The reactivity of alkaline metals generally increases as you move down the group in the periodic table. This means that the most reactive alkaline metals are located at the bottom of the group and the least reactive are located at the top.
The reason for this trend is due to the electronic configuration of the atoms of these elements. As you move down the group, the outermost electron becomes increasingly farther from the positively charged nucleus, and as a result, the electron is held less tightly to the atom. This makes it easier for the atom to lose this outermost electron, resulting in greater reactivity.
In addition, as you move down the group, the atomic radius of the alkaline metals increases. This increase in atomic size leads to a decrease in ionization energy, which is the energy required to remove an electron from an atom. This makes it easier for the atoms to lose electrons, increasing their reactivity.
Therefore, the trend in reactivity of alkaline metals from the top to the bottom of the periodic table is as follows: Lithium (Li) is the least reactive, followed by Sodium (Na), Potassium (K), Rubidium (Rb), and Cesium (Cs), which is the most reactive.
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potassium-40 decays to argon-40 with a half-life of 1.25 billion years. how much of a 24-gram sample of potassium-40 sample will remain after 3.75 billion years
We can use the radioactive decay formula to determine how much of the 24-gram sample of potassium-40 will remain after 3.75 billion years:
[tex]N = N0 * (1/2)^(t/T)[/tex]
where: N0 is the initial amount of the radioactive substance
N is the final amount of the radioactive substance
t is the time that has passed
T is the half-life of the radioactive substance
Plugging in the given values, we get:
[tex]N = 24 g * (1/2)^(3.75)[/tex])billion years / 1.25 billion years)
[tex]N = 24 g * (1/2)^3[/tex]
[tex]N = 24 g * 0.125[/tex]
[tex]N = 3 g[/tex]
Therefore, after 3.75 billion years, only 3 grams of the 24-gram sample of potassium-40 will remain.
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Please help need this immediately
What is the concentration of F2 (g), in parts per billion, in a solution that contains 4.8 * 10 ^ - 8 * g of F2 (g) dissolved in 9.6 * 10 ^ - 3 * g of H2O(l)?
A 50 ppb
B 5.0 x 10^2 ppb
C 5 ppb
D 5.0 x 10^3 ppb
Answer:
It's option D
Explanation:
a mixture of helium and argon gas is expanded from a volume of to a volume of , while the pressure is held constant at . calculate the work done on the gas mixture. round your answer to significant digits, and be sure it has the correct sign (positive or negative).
When a mixture of helium and argon gas is expanded from a volume of to a volume of , while the pressure is held constant then work done on the gas will be W = -2.70 L atm .
To calculate the work done on the gas mixture, we can use the formula:
W = PΔV
where W is the work done, P is the constant pressure, and ΔV is the change in volume.
Assuming the initial volume of the gas mixture is V1 and the final volume is V2, and using the values given in the problem, we have:
ΔV = V2 - V1 = 9.50 L - 6.80 L = 2.70 L
Substituting this value along with the constant pressure of P = 1.00 atm, we get:
W = PΔV = (1.00 atm)(2.70 L) = 2.70 L atm
We should also consider the sign of the work done. Since the gas is expanding, the work done by the gas is negative (i.e., the system is doing work on the surroundings). Therefore, we need to assign a negative sign to the result:
W = -2.70 L atm (to two significant digits).
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The following orbital notation is for which element?
The following orbital notation is for the element O (Oxygen).
What is an orbital notation?Orbital notation is a way to describe the electron configuration of an atom. It consists of a combination of symbols and numbers that represent the energy level, type of orbital, and the number of electrons contained in that orbital.
The notation uses the letter symbols "s," "p," "d," and "f" to represent the different types of orbitals, and a superscript to indicate the number of electrons in the orbital. For example, the orbital notation for a carbon atom is "1s2 2s2 2p2," indicating that there are two electrons in the 1s orbital, two electrons in the 2s orbital, and two electrons in the 2p orbital.
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-Complete Solution.
+Brainliest With Correct Answer/Solution And Complete Solution.
A car starts from rest and moves at the speed of 30km/h after half an hour. What is the car's acceleration?
The acceleration of the car, given that it started from rest and move with a speed of 30 Km/h in half hour is 60 Km/h²
How do I determine the acceleration of the car?Acceleration is defined as follow:
a = (v – u) / t
a is the acceleration v is the final velocity u is the initial velocity t is the timeThe following data were obtained from the question:
Initial velocity (u) = 0 Km/h Final velocity (v) = 30 mi/hrTime (t) = 1/2 hour = 0.5 hourAcceleration of car (a) =?The acceleration of the car can be obtained as follow:
a = (v – u) / t
a = (30 - 0) / 0.5
a = 30 / 0.5
a = 60 Km/h²
Thus, we can conclude from the above calculatuin that the acceleration of the car is 60 Km/h²
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what is the relationship between the temperature speed and kinetic energy of gas molecules?
There is a direct relationship between temperature, speed, and kinetic energy of gas molecules is as the temperature increases, so does the average speed and kinetic energy of the gas molecules.
The temperature, speed, and kinetic energy of gas molecules are related to each other through the gas laws and the concept of ideal gases. According to the ideal gas law, the pressure, volume, and temperature of a gas are proportional to each other, and are directly proportional to the average kinetic energy of the gas molecules. This means that as the temperature of a gas increases, the average kinetic energy of its molecules also increases.
The relationship between temperature, speed, and kinetic energy can also be understood through the concept of random motion. Gas molecules are in constant random motion, bouncing off of each other and the walls of their container. The average kinetic energy of these molecules is directly proportional to the temperature of the gas. As the temperature of the gas increases, the average speed of its molecules also increases, and thus, so does their kinetic energy.
In mathematical terms, the average kinetic energy of a gas molecule can be represented as:
KE = (3/2)kT
where KE is the average kinetic energy, k is the Boltzmann constant, and T is the temperature in Kelvin.
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what will happen when 100 ml of diethyl ether is added to 100 ml of water and thoroughly mixed? the temperature of the mixture will significantly increase. diethyl ether will form a separate layer on top of the water layer. water will form a separate layer on top of the diethyl ether layer. diethyl ether will fully dissolve in water. there will be a chemical reaction between diethyl ether and water.
Option (b) is correct. When 100ml of diethyl ether is added to 100ml of water and thoroughly mixed, the diethyl ether will form a separate layer on the top of the water layer due to Van der Waals forces.
When we mix diethyl ether and water, they do not mix. They would quickly separate out with the ether layer on top as it is less dense. This process is frequently used to separate the products of organic synthesis.- The product is more soluble in diethyl ether than water that is shaken with diethyl ether multiple times and the ether layers collected usually for further purification. Diethyl ether does not form hydrogen bonds and only has Van Der Waals forces between the molecules This will be referred to as Dipole-Dipole. Water cannot hydrogen bond to the diethyl ether molecules and has very weak van der waals forces and dipole-dipole forces it is bonded more strongly to itself than the diethyl ether. Diethyl ether molecules are bonded more strongly to each other. so they separate out into two layers.
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The complete question is ,
what will happen when 100 ml of diethyl ether is added to 100 ml of water and thoroughly mixed?
(a) the temperature of the mixture will significantly increase.
(b) diethyl ether will form a separate layer on top of the water layer.
(c) water will form a separate layer on top of the diethyl ether layer.
(d) diethyl ether will fully dissolve in water.
(e) there will be a chemical reaction between diethyl ether and water.
Transcribed Image Text:According to Beer-Lambert law, the absorbance of dye such as crystal violet is proportional to its Select one: temperature concentration transmittance Van't Hoff Factor
According to Beer-Lambert law, the absorbance of dye such as crystal violet is proportional to its molar concentration.
Beer-Lambert law says that, "there is a linear relationship between the absorbance of the solution and the concentration, which enables the concentration of a solution to be calculated by measuring its absorbance.
Beer Lambert law is basically used in chemistry to measure the concentration of chemical solutions, analyze oxidation, and measure polymer degradation. This law also explains the attenuation of radiation through the Earth's atmosphere.
The Beer-Lambert law is mathematically expressed as:
A = εLc
where,
A is the denotation for absorbance, ε is the molar extinction coefficient, l is the length of the path light which must travel in the solution in centimeters, and c is the concentration of a given solution.
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Of the following, which gives the correct order for atomic radius for mg, na, p, si and ar?
a. Mg > Na > P > Si > Ar
b. Ar > Si > P > Na > Mg
c. Na > Mg > Si > P > Ar
d. Si > P > Ar > Na > Mg
e. Ar > P > Si > Mg > Na
The correct order for atomic radius is:
d. Si > P > Ar > Na > Mg
The size of an atom increases as you go down a column in the periodic table, because each electron is added to a higher energy level farther away from the nucleus. The size of an atom decreases as you go across a row in the periodic table, because the effective nuclear charge increases, pulling the electrons closer to the nucleus.
To prevent time-temperature abuse when transporting food, which practice should be followed?
A. Stack all hot potentially hazardous (TCS) food items together in a sturdy cardboard box.
B. Load the delivery truck with potentially hazardous (TCS) cold items first and hot items last.
C. Transport cold potentially hazardous (TCS) food in an ice chest that maintains a temperature of 45 F.
D. Transport potentially hazardous (TCS) hot food in an insulated food container at 135 F or higher
To prevent the time temperature when transporting the food, the practice should be followed is the correct option is D. Transport potentially haza-r-dous ( TCS) hot food in an ins-ul-ated food container at the 135 or the higher.
The average body of the temperature is 98.6 that is 37 °C. The average body temperature, is will be as the high as 99 that is 37.2 °C or will be low as the 97 that is 36.1 °C. The temperature may be varies that is based on the time of the day .
Thus, Transport cold potentially haza-r-dous (TCS) that is hot food in the ins-ul-ated food container at the 135 or the higher.
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sodium (na) starts with 11 protons and 11 electrons. when sodium donates an electron, group of answer choices the valence shell (second shell) becomes complete. sodium will be attracted to positively charged ions. the sodium ion becomes negatively charge. sodium will be able to form nonpolar covalent bonds.
With 11 protons and 11 electrons, sodium (Na) is created. The valence shell, or second shell, of sodium is finished when an electron is donated. Hence, option 1 is correct answer.
The distribution of electrons among the many possible orbitals on an element's atom is known as its "electron configuration." The designations of the orbitals s, p, d, and f refer to groups of lines that were first detected in the spectra of the alkali metals. The sharp, primary, diffuse, and fundamental line groupings are among them.
The s-orbital, p-orbital, d-orbital, and f-orbital are among them. the first shell is known as the K shell because: Spectroscopist Charles G. Barkla gave the electron shells their names. As he observed that the X-rays produce two different sorts of energy, he gave the innermost shell the name K shell. He gave type A, higher energy, and type B, lower energy X-ray as additional names for those two energies.
The electron configuration of Sodium is
Na₁₁ = 1s² 2s² 2p⁶ 3s¹
When the sodium ion denotes 1 electron to another atom, then the electron configuration becomes,
Na⁺ = 1s² 2s² 2p⁶
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a piece of silver of mass 362 g has a heat capacity at constant pressure of 85.7 j / 0c. what is the molar heat capacity at constant pressure of silver?
Silver has a 0.235 J/g°C specific heat.
The amount of energy needed to raise the temperature of a given mass of a substance by a certain quantity is measured by the substance's specific heat. In this issue, we are required to determine a piece of silver's specific heat given its mass and heat capacity.
According to the equation
specific heat = heat capacity/mass
specific heat = 85.7 J/°C / 362 g
Thus, 0.235 joules of energy are required to raise the temperature of 1 gm of silver by 1 degree Celsius. The thermal characteristics and behavior of a substance are significantly influenced by its specific heat.
Complete question:
A piece of silver of mass 362 g has a heat capacity of 85.7 J/°C. What is the specific heat of silver?
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what causes the litmus to change from purple to pink?
Litmus is a type of dye that is extracted from lichens and is commonly used as a pH indicator. The color change from purple to pink indicates a change in the acidity or basicity of a solution.
In an acidic solution, the hydrogen ion (H+) concentration is high, which causes the litmus dye to change from its original blue color to red. In a neutral or basic solution, the hydrogen ion concentration is low, and the litmus dye remains blue. However, if the solution is sufficiently basic, the litmus dye will change from blue to pink. The exact mechanism of this color change is due to the chemical structure of the litmus dye, which contains a variety of functional groups that can interact with hydroxide ions (OH-) in a basic solution. This interaction causes a change in the electronic structure of the dye molecules, which results in a change in their absorption and transmission of light and, therefore, a change in color.
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SEP Develop a Model Mountain climbers need really warm clothing because it
gets colder at higher altitudes. Sketch molecular models for equal-mass samples of
air at different altitudes. Use your models to show why there might be less energy
in the samples at higher altitudes.
Answer:
At lower altitudes, the air molecules are closer together and have more energy due to their increased interactions with each other. At higher altitudes, the air molecules are more spread out and have less energy due to their decreased interactions with each other. This can be represented by sketching molecular models of air at different altitudes.
At lower altitudes, the molecules are represented by a dense, tightly packed arrangement. At higher altitudes, the molecules are represented by a more spread out, less dense arrangement. This difference in density and energy can be seen in the models, and it explains why there is less energy in the samples at higher altitudes.
QuestionWhat will be the molarity of a solution, which contains 5.85 g of NaCl(s) per 500 mL?A4 molL −1 B20 molL −1 C0.2 molL −1 D2 molL −1 Medium
We require the number of moles of solute and the volume of the solution in liters to determine the molarity of a solution. Initially, we must calculate the amount of moles of NaCl in 5.85 g. NaCl .
has a molar mass of 58.44 g/mol: NaCl moles = mass of NaCl / molar mass of NaCl moles = 5.85 g / 58.44 g/mol NaCl moles = 0.1 mol The volume of the solution must then be converted from milliliters to liters: 500 mL / 1000 mL/L solution volume 0.5 L solution volume We can compute the molarity of the solution now that we know the number of moles of NaCl and the volume of the solution in liters: molarity = solute moles / volume of solutio molarity = 0.1 mol / 0.5 L molarity = 0.2 mol/L Therefore, the molarity of the solution is 0.2 mol/L, which corresponds to option C.
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A 145 mL flask contains argon at 1.3 atm and 65 ◦C. What amount of Ar is present? Answer in units of mol.
A 145 mL flask contains argon at 1.3 atm and 65 ◦C. 6.12g is the amount of Ar is present. 0.34mol is the amount of Ar is present.
What is argon?Argon is indeed a chemical element with the atomic number 18 and the symbol Ar. It is considered a noble gas and belongs to Periodic Group 18. [6] Argon, with 0.934%, is the third-most prevalent gas in the Earth's atmosphere (9340 ppm).
It is more than twice as plentiful than water vapor (which averages around 4000 ppm but fluctuates widely), 23 times as prevalent than carbon dioxide (400 ppm), as well as 500 times more abundant than neon (18 ppm).
P×V = n×R×T
1.3 ×145 = n×8.314× 65
n = 188.5 / 540.4 =0.34mol
mass = 0.34 ×18=6.12g
Therefore, 6.12g is the amount of Ar is present.
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CH₂O
Empirical
Formula Mass
Answer: 32 atomic mass units
Explanation:
carbon is 14
hydrogen is 1 each
oxygen is 16
Exercise 6.76- Enhanced - with Feedback
MISSED THIS? Read Section 6.6. You can click on the
Review link to access the section in your eText.
Silver chloride, often used in silver plating, contains 75.27%
Ag.
Part A
Calculate the mass of silver chloride in grams required to make 4.4 g of silver plating
Express your answer using two significant figures.
196) ΑΣΦ
magci =
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g
Silver chloride, often used in silver plating, contains 75.27% Ag. 450mg is the mass of silver chloride in grams required to make 4.4 g of silver plating.
What is silver plating?Silver is stable in clean air and clean water, but tarnishes whenever subjected to ozone, hydrogen sulfide, especially sulfurous air. Silver is largely utilized in electroplating for industrial purposes, notably electrical connections.
1 mole of AgCl, 0.7527 mol of Ag present.
1 mol of Ag is obtained from 1/0.75mol of AgCl
number of moles = 4.4 g / 107.87=0.002mol
0.002364 mol of Ag will be obtained from 0.002mol/ 0.7527 =0.003 mol
mass = moles × molar mass
= 0.03 × 143.3=0.450g=450mg
Therefore, 450mg is the mass of silver chloride in grams required to make 4.4 g of silver plating.
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Why does 1M NaCl have a higher boiling point than water?
There are fewer water molecules withinside the vapor (i.e., decrease vapor stress) above the NaCl solution than withinside the vapor above natural water.
The boiling factor of the NaCl answer can be extra than the boiling factor of natural water. The boom withinside the boiling factor of a 1.00 m aqueous NaCl answer can be about two times as massive as that of the glucose or sucrose answer due to the fact 1 mol of NaCl produces 2 mol of dissolved ions. Hence a 1.00 m NaCl answer could have a boiling factor of approximately 101.02°C.The addition of any non-unstable solute (including salt, baking soda or sugar) to a liquid will reason a lower in that drinks vapor stress. A liquid will begin to boil while its vapor stress is identical to the atmospheric stress, so a decrease vapor stress method you want a better temperature to boil the water.
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they also have different ____________ , or the amount of energy needed to increase the temperature of the object.
Oxygen and carbon, as well as other elements, have different specific heat capacities. Specific heat capacity, also known as specific heat, is the amount of energy required to increase the temperature of a substance by a certain amount.
The specific heat of a substance depends on its physical and chemical properties, such as its atomic structure, mass, and intermolecular forces. Different elements have different properties, which lead to differences in their specific heats.
For example, water has a high specific heat capacity compared to many other substances, which is why it is often used to regulate temperature in industrial processes and in nature. This means that it takes a relatively large amount of energy to increase the temperature of water by a given amount. In contrast, metals like copper have low specific heat capacities, which means that it takes much less energy to increase their temperature by the same amount.
In terms of the human body, the specific heat capacity of different tissues and organs is important for regulating body temperature. For example, the brain and the liver have high specific heat capacities, which helps to protect them from rapid temperature changes. In contrast, bone has a lower specific heat capacity, which makes it more susceptible to temperature changes.
Overall, the specific heat capacity of different elements and substances is an important physical property that has a significant impact on the behavior of matter. It is a fundamental property of materials that is essential for understanding and predicting the behavior of systems in the physical and natural sciences, including the human body.
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Select the term that correctly describes a chemical reaction that favors one possible structural isomer over one or more other structural isomers. a. regioselective b. stereoselective c. regiogenic d. stereogenic
While structural isomers share the same molecular formula, their atoms are bonded differently. Stereoisomers share the same atomic configurations and chemical formulae. Thus, option A is correct.
What favours one possible structural isomer?The term "structural isomer," also known as a "constitutional isomer," refers to a group of two or more organic compounds that share the same chemical formula but have different structures.
Isomers are compounds that share the same molecular formula but differ in the way their atoms or groupings are arranged or oriented. Only the groups' spatial orientation within the molecule distinguishes them from one another.
The location of the methyl group varies between the two molecules below, despite having the same chemical formula.
Therefore, regioselective is the term that correctly describes a chemical reaction that favours one possible structural isomer over one or more other structural isomers.
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what part of pyridinium chlorochromate (pcc) allows it to dissolve in organic solvent so it can be used in reactions in the absence of water?
The pyridinium cation in pyridinium chlorochromate (PCC) allows it to dissolve in organic solvents so it can be used in reactions in the absence of water.
Pyridinium chlorochromate (PCC) is a red-orange glasslike strong that is dissolvable in different organic solvents, like dichloromethane (CH2Cl2), chloroform (CHCl3), and CH3)2CO. The piece of PCC that permits it to break down in these organic solvents is the pyridinium cation (C5H5NH+).
The pyridinium cation is a positively charged particle that is shaped by the protonation of pyridine, a six-membered fragrant heterocyclic compound. The positive charge on the pyridinium cation makes it drawn to the negative charge on the chloride particle (Cl-), which is likewise present in PCC. The association between the decidedly charged pyridinium cation and the adversely charged chloride particle frames an ionic bond, which permits PCC to break up in natural solvents.
The dissolvability of PCC in organic solvents makes it helpful in numerous organic reactions where the presence of water should stay away. For example, PCC can be used as a mild oxidizing agent in the absence of water to convert primary alcohols to aldehydes and secondary alcohols to ketones.
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are enzymes consumed in chemical reactions and cannot be used again.?
One of the key features of enzymes is that they are not consumed in chemical reactions and can be used again.
Enzymes are biological catalysts that accelerate chemical reactions by lowering the activation energy required for the reaction to occur. They are typically large, complex proteins that have a specific three-dimensional structure that allows them to interact with specific substrates, or reactants, in a particular chemical reaction.
Enzymes remain unchanged after a reaction, and can be used to catalyze the same reaction many times over. However, enzymes can be affected by changes in pH, temperature, or other environmental factors, which can alter their structure and affect their ability to catalyze reactions.
Enzymes are critical to many biological processes, including metabolism, digestion, and DNA replication. Without enzymes, many of these processes would occur too slowly to sustain life. Scientists have also developed ways to use enzymes in industrial processes, such as the production of biofuels and pharmaceuticals. The ability to use enzymes repeatedly in these applications makes them a valuable tool in the development of sustainable and efficient technologies.
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13. what reactant combines with oxygen to form sulfur dioxide? where can this reactant be found in nature?
Sulfur dioxide (SO2) is typically formed by the combustion or oxidation of sulfur-containing materials. In the context of industrial processes, sulfur dioxide is commonly produced by burning sulfur-rich fuels such as coal and oil.
In nature, sulfur dioxide can also be formed by volcanic activity, as well as through the bacterial and chemical breakdown of organic matter that contains sulfur.Sulfur dioxide can be produced by the reaction of sulfur or sulfur-containing compounds with oxygen. For example, when sulfur is burned in the presence of oxygen, sulfur dioxide is formed according to the following reaction:
S (s) + O2 (g) → SO2 (g)
The reaction can also occur between sulfur compounds, such as hydrogen sulfide (H2S), and oxygen:
2 H2S (g) + 3 O2 (g) → 2 SO2 (g) + 2 H2O (g)
Sulfur dioxide is an important gas in the atmosphere, as it plays a role in regulating climate and air quality. However, high concentrations of sulfur dioxide can be harmful to human health and the environment, and so it is important to control and monitor its release into the environment.
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The volume occupied by 9.03×10^23 molecules of N2 gas at STP is closest to??A) 1.50 LB) .500 LC) 22.4 LD) 33.6 L
The volume of the N₂ gas at STP is 33,6 liter. 9,03 × 10²³ molecules of N2 gas equal 1,5 mol N₂.
Volume at STP or the molar volume for every gas at standard temperature and pressure is 22,4 liter/mol. To find out the volume of the N₂ gas at STP you can use the following steps:
Step 1: The first step you have to do is calculate the number of moles of the compound.
mol = number of particles ÷ Avogadro's number
= 9,03 × 10²² ÷ 6,02 × 10²³
= 9,03 ÷ 6,02
= 1,5 mol
Step 2: The next step is to calculate the volume of N₂ in the STP state
Volume N₂ = n × volume at STP
= 1,5 mol × 22,4 liter/mol
= 33,6 liter
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Which one of the following can be classified as a nonelectrolyte?A) LiIO3B) Cl2C) NaID) KIOE) HI
The one of the following that can be classified as a nonelectrolyte is HI. Nonelectrolytes are molecules that do not dissociate in water and do not conduct electricity, which means that they do not contain ions.
HI is a molecular compound composed of hydrogen and iodine, so it does not dissociate in water and does not conduct electricity, making it a nonelectrolyte. A nonelectrolyte is a substance that does not dissociate into its component ions when dissolved in a solvent such as water. This means that it does not conduct electricity and does not form a solution in which the ions can move freely. Nonelectrolytes are usually molecular substances, such as sugar, alcohol, and hydrocarbons, that contain only non-polar covalent bonds. When these substances are dissolved in water, they remain as intact molecules and do not break down into ions.
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a 50.00 ml sample is titrated with 18.10 ml of a 0.0148 m hcl solution to the phenolphthalein endpoint. what is the p alkalinity of the sample in ppm of caco3?
The p-alkalinity of the CaCO3 sample in ppm is 12.57.
In order to solve this problem, we need to use the balanced chemical equation for the reaction between the HCl and the alkalinity in the sample:
OH- + HCl -> H2O + Cl-
From the equation, we can see that each mole of HCl reacts with one mole of OH-. Therefore, the number of moles of OH- in the sample is equal to the number of moles of HCl that were added during the titration.
We can use this information to calculate the p-alkalinity of the sample as follows:
Calculate the number of moles of HCl that were added during the titration:
moles HCl = concentration of HCl x volume of HCl
= 0.0148 mol/L x 0.01810 L
= 0.00026788 mol
Since the reaction is 1:1 between OH- and HCl, the number of moles of OH- in the sample is equal to the number of moles of HCl that were added during the titration:
moles OH- = 0.00026788 mol
Convert the number of moles of OH- to ppm of CaCO3:
ppm CaCO3 = (moles OH-) x (1000000 ppm / 1 mol OH-) x (100 g CaCO3 / 2 mol OH-) x (1 L / 50.00 mL)
ppm CaCO3 = 267.88 ppm
Calculate the p-alkalinity:
p-alkalinity = 14 - log(ppm CaCO3)
= 14 - log(267.88)
= 12.57
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suppose you separate a 2.18 g mixture of sand and salt and recover 1.61 g of salt. what is the percent by mass of salt in the mixture?
In reference to the given data concerning the separation of the mixture, the percent by mass of salt in the mixture is 73.9%.
Finding the percent by mass of salt in the mixtureTo find the percent by mass of salt in the mixture, we need to divide the mass of salt by the total mass of the mixture and multiply by 100.
First, we need to calculate the mass of sand in the mixture:
Mass of sand = Total mass of mixture - Mass of salt
Mass of sand = 2.18 g - 1.61 g = 0.57 g
Now we can calculate the percent by mass of salt in the mixture:
Percent by mass of salt = (Mass of salt / Total mass of mixture) x 100%
Percent by mass of salt = (1.61 g / 2.18 g) x 100%
The percent by mass of salt = 73.9%
Therefore, the percent by mass of salt in the mixture is 73.9%.
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3. Read the entire laboratory activity. Form a hypothesis
about what observable products will indicate that a
double-replacement reaction has gone to completion.
Record your hypothesis in the next column.
A possible hypothesis on the observable products indicating that the reaction has gone to completion could be:
In a double-replacement reaction, two ionic compounds will exchange their positive and negative ions to form new ionic compounds. The reaction can be considered complete when the formation of a solid precipitate, gas evolution, or a change in temperature or color is observed.What is a double-replacement reaction?A double-replacement reaction is a type of chemical reaction that occurs between two ionic compounds in which the cations and anions of the two compounds switch partners to form two new ionic compounds.
In other words, the cations of one compound exchange places with the anions of the other compound. The general form of a double-replacement reaction can be written as AB + CD -> AD + CB, where A and B are the cations of the two original compounds and C and D are the anions of the two original compounds.
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if 0.25 mol of br2 and 0.25 mol of cl2 are introduced into a 3.0 l container at 400 k, what is the equilibrium concentration (in m) of brcl?
Introducing 0.25 mol of br2 and 0.25 mol of cl2 into a 3.0 l container at 400 k results in the 0.096 M of equilibrium concentration of BrCl
The reaction for the formation of BrCl from Br2 and Cl2 is:
Br2(g) + Cl2(g) ⇌ 2BrCl(g)
The equilibrium constant expression for the above reaction is:
Kc = ([[tex]BrCl^{2}[/tex]]) / ([Br2][Cl2])
where [BrCl], [Br2], and [Cl2] are the equilibrium concentrations of the respective species in the reaction.
Since we have 0.25 mol of both Br2 and Cl2 in a 3.0 L container, the initial concentration of each is:
[Br2] = 0.25 mol / 3.0 L = 0.083 M
[Cl2] = 0.25 mol / 3.0 L = 0.083 M
At equilibrium, let's assume that the concentration of BrCl is x M. Therefore, the equilibrium concentration of Br2 and Cl2 will be (0.083 - x) M, since each mole of Br2 and Cl2 produces 2 moles of BrCl.
Kc = ([[tex]BrCl^{2}[/tex]]) / ([Br2][Cl2])
At equilibrium, Kc will have a certain value at the given temperature. For this problem, let's assume Kc =2.0 x [tex]10^{-2}[/tex] (which is an estimated value based on literature values at 400 K). Solving for x, we get:
2.0 x [tex]10^{-2}[/tex] = [tex]x^{2}[/tex] / [[tex](0.083 - x)^{2}[/tex]]
x = 0.096 M
Therefore, the equilibrium concentration of BrCl is 0.096 M.
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