If you perform a melting point test on a metal sample, you would expect to observe that the metal has a relatively high melting point compared to non-metallic materials. This is because of the strong electrostatic forces between the positive nuclei of the metal atoms and the negative electrons, which hold the metal atoms together in a tightly packed lattice structure. As a result, a large amount of energy is required to overcome these forces and melt the metal.
Metal samples are expected to be excellent conductors of heat and electricity when a conductivity test is performed on them. This is because electrons in metallic solids move through the metal fairly easily and are free to move around the lattice structure. This free movement of electrons allows heat and electricity to easily pass through the metal, making it highly conductive.
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Which term refers to a substance that changes color when there is a certain concentration of hydrogen ions in a solution
Chemical Indicator refers to a substance that changes color when there is a certain concentration of hydrogen ions in a solution.
Chemical indicators are any substances that provide a clear indication—typically a change in color—of the presence or absence of a certain chemical species, like an acid or an alkali, in a solution. One such chemical is methyl yellow, which gives an alkaline solution a yellow color. When introduced to acidic or alkaline solutions, substances are considered indicators when their color changes. There are several indicators that are frequently used in laboratories, including litmus, phenolphthalein, and methyl orange. Litmus paper: It turns red in acidic solutions and blue in basic ones. Methyl orange: This chemical exhibits a red color in an acidic solution and a yellow color in a basic solution.
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The reaction in which H2O(l) is decomposed into H2(g) and O2(g) is thermodynamically unfavorable (ΔG°>0). However, an electrolytic cell, such as the one represented above, can be used to make the reaction occur. Which of the following identifies a flaw in the representation?
Answer:
B) The equation for the reaction is not correctly balanced.
Explanation:
The decomposition of the water molecule in the hydrogen and the oxygen atoms are carried by the electrolytic cell. The equation for the reaction given is unbalanced.
What is a decomposition reaction?The decomposition reaction is given as the reaction in which the compound is degraded into the constituent ions.
The electrolytic cell functions in the breakdown of water to hydrogen and oxygen with the application of the electric current.
The balanced equation for the decomposition of water is:
[tex]\rm 2\;H_2O(l)\;\rightarrow\;4\;H_2(g)\;+\;2\;O_2(g)[/tex]
The flaw in the given reaction is the decomposition is the unbalanced chemical equation.
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What physical property is characteristic of all of the elements in the group 18 of the periodic table?
The quantity of electrons inside the valence (outermost) shells as well as the electron configurations among elements belonging to the identical group are identical. They display comparable chemical characteristics.
Noble gases were low chemically reactive, odourless, colourless, nonflammable, as well as monotonic gases. Noble gases are exceedingly stable as well as uncommon to form chemical connections since they have minimal inclination to receive or lose electrons, thanks to the complete valence electron shells of such atoms.
These gases don't receive, lose, or share electrons, making them inert as well as unreactive. They are often referred to as noble gases due to their rarity inside the atmosphere of the earth.
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hi, this is chemistry if anyone would help, it would be great :)
To solve this we must be knowing each and every concept related to atom and its discoveries. Therefore, electron was discovered by J.J Thomson.
What is atom?Atom is the smallest particle of any element, molecule or compound. Atom can not be further divided. Atoms contains nucleus in its center and electron that revolve around the atom in fixed orbit.
In the nucleus, proton and neutron are present. Electron has -1 charge while proton has +1 charge. Neutron is neutral that is it has no charge. So overall the charge of nucleus is due to only proton, not by neutron. Electron was discovered by J.J Thomson.
Therefore, electron was discovered by J.J Thomson.
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At 298 K and 1 atm, bromine is a liquid with a high vapor pressure, whereas chlorine is a gas. This provides evidence that, under these conditions, the
At 298 K and 1 atm, bromine is a liquid with high vapor pressure, while chlorine is a gas. This proves that the intermolecular forces of bromine are greater than those of chlorine under these conditions.
At a temperature of 298 K and a pressure of 1 atm, bromine is in a liquid state due to the strong attraction between Br-Br molecules.
At the same temperature and pressure, chlorine exists in the gaseous state due to covalent bonds, while bromine has non-polar covalent bonds.
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Which element does not form a stable ion with the same electronic configuration as neon?
A Magnesium B Fluorine C Sodium D Chlorine
Answer:
Explanation:
chlorine
Chlorine must lose 7 electrons to attain the electronic configuration of Neon and this state is precarious in the case of chlorine which is an electronegative element
What is a proposed explanation for an observation? A. experiemnt B. hypothesis C. theory D. scientific law
A proposed explanation for an observation is theory. Option C is the correct answer.
What is a theory?This refers to a carefully articulated explanation for observations of the natural world that have been arranged using the scientific method, gathering many facts and hypotheses.
A proposed explanation for an observation is a statement or theory that attempts to explain or account for an observation. It is a possible explanation for a phenomenon and is often based on available evidence, research, and data. It may be tested and refined through further observation and experimentation to determine its accuracy and validity.
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The half-life of titanium-44 is 60.0 y. A sample of titanium contains 0.600 g of titanium-44. How much remains after 100.0 y
The amount of titanium-44 remaining will be 1/4 of the original amount, or 0.150 g.
What is amount?Amount is a quantity or magnitude of something, typically money. For example, a person may refer to the "amount of money" they have saved, the "amount of time" it takes to do something, or the "amount of food" they have purchased. Amount can also refer to the total number of something, such as the "amount of people" who have attended an event or the "amount of work" that needs to be done.
The half-life of titanium-44 is 60.0 y, meaning that after every 60.0 y, the amount of titanium-44 will be halved.
0.600 g - 0.150 g = 0.450 g
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Can someone plz help me with this because I do not understand it ASP
Answer:
I'm not the best at chemistry but from what I remember you need to balance the equation and you need the arrows. It wants you to use double displacement and so thats the definition im assuming.
Explanation:
An example would be
Na2SO4 + SrCl2 --> 2 NaCl + SrSO4
This is a balanced equation.
https://en.intl.chemicalaid.com/tools/equationbalancer.php
This link will help you balance an equation.
Hopefully this helps I appologize if it doesn't.
Cant seem to figure this one out…
The specific heat capacity of the substance, given that the subtance changes temperature from 35.0 °C to 65.0 °C when it absorb 15000 J of energy is 50 J/gºC
How do I determine the specific heat capacity of the substance?We'll begin by obtaining the change in the temperature of the substance.etails below:
Initial temperature (T₁) = 35.0 °CFinal temperature (T₂) = 65.0 °CChange in temperature (ΔT) =?ΔT = T₂ - T₁
ΔT = 65 - 35
ΔT = 30 °C
Finally, we shall determine the specific heat capacity of the substance. Details below:
Mass of substance (M) = 10 gHeat absorbed (Q) = 15000 JChange in temperature (ΔT) = 30 °CSpecific heat capacity (C) = ?Q = MCΔT
15000 = 10 × C × 30
15000 = 300 × C
Divide both sides by 300
C = 15000 / 300
C = 50 J/gºC
Thus, the specific heat capacity of the substance is 50 J/gºC
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Elements 'X', 'Y' and 'Z' have these atomic radii, in nanometers. X 0.072 nm Y 0.099 nm Z 0.111 nm
When atomic radii are correctly arranged, how might these elements appear in the periodic table? Why?
Elements 'X', 'Y' and 'Z' have these atomic radii, in nanometers. X 0.072 nm Y 0.099 nm Z 0.111 nm. When atomic radii are correctly arranged, the elements appears as z , y and then x across the period.
The atomic radii decreases across the period as we move from the left to right in the periodic table. the atomic radii will decreases as we move from the left to the right in the periodic table because in the period from the left to right the number of the electron will increases.
Thus, the order of the given elements arranged in the period in the periodic table as first z , then y and then x.
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which type of radioactive decay has the net effect of changing a neutron into a proton?
Answer: Beta Decay is the kind of radioactive decay that has the net effect of changing a neutron into a proton.
Explanation:
The opposite path, in which a neutron becomes a proton, is also possible. Exactly what happens is that a weak force changes the flavor of the card from top to bottom and vice versa. When this happens, the quark emits a W boson, which quickly decays into either an electron/antineutrino pair or a positron/neutrino pair, depending on the direction of change (neutron decays to protons, electron/antineutrino pairs are created).
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the formula for the selenate ion is seo42−. predict the formula for selenic acid.
Answer:
The formula for selenic acid is H2SeO4.
Explanation:
Selenic acid is an oxoacid of selenium, which means that it contains selenium and oxygen atoms bonded together in a compound that also contains hydrogen atoms. The selenate ion, which has the formula SeO42-, is an ion that contains selenium and oxygen atoms bonded together. Based on these facts, we can predict that the formula for selenic acid will contain selenium, oxygen, and hydrogen atoms.
To determine the specific ratio of atoms in the formula for selenic acid, we can look at the valences of the elements involved. The valence of an element is the number of bonds it can form with other atoms. Selenium has a valence of 6, oxygen has a valence of 2, and hydrogen has a valence of 1.
Since selenium has a valence of 6, it can bond with 6 oxygen atoms. This means that selenic acid will contain at least one selenium atom bonded to 6 oxygen atoms. In addition, selenic acid will contain hydrogen atoms, which can bond with oxygen atoms. Based on these considerations, we can predict that the formula for selenic acid will be H2SeO4, which contains one selenium atom bonded to 6 oxygen atoms and 2 hydrogen atoms.
What other factors of weather and climate are affected by elevation?
Answer:
Wind, Rain and Snow
Consequently, winds are stronger at higher elevations. Colder temperatures at higher elevations also create precipitation, because cold air can't hold as much moisture as warm air. Moisture condenses out of the air as snow and ice, and it falls back to the ground.
The factors that affect the weather and climate are latitude, altitude, wind, and distance from the sea.
What is climate?Climate can be described as the long-term weather pattern in an area, averaged over 30 years. Climate is the mean as well as the variability of meteorological variables over months to millions of years.
Some of the meteorological variables that are used to measure are temperature, atmospheric pressure, humidity, wind, and precipitation. The climate can be defined as the state of the components of the climate system, including the atmosphere, cryosphere, lithosphere, and biosphere, and the interactions between them.
The climate is affected by its latitude, terrain, altitude, land use, and water bodies and their currents. Climates can be classified based on the average and typical variables, most temperature, and precipitation. It is used in studying of the biological diversity and how climate change affects it.
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Why is group 17 more reactive than Group 16?
The group 17 elements need only one more electron to complete a full octet since they already possess seven valence electrons. whereas group 16 elements needs 2 more electrons that why group 17 more reactive than Group 16
Because they easily acquire an electron to complete their outermost shell, halogens were highly reactive. Since they easily shed the solitary electron in their outermost shell, alkali metals were very reactive.
Since they easily acquire an electron to complete their outermost shell, halogens were highly reactive. Although they easily lose the lone electron within their outermost shell, alkali metals were highly reactive.
Group 17 elements occur only require one electron, therefore they can easily borrow an electron from another element to achieve a stable configuration for a noble gas. They were hence very reactive as well as will rapidly receive an electron to complete their outermost shell.
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What could occur if the feedback loop of the knee je rk reflex was cut off at any points along its path?
If the feedback loop of the knee reflex was cut off at any points along its path, then there will be no response of knee reflex.
What does it mean if you don't have a knee reflex?Its results in harm to any part of your reflex arc, which can be due to a basic knee-medicinal condition. Healthcare suppliers can disclose hyporeflexia by spouting your knee with a rubber hammer.
If your doctor taps on a band and there isn't a reflexive movement in the muscle, it's a sign of knee-health matter. Usually, absent reflexes are created by an issue with the nerves in the tendon and muscle. You may have other muscle symptoms along with areflexia, like weakness, or atrophy.
So we can conclude that A decline reflex reply can be related to peripheral knee-nervous system disorders.
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Convert 5,500 mg to kg. Show your work to receive full credit.
Which is the correctly balanced chemical equation for the reaction of KOH and H2SO4?
A,B,C,or D?
Answer:
B
Explanation:
Classify: Drag out different combinations of molecules in the Gizmo and categorize them. Give at least three examples of molecule combinations for each intermolecular force.
Dipole-dipole forces
Dipole-induced dipole forces
London dispersion forces
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Why did Louis de Broglie and the “old school” scientists think radio waves could be used to explain the atom?
Answer:
radiowaves obeyed mathematical questions of the atom
Explanation:
From coursehero
Radiowaves seemed to abide by the mathematical equations of the atom. That is why the scientists thought they could explain the atom.
What is Radiowaves?
The electromagnetic spectrum's longest wavelengths are those of radio waves. They might be as big as our globe or as long as a football. In the late 1880s, Heinrich Hertz provided conclusive evidence of radio waves. He employed two spark gaps: one on a receiving antenna and one on an induction coil.
Sparks would cross its gap as well as waves carried by the coil transmitter's sparks were picked up by the receiving antenna. In his investigations, Hertz demonstrated that these signals had all the characteristics of electromagnetic waves.
You may listen to your preferred music by tuning a radio to a certain wavelength, or frequency. These electromagnetic radio waves are "received" by the radio, which then transforms them into audible sound waves by causing mechanical vibrations in the speaker.
Therefore, because the radiowaves could abide by the mathematical nature of the atom, they were thought to explain the structure of the atom.
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Determine the equilibrium constant Kc and the reaction quotient Qc for a reversible reaction.
Answer:
Explanation:
The equilibrium constant (Kc) is a measure of the relative concentrations of the reactants and products at equilibrium for a given chemical reaction. It is defined as the ratio of the product concentrations raised to their stoichiometric coefficients, to the reactant concentrations raised to their stoichiometric coefficients. For a general reversible reaction
aA + bB <=> cC + dD
The equilibrium constant is defined as:
Kc = [C]^c [D]^d / [A]^a [B]^b
where [X] represents the concentration of species X (in molarity units), and the superscripts on the concentrations represent the stoichiometric coefficients of the species in the balanced equation for the reaction.
The reaction quotient (Qc) is similar to the equilibrium constant, but it is calculated using the concentrations of the reactants and products at a given point in time, rather than at equilibrium. The reaction quotient is also defined as the ratio of the product concentrations raised to their stoichiometric coefficients, to the reactant concentrations raised to their stoichiometric coefficients, and is calculated using the same equation as Kc, but with the concentrations at a specific point in time, rather than at equilibrium.
Qc = [C]^c [D]^d / [A]^a [B]^b
It can be used to predict the direction of reaction depending on the sign of Qc, Kc.
If Qc < Kc, the reaction will shift in the direction of products.
If Qc > Kc, the reaction will shift in the direction of reactants
If Qc = Kc, the reaction is at equilibrium.
If you want to know more about equilibrium reaction you can check on Le Chatelier's principle.
In terms of binding energy per nucleon, what element divides fission and fusion processes? O He
O U O Fe
O C
O H
Fe which is Iron is the element that distinguishes between fission and fusion processes in terms of binding energy per nucleon.
Since the negatively charged electrons are held in place by the electrostatic pull of the positively charged nucleus, the electron binding energy is the lowest energy needed to remove an electron from an atom. Fe element distinguishes between fission and fusion processes in terms of binding energy per nucleon. In particle physics, the term "binding energy" describes the energy an atom receives from electromagnetic interaction as well as the quantity of energy needed to break an atom down into free nucleons.
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If the actual yielsd of a reaction is 50 g and the theoretical yield is 60 g. What is the percent yield.
If the actual yield and percent yield are 51.4g and 77.0%, respectively, calculate the theoretical yield. We predicted a theoretical yield of 13 grams for the reaction of Na with Cl2.
Yield is determined by dividing the principal amount by the net realized return. Gains and returns on stock investments, for instance, can take one of two kinds. On the basis of the chemical equation's stoichiometry, theoretical yield is computed. Experimental data are used to determine the real yield. Calculating the ratio of actual yield to theoretical yield yields the percent yield. The % ratio of the theoretical yield to the actual yield is known as the percent yield. It is calculated as the theoretical yield multiplied by 100% divided by the experimental yield.
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Why do different substances have different properties?
Different substances have different properties because of the differences in their atomic and molecular structure, bonding types, and strength of their chemical bonds. These differences can be due to the number of atoms, the arrangement of atoms, and the types of electrons involved in the bonding.
The properties of elements and compounds are determined by the types and arrangements of the atoms that make up the substance. For example, water (H2O) and hydrogen peroxide (H2O2) have different properties due to their different molecular structures. Water is made up of two hydrogen atoms and one oxygen atom, while hydrogen peroxide is made up of two hydrogen atoms and two oxygen atoms. may have different characteristics. The strength of chemical bonds between atoms or molecules can be affected by the number and type of electrons involved in the bond. Because of this, some substances are more stable than others and have higher melting and boiling points.
In addition, some properties are also affected by the physical state of the material, such as solubility, density, and conductivity. These properties are determined by the strength of the intermolecular forces between the particles of the substance.
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Explain how electron micrographs such as this helped falsify the Davson-Danielli model of membrane structure
Electron micrographs aided Davson-Danielli in determining the membrane structure since they assumed the phospholipids were in between the proteins, resulting in the sandwich model.
What is electron micrographs?An picture acquired by hitting the object with a tightly focused (10 nm diameter) electron beam and measuring the transmitted, secondary, backscattered, and diffracted electrons, as well as the distinctive X-rays released. The method of electron microscopy (EM) is used to acquire high-resolution pictures of biological and non-biological material. In biomedical research, it is utilized to explore the precise structure of tissues, cells, organelles, and macromolecular complexes. Modern electron microscopes generate electron micrographs by capturing pictures with sophisticated digital cameras and frame grabbers.
Here,
Davson-Danielli was assisted in establishing the membrane structure by electron micrographs since they thought the phospholipids were in between the proteins, resulting in the sandwich model.
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Would using king size bags of M&M's make a difference to the average "atomic mass"? Why or why not?
No, because every M&M's is identical.
M&M's contain the same amount of protons, M&M's are the same hue. In other words, the size represents the various neutron counts.
Atoms of the same chemical element called isotopes each have a distinct mass number.
While isotopes can vary in mass, they never do so in atomic number (the amount of protons). You will use M&Ms to represent atoms because we are unable to see them. These objectives are use in M&Ms to determine the average atomic mass and to observe how different isotopes are.
In this the number show how many M&M's of that color and size are packed into that bags.
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A student calculated the molarity of a solution prepared by dissolving 0.730 mol of table sugar (sucrose, C12H22O11) in 1.8x10^3 mL of water as 4.06x10^-4 M C12H22O11. Explain the student's calculation error and explain how the student should solve for the correct value of molarity. Show a valid calculation for the molarity.
The student made a mistake because he did not convert a unit of volume from milliliters to liters. After all, molarity is defined as the number of moles of solute per liter of solution.
Answer: C=0.406M.C=0.406M.
The transfer of energy from one region of the atmosphere to another is of great importance in meteorology for it affects the weather. Calculate the heat needed to be supplied to a parcel of air containing 1. 00 mol air molecules to maintain its temperature at 300 K when it expands reversibly and isothermally from 22 dm3 to 30. 0 dm3 as it ascends
Energy transfer from one region of the atmosphere to another is critical in meteorology because it affects the weather.
What is Meteorology?
Meteorology is the science of studying the atmosphere and its phenomena such as weather, climate, and air pollution. It is a branch of the atmospheric sciences and studies the physical processes that make up the atmosphere and how the atmosphere affects the Earth and its inhabitants.
The amount of heat needed to be supplied to the parcel is given by the equation:
Q = nRT∆V
Where n is the number of moles of air, R is the ideal gas constant, T is the temperature in Kelvin and ∆V is the change in volume.
Therefore, the amount of heat needed to be supplied to the parcel is given by:
Q = (1.00 mol)(8.314 J/molK)(300 K)(30.0 dm3 - 22.0 dm3)
Q = 4, 573.2 J.
This is important because it demonstrates the amount of energy that must be supplied in order to keep the parcel of air at a constant temperature as it expands. Without this energy, the temperature of the parcel would decrease as it expands, resulting in a change in its weather patterns.
Hence, the amount of heat needed is: Q = 4, 573.2 J.
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what are the twenty (20) element in the periodic table
Answer:
calcium (ca)
Explanation:
Help me please I have been stuck for some time
Answer:275.4 g Al2O3
Explanation: The mass of Al2O3 formed is 2.7 mol * 102 g/mol = 275.4 g. This is because the molar mass of Al2O3 is 102 g/mol. This means that when 1 mol of Al2O3 is formed, it has a mass of 102 g. Therefore, when 2.7 mol of Al2O3 is formed, it has a mass of 2.7 mol * 102 g/mol = 275.4 g.