Answer:
The cations of the same charge increase in radius as you move down a column in the periodic table.
Explanation:
Moving down a column in the periodic table means to increase the main energy level and keeping the number of electrons in the outermost shell (the number of valence electrons).
The metals (elements in the left side of the periodic table) form positive ions, named cations, when they lose one or more valence electrons.
To depict this more clearly, consider, for example, the column 1 in the periodic table, which is the group of alkal metals: Li, Na, K, Rb, Cs, and Fr.
As you move down that column you ge the following results
Element Period Number of Main cation
(main energy level) valence electrons
Li 2 1 Li⁺
Na 3 1 Na⁺
K 4 1 K⁺
Rb 5 1 Rb⁺
Cs 6 1 Cs⁺
Fr 7 1 Fr⁺
Then, in the last column of the previous table, you see that all the cations have the same charge, because each one is formed after lossing the same number of electrons from the neutral atom (1).
Since, as you move down the column in the periodic table, the valence electrons are in higher main energy levels, which means that the size of both the neutral atom and the and the resultant cation formed after losing the valence electron are bigger than the cation of the previous level. Hence, as a general rule, the radius of the cations of the same charge increase as you move down a colum in the periodic table.
Cations of the same charge increase in radius as you move down a column in the periodic table due to the addition of electron shells, which results in a larger atomic radius for each successive element.
As you move down a column in the periodic table, cations of the same charge typically increase in radius. This trend is due to the addition of electron shells as you go from one period to the next. For example, considering the alkali metal group, a lithium cation (Li+) is smaller than a sodium cation (Na+), which in turn is smaller than a potassium cation (K+), and so on. Each atom down the group has an additional electron shell, which increases the distance between the nucleus and the outer electrons, resulting in a larger atomic radius, despite the positive charge remaining the same.
The increase in atomic radius as you move down a group is a predictable trend across the periodic table. This phenomenon is observed regardless of whether the element forms a cation or an anion, but the question specifically refers to cations. The trend is useful for predicting the physical and chemical properties of ions in various compounds.
when 0.863 mol acetone is dissolved in 500 g benzene, the freezing point of benzene drops 8.84°C. what is the molal freezing point depression constant (kf) for benzene?
Answer:
Kf = 5.12 °C/mExplanation:
1) Data:
a) Solute: acetone
b) Solvent: benzene
c) n (solute) = 0.863 mol
d) mass of solvent = 500 g = 0.500 Kg
e) ΔTf = 8.84 °C
f) Kf = ?
2) Formulae:
Depression of freezing point: ΔTf = m . KfMolality: m = n (solute) / kg solvent3) Solution:
a) m = 0.863 mol / 0.500 kg = 1.726 m
b) Kf = ΔTf / m = 8.84°C / 1.726 m = 5.12 °C/m ← answer
Element before carbon on the periodic table
Answer:Boron
Explanation:
it is element 5 represented by the letter B
Answer:
Boron.
Explanation:
Boron is fifth in the periodic table, and carbon is sixth. It goes: hydrogen, helium, lithium, beryllium, boron, carbon...
Which of the following is true about a carbonated soft drink?. . The carbon dioxide is the solvent, and water is the solute.. . The water is the solution, and carbon dioxide is the solvent.. . The carbon dioxide is the solution, and the water is the solvent.. . The water is the solvent, and the carbon dioxide is the solute.. . .
Answer:
The water is the solvent and the Carbon Dioxide is the Solute
Explanation:
The Carbon Dioxide is being dissolved into the Water. Solute is what is being dissolved, Solvent is what is doing the dissolving
Bromine occurs in the ____ state at room temperature.
a
gaseous
b
halogen
c
solid
d
liquid
e
plasma
Answer:
d liquid
Explanation:
Bromine occurs in the liquid state at room temperature.
Bromine is the only nonmetallic element that occurs in the liquid state at room temperature.
What is the mass of 2.00 l of an intravenous glucose solution with a density of 1.15 g/ml?
Answer: The mass of intravenous glucose solution is 2300 g
Explanation:
To calculate the mass of solution, we use the equation:
[tex]\text{Density of substance}=\frac{\text{Mass of substance}}{\text{Volume of substance}}[/tex]
Volume of glucose solution = 2.00 L = 2000 mL (Conversion factor: 1 L = 1000 mL)
Density of glucose solution = 1.15 g/mL
Putting values in above equation, we get:
[tex]1.15g/mL=\frac{\text{Mass of glucose solution}}{2000mL}\\\\\text{Mass of glucose solution}=2300g[/tex]
Hence, the mass of intravenous glucose solution is 2300 g
Which of the following is in the lanthanide family?
A) Uranium
B) Promethium
C) Silver
D) Gold
Answer:
It is Promethium
Explanation:
Because they are chemical elements with atomic numbers 57 through 71
Answer:
The answer is B) Promethium
Explanation:
The Promethium is a chemical element of the periodic table whose symbol is Pm and its atomic number is 61 and is part of the group of lanthanide elements.
Lanthanides are a group of elements that are part of period 6 of the periodic table of the elements whose name comes from the chemical element lanthanum, which is included within this group, giving a total of 15 elements, from the element of atomic number 57 (lanthanum) to 71 (lutetium)
A solution contains 15 ppm of benzene. The density of the solution is 1.00 g/mL. This means that ________.
the solution is 15% by mass of benzene
1.0 g of the solution contains 15 * 10^-6 g of benzene
there are 15 mg of benzene in 1.0 g of this solution
100 g of the solution contains 15 g of benzene
1.0 L of the solution contains 15 g of benzene
Answer:
second choice: 1.0 g of the solution contains 15 × 10⁻⁶ g of benzene.Explanation:
ppm is a unit of concentration that means parts per million. In grams that is grams of solute per one million (10⁶) grams of solution.
Then, 15 ppm of benzene means that there are 15 grams of benzen in 1,000,000 grams of solution.
That leads to:
1,000,000 g solution / 15 g benzeneMultiplying numerator and denominator by 10⁻⁶ you find:
1,000,000 × 10⁻⁶ g solution / (15 × 10⁻⁶ g benzene)Simplifying:
1.0 g solution / (15 × 10⁻⁶ g benzene)Which is read as 1.0 g of the solution contains 15 × 10⁻⁶ g of benzene, i.e. the second answer choice.
Answer:
1.0 g of the solution contains 15 * 10^-6 g of benzene
Explanation:
ppm by definition is parts per million. In this context, that means there are 15 g of benzene in 1,000,000 mL of solution.
We are given a solution with a density of 1.00 g/mL meaning there is just 1 mL
So, because there is only 1 mL instead of 1,000,000 mL, we will have 15 x 10^-6 g of benzene present in 1 g of the solution.
What is the atomic number of an atom that has 6 protons
Answer:
Its atomic mass is 14 ( = 6 protons + 8 neutrons). In chemistry, the number of protons in an atom is more important than the number of neutrons. Scientists call the number of protons the "atomic number"
Explanation:
Two containers hold the same radioactive isotope. Container A contains 1000 atoms, and container B contains 500 atoms. Which of the following statements about containers A and B is true? Two containers hold the same radioactive isotope. Container A contains 1000 atoms, and container B contains 500 atoms. Which of the following statements about containers A and B is true? The rate of decay of atoms (half-life) in container A is greater (or longer) than the rate of decay of atoms (half-life) in container B. The rate of decay of atoms (half-life) in container B is greater (or longer) than the rate of decay of atoms (half-life) in container A. The rate of decay of atoms (half-life) in container B is the same as the rate of decay of atoms (half-life) in container A.
Answer:
B
Explanation:
This is due to the differences in the concentrations of the radioactive isotopes in the two containers of the same volume. In container A, with a higher density of atoms, there is a higher chance of a neutron released in the decay of one atom, hitting another atom and splitting it. This is in comparison to container B that has fewer atoms that are widely dispersed due to the lower density. Atoms in cointainer A will therefore decay faster (shorter half-life) than atoms in container B.
Answer:
b
Explanation:
Which of the following variables is not considered to be a fundamental way of changing the rate of a chemical reaction?
a. Temperature
b. Surface Area
c. Concentration
d. Catalyst
e. Time
Quite certain the answer is Time but I need a second opinion.
Answer:
Yeah, same i believe it's Time.
Explanation:
Hope my answer has helped you!
Answer:
e. Time
Explanation:
That is correct.. All the others may be active in affecting the rate of a reaction.
Gallium has two naturally occurring isotopes. One of them, gallium-69, has a mass of 68.925581 u and a percent isotopic abundance of 60.11%. What must be the mass and percent isotopic abundance of the other isotope, gallium-71?
Answer:
1) The percent isotopic abundance of Ga-71 = 39.89%.
2) The mass of Ga-71 = 70.294625 u.
Explanation:
1) The percent isotopic abundance of Ga-71:
The total sum of different isotopes = 100%.
∴ The abundance percent of Ga-69 + the abundance percent of Ga-71 = 100%.
∴ The abundance percent of Ga-71 = 100% - The abundance percent of Ga-69 = 100% - 60. 11% = 39.89%.
2) The mass of Ga-71:
∵ The amu of the mixture = (amu of Ga-69)(fraction of isotope Ga-69) + (amu of Ga-71)(fraction of isotope Ga-71).
The amu of the mixture = 69.723 u,
amu of Ga-69 = 68.925581 u, fraction of isotope Ga-69 = (abundance of Ga-69)/100 = (60.11%)/100 = 0.6011,
amu of Ga-71 = ??? u, fraction of isotope Ga-71= (abundance of Ga-69)/100 = (39.89%)/100 = 0.3989.
∴ 69.723 u = (68.925581 u)(0.6011) + (amu of Ga-71)(0.3989).
∴ (amu of Ga-71)(0.3989) = (69.723 u)(68.925581 u)(0.6011) = 28.29 u.
∴ (amu of Ga-71) = (28.29 u)/(0.3989) = 70.294625 u.
A man heats a balloon in the oven. If the balloon initially has a volume of 2.0 L and a temperature of 293K, what will the final temperature of the balloon be after he heats it and has a final volume of 10.0L?
Answer:1465k
Explanation:Find explanation in the attachment
Answer:
The correct answer is 1465K
Explanation:
The formula to be used here is that of Charles' law.
Charles' law states that the volume of an ideal gas is directly proportional to its absolute temperature (in kelvin), provided that pressure remains constant. From the law above we can deduce the formula below
V₁/T₁ = V₂/T₂
where V₁ is the initial volume (2.0 L)
T₁ is the initial temperature (293K)
V₂ is the final temperature (10.0L)
T₂ is the final temperature (unknown)
From the formula, it can be deduced that
T₂ = (T₁ × V₂) ÷ V₁
T₂ = (293 × 10) ÷ 2
T₂ = 1465K
The final temperature of the balloon after heating will be 1465K
PLEASE HELP THANKS
A student performs an exothermic reaction in a beaker and measures the temperature. If the thermometer initially reads 35 degrees Celsius, what is a possible reading of the thermometer after the reaction?
A. 45 degrees Celsius B. 0 degrees Celsius C. 35 degrees Celsius D. 25 degrees Celsius
Answer:
i think 35 degrees Celsius
Explanation:
cause its the same temperature
Answer:
The answer is: A. 45 degrees Celsius
Explanation:
Answer:
In order to solve this problem, you need to know that an exothermic reaction is a chemical reaction that releases energy through light or heat to the environment, in the other hand, an endothermic reaction is a chemical reaction that absorbs heat from its environment.
In the problem says that an exothermic reaction is performed at a temperature of 35 degrees Celsius.
Now, keeping in mind that a exothermic reaction release heat, we can affirm that the temperature of the sistem will by increased after the reaction occurs.
Finally, the only possible answer is A, because is the only temperature which is superior to the initial temperature (35 degrees Celsius)
calculate the speed of an electron if its de broglie wavelength is twice its displacement in one second
Answer:
The speed of an electron is 0.01908 m/s.
Explanation:
De-Broglie wavelength is given by:
[tex]\lambda=\frac{h}{mv}[/tex]
where, [tex]\lambda[/tex] = wavelength of a particle
h = Planck's constant = [tex]6.626\times 10^{-34}Js[/tex]
m = mass of particle
v = velocity of the particle
Velocity of an electron = v
Mass of an electron = [tex]9.1\times 10^{-31}kg[/tex]
Wavelength of electron is twice the displacement in seconds which is velocity of an electron.
Then.wavelength of an electron = [tex]\lambda =2v[/tex]
[tex]\lambda =2v=\frac{6.626\times 10^{-34}Js}{9.1\times 10^{-31}kg\times v}[/tex]
v = 0.01908 m/s
The speed of an electron is 0.01908 m/s.
In quantum physics, the de Broglie wavelength exhibits the wave-particle duality of matter, presenting that particles like electrons have wave characteristics. If an electron's de Broglie wavelength is twice its displacement per second, it suggests the electron's velocity equals the de Broglie wavelength divided by twice the time.
Explanation:The subject of the question pertains to de Broglie wavelength which is a fundamental concept in quantum physics. The de Broglie wavelength is named after Louis de Broglie and it describes the wave-particle duality of matter, suggesting that particles such as electrons have characteristics of both particles and waves.
If the de Broglie wavelength of an electron is twice its displacement in one second, this implies that the electron's velocity, is equal to the de Broglie wavelength of the electron divided by double the time (which is 1 second in this case).
It is important to understand that the de Broglie wavelength is not a physical wavelength but rather a mathematical construct that helps us understand the behavior of particles in a more intuitive way than through purely using the equations of quantum mechanics.
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One-twelfth the mass of a carbon atom having six protons and six neutrons
Answer:
Is one unified atomic mass unit (u)
Explanation:
It is NOT an atomic mass unit (amu). That unit is obsolete. It was based on oxygen and was replaced in 1961.
Which of these describes the rate of this chemical reaction?
H2 + Cl2 → 2 HCl
a. an increase in the concentration of HCl and H2 with time
b. an increase in the concentration of HCl with time
c. an increase in H2 and Cl2 with time
d. a decrease in HCl and Cl2 with time
Answer:
b.an increase in concentration of HCl with time.
Explanation:
The measurement of reaction rate is simply based on the dissapearance of a reactant or appearance of a product with increasing reaction time.
For this kind of chemical reaction, the rate would increase if the concentration of the reactants increase.
The reactants are made up of gaseous particles, for gases reacting, the rate of the reaction is directly proportional to concentration. The concentration of a gaseous system is also directly proportional to the pressure and we can use pressure in place of concentration.
For this reaction, we don't know the order of reaction of the reactants. This would not make the gaseous reactants suitable to monitor the rate of the reaction.
Since it is only the appearance of the product we are sure of, we simply monitor the concentration of the product to determine the rate.
The correct answer is option b) an increase in the concentration of HCl with time. The rate of the reaction [tex]H_2 + Cl_2 \rightarrow 2HCl[/tex] as HCl is the product and its concentration increases over time.
The reaction given is [tex]H_2 + Cl_2 \rightarrow 2HCl[/tex].
We need to determine which option correctly describes the rate of this reaction. Considering the options:
An increase in the concentration of HCl and H₂ with time.
This option is incorrect because H₂ is a reactant and its concentration should decrease over time.An increase in the concentration of HCl with time.
This option is correct as HCl is the product, and its concentration will increase over time as the reaction proceeds.An increase in H₂ and Cl₂ with time.
This option is incorrect because both H2 and Cl2 are reactants and their concentrations should decrease over time.A decrease in HCl and Cl₂ with time.
This option is incorrect because HCl is the product, and its concentration should increase.Therefore, the correct answer is option b.
An example of something that stores chemical energy is
Hello There!
Chemical energy is energy that is stored in the bonds and atoms of molecules.
A battery is an example of an item that stores atoms and molecules in the bonds.
Gasoline and organic molecules like sugars and fats are examples of things that store chemical energy. This energy can be transformed during combustion in cars or through metabolic processes in living cells into usable forms of kinetic or ATP energy.
Explanation:An example of something that stores chemical energy is gasoline, which stores energy in the bonds of its molecules. This chemical energy is released as heat during combustion in a car engine, converging into kinetic (mechanical) energy that moves the car.
Another scenario is found within our bodies. Organic molecules such as sugars and fats also store chemical energy. Your cells evolve to convert this chemical energy through a series of chemical reactions into a usable form of energy stored in molecules of ATP (Adenosine Triphosphate), an energy-carrying molecule found in the cells of all living things. This energy is easily accessible to do work such as muscle contraction, transport materials, power the motion of cilia or flagella, etc.
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The nuclide As-76 has a half-life of 26.0 hours. If a sample of As-76 weighs 344 g, what mass of As-76 remains after 538 minutes? A) 67.8 g B) 271 g C) 144 g D) 437 g E) 251 g 26.
Answer:
B) 271 g.
Explanation:
It is known that the decay of a radioactive isotope isotope obeys first order kinetics.Half-life time is the time needed for the reactants to be in its half concentration.If reactant has initial concentration [A₀], after half-life time its concentration will be ([A₀]/2).Also, it is clear that in first order decay the half-life time is independent of the initial concentration.The half-life of As-76 = 26.0 hours.For, first order reactions:
k = ln(2)/(t1/2) = 0.693/(t1/2).
Where, k is the rate constant of the reaction.
t1/2 is the half-life of the reaction.
∴ k =0.693/(t1/2) = 0.693/(26.0 hours) = 0.02665 hour⁻¹.
Also, we have the integral law of first order reaction:kt = ln([A₀]/[A]),
where, k is the rate constant of the reaction (k = 0.02665 hour⁻¹).
t is the time of the reaction (t = 538 min = 8.97 hour).
[A₀] is the initial concentration of (As-76) ([A₀] = 344 g).
[A] is the remaining concentration of (As-76) ([A] = ??? g).
∴ (0.02665 hour⁻¹)(8.97 hour) = ln((344 g)/[A])
∴ 0.239 = ln((344 g)/[A]).
Taking exponential for both sides:∴ 1.27 = ((344 g)/[A]).
∴ [A] = (344 g)/(1.27) = 270.88 g ≅ 271 g.
So, the right choice is: B) 271 g.In order for a high temperature boiler or steam engine to produce superheated water, or steam: the heat source must be greater than 100°C the water must be permitted to evaporate quickly the system must be sealed and become pressurized above atmospheric pressure the vapor pressure must be kept below 760 mm(Hg)
To produce superheated steam, the heat source must exceed 100°C, and the system must be sealed to allow pressure buildup. This increased pressure raises the boiling point, permitting the water to absorb more heat, making the steam superheated.
In high temperature boilers or steam engines, such as those found in steam locomotives or industrial reactors, to produce superheated steam, several conditions have to be met. One key factor is that the heat source must be greater than 100°C, as it's necessary to not just boil the water but also to add extra energy to the steam to make it superheated. Moreover, the system must allow the water to evaporate, but not quickly .
To produce super heated steam, a high-temperature boiler or steam engine must maintain a sealed and pressurized system above atmospheric pressure, which allows the boiling point to increase and produce steam at higher temperatures, such as in steam locomotives and pressurized reactors.
In the context of steam generation and boilers, several factors are key to producing super heated steam. Based on the information provided, the system must be sealed and become pressurized above atmospheric pressure, is correct.
Raising the pressure of the steam increases the boiling point of water, thus, a steam engine or a high-temperature boiler would need to have a sealed system to maintain the pressurization necessary to produce super heated steam. For instance, at a pressure of 150 pounds or more per square inch, which is common in locomotives, the water and steam's temperature can reach 360°C or higher.
This principle is analogous to the increased boiling point experienced in pressurized water reactors, where water can remain liquid at temperatures significantly above 100°C. When steam does work in an engine or a turbine, it condenses and loses some temperature. High efficiency is desirable for steam engines, and it's achieved through operating at higher temperatures and pressures, which increases the proportion of the heat units utilized for work.
When solutions of silver nitrate and magnesium chloride are mixed, silver chloride precipitates out of solution according to the equation 2AgNO3(aq)+MgCl2(aq)→2AgCl(s)+Mg(NO3)2(aq) What mass of silver chloride can be produced from 1.50 L of a 0.118 M solution of silver nitrate?
What type of organic molecule comprises the majority of a potato?
A sample of 1.55 g of iron ore is dissolved in an acid solution in which the iron is converted into
Fe2+. The solution formed is then titrated with KMnO4 which oxidises Fe2+ to Fe3+ while the MnO4-
ions are reduced to Mn2+ ions. 92.95 mL of 0.020 M KMnO4 is required for the titration to reach
the equivalence point.
a) Write the balanced equation for the titration.
b) Calculate the percentage of iron in the sample.
Answer:a) 8H2SO4 + 2KMnO4 + 10FeSO4 → 5Fe2(SO4)3 + 8H2O + 2MnSO4 + K2SO4
B) nKMno4 = 0.001859 mol
=>nFeso4=0.009295 mol
nFe= 0.009295 mol
mFe=0.52052 g
=>percentage of iron in the sample: 33.5819%
Explanation:a) 8H2SO4 + 2KMnO4 + 10FeSO4 → 5Fe2(SO4)3 + 8H2O + 2MnSO4 + K2SO4
B) nKMno4 = 0.001859 mol
=>nFeso4=0.009295 mol
nFe= 0.009295 mol
mFe=0.52052 g
The reaction is a redox reaction.
The percentage of Fe^2+ is 34.3%
The balanced overall redox reaction equation is:
[tex]MnO4^- + 8H^+ + 5Fe^2+ ----> Mn^2+ + 4H2O + 5Fe^3+[/tex]
Number of moles of permanganate = 0.020 M * 92.95/1000 L = 0.0019 moles
From the reaction equation:
5 moles of [tex]Fe^2+[/tex]reacts with 1 mole of permanganate
x moles of [tex]Fe^2+[/tex] reacts with 0.0019 moles of permanganate
x = 5 * 0.0019 /1 = 0.0095 moles of [tex]Fe^2+[/tex]
Mass of [tex]Fe^2+[/tex] = 0.0095 moles of [tex]Fe^2+[/tex] * 56 g/mol = 0.532 g
Percentage of iron = 0.532 g/1.55 g * 100 = 34.3%
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Which is an important indigestible carbohydrate in the diet?
a. amylose
b. cellulose
c. glycogen
d. glucose
Answer:
b. cellulose
Explanation:
It is important fro the smooth function of the digestive tract.
Cellulose is an important indigestible carbohydrate in the diet. Option b is correct.
It is a complex polysaccharide composed of repeating units of glucose molecules linked together by β-1,4-glycosidic bonds. Cellulose is the main structural component of the cell walls of plants and is found in abundance in fruits, vegetables, grains, and other plant-based foods.
Unlike other carbohydrates like amylose (a type of starch) or glycogen (a storage form of glucose in animals), cellulose cannot be broken down by the digestive enzymes produced by humans and most animals. This is because mammals lack the necessary enzyme, cellulase, required to hydrolyze the β-1,4-glycosidic bonds in cellulose.
Although cellulose is indigestible by humans, it plays a crucial role in the diet. It provides dietary fiber, which is essential for maintaining a healthy digestive system. Dietary fiber adds bulk to the stool, helps regulate bowel movements, and promotes the growth of beneficial gut bacteria. Additionally, consuming foods rich in cellulose can aid in satiety and weight management since it takes longer to chew and provides a feeling of fullness.
In summary, cellulose is an important indigestible carbohydrate in the diet, providing valuable dietary fiber and promoting digestive health. While humans cannot digest cellulose directly, its presence in plant-based foods is essential for maintaining a balanced and healthy diet.
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What is the pH of a 0.0010 M HNO3?
1.0
3.0
4.0
5.0
Answer:
Ph= 3
Explanation:
-Log(0.0010)=3
In a chemical reaction, the final amount of the products is determined by the _______.
A. Universal Gas Law
B. Law of Definite Proportions
C. air pressure
D. temperature
E. None of the Above
Please help me
Answer: I believe it is B
Explanation:
because it states that a chemical compound always contains exactly the same proportion of elements by mass
Which of the following represent impossible combinations of n and I? (a) 1p, (b) 4s, (c) 5f, (d) 2d 6.61
Answer:
Options (a) and (d) : (a) 1p and (d) 2d represent impossible combinations of n and l.Explanation:
n refers to the principal quantum number, and l refers to the angular momentum or Azimuthal quantum number.
Principal quantum number (n) is used to indicate the main energy level of the electron. It may take whole numbers: 1, 2, 3, 4, 5, 6, 7, ...
Angular momentum or Azimuthal quantum number refers to the kind (shape) of the orbital. It can take numbers from 0 to n - 1.
So, if n = 1, l can only be 0; if n = 2, l can be either 0 or 1; if n = 2, l can be either 0, 1 or 2.
On the other hand, the shape of the orbitals is also representd by a letter. then there is a unique relation between the letter that represents the orbital and the angular quantum number which is:
letter l number
s 0
p 1
d 2
f 3
The previous information is summarized in the next table:
n possible l numbers
1 0
2 0, 1
3 0, 1, 2
4 0, 1, 2, 3
5 0, 1, 2, 3, 4
6 0, 1, 2, 3, 4, 5
7 0, 1, 2, 3, 4, 5, 6
As per the choices given in the question you have:
(a) 1 p is not possible because when n = 1 the only l number is 0 and it is an s orbital, but p ⇒ l = 1. Thus, this is a correct choice.
(b) 4s is possible since n = 4 permits l to be 0, 1, 2, and 3.
(c) 5f is possible since n = 5 permits l to be 0, 1, 2, 3, and 4.
(d) 2d is impossible since n = 2 permits l to be 0, and 1, but d ⇒ l = 2. Thus, this is other right choice.
The impossible combinations of n and I are 1p and 2d.
Quantum numbers describe the position of an electron in an atom. Four sets of quantum numbers are important when discussing electrons in atoms. These quantum numbers are;
Principal quantum number (n) taking values from 0 to infinityorbital quantum number(l) taking values from 0 to (n - 1)magnetic quantum number(ml) taking values from +l to -lSpin quantum number(ms) taking values of ±1/2.Given the conditions, combinations of n and I where n = l are not allowed. Recall that s p d f corresponds to 0 1 2 3. As such, 1p and 2d are not allowed.
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How many moles are equivalent to 3.58x1023 formula units of ZnCl2? a. 0.555 mol ZnCl2 c. 0.621 mol ZnCl2 b. 1 mol ZnCl2 d. 0.595 mol ZnCl2
Answer:
There are approximately d. 0.595 mol of ZnCl₂ in 3.58×10²³ formula units.
Explanation:
Consider the Avogadro's Constant [tex]N_A[/tex] or equivalently, [tex]L[/tex]:
[tex]N_A \approx \rm 6.02\times 10^{23}\;mol^{-1}[/tex].
In other words, there are [tex]\rm 6.02\times 10^{23}\;mol^{-1}[/tex] constituent particles (Wikipedia) in each mole of a substance. In this case,
Zinc chloride [tex]\rm ZnCl_2[/tex] is the substance, and[tex]\rm ZnCl_2[/tex] formula units are the constituents.[tex]N = 3.58\times 10^{23}[/tex].
[tex]\displaystyle n = \frac{N}{N_A} =\rm \frac{3.58\times 10^{23}}{6.02\times 10^{23}\;mol^{-1}} = 0.595\;mol[/tex].
How does the pressure exerted by a liquid change with depth of the liquid? How does the pressure exerted by a liquid change as the density of the liquid changes?
proportional to depth; constant as density changes
proportional to depth; proportional to density
proportional to depth; inversely proportional to density
inversely proportional to depth; proportional to density
Answer:
second option: proportional to depth; proportional to densityExplanation:
The pressure exerted by a liquid is equal to the pressure inside the liquid. This pressure is called hydrostatic pressure.
The equation to calculate the pressure inside a liquid (a fluid in general) is found by applying balance of forces inside a portion of liquid.
The equilibrium condition (net force = 0) and the definition of pressure (P = F/A) leads to:
P = p⁰ + ρ . g . Δh, or ΔP = ρ . g . ΔhWhere, P is the pressure exerted by the liquid, p⁰ is the atmospheric pressure, ΔP is the difference in the pressure, ρ is the density of the liquid, g is the acceleration of gravity, and Δh is the change with depth.
Hence, the pressure exerted by a liquid varies jointly with the density of the liquid and the depth, meaning that it is proportional to the product of them both.
Therefore, the choice that represents this conditon is the second one: the pressure exerted by a liquid changes proportional to the depth and proportional to the density changes.
The pressure exerted by a liquid is proportional to the depth of the liquid and also proportional to the density of the liquid.
Explanation:The pressure exerted by a liquid changes with depth and density in a predictable way. As you go deeper into a liquid, the pressure increases because there is more liquid above you exerting force due to gravity. This relationship is proportional to depth; specifically, pressure due to the weight of a liquid of constant density is given by the formula p = ρ gh, where p is the pressure, h is the depth of the liquid, ρ (rho) is the density of the liquid, and g is the acceleration due to gravity.
Similarly, the pressure exerted by a liquid also changes as the density of the liquid changes. If the density of the liquid increases, the pressure at a particular depth also increases. Thus, this relationship is proportional to density. Traveling up into the atmosphere demonstrates the effect density has on pressure because the density of the air begins to decrease with height, unlike in liquids where the density is often constant.
In summary, the pressure exerted by a liquid is proportional to both the depth and the density of the liquid. Therefore, the correct description of how pressure changes in a liquid is: proportional to depth; proportional to density.
On the atomic level energy and matter exhibit the characteristics of
Answer:
On the atomic level, energy and matter exhibit the characteristics of both waves and particles.Explanation:
The dual behavior of subatomic particles as waves and particles is known as the wave - particle duality.
And this principle is the basis of the quantum theory.
Such principle is widely applied to the electrons; i.e., the electrons posses wave and particle propeties, which must be understodd as that some of their properties may be explained as if they were particles and others as if they were waves.
For example, from the particle point of view electrons have mass. You can find in internet that the mass of one electron is about 9.1093837015×10⁻³¹ kg or about 1/1836 times the mass of one proton.)
Since, the point of view of the wave characteristics, electrons have wavelength, Louis de Broglie deduced the equation that relates the wavelength and the mass, through this realtion:
Wavelength (λ) = Planck’s constant (h) divided by the product of the mass (m) and the the speed (v) of the particle.λ = h / mv
Find the enthalpy of neutralization of HCl and NaOH. 87 cm3 of 1.6 mol dm-3 hydrochloric acid was neutralized by 87 cm3 of 1.6 mol dm-3 NaOH. The temperature rose from 298 K to 317.4 K. The specific heat capacity is the same as water, 4.18 J/K g.
A. -101.37 kJ
B. 7055 kJ
C. 10,1365 kJ
Answer:
The correct answer is A : -101.37 KJ
Explanation:
Specific heat, s = 4.18 J/Kg
Density of water is 1g/cm3 , so 174 cm3 of total solution is = 174 g
Total mass of reaction mixture is = 174 g
Rise in tempetrature, ΔT = 317.4 K -298 K = 19.4 K
87 cm3 of 1.6 mol dm-3 of HCl = 87 cm3 of 1.6 mol dm-3 NaOH
1.6 M solution means that 1000 cm3 of solution has 1.6 moles.
So, 87 cm3 of 1.6 M solutions = 0.1392 M of HCl and NaOH
Heat evolved (q) = m x s x ΔT
= 174 g x 4.18 J/Kg X 19.4 K
=14110.0 J = 14.110 KJ (for exothermirmic reaction -14.110 KJ )
Enthalpy of neutralization = -14.110 KJ/ 0.1392 = - 101.37 KJ
Answer:
A.) -101.37 kJ
Explanation:
I got it correct on founders edtell