The chemical name for common salt is​

Halogens are found in nature only in compounds because they are highly reactive and have a strong tendency to react with other elements to form compounds.

Halogens are a group of elements that are highly reactive, and they are located in Group 17 (VIIA) of the periodic table. These elements are fluorine (F), chlorine (Cl), bromine (Br), iodine (I), and astatine (At).

The name halogen comes from the Greek word halos, which means "salt" and "producer."Halogens are very reactive because they have seven valence electrons in their outermost shell. These electrons make halogens highly reactive and prone to bond with other elements. This means that they have a strong tendency to react with other elements to form compounds.

These compounds are formed through a process called halogenation or halogenation reaction. This process involves the addition of halogen atoms to a molecule or compound to form a halogenated compound.

In conclusion, halogens are found in nature only in compounds because of their highly reactive nature and their strong tendency to react with other elements to form compounds.

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If you have 10 kg each of a radioactive sample a with a half-life of 100 years, and another sample b with a half-life of 1000 years, sample A has a higher decay constant and higher activity.

The activity of a radioactive sample refers to the number of decays occurring per unit time. It is measured in units of becquerels (Bq) or curies (Ci). The activity of a sample is proportional to the number of radioactive nuclei present in the sample.

The decay rate of a radioactive sample is determined by its half-life. The shorter the half-life, the higher the decay rate and the higher the activity. Therefore, sample A with a half-life of 100 years will have a higher decay rate and higher activity than sample B with a half-life of 1000 years.

To calculate the activity of a sample, we use the following formula

Activity = λN

where λ is the decay constant, and N is the number of radioactive nuclei present in the sample.

Since the two samples have the same mass, the number of radioactive nuclei will be the same. Therefore, the sample with the higher decay constant (λ) will have the higher activity.

The decay constant is related to the half-life by the following formula:

λ = ln(2) / \(t^{\frac{1}{2} }\)

where ln(2) is the natural logarithm of 2, and \(t^{\frac{1}{2} }\) is the half-life.

Using this formula, we can calculate the decay constants for samples A and B

\(\lambda_{A}\)= ln(2) / 100 years = 0.00693 per year

\(\lambda_{B}\) = ln(2) / 1000 years = 0.000693 per year

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The number of moles of ammonia produced will be: n(NH3) = 2/3 × n(H2) = 2/3 × 1.85 mol = 1.23 molHence, the number of moles of ammonia that can be produced from the reaction of 4.0 liters of hydrogen at 50.0°C and 1.2atm of pressure with excess nitrogen is 1.23 moles.

The reaction between hydrogen and nitrogen gas produces ammonia. The balanced chemical equation is given below: N2(g) + 3H2(g) → 2NH3(g)The number of moles of a gas can be calculated by using the ideal gas law which is PV = nRT, where P is pressure, V is volume, n is the number of moles, R is the ideal gas constant, and T is temperature.The conditions of the reaction are: Volume of hydrogen, V = 4.0 L Pressure of hydrogen, P = 1.2 atm Temperature of hydrogen, T = 50.0°CThe temperature must be converted from Celsius to Kelvin by adding 273.15 to it: T = 50.0 + 273.15 = 323.15 K The pressure must also be converted to units of Pascals (Pa) since the gas constant has units of J/(mol·K): P = 1.2 atm × 101325 Pa/atm = 121590 PaNow we can calculate the number of moles of hydrogen gas: n = PV/RT = (121590 Pa × 4.0 L)/(8.314 J/(mol·K) × 323.15 K) ≈ 1.85 molesSince there is an excess of nitrogen gas, all of the hydrogen gas will react to form ammonia. From the balanced equation, we see that 3 moles of hydrogen gas are required to produce 2 moles of ammonia.

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The fluid referred to in the question is likely amniotic fluid, which surrounds the developing fetus in the womb. Amniotic fluid can be a valuable source of information for studying fetal development.

For example, abnormal levels of certain substances in the fluid can indicate a problem with fetal development. Additionally, genetic testing can be performed on cells that are shed by the fetus into the amniotic fluid. While amniotic fluid analysis can provide important insights into fetal development, it is not without its limitations. For example, the amount of fluid and the composition of the fluid can vary greatly among pregnancies, which can make it difficult to draw definitive conclusions from the results. Additionally, the procedure for collecting amniotic fluid (amniocentesis) carries a small risk of complications such as infection or miscarriage. Overall, studies on amniotic fluid can be an important tool for identifying potential problems in fetal development, but it is important to carefully weigh the potential benefits and risks of this procedure on a case-by-case basis.

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helium is in group 8 and period 1

Answer:

sa gutan ko na nga para mabrainliest na sya

The mechanism of the polymerization reaction, more precisely the characteristics of the monomer and the reaction circumstances, can be used to explain why phenyl groups in linear polystyrene are bonded to alternate, not neighbouring, carbons of the polymer chain.

Styrene (C8H8), a vinyl monomer, is used in the polymerization step that creates polystyrene. A free radical initiator is often employed to start the reaction and spread the growth of the polymer chain in a conventional free radical mechanism. Each styrene monomer's vinyl group (CH=CH2) adds to the vinyl group of another styrene monomer throughout the polymerization process. As a result, a linear chain of repeating units connected by covalent bonds is created. The vinyl group of the styrene monomer is joined to the phenyl group (C6H5) in the case of polystyrene. As a result, during the polymerization process, the phenyl group is absorbed into the polymer chain. The phenyl groups in the polystyrene chain are situated at alternate carbons because they are joined to the vinyl group, which is situated at a different carbon in the styrene monomer. This is due to the head-to-tail nature of the polymerization reaction, in which the vinyl group of one monomer combines with the vinyl group of another monomer in a way that causes the phenyl groups to be arranged along the polymer chain in an alternating pattern. Consequently, in linear polystyrene, the location of the phenyl groups is a result of the styrene monomer's makeup and the polymerization reaction's process.

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Answer:

b

Explanation:

Answer:

6. 53 is the answer. Hope this helps:)

The number of d electrons that an atom of atomic number 53 possess are 20. Thus, the correct option for this question is 5.

An atomic number may be defined as the number of protons in the nucleus of an atom that significantly represents the characteristic of a chemical element and determines its specific place in the modern periodic table.

According to the modern periodic table, an element that has an atomic number of 53 is known as Iodine. Its electronic configuration is \(1s^2, 2s^2, 2p^6, 3s^2, 3p^6, 4s^2, 3d^1^0, 4p^6, 5s^2, 4d^1^0, 5p^5\). Thus, according to this electronic configuration, the total number of d electrons are \(3d^1^0 and 4d^1^0\).

Therefore, the number of d electrons that an atom of atomic number 53 possess are 20. Thus, the correct option for this question is 5.

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Acids separate into ions in water or other aqueous solutions. These are in charge of how electricity conducts through them. In the absence of water, acids do not dissociate hydrogen ions. We can therefore state that acids exclusively create ions in watery solutions.

The polar H-A bond breaks due to the attraction between H and the O of water

An aqueous solution is one in which water serves as the solvent. Chemical equations typically illustrate it by adding (aq) to the appropriate chemical formula. For instance, Na +(aq) + Cl might be used to indicate a solution of table salt, or sodium chloride (NaCl), in water (aq).

Aqueous solutions are those in which water serves as the solvent. Even though water is a great solvent, not everything readily dissolves in it.

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As sedimentary rocks are formed from the accumulation of sediment, fossils can be buried and preserved over time, leading to the formation of fossil-rich sedimentary rocks.

What is Fossils?

Fossils are the remains or traces of prehistoric plants, animals, and other organisms that are preserved in rocks. Fossils provide valuable insights into the evolution of life on Earth, as they can help scientists to understand the types of organisms that lived in the past, how they evolved, and how they interacted with their environment.

Rocks that form from lava, such as igneous rocks, typically do not contain fossils because the high temperatures involved in the formation of lava can destroy organic matter, including the remains of plants and animals.

When lava flows onto the surface of the Earth, it can quickly cool and solidify, forming an igneous rock. This rapid cooling process does not allow for the preservation of any organic material that might have been present in the lava, including fossils.

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The attraction of a metallic cation for delocalized electrons is known as "metallic bonding".

This type of bonding occurs when the valence electrons of the metal atoms become delocalized and form a "sea of electrons" that all the metal cations are able to move around in. This movement of electrons allows the metal cations to have electrostatic interactions with each other, leading to strong bonding.

The attraction of a metallic cation for delocalized electrons is known as metallic bonding.Metallic bonding refers to the bonding between metallic atoms. The valence electrons of the metallic atoms, in this case, are free to move throughout the entire crystal, creating a “sea” of electrons.

The positively charged metallic ions are then held together by this sea of electrons. The attraction between the positively charged metal ions and the negatively charged electron sea is known as metallic bonding.In metallic bonding, the valence electrons are delocalized and shared between many atoms, resulting in strong bonds.

These electrons are free to move throughout the metal lattice, resulting in high electrical and thermal conductivity as well as malleability and ductility. Metals also have high melting and boiling points, which is also a result of the strong metallic bonds between the atoms.

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The osmolarity (osm) of a 0.5 M NaCl solution is 1 osm.

Osmolarity can be calculated by multiplying the molarity of the solution by the number of solute particles in the solution.

Next, we can CALCULATE the osmolarity of the solution using the formula:
osmolarity (osm) = molarity (M) x number of solute particles

osmolarity (osm) = 0.5 M x 2
osmolarity (osm) = 1 osm

Therefore, the osmolarity of a 0.5 M NaCl solution is 1 osm.

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The approximately 4 moles of gas in the container at standard temperature (ST) with a volume of 99.2 L.

To determine the number of moles of gas in a container at standard temperature (ST) with a volume of 99.2 L, we need to use the ideal gas law equation:

PV = nRT

Where:

P = pressure (atmospheres)

V = volume (liters)

n = number of moles

R = ideal gas constant (0.0821 L·atm/mol·K)

T = temperature (Kelvin)

At standard temperature (ST), the temperature is 273.15 K.

Assuming the pressure is also at standard conditions (1 atm), we can rearrange the ideal gas law equation to solve for the number of moles:

n = PV / RT

Substituting the given values:

P = 1 atm

V = 99.2 L

R = 0.0821 L·atm/mol·K

T = 273.15 K

n = (1 atm) × (99.2 L) / ((0.0821 L·atm/mol·K) × (273.15 K))

Simplifying the calculation:

n ≈ 4 moles

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The solubility of a gas in a liquid under different pressures can be calculated using Henry's Law.

The solubility of a gas in a liquid under different pressures can be calculated using Henry's Law, which describes the relationship between the pressure of a gas and its solubility in a liquid. According to Henry's Law, at a constant temperature, the solubility (S) of a gas in a liquid is directly proportional to the partial pressure (P) of the gas above the liquid.

Mathematically, Henry's Law is expressed as:

S = k * P

Where:

S = Solubility of the gas in the liquid (usually in mol/L or g/L)

k = Henry's Law constant, which is specific to the gas and the solvent at a given temperature (units depend on the units of pressure and solubility chosen)

P = Partial pressure of the gas above the liquid (usually in atm or kPa)

To calculate the solubility of a gas in a liquid under different pressures, you would typically perform the following steps:

Determine the Henry's Law constant (k) for the specific gas and solvent at the given temperature.

Measure or obtain the partial pressure (P) of the gas above the liquid at the desired pressure conditions.

Use the Henry's Law equation to calculate the solubility (S) of the gas in the liquid:

S = k * P

The solubility will be in units of mol/L (molarity) or g/L, depending on the units used for the Henry's Law constant and partial pressure.

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Answer:

dicot

Explanation:

I looked it up lmoooo

Answer:

a scientific question

Procedure

Conclusion.

Explanation:

Scientific investigation is usually carried out to explain and give answers to natural phenomenon. Now, this scientific investigation is performed through the three main types as described in the question.

With that being said, the most common parts of all types of investigation are :

1. Scientific question: In this stage, questions are usually asked on the basis of observation made which could be answered.

2. Procedure: In this stage, the dimension of the steps are followed to answer and test the scientific question.

3. Conclusion: This is the primary aim that we check when done with our sample values

Answer:

the chemical composition of a substance.

Explanation:

Answer: Active transport goes against the gradient causing it to use ATP (energy) unlike diffusion which uses passive. Two types of diffusion are simple diffusion and facilitated diffusion, whereas two types of active transport are primary and secondary active transport.

Explanation: Active energy uses more energy to function rather than diffusion which has multiple types causing it to be different from active transport. Hope this helps!!

By definition, electrolysis is the use of an electric current to cause a chemical reaction which wouldn't otherwise happen. In a chemical change, bonds are either broken or formed. Electrolysis is a chemical change because, in the process of electrolysis, bonds are broken or formed.

Answer:

synthesis reaction

Explanation:

A + X --> AX

Answer:

Combustion reaction

Explanation:

Explanation:

Archaeologists use that assumption, called the law of superposition, to help determine a relative chronology for the site itself. Then, they use contextual clues and absolute dating techniques to help point to the age of the artifacts found in each layer.

Answer:

Radiotherapy

Explanation:

Answer: True

Explanation: Think of it as weathering makes a mess, erosion cleans it up and deposition takes it somewhere else. Hope this helps!!!

Answer:

Electrolysis is commercially important as a stage in the separation of elements from naturally occurring sources such as ores using an electrolytic cell

Explanation:

There is a limit to different things we encounter around the universe due to a lot of reasons.

To overcome these barriers, some catalysts that are not readily available are needed. This reduces the combination of some atoms in nature.

This and many more reasons limits the combination of chemical substances.

There is a limit to different things we encounter around the universe due to a lot of reasons:

So, for a chemical reaction to occur there are certain parameters that need to taken into consideration for a chemical reaction to actually takes place.

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Answer:Each event in the journey from Egypt to Mount Sinai, where God delivers his laws to the Israelites, propels Moses further into the roles of prophet, priest, ruler, and savior of Israel. Moses' most heroic virtue is his steadfast obedience, and it might be said that a passive quality permeates each of his miracles.

Explanation:

The statement is inconsistent with Dalton's atomic theory, which emphasizes that atoms combine in simple, whole-number ratios to form compounds.

The statement "an oxygen atom combines with 1.5 hydrogen atoms to form a water molecule" is inconsistent with Dalton's atomic theory because Dalton's atomic theory states that atoms combine in simple, whole-number ratios to form compounds.

According to Dalton's atomic theory, atoms are indivisible and retain their identity during chemical reactions. Atoms of different elements combine in fixed ratios to form compounds, and these ratios are expressed as simple whole numbers. For example, in the case of water (H2O), Dalton's theory would state that one oxygen atom combines with two hydrogen atoms in a 1:2 ratio.

The statement that an oxygen atom combines with 1.5 hydrogen atoms contradicts this fundamental principle of Dalton's atomic theory. Atoms cannot be divided into fractions or combine in non-whole-number ratios according to Dalton's theory.

Therefore, the statement is inconsistent with Dalton's atomic theory, which emphasizes that atoms combine in simple, whole-number ratios to form compounds.

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A film inside a box can be exposed by beta particles but not alpha particles due to their different penetration capabilities

Alpha particles are much larger and heavier than beta particles, which means that they cannot penetrate through materials as easily as beta particles.

When a film is kept in a box, the box acts as a shield that blocks alpha particles from reaching the film, as the particles cannot pass through the material of the box. However, beta particles are smaller and have less mass, which makes them more capable of passing through materials. Therefore, if there is a source of beta particles outside the box, they can penetrate through the material of the box and reach the film, potentially exposing it.

In summary, the ability of particles to penetrate through materials is dependent on their size and mass, with alpha particles being too large to penetrate through the box and beta particles being small enough to pass through it.

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