Answer:
Explanation:
To determine the pH of pure water at 40.0°C, we need to use the equation for the ionization constant of water (Kw) and the relationship between pH and the concentration of hydrogen ions (H+).
The equation for Kw is:
Kw = [H+][OH-]
In pure water, the concentration of hydrogen ions (H+) and hydroxide ions (OH-) are equal, so we can rewrite the equation as:
Kw = [H+][H+]
Taking the square root of both sides of the equation, we have:
√(Kw) = [H+]
Given that Kw at 40.0°C is 2.92 x 10^(-14), we can substitute this value into the equation:
[H+] = √(2.92 x 10^(-14))
Calculating the square root, we find:
[H+] ≈ 1.71 x 10^(-7)
To find the pH, we use the formula:
pH = -log[H+]
Substituting the value of [H+], we have:
pH = -log(1.71 x 10^(-7))
pH ≈ 6.767
Therefore, the pH of pure water at 40.0°C is approximately 6.767.
The correct answer is B) 6.767.
Answer:
B) 6.767
Explanation:
In a voltaic (galvanic) cell, oxidation occurs at the _____ and is where _____ in the salt bridge moves toward.
In a voltaic (galvanic) cell, oxidation occurs at the anode and is where anions in the salt bridge moves toward.
What is Galvanic Cell ?Galvanic Cell or Voltaic Cell is an electrochemical cell that converts the energy of spontaneous redox reactions into electrical energy. In galvanic cell oxidation occurs at the anode and reduction occurs at the cathode. The anode is positive and cathode is negative, anode attracts anions from solution in an electrolytic cell.
Thus from the above conclusion we can say that In a voltaic (galvanic) cell, oxidation occurs at the anode and is where anions in the salt bridge moves toward.
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The emission spectrum of sodium is shown below. What do the two bright
yellow vertical lines in the spectrum show about sodium atoms?
The two lines show that these are the only two lines that do not cause energy transition in the sodium atom. Option D
What are the two lines in the spectrum of sodium atom?The spectrum of the sodium atom appears as a doublet. This implies that there are two lines in the spectrum and they appear as bright yellow lines that are not spaced apart in the spectrum.
The two bright yellow vertical lines in the spectrum shows that these are the only two lines that do not cause energy transition in the sodium atom.
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Which models of the atom from task 1 are not supported by rutherfords experimental evidence?
Model not supported is:
Thomson's atomic model of the atom from task 1 are not supported by Rutherford's experimental evidence.
Experiments given by Thomson, Rutherford & Dalton:
The cathode ray tube experiments of J.J. Thomson demonstrated that all atoms contain minute, electron-like subatomic particles that are negatively charged.The plum pudding model of the atom was put up by Thomson and featured negatively charged electrons embedded within a positively charged "soup."The majority of an atom is empty space, with a small, dense, positively-charged nucleus, as demonstrated by Rutherford's gold foil experiment.Rutherford postulated the nuclear model of the atom in light of these findings.Atoms, in Dalton's opinion, are the tiniest pieces of matter that can never be further divided. This belief persisted up until the time it was learned that the atom was made up of subatomic particles.Dalton and Thomson's concepts are in conflict with the experimental findings of Rutherford. Dalton's model is unsupported by evidence because it does not include electrons, protons, or neutrons.
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How many molecules of H₂O are
equivalent to 97.2 g H₂O?
(H = 1.008 g/mol, O = 16.00 g/mol)
[?]
[?]x10 molecules
Enter your answer with the correct number of
significant figures and be sure the prefix is a number
between 1 and 10!
dro's Number = 6.02 x 1023 molecules/mole
Answer:
3.25 x 10²⁴ molecules H₂O
Explanation:
To find the number of H₂O molecules, you need to (1) convert grams to moles (via molar mass) and then (2) convert moles to molecules (via Avogadro's Number). It is important to arrange the ratios/conversions in a way that allows for the cancellation of units. The final answer should have 3 sig figs to match the amount of sig figs in the given value.
Atomic Mass (H): 1.008 g/mol
Atomic Mass (O): 16.00 g/mol
Molar Mass (H₂O): 2(1.008 g/mol) + 16.00 g/mol
Molar Mass (H₂O): 18.016 g/mol
Avogadro's Number:
6.02 x 10²³ molecules = 1 mole
97.2 g H₂O 1 mole 6.02 x 10²³ molecules
------------------ x ------------------- x ------------------------------------ =
18.016 g 1 mole
= 3.25 x 10²⁴ molecules H₂O
What, approximately, is the highest concentration of co2 measured in the earth's atmosphere in modern times?
In modern times the highest concentration of [tex]CO_{2}[/tex] measured in the earth's atmosphere is 400 ppm.
The concentration of the [tex]CO_{2}[/tex] which is also refereed as global annual is increased by 50%.The rise in concentration of the [tex]CO_{2}[/tex] start from 280 ppm during [tex]10^{4}[/tex] years up to the mid-18th century to 421 ppm as of May 2022.The reason behind the rise of concentration of the [tex]CO_{2}[/tex] is the Industrial Revolution.The concentration of the [tex]CO_{2}[/tex] is rises in such pace the it is very dangerous for human health and environment.Learn about global annual
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Which properties does uranium-238 have?
The main properties of uranium-238 are as follows,
The uranium-238 have orthorhombic crystal structure.The physical state of uranium-238 is solid.The uranium-238 have acid base properties.The uranium-238 have hard and silver white metal.The natural abundance of uranium-238 is 99%The Atomic mass and atomic weight of uranium-238
The atomic number of uranium-238 is 92The atomic weight of uranium-238 is 238.02learn about uranium-238
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The molecule CH₂O contains two single bonds and one double bond. True or false
Answer:
The answer to your question is True
Explanation:
CH2O is a polar molecule. It has three polar bonds that are arranged asymmetrically, thus allowing their dipole moments to add up and give the molecule an overall dipole moment. CH2O has a central carbon atom that forms two single bonds with the two hydrogen atoms and a double bond with the oxygen atom.
I hope this helps and have a good day!
what causes a wavy pattern of dark and light bands on the bottom of a pond? A P E X learning
A wavy pattern of dark and light bands on the bottom of a pond is caused by refraction of light waves through a rough surface; option D.
What is destructive interference?Destructive interference occur when two waves come in contact with each other and cancel each other out.
Reflection and refraction of light waves can result in destructive interference. An example of destructive interference due to refraction of light is a wavy pattern of dark and light bands on the bottom of a pond.
In conclusion, destructive interference occurs when waves cancel each other out.
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The answer to the question is D.
a plant cell has a solute potential of -2.0 bars and pressure potential of 0.0. what is its water potential? show your work if it is placed in a solution with a water potential of -1.0 what will happen to this plant cell
A plant cell has a solute potential of -2.0 bars and pressure potential of 0.0. Its water potential is -2 bar. The cell will gain water or swell.
What is Water Potential ?Water Potential is the potential energy of water in a system per unit volume relative to pure water , when both pressure and temperature are kept same. Water potential is never positive. It is expressed in kPa (Kilopascals). The symbol of water potential is ψ.
How to find the Water Potential ?To find the water potential use this formula
[tex]\Psi = \Psi_{s} + \Psi_{p}[/tex]
where,
ψ = Water Potential
[tex]\Psi_{s}[/tex] = Solute Potential
[tex]\Psi_{p}[/tex] = Pressure potential
Now put the value in above expression we get
[tex]\Psi = \Psi_{s} + \Psi_{p}[/tex]
= -2.0 + 0.0
= - 2 bar
Thus from the above conclusion we can say that A plant cell has a solute potential of -2.0 bars and pressure potential of 0.0. Its water potential is -2 bar. The cell will gain water or swell.
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One of the product chemicals is aluminum chloride, which is an eye and skin irritant that can cause chemical burns. What will prevent you from coming into contact with this hazard
One of the product chemicals is aluminum chloride, which is an eye and skin irritant that can cause chemical burns. Wear safety glasses, Avoid contact with water or moisture and Avoid dust formation will prevent you from coming into contact with this hazard.
What is Aluminum Chloride ?Aluminum chloride is also called Aluminum trichloride. The formula of Aluminum chloride is AlCl₃. Aluminum chloride is a poor conductor of electricity in molten state. It is a powerful Lewis acid. It has very low melting point and boiling point.
What will prevent you from coming into contact with this hazard ?To prevent from this hazard follows these rules:
Wear safety glassesWear Impervious gloves Avoid contact with water or moisture. Avoid dust formationThus from the above conclusion we can say that One of the product chemicals is aluminum chloride, which is an eye and skin irritant that can cause chemical burns. Wear safety glasses, Avoid contact with water or moisture and Avoid dust formation will prevent you from coming into contact with this hazard.
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The density of ethanol, C2H5OH, is 0.789 g/mL. How many milliliters of ethanol are needed to produce 15.0 g of CO2 via a combustion reaction
The answer is 9.94 ml.
What is density?Density is a word we use to describe how much space an object or substance takes up (its volume) in relation to the amount of matter in that object or substance (its mass). Another way to put it is that density is the amount of mass per unit of volume. If an object is heavy and compact, it has a high density.Given,
The density of ethanol, C2H5OH = 0.789 g/mL
[tex]n (CO_{2} ) = \frac{m}{M} = \frac{15G}{44 g/mol} } = 0.341 mol;[/tex]
[tex]n ( C_{2} H_{2} OH) = \frac{n (CO_{2}) }{2} = \frac{0.341}{2} = 0.1705 mol;[/tex]
[tex]m (C_{2} H_{2} OH) = 0.1705 mol * 46 g/ mol[/tex] = 7.843 g
[tex]V (C_{2} H_{2} OH ) = \frac{7.843}{0.789} = 9.94 ml.[/tex]
Therefore, the answer is 9.94 ml
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The complete question is -
If the density of ethanol, C2H5OH, is 0.789 g/mL. How many milliliters of ethanol are needed to produce 15.0 g of CO2 according to the following chemical equation?
C2H5OH(l) + 3 O2(g) → 2 CO2(g) + 3 H2O(l)
If 5. 0 grams of kcl is dissolved in 500 ml of water, what is the concentration of the resulting solution?
If 5.0 grams of KCl is dissolved in 500 ml of water, the concentration of the resulting solution will be 0.134M.
How to calculate concentration?The concentration of a solution can be calculated by using the following formula;
Molarity = no of moles ÷ volume
According to this question, 5.0 grams of KCl is dissolved in 500 ml of water. The concentration is calculated as follows:
no of moles of KCl = 5g ÷ 74.5g/mol = 0.067mol
Molarity = 0.067mol ÷ 0.5L = 0.134M
Therefore, if 5.0 grams of KCl is dissolved in 500 ml of water, the concentration of the resulting solution will be 0.134M.
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According to the 2010 u.s. census, ______ percent of women had college degrees compared to approximately _____ percent of men.
According to the 2010 U.S. Census, 37 percent of women had college degrees compared to approximately 35 percent of men.
In 1970 and early 1980, women have surpassed men in number of bachelor's degree or master's degree in united state.
The women gets more degree to gain financial benefits. The gap in earning is greater in female graduate and non- graduate as compare to male graduate and non-graduate. To give education to girls saves lives and builds stronger families, communication and economic too.
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Need this answered ASAP
The concentration of the final solution will be 0.2886 M.
Molar concentration50.6 g of NaCl is dissolved in 600 mL of water.
Mole of 50.6 g NaCl = 50.6/58.44 = 0.8658 mol
Molar concentration of the oiriginal solution = 0.8658/06 = 1.4431 M
25 mL of 1.4431 M of the solution is diluted up to the 125 mL mark.
m1 = 1.4431, v1 = 25 ml, v2 = 125 mL
m2 = m1v1/v2 = 1.4431 x 25/125 = 0.2886 M
The concentration of the final solution will be 0.2886 M
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Calculate the molar mass of powdered fruit drink mix, made from sucrose (c12h22o11). appreciate it.
molar mass of sucrose is 342 g/mol.
Concept:
It is the substance's molecular mass. M is the abbreviation for it, and g/mol is the standard unit for measuring molar mass.
Given:
Sucrose (C12H22O11)
Find:
Calculate the molar mass of the powdered fruit drink mix, made from sucrose (C12H22O11).
Solution:
The molar mass of carbon = 12 g/mol
The molar mass of hydrogen = 1 g/mol
The molar mass of oxygen = 16 g/mol
Thus, the molar mass of sucrose can be calculated as:
C12H22O11 12 C + 22 H + 11 O
= 12 12 g/mol + 22 * 1 g/mol + 11 * 16 g/mol
= 144 g/mol + 22 g/mol + 176 g/mol = 342 g/mol
Therefore, the molar mass of sucrose is 342 g/mol.
Hence, the molar mass of the powdered fruit drink mix, made from sucrose
Hence, the molar mass of the powdered fruit drink mix, made from sucrose(C12H22O11) is 342 g/mol.
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Vapor pressure of a liquid increases with increasing temperature because increasing the temperature _______________.
Vapor pressure of a liquid increases with increasing temperature because increasing the temperature results in increasing kinetic energy and increase in molecular transition and motion.
What is Vapor Pressure?
The pressure exerted by a vapor in thermodynamic equilibrium with its condensed phases (solid or liquid) at a specific temperature in a closed system is referred to as vapor pressure.A liquid's evaporation rate can be determined by looking at the equilibrium vapor pressure. It has to do with how often particles tend to float away from liquids (or a solid).Volatile is a term used to describe a chemical that has a high vapor pressure at room temperature. Vapor pressure is the force that vapor exerts when it is present above a liquid surface.A liquid's molecules have an increasing kinetic energy as its temperature rises. The more molecules that convert into a vapor as a result of an increase in molecular kinetic energy, the higher the vapor pressure will be.Know more about vapor pressure https://brainly.com/question/14617982
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Write a balanced chemical equation for the reaction of solid vanadium(V) oxide with hydrogen gas to form solid vanadium(III) oxide and liquid water.
V₂O₅ (s) + 2H₂ (g) → V₂O₃ (s) + 2H₂O(l) is the balanced chemical equation for the reaction of solid vanadium(V) oxide with hydrogen gas to form solid vanadium(III) oxide and liquid water.
What is Balanced Chemical Equation ?The balanced chemical equation is the equation in which the number of atoms on the reactant side is equal to the number of atoms on the product side in an equation.
The word based equation is
Vanadium(V) oxide + Hydrogen gas → Vanadium (III) oxide + Water
Now write the chemical equation
V₂O₅ (s) + 2H₂ (g) → V₂O₃ (s) + 2H₂O(l)
Reactant side Product side
V = 2 V = 2
O = 5 O = 5
H = 4 H = 4
We can see that the number of atoms on reactant side is equal to the number of atoms on product side. So the given equation is balanced.
Thus from the above conclusion we can say that V₂O₅ (s) + 2H₂ (g) → V₂O₃ (s) + 2H₂O(l) is the balanced chemical equation for the reaction of solid vanadium(V) oxide with hydrogen gas to form solid vanadium(III) oxide and liquid water.
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PLEASE HELP!
You are preparing standard acid and base solutions for the laboratory, using potassium hydrogen phthalate (KHC₈H₄O₄, abbreviated KHP) as the primary standard. KHP (molar mass = 204.22 g/mol) has one acidic hydrogen. You prepared solutions of both NaOH and HCl. It took 22.65 mL of the NaOH solution to titrate (react exactly with) 1.55 g KHP. It then took 25.35 mL of HCl solution to titrate 25.00 mL of the NaOH solution. What is the molarity of the HCl solution?
Organic molecules (amino acids) needed to be concentrated to stimulate reactions to form proteins concentration mechanisms do not include:___.
Organic molecules (amino acids) needed to be concentrated to stimulate reactions to form protein concentration mechanisms that do not include Boiling.
Amino acids are natural compounds composed particularly of nitrogen, carbon, hydrogen, and oxygen. Your body desires 20 awesome amino acids to grow and function. amino acid, any of a group of organic molecules that consist of a basic amino group (―NH2), an acidic carboxyl group (―COOH).
fruits have an excessive content of amino acid that allows modify insulin degrees. fruits like bananas, apples, berries, and so forth., are rich resources of amino acids.
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These two images have different chemical change words and definitions,
Can someone please help me match the word from its meaning?
Thank you!
Answer:
(1) Acid -------------------------------------> (G) When dissolved in water, its solution has a pH value less than 7. Acids are proton (H⁺ ion) donors.
(2) Alkali -----------------------------------> (E) The oxide, hydroxide, or carbonate of a metal that will react with an acid, forming a salt as one of the products (if a base dissolves in water it is called an alkali. Bases are proton (H⁺ ion) acceptors.
(3) Base ------------------------------------> (I) Its solution has a pH value of more than 7.
(4) Blast furnace ------------------------> (C) The huge reaction vessels used in industry to extract iron from its ore.
(5) Displacement reaction ----------> (R) A reaction in which a more reactive element takes the place of a less reactive element in one of its compounds or in solution.
(6) Mole -----------------------------------> (A) A very large number that is the amount of substance in the relative atomic or formula mass of a substance.
(7) Neutral -------------------------------> (J) A solution with a pH value of 7 which is neither acidic nor alkaline. Alternatively, something that carries no overall charge.
(8) Neutralization ----------------------> (F) The chemical reaction of an acid with a base in which a salt and water are formed. If the base is a carbonate of hydrogen carbonate, carbon dioxide is also produced in the reaction.
(9) Ore -------------------------------------> (P) Ore is rock which contains enough metal to make it economically worthwhile to extract the metal.
(10) Oxidation --------------------------> (B) A reaction where oxygen is added to a substance / or when electrons are lost from a substance.
(11) pH -------------------------------------> (O) A number which shows how strongly acidic or alkaline a solution is.
(12) Pipette ------------------------------> (N) A glass tube used to measure accurate volumes of liquids.
(13) Precipitate -------------------------> (K) An insoluble solid formed by a reaction taking place in solution.
(14) Reactant ---------------------------> (M) A substance we start with before a chemical reaction takes place.
(15) Reduction -------------------------> (S) A reaction in which oxygen is removed or electrons are gained.
(16) Salt ----------------------------------> (Q) A salt is a compound formed when some or all of the hydrogen in an acid is replaced by a metal.
(17) Strong acids ---------------------> (L) These acids completely ionize in solution and have a high concentration of H⁺ (aq) ions in solution.
(18) Universal indicator ------------> (H) A mixture of indicators that can change through a range of colors to show how strongly acidic or alkaline liquids and solutions are.
(19) Weak acids ----------------------> (D) Acids that do not ionize completely in aqueous solutions.
A 17.10 g compound is made up of 5.900 g n and 11.20 g C. What is the percent composition of carbon in this compound?
A 17.10 g compound is made up of 5.900 g n and 11.20 g C. the percent composition of carbon in this compound is 65.5%
The ratio of the amounts of each element to the sum of the individual element amounts present in the compound, multiplied by 100, is the definition of the percent composition of a given compound. In this instance, the quantity is expressed in grams of the constituent ingredients.
You may calculate the mole: mole ratio of the components present in a compound by knowing the % composition of the compound. You can determine the ion ratio in a chemical once you have this information. Mass percent composition is also referred to as mass percent. It is denoted by the symbol w/w percent. Mass percent composition for a solution is equal to the mass of an element in one mole of the compound divided by the compound's molar mass, multiplied by 100%.
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Which molecule will undergo only london dispersion forces when interacting with other molecules of the same kind?.
Molecules undergo London dispersion forces:
[tex]C_{4}H_{10}[/tex] is the molecule will undergo only London dispersion forces when interacting with other molecules of the same kind.
What are London dispersion forces?
A sort of force that interacts between atoms and molecules that is often electrically symmetric is referred to as a London dispersion force.When viewed from the nucleus, their electron distribution is frequently symmetrical. This dispersion force, which is also known as a transient attractive force, is frequently observed when the locations of the electrons in two nearby atoms cause the atoms to temporarily form dipoles.The bond is polar when there are significant variations between the elements' electronegativities; it is nonpolar when there are similarities. When the molecule's dipole moment is equal to O, it is nonpolar; when it differs from O, it is polar.The force at these molecules is known as the London dispersion force. In nonpolar molecules, the forces are weak, and partial charges must be induced so that they can bond. In polar molecules, partial charges caused by polarity result in a stronger link known as a dipole-dipole. The dipole-dipole is significantly stronger and known as a hydrogen bond if it is connected to a large electronegative atom (F, O, or N). Ionic force is the name for the attraction force at ionic substances.The intermolecular force in the letter an is the London dispersion force because the compound is nonpolar;Reason for incorrect options:
b: the compound is ionic because Na is a metal and the other part is covalent,
c: two compounds are possible: one is nonpolar and exhibits London dispersion force; the other is polar and exhibits dipole-dipole force; and
d: both compounds exhibit hydrogen bonds (H bonded to O, and H bonded to F).
NOTE: Your question is incomplete, but most probably your full question was, which molecule will undergo only London dispersion forces when interacting with other molecules of the same kind? Which molecule will undergo only London dispersion forces when interacting with other molecules of the same kind?
A. [tex]C_{4}H_{10}[/tex]
B. [tex]NaC_{2}H_{3}O_{2}[/tex]
C. [tex]CH_{2}C_{12}[/tex]
D. [tex]C_{2}H_{5}OH HF[/tex]
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What type of molecule is shown below?
S
H-C=C-CH2-CH3
O A. An alkene-alkyne
OB. An alkane-alkyne
OC. An alkyne
O D. An alkane
H - C ≡ C - CH₂ - CH₃ this is an alkyne molecule.
Hence, Option C is correct answer.
What is Alkane ?The saturated hydrocarbon which have only single bonds between the carbon atoms is called Alkanes.
What is Alkene ?The unsaturated hydrocarbon which have at least one carbon carbon double bond is called Alkene.
What is Alkynes ?The unsaturated hydrocarbon which have one or more than one carbon carbon triple bonds is called Alkynes.
H - C ≡ C - CH₂ - CH₃ in this molecule one triple bond is present so it is alkyne.
Thus from the above conclusion we can say that H - C ≡ C - CH₂ - CH₃ this is an alkyne molecule.
Hence, Option C is correct answer.
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Which equation agrees with the ideal gas law?
StartFraction V subscript 1 over T subscript 1 EndFraction equals StartFraction V subscript 2 over T subscript 2 EndFraction.
V subscript 1 n subscript 1 equals V subscript 2 n subscript 2.
P subscript 1 n subscript 1 equals P subscript 2 n subscript 2.
StartFraction P subscript 1 over P subscript 2 EndFraction equals StartFraction T subscript 2 over T subscript 1.
The equation that agrees with the ideal gas law is as follows: StartFraction V subscript 1 over T subscript 1 EndFraction equals StartFraction V subscript 2 over T subscript 2 EndFraction (option A).
What is ideal gas law?Ideal gas law in physics is the equation of state of an ideal gas, which is a gas whose molecules do not interact or collide.
The equation of the ideal gas law is as follows:
PV = nRT
This equation shows that the volume is directly proportional to the volume of the gas.
Therefore, the equation that agrees with the ideal gas law is as follows: StartFraction V subscript 1 over T subscript 1 EndFraction equals StartFraction V subscript 2 over T subscript 2 EndFraction.
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option A, v1/t1 = v2/t2
A sample of 0.400 moles of nitrogen occupies 0.800 L. Under the same conditions, what number of moles occupies 1.200 L
Taking into account the Avogadro's Law, 0.600 moles occupies 1.200 L.
Avogadro's LawAvogadro's Law is a gas law that relates the volume and amount of gas at constant pressure and temperature.
Avogadro's law states that volume is directly proportional to the amount of gas: increasing the amount of gas will increase the volume, while decreasing the amount of gas will decrease the volume.
Mathematically, this law states that the ratio between the volume and the amount of gas is constant:
[tex]\frac{V}{n} =k[/tex]
Assuming that there is a certain amount of gas n1 that occupies a volume V1 at the beginning of the experiment, by varying the amount of gas to a new value n2, then the volume will change to V2, and the following is true:
[tex]\frac{V1}{n1} =\frac{V2}{n2}[/tex]
Amount of moles in this caseIn this case, you know:
V1=0.800 Ln1= 0.400 molesV2= 1.200 Ln2= ?Replacing in Avogadro's Law:
[tex]\frac{0.800 L}{0.400 moles} =\frac{1.200 L}{n2}[/tex]
Solving:
[tex]n2x\frac{0.800 L}{0.400 moles} =1.200 L[/tex]
[tex]n2=\frac{1.200 L}{\frac{0.800 L}{0.400 moles} }[/tex]
n2= 0.600 moles
Finally, 0.600 moles occupies 1.200 L.
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A saturated solution of baso4 has a concentration of 0.5mol/l. a 55ml sample is taken by you. what is the mass of baso4 in the solution
Answer:
6.4 g BaSO₄
Explanation:
You have been given the molarity and the volume of the solution. To find the mass of the solution, you need to (1) find the moles BaSO₄ (via the molarity ratio) and then (2) convert moles BaSO₄ to grams BaSO₄ (via the molar mass). It is important to arrange the conversions in a way that allows for the cancellation of units (the desired unit should be in the numerator). The final answer should have 2 sig figs to reflect the sig figs of the given values.
Molarity (mol/L) = moles / volume (L)
(Step 1)
55 mL / 1,000 = 0.055 L
Molarity = moles / volume <----- Molarity ratio
0.5 (mol/L) = moles / 0.055 L <----- Insert values
0.0275 = moles <----- Multiply both sides by 0.055
(Step 2)
Molar Mass (BaSO₄): 137.33 g/mol + 32.065 g/mol + 4(15.998 g/mol)
Molar Mass (BaSO₄): 233.387 g/mol
0.0275 moles BaSO₄ 233.387 g
--------------------------------- x ------------------- = 6.4 g BaSO₄
1 mole
Which of the following results in an increase in the entropy? (4 points)
Freezing water
Cooling a solid
Condensing water vapor
Dissolving sugar in water
Dissolving sugar in water results in an increase in the entropy.
Hence, Option (D) is correct answer.
What is Entropy ?Measurement of randomness of a system is called entropy. It is an extensive property. It is a state function. Unit of entropy is JK⁻¹ mol⁻¹.
Now lets check all options one by one
Option (A): Freezing water
Freezing water decreases the entropy because here second law of thermodynamics does not violate.
So it is incorrect option
Option (B): Cooling water
Cooling water does not increases entropy because entropy increases when solid melts to give liquid.
So it is incorrect option
Option (C): Condensing water vapour
In Condensing water vapour the temperature of liquid phase decreases and thus kinetic energy decreases. The randomness will decrease and hence entropy will also decrease.
So it is incorrect option.
Option (D): Dissolving sugar in solute
In dissolving sugar in solute the solid dissociates to ions and the randomness will increase and hence entropy will also increase.
So it is correct option
Thus from the above conclusion we can say that Dissolving sugar in water results in an increase in the entropy.
Hence, Option (D) is correct answer.
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1. Determine the amount concentration of calcium ions and acetate ions in a 0.80 mol/L
solution of calcium acetate (work out formula first).
Since there is one mole of Ca^2+ in calcium acetate, its concentration is 0.80 mol/L.
What is concentration?The term concentration has to do with the amount of substance in solution. The concentration can be measured in several units. Generally, concentration is expressed in molarity, molality, mass concentration units or percentage.
Now we are asked to find the amount concentration of calcium ions and acetate ions in a 0.80 mol/L solution of calcium acetate. The formula of calcium acetate is Ca(CH3COO)2.
Thus;
Ca(CH3COO)2(aq) ----> Ca^2+(aq) + 2CH3COO^-(aq)
It then follows that since there is one mole of Ca^2+ in calcium acetate, its concentration is 0.80 mol/L.
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What is the molality of a solution prepared by dissolving 2.00 ml of bromine (d = 3.105 g/ml) in 125 ml of acetic acid, hc2h3o2 (d = 1.05 g/ml) (ans. 0.30 m)?
The molality of a solution is 0.304g
Calculation,
Given data,
Volume of bromine = 2 mldensity of bromine = 3.105 g/ml Volume of acetic acid = 125 mldensity of of acetic acid = 1.05 g/mlDensity of bromine = 3.105 g/ml = mass / volume = mass / 2 ml
Mass of bromine = 3.105 g/ml × 2 ml = 6.206 g
Density of acetic acid = 1.05 g/ml = mass / volume = mass / 125 ml
Mass of bromine = 1.05 g/ml × 125 ml = 127.5 g
Molality = mass of solute in gram/molar mass of solute × 1000/mass of solvent in gram
Molality = 6.206 g/159.88 g/mol × 1000/127.5 g = 0.304 g
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Which diagram is the correct electron dot diagram for magnesium?
A.
A symbol of magnesium M g has four dots representing four free electrons.
B.
A symbol of magnesium M g has three dots representing three free electrons.
C.
A symbol of magnesium M g has one dot representing one free electron.
D.
A symbol of magnesium M g has two dots representing two free electrons.
Answer:
D.) A symbol of magnesium Mg has two dots representing two free electrons.
Explanation:
Magnesium is located in the second group (column) of the periodic table. Elements located here have 2 valence electrons in their outermost shell. Thus, the electron dot diagram of magnesium has 2 dots symbolizing the 2 valence electrons.