Answer:
Wax
Explanation:
Hydrophobic materials don't desolve in water, wax is a waterproof material and won't desolve causing it to be a hydrophobic material.
Wax is a hydrophobic material as it doesn't dissolve in water. Literally, "the fear of water" is "hydrophobic." Water is repelled by hydrophobic molecules and surfaces.
Oil and other hydrophobic liquids will separate from water. The atoms that make up hydrophobic compounds are often nonpolar, which means they don't generate a static electric field. These opposing areas of electrical energy attract water molecules in polar molecules. Water cannot form hydrogen bonds with molecules unless the molecules have opposing electrical charges. The nonpolar molecules congregate as a result of the water molecules forming more hydrogen bonds with one another. The clustering of nonpolar molecules produces the hydrophobic effect. Large macromolecules may have hydrophobic regions that cause the molecules to fold together and move away from water.
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the solubility of o2 in water is 5.85 x 10-4 m at 25 oc and 0.45 atm of o2 pressure . what will the solubility be when the partial pressure of o2 is one-fourth of the original pressure? group of answer choices 0.0023 m 0.0052 m 0.0013 m 0.00026 m 0.00015 m
The solubility of gas (O2) in water will be 1.49 x 10^-4 M when the partial pressure of O2 is one-fourth of the original pressure i.e. option E : 0.00015 M
The solubility of a gas in water is directly proportional to the partial pressure of the gas above the solution. This relationship is described by Henry's law, which states that the solubility of a gas in a solvent is proportional to the pressure of the gas above the solvent.
Therefore, if the partial pressure of O2 is one-fourth of the original pressure, the solubility of gas (O2) in water will be proportional to the new pressure, which is 0.45 atm / 4 = 0.1125 atm.
So, the new solubility of gas (O2) in water will be:
New solubility = original solubility * (new pressure / original pressure)
New solubility = 5.85 x 10^-4 M * (0.1125 atm / 0.45 atm)
New solubility = 1.49 x 10^-4 M
Therefore, the solubility of gas (O2) in water will be 1.49 x 10^-4 M when the partial pressure of O2 is one-fourth of the original pressure.
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What is the minimum number of grams of CO require
produce 88 grams of CO2?
A) 28 g
B) 88 g
C) 64 g
D) 56 g
Answer:
The minimum number of grams of CO require
produce 88 grams of CO2 is 64 g.
the gas in a 275.0 ml piston experiences a change in pressure from 1.45 atm to 2.90 atm. what is the new volume (in ml) assuming the moles of gas and temperature are held constant?
The new volume is 559.7 ml, assuming the moles of gas and temperature are held constant.
The new volume (V2) of the gas in the piston can be determined using 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.
Given the initial pressure (P1) and volume (V1), as well as the new pressure (P2), we can solve for the new volume (V2). We can rearrange the equation to get V2 = (P2V1)/P1.
Plugging in our values gives us
V2 = (2.90 atm)(275.0 ml)/(1.45 atm) = 559.7 ml. So, the new volume of the gas in the piston is 559.7 ml.
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Using your periodic table and calculator as needed, answer the following question.
Of the following 2 compounds, which compound has a greater percent by mass of
chromium?
a) K₂CrO4
b) K₂Cr₂O7
The compound with the greatest percentage by mass of chromium is K₂Cr₂O₇ (Option B)
How do I know which compound have the greatest percentage of chromium?To know the compound with the greatest precentage of chromium, we shall determine the percentage of chromium in both compounds. Details below:
For K₂CrO₄
Molar mass of K₂CrO₄ = (39 × 2) + 52 + (16 × 4) = 78 + 52 + 64 = 194 g/moleMass of Cr in K₂CrO₄ = Cr = 52 gPercentage of Cr =?Percentage of Cr = (mass of Cr / mass of K₂CrO₄) × 100
Percentage of Cr = (52 / 194) × 100
Percentage of Cr = 26.8%
For K₂Cr₂O₇
Molar mass of K₂Cr₂O₇ = (39 × 2) + (52 × 2) + (16 × 4) = 78 + 104 + 64 = 246 g/moleMass of Cr in K₂Cr₂O₇ = 2Cr = 2 × 52 = 104 gPercentage of Cr =?Percentage of Cr = (mass of Cr / mass of K₂Cr₂O₇) × 100
Percentage of Cr = (104 / 246) × 100
Percentage of Cr = 42.3%
From above calculations, we obtained:
Percentage of Cr in K₂CrO₄ = 26.8%Percentage of Cr in K₂Cr₂O₇ = 42.3%Thus, we can conclude that the compound with the greatest percentage is K₂Cr₂O₇ (Option B)
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What functional groups are present on this molecule? Check all that apply. - carboxyl - hydroxyl - amino.
The functional groups that are in the molecule would be carboxyl - hydroxyl - amino.
What are the functional groups of a molecule?Functional groups are specific groups of atoms within a molecule that determine its chemical properties and reactivity. They are responsible for the unique chemical behavior of different molecules and play a crucial role in chemical reactions. Some common functional groups include:
Alcohols (OH)
Aldehydes (CHO)
Ketones (CO)
Carboxylic acids (COOH)
Esters (COOR)
Amides (CONH2)
Amines (NH2)
Phosphates (PO4)
Each functional group has a specific arrangement of atoms and a characteristic chemical reactivity, which allows it to participate in specific chemical reactions and impart specific properties to the molecule. Understanding functional groups is important for predicting the behavior of molecules in chemical reactions and for synthesizing new molecules with desired properties.
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what intermolecular forces are present in carbon tetrafluoride, cf4?
The intermolecular forces are present in the carbon tetrafluoride, CF₄ is the london dispersion forces.
The carbon tetrafluoride is the nonpolar molecule and the nonpolar molecule exerts the London dispersion force is the only intermolecular force. Therefore the only London dispersion force will be present in the carbon tetrafluoride compound. The london dispersion force is the force that occur between the atom or the molecules that are electrically symmetric. The dipole - induced dipole attraction is called as the london dispersion force. The london dispersion force is weaker than the hydrogen bonding.
Thus, the london dispersion force is present in the carbon tetrafluoride , CF₄.
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What is the formula mass of CuSO4?
Copper Sulfate (CuSO4) has a formula mass of 159.60 g/mol.
What is Copper Sulfate?A fungicide, herbicide, and algaecide, copper sulphate is a blue crystalline substance. CuSO4 is its chemical name, and it is made up of copper, sulphur, and oxygen.
Additionally, copper sulphate is utilised for metal recovery, colouring, and electroplating. It can be hazardous to both people and animals in excessive amounts.
How can you determine it?It is determined by multiplying the atomic masses of all the formula's constituent elements. CuSO4, or one atom of copper (Cu), one atom of sulphur (S), and four atoms of oxygen, is the formula for copper sulphate (O). Copper has an atomic mass of 63.55 g/mol, sulphur has a mass of 32.06 g/mol, and oxygen has a mass of 16.00 g/mol. Thus, the mass of CuSO4 can be determined using the following formula:
159.60 g/mol is equal to 63.55 g/mol of copper, 32.06 g/mol of sulphur, 4 times 16.00 g/mol of oxygen, and 32.06 g/mol of sulphur.
Thus, 159.60 g/mol is the formula mass for copper sulphate.
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how much heat is released if a 10.0 gram piece of aluminum is cooled from 70°c to 50°c?
As a result, the aluminum emits -180 J of heat when it is reduced from 70 to 50 degrees Celsius.
Why does science increase the temperature?The mobility of atoms and molecules is accelerated when energy is added (heating), increasing the temperature. By withdrawing energy (cooling), atoms and molecules slow down and the temp drops as a result. Conduction is a technique that allows energy to be added to or taken away from a medium.
The following formula is used to calculate how much heat is emitted when aluminum is reduced from 70°C to 50°C:
Q = mcΔθ
where;
m is the aluminum's mass.
Specific heat capacity is c.
Δθ is a temperature change.
Q = (10)(0.9)(50 - 70) (50 - 70)
Q = -180 J
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What is the density of NH3 at 800 torr and 25 degrees C?
The density of NH3 at 800 torr and 25 degrees is 0.7327 g/L
What is density?Density exactly is defined as the ratio of mass to volume. Although it is challenging to estimate the mass of gases using standard methods, it can typically be derived by dividing the mass of a matter by the volume it occupies. As a result, the ideal gas equation, PV = nRT, can be used to derive a formula for calculating the density of gas
formula for density d=P(FW)/RT
d = actually density, with an FW formula weight of 17.031 g/mol.
R = gas which is a constant, 0 .082 6 L atm K−1 mol−1
T = ,the exact temperature is 298k or 25c
P =Density ca n be calculated as follows:
d=P(FW)/RT
d = actually density, with an FW formula weight of 17.031 g/mol.
R = gas , which is the constant 0 .082 6 L atm K−1 mol−1
T =exact temperature is as 25 C or 298 K
P = pressure 1.053 atm or 800torr
Therefore,
d=P(FW)/RT
= 1.053 * 17.031 /0.08206 *298
= 0.733 g/ L
Therefore
d=P(FW)/RT
= 1.053 * 17.031 /0.08206 *298
= 0.733 g/ L
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What is the cation in KF?
A. K1-
B. F1+
C. K1+
D. F1-
Answer:
[tex]c. {k}^{1+} [/tex]
Explanation:
Because the charge of K is 1+ and the charge of F is 1-.
Cation is positively charged ion therefore
[tex] {k}^{ 1 + } [/tex]
is the Cation in KF
Option C is correct. The cation in KF will be K¹⁺
Cation: It is defined as the species or ions which carry positive charges. For example: Na⁺, Ca²⁺, NH⁴⁺, etc.
Potassium fluoride: Potassium fluoride is the chemical compound having chemical formula KF. After hydrogen fluoride, KF is the primary source of the fluoride ion for applications in manufacturing in chemistry. It is an alkali halide and it occurs naturally as the rare mineral carobbiite.
KHF₂ → KF +HF
The cation in KF will be K¹⁺. Because the charge of K is 1⁺and the charge of F is 1⁻.
Cation is positively charged ion therefore, K¹⁺is the Cation in KF
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Stoichiometry Worksheet
1. According to the equation, what mass of hydrogen fluoride is necessary to produce
2. 3 g of sodium fluoride?
HF + NaNO3 → HNO3 + NaF
Answer:
The stoichiometry of the equation tells us the ratios of the reactants and products. To determine the amount of hydrogen fluoride required to produce 3 g of sodium fluoride, we need to use the balanced chemical equation.
The balanced equation is:
HF + NaNO3 → HNO3 + NaF
1 : 1 : 1 : 1
Since the ratio of sodium fluoride to hydrogen fluoride is 1:1, we need an equal amount of hydrogen fluoride to produce 3 g of sodium fluoride, i.e. 3 g of hydrogen fluoride.
The amount of hydrogen fluoride required to produce 3 g of sodium fluoride would be 3 g.
Explanation:
he chart shows the movement of a ball after several seconds. A 2-column table with 4 rows. The first column labeled A has entries 0, 4, 8, 12, 16. The second column labeled B has entries 0, 2.5, 6, 8, 10. Column A is on the x-axis, and Column B is on the y-axis. Which titles should replace A and B?
The chart is showing the position -time graph of the movement of ball. The x-axis represents the time of travel and y-axis represents the position of the ball with respect to the time.
What is position -time graph ?The position - time graph is plotting the position of a moving object in with respect to different time. From this plot we can easily understand the displacement by an object. Similarly we can determine the speed of the object from the slope of the line.
The position is expressed in meters and the time is expressed in seconds. If the plot shows a linear curve, then the object is moving with constant speed.
Here, the position of the moving ball is given in y-axis 0, 2.5 m, 6, 8 and 10 meters with respect to the time given in x-axis as 0 ,4,8,12 and 16 seconds.
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draw curved arrow notation to convert the structure to a resonance structure where all atoms have octets.
The resonance structures are the set of the lewis structures which describes the delocalization of the electrons in the molecule.
The resonance structures shows the delocalization of the electrons in the molecule. The resonance structures are used to represent the multiple structures of the single polyatomic molecule. The resonance structures have the same number of the electrons, we can not add or subtract the electrons.
All the resonance structures should follow the rules of the writing the lewis structures. The same number of the paired and the unpaired of the electrons should take part in the resonance. The resonance structures are attached below .
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Based on the octet rule, how many electrons do atoms want to have?
Responses
A eighteight
B sixsix
C sevenseven
D eighteen
Answer:
Based on the octet rule, how many electrons do atoms want to have? -Ans: D (eighteen)
What is the formation of KCL with an electron dot structure?
The ions present in KCL are K⁺ and Cl⁻ which forms KCL by ionic bond. KCL is the chemical formula for potassium chloride. It is created when the extra electron from the potassium atom's valence shell is transferred to the chlorine atom's valence shell, completing the octet valency of both atoms.
What does potassium's electronic dot structure look like?K with one dot on the right stands for potassium. If the atom is a noble-gas atom, there are two additional processes that could be used. The outermost filled shell can be thought of as the valence shell, or we can assume that the atom has no valence electrons at all.
How does KCl generate its bonds?When compared to chlorine, which has seven electrons and only one valence electron, potassium provides the final electron that chlorine needs to complete its octet. As a result, potassium and chlorine create an ionic bond, resulting in the formation of potassium chloride.
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what is the percentage of the r enantiomer in a sample of carvone that has a specific rotation of −20, given that the specific rotation of (r)-carvone is −61?
The percentage of the R enantiomer in the sample of the carvone that has a specific rotation of −20°, the specific rotation of (r)-carvone is −61° is the 32.7 %.
The observed specific rotation = - 20 °
The pure specific rotation = - 61 °
The percentage of the R enantiomer in a sample of carvone is expressed as :
The percentage = ( observed specific rotation / original specific rotation) × 100 %
The percentage = ( - 20 / - 61 ) × 100 %
The percentage = 0.327 × 100 %
The percentage = 32.7 %
Thus, the percentage of the R enantiomer is 32.7 %
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A solution contains 22. 4 g glucose (c6h12o6) dissolved in 0. 500 l of water. What is the molality of the solution? the density of the solution is 1. 02 g/ml.
The molality of the solution is approximately 0.244 mol/kg.
What is molality?
Molality is a measure of the concentration of a solute in a solution, defined as the number of moles of solute per kilogram of solvent. Unlike molarity, which is a measure of the concentration of a solute in terms of the number of moles per liter of solution, molality is a measure of the concentration in terms of the mass of the solvent.
To find the molality of a solution, we need to know the mass of solute (glucose) and the mass of solvent (water) in the solution. The molality of a solution is defined as the number of moles of solute per kilogram of solvent.
Given that the solution contains 22.4 g of glucose dissolved in 0.500 L of water (which can be converted to mass using the density of water, 1 g/mL), we can find the molality as follows:
Convert the volume of the solvent to mass:0.500 L * 1.02 g/mL = 0.510 g (water)
Find the number of moles of solute:22.4 g / ( molecular weight of glucose, which is ~180.18 g/mol) = 0.1245 moles
Find the molality:0.1245 moles / (0.510 g / 1000 g/kg) = 0.244 mol/kg
So, the molality of the solution is approximately 0.244 mol/kg.
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How do you find the rate law of a reaction mechanism?
The mechanism of the reaction should theoretically reveal the rate law. By equating the derivatives of the reaction rate with respect to the reactant concentration to zero, it is possible to derive the rate law from the mechanism.
What are the different rate law of a reaction mechanism?Keep in mind the significant distinction between formulating rate laws for simple reactions and the chemical equation that balances the entire reaction. The concentration of our reactants can affect the rate of the reaction.
However, since it is a one-step mechanism and is thus also an elementary step, the rate law cannot be determined from the entire reaction's balanced chemical equation.
Therefore, The rate law of a chemical reaction is an equation that outlines the connection between the concentrations of the reactants and the reaction rate. The highest order of the derivatives dictates the sequence of the reaction.
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The mechanism of the reaction should theoretically reveal the rate law. By equating the derivatives of the reaction rate with respect to the reactant concentration to zero, it is possible to derive the rate law from the mechanism.
What are the different rate law of a reaction mechanism?Keep in mind the significant distinction between formulating rate laws for simple reactions and the chemical equation that balances the entire reaction. The concentration of our reactants can affect the rate of the reaction.
However, since it is a one-step mechanism and is thus also an elementary step, the rate law cannot be determined from the entire reaction's balanced chemical equation.
Therefore, The rate law of a chemical reaction is an equation that outlines the connection between the concentrations of the reactants and the reaction rate. The highest order of the derivatives dictates the sequence of the reaction.
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three ways in which compounds differ from mixtures
Compounds always have the same fixed chemical composition. The constituent chemicals that make up a combination can vary. Homogeneous or heterogeneous mixtures can exist. The only two methods that can be used to separate a compound's components are chemical and electrochemical ones.
Is heterogeneous a synonym for strange?The statement is untrue. In reality, they have different meanings and are different terms. A building is said to be heterogeneous if it has different parts or pieces that look erratic or discolored.
What is the difference between heterogeneous and homogeneous?The overall appearance and composition of a homogenous mixture are consistent. Solutions are the term used to describe a wide variety of homogenous mixtures. There are distinct constituents or stages in a heterogeneous combination. Gas, liquid, & solid matter exist inside the 3 parts or states.
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Compounds always have the same fixed chemical composition. The constituent chemicals that make up a combination can vary. Homogeneous or heterogeneous mixtures can exist. The only two methods that can be used to separate a compound's components are chemical and electrochemical ones.
Is heterogeneous a synonym for strange?
The statement is untrue. In reality, they have different meanings and are different terms. A building is said to be heterogeneous if it has different parts or pieces that look erratic or discolored.
What is the difference between heterogeneous and homogeneous?
The overall appearance and composition of a homogenous mixture are consistent. Solutions are the term used to describe a wide variety of homogenous mixtures. There are distinct constituents or stages in a heterogeneous combination. Gas, liquid, & solid matter exist inside the 3 parts or states.
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Thus the complete question is :
What are the three ways in which compounds differ from mixtures?
4. what is the color of phenolphthalein indicator in: a. acidic solution_______________________ b. basic solution_____________________
The color of the phenolphthalein indicator in:
a. acidic solution = colorless
b. basic solution = pink color
The color of phenolphthalein indicator in the acidic solution is the colorless and in the basic solution is pink color. The indicator is the substance that gives the visible sign, and a color change, of the presence or the absence of the threshold concentration of the chemical species like as the acid or an alkali in the solution.
In the acid-base titrations, the phenolphthalein is generally used as the indicator. It will turn the colorless in acidic solutions and gives the pink in basic solutions for this application.
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what is the osmolarity of a solution with a total volume of 2.5 liters is composed of 31.4 grams of na2s in water
a. Molarity of this solution?
b. Osmolarity of the solution c. The % mass/volume of this solution?
a. Molarity: 0.512 M
b. Osmolarity: 1.024 Osm
c. % mass/volume: 0.69 %
a. Molarity: Molarity is a measure of the concentration of a solute (salt, in this case) in a solution, expressed as moles of solute per liter of solution. To find the molarity, we need to divide the number of moles of solute (Na2S) by the volume of solution (2.5 liters):
moles of solute = 31.4 g / (mol weight of Na2S) = 31.4 g / 142.1 g/mol = 0.22 moles
Molarity = moles of solute / liters of solution = 0.22 moles / 2.5 liters = 0.512 M
b. Osmolarity: Osmolarity is a measure of the total concentration of solutes in a solution. It considers the number of particles that are produced when the solute dissociates in solution. In this case, Na2S dissociates into 2 sodium ions (Na+) and 1 sulfide ion (S2-), so the osmolarity of the solution is 2 times the molarity:
Osmolarity = 2 x Molarity = 2 x 0.512 M = 1.024 Osm
c. % mass/volume: This is a measure of the concentration of a solute in a solution, expressed as the mass of solute in grams per 100 ml of solution. To find the % mass/volume, we need to divide the mass of solute (31.4 g) by the volume of solution (2.5 liters) and multiply by 100:
% mass/volume = (mass of solute / volume of solution) x 100 = (31.4 g / 2.5 L) x 100 = 1,256 g/L x 100 = 126,560 g/L = 126.56 g/L = 0.69 %
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a neutral, sp-hybridized carbon can form sigma-bonds and pi-bonds?
A neutral, sp-hybridized carbon can form pi bonds.
What is sp hybridization?Sp hybridization refers to the mixing of an s orbital and a p orbital to form a new hybrid orbital. This type of hybridization occurs in atoms that have an octet of electrons in the valence shell, such as nitrogen and carbon, and requires the formation of one or more new sigma bonds between the atom and another atom.
In sp hybridization, the s orbital and one of the p orbitals combine to form two identical hybrid orbitals, each with 50% s character and 50% p character.
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You are conducting a calorimetry experiment using a calorimeter with 500 mL of water in its outer chamber to determine the enthalpy of reaction of a chemical reaction. The initial temperature of the water was 25 °C. After the reaction, the temperature of the water was 57. 4 °C. Disregarding any heat loss to the walls of the container, calculate the Hf). (The specific heat of the water is 4. 18J/(g times k)
The temperature of the water was 25 °C. After the reaction, the temperature of the water was 57. 4 °C. Disregarding any heat loss to the walls of the container, the enthalpy of the reaction is 68.18 kJ.
Enthalpy (H) is a thermodynamic quantity that represents the total heat content of a system. It is the sum of the internal energy of the system and the product of its volume and pressure.
In other words, enthalpy is a measure of the heat energy involved in a process or reaction. The unit of enthalpy is usually joules (J) or kilojoules (kJ).
The heat generated by the reaction (q) can be calculated as follows:
q = m * c * ΔT
where m is the mass of the water in the calorimeter (0.5 kg), c is the specific heat of water (4.18 J/(g * K)), and ΔT is the change in temperature (57.4 - 25 = 32.4 K).
q = 0.5 kg * 4.18 J/(g * K) * 32.4 K = 68.18 kJ
Since the heat generated by the reaction is equal to the heat absorbed by the water, the enthalpy of the reaction (ΔH) can be calculated as follows:
ΔH = q = 68.18 kJ
Therefore, The temperature of the water was 25 °C. After the reaction, the temperature of the water was 57. 4 °C. Disregarding any heat loss to the walls of the container, the enthalpy of the reaction is 68.18 kJ.
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A doctors office pi’s deciding between buying 2 different sized cups. The cups are shown. Before deciding which siz to buy, they determine how much water each size cup can hold. How much more water in cubic inches can the larger cup hold than the smaller cup?
The larger cup can hold 9.8 cubic inches more water than the smaller cup.
How much more water in cubic inches can the larger cup hold than the smaller cup?This is an example of the scientific process of experimentation and observation.The doctors office pi is attempting to determine which cup size to purchase.To do this, they need to observe and measure the capacity of each cup.They can measure the capacity of each cup by filling it with a known amount of water and then measuring the amount of water in cubic inches.Once they have measured the capacity of each cup, they can then compare the two and determine how much more water the larger one can hold than the smaller one.By using the scientific method, the doctors office pi can make an informed decision on which cup size to purchase.This example demonstrates how the scientific method can be used to make decisions based on facts and data.To learn more about The capacity differential between the two cups refer to:
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What is the difference between deutan and protan?
The difference between deutan and protan are mentioned below.
What is deutan ?
Deuteran color blindness, also known as deuteranomaly, is a form of red-green color blindness when the eye's green cones over- or under-recognize red and under-recognize green light. Red, yellow, green, and brown therefore have a tendency to seem alike, especially in dim lighting.
What is protan?
Those who have protanomaly, a form of red-green color blindness in which the red cones are overly sensitive to greens, yellows, and oranges and do not detect enough red, are known as proton. Because of this, colors like green, yellow, orange, red, and brown could look the same, especially in dim light.
A type of red green color blindness known as deutan is caused by an aberration in the M cone of the retina, whereas a variety of red green color blindness known as protan is caused by an anomaly in the L cone of the retina. The main distinction between deutan and proton is thus this.
Therefore, The difference between deutan and protan are mentioned above.
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How many of the following processes are nonspontaneous? climbing stairs dissolving salt in water converting table salt to its elements 2H2O(l) → 2H2(g) + O2(g) A) 0 B) 1 C) 2 D) 3 E) 4
The number of the following process are the non spontaneous is the correct option is D) 3.
The non spontaneous process is the process that requires the energy input to proceed further. The non spontaneous process requires energy to occur. In the non spontaneous process the total energy of the product formed is higher than the energy of the reactants. The non spontaneous reaction have the positive enthalpy and it will decreases the entropy.
Thus, the process which do not procced by itself or by its own and occur if external energy is provided then this process is said to be non spontaneous process.
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what gas fills the balloon in this experiment?
According to then question Helium is used to fill balloons in this experiment.
What is Helium?Helium is an inert, monatomic, non-toxic gas with the atomic number 2. It is the second most abundant element in the universe and the second lightest element on the periodic table. Helium is colorless, odorless, and tasteless, and it is non-flammable and non-reactive. It is used in a variety of applications, including welding, pressurizing rockets and space shuttles, and in cryogenic research. It is also used in medical imaging and in MRI scanners, as it has a low atomic number that makes it safe to use in these applications. Helium is also used in balloons, blimps, and airships, since its low density makes it a good lifting gas. Helium has a boiling point of -268.9 degrees Celsius and a melting point of -272.2 degrees Celsius, making it the coldest element on the periodic table.
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how does each of the following affect the rate of evaporation of a liquid in an open dish?
The factors that can affect the rate of evaporation of a liquid in an open dish are surface area, temperature, air movement, humidity, and concentration.
The following factors can affect the rate of evaporation of a liquid in an open dish:
1.Surface Area: The larger the surface area of the liquid, the faster it will evaporate. This is because a larger surface area allows more molecules to escape into the air, increasing the rate of evaporation.
2.Temperature: The temperature of the liquid directly affects its evaporation rate. The higher the temperature, the faster the liquid will evaporate. This is because the increased heat energy increases the kinetic energy of the molecules, allowing more of them to escape into the air.
3.Air Movement: The movement of air can increase the evaporation rate of a liquid. Air movement increases the rate of exchange of vapor and air, which increases the rate of evaporation.
4.Humidity: The relative humidity of the air affects the rate of evaporation of a liquid. If the air is already saturated with water vapor, it will be more difficult for the liquid to evaporate. The lower the relative humidity, the faster the liquid will evaporate.
5.Concentration: The concentration of solute in a solution affects the rate of evaporation. A more concentrated solution will evaporate more slowly than a less concentrated solution, as the increased number of solute molecules will interfere with the escape of solvent molecules into the air.
Overall, the factors that can affect the rate of evaporation of a liquid in an open dish are surface area, temperature, air movement, humidity, and concentration.
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How many moles of solid Ba(NO3)2 should be added to 300. mL of 0.20 M Fe(NO3)3 to increase the concentration of NO3 1- ion to 1.0 M? (Assume that the volume of the solution remains constant)
The number of moles of the solid Ba(NO₃)₂ added to the 300 mL of the 0.20 M Fe(NO₃)₃ to increase the concentration of NO₃⁻¹ ion to 1 M is 0.06 mol
The number of Fe(NO₃)₃ = molarity × volume
The number of Fe(NO₃)₃ = 0.20 × 0.300
The number of Fe(NO₃)₃ = 0.06 mol
Moles of NO₃⁻¹ = 0.18 mols present
Moles of NO₃⁻¹ need = 1 × 0.300 L
Moles of NO₃⁻¹ need = 0.300 mol
Number of moles he have = 0.300 - 0.180
= 0.120 mol
Ba(NO₃)₂ contains 2 moles of NO₃⁻¹, therefore number of moles of Ba(NO₃)₂ added :
Moles of Ba(NO₃)₂ = 0.120 / 2 = 0.06 mol
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b) at half-equivalence point, the ph is 11.58. what would be the kb of the weak base? enter a number only, no text
The pKb of the weak base can be calculated using the equation pKb = 14 - pH. In this case, pKb = 14 - 11.58 = 2.42.
This is because the pH scale is logarithmic, meaning that if the pH is lower than 7, the solution is acidic and if the pH is higher than 7, the solution is basic. In this case, the pH of the solution is 11.58, which is lower than 7 and indicates that the solution is acidic. Therefore, the pKb of the weak base can be calculated by subtracting 11.58 from 14, which gives a value of 2.42.
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