From the periodic trends, one atom in the same group which is larger than a sulfur atom is selenium, and one which is smaller is oxygen.
From Coulomb's Law, the size of an atom decreases with an increase in the force of attraction and decreases with an increase in the forces of repulsion.
What group does sulfur belong to in the periodic table of elements?Sulfur belongs to group 6A or 16 of the periodic table.
Elements in group 6A have six electrons in their valence shells.
The valency of elements in group 6a of the period table is usually 2, 4 or 6.
Based on the periodic trends, the atomic size of elements in group 6A increases on going down the group due to an extra electron shell added to the atoms of the elements.
The other elements in group 6A are oxygen, selenium, and tellurium. etc.
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The earth’s magnetic poles are in the general direction of the planet’s geographic poles. However, unlike the geographic poles, the magnetic poles are not always in the same place.
As used in the text, what does the phrase "general direction" mean?
(A) different but the same exact way
(B) similar but complete opposite way
(C) similar but not the same exact way
(D) different and complete opposite way
The earth’s magnetic poles are in the general direction of the planet’s geographic poles. the phrase "general direction" mean different and complete opposite way.
What is difference between magnetic pole and geographic pole ?A bar magnet that is suspended freely will always point north-south. This is a result of the bar magnet's south pole being drawn to the Earth's magnetic north pole (geographic south).
Geographic and magnetic poles on Earth are generated by various sources, thus they are not perfectly aligned. The outer core's swirling currents of liquid iron are what generate the Earth's magnetic field.
Thus, Option D is correct.
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what is the solubility of ca(oh)2 (s) in water, given that the ksp is 6.5 x 10-6. molar mass of ca(oh)2 is 74.09 g/mol. g
8.7M Is the solubility of Ca(oh)2 in water at a given Ksp of 6.5 .10-6 and molar mass of 74.09g/mol.
Solubility is defined as the amount of the substance dissolved in a given amount of solvent at a certain temperature.
Ca(OH)2 à Ca2+ + 2OH-
Ksp = 6.5 .10-6
Molar mass= 74.09 g/mol
Ksp is solubility product constant which describes the equilibrium between a solid and its ion in solution.
Ksp=[Ca2+] [OH2-]
6.5 .10-6 = S. (74.09g/mol +S)
6.5 .10-6 = S .( 74.09M)
S = 6.5 .10-6 /74.09 M
= 8.7 M
So, the solubility of Ca(OH)2 is 8.7M.
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three atoms have the following ground state electron configurations. which statement regarding the atoms is true? atom 1: 1s22s22p63s23p2 atom 2: 1s22s22p63s23p5 atom 3: 1s22s22p63s23p64s1 group of answer choices g
Answer:
atom1:1s22s22p63s23p2
how does the standard entropy of a substance depend on its molar mass? the larger the molar mass, the lower the entropy. the standard entropy of a substance does not depend on its molar mass. the larger the molar mass, the greater the entropy.
The bigger the molar mass, the greater the entropy at room temperature. When looking at the state of matter of objects, entropy generally increases with increasing molecular complexity.
What is entropy ?
Entropy, a measure of a system's thermal energy per unit temperature not available for useful work. Work is obtained from ordered molecular motion, the amount of entropy is also a measure of the molecular disorder or randomness of a system. The concept of entropy gives us deep insight into the direction of spontaneous change in many everyday phenomena. Introduced in 1850 by German physicist Rudolf Clausius, it is the pinnacle of 19th-century physics.
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Choose the nonmetallic elements from the list. Check all that apply.
Oyttrium
oxygen
boron
Opolonium
argon
gallium
carbon
what volume in gas would be produced by the complete reaction of solid at stp according to the following reaction?remember mol of an ideal gas has a volume of lat stp.
3.648 liters of volume in gas would be produced by the complete reaction of solid at STP according to the reaction as 1 mole of an ideal gas has a volume of 22.4 L at STP.
How is the volume in gas calculated?The given reaction is
[tex]2 Al(s) + 6 HCl (aq)[/tex] = [tex]2AlCl[/tex]₃([tex]aq[/tex])[tex]+H[/tex]₂([tex]g[/tex])
1mole of ideal gas is 22.4L
Here we have to convert the mass of Al to moles.
We know, Number of moles = Mass/Molar mass
Mass of Al = 2.93 g
Molar mass of Al = 26.98 g
Therefore, No. of moles = 2.93 g/26.98 g = 0.108 moles
The molar ratio of Al to H₂ is 2:3
As, 2 moles of Al can produce 3 moles of H₂
Then, 0.108 moles of Al can produce
(0.108 × 3)/ 2
= 0.163 moles of H₂
Now by applying the Ideal Gases Law to calculate the volume that is been produced throughout the reaction at STP ,
The standard temperature is 273 K (0° Celsius or 32° Fahrenheit) and the standard pressure is 1 atmosphere.
1 atm × V = 0.163 mol × 0.082L.atm(mol.K)⁻¹ × 273K
Hence,
V = (0.163 mol × 0.082 L.atm(mol.K)⁻¹ × 273K) / 1atm
V = 0.013366 × 273
Therefore, the Volume is 3.648 L
What is STP?In chemistry, STP stands for Standard Temperature and Pressure. STP is most commonly used when doing gas calculations. B. Gas Density. The standard temperature is 273 K (0° Celsius or 32° Fahrenheit) and the standard pressure is 1 atmosphere. This is the freezing point of pure water at atmospheric pressure at sea level.
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(1) what is the element with an electron configuration of 1s22s22p63s23p64s23d1? fill in the blank 1 (2) what is the element with an electron configuration of 1s22s22p3?
The first element whose atomic number is 21 is Scandium and the second element whose atomic number is 7 is Nitrogen. Based on electronic configuration
Electronic configuration is a systematic way of distributing the electrons in their orbitals Electron configurations of atoms follow a standard notation in which all electron-containing atomic subshells (with the number of electrons they hold written in superscript) are placed in a sequence.
Electron Configurations are useful for:
Determining the valency of an element.
Predicting the properties of a group of elements (elements with similar electron configurations tend to exhibit similar properties).
Interpreting atomic spectra.
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an important intermediate reaction in the industrial production process of nitric acid is shown. what is the theoretical yield of h2o (18.02 g/mol) if 45.0 kg of nh3 (17.04 g/mol) reacts with excess o2 (32.00 g/mol)?
The theoretical yield of H₂O in this reaction is 31.69 Kg.
The chemical equation of the reaction of NH₃ and O₂ is,
NH₃ + O₂ → NO + H₂O
Now, balancing this equation,
4NH₃ + 5O₂ → 4NO + 6H₂O
So, as per reaction, we can see,
NH₃ is limiting reagent, hence it will decide the extent of products,
4 moles of NH₃ reacts completely with two oxygen to form 6 moles of water.
Moles = Mass reacted/formed/molar mass.
Molar mass of NH₃ = 17.04 g/mol
Reacted mass of NH₃ = 45000 g.
Molar mass of H₂O is 18 g/mol
Now, can write,
4 x (mass of NH₃ reacted/molar mass of NH₃) = 6 x (mass of H₂O formed/molar mass of H₂O)
4 x (45000/17.04) = 6 x (Formed mass of H₂O/18)
Formed mass of H₂O = 31690.14 grams.
Formed mass of H₂O = 31.69 Kg.
So, the theoretical yield of H₂O is 31.69 Kg.
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true or false-an oxygen molecule (o2) has eight times as much mass as a hydrogen molecule (h2). for equal masses of oxygen and hydrogen at the same volume and the same temperature, the oxygen sample will exert more pressure than the hydrogen sample.
The oxygen molecule is 16 times heavier than the hydrogen molecule. So, the answer is false. The molar mass of gases decide the mass of the gases.
What is molar mass?
Molar mass is the mass of the substance divided by the number of moles of that substance. The SI unit of molar mass is Kg/mol. It is an intensive property. It is the mass of the substance in 1 mole of that substance.
The molar mass of hydrogen molecule (H2) is 2 g/mol. The molar mass of oxygen molecule (O2) is 32 g/mol. The oxygen molecule is heavier than hydrogen molecule.
Therefore the oxygen molecule has a molar mass of 32 g/mol which is 16 times more than the molar mass of hydrogen molecule which is 2 g/mol. The answer is false.
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(100 POINTS) Compare the forces between particles solids, liquids, gases
While solids have certain shape and volume, liquids only have definite volume but not shape, gases neither have shape nor volume. The level of energy is highest in gases, medium in liquid and lowest in solids. The compression of solids is difficult, liquids are nearly incompressible, but gases can be easily compressed.
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Rationalize the order of elution of the two compounds you isolated from the column in this experiment.
Hexane is initially employed as the eluting solvent to remove the bibenzyl. The bibenzyl will be eluted first because the nonpolar molecule is particularly soluble in hexane (a nonpolar solvent) .
What is called a compound?A mixture in chemistry is a material comprised of two or more separate chemical elements mixed together in a certain proportion. Chemical connections that are challenging to break are created when the components interact with one another. These bonds result in the development of atoms sharing or trading electrons.
Is an element a compound?Pure components and compounds can be found in nature. A element is formed up of many elements in a predetermined ratio, as opposed to an element, which is a substance comprised of the same sort of atoms.
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for the titration of 20.00 ml of 0.500 m hcl with 0.500 m naoh: (2.5 pts) a. write the equation for the reaction taking place during the titration: b. calculate the ph before the addition of naoh: c. calculate the ph after the addition of 10.00 ml of 0.500 m naoh: d. calculate the ph after the addition of 20.00 ml of 0.500 m naoh: e. calculate the ph after the addition of 20.20 ml of 0.500 m naoh:
(a) The balanced chemical equation is -
NaoH + Hcl - Nacl + H2O
(b) For the pH before addition of NaoH, we need
pH = log [H+]
= -log [0.5]
=-(-0.3)
=0.3
The pH of the solution before addition of NaoH is 0.3
(c) Mole of NaoH = 0.5 x 10 = 5molar
Mole of Hcl = 0.5 x 20 = 10mili molar
Unreacted moles of Hcl = 10 -5 = 5 moles.
Total volume = 20 +10 = 30 ml
Molarity = 5 moles / 30ml = 0.166
pH = -log (0.166) = 0.77
(d) Moles of NaoH = 20 X 0.5 = 10 milli molar.
Therefore, Hcl consumed = 10 milli mole.
pH of water = [H+] = 10^-7 molar.
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what is the minimum light-photon energy that can dissociate a hydrogen molecule? express your answer to one significant figure and include the appropriate units.
The lowest energy of a light-photon that may split a hydrogen molecule is 7*10-19J. The energy of a quantum of light is known as a photon. Light is both a wave and a particle, according to its dual nature.
The light-photon or quanta of light are other names for the light particle. The most basic molecule is a hydrogen molecule. Electrostatic forces hold together its two protons and two electrons, which are bound together. The assemblage can exist at various energies, similar to atomic hydrogen. both para- and orthohydrogen. The energy that is equal to the minimum amount of light-photon energy is equal to the bond energy of the hydrogen molecule molecule, according to the energy diagram of hydrogen as a function of atomic separation.
Light photon energy at the minimum is 7*10-19 J.
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Balancing Chemical Equations and Identifying Types of Reactions Assignment.
10th grade Chemistry.
Answer:
how are you doing, please kindly help me with my homework
the total amount of heat flow on compressing the co2 using the entropy balance and generalized chart of entropy departure. is the heat flow positive or negative? why?
Heat is chosen to be positive when it enters a system and negative when it exits, represented by the symbol Q and unit Joule. The temperature difference between two bodies causes heat flow.
What is an entropy in chemistry?The amount of heat per unit of temperatures in a system that cannot be used to carry out beneficial work is known as entropy. Entropy is a measure of a system's molecular disorder or unpredictability since work is produced by organized molecular motion.
What is entropy principle?All spontaneous shifts in an isolated system, according to the entropy principle, occur in the direction of growing entropy. These transformations can be seen in the dispersion of gradients or the evaporation of lots of energy into low-grade energy, which eventually turns into heat energy.
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matter can be broadly described as a solid, liquid, or gas. (there are more exotic states, including plasma, but we will ignore them for now.) in which phase of matter is the material that makes up the atmosphere?
All the three phases (solid, liquid, gas) of matter make up the atmosphere.
Phases are also known as state - states of matter or phases of matter. There are generally three states of matter - Solid, liquid, and gases.
Among all three gases have the lowest density as they have the weakest intermolecular forces. If gases are put in a container, then they fill up the entire volume of the container. In gases, the molecules are constantly moving and getting replaced by other gas particles.
In contrast to gases, the liquids have relatively higher intermolecular forces and are relatively dense and incompressible. In liquid we can determine the viscosity that is - the rate at which they flow.
Solids are relatively dense, rigid and have highest intermolecular force unlike liquids and solid. In solids, the molecules are compactly packed, hence preventing the molecules from moving from its place.
Complete question: -
Matter can be broadly described as a solid, liquid, or gas. (There are more exotic states, including plasma, but we will ignore them for now.) In which phase of matter is the material that makes up the atmosphere? A. solid B. liquid C. gas D. All of these
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suppose you need 100 ml of a 0.00046 m solution for an experiment. you are given 10 ml of a 4.6 m stock solution. what is the best method to get the final volume and concentration you need?
Dilute solution is the best method to get the final volume and concentration as we need.
Dilution is "the process of reducing the concentration of a solute in a solution by simply adding more solvent to the solution, eg. water." To dilute a solution, add solvent without adding solute. Adding water to a concentrated solution to achieve the required concentration is a common way to create a solution of a specific concentration. Dilution is the technical term for this process. Dilution can also be achieved by mixing high and low concentration solutions. Stock solutions are often purchased and stored at high concentrations, requiring dilution of the solution as a laboratory procedure. Solutions must be accurately diluted to known low concentrations prior to laboratory use.
Dilution Formula
Dilution is the process of adding solvent to a solution to reduce the concentration of solutes.
molarity = moles of solute / liters of solution
moles of solute = (molarity)(liters of solution)
moles of solute = MV
The initial and final conditions are expressed numerically,
M₁V₁= M₂V₂
In form of concentration equation will write as C₁V₁= C₂V₂
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PLEASE HELP FAST
What is the chemical formula for the ionic compound formed by Na+ and N¯³
Responses:
NaN,
Na3N,
NaN3,
Na3N3
Answer:
The chemical formula for the ionic compound is
Na3N3
which way of dissolving does not change the chemical identity of the solute? responses dispersion dispersion disintegration disintegration ionization ionization dissociation
Dispersion does not change the chemical identity of the solute.
The dispersed phase is solute and dispersed medium is solvent. When ink is added to the water then it is dispersed in water, therefore the chemical identity is not changed.
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what is the percent by mass (m/m%) of ethanol (c2h6o) solution that was prepared by dissolving 50.500 g of ethanol into water to a final volume of 750.0 ml? assume the solution has a density of 1.20 g/ml.
The (m/m%) concentration of ethanol is the solution is 5.55%.
The density of the solution is given to be 1.20 g/ml. The volume of the solution is 750 ml.
We know,
Density = mass/volume
Mass of solution = Density of solution x Volume of solution
Mass of solution = 1.2 x 750
Mass of solution = 900 grams.
The mass of solute, ethanol is 50 grams.
So, (m/m%) of ethanol is,
(m/m%) of ethanol = Mass of ethanol/mass of solution x 100
(m/m%) of ethanol = 50/900 x 100
(m/m%) of ethanol = 5.55%.
So, the (m/m%) of ethanol is 5.55%.
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What is the mass concentration of 2mole HCL solution?(h=1,Cl=35.5)
Answer:
So the answer to the question “What is the mass concentration of hydrogen chloride in 2.0-molar hydrochloric acid?” is 73 grams per liter.
Help!!
Predict the missing component in the nuclear equation.
The missing component in the nuclear equation is [tex]{{0} \atop {-1}} \right.[/tex]e.
Nuclear reactions are processes in which one or more nuclides are produced from the collisions between two atomic nuclei or one atomic nucleus and a subatomic particle. The nuclides produced from nuclear reactions are different from the reacting nuclei (commonly referred to as the parent nuclei).
In the given reaction in order to balance the reaction we can see that their mass numbers are same so the difference between them is = 0, and the difference in their atomic number is 91-90 = 1, hence the component is the [tex]\beta[/tex] particle that is formed.
This type of nuclear reaction is know as [tex]\beta[/tex]decay nuclear reactions
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Joe measured 60.1 mL for the volume of the object. The actual volume of the object was 54.6 mL. What is the percent error of Joe’s results?
The percent error of Joe’s results is equal to 10.07 %
What is the percent error?The percent error can be described as the difference between the actual value and the measured or approximate value. The percent experiment is used in scientific experiments to check the accuracy of the experimental results.
The mathematical formula of the percent error can be represented as:
Percentage error = (Measured value - Exact value)/Exact value] ×100
Given, the volume measured by Joe = 60.1 ml
The actual volume of the object = 54.6 ml
The percent error = (60.1 - 54.6)/54.6] ×100 = 10.07 %
Therefore, the percentage error of Joe's results is 10.07 %.
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A student builds a battery-powered car from a kit. Which series of energy transformations takes place as the car moves forward?
A:Electrical energy-Chemical energy- mechanical energy
B: Chemical energy-mechanical energy-electrical energy
C:mechanical energy-electrical energy-chemical energy
D:chemical energy-electrical energy-mechanical energy
The option A is correct , Firstly electrical energy is converted into mechanical energy via chemical energy.
The force generated by an engine powered by electricity is what propels an electric vehicle forward. These automobiles feature an original and useful design in addition to being environmentally friendly.
What is the operation of electric cars is that the electrical energy is supplied to the engine, which uses electromagnetic interactions to convert it into mechanical energy.
Energy transformations is the process of a type of energy form transforming into a new form of energy
When they enter a magnetic field, the conductive material inside them moves, and the electric current then passes through it.
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what is the temperature of ethanol is the standard enthalpy of vaporization is 39 kj and the standard entropy of vaporization is 110 j/k?
The temperature of ethanol is 354 ⁰C if the standard enthalpy of vaporization is 39 kjmol⁻¹ and the standard entropy of vaporization is 110 j/k
How is the temperature of Ethanol calculated?The change in entropy is calculated as:
ΔS = ΔH/T
Here,
ΔS is change in entropy
ΔH is the enthalpy
T is the temperature
We have,
ΔS = 110 j/k
ΔH = 39 kjmol⁻¹ = 39000 jmol⁻¹
Therefore,
T = ΔH/ΔS
T = 39000/110
Hence, the temperature of ethanol is T = 354 ⁰C
What is entropy?Entropy is the amount of available energy equal to the thermal energy of a system per unit temperature. Evaporative entropy is the ratio of the heat of vaporization to the heat of boiling. The standard entropy of vaporization of ethanol is +115 J/mol.K.
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what is the molarity of potassium acetate in a solution made by adding 50 ml of 2.00 m nitric acid with enough water to make 450.0 ml of solution?
The molarity of potassium acetate in a solution made by adding 50 ml of 2.00 m nitric acid with enough water to make 450.0 ml of solution is 0.22 mol/L.
A chemical species' concentration in a solution, specifically the amount of a solute per unit volume of solution, is measured by its molar concentration. The number of moles per liter, denoted by the unit symbol mol/L or mol/dm³ in SI units, is the most often used unit denoting molarity in chemistry.
We know that, M₁V₁ = M₂V₂
Here, M₁ =?
V₁ = 450 mL
M₂ = 2 M
V₂ = 50 mL
M₁ × 450 = 2 × 50
M₁ = 100/450
M₁ = 0.22 mol / L
Thus, we need 0.22 mol/L of potassium acetate in a solution made by adding 50 ml of 2.00 m nitric acid with enough water to make 450.0 ml of solution.
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2
A student observed a sperm cell using a microscope at a
magnification of x400.
The sperm cell image measured 22 mm long.
Use the equation to calculate the real size of the cell.
Give your answer in micrometres (μm).
size of image
size of real object
219) 3120 20 2019) ST220M
magnification =
A student observed a sperm cell using a microscope at magnification of x400 and sperm cell image measured 22 mm long then the actual size is = 55 μm.
What is microscope and magnification?A simple microscope produces an image of the object upon which the microscope is focused whereas magnification is the ability to make small objects seem larger such as making a microscopic organism also visible. Ability to distinguish two objects from each other is called as resolution
As we know that, 1 mm = 1000 μm.
So, 22mm = 22000 μm
Magnification of x400 given
We can calculate, Actual size = image size / magnification.
= 22000/400
Actual size = 55 μm
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Many alcohols, including ethanol, are soluble in water.
Explain, with the aid of a diagram, why ethanol is soluble in water.
Include relevant dipoles and lone pairs.
Answer:
because ethanol is polar
Explanation:
polar dissolves in polar. Ethanol has a hydroxyl(-OH) functional group in it.
Due to the presence of a bond between electronegative atom oxygen and hydrogen, the O-H bond acquires polarity.
Hence, due to the presence of polarity in O-H bond, it forms a Hydrogen bond with water which is responsible for the responsibility of ethanol in water.
Based on the Law of Conservation of Mass, what mass of products form when baking soda decomposes?
The mass of the products form when baking soda decomposes is 25.00 grams
How do I determine the mass of the products?We can determine the mass of the products formed by simply observing the law of conservation matter (mass). Details below
The law of conservation of matter states that matter can neither be created nor destroyed during a chemical reaction but can be transferred from one form to another.
Thus, for every balanced chemical equation, total mass of reactants must equal to the total mass of the product obtained.
With the above information, we can detertmine the mass of the products obtained as follow:
2NaHCO₃ → Na₂CO₃ + H₂O + CO₂
Mass of reactant = Mass of product
Mass of NaHCO₃ = Mass of (Na₂CO₃ + H₂O + CO₂)
25.00 g = 25.00 g
Thus, the mass of the products is 25.00 g
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a cylinder of o2(g) used in breathing by emphysema patients has aovlume of 3.00 l at a pressure of 10.0 atm. if the temperature of the cylinder is 28.0 c, what mass of oxygen is in the cylinder
The mass of oxygen present in the emphysema patients' cylinder is 19.64grams.
The ideal gas equation is given by,
PV = nRT
P is the pressure, V is the volume, n is the moles of the gas, R is the gas constant and T is the temperature of the gas.
Mole scan be written as,
Moles = mass/molar mass
Molar mass of oxygen is 16 g/mol.
Here, the volume of the gas is 3 L and the pressure of the gas is 10atm. The temperature of the gas is 298 degrees Kelvin.
Putting the values,
3 x 10 = mass/16 x 0.082 x 298
Mass = 3 x 10/298 x 16/0.082
Mass = 19.64 grams.
The mass of oxygen in the cylinder is 19.64 grams.
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