A physical change is a change to a substance that does not result in the formation of a new substance.
What is formation ?Formation is the process of creating something new. It can refer to the creation of an organization, structure, or system. It is often used in business, when a company is established, or when a new product or service is created. It can also refer to the development of an idea or concept, such as a strategic plan or marketing campaign. Formation is an essential part of any entrepreneurial venture, and involves the development of a plan for a business, including the selection of personnel, market research, and the development of a financial structure. Formation is also used to refer to the development of a team or organization, and the process of creating and maintaining a cohesive and effective team of individuals.
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One method for reclaiming silver metal from silver chloride results in a 94.6% yield. Calculate the actual mass of silver that can be produced in this reaction if 100.0 g of silver chloride is converted to silver metal. 2AgCl(s) → 2Ag(s) + Cl2(g)
If 100.0 g of silver chloride is converted, the amount of silver metal that would be produced would be 94.6 g.
What is mass?Mass is described as the quantitative measure of inertia which is a fundamental property of all matter.
The reaction formula ]provided is already balanced, therefore the molar ratio of silver chloride to silver metal is 1:1.
Therefore, if 100.0 g of silver chloride is converted, we can expect to produce 100.0 g of silver metal but the yield of the reaction is only 94.6%, which means that only 94.6 g of silver metal would actually be produced.
We can calculated as follows:
100.0 g × 0.946 = 94.6 g
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If 45g of salt reacts with silver nitrate what mass of silver chloride will be produced.
If 45g of salt reacts with silver nitrate. Therefore, 110.24g is the mass of silver chloride will be produced.
What is sodium chloride?Sodium chloride, also known as salt (though sea salt contains additional chemical salts), is just an ionic substance with both the chemical symbol NaCl, signifying a 1:1 ratio of chloride and sodium ions.
One mole of sodium chloride, NaCl, creates one mole of silver chloride, AgCl, according to the balanced reaction. NaCl has a molar mass of 58.5 g and AgCl has a molar mass of 143.2 g/mol.
As a result, 58.5 g of sodium chloride yields 143.2 g of silver chloride. As a result, the mass of silver chloride generated by 45 g of sodium chloride is as follows:
AgCl mass = (143.2 g 45 g)/58.5 g
= 110.24 g
Therefore, 110.24g is the mass of silver chloride will be produced.
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2 NH3 + 3 CuO g 3 Cu + N2 + 3 H2O
In the above equation how many moles of water can be made when 57 moles of NH3 are consumed?
Answer:
86 moles of H2O.
Explanation:
In the reaction 2 moles of NH3 reacts with 3 moles of CuO to produce 3 moles of Cu, 1 mole of N2 and 3 moles of H2O.
So, when 57 moles of NH3 are consumed, the amount of H2O produced will be 3 * 57 moles / 2 moles = 86 moles of H2O.
Given AH -86 kJ/mol and AS° = -478 J/mol K, determine AG and the spontaneity of the reaction A,(g) + 3 X₂(g) → 2 AX,(g) at 591 K.
A) +196 kJ/mol, spontaneous
B) +196 kJ/mol, nonspontaneous
C) +282 kJ/mol, nonspontaneous
D) +282 kJ/mol, spontaneous
E) -196 kJ/mol, spontaneous
A supersaturated solution can be prepared by dissolving solute in solvent while adding____. A supersaturated more servent solution contains more _____than can ordinarily be dissolved in the solvent detergent at room temperarte. A solution may remain supersaturated until_____is initiated, often by adding solid to the solution or by allowing solvent to evaporate.
By dissolving the solute in the solvent while adding heat, a supersaturated solution can be created. At room temperature, a supersaturated solution contains more solute.
than can normally be dissolved in the solvent. This is accomplished by dissolving the solute in a hot solvent and then progressively chilling the solution to allow the excess solute to stay dissolved, resulting in a supersaturated solution. A solution can stay supersaturated until a seed crystal is begun, which is usually accomplished by adding solid to the solution or allowing the solvent to evaporate. The seed crystal acts as a surface for surplus solute to crystallize and exit solution. The surplus solute quickly crystallizes out of solution once a seed crystal is introduced, resulting in a saturated solution.
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How much energy, in joules per mole (J/mol), does a photon in the microwave region of the EM spectrum, contain? Assume the microwave has a frequency of 5.25 x 1010 s-1. Your answer should have 3 significant figures.
The energy, in joules per mole (J/mol), of a photon in the microwave region of the EM spectrum is 5.81 x 10-3 J/mol (3 significant figures).
What is energy?Energy is the capacity for doing work. It can take many forms, including kinetic energy (the energy of moving objects), potential energy (stored energy in an object due to its position or composition), thermal energy (heat), light, and electrical energy.
The energy carried by a single photon is equal to the product of Planck's constant (h) and the frequency (f) of the photon.
Therefore, the energy carried by a single photon in the microwave region of the EM spectrum, with a frequency of 5.25 x 1010 s-1, is:
E = h x f
= (6.63 x 10-34 J.s) x (5.25 x 1010 s-1)
= 3.48 x 10-23 J
The energy per mole of photons is then equal to:
E/mol = (3.48 x 10-23 J) / (6.02 x 1023 photons/mol)
= 5.81 x 10-3 J/mol
Therefore, the energy, in joules per mole (J/mol), of a photon in the microwave region of the EM spectrum is 5.81 x 10-3 J/mol (3 significant figures).
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The following are the conjugate bases of some strong and weak acids. Which of these would you expect to act as a base if placed in aqueous solution? (1) HCOO (ii) HCO3 (iii) HSO4 (iv) H2PO4 (v) Br" (vi) F a.(i),(ii),(iv), and (vi) onlyb. (i),(ii),(iii),(iv), and (vi) onlyc. (iii) onlyd. (i),(ii),(iii),(iv) onlye. all of them
Due to the strength of their conjugate acids, I would anticipate that I (ii), (iv), and (vi) would behave as bases if put in an aqueous solution. As both alternatives (a) and (d) contain the conjugate bases of weak acids, they are both accurate.
Strong acids' conjugate bases, such as (v) Br- and (vi) F-, cannot take any more protons since they are already fully deprotonated and cannot function as bases in aqueous solutions. Strong acids have conjugate bases that may receive protons and function as bases in aqueous solutions. These bases include I HCOO-, (ii) HCO3-, (iii) HSO4-, and (iv) H2PO4-. As both alternatives (a) and (d) contain the conjugate bases of weak acids, they are both accurate. Because (v) and (vi), which are conjugate bases of strong acids and cannot function as bases, are included in Option (b), it is wrong. Option (c) is untrue because it only accounts for the conjugate bases of strong acids and ignores those of weak acids.
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think about the sugar and water as made up of tiny particles
Both sugar and water are made of molecules and atoms.
What is meant by atoms and molecules?A tiny or very small particle of a chemical element is known as an atom, which may or may not present independently. Molecules are defined as a groups of atoms has the bond fuse together which represents the smallest part of a compound. Two or more identical or different atoms are chemically bonded with each other.
The smallest particle of a material that has all of the physical and chemical properties of the material. Molecules are made up of only one or more than one atom. Sugar has a solid state of matter whereas water has a liquid state of matter. Sugar which is a solid has more hard particles as compared to water whereas a liquid has less compact particles.
So we can conclude that both are made of molecules and atoms.
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Part A
Calculate the freezing point of a solution containing 11.1 g FeCl3 in 153 g water.
Part B
Calculate the boiling point of the solution above.
Part C
Calculate the freezing point of a solution containing 6.0% KCL by mass (in water)
Part D
Calculate the boiling point of the solution above.
Part E
Calculate the freezing point of a solution containing 0.155 m MgF2
Part F
Calculate the boiling point of the solution above.
Answer:
no answer
Explanation:
I wish I could help you, but go to your text book for reference
A mixture of of hydrogen and of oxygen in a closed container is sparked to initiate a reaction.
When a mixture of hydrogen and oxygen in a closed container is sparked, it can undergo a combustion reaction, also known as a flame reaction. The reaction between hydrogen and oxygen is exothermic, releasing energy in the form of heat and light.
The balanced chemical equation for the combustion of hydrogen gas (H2) in the presence of oxygen gas (O2) is:
2H2 + O2 -> 2H2O
In this reaction, two molecules of hydrogen gas react with one molecule of oxygen gas to produce two molecules of water (H2O). The release of heat and light energy is due to the formation of new bonds in the water molecules, which requires energy to break the bonds in the hydrogen and oxygen molecules. This reaction is an example of an oxidation-reduction reaction, in which hydrogen acts as the reducing agent and oxygen acts as the oxidizing agent.
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What is the mass percent of water in IrBr₃･4 H₂O?
The mass percent of water in IrBr₃･4 H₂O is 14.4%.
How to calculate mass percent?To find the mass percent of water in IrBr₃･4 H₂O, first determine the mass of water present in the compound and then divide it by the total mass of the compound and multiply by 100 to express the answer as a percentage.
Let's assume that the molecular weight of IrBr3•4 H2O is 500 g/mol. In that case, the mass of water present in the compound would be 4 x 18 g/mol (the molecular weight of water) = 72 g. The total mass of the compound is 500 g, so the mass percent of water in IrBr₃･4 H₂O can be calculated as follows:
(72 g / 500 g) x 100 = 14.4%
So, the mass percent of water in IrBr₃･4 H₂O is 14.4%.
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Write an equation that shows the formation of a copper (ii) ion from a neutral copper atom
An equation that shows the formation of a copper (ii) ion from a neutral copper atom is Cu ⇒ Cu⁺² + 2e⁻.
What is oxidation ?Oxidation occurs when a reactant loses electrons during a reaction. Reduction occurs when a reactant accumulates electrons during a reaction. When metals react with acid, this is a common occurrence. Oxidation occurs when a reactant loses electrons during a reaction.
When an atom looses an electron to form positive ion, this process is called as an oxidation reaction.
Copper will lose 2 electron to form +2 ion. The equation for the formation of copper (II) ion from neutral copper atom follows:
Cu ⇒ Cu⁺² + 2e⁻
Thus, Cu ⇒ Cu⁺² + 2e⁻ is an equation that shows the formation of a copper (ii) ion.
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How many moles of gas would it take to fill an average man's lungs, total capacity of which is about 4.5 L. Assume 1.00 atm pressure and 37 degrees C
Answer:
0.0144 moles
Explanation:
To calculate the number of moles of gas in a volume of 4.5 liters, we use the ideal gas law, PV = nRT, where P is the pressure, V is the volume, n is the number of moles, R is the ideal gas constant, and T is the temperature in Kelvin.
First, we need to convert the temperature to Kelvin:
37°C = 37 + 273.15 = 310.15 K
Next, we can plug in the known values into the ideal gas law and solve for n:
PV = nRT
(1.00 atm)(4.5 L) = (n)(0.0821 Latm/mol K)(310.15 K)
n = (1.00 atm)(4.5 L) / [(0.0821 Latm/mol K)(310.15 K)] = 0.0144 moles
So, it would take approximately 0.0144 moles of gas to fill an average man's lungs.
ALLLEN
Answer:
0.124 moles
Explanation:
PV = nRT, can be used, where P is pressure, V is volume, n is the number of moles, R is the gas constant, and T is temperature in Kelvin.
Converting the volume to liters and temperature to Kelvin:
V = 45 L
T = 37°C + 273.15 = 310.15 K
Plugging these values into the ideal gas law:
1.00 atm * 45 L = n * 0.0821 Latm/mol/K * 310.15 K
Solving for n:
n = (1.00 atm * 45 L) / (0.0821 Latm/mol/K * 310.15 K) = 0.124 mol
So, it would take about 0.124 moles of gas to fill an average man's lungs.
a brass rod, a copper rod, an iron rod and a lead rod went into water with wax on top, which one rusted first if lead stayed on the longest and copper for the least
A brass rod, a copper rod, an iron rod and a lead rod went into water with wax on top, an iron rod will rust first if lead stayed on the longest and copper for the least.
What is rust?Rust is an iron oxide, which is a typically reddish-brown oxide created by the catalytic interaction of iron with oxygen in the absence of water or air moisture. Rust is often connected with the corrosion of refined iron and is composed of hydrous iron(III) oxides (Fe2O3nH2O) with iron(III) oxide-hydroxide (FeO(OH), Fe(OH)3).
Given enough time and the presence of oxygen and water, any iron mass may ultimately rust completely. A brass rod, a copper rod, an iron rod and a lead rod went into water with wax on top, an iron rod will rust first if lead stayed on the longest and copper for the least.
Therefore, an iron rod will rust first if lead stayed on the longest and copper for the least.
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The distance between the two hydrogen atoms in a molecule of water is 0.00000000172 m. Express this distance in scientific notation
A) 17.2 x10^9 m
B) 0.172 x 10^-10 m
C) 1.72 x 10^-10 m
D) 1.72 x10-9 m
E) 1.72 x 1010 m
The distance between the two hydrogen atoms in a molecule of water is 0.00000000172 m, 1.72x10⁻⁹ m is the distance in scientific notation.
Scientific notation is defined as a way of writing very large or very small numbers. A number is written in a very scientific notation when a number between 1 and 10 is multiplied by a power of 10. Let's consider for example, 650,000,000 can be written in scientific notation as 6.5 × 10⁸.
Distance is basically defined as the distance, or separation, between two objects. An example distance is 5 feet between two tables. Distance is a scalar quantity.
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The chemical formula for cesium chloride is Cs Cl.
A chemist measured the amount of cesium chloride produced during an experiment. She finds that 30.8 g of cesium chloride is produced. Calculate the number
of moles of cesium chloride produced.
Round your answer to 3 significant digits.
The number of moles of cesium chloride produced 0.183 moles.
How to calculate number of moles?The number of moles of a substance can be calculated by dividing the mass of the substance by its molar mass.
According to this question, the chemical formula for cesium chloride is CsCl. A chemist measured the amount of cesium chloride produced during an experiment. She finds that 30.8 g of cesium chloride is produced.
The molar mass of Cesium chloride is 168.36 g/mol
Moles = 30.8g ÷ 168.36g/lol
moles = 0.183 moles
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A student runs an experiment to figure out if the size of a wire changes how well it conducts electricity. She uses 5 different widths of copper wire and attaches each to a multimeter to measure
the resistance in the wires. The data collected is shown below.
Wire 1-12 Ohms
Wire 2-17 Ohms
Wire 3-9 Ohms
Wire 4-14 Ohms
Wire 5-6 Ohms
What is the independent variable in this experiment?
A. The multimeter.
B. The resistance values.
C. The material of the wires, copper.
D. The widths of the wires.
A student runs an experiment to figure out if the size of a wire changes how well it conducts electricity. The independent variable in this experiment is the multimeter. Therefore, option A is correct.
What is resistance ?The amount by which an object impedes or resists an electric current is referred to as resistance. The flow of electrons is referred to as electric current. Consider an example of a person struggling to move from one shop to another in a crowded market.
Because a thin wire has fewer electrons to carry the current, its resistance is greater than that of a thick wire. The relationship between resistance and the area of a wire's cross-section is inversely proportional.
Thus, The independent variable in this experiment is the multimeter,option A is correct.
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iupac name for this compound
The IUPAC name for the given compound is "heptanal oxime."
What is heptanal oxime?Heptanal oxime, also known as heptan-2-one oxime, is an organic compound with the chemical formula C7H15NO. It is an oxime derivative of the ketone heptan-2-one. Heptanal oxime is a colorless to pale yellow solid that is sparingly soluble in water, but soluble in many organic solvents.
Heptanal oxime is used as a chemical intermediate in the production of various compounds, such as agrochemicals, pharmaceuticals, and fragrances. It is also used as a chelating agent to form stable complexes with various metals, such as copper and iron.
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58.94 g of a substance of molecular mass 182 is dissolved in 1000 g of water at 20°C. At this temperature the vapour pressure of water is 17.5 mmHg. Calculate the vapour pressure of this dilute solution.
The vapor pressure of the dilute solution is 17.38 mmHg at 20°C.
What is the vapor pressure of solutions?Vapor pressure is the amount of pressure that the vapors apply to the liquid solvent when they are in equilibrium and at a particular temperature.
The environment's temperature and the type of liquid have an impact on vapor pressure.
To calculate the vapor pressure of the solution, we use the formula below:
Psolution = X * P°water
where;
Psolution is the vapor pressure of the solution,X is the mole fraction of water in the solution, andP°water is the vapor pressure of pure water.To calculate X, we need to know the number of moles of water and the number of moles of solute in the solution. We can assume that the volume of the solution is 1000 mL (or 1 L), since the density of water is close to 1 g/mL at room temperature.
Number of moles of water, n₁, in the solution:
n = mass / molar mass
n = 1000 g / 18.015 g/mol
n = 55.49 mol
Number of moles of solute, n₂ in the solution:
n = 58.94 g / 182 g/mol
n = 0.324 mol
Mole fraction of water in the solution:
X = n₁ / (n₁ + n₂)
X = 55.49 mol / (55.49 mol + 0.324 mol)
X = 0.994
Now we can calculate the vapor pressure of the solution:
Psolution = X * P°_water
Psolution = 0.994 * 17.5 mmHg
Psolution = 17.38 mmHg
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A 2.6−mL volume of seawater contains about 4.0 × 10−10 g of gold. The total volume of ocean water is about 1.5 × 1021 L. Calculate the total worth of all the gold in the world's oceans if the price of gold is $18.23 per gram.
The total volume of sea water is 1.5 × 10²¹ L. The amount of gold in the whole volume is 6 × 10¹¹ g of gold. Then, if one gram rate $18.23, the total worth of gold is $ 1.09×10¹³.
What is gold ?Gold is a metal widely used in ornaments and other plating as well. It is excavating from the places where its minerals or ore can be found in abundant and it worth higher prize.
Given that, 2.6 ml or 0.0026 L of ocean water contains 4 × 10⁻¹⁰ g of gold. Then, 1.5 × 10²¹ g contains,
1.5 × 10²¹ ×4 × 10⁻¹⁰ /0.0026= 6× 10¹¹ g of gold.
Price of one gram of gold = $18.23
then, price of the total amount 6× 10¹¹ g = 6× 10¹¹ g×$18.23 = $ 1.09×10¹³.
Therefore, the total price of gold in the world's ocean is $ 1.09×10¹³.
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PLEASE HELPPP AOSAPAOPSP
What are some of the difficulties in identifying particular drugs? Why is it important for forensic scientists to be able to identify particular drugs?
some medicines contain legal ingredients like starch and sugar, and forensic scientists must be able to distinguish between the two. Because courts rely on the data forensic scientists find in their research, it is crucial for them to be able to recognise specific substances.
How do you identify forensic drugs?The ideal technique for this evaluation is Gas Chromatography/Mass Spectrometry (GC/MS), which is frequently used in forensic laboratories. The method offers a quick, semi-automated analysis of the material and often produces enough data to pinpoint the problematic substances. To ascertain whether an unlawful substance is present in the supplied material is the aim of forensic drug chemistry. Law enforcement can seek criminal charges based on the study' findings, and the court can decide on the right sentence.
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The specific heat of water, 4.180 J·(g·K)−1, is greater than that of many other substances, such as aluminum, copper, and iron, which have specific heats of 0.902 J·(g·K)−1, 0.395 J·(g·K)−1, and 0.449 J·(g·K)−1, respectively. Which of the following statements about water can be attributed to this observation?
substances, such as aluminum, copper is measured in J/mole C rather than J/gC. 18.0 g/mole times 4.18 J/gC results in 75.2 J/moleC.
Is iron's specific heat higher than copper's specific heat?The key is to always keep in mind that the specific heat of copper is lower than that of iron. You need to keep in mind that the heat of metal is higher than the heat capacity of copper. As a result, we can state that Q is identical to Late Mr. Delta T.
Is water's specific heat 4.184?The temperature of the water equals 4.184 J/g-K due to the fact that there will be 4.184 megawatts in a calorie. Another way to define the ease that an item receives or loses heat.
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One atomic mass unit has a mass of 1.6605 × 10−24 g. What is the mass of one atom of sodium?
Answer:
one atom of sodium has a mass of approximately 37.9968 x 10^-24 grams.
Explanation:
The atomic mass of sodium is approximately 22.99 atomic mass units. To convert from atomic mass units to grams, we multiply by the conversion factor of 1.6605 x 10^-24 g/atomic mass unit:
mass (g) = 22.99 atomic mass units * (1.6605 x 10^-24 g/atomic mass unit) = 37.9968 x 10^-24 g
So one atom of sodium has a mass of approximately 37.9968 x 10^-24 grams.
A 0.5191-g sample of an unknown monoprotic acid is dissolved in water and titrated with standardized potassium hydroxide. The equivalence point in the titration is reached after the addition of 29.69 mL of 0.1453 M potassium hydroxide to the sample of the unknown acid. Calculate the molar mass of the acid.
? g/mol
The molar mass of the unknown acid is 120.4 g/mol.
How to calculate the number of moles in potassium hydroxide solution?
We can use the volume and concentration of the potassium hydroxide solution to determine the number of moles of KOH that were added to the acid sample:
moles of KOH = volume of KOH solution (L) x concentration of KOH solution (mol/L)
moles of KOH = 29.69 mL x (1 L / 1000 mL) x 0.1453 mol/L
moles of KOH = 0.004307 moles
Since the acid is monoprotic, the number of moles of KOH added is equal to the number of moles of acid present in the sample. We can use this information to calculate the molar mass of the acid:
moles of acid = moles of KOH = 0.004307 moles
molar mass of acid = mass of acid (g) / moles of acid
We know that the mass of the acid sample is 0.5191 g, so we can substitute this value into the equation:
molar mass of acid = 0.5191 g / 0.004307 mol
molar mass of acid = 120.4 g/mol
Therefore, the molar mass of the unknown acid is 120.4 g/mol.
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I did some of the boxes just need to figure out what the rest are. (LeChatelier’s Principle)
According to Lechatliers principle, as the concentration of HCl is decreasing, the reaction will shift to the reactant side to increase HCl, then the Keq decreases, since product concentration is decreases.
What is Lechatliers principle ?According to Lechatliers principle, when an any disorder imbalance the equilibrium of a reaction system, the system itself balances the factors and shifts to a new equilibrium.
If the concentration of any component is increased, then the reaction shifts to the direction in which it is consumed. If the concentration is decreased, the reaction shifts to the direction in which the component is produced.
Hence, as the HCl decreases, the reaction shifts to backwards direction to produce more HCl, then, concentration of reactants HCl and Mg increases, and that products and Keq decreases.
The reaction is an exothermic reaction. Hence, as the temperature is increased, the reaction shifts to the backward direction in which heat is used. Hence, reactant concentration increases, product concentration decreases, Keq also decreases.
If the temperature is reduced, the reaction shift to the forward direction. Hence, concentration of HCl, and Mg decreases but MgCl2 increases and Keq increases.
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2Hg + O2 ----> 2HgO
If you had 6 mol of oxygen and 12 mol of mercury, what would be the limiting reactant (if any)? Show your work.
According to the stoichiometry of the chemical reaction, the limiting reactant is oxygen which is important for reaction to proceed.
What is stoichiometry?Stoichiometry is the determination of proportions of elements or compounds in a chemical reaction. The related relations are based on law of conservation of mass and law of combining weights and volumes.
Stoichiometry is used in quantitative analysis for measuring concentrations of substances present in the sample.It is important while balancing chemical equations and chemical calculations used for making solutions or dilutions.
The limiting reagent is oxygen as it is present in less amount and will limit the formation of product that is mercuric oxide.Once it is used up, the reaction will not proceed.
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Which of the following conditions indicate an acidic solution at 25 °C? Select all that apply.
pOH = 9.66
pH = 4.25
[H+] > 1.0 x 10-7 M
[H+] > [OH-]
[OH-] > [H+]
[H+] > [OH-] of the following conditions indicate an acidic solution at 25 °C among the rest options.
Option C is correct.
What exactly is acidic solution?A solution with a pH of less than 7 is said to be acidic. A solution's acidity or basicity is measured on the pH scale, which ranges from 0 to 14. Solutions with a pH of 7 or higher are basic or alkaline, while solutions with a pH lower than 7 are acidic.
The presence of more hydrogen ions (H+) than hydroxide ions (OH-) in an acidic solution is a sign of its acidity. The degree to which an acid contributes hydrogen ions to a solution determines its strength. Acids are substances that do this.
Lemon juice, vinegar, and stomach acid are all common examples of solutions that are acidic. Acids can corrode metals and other materials and have a sour taste.
At 25°C, the following conditions indicate an acidic solution:
The condition pOH = 9.66 indicates a basic solution, and [OH-] > [H+] also indicates a basic solution.
pH = 4.25 [H+] > 1.0 x 10⁻⁷ M [H+] > [OH-]
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If Earth is 1.50 × 10^(8 km from the sun , what is the distance in Gm?
The distance of the Earth from the sun in gigameters is 1.50 × 10⁻⁴ Gm
How to convert km to Gm?A unit conversion is the expression of the same property in a different unit of measurement. To convert kilometers to gigameters, you need to divide the number of kilometers by 10¹². Here's the formula: Gigameters = Kilometers / 10¹²
To convert the distance from kilometers to gigameters (Gm), divide the number of kilometers by 10¹².
So, 1.50 × 10⁸ km ÷ 10¹² = 1.50 × 10⁻⁴ Gm
Therefore, the distance from the Earth to the Sun is approximately 1.50 × 10⁻⁴ Gm.
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Some confusion is introduced by the fact that physicists might focus on an individual molecule whereas a chemist might focus on a mole of them (1 mole = 6.023 x 10^{23} molecules or atoms).
If a particular molecule had a bond dissociation energy of 1 eV, how much energy would be needed (in kJ) to break all the bonds in one mole of molecules (not yet considering any interactions with the environment)?
To break all the bonds in one mole of molecules with a bond dissociation energy of 1 eV, we would require around 5.80 x [tex]10^{26}[/tex] kJ of energy.
The bond dissociation energy of 1 eV is roughly 96.485 kJ/mol. To break all the bonds in one mole of molecules (6.023 x [tex]10^{23}[/tex] molecules), we would need to multiply the bond dissociation energy by Avogadro's number:
96.485 kJ/mol x 6.023 x [tex]10^{23}[/tex] molecules/mol = 5.80 x [tex]10^{26}[/tex] kJ/mol
Bond dissociation energy is the amount of energy necessary to break a chemical connection between two atoms. It is also known as bond energy or bond enthalpy. This energy is measured in kilojoules per mole (kJ/mol) and is released when the bond forms. The energies of bond dissociation can vary greatly depending on the type of bond being broken.
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If 3.7 liters of CI2 are used for this reaction, how much HCI will be formed in liters?
Assume there are enough reactants to complete and STP
H2(g)+C12(g)-->2HCI (g)
The volume of HCl that will be formed from 3.7 liters of Cl2 would be 6.72 liters.
Moles of gas at STPAt STP, 22.4 liters of gas is equivalent to 1 mole of the gas.
3.7 liters of Cl2 = 3.7/22.4 = 0.17 mole
From the equation of the reaction, the mole ratio of Cl2 to HCl is 1:2. Thus, the equivalent mole of HCl that will be formed from 0.17 mole of Cl2 would be:
0.17 x 2 = 0.34 mole
0.34 mole of Cl2 = 22.4 x 0.3 = 6.72 liters
In other words, the volume of HCl that will be formed would be 6.72 liters.
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