Why do bases dissociate in water?
They are polar
They are non polar
They are ionic bonded
They are covalent bonded

Answer:

1.583 moles

Explanation:

Rounded Atomic Mass of Au = 197 grams

\(\frac{312}{197} =1.5837, 1.584\)

A molecule or subunit that functions alone or combines with other similar molecules to form a polymer. All of the biomolecules that make up our cells are made up of strings of monomers. For example, proteins are made up of strings of amino acids and nucleic acids are strings of nucleotides.

Answer:

the porson above me is right

Isotopes undergo radioactive decay because thermodynamics generally governs the situation. Every atom strives to have the greatest degree of stability. When the number of protons and neutrons in the atomic nucleus is out of balance, instability results in radioactive decay. In essence, the nucleus contains too much energy to keep all the nucleons together.

Radioactive decay a the spontaneous process through which an unstable atomic nucleus breaks into smaller, more stable fragments.

Three Types of Radioactive Decay:

Alpha Decay:

       When an alpha particle basically a helium nucleus with two protons and two neutrons is ejected, the parent's atomic number and mass number are reduced by two and four, respectively.

Beta Decay:

      A stream of electrons from the parent, known as beta particles, is released during beta decay, and a neutron in the nucleus is changed into a proton. The new nucleus has the same mass number, but an additional atomic number of one.

Gamma Decay:

        The atomic nucleus releases extra energy during gamma decay in the form of high-energy photons (electromagnetic radiation). The resultant nucleus takes on a more stable energy state while maintaining the same atomic number and mass number.

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Answer:

Statement A is correct

Positive charges are located in the nucleus, and negative charges are located in the space around the nucleus. Parts of the atom  with zero charge are located in the nucleus

Explanation:

The electron is subatomic particle that revolve around outside the nucleus and has negligible mass. It has a negative charge.

Symbol= e-

Mass= 9.10938356×10⁻³¹ Kg

It was discovered by j. j. Thomson in 1897 during the study of cathode ray properties.

Proton and neutron:

While neutron and proton are present inside the nucleus. Proton has positive charge while neutron is electrically neutral. Proton is discovered by Rutherford while neutron is discovered by James Chadwick in 1932.

Symbol of proton= P⁺  

Symbol of neutron= n⁰  

Mass of proton = 1.672623×10⁻²⁷ Kg

Mass of neutron = 1.674929×10⁻²⁷ Kg

An atom consist of electron, protons and neutrons. Protons and neutrons are present with in nucleus while the electrons are present out side the nucleus.

All these three subatomic particles construct an atom. A neutral atom have equal number of proton and electron. In other words we can say that negative and positive charges are equal in magnitude and cancel the each other. For example if neutral atom has 6 protons than it must have 6 electrons. The sum of neutrons and protons is the mass number of an atom while the number of protons are number of electrons is the atomic number of an atom.

An experiment that could prove all cells come from preexisting cells would involve observing the process of cell division under a microscope.

To prove all cells come from preexisting cells, we can do the following steps. First, obtain a sample of living cells, such as a slice of the onion root tip. Place the sample on a microscope slide and add a stain to make the cells more visible. Next, use a microscope to observe the sample at high magnification. Look for cells that are in the process of dividing, which can be identified by the presence of a structure called the mitotic spindle.
Observe the process of cell division over time, noting how the parent cell divides into two daughter cells. Repeat this process with multiple samples to ensure that the results are consistent.

This experiment demonstrates that all cells come from preexisting cells, as new cells are created through the process of cell division. Without a parent cell, new cells cannot be formed.

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Ionic and covalent bonds are two types of chemical bonds. An ionic bond is formed between a metal and a nonmetal, while a covalent bond is formed between two nonmetals. Most Ionic: Sr-Br > Na-Br > P-Br > Cl-Br > Br-Br. Most Covalent: Br-Br > Cl-Br > P-Br > Na-Br > Sr-Br

The degree of ionic or covalent character in a bond depends on the electronegativity difference between the atoms that form the bond. The electronegativity difference between the atoms in a bond is a measure of how strongly each atom attracts the shared electrons.

The greater the electronegativity difference, the more ionic the bond will be, and the smaller the electronegativity difference, the more covalent the bond will be.

Using the electronegativity values of the atoms involved, we can rank the bonds from most ionic to most covalent as follows: Most Ionic: Sr-Br > Na-Br > P-Br > Cl-Br > Br-Br. Most Covalent: Br-Br > Cl-Br > P-Br > Na-Br > Sr-Br

Sr-Br and Na-Br are both ionic bonds, with Sr being a more electropositive metal than Na, resulting in a greater electronegativity difference and a more ionic bond. P-Br and Cl-Br are both polar covalent bonds, with Cl being more electronegative than P, resulting in a greater electronegativity difference and a more polar bond.

Finally, Br-Br is a nonpolar covalent bond with no electronegativity difference between the two Br atoms. Overall, the trend in bond character goes from most ionic with the largest electronegativity difference to most covalent with the smallest electronegativity difference.

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One method that can be used to prevent leaching of toxic substances through leather work gloves during the scene examination is by using a barrier layer between the glove and the skin.

This barrier layer can be made of a material such as nitrile or latex, which can help to prevent toxic substances from coming into contact with the skin. Additionally, it is important to regularly inspect the gloves for any signs of wear or damage, and to replace them as needed. This can help to ensure that the gloves are providing adequate protection against toxic substances during the scene examination.

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"To insure proper operation of an oxygen cylinder regulator, make sure no oil residue is present" is true because oil residue can compromise the functioning of an oxygen cylinder regulator.

Explanation: It is true that to ensure proper operation of an oxygen cylinder regulator, it is important to make sure that no oil residue is present. Oxygen cylinders contain highly concentrated oxygen that can react violently with oil or grease, leading to combustion or explosions. Oil residue can contaminate the regulator and pose a significant safety risk.

Therefore, it is crucial to keep oxygen cylinders and their regulators free from any oil or grease to maintain safe and proper functioning.

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The correct equation for the balanced reaction between chromium (Cr) and chlorine (Cl₂) to form chromium chloride (CrCl₃) is:

2 Cr + 3 Cl₂ → 2 CrCl₃

In this reaction, 2 atoms of chromium react with 6 atoms of chlorine (3 molecules of Cl₂) to produce 2 molecules of chromium chloride. This equation is balanced because there are equal numbers of each type of atom on both sides of the equation.

It is important to have a balanced reaction in order to accurately represent the quantities of reactants and products involved in the reaction.

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From 8.00 mol of iron, 574.8 grams of iron oxide (FeO) are produced, assuming complete reaction according to the balanced equation.

determine the grams of iron oxide produced from 8.00 mol of iron (Fe), we need to use the balanced chemical equation and the molar ratios between the reactants and products.

The balanced chemical equation for the reaction is:

2Fe + O2 -> 2FeO

From the equation, we can see that the molar ratio between iron (Fe) and iron oxide (FeO) is 2:2, or simply 1:1.

Given that we have 8.00 mol of iron, we can directly conclude that we will also produce 8.00 mol of iron oxide. This is because the stoichiometry of the reaction indicates that the number of moles of iron and iron oxide will be the same.

Convert the moles of iron oxide to grams, we need to multiply by the molar mass of FeO, which is calculated as follows:

FeO: Fe (atomic mass = 55.85 g/mol) + O (atomic mass = 16.00 g/mol) = 71.85 g/mol

Now, we can calculate the grams of iron oxide produced:

8.00 mol FeO × 71.85 g/mol FeO = 574.8 g

Therefore, 8.00 mol of iron will produce 574.8 grams of iron oxide.

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The given chemical reaction is: HCl + NaOH → NaCl + H2O. It is a neutralization reaction and also double displacement reaction. Option b.

The reaction given is a neutralization reaction as this reaction is between an acid and a base and the end result of the reaction is to form salt and water. As, Hydrochloric acid (HCI) is an acid and Sodium hydroxide (NaOH) is a base, it will produce water and a salt, sodium chloride (NaCI) when they react with each other. Hence, option B is correct. Neutralization and double displacement are the two ways through which the given reaction can be classified.

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The pressure of 0.0158 mole of methane in a 0.275 L flask at 27 °C is approximately 4.42 atm.

To calculate the pressure of the methane in the flask, we can use the ideal gas law equation:

PV = nRT

Where:

P = Pressure (in atm)

V = Volume (in liters)

n = Number of moles

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

T = Temperature (in Kelvin)

First, let's convert the temperature from Celsius to Kelvin:

T(K) = T(°C) + 273.15

T(K) = 27 + 273.15

T(K) = 300.15 K

Now we can substitute the given values into the ideal gas law equation:

P * 0.275 = 0.0158 * 0.0821 * 300.15

Solving for P:

P = (0.0158 * 0.0821 * 300.15) / 0.275

P ≈ 4.42 atm

Therefore, the pressure of 0.0158 mole of methane in a 0.275 L flask at 27 °C is approximately 4.42 atm.

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Answer:

false

Explanation:

the pressure exerted by a gas or liquid can move in all directions whether the fluid is still, if it's moving at a constant speed or if it's changing speed!

The mixture of NH4Cl and CH3NH2 in aqueous solution would be an effective buffer solution.

The mixture of HCOOH and NaHCOO would be an effective buffer solution. The other options would not be effective buffer solutions because they either do not contain a weak acid and its conjugate base or the pKa values of the weak acid and its conjugate base are too far apart.

A buffer solution is a solution that resists a change in pH upon addition of small amounts of acid or base. The buffer capacity of a solution depends on the concentrations of the weak acid and its conjugate base. In this case, HCOOH (formic acid) is a weak acid and NaHCOO (sodium formate) is its conjugate base.

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The molarity of the HCl solution is 1.22 M.

To solve this problem, we need to use the balanced equation provided:

NaOH + HCl → NaCl + H2O

The reaction shows that one mole of NaOH reacts with one mole of HCl to form one mole of NaCl and one mole of water. This means that the number of moles of NaOH used in the titration is equal to the number of moles of HCl present in the solution.

First, let's calculate the number of moles of NaOH used in the titration:

moles NaOH = M x V
moles NaOH = 0.900 M x 0.0540 L
moles NaOH = 0.0486 mol

Since the reaction is 1:1, the number of moles of HCl is also 0.0486 mol. To find the molarity of the HCl solution, we need to divide the number of moles by the volume of the HCl solution used in the titration (40.0 mL or 0.0400 L):

Molarity HCl = moles HCl / volume HCl
Molarity HCl = 0.0486 mol / 0.0400 L
Molarity HCl = 1.22 M

Therefore, the molarity of the HCl solution is 1.22 M.

In conclusion, we used the balanced equation provided to determine the molarity of the HCl solution. We found that the molarity of the HCl solution is 1.22 M by dividing the number of moles of HCl by the volume of the HCl solution used in the titration.

This calculation shows the importance of using balanced equations and stoichiometry in solving chemical problems, which allows us to determine the amount and concentration of substances involved in a reaction.

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Explanation:

byju's ig. Cause it gives a proper concept

The equilibrium equation for the salt AB can be represented as;AB ⇌ a^+ + b^-Ksp= [a^+] [b^-]The solubility product for the salt AB.

Ksp is given by the product of the molar concentration of the two ions raised to their respective powers. For the given equilibrium, the concentration of b^- is 8.3 × 10^-7 M, then the solubility product can be calculated by substituting the concentration of b^- into the equilibrium equation.Ksp = [a^+] [8.3 × 10^-7].Hence, the solubility product for the salt AB can be determined by multiplying the concentration of the ions raised to their respective powers. In this case, the concentration of b^- is 8.3 × 10^-7 M, then the solubility product can be calculated by substituting the concentration of b^- into the equilibrium equation.

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In the long version of the Periodic table, the elements Lithium (Li), Sodium (Na), Potassium (K), Rubidium (Rb), Caesium (Cs), and Francium (Fr) collectively make up one group. Because their oxides and hydroxides are soluble in water and produce a potent alkaline (basic) solution, these metals are collectively referred to as alkali metals.

Alkali metals' distinctive flame colors—red, yellow, violet, crimson, and blue for Li, Na, K, Rb, and Cs, respectively—are qualitative markers of the contemporary analytical techniques used to calculate the quantities of alkali-metal salts in aqueous solution.

Most other metals are harder than alkali metals. The most reactive elements in this category are cesium and francium.

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One calcium ion \((Ca2^+)\)and two bromide ions\((Br^-)\)are produced when \(CaBr^2\) (calcium bromide) dissolves in water.

The ionic compound calcium bromide \((CaBr^2)\) is made up of calcium cations \((Ca2^+)\)and bromide anions \((Br^-)\)in a 1:2 ratio. It is a crystalline white substance that is very soluble in both alcohol and water.

Therefore, One \(Ca2^+\) ion and two Br- ions are produced by each formula unit of\(CaBr^2\) in solution. This is due to the fact that the ionic compound \(CaBr^2\) dissociates in water, causing the compound to separate into its individual ions, which are then solvated by water molecules.

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One way to rephrase it is to say: "All life depends on photosynthesis because plants use the sun's energy to make oxygen for animals to breathe. Also, animals rely on plants for energy when they eat the plants"

Answer:

The answer is

Explanation:

The mass of a substance when given the density and volume can be found by using the formula

From the question

volume of silver = 0.25 cm³

density = 10.5 g/cm³

The mass is

mass = 10.5 × 0.25 = 2.625

We have the final answer as

Hope this helps you

Answer:

it may be +1 or -1 hope this help

An atom is a kind of stuff that cannot be further decomposed chemically. Therefore, the charge on a single proton is +1.

The building block of an element is an atom. An atom is a kind of stuff that cannot be further decomposed chemically. The three main components of an atom are protons, neutrons, plus electrons.

Some substances are either bigger or smaller than atoms. Instances of chemical species that aren't commonly regarded as atoms include protons, neutrons, and electrons, which are atom-related particles. Atoms make up molecules and compounds, however they are not actual atoms. Salt is an example of a molecule and a compound (NaCl). The charge on a single proton is +1.

Therefore, the charge on a single proton is +1.

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Answer:

8.1293534120006496

Explanation:

hope this helps

Answer:

This is my own explanation:

Explanation:

It is important to know the mixtures you input together because you may determine the type of substance you produced from different elements and several combinations of matter. This assists in identifying your specific substance.

Rate law for the following elementary reactions is given as follows:¹⁴6C → ¹⁴7N + ß particle (nuclear decay)Rate law = k [¹⁴6C], Here, k is the rate constant.

a) CH3NC(g) → CH3CN(g)

Rate law = k [CH3NC]Here, k is the rate constant.

b) O3(g) + NO(g) → O2(g) + NO2(g)

Rate law = k [O3] [NO]

Here, k is the rate constant.

c) O3(g) → O2(g) + O(g)

Rate law = k [O3]

Here, k is the rate constant.

d) O3(g) + O(g) → 2O2(g)

Rate law = k [O3] [O]

Here, k is the rate constant.

e) ¹⁴6C → ¹⁴7N + ß particle (nuclear decay)Rate law = k [¹⁴6C]

Here, k is the rate constant.

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Because of different steric interactions, the most stable conformer is the anti conformer. The second-most stable conformer is the gauche conformer.

The two eclipsed conformations, which are the other forms we have examined, are not at all stable. A bottle of butane gas contains enough energy at room temperature for each of the molecules to be able to spin their bonds and sample several forms. As a result of each molecule spending the majority of its time in the most stable conformation, the majority of the molecules will always be located in the anti conformer.

The gauche conformer, which is the second-most stable shape, will contain some of the molecules. Since there are points of greatest energy, none of the molecules will be found in the eclipsed conformations. The molecules have enough energy to rotate partially through an eclipsed configuration and occasionally, but not always, they will not stop there. They will instead continue to rotate till they reach a further staggered conformer.

A butane molecule spends most of its time in the anti conformer.

A butane molecule spends some of its time in the gauche conformer.

A butane molecule spends almost noe of its time in eclipsed conformations.

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Oxidation of a 24-carbon fatty acid would require ELEVEN (11) rounds of beta-oxidation and TWELVE (12) rounds of the Krebs cycle. It is part of cellular respiration.

Cellular respiration is a group of chemical reactions by which aerobic cells can produce ATP by using energy from foods.

Cellular respiration has three parts: glycolysis, the Krebs cycle (also called the acid citric cycle) and oxidative phosphorylation.

During the Krebs cycle, hydrogen atoms or electrons pass through a series of hydrogen/electron carriers.

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