Express your answer to three significant figures.

The net charge is negative [(+16) + (18) = 2] when there are more electrons than protons, as is the case with the sulfur ion. Anions are negative ions.

The electron, the smallest constituent part of an atom, has a negative electrical charge .Protons and electrons each occurs in similar numbers in neutral atoms. One atom and one proton are all that the hydrogen atom has. On the other hand, the uranium atom possesses 92 protons, which means 92 electrons.

The electrons are an atom's negatively charged building blocks. The total negative charge of an atom's electrons counteracts the charge of its protons in the elementary particle.

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Answer:

Producers are the base of the food web

Explanation:

Many producers use the sun (plants do; photosynthesis), air, soil, water; they create their own energy

Due to its symmetry and the fact that the pull of the two oxygen atoms on the electrons of carbon cancel each other out, carbon dioxide is a nonpolar molecule with polar bonds. Because the vector sum of the dipole moments of the two CO bonds is zero, the CO2 molecule is non-polar even if the CO bond in it is polar.

With carbon, each oxygen atom forms a double bond. Different electronegativities of carbon (C) and oxygen (O) result in unequal distribution of electrons between them. Due to the cancellation of the two bond dipole moments, there is no net molecule dipole moment. Carbon dioxide is a non-polar gas as a result.

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Answer:

0.9 and 0.90 are not the same because 0.9 is not up to zero but 0.90 is up to zero

Answer:

[tex]\huge\boxed{\sf n = 0.5 \ mol}[/tex]

Explanation:

Volume = v = 11.2 dm³

Molar Volume = V = 22.4 dm³/mol

Moles = n = ?

[tex]\displaystyle n = \frac{v}{V}[/tex]

[tex]\displaystyle n = \frac{11.2}{22.4} \\\\n = 0.5 \ mol\\\\\rule[225]{225}{2}[/tex]

The element that has the greatest tendency to undergo oxidation is Francium.

When an element is reduced, it becomes an oxidizing agent because it receives electrons, whereas when an element is oxidized, it loses electrons. Electrons are easily lost (or donated) by strong reducing agents. Better reductants typically have atomic radii that are relatively large. In such species, the valence electrons are not strongly attracted to the nucleus because of the great distance between them.

The greatest chemical reducer should be francium, which has one outside electron in the 7s orbital. Alkali metal francium quickly donates an electron. As a result, it might be regarded as a reducing agent.

Thus, Francium has the greatest tendency to undergo oxidation.

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The formula of the hydrated potassium carbonate salt is K₂CO₃.2H₂O

Based on the calculated mass ratio of carbon and oxygen in carbon dioxide, carbon has a fixed composition.

Hydrated compounds are compounds that contain one or more molecules of water physically combined with a molecule of the compound.

The formula of the hydrated potassium carbonate salt is determined as follows:

Mass of the hydrated sample = 10.0 g

Mass of anhydrous salt = 7.83

mass of water = 10 - 7.83

mass of water = 2.17 g

Molar mass of water = 18.0 g

Molar mass of anhydrous potassium carbonate = 138 g

moles of anhydrous potassium carbonate in sample = 7.83/138

moles of anhydrous potassium carbonate = 0.056 moles

moles of water in the hydrated salt = 2.17/18

moles of water in the hydrated salt = 0.12

Mole ratio of water to anhydrous salt = 0.12/0.056

Mole ratio of water to anhydrous salt = 1 : 2

Formula of hydrated salt = K₂CO₃.2H₂O

The mass ratio of carbon to oxygen in the compounds is given below:

Sample 1:

Mass ratio = 3.62 / (13.26 - 3.62)

Mass ratio = 0.38 : 1

Sample 2:

Mass ratio = 5.91 / (21.66 - 5.91)

Mass ratio = 0.38 : 1

Sample 3:

Mass ratio = 7.07 / (25.91 - 7.07)

Mass ratio = 0.38 : 1

Carbon has a fixed composition.

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The molar concentration of the initial calcium chloride solution is 0.252M.

Molar concentration or molarity refers to the concentration of a substance in solution, expressed as the number moles of solute per litre of solution.

According to this question, the EDTA binds calcium ions in a titration procedure in a 1:1 ratio. If the titration was begun with 247mL of calcium chloride, the molar concentration used initially can be calculated as follows:

CaVa = CbVb

Where;

Ca × 247 = 1.69 × 36.8

247Ca = 62.192

Ca = 62.192 ÷ 247

Ca = 0.252M

Therefore, 0.252M is the molar concentration of the calcium chloride solution.

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Answer:sulphur reacts with chlorine in 1:2

Explanation:hope this helps :)

Amino acids and carboxylic acids both contain functional groups in organic compounds known as amino acids. Amino acid also known as  carboxylic acids

The importance of alpha-amino acids, which build up proteins, cannot be overstated. Only 22 alpha amino acids make up the genetic code. An example of an amino acid is alpha-amino [alpha-amino] carboxylic acid. Every molecule contains a core carbon atom (C), also known as the -carbon, which is connected by both an amino and a carboxyl group. Frequently, the final two bonds of the -carbon atom are filled by a hydrogen (H) atom and the R group. The common formula for a carboxylic acid is R-COOH, where R stands for the molecule's remaining portion and COOH for the carboxyl group.

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The process that brings rocks and minerals containing phosphorus to the surface so it can be released for use by living things is called uplift.

A rock is defined as a solid or hard material that is made up of different minerals and they are of three main types such as igneous rock, sedimentary rock and metamorphic rocks.

The minerals that are found in rocks include the following:

quartz,

feldspar,

mica,

amphibole,

phosphorus

olivine, and calcite.

When these minerals are being transported to the surface of the earth to be used by plants and animals it is called uplift.

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An amino group is a functional group consisting of an amino (-NH2) and a carboxyl (-COOH) group, which is found in proteins.

It is essential for the formation of peptide bonds between amino acids, which are the building blocks of proteins. The amino group is partially positively charged and is therefore able to interact with other molecules through hydrogen bonding and electrostatic interactions.

The amino group is also able to donate a hydrogen atom, making it an important component in many biochemical reactions.

Furthermore, it plays an important role in the folding of proteins, as the electrostatic interactions between the amino and carboxyl groups help stabilize the protein's three-dimensional structure. In addition, the presence of the amino group can influence the solubility of proteins in different solutions.

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Final Molarity of barium ion = 0.127 M.

We first assume the reaction goes to completion and that the volume. of the reaction doesn't change.

The balanced stoichiometric equation is

Ba(NO3)2(aq) + (NH4)2SO4(aq) = BaSO4(s) + 2NH4NO3(aq)

irst of, we need to check which reactant is in excess and which one is completely used up in the reaction. To do this, we fimd the number moles of each reactant at the start of the reaction.

For Ba(so4)₂

Number of moles = (Mass)/(Molar Mass)

Mass of Barium nitrate = 9.91 g

Molar mass of Barium nitrate = g/mol

Number of moles = (9.91/261.337) = 0.038 moles.

For NH₄NO3,

Number of moles = (Concentration in mol/L) × (Volume in L)

Concentration of Ammonium surface in mol/L = 0.50 M

Volume in L = (300/1000) = 0.3 L

Number of moles = 0.50 × 0.3 = 0.15 moles

From the stoichiometric balance of the reaction,

1 mole of Ba(NO3)₂ reacts with 1 mole of BaSO₄

Hence, it is evident that it is Ba(NO3)₂ that is the limiting reagent; the chemical specie that is used up in the process of the reaction and it determines the amount of other reactants required & products formed.

1 mole of Ba(NO3)₂ gives 1 moles of 0.038 moles of BaSO4(s) will give 1× 0.038 moles is The molarity of Ba(SO4) Then given as (number of moles) ÷ (Vol in L)

Number of moles = 0.038moles

Volume of the solution in L = 0.3 L

Molarity of BaSO4  = (0.038/0.3)

= 0.127 M

Note that 1 mole of Ba(SO4)contains 1 mole of Ba+2 ion

Hence, 0.127 M of Ba(SO4) also contains 0.127 M of Ba+2 ion.

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Reduction is a type of chemical reaction in which a particular molecule or compound loses one or more electrons.

It is the opposite of oxidation, which involves the addition of electrons. During a reduction reaction, the number of electrons held by a molecule increases, resulting in a decrease in the oxidation state of the molecule.

This type of reaction usually involves the transfer of electrons from one molecule to another. Examples include the reduction of a metal oxide to form a metal, the reduction of nitrate to form a nitrite, and the reduction of an aldehyde to form an alcohol.

Reduction reactions play an important role in chemical synthesis, energy production, and the metabolism of living organisms.

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The process of the oxidation of half-reaction of a redox reaction occurs at the cathode in a galvanic cell.

A redox reaction's half reaction is the portion of the process that either includes oxidation or reduction. A half reaction is produced by accounting for the changes in oxidation state that have occurred in each component participating in the redox reaction. Half reactions are widely used in redox reactions to balance them. In acidic oxidation-reduction reactions, the hydrogen ions in the half reaction must be balanced with H+ ions once the atoms and oxidation numbers have been set in check.

Galvanic cells are named after the scientists Luigi Galvani and Alessandro Volta, respectively. A galvanic cell is an electrochemical device that generates an electric current by spontaneous oxidation-reduction events. Galvanic cells, which come in two varieties, are electrochemical devices that harness the chemical energy of redox processes that occur spontaneously to generate electricity.

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Any substance that is a gift at the beginning of a chemical reaction a reactant

“A substance is a matter which has a specific composition and unique homes. ” every pure detail or pure compound is a substance. A substance can't be separated by way of any physical technique. The homes/composition of a natural substance is fixed.A substance is be counted which has a particular composition and unique houses. every pure element is a substance. each pure compound is a substance. Examples of materials: Iron is an element and as a result is also a substance.

A chemical substance is a shape of matter having a steady chemical composition and function homes. some references add that chemical substances can't be separated into their constituent factors with the aid of bodily separation techniques, i.e., without breaking chemical bonds.

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The 32 in Celsius is equivalent to 89.6 degrees Fahrenheit temperature. The temperature measurement unit on the Celsius system is the degree Celsius (originally known as the centigrade scale outside Sweden).

Celsius is measured in the Kelvin scale, one of two temperature scales used in the International System of Units (SI). The Fahrenheit temperature scale is a temperature scale that is based on one that physicist Daniel Gabriel Fahrenheit temperature proposed in 1724. (1686–1736). The unit is the degree Fahrenheit (symbol: °F). The concept of temperature is used to convey quantitatively how hot and cold something is. Using a thermometer, one can gauge temperature. Thermometers are calibrated using different temperature scales that traditionally relied on different reference points and thermometric materials for definition.

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Naturalization is the process by which a non-citizen of a country can acquire citizenship. It usually involves a process of paperwork, interviews, and tests to demonstrate knowledge of the country’s language, culture, and history. it involves 7steps.

1. File Form N-400: This is the first step in the naturalization process. The Form N-400 is an application for naturalization and must be filed with U.S. Citizenship and Immigration Services (USCIS). The form must be filled out completely and accurately, and it is important to include all necessary documents, such as a copy of your green card, birth certificate and other documents that prove your eligibility for naturalization.

2. Fingerprint Appointment: Once the Form N-400 is submitted, the USCIS will contact the applicant to schedule a fingerprint appointment. The fingerprints are used to conduct a background check to verify the applicant’s identity and to determine if they have any criminal history.

3. Interview Appointment: After the fingerprint appointment, the USCIS will contact the applicant to schedule an interview at a local USCIS office. During the interview, the applicant will be asked questions about their application and basic civics questions. The applicant must correctly answer at least six out of ten questions to pass the interview.

4. English and Civics Tests: In addition to the interview, the applicant must also take an English and civics test. The English test assesses the applicant’s ability to read, write, and speak English. The civics test assesses the applicant’s knowledge of U.S. history and government.

5. Oath of Allegiance: If the applicant passes the interview and tests, they will be scheduled for a naturalization ceremony. At this ceremony, the applicant will take the Oath of Allegiance to the United States. Once the oath is taken, the applicant is officially a U.S. citizen.

6. Certificate of Naturalization: After the ceremony, the applicant will receive their Certificate of Naturalization. This document serves as proof of the applicant’s U.S. citizenship.

7. Passport Application: Finally, the applicant must submit a passport application to the U.S. Department of State to receive their U.S. passport. This passport will serve as proof of their citizenship and allow them to travel abroad.

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The statement which correctly explains how matter is conserved in chemical reactions is- Atoms of each element are conserved, so the total mass does not change.

The Law of Lomonsov-Lavoisier and the Law of Conservation of Mass are other names for the Law of Conservation of Matter. "The mass is not generated or destroyed, simply altered," according to this law.

As a result of the diverse atomic arrangements in the various substances, the reagents interact with one another to create new products that differ from the reagents in terms of their physical and chemical characteristics. But the amount of matter or mass before and after a transformation (chemical reaction) must always be constant; that is, the amounts of the masses involved in a given reaction must not change in their proportions when the reaction is complete.

n other words, the mass prior to the chemical reaction and the mass following the reaction are equal. Nuclear reactions are the exception to the norm, where it is possible to change mass into energy and vice versa.

Hence, the statement which correctly explains how matter is conserved in chemical reactions is- Atoms of each element are conserved, so the total mass does not change.

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Your question is incomplete please write the complete question over the internet.

The balanced chemical equation for acid-base reactions is as given below

2HCl(aq) + Ca(OH)2 ------ CaCl2 + 2H2O

A chemical equation is said to be balanced chemical equation if the atoms or molecules of different elements on the reactant side is equal to the atoms or molecules of different elements on the product side.

In the given reaction, HCl is reactant and Ca(OH)2 is base. They react with each other to form CaCl2 and release two molecules of H2O.

Now, we will balance the chemical equation.

On reactant side, there are 3 atoms of hydrogen atoms, one atom of chlorine, two atom of oxygen and one calcium atom. So, we equal it by reacting two molecules of HCl with one molecule of Ca(OH)2 to form one molecule of CaCl2 and two molecules of water.

Therefore, by balancing equation we get

2HCl(aq)+Ca(OH)2 ------ CaCl2 + 2H2O

Thus, we concluded that the balanced chemical equation for acid-base reactions is as given below:

2HCl(aq) + Ca(OH)2 ------ CaCl2 + 2H2O

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Because the electrons in sulfur are so tightly bound and unable to move, the element functions more like an insulator. Since electrons have a harder time moving when they are packed closely together as a solid, Sulphur is dull and brittle, which again indicates that it is a poor conductor.

Sulfur is a brittle, pale yellow, odorless solid that is soluble in carbon disulfide but insoluble in water.

Materials like coal and sulfur, however, have a softer, duller appearance. On hammer blows, they crumble into a powdery mass. They lack sonority and have poor conductivity for both heat and electricity.

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The process of the reduction of half-reaction of a redox reaction occurs at the cathode in a galvanic cell.

A redox reaction's half reaction is its component that involves either oxidation or reduction. By taking into account how each substance involved in the redox reaction has changed in oxidation state, a half reaction is obtained. To balance redox reactions, half reactions are frequently employed. The hydrogen ions in the half reaction must be balanced with H+ ions in acidic oxidation-reduction reactions after the atoms and oxidation numbers have been balanced.

An electrochemical cell in which an electric current is produced from spontaneous oxidation-reduction reactions is called a galvanic cell, while a voltaic cell is named after the scientists Luigi Galvani and Alessandro Volta, respectively. Galvanic cells are two types of electrochemical devices that use chemical energy from spontaneous redox reactions to produce electricity.

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Answer:

how does the DNA seperate ?First, a so-called initiator protein unwinds a short stretch of the DNA double helix. Then, a protein known as helicase attaches to and breaks apart the hydrogen bonds between the bases on the DNA strands, thereby pulling apart the two strand

discuss

DNA is negatively charged, therefore, when an electric current is applied to the gel, DNA will migrate towards the positively charged electrode.

Explanation:

The chain of custody for the finger print on the Door Know is summarized in the Chain of Custody form attached.

This is a procedure that documents each individual who handled the evidence, the date/time it was gathered or transferred, and the purpose for the transfer as it moves through its collecting, safekeeping, and analysis lifespan.

The most important aspect of evidence recording is the chain of custody. It is essential to demonstrate to the court of law that the evidence is genuine, i.e., that it was obtained at the crime scene. It was always in the care of someone assigned to manage it, and it was never unaccounted for.

The chain of custody demands that every transfer of evidence from person to person be documented from the time the evidence is acquired and that it be proven that no one else could have accessed that evidence. It is recommended to restrict the number of transfers to a minimum.

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Full Question:

In the video at the beginning of this unit, you were introduced to Jordan, a college student and newspaper intern. Jordan was shadowing police who were collecting evidence at the scene of a crime.

Jordan is shadowing the police again at a different crime scene. This time you have gone with him. Your job will be to record all of the required information on a chain of custody document.

Choose one of the items of physical evidence mentioned in Jordan's notes below.

Complete the chain of custody document for that item. (Make it similar to the example provided beneath Jordan's notes.)

Jordan's Notes

Tuesday, February 5

I observed evidence technician Josh Sanders dust the inside doorknob on the front door for latent fingerprints. Dusting the doorknob did reveal latent prints, which Sanders lifted with tape and transferred to a small card. That occurred at approximately 3:15 p.m.

I later observed Detective Laura Wilson collect a bullet casing from the tile floor in the kitchen after another investigator first photographed the area. The bullet casing was found on the floor beneath the kitchen table and was picked up by Wilson (with gloved hands) and placed in an evidence bag. Collection of the bullet casing occurred at 3:42 p.m.

I then looked in the guest bathroom down the hall from the kitchen and observed another evidence technician, William Soto, collecting unknown red fibers from inside the bathroom sink. The time was approximately 3:53 p.m. Soto collected the red fibers with tweezers and placed them inside an evidence bag.

Example of a Chain of Custody Form

Chain of CustodyItem collected as evidence: Individual who collected the item: Date and time of collection: Description of location where item was collected: Method of collection:

Modernism is characterised by a drastic break from the conventional forms of prose and verse, in contrast to postmodernism, which makes explicit use of past styles and traditions.

The literary trend known as modernism first appeared at the beginning of the 20th century. This literary style was significantly influenced by the World Wars, industrialization, and urbanisation. These kinds of things made some people question the principles of western civilization and the future of humanity. Therefore, modernist writers began to write on the breakdown of civilization, the inner self, and awareness. Their literature also exudes a sense of confusion and breakdown.

The stream of consciousness technique, a manner of storytelling that displays the variety of thoughts and feelings that run through the mind, was often used by modernist writers. Also used by writers to emphasise society's weaknesses are irony, satire, and contrast.

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Formulas for temperature conversion involve converting temperature values between different units. Numerous techniques exist for converting temperatures. These include Kelvin, Celsius.

Such techniques are the ones that are most frequently used. The concept of temperature is used to convey quantitatively how hot and cold something is. Using a thermometer, one can gauge temperature. Thermometers are calibrated using different temperature scales that traditionally relied on different reference points and thermometric materials for definition. The Celsius scale, one of two temperature scales used in the International System of Units (SI), along with the Kelvin scale, uses degrees Celsius as its unit of measurement. The Celsius scale was first known as the centigrade scale outside of Sweden.

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Higher reactivity is caused by the ease with which electrons can be given or taken away as you move further to the left and down the periodic chart.

How quickly a substance performs a chemical reaction is measured by its reactivity. A release of energy is typically present during the reaction, which might involve the chemical alone or in combination with other atoms or molecules. Chemistry's notion of reactivity is not entirely clear. In other words, whether a substance reacts at all and how quickly it reacts, it seems to incorporate both thermodynamic and kinetic aspects. Both factors which are distinct in reality are frequently temperature-dependent.

A subatomic particle called an electron has an electric charge that is one element's negative opposite. A negatively charged, subatomic particle known as an electron can be either attached to or liberated from an atom. There are three main types of particles in an atom: protons, neutrons, and an electron that is bonded to an atom.

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