Which of the following correctly identifies an acid-base pair?

HCl, NaOH

H2CO3 , CO32-

H3O+ , OH-

NH3, NH4+

Answer:

I think its cadmium pliz mark brainliest if helpful

Answer:

(e) 1

Explanation:

Each atom has some energy levels and each energy level requires an electron to have certain amount of energy to reside in that energy level. Similarly, in order to excite the hydrogen atoms to a state n =6, its electrons must be provided a certain amount of energy that is constant. This energy is provided in form of photons. These photons have a constant wavelength as a result of constant energy. So, when these electrons go back to the ground state, they emit photons of same wavelength to release the energy they absorbed. Hence, only 1 wavelength is produced when atoms relax to their ground state from n = 6.

Therefore, the correct answer will be:

(e) 1  

Answer:

grams

Explanation:

With grams, you can calculate the mass of something. Centimeters would just give you the volume, which doesn't indicate how much matter makes up an object.

The molar mass of methylammonium bromide is 111u.

The molar mass is defined as the mass per unit amount of substance of a given chemical entity.

Multiply the atomic weight (from the periodic table) of each element by the number of atoms of that element present in the compound.

Add it all together and put units of grams/mole after the number.

Atomic weight of H is 1u

Atomic weight of N is  14u

Atomic weight of C is  12u

Atomic weight of Br is  79u

Calculating molar mass of  \(2H_3NCH_3Br\) =2(1 x3+ 14+12+ 1 x 3 +79) = 111u

Hence, the molar mass of methylammonium bromide is 111u.

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Answer:

Atoms are the smallest particle that make up living both living and non living things, they are made up of subatomic particles; protons, neutrons and electrons. Of these the electrons protons and neutrons are in the nucleus and the protons electrons orbit around the nucleus. Of the subatomic particles, the electrons have the largest smallest mass and are negatively charged, the neutrons (negative charge) (no charge) and protons (positively charged) both have a relative mass of 1. Atoms contain an equal number of protons and neutrons electrons, so carry no overall charge. An element is a substance made up of only two one type of atom. Elements can be found in the Periodic table of elements, they usually have two numbers next to the chemical symbol, the larger number is generally the atomic mass number, which represents the number of neutrons and the number of protons. The smaller number is the relative atomic mass atomic number which represents the number of electrons or neutrons protons. In order to calculate the number of neutrons, you minus the atomic number from the relative atomic mass.

Answer:

a cloud of adult stars that floats through space where protostars are born.

Explanation:

hope this helped:)

brainliest for the brains:)

Answer:

Unicellular organisms consist of only one cell and multicellular organisms consist of many cell.

Explanation:

Living things made up of a cell are called unicellular beings. They are very small and simple. In other words, unicellular organisms are those that are formed only by a single cell in which all the vital functions necessary for life are produced. For this reason, they are mostly microscopic organisms. Examples of unicellular organisms are viruses or bacteria.

Multicellular organisms are made up of a large number of cells. They present, therefore, a greater complexity than unicellular organisms in terms of the functions they develop. All current multicellular organisms come from a single cell, that is, they begin their life being unicellular. That is, they are formed from a zygote. Some examples of multicellular organisms are mammals, fungi, and mosses.

So, unicellular organisms consist of only one cell and multicellular organisms consist of many cell.

The condition of  GATTACA depicts a society where people are discriminated against because of their genetic makeup and their future is determined by their genes. Although fictional, the idea of ​​genetic discrimination is a real and troubling thing in today's world.  

Genetic discrimination is defined as treating individuals differently based on their genetic information. This type of discrimination can take many forms, including denial of employment, education, insurance, and housing based on  genetic makeup. It can also lead to stigma, social exclusion and loss of privacy.  In my opinion, the government's genetic discrimination as described in GATTACA is morally unacceptable.

The film depicts a society where people are not judged by their character, abilities or achievements, but rather by factors beyond their control. It is unfair to assume that people with "perfect genes" are better or more capable than those without.

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Answer:

1) faster

2) slower

Explanation:

Answer:

faster

Explanation:

Answer:

L-2.75 W-2.75 H-2.85

Explanation:

Answer:

Nitrogen sulfate

Explanation:

In Sodium sulfate there is 1 sulfur ion since the poly atomic ion SO4 has only one sulfur. In nitrogen sulfate there are 3 sulfur ions since it is (SO4)3 so there are three SO4 poly atomic ions meaning there are 3 sulfur ions.

The statement "the absorbance of a sample as measured by UV-visible spectrometry is inversely proportional to the concentration of the sample, such that, as the concentration increases, the absorbance decreases" is False.

Absorbance is a measure of how much light a substance can absorb. It is defined as the negative logarithm of the transmittance of a solution.

Absorbance = -log10 (Transmittance)

Beer-Lambert law is based on the relationship between the absorbance of a sample and its concentration.

According to Beer-Lambert's law, the amount of light absorbed by a substance is directly proportional to its concentration and path length. The relationship can be mathematically represented as follows :

Absorbance = εcl

where,

ε is the molar absorptivity or extinction coefficient

c is the concentration of the solution

l is the path length of light through the solution.

The absorbance of a sample as measured by UV-visible spectrometry is directly proportional to the concentration of the sample, not inversely proportional.

As the concentration increases, the absorbance also increases. This relationship is used to determine the concentration of a solution by measuring its absorbance using spectrometry.

Thus, the given statement is false.

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EXPLANATION:

Firstly, we need to define a base and alkali

A base is a substance that can neutralize the acid by reacting with hydrogen or hydroxonium ions

An alkali is a soluble base. This implies that alkali is a base that dissolves in water

Hence, all Akali are bases and all bases are not alkali

When the base neutralizes acid by reacting with a hydrogen ion, the resulting ions will be negatively charged which is the Hydroxyl ion

Option (e) is correct that is all are lipids

Since water is a polar molecule, these organic compounds are nonpolar molecules that can only dissolve in nonpolar solvents. These molecules, which are present in meals like oil, butter, whole milk, cheese, fried dishes, and some red meats, can be produced by the liver in the human body.

Simple Lipids

Various alcohols and fatty acid esters.

Complex Lipids

fatty acid esters that also contain other groups besides alcohol.

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Answer:

it is a strong acid

Explanation:

on the pH scale acids range from 1 to 6

strong acids range from 1 to 3 while weak acids range from 4 to 6

size and shape. only the appearance of the paper will have changed, but is reversible.

Answer:

D.

Double replacement, CaO + Cl2O

Explanation:

The chemical equation is CaO + Cl₂\(\rightarrow\) CaCl₂ + O₂ and is a displacement reaction.

Chemical equation is a symbolic representation of a chemical reaction which is written in the form of symbols and chemical formulas.The reactants are present on the left hand side while the products are present on the right hand side.

A plus sign is present between reactants and products if they are more than one in any case and an arrow is present pointing towards the product side which indicates the direction of the reaction .There are coefficients present next to the chemical symbols and formulas .There are different types of chemical reactions where displacement reaction is one of it's types.

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Answer:

The differences between them are as follows :-

1.kinetic energy is the energy possessed by an object by virtue of it being on its motion.

1.electrostatic force is the energy possessed by an object by virtue of it being on its position.

2.kinetic energy symbol is KE.

2.electrostatic force symbol is PE.

The percent composition by mass of aluminum in al2(so4)3 (gram formula mass = 342 grams) is 15.8%.

Aluminum sulphate is an ionic compound, a combination of both positive and negative ions. Ions are charged atom, which may either be monatomic ions (single atoms) or polyatomic (multiple atoms combined to form a charged part). Aluminum forms a + 3 ion, Al+3, and sulphate is the -2 polyatomic ion, (SO4)-2

So there are two aluminum atoms, three sulfur atoms, and 12 oxygen atoms in a single unit of the compound Al2(SO4)3. This sums to 17. Therefore, there are 17 atoms in a single unit of the compound Al2(SO4)3. The formula for aluminum sulfate is Al2(SO4)3. Then, in a formula unit of Al2(SO4)3 there are two aluminum ions and three sulfate ions; or two aluminum, three sulfur, and twelve oxygen atoms.

Total amu of this compound = 342

Therefore, percent composition of Aluminum = 54/342 x100 = 15.8%

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pH at the start of the titration  of barbituric acid is 4.58.

To calculate the pH at different points in a titration of barbituric acid, you need to know the dissociation constant (Ka) of the acid and the volume and concentration of the acid and base being used.

Barbituric acid has a Ka value of 2.6 x 10^-5.

Let's assume you are titrating the barbituric acid with 0.100 M sodium hydroxide (NaOH). The balanced chemical equation for this reaction is:

H2C4H2N2O3 + NaOH → NaC4H2N2O3 + H2O

At the start of the titration, the pH of the solution is determined by the concentration of the barbituric acid. Since it is a weak acid, you can use the Ka value to calculate the pH using the equation:

pH = pKa + log([A-]/[HA])

Where pKa is the negative logarithm of the dissociation constant, [A-] is the concentration of the conjugate base (in this case, NaC4H2N2O3), and [HA] is the concentration of the acid (in this case, H2C4H2N2O3).

Plugging in the values, you get:

pH = 4.58 + log([NaC4H2N2O3]/[H2C4H2N2O3])

pH = 4.58 + log(0/[H2C4H2N2O3])

pH = 4.58

So the pH at the start of the titration is 4.58.

As you add the NaOH solution to the barbituric acid, the pH will increase. At the halfway point of the titration, known as the equivalence point, the number of moles of NaOH added is equal to the number of moles of barbituric acid present. At this point, the pH will be determined by the concentration of the salt (NaC4H2N2O3) that has formed.

After the equivalence point, the pH will be determined by the excess concentration of NaOH that has been added. The pH will be calculated using the same equation as before, but with [A-] being the concentration of NaOH and [HA] being the concentration of the remaining barbituric acid

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Answer:

1) Dissolution of the copper anode

2) Time of the reaction

Explanation:

The figure shows the electrolysis of Copper Chloride using copper electrodes.

In aqueous solution, the ions present in the solution include:  H⁺, OH⁻. Cu²⁺ Cl⁻

The half equations for the reaction  are:

At rhe Anode (positive electrode) : 2Cl⁻(aq) - 2e = Cl₂(g)

At the Cathode (negative electrode) Cu²⁺ (aq) + 2e = Cu (s)

Hence copper ions are reduced at the cathode by gaining two electrons to form copper solid deposits. It is the mass of the deposited copper that the student measured over time.

Reasons why the actual mass is different  from the expected mass

1) Dissolution of the copper Anode: The electrodes used for this experiment are copper electrodes as both the positive and negative electrode.

Under the influence of an electric current, the copper anode will dissolve by gaining electrons and go into solution as copper II ions (Cu²⁺). thereby increasing the amount of copper ions in solution.

The aqueous copper ions from the anode and from the copper chloride (CuCl₂ (aq) electrolyte will migrate to the negative cathode, gain electrons, and get deposited as pure copper solid.  This increases the mass of copper solid deposited at the cathode.

2) Time: As the time of the reaction from zero to sixty (60) minutes under the influence of an electric current, more of the copper anode will dissolve, migrate to the cathode and get deposited as copper solid.

Hence as the time of the reaction increases, more of the copper ions will be deposited as copper solid thereby increasing the value of the actual mass of copper deposited.

Dissolving of copper and time are the two reasons for the different value to the expected value.

Dissolution of copper and less time are the two reasons for the different form the expected value because during the accumulation of copper on the anode some amount dissolved in the solution and not accumulated at the anode while on the other hand, time is also a factors which gives us different value as compared to expected value.

60 minutes are less time for the deposition of copper at the anode so if the time is extended then the value is same or near to the expected value so we can conclude that dissolving of copper and time are the two reasons for the different value to the expected value.

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Adding an ionic species to pure water can result in a change in pH if the species reacts with water to produce either acidic or basic products. Specifically, ionic species that can donate or accept protons (H⁺) can alter the concentration of H⁺ ions in the water and consequently affect its pH.

For example, if an ionic species donates protons to water, it increases the concentration of H⁺ ions, making the solution more acidic and lowering the pH. Conversely, if an ionic species accepts protons from water, it reduces the concentration of H⁺ ions, resulting in a more basic solution and raising the pH.

The extent of pH change depends on the concentration and strength of the ionic species. Strong acids and bases, such as hydrochloric acid (HCl) and sodium hydroxide (NaOH), can cause significant changes in pH when added to pure water due to their high reactivity and ionization. Weaker acids and bases may have a smaller impact on pH, depending on their concentration and dissociation constant.

In summary, the addition of an ionic species to pure water can affect the pH if the species can donate or accept protons, altering the concentration of H⁺ ions in the solution. The strength and concentration of the species determine the magnitude of the pH change.

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Nitric acid is a highly corrosive and toxic substance that poses several safety hazards. Some of the main safety hazards associated with nitric acid are Corrosive, Toxic, Fire hazard, Potentially explosive mixtures.

Nitric acid is highly corrosive and can cause severe burns upon contact with skin or eyes. It can also corrode metals, plastics, and other materials.

Nitric acid is a strong oxidizer that can react violently with other chemicals, including organic compounds, and can release toxic fumes when heated or exposed to other substances.

Nitric acid is a strong oxidizing agent and can react with combustible materials, such as paper, wood, and cloth, potentially causing fire or explosion.

Nitric acid can form potentially explosive mixtures when mixed with certain other chemicals, such as ethanol.

To minimize the risks associated with using nitric acid, it is important to handle it with care and wear appropriate personal protective equipment (PPE), such as gloves, goggles, and a lab coat. It is also important to store nitric acid in a well-ventilated area, away from heat sources and combustible materials. Additionally, when using nitric acid in situ, it is important to ensure that the reagents used to form it are handled and stored properly.

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Answer:

halides

Explanation:

This is one electron away from having a full octet of eight electrons, so these elements tend to form anions having -1 charges, known as halides: fluoride, F-; chloride, Cl-, bromide, Br-, and iodide, I-. In combination with other nonmetals, the halogens form compounds through covalent bonding.

The density of borosilicate glass is different from the weighted average of the densities of its components because the density of a glass is influenced by its molecular structure and the way its atoms are arranged, rather than a simple weighted average of its components.

Borosilicate glass is a type of glass that contains boron trioxide, which makes it more resistant to thermal expansion and chemical corrosion. When the glass is formed, the components (such as silicon dioxide, boron trioxide, and other metal oxides) are combined at high temperatures, causing them to form a new amorphous material with a unique atomic structure.
The arrangement of atoms and bonding in borosilicate glass is not linear or consistent, and it can differ from the atomic arrangements found in the individual components. This irregular structure results in the overall density of the glass being different from a simple weighted average of the densities of its individual components.
In summary, the density of borosilicate glass is different from the weighted average of the densities of its components due to the unique molecular structure and atomic arrangements that occur when the glass is formed.

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Explanation:

the answer is D they both increase

When ethylene glycol (an antifreeze) is added to water, the boiling point of the water increases, and the freezing point decreases.

Antifreezers are the substance which on mixes with any other compound will decreases the freezing point of that compound.

When we add ethylene glycol which is an antifreeze substance in the water then depression in freezing point takes place but at the same time elevation in boiling point also happen, because they had a great attraction force within themselves.

Hence increasing in boiling point and decreasing in freezing point takes place.

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The correct choice for a bidentate ligand is d) -OCH₂CH₂CH₂O-. The correct response for the coordination number (C.N.) and oxidation number (O.N.) of the transition metal atom in [Co(NH₃)₂(H₂O)₂Cl₂]^+ is C.N. = 6; O.N. = +3.

A bidentate ligand is capable of forming two bonds or coordination sites with a central metal atom. Among the given choices, d) -OCH₂CH₂CH₂O- is the only one that can function as a bidentate ligand due to its ability to bind to a metal atom through two oxygen atoms.

Regarding the complex [Co(NH₃)₂(H₂O)₂Cl₂]+, the coordination number (C.N.) refers to the number of bonds formed between the central metal atom (cobalt, Co) and its ligands. In this case, there are six ligands attached to the cobalt atom, which results in a coordination number of 6.

The oxidation number (O.N.) of the transition metal atom represents the charge assigned to the metal ion in the complex. In [Co(NH₃)₂(H₂O)₂Cl₂]+, the cobalt atom has an oxidation number of +3. This is determined by considering the charges of the ligands (ammonia, water, and chloride) and the overall charge of the complex.

Therefore, the correct response is C.N. = 6; O.N. = +3 for the coordination number and oxidation number of the cobalt atom in [Co(NH₃)₂(H₂O)₂Cl₂]+.

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Answer:

balanced equation of glucose

6CO2 + 6H2O----------C6H12O6 + 6O2

in the presence of sun light.

Answer:

5 000 000 (5 million atoms)

Explanation:

Let us assume that a vanadium atom has a spherical shape.

diameter of a sphere = 2 x radius of the sphere

Thus,

Radius of a vanadium atom = 130 pm

                                              = 130 x \(10^{-12}\) m

The diameter of a vanadium atom = 2 x radius

                                                         = 2 x 130 x \(10^{-12}\)

                                               = 260 x \(10^{-12}\) m

Given a distance of 1.30 mm = 1.30 x \(10^{-3}\) m,

The number of vanadium atoms required to span the distance = \(\frac{1.3*10^{-3} }{260*10^{-12} }\)

                                                  = 5000000

Therefore, the number of vanadium atom that would span a distance of 1.30 mm is 5 million.