There's some characteristic that can distinguish between a strong and weak electrolyte:
1. in strong electrolyte when in aqueous solution, it totally dissociates into ions while weak electrolyt, in an aqueous solution, it partially dissociates into ions.
2.In strong electrolyte most free ions are present in the solution. while weak electrolyte both free ions and undissociated molecules can be found in its solution.
3. strong electrolyte concentration of ions in the solution is extremely high.
while in weak electrolyte Ion concentration in the solution is low.
4. Strong electrolyte has high electrical conductivity while weak electrolyte has some electrical conductivity.
An electrolyte splits into ions when it is dissolved in a solvent like water (or any other conductive species). Because of this, two or more moles of conductive species always result from the dissolution of one mole of electrolyte. As a result, when an electrolyte is dissolved in a solvent, the colliding characteristics of the electrolytes change significantly.
For instance, the following generic equation can be used to describe variations in freezing point and boiling point:
Tb = Kbm, and Tfz = Kfm.
Tfzeeze stands for freezing point depression and Tb for boiling point elevation. The freezing point depression constant is Kf, and the boiling point elevation constant is Kb. The solution's molarity is given by m. The aforementioned equations are adjusted as follows for electrolytic solutions:
iKbm for Tb and iKfm for Tfz
I stands for the Van't Hoff factor, an ion multiplier. The number of moles of ions provided by an electrolyte is equal to this factor. Therefore, the amount of ions released by an electrolyte during its dissolution in a solvent can be used to calculate the Van't Hoff factor. Van't Hoff factor values for NaCl and CaCl2, respectively, are 2 and 3, respectively.
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Please help I have been stuck for a min
What is the volume of 0.58 moles
of H2 gas at STP
Answer:
13.00 [tex]dm^{3}[/tex]
Explanation:
At S.T.P one mole of any gas requires 22.414 [tex]dm^{3}[/tex].
By setting up mole ratio between moles and volume;
moles : volume
1 : 22.414
0.58 : X
X = 0.58 x 22.414
X = 13.00 [tex]dm^{3}[/tex]
13. calculate the freezing point and boiling point of an antifreeze solution that is 50.0% by mass of ethylene glycol (hoch2ch2oh) in water. ethylene glycol is a nonelectrolyte.
The Freezing point = 243 K, and Boiling point = 108.250C if antifreeze solution that is 50.0% by mass of ethylene glycol (hoch2ch2oh) in water.
What is the main source of ethylene?petroleum hydrocarbons Over 95% of the worldwide annual commercial production of ethylene is currently based on steam cracking of petroleum hydrocarbons. Various feedstocks, including ethane, propane, butanes, naphthas and gas oils, are used to produce ethylene.
Where is ethylene found?Natural sources of ethylene include both natural gas and petroleum; it is also a naturally occurring hormone in plants, in which it inhibits growth and promotes leaf fall, and in fruits, in which it promotes ripening. Ethylene is an important industrial organic chemical.
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1. ni2 (nhbr, ph,o where m, n, and p represent the coefficients in the formula. an analysis of the salt can be obtained if a sample is dissolved by an acid-base reaction in excess acid and then the excess is titrated with naoh. that is, excess hci oh-h20 a 0.185-g sample of the nickel salt was dissolved in 30.00 ml of 0.1013 n hci. the excess hcl required 6.30 ml of 0.1262 n naoh to reach the end point. calculate the weight of the salt that contains one mole of nh3 (that is the equivalent weight of the salt) 2. propose a molecular formula for the salt in 3ni2(nh)mbrn ph20 that is consistent with this experimental equivalent weight.
The molecular formula for the salt consistent with this experimental equivalent weight is Ni2(NH2)Br(H2O).
What is acid-base reaction?The exchange of one or more hydrogen ions, H +, between species that may be neutral (molecules like water, H 2 O, or acetic acid, CH 3 CO 2 H) or electrically charged (ions like ammonium, NH 4+, hydroxide, OH, or carbonate, CO 32) is known as an acid-base reaction.
The first step to determining the equivalent weight of the salt is to calculate the number of moles of HCl that were used to neutralize the sample. This can be done by using the following formula:
moles HCl = (volume HCl) x (molarity HCl)
moles HCl = (30.00 mL) x (0.1013 mol/L) = 3.04 x 10^-2 mol
Next, we need to calculate the number of moles of NaOH that were used to neutralize the excess HCl. This can be done by using the following formula:
moles NaOH = (volume NaOH) x (molarity NaOH)
moles NaOH = (6.30 mL) x (0.1262 mol/L) = 7.97 x 10^-3 mol
We can use this number to calculate the number of moles of salt that was present in the original sample.
moles salt = (moles HCl) = 7.97 x 10^-3 mol
Now we can use this number to calculate the equivalent weight of the salt. The equivalent weight of a substance is defined as the molar mass of the substance divided by the number of moles of the substance that react with one mole of H+.
Equivalent weight of the salt = (mass of salt) / (moles of salt)
Equivalent weight of the salt = (0.185 g) / (7.97 x 10^-3 mol) = 23.2 g/mol
From the equivalent weight of the salt, we can observe that the equivalent weight is consistent with the formula Ni2 (NH)mBrn(H2O)p (where m,n,p represent coefficients in the formula).
The molar mass of Ni2 (NH)mBrn(H2O)p = 2*(Ni) + m*(NH3) + n*(Br) + p*(H2O)
2*(Ni) + m*(NH3) + n*(Br) + p*(H2O) = 23.2 g/mol
Therefore, the molecular formula for the salt consistent with this experimental equivalent weight is Ni2(NH2)Br(H2O).
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In order to determine the answer to a chemistry problem, a student first converted the given percentages to mole by assuming the sample size was 100 grams. Then the student divide by the smallest mole amount of the elements present. Finally the student used the ratios to write a formula. Which of the following best describes the problem the student likely solved
The right response is To determine the compound's molecular formula, this ratio is used. First, a student assumed the study sample was 100 grams and converted the percentages to moles.
My buddy, the method used to calculate the empiric formula of a chemical is the method utilized here.By 1. calculating the molecular mass of each element from its mass, empirical formulas are generated using experimentally measured element masses.
2.Returning subscripts for a possible empirical formula by dividing the molar amount of each element by the minimum molar amount.
3. The chemical formula of the molecule is determined using this ratio.
How many molecules make up each mole of a compound?Molecules to Mole Conversion. Avogadro's number can be used to convert across molecules and moles by multiplying or dividing: The amount of moles must be multiplied be 6.02 x 1023 to convert to molecules. Divide the number of molecules with 6.02 x 1023 to convert it to moles.
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what is the mass (in kg) of 6.89 × 1025 molecules of co2? the molar mass of co2 is 44.01 g/mol. (Show work on scratch paper) o 5.04 kg o 6.39 kg o 3.85 kg o 3.03 kg o 2.60 kg
The mass of the molecule of CO₂ is 5.04 kg
Avogadro's number represents the number of units in one mole of any substance. This has the value of 6.022 x 10²³units / mole.
It is used to make very large number easier to handle.
Firstly we will calculate the moles of CO₂
As, 6.022 x 10²³ molecules of CO₂ is present in 1 mole of CO₂
So, 6.89 × 10²⁵ molecules of CO₂ present in mole of CO₂will be found as
6.89 × 10²⁵/6.022 x 10²³ = 114.4 moles of CO₂
Now we have to calculate the mass of CO₂
mass = moles × molar mass
mass =114.4 moles× 44.01 g/mol
mass = 5.034 Kg
So it will be nearly equal to 5.04kg
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The equilibrium for the acid ionization of HC2H3O2 is represented by the equation above. A student wants to prepare a buffer with a pH of 4.76 by combining 25.00mL of 0.30MHC2H3O2 with 75.00mL of 0.10MNaC2H3O2. While preparing the buffer, the student incorrectly measures the volume of NaC2H3O2 so that the actual volume used is 76.00mL instead of 75.00mL. Based on the error, which of the following is true about the buffer prepared by the student
Based on the error, buffer solution will have a slightly higher capacity for the addition of acids than for addition of bases because the amount of C2H3O2− added was higher than the amount of HC2H3O2 added.
What is meant by buffer solution?An aqueous acid or base solution that combines a weak acid with its conjugate base, or vice versa, is known as a buffer solution.
By neutralizing additional acids or bases, buffer solutions keep the pH level steady. A weak acid and its conjugate base make up these compounds, which exchange protons and hydroxide ions to create water. The pH is expressed in terms of the PKa and the ratio of the base to acid concentrations using the Henderson-Hasselbalch equation.
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how do different molecules exert different force of attraction on each other resulting in different solubilities within different solvents
Chemists use the phrase, "like dissolves like" to describe how varying polarity causes molecules to interact with one another. Both polar and non-polar chemicals will dissolve in other polar and non-polar substances, respectively. Although compounds can have varying degrees of polarity, they are rarely completely polar or non-polar. Different molecules attract each other using different forces, which affects how well they dissolve in various solvents. It is feasible to separate mixtures into their individual components due to variations in solubility.
It is feasible to separate mixtures into their individual components due to variations in solubility. On the other hand, two phases will emerge if the solvent molecules have a significant attraction to one another but minimal affinity for the solute molecules. The well-known fact that oil and water do not mix, or if they do, do not mix for very long, is a typical illustration of the second scenario mentioned in the preceding sentence. Alkanes and other nonpolar molecules make up oil, but polar water molecules may create strong hydrogen bonds with one another.
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the precise weight of a mole of some pure elements like silicon (si) can vary slightly from the standard atomic mass, or even from sample to sample. why?
The element may have multiple stable isotopes, and the isotopic composition may vary from sample to sample.
Isotopes are two or more atom types that have the same atomic number (number of protons in their nuclei), location in the periodic table, and chemical element, but differ in nucleon numbers (mass numbers) because they have varying quantities of neutrons in their nuclei. Each isotope of a specific element has virtually identical chemical properties, but they vary in terms of their atomic weights and other physical attributes. The total number of protons in the nucleus plus the total number of electrons in a neutral (non-ionized) atom make up an atom's atomic number.
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How many grams of C4H10 must I burn to produce .86 grams of waterHelp me i need this done ASAP im taking my final rn
Answer: 0.545 grams of [tex]C_{4} H_{10}[/tex] on burning will give 0.86 grams of water.
Explanation: The molecular mass of water is 18 grams/mole.
therefore, 0.86 grams of water = 0.86/18 (mass/molecular weight)
= 0.047 moles
Now, by unitary method :
Since by the equation, We can already tell 10 moles of water is produced by burning 2 moles of C_{4} H_{10}.
∴ 10 moles of water → 2 moles of C2H10
1 mole of water → 2/10 moles of C2H10
0.047 Moles of water → 0.047 x (2/10) moles of C2H10
∴ We will need 0.0094 Moles of C2H10 to produce 0.86 grams of water which is 0.545 Grams (moles x Molecular mass = required weight)
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In the lab, you looked at speed-time graphs to determine the acceleration of the cart for each of the three fan speeds. What was the acceleration of the cart with Low fan speed
In the lab, you looked at speed-time graphs to determine the acceleration of the cart for each of the three fan speeds. The acceleration of the cart with Low fan speed is 18 cm/s².
The acceleration of the cart with Low fan speed is :
The acceleration is given as :
a = ( Vf - Vi ) / (t f - t i )
by substituting the value in the acceleration formula , we get:
a = 125 - 0 / 7
a = 125 / 7
a = 18 cm/s²
Thus the acceleration of the cart with the low fan speed is 18 cm/s².
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in the redox titration of fe2 with ce4 to form fe3 and ce3 , what is the predominant form of cerium after 120 ml of ce4 has been added to the fe2 solution
In the redox titration of Fe2+ with Ce4+, the predominant form of cerium after 120 ml of Ce4+ has been added to the Fe2+ solution would be Ce3+.
The redox reaction occurring in this titration is:
2Fe2+ + Ce4+ -> 2Fe3+ + Ce3+
As Ce4+ is added to the Fe2+ solution, it reacts with the Fe2+ ions to form Fe3+ ions and Ce3+ ions. The number of moles of Ce4+ added equals the number of moles of Fe2+ present in the solution. So, as 120 ml of Ce4+ is added, the number of moles of Ce4+ present will equal the number of moles of Fe2+ present in the solution.
As the reaction proceeds and more Ce4+ is added, the concentration of Ce3+ ions will increase, while the concentration of Ce4+ ions will decrease. Once the stoichiometric point has been reached, the solution will contain Ce3+ ions as the predominant form of cerium.
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Consider the following reaction: H2(g)+I2(g)⇌2HI(g) A reaction mixture at equilibrium at 175 K contains PH2=0.958atm, PI2=0.877atm, and PHI=0.020atm. A second reaction mixture, also at 175 K, contains PH2=PI2= 0.617 atm , and PHI= 0.110 atm . Is the second reaction at equilibrium? Is the second reaction at equilibrium? yes no If not, what will be the partial pressure of HI when the reaction reaches equilibrium at 175 K?
The partial pressure of Hi is mathematically P(HI)= 0.0135atm. Yes the reaction is in equilibrium.
The pressure exerted by an individual gas in a mixture is known as its partial pressure.
Each gas in a mixture adds to the overall pressure of the mixture. This portion represents the pressure. The pressure a gas would have if it were in its own volume and at its own temperature is known as the partial pressure.
Generally, the equation for the Reaction
H₂(g) + I₂ (g )↔ 2HI(g)
Therefore
Kp₁ = P(HI)²/ p(H₂)×p(I₂)
Kp₁= (0.02)² / 0.958×0.877
Kp₁= 4.8x10⁻⁴
And
Kp₂ = (0.110)²/ 0.617×0.617
kp₂ = 0.0121 /0.380689
Kp₂= 0.0317
Therefore, for the partial pressure of HI
4.8x10⁻⁴ = P(Hi)² / (0.617×0.617)
P(HI)= 0.0135atm
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Activity 2: My Characteristics
Directions: After exploring the amazing asteroids, comets, and meteors, test yourself if you
can compare and differentiate the three: comets, meteors, and asteroids. Below are some
characteristics of comets, meteors, and asteroids (1-15).
Choose from the following (A-G), and write the letters before each characteristic in your
activity notebook.
A. if it refers to comets
B. if it refers to meteors
C. if it refers to asteroids
D. both comets and meteors
E. if it refers to both meteors and asteroids
F. if it refers to both asteroids and comets
G. if it refers to all (comets, meteors, and asteroid)
Characteristics:
1. Progress across the sky very slowly
2. Known as falling stars or shooting stars
3. Remnants of the formation of the solar system
4. They glow as they enter the earth's atmosphere
5. Reflect sunlight
6. Rocky composition
7. Orbit the sun in highly elliptical orbits s
8. Minor planets
9. Mostly found between Mars and Jupiter
10. Can reach 150 million km in length
11. Most have slightly elliptical orbits
12. The result from the collision of asteroids
13. Streak across the sky very fast
14. Come in all sizes and shapes
15. Icy object
Answers:
ABGBFEACCAGEBGAExplanation:
Progress across the sky very slowly - This characteristic refers to cometsKnown as falling stars or shooting stars - This characteristic refers to meteorsRemnants of the formation of the solar system - This characteristic refers to all (comets, meteors, and asteroid)They glow as they enter the earth's atmosphere - This characteristic refers to meteorsReflect sunlight - This characteristic refers to both asteroids and cometsRocky composition - This characteristic refers to both meteors and asteroidsOrbit the sun in highly elliptical orbits - This characteristic refers to cometsMinor planets - This characteristic refers to asteroidsMostly found between Mars and Jupiter - This characteristic refers to asteroidsCan reach 150 million km in length - This characteristic refers to cometsMost have slightly elliptical orbits - This characteristic refers to all (comets, meteors, and asteroid)The result from the collision of asteroids - This characteristic refers to both meteors and asteroidsStreak across the sky very fast - This characteristic refers to meteorsCome in all sizes and shapes - This characteristic refers to all (comets, meteors, and asteroid)Icy object - This characteristic refers to cometsyou have 0.5 l of air at 203 k in an expandable container at constant pressure. you heat the container to 273 k. what is the volume of air? responses 0.25 l 0.25 l 0.37 l 0.37 l 0.67 l 0.67 l 1.5 l
The volume of air at 273 K would be 0.67 L by Gas Law. The ideal gas law, a state equation for all gases, states: PV is equal to nRT, where n is the number of moles of the gas and 8.314 joules per kelvin per mole is the universal (or perfect) gas constant.
According to the Ideal Gas Law, all gases have an equal number of molecules when they are at the same temperature, pressure, and volume (but not the same mass)
V1=0.5 L
T1=203 K
T2 = 273 K
V2 = unknown.
Now, [tex]\frac{V1}{T1}[/tex] = [tex]\frac{V2}{T2}[/tex]
So,
0.5L/203 = V2/273
V2= 0.67 L
So, Volume of gas will be 0.67 L.
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how is the density of solid water compared to that of liquid water atypical among substances? why is this significant?
Solid water is less dense as compared to the liquid water, that is why ice floats rather than sinks. This unusual property is because of hydrogen bonding between the molecules.
What is the density of solid water and liquid water?The density of ice is around 90 percent as compared to that of water, but that can vary as ice may also have air. Hence, it implies that around 10 percent of an ice cube will be above water line.
The solid form of most of the substance is denser than liquid phase and so block of most solids will sink in liquid but block of ice floats in the liquid water because ice is less dense. On freezing, density of the water reduces by about 9%.
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there is 5% (vol/vol) ethanol (c2h5oh) molecules found in a 12-oz (356 ml) bottle of budweiser beer? density of ethanol is 789 kg m-3. how many hydrogen atoms are found in that same bottle of beer?
The same bottle of beer contains 1.09 x 10²⁴ hydrogen atom
The hydrogen atom in the bottle of beer can be calculate as follows:
First we should find the moles of the ethanol
We know that moles = mas / mass molar, but the question give us the density of the ethanol
We also knew that density = mass/ volume
To find the mass of ethanol we should calculate the volume first
Volume of ethanol = 5% = 0.05
Volume of ethanol = 0.05 × 356= 17.8 mL
Density of ethanol = mass/ volume
mass of ethanol = Density x volume
mass of ethanol = 0.789 g/ mL x 17.8 mL = 13. 884 g
Molecular weight of ethanol (C 2H 5OH)=2×12+5+16+1=46 g/ mol
so 46 g C 2H5OH has 6g H
∴13. 884 g C2H5OH = 6 x 13.884 g x 6.02 x 10 ²³= 1.09 x 10²⁴ H atom
46
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an element reacts with chlorine gas to form a compound whose formula is xcl4. if the percent mass of chlorine is 74.8% in this compound, what is the identity of x?
An element reacts with chlorine gas to form a compound whose formula is XCl₄. if the percent mass of chlorine is 74.8 % in this compound, the identity of X is Ti, titanium.
The formula of the compound is XCl₄.
The molar mass of the chlorine = 35.5 g/mol
For 4 mol Cl = 4 × 35.5
= 142 g
The mass of XCl₄ = 142 × (100 / 74.8)
= 189.8 g/mol
The molar mass of the X = 189.8 - 142
= 47.8 g/mol
The molar mass of the titanium id 47.8 g/mol. Therefore , the identity of X is Ti.
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4al 3o2 --> 2al2o3 which mole ratio describes how much oxygen is required to produce 10 moles of product?
The mole ratio 2/3 describes 15 moles of oxygen is required to produce 10 moles of product.
The mole ratio is what?In a balanced chemical reaction, the ratio of any two compounds' mole amounts—measured in moles—is known as the mole ratio. In the balance chemical equation, the ratios of the molecules required to complete the reaction are compared.
Given chemical reaction,
4Al + 3O₂ → 2Al₂O₃
As per the equation 2 moles of aluminum oxide produces 4moles of aluminum and 3 moles of Oxygen.
The ratio of Al to oxygen = 2moles/3moles = 2/3
no moles of oxygen × 2/3 = 10 moles of Al₂O₃
no moles of oxygen = 10 × 3/2
no moles of oxygen = 30/2
no moles of oxygen = 15.
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why are polar gases, such as h2o and nh3, more likely to deviate from the ideal gas behaviors described by the kinetic molecular theory?
Polar gases, such as H2O and NH3, deviate from the ideal gas behaviors described by the kinetic molecular theory because they have a non-zero dipole moment.
This means that the electron density is not evenly distributed throughout the molecule, creating regions of positive and negative charge. This gives rise to intermolecular forces known as dipole-dipole interactions, which are stronger than the purely repulsive forces that exist between nonpolar molecules.
These additional forces result in a deviation from the ideal gas behavior, such as a decrease in the critical temperature and an increase in the boiling point.
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How many significant figures are there in the following number? 801.5
There can be 4 significant figures in the number given, i.e., 801.5.
What are significant numbers?In positional notation, significant figures are the digits in a number that are trustworthy and required to denote the amount of something.
Significant figures are the number of digits that add to the correctness of a value, frequently a measurement.
The first non-zero digit is where we start counting significant figures. Determine how many significant digits there are given a range of numbers.
A number's first zeros are not significant if their primary purpose is to contain the decimal point. Only when there are decimal points in the numerical quantities can trailing zeroes qualify as significant figures; otherwise, they do not.
Thus, as the position of zero is in between the digits, so it can be counted in significant number. So, it have 4 significant figures.
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A potato chip has a mass of 52.4 decigrams. What is the mass of the chip in grams?
A decigram is one-tenth of a gram, so to convert the mass of the chip from decigrams to grams, we need to multiply it by 10.
52.4 decigrams * 10 = 524 grams
So, the mass of the chip in grams is 524 grams.
A cheetah can run 68-75 miles per hour! Would this be considered an instantaneous speed, a
constant speed, or an average speed? Explain.
Answer:
This would be considered an average speed, as it's an estimate of how fast the cheetah can run over a certain distance, taking into account variations in its speed. It's not instantaneous, which would refer to the speed at a specific moment, and it's not constant, which would refer to the same speed being maintained over a period of time.
5.an experiment requires 2mm ascorbic acid in a final volume of 100mls. how much of a 1m stock of ascorbic acid and how much water are needed to make this?
20ul of a 1M stock of ascorbic acid and 100mls of water is needed to make 2mm of ascorbic acid in a final volume of 100mls
To make a 2mm solution of ascorbic acid in a final volume of 100mls, we first need to calculate how many moles of ascorbic acid are required. We can use the formula:
molarity = moles of solute / liters of solution
Given that we need 2mm of ascorbic acid, we can calculate the number of moles of ascorbic acid required: 2mm = 2 x 10^-3 molar
We are told that the final volume is 100mls = 0.1Lmoles of ascorbic acid = molarity x liters of solution = 2 x 10^-3 x 0.1 = 2 x 10^-4 moles
To make a 1M stock solution, we know that 1 mole of solute is dissolved in 1 liter of solvent.
volume of 1M stock solution = moles of solute / 1 = 2 x 10^-4 moles / 1 = 2 x 10^-4 L = 20 ul.
The total volume of the final solution is 100mls = 0.1L. The volume of the 1M stock solution is 20ul = 2 x 10^-5L. So the volume of water needed for the final solution is:0.1L - 2 x 10^-5L = 0.09998 L ≈ 100mls So, you need 20ul of a 1M stock of ascorbic acid and 100mls of water to make 2mm of ascorbic acid in a final volume of 100mls.
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In an experiment, 2.0 moles of oxygen atoms reacts with 80.1 g of calcium to form a new compound. What is the percent composition by mass of each element in the new compound?
Explanation:
The balanced equation for the reaction is:
2 O + Ca → Compound
From the information given, we know that 2.0 moles of oxygen atoms reacts with 80.1 g of calcium. To find the percent composition by mass of each element in the new compound, we first need to determine the molar mass of the compound.
The molar mass of the compound can be calculated by adding up the molar masses of oxygen and calcium.
Molar mass of O = 2 x (16.00 g/mol) = 32.00 g/mol
Molar mass of Ca = 40.08 g/mol
Molar mass of Compound = 32.00 g/mol + 40.08 g/mol = 72.08 g/mol
Now we can use this information to find the percent composition by mass of each element in the compound.
% mass of O = (moles of O x molar mass of O) / molar mass of Compound x 100
% mass of O = (2.0 moles x 32.00 g/mol) / 72.08 g/mol x 100 = 44.68%
% mass of Ca = (moles of Ca x molar mass of Ca) / molar mass of Compound x 100
% mass of Ca = (80.1 g / 40.08 g/mol) / 72.08 g/mol x 100 = 55.32%
So, the percent composition by mass of oxygen in the new compound is 44.68% and the percent composition by mass of calcium in the new compound is 55.32%
the chemical secreted into the gap between neurons at a synapse
The chemical secreted into the gap between neurons at a synapse is called the neurotransmitter.
Neurotransmitters - Chemicals released by neurons following an action potential. Neurotransmitters travel across synapses to excite or inhibit target neurons. Different types of neurons use different neurotransmitters and thus have different effects on their targets. There is a small gap between the axon terminal of the presynaptic neuron and the membrane of the postsynaptic cell, this gap is called the synaptic cleft. A chemical synapse uses the release of chemical neurotransmitters to pass signals from one neuron (presynaptic) to another (postsynaptic). Synapses contain small gaps that separate neurons.
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The solubility in water of ionic compound is measured and found to be at . Calculate the volume of a saturated solution of in water that would contain of at this temperature. Be sure your answer has the correct unit symbol and significant digits.
The solubility in water of ionic compound is measured and found to be at, In order to equal 34.0g of X, the volume of a saturated solution of X in water is 43.9 ml.
The amount of solute that dissolves in 100 ml of the solvent at a specific temperature is known as solubility.
Given: Ionic substance X dissolves in water at a rate of 0.776 g/ml
One ml of X contains 0.774 g of X.
Thus, = contains 34.0 g of X.
Therefore, 43.9 ml is the volume of a saturated solution of X in water that contains 34.0g of X.
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contractor jackson 845 rue sherbrooke west montréal qc h3a0g4
The address "845 Rue Sherbrooke West, Montreal, Quebec, Canada" refers to a specific location, in this case, the location of a contractor named Jackson. The address contains the street name "Rue Sherbrooke West" in the city of Montreal, Quebec, Canada.
The 'H3A 0G4' postal code is a code system used to identify specific regions in Canada. Useful for mail sorting and delivery. The first three letters "H3A" represent the Forward Sorting Area (FSA), which usually corresponds to part of a city or county. The last three characters "0G4" represent the Local Delivery Unit (LDU) for a specific building, group of buildings, or single address.
The address of the contractor's office or location where the contractor operates, which may be an office building, workshop, warehouse, etc.
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what type of decay does not result in a change in atomic number? what type of decay does not result in a change in atomic number? alpha beta-minus isomeric transition beta-plus
A type of decay known as beta-minus decay doesn't change the atomic number. For the two kinds of beta decay, the names "beta minus" and "beta plus" are used. beta minus's degeneration.
When a proton decays into a neutron via beta decay () decay, a positron and an electron are created; nevertheless, when a neutron decays into a proton, an electron and an electron antineutrino are formed. The nuclear charge number (sign Z) of an atomic nucleus is the chemical element's atomic number. The proton number (np), or the number of protons in the nucleus of each atom of that element, is identical to this for conventional nuclei. A type of decay known as beta-minus decay doesn't change the atomic number. For the two kinds of beta decay.
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how many molecules of ethanol ( c2h5oh ) (the alcohol in alcoholic beverages) are present in 185 ml of ethanol? the density of ethanol is 0.789 g/cm3 .
In 185 ml of ethanol, there are 1.7043 * [tex]10^{24}[/tex] molecules of ethanol (c2h5oh), the alcohol found in alcoholic beverages.
Is ethanol an alcohol substitute?Alcohols are organic compounds made of the elements hydrogen (H), oxygen (O), and carbon (C). Alcohol with 2 carbons is referred to as octane (also known as ethyl alcohol). Beer, wine, and vodka all include the kind of alcohol known as ethanol.
mass = density * volume
mass = 0.789 * 185
mass = 145.965 g
Then, using the formula C2H5OH, get the molecular weights of ethanol:
mass of H = 1
mass of C = 12
mass of O = 16
Mr = 2*12 + 1*16 + 6*1
Mr = 46 g/mole
Now you can determine how many moles are present in that mass:
# of moles = mass / Mr
# of moles = 130.185/ 46
# of moles = 2.83 moles
From there, you would analyze how many molecules there are:
# of molecules = moles * NA
# of molecules = 2.83 * 6.0221415 * 10^23
# of molecules = 1.7043 * 10^24
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How many liters of water would you need to add to 4. 36
moles of NaCl to create a 6. 43 M solution?
M
4.36 would require 0.67 L liters of water to be added. The number of moles of solute per liter of solution is known as molecularity or molar concentration.
Is molarity and normalcy always equal?A multiple of molarity is what is meant by normality. While "molarity" refers to the concentration of a substance or ion in a solution, "normality" refers to the molar concentration of simply the solution's basic or acid components, respectively.
What are molarity and normalcy?Molarity is the measure of the amount of solute per liter of solution (). The quantity of moles of solute per kilogram of solvent is expressed in terms of molality (). "Normality" is defined as the number of equivalents per liter of solution ().
Molarity = Number of moles / liters
6.43 M = 4.36 mol / liters
liters = 4.36 mol / 6.43 M
liters = 0.67 L
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