what is the empirical formula of a compound containing 35.4% of sr and 64.6% of br

4.25 g Zn did react if 10.0 g of zn powder is added into a solution of silver nitrate, agno3. the total mass of the metallic solid recovered at the end of the reaction is 12.32 g.

So the equation I got what

Zn (s) + 2AgNO3 (aq) -> 2Ag (s) + Zn(NO3)2 (s)

I think the zinc nitrate is solid because the question asks about a metallic solid.

Then,

12.32 g X 1 mol/189.41 g Zn(NO3)2 = .065 mol Zn(NO3)2

Then to find the original Zn,

.065 mol X 1 mol Zn/1mol Zn(NO3)2 = .065 mol Zn

.065 mol Zn X 65.39 g/1 mol = 4.25 g Zn.

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The initial rate is determined through multiplication of initial concentration of a thiosulfate ion by half in a Kinetics of the Iodine Clock Reaction procedure. Hence correct choice is thiosulfate ion.

A popular demonstrative reaction in chemistry courses that typically calls for toxic or dangerous substances is the iodine clock reaction. 2 clear liquids are combined in the process to produce a third clear liquid. After a while, the solution abruptly changes to a dark blue color.

The starch & the iodine do exchange some electrical charges. The distances between energy levels are altered as a result, changing the electron configurations. The complex gets its vivid blue color from the additional spacings, which preferentially absorb visible light.

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The complete question is -

In the Kinetics of an Iodine Clock Reaction procedure, the initial rate is calculated by multiplying the initial concentration of ______________ by half, and dividing by the elapsed time as measured with ___________.

Answer-

thiosulfate ion and stop watch are filled in blank area.

The oxidation state of an atom in a molecule is a measure of the charge it would have if the bonds in the molecule were 100% ionic. To determine the oxidation state of an atom, you can use the following rules:

The atom is a basic unit of matter, consisting of an atomic nucleus and a cloud of negatively charged electrons that surrounds it. The atomic nucleus consists of positively charged protons and neutrally charged neutrons (except in the atomic nucleus of Hydrogen-1, which has no neutrons).

The electrons in an atom are bound to the nucleus by electromagnetic forces. A collection of such atoms can also bond with each other, and form a molecule. Atoms containing the same number of protons and electrons are neutral, while those containing a different number of protons and electrons are positive or negative and are called ions. Atoms are grouped based on the number of protons and neutrons contained in the atomic nucleus. The number of protons in an atom determines the chemical element of that atom, and the number of neutrons determines the isotope of that element.

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A certain substance X has the normal freezing point of -10.1 °C and the molal freezing point depression constant Kf = 5.32 °C.kg. mol⁻¹.  The freezing point of a solution is - 15.4 °C.

The Molal freezing point depression constant = 5.32 °C kg mol⁻¹

The Mass of urea (solute) = 29.82 g

The Mass of solvent = 500 g  = 0.500 kg

The Molar mass of urea = 60.06 g/mole

The expression is as follows :

ΔT = i k m

T - Ts = i k × ( mass of urea / molar mass of urea × mass of solvent )

Where,

Ts = freezing point of solution

T = freezing point of solvent =  -10.1  °C

i = 1 , Van't Hoff factor

k = freezing point constant = 5.32 °C kg mol⁻¹

T - Ts = i k × ( mass of urea / molar mass of urea × mass of solvent )

- 10.1 - Ts = 1 × 5.32 ( 29.82 / 60.06 × 0.500)

Ts = - 15.4 °C

This question is incomplete, the complete is :

A certain substance X has a normal freezing point of -10.1  °C and a molal freezing point depression constant Kf = 5.32 °C.kg. mol⁻¹. Calculate the freezing point of a solution made of 29.82 g of urea ((NH₂)₂CO) dissolved in 500 g .

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82.7 g Na2SO4 should be added to 340. g of water to make a solution with a colligative molality of 0.420 m

Calculate the number of moles of Na2SO4 needed:

0.420 m * (340 g H2O / 1000 g H2O)

= 0.142 moles Na2SO4

Convert moles to grams:

0.142 moles * 142 g/mo

l = 20.2 g Na2SO4

Add 82.7 g Na2SO4 to 340 g H2O to make the 0.420 m solution.

Note: Molarity (M) is the number of moles of solute per liter of solution, while molality (m) is the number of moles of solute per kilogram of solvent (water).

82.7 g Na2SO4 should be added to 340. g of water to make a solution with a colligative molality of 0.420 m

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The average atomic mass of the isotope is 70.64.

Isotopes are different forms of the same element that have the same number of protons but different numbers of neutrons. An element with two isotopes has two distinct mass numbers, and their relative abundances can be calculated based on their molecular masses and their natural occurrences.

In this case, the element has two isotopes: one with a mass number of 69 and an abundance of 60.11%, and the other with a mass number of 71 and an abundance of 39.89%. To calculate the average atomic mass of the isotope, we need to multiply the mass of each isotope with its respective abundance and add them up.

So, 69.0 × 0.6011 + 71.0 × 0.3989 = 41.7069 + 28.9369 = 70.6438.

Therefore, the average atomic mass of the isotope is 70.64 to four significant figures. It's important to note that this value represents the weighted average of the masses of all isotopes of the element and gives an approximation of the average atomic mass of the element in nature.

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In the given query, none of the options presented are the same size as one mole of gas at STP. At STP, one mole of petrol has a volume of 22.4 L, which is larger than a marble but smaller than a car or an elephant.

At STP (standard temperature and pressure), the temperature is 273 K and the pressure is 1 atm. One mole of an ideal gas at STP occupies a volume of 22.4 L.

To determine which of the items is closest in size to one mole of gas at STP, we need to use the ideal gas law, which relates the pressure, volume, temperature, and number of moles of gas.

A) A car is much larger than one mole of gas at STP, so it is not the correct option.

B) An elephant is also much larger than one mole of gas at STP, so it is not the correct choice.

C) A microwave is much smaller than one mole of gas at STP, so it is not the correct option.

D) A marble is much smaller than one mole of gas at STP, so it is not the correct choice.

Therefore, none of the options provided is closest in size to one mole of gas at STP. One mole of gas at STP occupies a volume of 22.4 L, which is much larger than a marble and much smaller than a car or an elephant.

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If the recrystallization mixture is cooled too quickly, it can result in the formation of small, poorly formed crystals. When cooling happens too rapidly, there is not enough time for the solute molecules to arrange themselves in an orderly fashion and form large, well-formed crystals.

Instead, the solute molecules will form many small, irregularly shaped crystals, which can make it difficult to separate them from the solvent during filtration.

This can result in an impure product with low yield, as well as longer processing times and increased difficulty in purifying the solute.

Additionally, small crystals can also cause difficulties during the washing and drying process, as they tend to stick together and are more difficult to handle.

It is important to control the cooling rate during recrystallization to ensure that well-formed crystals are produced.

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Answer:

200N backward

Explanation:

In Newton's third law of motin, every action has equal and opposite reaction

Alpha decay is the correct answer .

What is Proton ?

A proton is a subatomic particle that is found in the nucleus (center) of an atom. It is positively charged and has a mass of approximately 1 atomic mass unit. The number of protons in an atom's nucleus is called its atomic number, which determines the element the atom is. For example, all hydrogen atoms have one proton and all helium atoms have two protons. Protons are one of the building blocks of matter and are essential for the stability of atoms. They participate in a variety of chemical reactions, such as those that form molecules, and also play a crucial role in nuclear reactions, such as those that take place in the sun to produce energy.

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If each step in the reaction has a 90.0% yield, then to make 460 g of nitrogen dioxide, you would need to start with:

of the intermediate product, which would then require:

So yo would need 567 g of nitrogen to make 460 g of nitrogen dioxide.

Nitrogen dioxide is a chemical compound with the formula NO₂. One of several nitrogen oxides, NO₂ is used as a synthetic material for the manufacture of nitric acid, which produces millions of tonnes annually. Nitrogen dioxide (NO 2 ) is a major contributor to smog formation and a precursor to many harmful secondary pollutants, including ozone and particulate matter. It is highly reactive with other chemicals and is a strong oxidizing agent. Nitrogen dioxide is a dark red-orange gas.

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(a) The quantity that, when graphed versus time, will yield a straight line for a second-order reaction is the inverse of the concentration of the reactants.

(b) The half-lives of first-order and second-order reactions differ in that the half-life of a first-order reaction is constant, while the half-life of a second-order reaction decreases with time.

What are the first order and second order reactions?

First order reactions involve a single reactant and have a rate proportional to the concentration of that reactant. This means that the reaction rate increases as the concentration of the reactant increases. A first order reaction will have a reaction rate constant ([tex]k[/tex]) that is independent of the concentration of the reactant.

Second order reactions involve two reactants and have a rate proportional to the concentration of both reactants. This means that the reaction rate increases as the concentration of both reactants increase. A second order reaction will have a reaction rate constant ([tex]k[/tex]) that is dependent on the concentrations of the reactants.

For example, The rate of the reaction can be expressed as:

[tex]Rate = k[A]\times [B]y[/tex]

Where k is the rate constant, [[tex]A[/tex]] is the concentration of [tex]A, [B][/tex] is the concentration of [tex]B[/tex], and x and y are the orders of the reactants [tex]A[/tex] and [tex]B[/tex], respectively.

If [tex]x = 1[/tex] and [tex]y = 0[/tex], then the reaction is first order in [tex]A[/tex] and zero order in [tex]B[/tex].

[tex]Rate = k[A][/tex]

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Ionic bonds, which hold the ions together, result in an ionic compound. In most cases, ionic compounds are created between metal and nonmetal components.

The full transfer of certain ions from one nucleus to another results in the formation of an ionic connection. A negatively charged ion known as a cation results from an atom losing three or more electrons. An anion, or negatively charged ion, is created when an atom gains one or more electrons.

The transfer of electrons between more than two atoms forms a covalent connection. When two maybe more ions join contact, they can create ionic bonds that are kept together by charging differences.

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Because of particles in liquid and solid phases are so close combined, they are referred to as condensed states of matter.

Bose-Einstein condensates (BEC), solid, liquid, gasses, plasma physics, and other forms of matter all have unique physical characteristics. Liquids fill containers, solids are frequently tough, and gases are all around us in the atmosphere. Each of these conditions is referred to as a phase.

Based on the physical attributes they represent, states of material are the categories into which matter is subdivided. They can be separated into the five different states of matter—solid, liquid, gas, liquid, and Bose-Einstein cloud.

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Hydrobromic acid is a strong acid formed by dissolving the diatomic molecule hydrogen bromide (HBr) in water.The reaction between HBr and [tex]H_{2} O[/tex] is a complete reaction. One mole of strong acid dissociates in water to yield one mole of [tex]H_{3} O{+}[/tex] and one mole of its conjugate base.

Between HBr and water, hydrogen bonding occurs. Because of this intermolecular hydrogen bonding, HBr is soluble in water.
The reaction between HBr and [tex]H_{2} O[/tex] does not produce a buffer solution. Because strong acids dissociate completely in solution, they cannot be used as a buffer.
The reaction between HBr and [tex]H_{2} O[/tex] is finished In water, one mole of strong acid dissociates to produce one mole of [tex]H_{3} O^{+}[/tex] and one mole of its conjugate base.

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The pH of the stomach is substantially lower than that of any other component of our digestive system, making it a storage area for powerful acids. The conditions here are ideal for enzyme activation.

The stomach's pH is typically between 1.0 and 2.0, which is very acidic. Salivary amylase's protein structure denatures and changes form at this pH level. As a result, when salivary amylase reaches the stomach, it is inactive.

The high acidity of the stomach contents (pH 1.5 to 3.5) is caused by HCl, which is also required to activate the pepsin protein-digesting enzyme.

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Answer:

false

Explanation:

when two substance look the same, but the smell is different then that means the chemical compounds of the substance are different so if their chemical composition is different then the substance is different.

hence proved

A one nucleotide in DNA can change in a point mutation. The severity of this mutation is often lower than that of a chromosomal change. Silent or nonsense mutations are two types of point mutations.

Any alteration to a cell's DNA sequence. Changes can happen as a consequence of environmental DNA-damaging agents being exposed to, or as a consequence of flaws in cell division.

Errors in Dna synthesis during cell replication, exposure to mutagens, or viral infection can all cause mutations. Somatic mutations (which happen in body cells) cannot be passed on to children, but germline mutations (which happen in eggs and sperm) may.

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The statement (b) An acid accepts hydrogen ions from a water-based solution is true about acids as an acid is a substance that donates hydrogen ions (H+) to a water-based solution.

An acid is a type of molecule or ion that donates hydrogen ions (H+) to a solution when dissolved in water. The release of hydrogen ions makes the solution more acidic, meaning it has a lower pH value (below 7) than a neutral solution, which has a pH of 7.

The strength of an acid is determined by its ability to donate hydrogen ions to a solution. Strong acids, such as hydrochloric acid (HCl), easily dissociate in water and release a large number of hydrogen ions, making the solution highly acidic. On the other hand, weak acids, such as acetic acid (CH3COOH), dissociate to a lesser extent and release fewer hydrogen ions, resulting in a solution that is only slightly acidic.

Acids play a crucial role in many chemical reactions, including those that occur in living organisms. For example, the human body produces and uses various acids, such as gastric acid, to help with digestion.

It's also important to note that not all substances that taste sour or cause corrosion are necessarily acids. The definition of an acid is based on its ability to donate hydrogen ions to a solution, not its taste or its effects on other substances.

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0.666g/ml is the density of a 50 g irregular solid with a volume 75 milliliters. Another way to state density is in kilograms per cubic meter.

Density is the mass of a specific material per unit volume. d = M/V, in which d is density, M is weight, and V is volume, is the formula for density. Grams per cubic centimeter are a typical unit of measurement for density.

For instance, whereas Earth has a density of 5.51 milligrams, water has a density of 1 milligrams. Another way to state density is in kilograms per cubic meter (in metre-kilogram-second or SI units).

density=mass/ volume

           =50 g /75 milliliters=0.666g/ml

Therefore, 0.666g/ml is the density of a 50 g irregular solid with a volume 75 milliliters.

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False. A closed system permits mass exchange with the environment but not energy.

The mass of a something is the total amount of stuff or materials that make it up. The kilogram, or kg, is the symbol for the measurement units. It's important to remember that mass is distinct from gravity. Mass never changes, whereas weight fluctuates as the center of gravity shifts.

Knowing an object's mass is essential since it allows you to determine that however much power will be needed to move it. It is common practice to calculate the mass of an unspecified object using recognized units of weight such milligrams, grams, and kilograms. Anything with both mass and quantity is considered to be matter.

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D is Chemical energy

Energy that is stored in substances

Answer:

b 48 atoms

Explanation:

When 0.165 grams of  protein is  dissolved in 40.7 ml of the solution at 21.9 °C, the osmotic pressure was found to be 49.2 torr. The molar mass of the protein is 1536.5 g /mol.

The mass of the protein = 0.165 g

The volume = 40.7 mL

The osmotic pressure = 49.2 torr = 0.064 atm

Temperature = 21.9 °C = 294.9 K

The osmotic pressure is expressed as :

π = M R T

Where,

π = osmotic pressure

M = molar concentration

R = constant

T = temperature

M = 0.064 / ( 0.082  × 294.9 )

M = 0.00264 M

Moles = molarity × volume

          = 0.00264 × 0.0407 L

         = 0.0001074 mol

Molar mass = mass / moles

                    = 0.165 / 0.0001074

                    = 1536.5 g /mol

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Phospholipids spontaneously form bilayers in aqueous solutions because their fatty acid tails are not highly soluble in water and exposed polar head groups that are interact with water.

A glycerol molecule is linked to two hydrophobic fatty acid chains by a negatively charged phosphate group to create phospholipids (which is hydrophilic). Due to its negative charges, which easily communicate with polar water molecules, the hydrophilic portion of the phospholipid is attracted to water molecules.

A single phospholipid molecule has two consecutive chains of fatty acids that make up the lipid "tails" and a phosphate group, which would be referred to as the "head," on the other end. The negatively charged phosphate group makes the head polar and hydrophilic, or "water loving," in origin. As a consequence, the water is dragged to the phosphate heads.

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Standard enthalpy of production for an isotope in its mean position is 0 by definition. F2(g) F 2 (g) as well as Hg(l) H g (l) are in their fixed positions among the chemicals listed.

Enthalpy is a property or condition function that mimics energy; it has the same dimensions as power generation and is thus quantified in kilowatt hours or ergs. The value of hysteresis is solely dependent on the temperature. pressure, and makeup of the system, not on the history.

The total energy content of such a body the with constant is equal to this enthalpy. You must realize that while energy may take different forms, enthalpy rarely changes.

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Yes, the process is spontaneous. When a gas condenses to a liquid, it releases heat, which is a characteristic of a spontaneous process.

This is because during condensation, the gas particles lose kinetic energy and thus release heat to the surrounding environment. The release of heat during condensation indicates that the process is occurring spontaneously, in the sense that it will proceed without any external intervention, such as the input of energy or work. The release of heat during condensation indicates that the process is occurring spontaneously, in the sense that it will continue to proceed on its own, without the need for any external input. In thermodynamics, spontaneous processes are typically associated with an increase in disorder or entropy, as the system moves towards a more disordered state.

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Complete question:

is the following process spontaneous? a gas condenses to a liquid, releasing heat.

A. No

B. Yes

C. Not enough information

The original concentration of the Pb(NO₃)₂ solution in mol/L would be 0.00036 moles / 0.64 L = 0.0000056 mol/L = 0.056 mM (rounded to 3 significant figures).

To determine the original concentration of the unknown Pb(NO₃)₂ solution, we need to perform a mass-to-moles conversion. The equation for the precipitation reaction between Pb(NO₃)₂ and H₂SO₄ is as follows:

Pb(NO₃)₂ + H₂SO₄ -> PbSO₄ + 2HNO₃

The molar mass of PbSO₄ is 303.2 g/mol. So, 0.109 g of PbSO₄ is equal to 0.109 g / 303.2 g/mol = 0.00036 moles of PbSO₄. Since the stoichiometry of the reaction is 1:1 between Pb(NO₃)₂ and PbSO₄, we can assume that the same number of moles of Pb(NO₃)₂ were present in the original solution. Therefore, the original concentration of the Pb(NO₃)₂ solution in mol/L would be 0.00036 moles / 0.64 L = 0.0000056 mol/L = 0.056 mM (rounded to 3 significant figures).

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Since 273 k – 243 k equals 30, the temperature change for an object going from 273 k to 243 k is 30 k.

Colors and temperatures can both be measured in Kelvin: A temperature unit commonly used in science is the Kelvin scale. Lord Kelvin created the scale after realizing the need for one with absolute zero as the zero point, which translates to 0 K as the lowest attainable temperature, or -273,15 °C.

On the Kelvin scale, a body's temperature cannot be negative. Since the Kelvin scale's absolute zero represents the lowest temperature that may exist, it is impossible for it to be negative.

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During RNA synthesis, the 3' hydroxyl (also called as the hydroxyl) of the preceding codon is modified by the phosphatase of an incoming sufficient to amount 

Phosphates are necessary for the generation of energy, the operation of muscles and nerves, and the growth of bones. For detecting the phosphate levels in malnourished individuals, ph tests are really quite helpful.

Phosphate is a naturally occurring form of phosphorous, and makes up 25% of all the minerals necessary for plant growth and maintenance. Phosphorous is a common feature in many goods and is necessary for the production of all fertilizers.

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