For each of the following reactions, indicate the Bronsted-Lowry acids and bases. What are the conjugate acid/base pairs?
a) CN-(aq) H2O HCN(aq) + OH-(aq) b) HC2H 02(a) + HS(aq) C2H3O2(aq) + H2S(aq)

Answer:

Discharge

Explanation:

this is the answer

Answer:

See explanation

Explanation:

Biology- digestion of food materials

Chemistry- dissolving salt in water

Astronomy - observing day and night

Physics - watching a television

Geography - observing weather changes during the day

The characteristics and the type of molecular bond they describe:

1. Bonds found in Halite (between Na⁺ and Cl⁻): Ionic bond

2. Bonds found between Si and O in the Si-O tetrahedron: Covalent bond

3. Bonds inside the water molecule (between the H and O): Covalent bond

4. Bonds that exist between two water molecules: Hydrogen bond

5. Strongest bond type: Covalent bond

6. Weakest bond type: Van der Waals bond

7. Bonds that are used by water to dissolve salt: Ionic bond

The ionic bond is a type of molecular bond found in halite (between Na⁺ and Cl⁻). The Si-O tetrahedron is held together by a covalent bond. The bond inside the water molecule (between the H and O) is also a covalent bond. The hydrogen bond is the type of bond that exists between two water molecules. The covalent bond is the strongest bond type, while the van der Waals bond is the weakest bond type. Water uses the ionic bond to dissolve the salt.

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When two reactant molecules possessing the necessary threshold energy collide with each other, they form an unstable activated complex or transition state. The given plot shows the energy diagram of an exothermic reaction.

In an exothermic reaction, the energy of the reactants is less than that of the products. The energy hump corresponds to the energy barrier existing between the reactants and products. The energy acquired by the reactant molecules to reach the level of threshold energy is called the activation energy.

1. 1st column on the lower left side = Reactants

2. Above that 2nd column = Eₐ = Activation energy of forward reaction

3. Above that 3rd column = Transition state

4. On the right upper part, 4th column = Enthalpy change ΔH

5. On the right lower part, 5th column = Products

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Answer:

All the chemical reaction take place in cytoplasm.Cell expansion,growth and replication occurs in cytoplasm.

True. active transport is used to move solutes against the concentration gradient.

Active transport is a cellular process that uses energy to move solutes against their concentration gradient, from an area of lower concentration to an area of higher concentration. This process requires the input of energy in the form of ATP (adenosine triphosphate) to drive the movement of molecules against their concentration gradient.

By utilizing specialized transport proteins embedded in the cell membrane, active transport allows the movement of ions, molecules, or other substances across the membrane against the natural flow dictated by diffusion. This mechanism enables the cell to maintain concentration gradients and perform essential functions such as nutrient uptake, ion transport, and waste removal.

In contrast, passive transport processes, such as simple diffusion or facilitated diffusion, move solutes along their concentration gradient, from higher to lower concentrations, without requiring energy expenditure. Active transport is a vital mechanism for maintaining homeostasis and ensuring the proper functioning of cells and organisms.

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Answer: 51 g

Explanation:

The fact that there are more possible combinations for amino acids than the number of amino acids themselves implies that each amino acid can be encoded by multiple codons.

A codon is a sequence of three nucleotides in DNA or RNA that corresponds to a specific amino acid.

There are 20 standard amino acids used to build proteins in living organisms. However, there are 64 possible three-letter combinations of nucleotides (4³) that can be used to form codons. This means that on average, there are more than three codons that can encode each amino acid.

To calculate the number of codons per amino acid on average, we divide the total number of codons (64) by the number of amino acids (20). Therefore, the average number of codons per amino acid is 64/20 = 3.2.

This indicates that there is a degeneracy or redundancy in the genetic code, where multiple codons can specify the same amino acid.

For example, the amino acid leucine is encoded by six different codons (UUA, UUG, CUU, CUC, CUA, CUG), while methionine and tryptophan are each encoded by a single codon.

In conclusion, the existence of more possible combinations for amino acids than amino acids themselves means that the genetic code is degenerate, allowing for redundancy and flexibility in protein synthesis.

This redundancy helps to protect against errors in DNA replication and transcription and allows for evolution to occur through the accumulation of genetic variations.

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Taking into account the definition of atomic mass, isotopes and atomic mass of an element, the average atomic mass is 35.5458 amu.

But first you have to know that the isotopes of an element are those in which its atomic numbers (that is, the number of protons) are equal, but the number of neutrons is different.

Remember that protons and neutrons are found in the nucleus of the element.

The same chemical element may consist of different atoms, that is, different isotopes.

Then the atomic mass of an element is the weighted average mass of its natural isotopes. Therefore, the atomic mass of an element is not an integer.

In other words, the atomic masses of the chemical elements are usually calculated as the weighted average of the masses of the different isotopes of each element taking into account the relative abundance of each of them.

In this case, you know naturally occurring chlorine that is put in pools is 75.53 percent 35Cl (mass = 34.969  amu) and 24.47 percent 37CI (mass = 36.966 amu). Then, the atomic mass is calculated as:

0.7553×34.969 amu + 0.2447×36.966 amu= 35.458 amu

Finally, the average atomic mass is 35.5458 amu.

Learn more:

The mass of a proton is relatively large compared to other subatomic particles. A proton has a mass of approximately 1.67 x 10^-27 kilograms or 1.007276 atomic mass units (u).

It is one of the three fundamental particles that make up an atom, along with neutrons and electrons.

Protons are positively charged particles found in the nucleus of an atom.

In comparison, the mass of a neutron is also approximately 1.67 x 10^-27 kilograms or 1.008665 u, making it slightly more massive than a proton.

On the other hand, the mass of an electron is significantly smaller.

An electron has a mass of approximately 9.11 x 10^-31 kilograms or 0.0005486 u.

Electrons are negatively charged particles that orbit the nucleus of an atom.

Comparing the masses of these subatomic particles, we can see that the proton and neutron have a similar mass, which is roughly 1836 times larger than the mass of an electron.

The electron is significantly lighter compared to protons and neutrons, contributing only a small fraction to the overall mass of an atom.

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Answer:

Why does D-block start on the fourth row of the periodic table?

Explanation:

The require more energy to reach 3d than 4s, and they fill up 4p before 4d, and so forth. ... The energy is lower for 6s than 4f, and 4f and 5f are lower in energy than the final D level.

Answer:

Earth’s ____gravity_____ (g) is nearly the same at any point on its surface.

The value of g near Earth’s surface is _ten__ meters per second squared (__10 (preciesly it is 9.8)___ m/s2).

If m is the mass of an object and g is gravity, then we can find the weight, W, of the object by using the

formula W = __m×g__.

The weight of an object is approximately equal to _g__ ______________ if the mass of the object is 1 kilogram on Earth, where g = __10 (9.8)___ m/s2 fill in the blank

Explanation:

therefore the correct option is d) 4.1×10⁻³.

Given that the initial concentration of HZ is 5.0 moles and at equilibrium, 8.7% of the acid has become hydronium.

The concentration of HZ that has not reacted is (100% - 8.7%) = 91.3%.

The final concentration of HZ is 5.0 × 0.913 = 4.565 moles.

The final concentration of the hydronium ion is 5.0 × 0.087 = 0.435 M.HZ ⇌ H+ + Z-Ka

= [H+][Z]/[HZ]Ka

= [H+][Z]/[HZ]

= [0.435]² / 4.565

= 0.041

Which is the same as 4.1 × 10-3.

We know that HZ is an acid that will partially ionize in water to give H+ and Z-.

The chemical equation for this reaction can be written as HZ ⇌ H+ + Z-.

The acid dissociation constant (Ka) of HZ is the equilibrium constant for the reaction in which HZ ionizes to form H+ and Z-.Thus, Ka = [H+][Z]/[HZ].

The given problem is a typical example of the dissociation of a weak acid in water. We are given the initial concentration of HZ and the concentration of hydronium ions at equilibrium.

To find the equilibrium concentration of HZ, we can use the fact that the total amount of acid is conserved.

At equilibrium, 8.7% of HZ has dissociated to give hydronium ions.

This means that 91.3% of the original HZ remains unreacted.

Therefore, the concentration of HZ at equilibrium is 5.0 × 0.913 = 4.565 M.

The concentration of hydronium ions at equilibrium is 5.0 × 0.087 = 0.435 M.

Using the equation Ka = [H+][Z]/[HZ], we can substitute the values of the concentrations and the equilibrium constant into the equation and solve for Ka.

Ka = [H+][Z]/[HZ]

= [0.435]² / 4.565

= 0.041 or 4.1 × 10-3.

The answer is d) 4.1 × 10-3.

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True , A catalyst is a substance that quickens a chemical reaction; therefore, in homogeneous catalysis, the catalyst and reactants are in the same phase. Most of the time, everything will exist as a gas or be contained within a single liquid phase.

The difference between heterogeneous and homogeneous catalysts is that the former are in the same phase as the latter are not.

A single phase is what is meant by the notion of a pure substance or homogenous mixture. There are two or more phases in a heterogeneous mixture. Water and oil do not mix uniformly when combined; instead, two distinct layers are created.

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Answer

Climate, because this describes what the weather is like over a long period of time.

The correct answer is option (c) Ti4+.

The species which are attracted to a magnetic field are known as paramagnetic species. If we talk about the given options, then we can see that there are only 3 species that are given. Out of these three, only Ti4+ is paramagnetic. How can we determine whether a species is paramagnetic or not? The species which contain unpaired electrons are paramagnetic in nature. If there are all paired electrons, then the species are diamagnetic. If we talk about Ti4+, then it contains 2 unpaired electrons, which makes it paramagnetic. This is the reason why the correct answer is Ti4+.In Ar, all the electrons are paired, which makes it diamagnetic. In O, there are 2 unpaired electrons, which makes it paramagnetic. How can we determine whether a species is paramagnetic or not? The species which contain unpaired electrons are paramagnetic in nature. If there are all paired electrons, then the species are diamagnetic.

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1. Gravitational lensing is the phenomenon that we call a massive object that can distort the light of more distant objects behind it.

2. WIMPs (weakly interacting massive particles) are defined as subatomic particles that have more mass than neutrinos but do not interact with normal matter.

3. The rotation curves of spiral galaxies provide strong evidence for the existence of dark matter.

4. Baryonic matter made from atoms with nuclei consisting of protons and neutrons, represents what we call ordinary matter.

5. Models show that the evolution of the universe is better-explained when we include the effects of dark matter along with the effects of luminous matter.

6. Matter consisting of particles that differ from those found in atoms is generally referred to as exotic matter.

What is dark matter? Dark matter is a kind of matter that scientists assume to exist since it does not interact with light and cannot be seen through telescopes. Dark matter is believed to account for approximately 27% of the matter in the universe. Dark matter interacts gravitationally with visible matter and radiation, but it doesn't interact with electromagnetism, making it completely invisible to telescopes that observe electromagnetic radiation, such as radio waves, infrared light, visible light, ultraviolet light, X-rays, and gamma rays.

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Answer:

oxygen . 1 percent and 4 percent the are the awnsers

The element most abundant in Earth’s crust is oxygen. The percentage of titanium in the earth's crust is 1%.

The abundance of the elements is a measurement of the occurrence of one particular chemical element relative to all other elements in our environment.

The nine most abundant elements in the Earth's crust: oxygen(O) 46%, silicon (Si) 28%, aluminum (Al) 8.3%, iron (Fe) 5.6%, calcium (Ca) 4.2%, sodium (Na) 2.5%, magnesium (Mg) 2.4%, potassium (K) 2.0%, Other elements occur less than 0.15%.

The most abundant chemical element in the earth’s crust is oxygen (46%). The abundance of hydrogen is only 0.14%(percent by mass) in the earth’s crust which is the 10th most abundant element on the earth.

From the given graph, oxygen is the most abundant element in the earth's crust and the percentage of the abundance of titanium is 1% and calcium is 4%.

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Answer:

thank you for this oibnki

Answer:

Sure I'll go ahead and like your answers and follow you if that's what you wanted! :)

Explanation:

Answer:

Signal A has a longer wavelength than signal B.

Explanation:

To know the the correct answer to the question given above, we shall determine the energy and the wavelength of both radio signals.

This is illustrated below:

1. Determination of the energy of both radio signals

i. Energy of signal A

Frequency (f) = 98.7 MHz = 98.7×10⁶ Hz

Planck's constant (h) = 6.63×10¯³⁴ Js

Energy (E) =.?

E = hf

E = 6.63×10¯³⁴ × 98.7×10⁶

E = 6.54×10¯²⁶ J

ii. Energy of signal B

Frequency (f) = 100.3 MHz = 100.3×10⁶ Hz

Planck's constant (h) = 6.63×10¯³⁴ Js

Energy (E) =.?

E = hf

E = 6.63×10¯³⁴ × 100.3×10⁶

E = 6.65×10¯²⁶ J

2. Determination of the wavelength of both radio signals.

i. Wavelength of signal A:

Frequency (f) = 98.7 MHz = 98.7×10⁶ Hz

Velocity (v) = 3×10⁸ m/s

Wavelength (λ) =?

v = λf

3×10⁸ = λ × 98.7×10⁶

Divide both side by 98.7×10⁶

λ = 3×10⁸ / 98.7×10⁶

λ = 3.04 m

ii. Wavelength of signal B

Frequency (f) = 100.3 MHz = 100.3×10⁶ Hz

Velocity (v) = 3×10⁸ m/s

Wavelength (λ) =?

v = λf

3×10⁸ = λ × 100.3×10⁶

Divide both side by 100.3×10⁶

λ = 3×10⁸ / 100.3×10⁶

λ = 2.99 m

The above calculation is summarised in the table below:

Signal >> Energy >>>>> Wavelength

A >>>>>> 6.54×10¯²⁶ >> 3.04

B >>>>>> 6.65×10¯²⁶ >> 2.99

From the above illustration,

1. Signal A has lesser energy than signal B.

2. Signal A has a longer wavelength than signal B.

Answer:

The cathode is the electrode where reduction takes place.

so

reduction occur in Cathode in an electrochemical cell.

Answer: Cathode

Explanation:

.

Answer:

D

Explanation:

none of these is the answer

Answer: The answer is: D

Explanation: none of these

Infrared light can be used to measure molecular polarity. Therefore, the correct option is option D.

A molecule or its chemical groups have an electric dipole moment with a negatively charged end and a positively charged end when they are polar, which in chemistry is the separation of electric charge. Because the bonded atoms' electronegativity differs, polar compounds must have one or more polar bonds. If the bond dipoles cancel one other out via symmetry, molecules with polar bonds are not polar. Infrared light can be used to measure molecular polarity. Dipole-dipole intermolecular forces and hydrogen bonding are how polar molecules communicate with one another. Many physical characteristics, including as surface tension, solubility, and melting and boiling points, are based on polarity.

Therefore, the correct option is option D.

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Metals and nonmetals gain stability by losing or gaining electrons to form ions with stable valence electron configurations. This type of bonding is called ionic bonding.

Ionic bonding is a type of chemical bonding where ions are formed from the transfer of electrons between a metal and nonmetal. Metals tend to lose electrons to become positively charged cations, while nonmetals tend to gain electrons to become negatively charged anions.

The resulting oppositely charged ions attract each other and form a crystal lattice structure, creating an ionic bond. This type of bonding typically occurs between elements with a large electronegativity difference, such as metals and nonmetals, and results in the formation of compounds known as ionic compounds or salts.

Ionic compounds have high melting and boiling points, are typically solid at room temperature, and are electrically conductive when molten or dissolved in water.

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Answer:

At -20°C the mercury state will be liquid

Explanation:

The melting point of a substance is the temperature at which it changes from solid state to a liquid state, and the boiling point is the temperature at which it changes from liquid state to a gaseous state.

If mercury melts at -39°C and boils at 356.9°C, it means that if the temperature is lower than -39°C, mercury will remain al solid state. Between -39°C and 356.9°C, the state of mercury will be liquid and, above 356.9°C mercury will remain at gaseous state.

So, at -20°C the mercury state will be liquid, because that temperature it is between -39°C and 356.9°C.