Answer:
[tex]1mole=6.02x10^{23} unit[/tex] (Avogadro constant)
Explanation:
It is known by the name of mole (mol) to one of the fundamental physical magnitudes that contemplate the International System of Units. This unit is used to measure the quantity of all kinds of substances present in a given system.
The mole, experts say, reflects the amount of substance that has a specific number of entities of elementary character as atoms can be found in twelve grams of carbon-12. This means that the number of elementary units (as in the case of atoms, molecules or ions, for example) that are reflected in a mole of substance is a constant that has no direct relationship with the type of particle or material in question. This amount is known as Avogadro's number.
This constant, baptized in homage to the scientist of Italian origin Amedeo Avogadro (1776-1856), allows to count microscopic particles from macroscopic measurements (as it is the case of the mass).
In chemistry, a mole consists of exactly 6.022 × 10²³ particles, which can be atoms, molecules, ions, or electrons. This quantity is known as Avogadro's number. Option A is correct.
The number of particles in a mole is a fundamental concept in chemistry, directly associated with the Avogadro's number. One mole of any substance, be it atoms, molecules, ions, or electrons, contains exactly 6.022 × 10²³ of those particles.
This specific value is selected for its utility in linking the macroscopic measurements that scientists can easily work with, to the microscopic scale of atoms and molecules which are too small to interact with directly.
This value (6.022 × 10²³) also represents the bridge between the molecular scale and the scale of chemical reactions observable and measurable in the laboratory. It's because every mole of substance, due to this number, will have a mass in grams equal to its molecular (or atomic) mass which is a direct translation of microscopic properties to macroscopic quantities that can be measured.
Hence, A. is the correct option.
The complete question is:
How many particles are in a mole?
A. 6.02 × 10²³
B. 23 × 10⁶
C. 6.02 × 23¹⁰
9. How many grams of potassium sulfate are needed to make 250 mL of a 0.150 M
potassium sulfate solution?
Answer:
6.53g of K₂SO₄
Explanation:
Formula of the compound is K₂SO₄
Given parameters:
Volume of K₂SO₄ = 250mL = 250 x 10⁻³L
= 0.25L
Concentration of K₂SO₄ = 0.15M or 0. 15mol/L
Unknown:
Mass of K₂SO₄ =?
Methods:
We use the mole concept to solve this kind of problem.
>>First, we find the number of moles using the expression below:
Number of moles= concentration x volume
Solving for number of moles:
Number of moles = 0.25 x 01.5
= 0.0375mole
>>Secondly, we use the number of moles to find the mass of K₂SO₄ needed. This can be obtained using the expression below:
Mass(g) = number of moles x molar mass
Solving:
To find the molar mass of K₂SO₄, we must know the atomic mass of each element in the compound. This can be obtained using the periodic table.
For:
K = 39g
S = 32g
O = 16g
Molar mass of K₂SO₄ = (39x2) + 32 + (16x4)
= 78 +32 + 64
= 174g/mol
Using the expression:
Mass(g) = number of moles x molar mass
Mass of K₂SO₄ = 0.0375 x 174 = 6.53g
Answer:
6.97 g
Explanation:
cK-12
16.9 Molarity
A sample of oxygen occupies 47.2 liters under a pressure of 1240 torr at 298K. What volume would it occupy at 303K if the pressure were decreased to 730 torr
Answer:
81.5 L
Explanation:
We can use the combined gas law equation that gives the relationship among pressure, temperature and volume of gases for a fixed amount of gas.
P1V1 / T1 = P2V2 / T2
where P1 - pressure, V1 - volume and T1 - temperature at the first instance
P2 - pressure, V2 - volume and T2 - temperature at the second instance
substituting the values in the equation
1240 Torr x 47.2 L / 298 K = 730 Torr x V2 / 303 K
V2 = 81.5 L
the new volume the gas would occupy when the conditions have changed is 81.5 L
The problem involves using the ideal gas law to find the volume of oxygen gas under different conditions of temperature and pressure. The initial volume of 47.2 liters at 1240 torr and 298K changes to approximately 79.4 liters when the conditions are changed to 730 torr and 303K.
Explanation:The subject of this question is the application of the ideal gas law, an equation used in physics and chemistry to calculate the properties of gases. The gas law equation is PV = nRT, where 'P' is the pressure, 'V' is the volume, 'n' is the number of moles, 'R' is the gas constant, and 'T' is the temperature. However, since the number of moles and the gas constant doesn't change in our problem, we can simplify it to P1*V1/T1 = P2*V2/T2. This equation is used to solve problems involving changes in pressure, volume, and temperature for a gas.
Given conditions: P1 = 1240 torr, V1 = 47.2 L, T1 = 298K; Required conditions: P2 = 730 torr, T2 = 303K. The volume V2 under the required conditions can be calculated by rearranging the formula to V2 = P1*V1*T2/(P2*T1).
Therefore, if you substitute the corresponding numbers into the formula, you will get V2 = 1240 torr * 47.2 L * 303K / (730 torr * 298K) which results in approximately 79.4 liters.
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Rates of chemical reactions vary. Which of the following can affect the rate of reaction among atoms or molecules?
Answer:
D. All of these
Explanation:
Reaction rate is a measure of speed of a chemical reaction.
The following factors control reaction rates:
1. Nature of the reactants
2. Concentration of the reactants or pressure if gaseous.
3. Temperature
4. Presence of catalyst
5. Sunlight
The reaction rate is directly proportional to the concentration of the reactants. For gaseous systems, the pressure is directly proportional to the concentration and so pressure can be used in place of concentration.
Temperature change has a considerable effect on reaction rates since temperature is directly proportional to the average kinetic energy of reacting particles. Generally, reaction rate varies as temperature directly. For every 10°C rise in temperature above room temperature, it has been found that reaction rates becomes double or triple.
When temperature of a reacting system increases:
I. The kinetic energy of each of the reacting particles inceases
II. The frequency of ordinary colliosions and effective collisions per unit time increases.
III. Many of the reacting particles would require energy greater than or equal to the activation energy of the reaction.
Energy travels from the sun to earth. Some of this energy is absorbed by particles in the atmosphere. The transfer of heat to particles in the atmosphere is an example of ___.
Answer:
radiation
Explanation:
Heat transfer is the process of propagating heat in different media. Three types of heat transfer are known: conduction, convection and radiation
The transfer by radiation is given at a distance. In fact, at any distance, as long as there is nothing that absorbs that energy along the way, and does not need a means to propagate.
Which statement best describes the basis of the band theory of metallic bonding?
Answer:
C
Explanation:
Atomic orbitals overlap to form molecular orbitals in which the valence electrons in the atoms travel
Convert the following tempatures to K. A) 104 C b) -3 C
Answer:
104 c = 377.15 k
-3 c = 270.15 k
Explain what needs to be done to the circuit so that the bell will make a sound
Answer:a switch
Explanation:because the electricity will go to the battery to the bell and it will make a sound
To activate the bell in the circuit, connect wire A from the battery to wire B leading to the bell, completing the circuit and allowing electric current to flow, resulting in the bell producing sound vibrations.
To make the bell sound in the circuit:
1. Connect wire A, currently attached to the battery, to wire B, which is connected to the bell.
2. This will complete the circuit and allow the electric current to flow continuously from the battery through the bell.
3. When the circuit is closed by connecting wires A and B, the electric current will pass through the bell, causing it to vibrate and produce a sound.
4. The completion of the circuit enables the electrical energy to power the bell, resulting in its functionality and the production of sound.
PLEASE HURRY WILL MARK BRAINLIEST
Of the planets listed, which planet is closes to the sun?
A. Saturn
B. Uranus (hehe)
C. Jupiter
D. Neptune
Answer:
C.) Jupiter
LOL ^_^
Explanation:
Answer: C) Jupiter
Explanation:
What light color passes through the atmosphere and refracts toward the moon? A. Orange B. Blue C. Red D. Green
Red color passes through the atmosphere and refracts toward the moon
Further explanationWhat light color passes through the atmosphere and refracts toward the moon?
A. Green B. Blue C. Orange D. RedRed light color passes through the atmosphere and refracts toward the moon.
The straight red arrow passing from the surface through the atmosphere represents the fraction of the emitted infrared radiation that passes into space through the atmosphere without change. Red-colored light is scattered very little. However it is refracted or bent inward towards the Moon. Red light that hits the Moon is reflected back toward Earth, therefore we see the Moon glowing red during totality.
Red is the color at the end of the visible spectrum of light. It is next to orange and opposite violet. It has a dominant wavelength of approximately 625–740 nanometres. Red is a primary color in the RGB color model and the CMYK color model, and is the complementary color of cyan.
Hope it helps!
Learn moreLearn more about the atmosphere https://brainly.com/question/9566580Learn more about the moon https://brainly.com/question/8581626Learn more about light color https://brainly.com/question/9090729Answer details
Grade: 9
Subject: chemistry
Chapter: color
Keywords: the atmosphere, the moon, light color, refracts, Orange
Answer:
C. RED
Just took the test and got it right.
Explanation:
What is a salt? A compound formed from a(n) ____ from an acid and a(n) ____ from a base.
A salt is an ionic compound produced from the combination of a cation from a base and an anion from an acid, often during a neutralization reaction.
A salt is an ionic compound formed when an acid and a base neutralize each other. This chemical reaction typically produces a salt and water as products. In the reaction, a positive ion or cation from the base combines with a negative ion or anion from the acid. An example of this process is the formation of sodium chloride (NaCl), where sodium ions (Na+) from sodium hydroxide (NaOH) react with chloride ions (Cl-) from hydrochloric acid (HCl), resulting in table salt, NaCl.
The general equation for a reaction between an acid and a base is: acid + base → water + salt
Salts can be formed from these reactions even if the solution is not neutral; they can be either acidic or basic, depending on the strengths of the original acid and base. It's noteworthy that the term neutralization reaction is often used to describe the process, as it typically involves the neutralization of the acid and base properties.
4. What electrons are involved in chemical bonding?
Answer:
The electrons that participate in chemical bonds are the valence electrons, which are the electrons found in an atom 's outermost shell.
Explanation:
Chemical bonding involves valence electrons, the electrons in an atom's outermost shell. There are two main types of bonds: ionic, which involves electron transfer, and covalent, which involves electron sharing.
Explanation:In the context of chemical bonding, the electrons involved are the ones located in the outermost shell of an atom, called the valence electrons. An atom's chemical behavior and its propensity to form bonds are determined by its valence electrons. There are two main types of chemical bonds: ionic bonds and covalent bonds.
In ionic bonding, electrons are transferred from one atom (turning it into a positively charged ion, or cation) to another (turning it into a negatively charged ion, or anion). This results in an electrostatic attraction between the ions, forming an ionic bond.
Covalent bonding, on the other hand, involves the sharing of valence electrons between atoms. This can result in single, double, or triple bonds based on how many electron pairs are shared: two electrons for a single bond, four for a double bond, and six for a triple bond.
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Scientific theories and scientific laws are both based on extensive observations, experimentation, and reasoning. What is the primary factor that distinguishes scientific laws from scientific theories?
A. Scientific laws have been observed without exception in specific conditions.
B. Scientific laws frequently change over time.
C. Scientific laws tend to be conceptual and rarely use mathematics.
D. Scientific laws are always true, even when conditions change.
Answer:
Explanation:
Scientific laws have been observed without exception in specific conditions.
Answer:
Scientific laws have been observed without exception in specific conditions.
Explanation:
study island :)
Electronegativity difference of N and H
Nitrogen has an electronegativity of 3.0 whereas hydrogen is 2.1 based on the Pauling scale. Therefore nitrogen is very electronegative and more electronegative than hydrogen
Electronegativity difference of N and H is 0.9
Covalent
explain why the first ionization energy of krypton is greater than the first ionization energy of bromine
Answer:
The atomic radius of krypton is similar to that of bromine. However, the effective nuclear charge of krypton is greater than that of bromine.
Explanation:
Ionizing an atom require moving an electron from the electron cloud of the atom to a point infinitely far away from the atom. The first ionization energy of this atom is the energy change in this process.
The electron and the nucleus are oppositely-charged. There is an electrostatic force between the two. Removing the electron requires overcoming this attraction. The size of the energy input depends on the electrostatic potential energy of the electron (the gravitational potential energy is much smaller than the electrostatic potential energy.) The separation between the electron and the nucleus is much larger than their radii. Both objects can be considered as point charges. Coulomb's Law gives the electrostatic potential energy of the two point charge that are close to each other.
[tex]\displaystyle \text{Electrostatic Potential Energy} = -\frac{k\cdot (q_1\cdot q_2)}{r}[/tex],
where
[tex]k[/tex] is Coulomb's constant,[tex]q_1[/tex] and [tex]q_2[/tex] are the two charges, and[tex]r[/tex] is the separation between the two charges.Krypton and bromine are right next to each other in the same period. Their atomic radii will be similar to each other. The separation [tex]r[/tex] between the outermost electron and the nucleus will also be similar for the two elements.
The first charge [tex]q_1[/tex] can be the electron. However, data show that for elements after helium, the second charge [tex]q_2[/tex] is smaller than the sum of charges on all protons in the nucleus. It turns out that the inner shell electrons (all of which are also negative) repel electrons in the outermost valence shell. The effective nuclear charge [tex]Z_\text{eff}[/tex] of a neutral atom is approximately the same as the number of protons minus the number of non-valence electrons. That number will be slightly larger for krypton than for bromine. As a result, the electrostatic potential energy on a 4p (the outermost orbital for both Kr and Br) electron of krypton will be more negative than that on a 4p electron in bromine. Removing that electron will take more energy in Kr than in Br. The first ionization energy of Kr is hence greater than that of Br.
Answer:
because if krypton has more protons, therefore it has a greater nuclear charge so the electron is harder to remove.
Explanation:
a _____ is the location of an object.
Answer:
Coordinate
Explanation:
It comes in a set of values (x,y) in two dimensions or (x,y,z) in three dimensions. Coordinates are useful in many applications such as tracking planes in the air and also in the military in precision strikes. GPS also used coordinates to describe the location of a particular feature.
In physics, position refers to the location of an object, described relative to a frame of reference. Displacement is the change in position and includes both the straight line distance and the direction of motion. Understanding these concepts is key to studying the motion of objects.
Explanation:Position
To describe the motion of an object, you must first be able to describe its position (x): where it is at any particular time. A frame of reference is an arbitrary set of axes from which the position and motion of an object are described. Earth is often used as a frame of reference, or other reference frames in motion relative to Earth. The displacement of an object is the change in its position, which includes the straight line distance and the direction of its motion between initial and final positions.
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consider the following reversible reaction. C(s) + O2(g) CO2 (g) what is the equilibrium constant expression for the given system
Answer:
Equilibrium constant expression is the ratio of product of concentration of products and product of concentration of reactants.
Here K= [CO2]/[O2]
Note: Solids won't contribute to equilibrium constant expression since their activity is always one.
Answer:
B.)
Explanation:
What is the systematic name of of Na2O
Answer: sodium oxide
Explanation:
Answer:
sodium oxide
Explanation:
What might cause the average temperature of Earth to increase?
Plato users: increased levels of carbon dioxide from burning fossil fuels
Answer:
Explanation:
increased levels of carbon dioxide from burning fossil fuels
Fossil fuels release carbon dioxide into the atmosphere. The burning of fossils shoots up carbon emission and leads to gloabl warming.
Carbondioxide is one of the greenhouse gases. Others are methane, water vapour.
Incoming radiation that reaches the surface can either be reflected or be absorbed on the earth surface. The part that is absorbed helps keep surface temperature in check. The reflected component of the radiation can get trapped when they come in contact with greenhouse gases like carbondioxie. The gas prevents the radiation from escaping the earth.
As the radiation lingers, it shoots up the earth temperature significantly.
The more the gases in the atmosphere the more the temperature rises.
Carbondioxide emission from various sources, chief of which is through burning of fossil fuels in industrial processes and automobiles have become a global problem.
When the earth warms, polar ice would recede and add more water to hydrosphere. This has been one of the leading cause of the increasing level of inundation the earth has been plagued with over the years.
What is the difference between a liquid and a gas
Answer:
The molecules of the gas has more kinetic energy and has a lot of space between them. The molecules in the liquid moves slower than gas and has a tighter space than gas. Another difference is liquid takes up the shape of its container while gas does not. Cause its air.
Silver nitrate, AgNO3, can be used to test for the presence of chloride ions in solution, because it readily forms a precipitate of AgCl. What volume of 1.5 M AgNO3 will be required to react with 30.0 mL of a 0.45 M HCl solution?
Answer:
[tex]\boxed{\text{9.0 mL}}[/tex]
Explanation:
1. Write the balanced chemical equation.
AgNO₃ + HCl ⟶ AgCl + HNO₃
2. Calculate the moles of HCl
[tex]\text{Moles of HCl} =\text{30.0 mL HCl} \times \dfrac{\text{0.45 mmol HCl}}{\text{1 mL HCl}} = \text{13.5 mmol HCl}[/tex]
3. Calculate the moles of AgNO₃.
[tex]\text{Moles of AgNO}_{3} =\text{13.5 mmol HCl} \times \dfrac{\text{1 mmol AgNO}_{3}}{\text{1 mmol HCl}} = \text{13.5 mmol AgNO}_{3}[/tex]
4. Calculate the volume of AgNO₃
[tex]c = \text{13.5 mmol AgNO}_{3} \times \dfrac{\text{1 mL AgNO}_{3}}{\text{1.5 mmol AgNO}_{3}} = \text{9.0 mL AgNO}_{3}[/tex]
The titration will require [tex]\boxed{\textbf{9.0 mL}}[/tex] of AgNO₃.
Final answer:
To find the volume of 1.5 M AgNO3 required to react with 30.0 mL of a 0.45 M HCl solution, we can use the balanced equation. First, calculate the moles of HCl using volume × concentration. Then, calculate the volume of 1.5 M AgNO3 using the formula: moles ÷ concentration.
Explanation:
To find the volume of 1.5 M AgNO3 required to react with 30.0 mL of a 0.45 M HCl solution, we can use the balanced equation:
AgNO3 (aq) + HCl (aq) → AgCl (s) + HNO3 (aq)
First, we need to calculate the moles of HCl:
Moles of HCl = volume (L) × concentration (M)
Moles of HCl = 0.030 L × 0.45 M = 0.0135 mol
According to the balanced equation, 1 mole of HCl reacts with 1 mole of AgNO3. Therefore, we need 0.0135 mol of AgNO3.
Next, we can calculate the volume of 1.5 M AgNO3 using the formula:
Volume (L) = moles ÷ concentration (M)
Volume (L) = 0.0135 mol ÷ 1.5 M = 0.009 L = 9.0 mL
True or false....
A tornado is a funnel cloud that has touched the ground.
Answer:
True
Explanation:
A tornado is a funnel cloud that has touched the ground.
When a funnel cloud reaches the ground it is called a tornado.
A funnel cloud is a rotating cone-shaped column of air extending downward from the base of a thunderstorm.
Given the following thermodynamic data, calculate the lattice energy of LiCl:
Delta;H°f[LiCl(s)] = -409 kJ/mol
ΔH°sublimation [Li] = 161 kJ/mol
Bond energy [Cl-Cl] = 243 kJ/mol
IE1 (Li) = 520 kJ/mol
EA1 (Cl) = -349 kJ/mol
Answer:
[tex]\boxed{\text{-862 kJ/mol}}[/tex]
Explanation:
One way to calculate the lattice energy is to use Hess's Law.
The lattice energy U is the energy released when the gaseous ions combine to form a solid ionic crystal:
Li⁺(g) + Cl⁻(g) ⟶ LiCl(s); U = ?
We must generate this reaction rom the equations given.
(1) Li(s) + ½Cl₂ (g) ⟶ LiCl(s); ΔHf° = -409 kJ·mol⁻¹
(2) Li(s) ⟶ Li(g); ΔHsub = 161 kJ·mol⁻¹
(3) Cl₂(g) ⟶ 2Cl(g) BE = 243 kJ·mol⁻¹
(4) Li(g) ⟶Li⁺(g) +e⁻ IE₁ = 520 kJ·mol⁻¹
(5) Cl(g) + e⁻ ⟶ Cl⁻(g) EA₁ = -349 kJ·mol⁻¹
Now, we put these equations together to get the lattice energy.
E/kJ
(5) Li⁺(g) +e⁻ ⟶ Li(g) 520
(6) Li(g) ⟶ Li(s) -161
(7) Li(s) + ½Cl₂(g) ⟶ LiCl(s) -409
(8) Cl(g) ⟶ ½Cl₂(g) -121.5
(9) Cl⁻(g) ⟶ Cl(g) + e⁻ +349
Li⁺(g) + Cl⁻(g) ⟶ LiCl(s) -862
The lattice energy of LiCl is [tex]\boxed{\textbf{-862 kJ/mol}}[/tex].
Using the Born-Haber cycle and the provided thermodynamic data, the lattice energy of LiCl is calculated to be -1282 kJ/mol.
Explanation:The lattice energy of a compound is the energy required to break apart the compound into its constituent ions. It can be calculated using Born-Haber cycle, Hess’s Law and the given thermodynamic data.
ΔH°f[LiCl(s)] = Bond energy [Cl-Cl] + IE1 (Li) - EA1 (Cl) + ΔH°sublimation [Li] + Lattice energy
So, solving for Lattice Energy gives: Lattice energy = ΔH°f[LiCl(s)] - Bond energy [Cl-Cl] - IE1 (Li) + EA1 (Cl) - ΔH°sublimation [Li].
Substituting in the provided values gives: Lattice energy = -409 kJ/mol - 243 kJ/mol - 520 kJ/mol + (-349 kJ/mol) - 161 kJ/mol = -1282 kJ/mol. Therefore, the Lattice Energy of LiCl is -1282 kJ/mol.
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Which best describes a chain reaction associated with a nuclear reaction?
neutrons released during a fission reaction cause other nuclei to split. If this is an option
Answer:
A, Neutrons released during a fusion reaction cause other nuclei to fuse.
Explanation:
The neutron released in the nuclear reaction collides with other nuclei, and so on and so forth.
which of the following best describes the process of hydration?
A. water transports weathered sediment from one place and deposits it in another
B. Water moving through soil carries away important nutrients
C. Water breaks existing bonds among elements in the minerals that make up a rock
D. water bonds with elements in the minerals that make up rock, forming new substances
Answer:
The correct answer is option D, that is, water bonds with elements in the minerals that make up rock, forming new substances.
Explanation:
A hydration reaction in chemistry refers to a chemical reaction in which a substance associates with water. In the process of weathering hydration takes place when a mineral captivates water to produce a novel substance. Hydration makes the rock to increase in volume that can impart tension on the rock and make it more susceptible to other kinds of weathering processes. The two prime illustrations of hydration comprise the formation of limonite from hematite and the formation of gypsum from anhydrite.
Answer:
D. water bonds with elements in the minerals that make up rock, forming new substances.
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How much heat energy is absorbed when 41.5g of ice melts at STP? (Picture Attached)
Answer:
= 13.857 kJ
Explanation:
The heat required to melt ice from its solid state to water or liquid states without change in temperature is given by the formula;
Heat = mLf ; where m is the mass of ice and Lf is the latent heat of fusion,
The mass of ice in moles = 41.5 g/18 g
= 2.306 moles
Therefore;
Heat = 2.306 moles × 6.009 kJ/mol
= 13.857 kJ
Which of the following is NOT an Jovian planet?
A. Earth
B. Saturn
C. Neptune
D. Uranus
Answer:
Earth
Explanation:
A Jovian Planet is a gas giant, the term is derived from Jupiter which describes the three other gas giants in the Solar System as Jupiter-like. So Jupiter, Saturn, Uranus and Neptune are the only considered Jovian Planets.
The term Jovian planets refers to the gas or ice giants in our Solar System, including Jupiter, Saturn, Uranus, and Neptune. Therefore, Earth, which is a terrestrial planet, is not a Jovian planet.
The term Jovian planets typically refers to the giant outer planets in our Solar System, which include Jupiter, Saturn, Uranus, and Neptune. These planets are often called the gas giants or ice giants because of their large sizes and gas or ice-rich compositions. From the given options; Saturn, Neptune, and Uranus are part of the four Jovian planets. Therefore, Earth is not a Jovian planet. Instead, Earth is considered a terrestrial planet, which means it's primarily composed of rock and metal and has a solid surface.
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The diagram above depicts an energy releasing process involving the uranium atom. Which form of energy does this process depict?
A)
nuclear energy
B)
magnetic energy
C)
electrical energy
D)
hydroelectric energy
A nuclear energy is the answer
The diagram above depicts an energy releasing process involving the uranium atom,Nuclear energy is the form of energy that the process depict.
What is Nuclear energy?Nuclear energy is the energy in the nucleus, or core, of an atom. Nuclear energy can be used to create electricity, but it must first be released from the atom. Nuclear power can be obtained from nuclear fission, nuclear decay and nuclear fusion reactions. An example of nuclear energy is the electricity generated by a nuclear reactor, which is the major power source used in Japan.Nuclear energy is the form of energy that depict from the time of above mentioned process.
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PLZ HELP ME!!! I'll give brainliest to whoever answers this along with 15 points!
Talc
(asphalt)
gypsum
(fingernail)
calcite
(copper coin)
fluorite
apatite
(knife blade)
feldspar
(steel file)
quartz
topaz
corundum
diamond
Which of the substances listed above are pure elements?
I would say diamond, because it consists only of carbon
Select the correct answer. Which is the most electronegative element? A. nitrogen B. fluorine C. sodium D. cesium E. hydrogen
Answer:
fluorine
Explanation:
fluorine is considered the most electronegative element
Final answer:
The correct answer is "flourine". The most electronegative element is fluorine due to its position at the top right of the periodic table and its electron configuration which is one electron short of a full octet.
Explanation:
The most electronegative element is fluorine. Electronegativity is a measure of an atom's ability to attract and hold onto electrons. In the periodic table, electronegativity increases as you move from left to right across a period and decreases as you move down a group. Therefore, fluorine, which is positioned at the top right of the periodic table (aside from the noble gases), exhibits the highest electronegativity.
Fluorine's high electronegativity is attributed to its atomic electron configuration of 1s² 2s² 2p⁵, making it one electron short of a full octet. This drives its strong tendency to gain electrons from other elements, making it a very strong oxidizing agent. In comparison, hydrogen, while being more electronegative than many other elements, such as carbon, does not approach the electronegativity of fluorine.
Thus, the correct answer to the question is B. fluorine.
Solutions are formed by_____.
a solution is two substances that are evenly mixed together. One of them is called the solute and the other is the solvent. A solute is the substance to be dissolved (ex: sugar). The solvent is the one doing the dissolving (ex: water).
i learned this in science last year i hope this helped :)
Answer: A solution is made when one substance called the solute “dissolves” into another substance called the solvent.
Explanation:
Dissolving is when the solute breaks up from a larger crystal of molecules into much smaller groups or individual molecules. They do this by pulling away the ions and then surrounding the salt molecules.