450 mL, we can substitute these values into the equation.

To convert -70.0 °C to Kelvin, we add 273.15 to it, resulting in T₁ = 203.15 K.

Now we can solve for T₂:

(T₂ * V₁) / T₁ = V₂

T₂ = (V₂ * T₁) / V₁ = (2,450 mL * 203.15 K) / 3,480 mL

Simplifying the equation, we find:

T₂ ≈ 143.27 K

Therefore, the temperature of the gas in Kelvin, after its volume is reduced to 2,450 mL, is approximately 143.27 K.

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Radiologists are medical doctors that treat injuries using medical imaging (radiology)

Answer:

a person who uses X-rays or other high-energy radiation, especially a doctor specializing in radiology.

Explanation:

A leather jacket and printer paper are examples of items that can be made from renewable resources, while plastic forks, metal cans, and electronics are not considered renewable due to their reliance on non-renewable materials and processes. Option  C, E

The two correct answers that are made from renewable resources are:

C) Leather jacket: Leather is derived from animal hides, which are a byproduct of the meat industry. As long as there is a sustainable and responsible approach to animal farming, the production of leather can be considered renewable. The hides are obtained from animals that are raised for meat consumption, and their use in leather production helps reduce waste.

E) Printer paper: Printer paper can be made from various sources, including trees, bamboo, and recycled paper fibers. If the paper is sourced from sustainably managed forests or from fast-growing plants like bamboo, it can be considered renewable. Additionally, the use of recycled paper fibers reduces the demand for materials and promotes a more circular economy.

The other options, A) plastic fork, B) metal can, and D) electronics, are not made from renewable resources:

A) Plastic fork: Plastics are typically derived from fossil fuels, which are non-renewable resources. The production of plastic involves the extraction and processing of petroleum or natural gas, both of which are finite resources.

B) Metal can: Metal cans are predominantly made from aluminum or steel. While these metals can be recycled, their initial production requires the extraction of raw materials from the Earth, which is not a renewable process.

D) Electronics: Electronics are made from a wide range of materials, including metals, plastics, and various chemical compounds. The production of electronics involves the extraction of raw materials, many of which are non-renewable resources.

Option C and E.

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The United States did not want to spend money on the introduction of metric system because it is costly and waste of time.

In 1866, the United States Congress authorized the use of the metric system in the country and about a decade later America became one of  signatory nations to the Treaty of the Meter. The biggest reasons the  United States hasn't adopted the metric system are due to time and money. When the Industrial Revolution began in the country, expensive manufacturing industries became a main source of American jobs and consumer products so the United States did not want to spend money on the introduction of metric system. About two years later, Congressman Fred Albert Britten of Illinois introduced a metric-standards bill. In the bill, the idea was to keep the American standard names for units of measure and adjust their amounts to equal their closest metric system.

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Answer:

If the dad has brown eyes, and the mom has blue eyes, then the kid will have blue eyes. If the dad has blue eyes and the mom has brown eyes, the kid will have brown eyes.

Explanation:

Answer: what the person above me said

Explanation:

We gain oxygen from trees through the process of photosynthesis. Photosynthesis is the biochemical process in which green plants, including trees, use sunlight, water, and carbon dioxide to produce oxygen and glucose (a form of sugar).

Trees have specialized cells called chloroplasts, which contain a pigment called chlorophyll. Chlorophyll absorbs sunlight energy.

The tree's leaves capture sunlight and use it to convert carbon dioxide (CO2) from the air and water (H2O) from the roots into glucose (C6H12O6) and oxygen (O2).

During photosynthesis, the chlorophyll in the chloroplasts helps to split water molecules into hydrogen ions (H+) and oxygen atoms (O). The oxygen atoms then combine to form O2 molecules.

The oxygen produced during photosynthesis is released into the atmosphere through tiny pores called stomata found on the surface of the tree's leaves. From there, it mixes with the surrounding air and becomes available for us to breathe.

In summary, trees produce oxygen as a byproduct of photosynthesis. They play a crucial role in maintaining the balance of oxygen and carbon dioxide in the atmosphere, providing us with the oxygen we need for respiration.

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The eutectic point is the lowest temperature at which the liquid phase is constant at a particular pressure.

A melting composition known as a eutectic consists of at least two components that melt and freeze at the same rates. The components combine during the crystallisation phase, operating as a single component as a result.

The eutectic is the system's lowest melting point under its own pressure; it has a matching temperature called the eutectic temperature and produces the eutectic liquid as a result. In terms of composition, eutectic liquids are located between the system's solid phases.

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Answer:

V = 93.0 L

Explanation:

Hello!

In this case, when computing the PVT properties for an ideal gas, we need to use the following equation:

\(PV=nRT\)

In such a way, for 2.5 x 10²⁴ molecules of chlorine at STP (273.15 K and 1.00 atm) we first need the moles based on the Avogadro's number:

\(n = 2.5x10^{24}molec*\frac{1mol}{6.022x10^{23}molec} = 4.15mol\)

Now, we solve for volume on the ideal gas equation to obtain:

\(V=\frac{nRT}{P}\)

So we plug in and get:

\(V=\frac{4.15mol**0.08206\frac{atm*L}{mol*K}*273.15K}{1.00atm}\\\\V=93.0L\)

Best regards!

The density (in g/cm³) of a cube of metal that is 2 inches on a side and weighs 444.5 grams is 3.4 g/cm³ (1st option)

First, we shall obtain the volume of the metal. Details below:

Volume = L³

Volume = 5.08³

Volume = 131.1 cm³

Finally, we shall obtain the density of the metal. Details below:

Density = mass / volume

Density of metal = 444.5 / 131.1

Density of metal = 3.4 g/cm³

Thus, we can conclude from the above calculation that the density of the metal is 3.4 g/cm³ (1st option)

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Complete question:

What is the density (in g/cm³) of a cube of metal that is 2 inches on a side and weighs 444.5 grams?

3.4 g/cm³

8.89 g/cm³

55.56 g/cm³

0.180 g/cm³

Explanation:

here's the answer to your question

Answer:

a. is the correct answer

Explanation:

Answer:

C. 2.70 g/mL

Explanation:

Density is the ratio between the mass of a substance and the volume it occupies. Based on Archimedes' volume, the displaced volume of the aluminium is the volume it occupies. To solve this question we must find the difference in volume between initial volume of water = 30mL and final volume of water + aluminium = 39.26mL. This difference is the volume of the aluminium. With its mass we can find density:

39.26mL - 30mL = 9.26mL

Density = 25.00g / 9.26mL =

2.70g/mL

Right answer is:

A carbocation intermediate is created when the pi electrons take a hydrogen from H2SO4.

An E1 reaction and a racemic product are the results of this. A racemic product usually favors the more stable trans diastereomer. H2SO4 will function as a catalyst since it is regenerated, which restarts the process.

Data indicate that water is the best solvent for achieving the best saturation and recrystallization of benzoic acid. This is partly because water is a polar molecule with features that enable carboxylic acid groups, like the one in benzoic acid, to dissociate and give protons to the water.

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Answer:

Equation 1 - nuclear fission

Equation 2 - nuclear fusion

Explanation:

Nuclear fission is a reaction in which a large nucleus is split into smaller nuclei when it is bombarded by neutrons. The process produces more neutrons to continue the chain reaction. This is clearly depicted in equation 1 as shown in the question.

Nuclear fusion is a reaction in which two light nuclei combine in order to form a larger nuclei. This is clearly depicted in equation 2 as shown in the question.

In the first reaction, a neutron is released, and in the second a helium atom is released. The given two equations represent nuclear fission and fusion.

A nuclear reaction is a reaction that involves the nuclei of the atom and the absorption and release of energy. In the first reaction, a big nucleus is split by the neutron bombardment into smaller nuclei.

In the second reaction the process of nuclear fusion, two nuclei combine into a single larger nucleus that is shown as:

₁¹H+ ²₁H → ³₂He

Therefore, nuclear fission and fusion are represented by each of these equations.

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Remember that

#1

Carbon is present so it's covalent

#2

#3

#4

#5

The electronegative value of Potassium is 0.8 Pauling units

This is the tendency or strength which an atom attracts or pulls a shared electron in a covalent bond.

The electronegative value of an element is basically the strength or affinity towards electrons of other atoms and it follows a trend in the periodic table which is it increases across the period and decreases down the group.

In the given question, we have an element with electron configuration 2, 8, 8, 1. Sum this up and we would get the atomic number of the element.

\(2+8+8+1=19\)

The element with an atomic number of 19 is potassium which belongs to group (i) and they're primarily consisted of metals with high electro-positivity which tends to make their electron affinity lower and they generally have smaller or lower electronegative value.

Using the periodic table, we would easily see that the electronegative value of Potassium is 0.8 Pauling units.

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Explanation:

Force=mass *acceleration

F=300*5

f

F=1500N

Answer:

when placed in water, a sodium pellet catches on fire as hydrogen gas is liberated and sodium hydroxide forms. chemical change = fire is a sign of chemical reaction.

Explanation:

When placed in water the sodium pellets catch the fire and liberate the hydrogen gas. On mixing with water solid sodium forms a colorless basic solution.

Sodium is a soft metal. It is a very reactive element with a low melting point. Sodium reacts very quickly with water, snow, and ice to produce sodium hydroxide and hydrogen. It is an alkali metal and the sixth most abundant metal on earth. It has a silvery white color.

It has a strong metallic luster. On reacting with oxygen it produces sodium oxide which on reacting with the water produces sodium hydroxide.

It is used to improve the structure of certain alloys and soaps. It is also used in the purification of metals. Sodium is also present in sodium chloride, an important compound found in the environment.

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The mass of water that should be produced from 54.8 L of hydrogen gas in the presence of excess oxygen at STP should be 36 grams.

The equation when hydrogen and oxygen gas combine to form water is written as:

\(2H_2 + O_2 -- > 2 H_2O\)

From the equation of the reaction, the ratio of hydrogen gas that reacts to the water that is formed is 1:1.

At STP, 1 mole of a gas is equivalent to 22.4 L of the gas. Thus, 54.8 L of hydrogen will be equivalent to:

22.4 L = 1 mol

54.8 L = 54.8 x 1/22.4

            = 2 mol

With moles of hydrogen gas, 2 moles of water will also be formed.

Recall that: mass = mole x molar mass

The molar mass of water is 18 g/mol.

Thus, the mass of 2 moles of water can be calculated as:

Mass = 2 x 18

         = 36 grams

Thus, 36 grams of water will be formed when 65.8 L of hydrogen gas reacts with excess oxygen.

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According to the given reaction, the reaction is a decomposition reaction, this is because a substance (CuCO₃) is broken down to simpler molecules.

To balance it we have to pay attention to subscripts and coefficients that indicate the number of atoms and molecules respectively.

For example, in CuCO3, there is one atom of copper (reactants) and in CuO there is also one atom of copper (products). It means that the copper is already balanced.

There is one atom of carbon in the reactants and one of them in the products, the carbon is also balanced.

There are 3 atoms of oxygen in the reactants and 1+2 of them in the products (CuO and CO₂). The oxygen is balanced too.

It means that the equation is already balanced and the coefficients of all molecules should be 1, but remember this is redundant so you just have to leave the equation just as it is.

Answer:

i think 2 figure ..............

Answer: 3

Explanation:

The final water reading in the graduated cylinder if the density of copper is 8.96 g/mL is 16.79mL

Density is defined as mass per unit volume. Density and volume have a directly proportional relationship. That is, any change in volume causes a change in density and vice versa.

Find the final water reading in the graduated cylinder

\(D=\frac{M}{V}\)

where,

D= density

M= mass

V= volume

volume due to copper pieces

V= M/D

V=12.91g/8.96

 =1.440

find volume = original volume + displaced volume

                    = 15.35 + 1.440

                    = 16.79mL

The final water reading in the graduated cylinder if the density of copper is 8.96 g/mL is 16.79mL

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Answer:

X. 80°

Explanation:

if the substance is below -38 then it is in the solid phase (-100° and -50°) and if it is above 356° it is a gas (375°). Therefore anything in the middle is a liquid, 80°.

Given that the substance freezes at  –38°C and boils at 356°C, it will be a liquid at  a temperature of 80°C.

The term liqiid range refers to the temperatire range within which a substance remains in its liquid state. Now we are told that the substance freezes at –38°C and boils at 356°C.

Hence, we expect that this substance will be in the liquid state at a temperature of 80°C.

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Answer: F=mxa, m=F/a, a=F/m .

Explanation: HOPE IT HELPS YOU .

Answer: C

Explanation: it's the most logical one and if he eats off the ceramic ones then he saves the paper ones

9. The number of mole of the argon contained in the tank is 2.39 moles

10. The volume (in liters) of H₂O produced from the reaction is 73.5 liters

The number of mole of the argon contained in the tank can be obtained as follow:

PV = nRT

Inputting the given parameters, we have:

9.4 × 6.25 = n × 0.0821 × 299

Divide both sides by (0.0821 × 299)

n = (9.4 × 6.25) / (0.0821 × 299)

n = 2.39 moles

Thus, the number of mole of the argon gas in the tank is 2.39 moles

The volume of H₂O produced can be obtained as shown below:

4NH₃(g) + 5O₂(g) -> 6H₂O(g) + 4NO(g)

From the balanced equation above,

4 liters of NH₃ reacted to produced 6 liters of H₂O

Therefore,

49 liters of NH₃ will react to produce = (49 × 6) / 4 = 73.5 liters of H₂O

Thus, the volume of H₂O produced is 73.5 liters

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