Helium moves more quickly on average than argon.
How much thermal energy does helium have compared to argon?
Helium has a lower thermal energy than argon does.
Explanation:
Due to the smaller mass of helium atoms in comparison to argon atoms, their average speed is higher under the given conditions. An atom's average speed is inversely related to its mass. While the average speed of an atom reduces as the mass of the atom grows, the opposite is true if the mass of the atom decreases.
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For a certain farming community in California, a water shortage is predicted if the average global temperature rises by 1 degree Celsius. The residents of this community rely on private vehicles powered by fuels for transportation because there is no public transportation system. Farm vehicles powered by diesel fuel are used to harvest crops and get them to market. Residents of the farming community want to reduce their impact on global temperature increases by reducing their carbon dioxide emissions. Residents of the farming community want to reduce their impact on global temperature increases by reducing their carbon dioxide emissions.
Choose the answers below that are true in regards to this scenario.
Question 2 options:
Residents of this community drive personal fuel-powered vehicles.
Farmers in this community use diesel-powered farm vehicles.
Residents in this community are NOT concerned about reducing their CO2 emissions.
The answers that are true in regards to the scenario above is:
Residents of this community drive personal fuel-powered vehicles.Farmers in this community use diesel-powered farm vehicles.So, the first and second options are correct. The third and last option is incorrect.
What is a community?A community is described as a social unit with commonality such as place, norms, religion, values, customs, or identity.
From the scenario above, we can conclude the following:
residents of the farming community want to reduce their impact on global temperature increases by reducing their carbon dioxide emissions. Residents of this community drive personal fuel-powered vehicles.Farmers in this community use diesel-powered farm vehicles.Learn more about vehicles at: https://brainly.com/question/26006107
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quora what situations can you think of that compounding monthly will benefit you more than compounding continuously?
Daily compounding beats monthly compounding. The shorter the compounding period, the higher your effective yield is going to be.
When interest from the previous day is added, the interest earned each day on your savings account balance is known as daily compound interest. Any frequency plan, ranging from daily to yearly, can be used to compound interest. Interest is accrued daily and paid out monthly on all bank accounts from Marcus by Goldman Sachs. The formula for calculating monthly compounding is the principle amount multiplied by one plus the interest rate divided by a number of periods, which is raised to the power of the number of periods. Lenders frequently prefer to present interest rates compounded monthly instead of annually. The interest amount is obtained by deducting that sum from the principal amount.
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it is quite possible to have a positive reaction in a glucose carbohydrate broth and yet a negative reaction in a glucose use methyl red test. this is due to:
This is due to the methyl-requiring acid produced.
Methyl red test is considered positive when the culture medium turns red after the addition of methyl red, because of a pH at or below 4.4 from the fermentation of glucose.
methyl red test is considered negative when the culture medium gives yellow colour after the addition of methyl red.
when the bacteria are grown in a broth medium containing glucose .if the bacteria has the ability to utilise glucose with the production of a stable acid,
the colour of methyl red changes from yellow to red when added to broth culture.
In glucose carbohydrate broth 4 mol of acids,1 mole of ethanol, and 1 mol of CO2 are produced. the large quantity of acid produced causes a significant decrease in pH which gives red colour as a result.
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what is the common characteristic of the electron configurations of the elements ne and ar? in which group would you find them?
Common characteristic of the electronic configuration of neon and argon have is their complete outer shell.
Neon (10) - 1s2, 2s2, 2p6
Argon (20) - 1s2, 2s2, 2p6, 3s2, 3p6
as we can see both the configurations have an complete outer shell means their octet is complete. This is the common characteristic of both the elements.
The both of them lie in group 8A that is the noble gases or inert gas.
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will your body be able to function without your skeleton system
Which structure is the arrow pointing to?
What is the function of this organelle?
The structure the arrow is pointing to is the nucleus and it helps store genetic material (DNA) in living cells.
What is an organelle?Organelle is a specialized structure found inside cells that carries out a specific life process. examples are ribosomes, vacuoles, nucleus etc.
The nucleus is the large membrane-enclosed organelle found in eukaryotic cells which contains genetic material.
The nucleus is located at the center of living cells and it functions to store genetic material called DNA. The DNA is transferred to offsprings for inheritance of traits.
According to this question, a microscopic image of a cell is shown. The arrow pointed to the nucleus of the cell.
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which of the following changes occur when an acid solution of unknown concentration is titrated with a standardized solution of naoh? select all that apply. multiple select question. the color of the indicator slowly changes over the course of the titration. the ph of the acid solution decreases. the concentration of h ions in the acid solution decreases. the ph of the acid solution increases.
The colors of the starting solutions differ in case of high and low concentrations, because the titrations start at different pH values.
The colors of the starting solutions vary in case of high and coffee concentrations, due to the fact the titrations start at distinctive pH values. In case of excessive concentrations, the starting color is of brilliant pink red, converting to purple orange all through innovative titration.
The signs have a chemical structure which can soak up mild beneath positive pH conditions and both change shade or grow to be colorless below other pH situations. This normally happens because of a exchange in protonation of the purposeful group of the molecule.
Whether an answer is acidic or simple can be measured at the pH scale. When everyday indicator is brought to a solution, the color change can indicate the approximate pH of the solution. Acids purpose universal indicator option to trade from green in the direction of crimson.
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The molar mass of a substance can be calculated from its density alone if that substance is an element gas at STP liquid or solid
The molar mass of a substance can be calculated from its density alone if that substance is a gas at STP.
What is the molar mass of a substance?The molar mass of a substance is the mass of one mole of that substance.
One mole of a substance is the amount of that substance that contains as many elementary entities as there are in 12 g of carbon-12.
The number of particles in 12 g of carbon-12 is the Avogadro number = 6.03 * 10²³ particles.
One mole of all gases occupies the same volume at STP.
Also, the molar mass of a gas is related to the vapor density of that gas by the formula below;
The molar mass of a gas = vapor density * 2Hence, the molar mass of a gas can be determined from the density of the gas by multiplying the vapor density of the gas. by 2.
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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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Sodium can combine with element "X" so that
the chemical formula is Na₂X. What element
could element "X" be?
A)Phosphorus
B)Helium
C)Magnesium
D)Sulfur
The element could be X is phosporus .
What is element?
An element is the fundamental item that can't be easily broken onto smaller of pieces. In chemistry and physics, an elementary is a substance that can't be broken down by non-nuclear reactions. In computing and the mathematics, an element is the distinct piece of a larger system or set.
Sol-An ionic compound is formed by the ions, which their charges replaced, so the compound Na₂X is formed by the ions Na⁺ and X⁻². Thus, X must gain two electrons to be stable at the octet, so it has 6 valence electrons. Because it can accommodate up to 12 electrons, the elememts expands the octet, do it must be in the 3rd period or higher.
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Put the following elements in order from smallest to largest atomic radius: Carbon, Oxygen, Tin, Strontium
The order of the elements from smallest to largest atomic radius are O<C<Sn<Sr.
What is the definition of an atom's atomic radius?Atomic radius is the separation between an atom's outer electron shell and nucleus. 1/2 the distance between identical atoms that are bound together by their nuclei. Positively charged ions known as cations are smaller than their neutral atom.
Therefore, The distance between the center of the nucleus and the biggest shell inhabited by the valence electron of a neutral element is known as the atomic radius, which is an attribute of atoms. This would rely on the atom's atomic number and the quantity of electrons it contains.
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(c) Lithium oxide is an ionic compound.
Draw a dot and cross diagram to show how lithium and
oxygen combine to form lithium oxide.
Only show the electrons in the outer shell of each
atom.
Give the charges on the ions formed.
Answer:
Let us know formula and denotion for Lithium oxide is Li2O.
Explanation:
While on the basis of Electronic configuration:
Lewis structure(for Lithium atom)-Li•
For Oxygen atom- it is 6 dots in the Word O(for Oxygen) but is needed to paired in a pair(of two dots if possible) by the use of either all sides where two dots are presented two sides While one dot is represented on other two sides.
When we come across we might have a simple question how and why the Lithium oxide is Li2O
So,as we know Li(have one electron in its outermost shell),written as Li^+/+1 While Oxygen requires 2 more electrons to stabilize its valency,so it written as O^-2/2-
On combining,Li^+ & O^-2
Exchange and crossing up of valency is done forming Li2O.
Do check the image uploaded for better clarity and understanding.
Identify the following as metals, nonmetals or metalloids using the periodic table.
a. Silicon
b. fluorine
c. uranium
d. mercury
e. arsenic
f. iridium
An alloy of bronze was made by combining 88 % copper and the rest is composed of tin. Determine the density of the bronze sample using a weighted average.” 8.76g/cm
Based on the densities and percent mass of copper and tin, the density of Bronze is 8.76 g/cm³.
What is density?Density is the ratio of the mass and volume of a substance.
Density = mass/volumeFor a mixture, the density of the mixture is the weighted average of the densities of the substance in the mixture.
The density of the bronze is calculated as follows;
The density of bronze = percent mass of copper * density of copper + mass of tin * density of tinThe density of copper = 8.96 g/cm³
Percent mass of copper = 88%
The density of tin = 7.3 g/cm³
Percent mass of tin = 12%
The density of Bronze = 88% * 8.96 + 12% * 7.3
The density of Bronze = 8.76 g/cm³
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5
Use this equation for the next question.
Mg(OH)2 + NaCl ® MgCl₂ + NaOH
Does it satisfy the Law of Conservation of Matter?
Yes
No
Answer:
Chemistry Secondary School answered Mg (OH)₂ + HCl→ MgCl₂ + H₂O balance it Answer 5.0 /5 6 Diabolical Answer: The answer will be; = Mg (OH)₂ + 2 HCl → MgCl₂ + 2 H₂O That's all. Find Chemistry textbook solutions? Class 12 Class 11 Class 10 Class 9 Class 8 Class 7 Class 6 Preeti Gupta - All In One Chemistry 11 3080 solutions
(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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if a certain gas has a density of 2.34 g/l at 27.0c and 742 torr, calculate the molar mass of this gas
The molar mass of this gas is 59.0 g/mol.
Molar mass is described as the mass in grams of 1 mole of a substance. The gadgets of molar mass are grams in keeping with mole, abbreviated as g/mol. The mass of an unmarried isotope of any given detail (the isotopic atomic mass) is a cost concerning the mass of that isotope to the mass of the isotope carbon-12.
Calculation:-
PV = nRT
P = 742 torr = 0.976 atm
P × molar mass = density × R × T
0.976 * molar mass = 2.34* 0.0821*300
0.976 * molar mass = 57.6
molar mass = 59.0 g/mol
Therefore, the molar mass = 59.0 g/mol
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why is the extrapolation method for determining the titration end point is more accurate than finding the minimum conductivity
Extrapolation method for determining the titration end point is more accurate than finding the minimum conductivity because there is no human error when calculating as there could be with doing the actual experiment
Extrapolation is the estimating an unknown value based on extending a known sequence of values and to extrapolate is the infer something not explicitly stated from existing information and the point at which the indicator changes color is called as endpoint and so the addition of an indicator to the analyte solution help us to visually spot the equivalence point in an acid base titration and the endpoint refer to the point at which the indicator changes color in and acid base titration
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what three flaws of the traditional periodic table does jeff moran feel he has addressed with his periodic spiral
The three major flaws addressed by Moran's periodic spiral are:
1) Since hydrogen possesses distinct attributes that set it apart from every other element in the table, it effectively does not belong to any of the table's 18 columns.
2) The lanthanides and actinides, which are the elements from each period of the f block, have comparable properties but are not shown in columns in the table.
3) The column-and-row layout of the periodic table hides the continuity between the pieces, which is better represented by an a spiral.
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where was oxygen discovered?
Answer: nowhere from trees
Explanation:
an experiment called for l of sulfur dioxide, , at and atm. what would be the volume of this gas at and atm?
since you have Sulphur dioxide in the experiment . Use Charles' Law, to know the volume [tex]V 1 /T 1 = V 2/ T 2[/tex]
what is the volume of the gas ?
The volume of gas is defined as the space occupied by the gaseous particles at standard temperature and pressure conditions. It is denoted as 'V'. The SI unit of volume is 'Litres' denoted as 'L'. A mole of gas has a volume at room temperature.Boyle's Law - states that the volume of a given amount of gas held at constant temperature varies inversely with the applied pressure when the temperature and mass are constant.Volume = length x width x height.You only need to know one side to figure out the volume of a cube.The units of measure for volume are cubic units.Volume is in three-dimensions.You can multiply the sides in any order.Which side you call length, width, or height doesn't matter.The volume of a gas is directly proportional to its temperature when pressure is constant. The ratio of volume to temperature is constant when pressure is constant. This relationship is known as Charles' law or Gay-Lussac's law .to know more about volume of the gas follow
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describe the bohr model for the atom and explain how it accounted for the emission spectra of atoms.
The Bohr model for the atom explains how electrons chenges different energy levels and accounted for the emission spectra of atoms.
The Bohr model postulates that electrons orbit the nucleus at constant electricity ranges. Orbits in addition to the nucleus exist at better electricity degrees. While electrons go back to a decreased strength level, they emit energy in the shape of light.
Bohr's model shows that the atomic spectra of atoms are produced via electrons gaining energy from a few supplies, leaping as much as a better electricity degree, then without delay losing returning to a lower strength stage and emitting the strength difference among the 2 power ranges.
Bohr explained the steadiness of atoms by using presenting that electrons revolve across the nucleus inside the exact circular paths having fixed strength and while transferring in the same orbit they do now not lose or benefit from strength.
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you start with a flask at 900k containing only sulfur trioxide at an unknown pressure and allow the equilibrium below to be established. if the final sulfur trioxide pressure is 5.00 atm, what was its initial pressure? 2 so2 (g) o2 (g) <--> 2 so3 (g) kp
2so3 is the initial pressure that is seen to be used for the chemical reactions with flask 900k
what is pressure in a chemical reaction?
Pressure (P) is defined as the force of all the gas particle/wall collisions divided by the area of the wall: All gases exert pressure; it is one of the fundamental measurable quantities of this phase of matter.We can define pressure as: The force applied perpendicular to the surface of an object per unit area over which that force is distributed.The pressure of the gas is the force that the gas exerts on the container boundaries. The gas molecules move randomly along the given volume. During this movement, they collide with the surface and also with each other.A simple example of pressure may be seen by holding a knife to a piece of fruit. If you hold the flat part of the knife against the fruit, it won't cut the surface. The force is spread out of a large area (low pressure).Pressure is defined as force applied per unit area. Mathematically it is given by, P=FA. where F is the force acting perpendicular to the surface area A. The standard unit of pressure is the pascal (Pa), equivalent to one newton per meter squared (N/m 2 ).The rapid motion and collisions of molecules with the walls of the container causes pressure (force on a unit area). Pressure is proportional to the number of molecular collisions and the force of the collisions in a particular area. The more collisions of gas molecules with the walls, the higher the pressure.to know more about pressure follow
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24 points
Which two particles have opposite charges?
O A. lons and neutrons
B. Electrons and protons
OC. Neutrons and protons
OD. Electrons and neutrons
Answer:B
Explanation: according to the law of electrostatics it states that "unlike charge attract each other and like charges repel each other ".
14.what volume, in milliliters, of 6.0 m naoh is needed to prepare 175 ml of 0.20 m naoh by dilution?
5.83ml of NaOH is needed to prepare 175 ml of 0.20 m by dilution.
Dilution is the process of “lowering the concentration of a solute in a solution by simply adding more solvent to the solution, such as water.” Diluting a solution enables adding more solvent without adding more solute.
into formula to find out the volume is ;
[tex]V_{1}[/tex][tex]N_{1}[/tex] = [tex]V_{2}N_{2}[/tex]
where [tex]V_{1}[/tex]= ?
[tex]V_{2}[/tex] = 175ml
[tex]N_{1}[/tex] = 6
[tex]N_{2}[/tex] = 0.2
So, ⇒ [tex]V_{1}[/tex]×6 = 175×0.2
[tex]V_{1}[/tex] = 5.83 ml
So, 5.83ml of NaOH is needed to prepare 175 ml of 0.20 m by dilution.
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ammonium nitrate (nh4no3) dissolves spontaneously and endothermically in water. how is this possible?
Ammonium nitrate , NH₄NO₃ dissolves spontaneously and endothermically in water because the temperature of solution decreases.
When we add ammonium nitrate , NH₄NO₃ to water at 298 K , it dissolves spontaneously and the temperature of system decreases. this means the heat is absorbed by the system and when the heat is absorbed by the system the process is called as endothermic. the ammonium nitrate when dissolve in water it will dissociates in to ions which requires the energy so heat is absorbed. this process in endothermic.
Thus, Ammonium nitrate , NH₄NO₃ dissolves spontaneously and endothermically in water because the temperature of solution decreases.
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How does the atomic radius change as you move left to right in Period 3 from aluminum through chlorine? Refer to the periodic table.
A. it generally increases.
B. it does not change.
C. it generally decreases.
D. it varies unpredictably.
Answer:
C it generally decrease
Explanation:
Atomic radius of an element decrease from left to right of the periodic table
I need this answer somebody Please help me
The correct responses that describe the various rules in the filling of orbitals are;
1) Aufbau principle
2) Pauli exclusion principle
3) Hund's rule.
What is the orbital?The orbital has to do with the region in space where there is a high probability of finding the electron. We have to know that that looking at the orbitals, we can know how electrons are arranged in the atoms in order of increasing energy.
The Aufbau principle shows us that when we try to fill the electrons into orbitals, we must start from the orbital that has the lowest energy. The Pauli exclusion principle states that no two electrons in an atom can have the same value for all the four quantum numbers. In other words, electrons in the same orbital must have anti parallel spins.
Also, when we are filling electrons into orbitals that have the same energy, we fill them in singly first. This is the statement of the Hund's rule.
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a flask is filled with 1.65 moles of a gas at 26.1 k and 444.8 mm hg. the flask is then opened and additional 1.76 moles are added. the temperature of the flask is then changed to 281.1 k. what is the pressure (in atm) of the flask under these final conditions?
The pressure of the flask under these final conditions is 13 atm .
What are moles ?
The current SI definition of moles and the "new SI" draft definition will be reviewed. Current textbook treatments of moles are compared to these official definitions. From a historical perspective, in 1971 he reviews the treatment of moles and material quantities in textbooks before and after the introduction of these quantities in SI. Textbook definitions do not always match official definitions, but reflect common usage by chemists. This is because when the new SI is adopted, the textbook definition will likely be closer to the official definition, and the draft definition more closely matches what is found in many textbooks than the current official definition. However, SI-based quantities of substances are likely to continue to cause problems for chemistry teachers and, if retained, are largely ignored by chemistry practitioners.
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the standard gibbs free energy of formation of is zero. (a) h2o(l) (b) k(s) (c) cl2(g) the standard gibbs free energy of formation of is zero. (a) (b) (c) (a) only (b) only (c) only (b) and (c) (a), (b), and (c)
The standard Gibbs free energy of formation of is zero are option (b) K(s) and (c) Cl₂(g).
Gibbs free energy may be more than zero, much less than zero, and identical to zero. If Gibbs free energy is more than zero the response is a nonspontaneous reaction. If Gibbs free energy is less than zero the reaction is a spontaneous reaction.
The usual Gibbs free energy of formation of a compound is the exchange of Gibbs unfastened energy that accompanies the formation of 1 mole of that substance from its issue elements, of their well known states.
Gibbs free energy, G is a price that defines how spontaneous a response is, with a poor fee which means the reaction is spontaneous, and a advantageous cost that means the reaction is nonspontaneous. This fee is the combination of enthalpy and entropy.
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