The roentgen equivalent man or rem is the radiation unit which is determined by the quality factor QF.
Hence, the correct option is option c. rem
The roentgen equivalent man or rem is basically a CGS unit of equivalent dose, effective dose, as well as committed dose, which are basically the dose measures which are used to estimate potential health effects of the low levels of ionizing radiations on the human body.
Quantities measured in rem are designed such that they represent the stochastic biological risk of ionizing radiation, which is mainly the radiation-induced cancer. These quantities are derived from the absorbed dose, which has the unit rad. rem is determined by the QF or the quality factor.
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if a copper pipe requires 6.7 j to raise its temperature by 1 °c, what is the quantity of heat required to raise the temperature from 25°c to 29°c?
If the copper pipe will requires 6.7 J to raise the temperature by 1 °C, The quantity of the heat required to raise the temperature from 25 °C to 29 °C is 26.7 J.
The heat = 6.7 J
The change in temperature = 1 °C
The specific heat of copper = 0.385 J/ g °C
The specific heat is given as :
q = mc ΔT
m = q / c ΔT
m = 6.7 / ( 0.385 × 1 )
m = 17.4 g
The change in the temperature = 29 - 25 = 4 °C
The heat to raise the temperature by 4 °C :
q = mc ΔT
q = 17.4 g × 0.385 J/ g °C × 4 °C
q = 26.7 J
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hich of the following statements about subatomic particles are false? i. neutrons reside inside of the nucleus. ii. the atomic number is equal to the number of neutrons in the nucleus of an atom. iii. electrons are more massive than protons.
The atomic number is equal to the number of neutrons in the nucleus of an atom and the electrons are more massive than protons are the false statement about subatomic particles.
A sub-atomic particle is a particle which comprises an atom. Electrons, protons and neutrons collectively are called as the sub-atomic particles that form an atom. An electron is a negatively charged sub-atomic particle which revolves around the nucleus, whereas the Proton is a positively charged sub-atomic particle. On the other hand, a neutron is a neutral sub-atomic particle. James Chadwick was the first to discover the presence of the neutrons inside an atom in 1932. Neutrons as well as protons are collectively called as nucleons.
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what is the usable range of a p-1000 rainin pipetman?
200 µl and 1000 µl is the usable range of a p-1000 pipette in the laboratory.
Often employed as a media dispenser, a pipette is a typical laboratory instrument in the fields of chemistry, biology, and medicine that transports a predetermined volume of liquid.
An instrument called a pipette is used in laboratories to measure out or dispense tiny amounts of liquid in milliliters (mL) or microliters (L) volumes. The word "pipette," which means "little pipe" in French, is where the name "pipette" originates. There are three main types of pipettes: glass, plastic, and electronic in the laboratory.
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Explain the differences between how a scientist and a pseudoscientist would try to test a new medicine.
Pseudoscientists attempt to make unfalsifiable or untestable statements in science, while scientists strive to formulate falsifiable, research theories. This is the main difference between them.
What benefits and drawbacks does pseudoscience offer?People are persuaded to believe whatever they want to via pseudoscience. It offers phony "arguments" to deceive you into believing that all opinions are equally valid. Let's set aside the things we think to be true and carry out an investigation instead, says science.
A pseudoscience is what?A pseudoscience is a made-up knowledge field that bases its statements on flawed or unavailable scientific data. The majority of the time, these pseudoscience make statements that look convincing but have little to no empirical evidence.
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student is working with a flammable material, which while being heated suddenly ignites. which of the given choices is the best way to extinguish the fire contained completely within a beaker?
The best way to extinguish a fire contained completely within a beaker would be to use a fire blanket or a fire extinguisher with a Class B rating (for flammable liquids). It's important to never try to extinguish a fire with water, as this can cause the flammable material to splash and spread the fire.
Use the fire extinguisher provided in the lab.
Water Mist Fire Extinguishers - For use on General Risks including Cooking Media.[tex]CO_{2}[/tex] Fire Extinguishers - For use on Electrical Risks. Metal Fire Extinguisher - Applied to Flammable Metal Risks.Flammable metal laboratories must have a suitable Class D fire extinguisher in the lab to put out a fire caused by a combustible metal. Safety considerations: Verbally warn building inhabitants and sound the fire alarm if the fire is big or spreading.
If the fire is contained in a beaker or other small vessel, it can frequently be put out by adding sand or dry ice, covering the vessel with wire gauze, or both.
Therefore, the best way to extinguish a fire contained completely within a beaker would be to use a fire blanket or a fire extinguisher with a Class B rating (for flammable liquids).
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if you increase extracellular k which is true
Answer: a transient loss of activity that was not due to depolarization block, followed by a rapid increase in excitability and recovery of spiking within minutes.
Explanation:
The following propositions are true when extracellular potassium (K+) concentration is increased:
The resting membrane potential becomes more positive: Because potassium ions are positively charged, as extracellular potassium levels rise, the resting membrane potential rises due to the flow of K+ ions out of the cell.
Increased extracellular potassium causes neurons to become more excitable and prone to firing, which can result in muscular contractions, changes in heart rate, or other physiological reactions.
Changes in muscular contraction: An increase in extracellular potassium can impact muscle contraction by affecting muscle fiber excitability, resulting in changes in muscle tone and strength.
What is concentration?The amount of a material, such as salt, that is present in a certain amount of tissue or liquid, such as blood. When there is less water present, a material becomes more concentrated. A solution's concentration is a measure of how much solute has been dissolved in a given quantity of solvent or solution. A concentrated solution contains a significant amount of dissolved solute. A dilute solution is one with a little quantity of dissolved solute.
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Reaction stoichiometry is based on chemical equations and: _______
Reaction stoichiometry is based on chemical equations and the law of conservation of mass.
Reaction stoichiometry is the study of the quantitative relationships between reactants and products in a chemical reaction. It is based on the chemical equation, which shows the number of moles of each substance involved in the reaction and how they are related. This information is used to determine the amount of product that can be produced from a given amount of reactant, or to find the amount of reactant required to produce a certain amount of product.
By using the balanced chemical equation, reaction stoichiometry enables us to perform quantitative predictions and analysis of chemical reactions and is an important tool for chemical engineering, materials science, and many other fields.
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what two reasons can be made for the molecular ion peak at m/z = 130 being so weak?
Low abundance: The molecular ion peak at m/z = 130 may be weak due to its low abundance in the sample being analyzed.
This can be due to a number of reasons, including low levels of the analyte in the sample, limited ionization efficiency, or interference from other ions in the spectrum.
Fragmentation: Another reason for the weakness of the molecular ion peak at m/z = 130 could be due to extensive fragmentation during the mass spectrometric analysis. Fragmentation occurs when the analyte molecule undergoes a collision-induced dissociation, resulting in the formation of smaller, fragmented ions. This can cause the abundance of the molecular ion to decrease, making the peak weaker in the mass spectrum. Low abundance: The molecular ion peak at m/z = 130 may be weak due to its low abundance in the sample being analyzed.
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Which statement is correct about the theory of combustion?
1. The law of conservation of mass provided justification for the theory of combustion.
2. The theory of phlogiston provided justification for the theory of combustion.
3. • The theory of phlogiston became the theory of combustion.
4. • The law of conservation of mass became the theory of combustion.
B
The phlogiston theory states that as something burns, it dephlogisticates and releases stored phlogiston, which the air then absorbs. Because growing plants absorb the phlogiston, neither plant materials nor air spontaneously catch fire.
Thus, Phlogiston explained burning in a way that was totally at odds with the hypothesis of oxygen.
Phlogiston-rich substances frequently burnt in the presence of air; the fact that combustion abruptly stopped in a closed atmosphere was taken as indisputable evidence that there was a limit to the amount of phlogiston that air could carry. A metal heated in phlogisticated air couldn't form a calx or sustain life in any way. Phlogisticated air was incapable of supporting the burning of any material. When breathing, phlogiston was thought to be ejected from the body.
Calculate the energy (in J) for one photon of this radiation.
(Include Sig figs and unit)
The energy of the photon is 4 * 10^-19 J.
What is the energy of the photon?We have to note that the energy of the photon can be obtained by the application of the formula that connects the wavelength to the energy.
We have to note that;
E = hc/λ
E = energy of the photon
h = Plank's constant
c = speed of light
λ = Wavelength
We then have that;
E = 6.6 * 10^-34 * 3 * 10^8/488 * 10^-9
E = 4 * 10^-19 J
From the calculation, we have the energy of the photon as 4 * 10^-19 J here.
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what is the magnitude of the charge of the electrons in 6.20 mol of neutral molecular-hydrogen gas (h2)?
The magnitude of the charge of the electrons in 6.20 mol of neutral molecular-hydrogen gas is 119.48 × 10⁴ C.
There are two electrons and two protons in a hydrogen molecule (H₂).
Total no. of electrons present in 1 mol of hydrogen molecule (H₂) is given as,
n = 2 × 6.022 × 10²³
Total no. of electrons present in 6.2 mol of hydrogen molecule (H₂) is given as,
n = 2 × 6.2 × 6.022 × 10²³
By the formula of quantization of charge we get,
q = ne
Substituting the values we get,
q = 2 × 6.2 × 6.022 × 10²³ × 1.6 × 10⁻¹⁹ C
⇒ q = 119.48 × 10⁴ C
Hence, the magnitude of the charge of the electrons in 6.20 mol of neutral molecular-hydrogen gas is 119.48 × 10⁴ C.
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how can 100. ml of sodium hydroxide solution with a ph of 13.00 be converted to a sodium hydroxide solution with a ph of 12.00 ? responses
To convert 100 ml of sodium hydroxide solution with a pH of 13.00 to a sodium hydroxide solution with a pH of 12.00, one method would be to dilute the solution with distilled water.
By diluting the solution, the concentration of hydroxide ions (OH-) will decrease, thus reducing the pH of the solution. The exact amount of distilled water needed to reach a pH of 12.00 will depend on the original concentration of the sodium hydroxide solution. However, you can add small amounts of distilled water to the solution and measure the pH after each addition until the desired pH is reached. It's important to note that the conversion of sodium hydroxide solution from pH 13.00 to 12.00 involves a significant decrease in the concentration of hydroxide ions, and care should be taken when handling strong alkaline solutions.
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How many molecules of aspirin are contained in a 100.0 g tablet of aspirin, C9H8O4?
3.34×10³⁰ aspirin C9H8O4 molecules make up a 100.0 mg aspirin pill.
Describe aspirin.Aspirin, also known as acetylsalicylic acid, is a neutral anti-inflammatory drug used to treat pain, fever, and/or inflammation as well as being a blood thinner. Inflammatory conditions including Kawasaki illness, pericarditis, & rheumatic fever are all treated with aspirin.
C₉H₈O₄ → ( 12 × 9 ) + ( 1 × 8 ) + ( 16 × 4 )
= 180 g/mol
Then convert the mass from g to mg → 180 g × 1000 mg/1g
= 180000 mg
= 1.8×10⁵ mg
In 1.8×10⁵ mg of aspirin ( 1 mol )
we have 6.02 × 10²³ molecules
In 100 mg of aspirin,
we have ( 100 . 6.02 × 10³ ) / 1.8 × 10⁵
= 3.34 × 10³⁰ molecules
A 100.0 mg aspirin pill therefore has 3.34 × 10³⁰molecules of aspirin C9H8O4.
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why is 2-cyclopenten-1-one more basic than cyclopentanone
2-Cyclopenten-1-one is more basic than cyclopentanone due to the presence of a double bond in the former.
The double bond in 2-cyclopenten-1-one can act as a source of electrons, making it a better electron-donor and therefore a stronger base. On the other hand, cyclopentanone is a ketone and has a carbonyl functional group, which is a strong electron-withdrawing group and therefore makes it a weaker base. The electron-donating ability of 2-cyclopenten-1-one is further increased due to the electron-withdrawing effect of the carbonyl group being reduced in 2-cyclopenten-1-one compared to cyclopentanone. This difference in basicity between the two compounds can be used to explain the different reactivity patterns of the two compounds in various chemical reactions.
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Click Reset Balloon. Choose the button that shows two balloons. Move each balloon over the sweater so that half of the sweater’s electrons move to one balloon and half of the electrons move to the other balloon. Try to bring the balloons close together. What happens to the balloons?
If you bring the two balloons close together, they would experience a force of attraction. This is because like charges would repel each other, while opposite charges attract each other. The balloons would experience an electric force, which would cause them to move towards each other.
What do you mean by electrostatic force?Electrostatic force is a type of force that occurs between charged particles. It is a fundamental force of nature that arises from the interaction between charged objects.
How do electrostatic force play an important role?The electrostatic force plays a crucial role in many natural phenomena, such as the behavior of charged particles in electric and magnetic fields, the formation of lightning, and the behavior of colloidal suspensions. In technology, the electrostatic force is used in many applications, such as electrostatic precipitators, electrostatic spraying, and electrophoresis.
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Answer:
The balloons move away from each other.
Explanation:
This is 100% Correct
What describes the structure of covalent network solids?
Covalent network solids are characterized by a continuous, interconnected network of atoms held together by strong covalent bonds, forming a rigid and strong solid.
Covalent network solids are solids in which the atoms are bonded together by covalent bonds to form an extended three-dimensional network. In this type of solid, the atoms are held together by strong covalent bonds, forming a continuous, interconnected lattice. The covalent bonds are directional and typically involve sharing of electrons between neighboring atoms.
Examples of covalent network solids include diamond and silicon dioxide (silica). In these materials, the covalent bonds form tetrahedral arrangements, which result in strong and rigid solids. The high strength and low volatility of covalent network solids make them useful for high-temperature and high-pressure applications, as well as for optical and electronic applications.
In summary, covalent network solids are characterized by a continuous, interconnected network of atoms held together by strong covalent bonds, forming a rigid and strong solid.
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If 7.27 moles of NaCl are reacted with excess Pb(NO3)2 according to the following equation, how many moles of PbCl2 will be produced?
Answer:
if you need steps let me know but I think its 0.84 molecules
Explanation:
What is the pH of the solution that results from adding 25 mL of 0.33 M HCl to 25 mL of 0.58 M NH3? (Kb for NH3 = 1.8 x 10-5)
The pH of the solution that results from adding 25 mL of 0.33 M HCl to 25 mL of 0.58 M NH3 cannot be calculated precisely without knowing the exact concentration of the final solution.
When HCl and NH3 are mixed, they react to form a neutralization reaction, producing NH4+ and Cl- ions. The exact concentration of the final solution depends on the stoichiometry of the reaction, which in turn depends on the relative concentrations of the reactants and the product.
To determine the pH of the solution, it would be necessary to first calculate the concentration of the NH4+ ions produced in the reaction and then use the concentration to calculate the equilibrium concentration of NH3 and H+. The pH of the solution can then be determined using the definition of pH as -log[H+]. However, due to the complex nature of the reaction, it is not possible to calculate the exact pH of the solution without performing the reaction and measuring the concentration of the components.
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How many electrons are there in one atom of element X?
An element Y's atom has 11 protons, 11 electrons, and 12 neutrons compared to an element X's atom's 17 protons, 17 electrons, and 18 neutrons.
What does X element mean?A unique representation of an isotope of any element is AZX, where X is the element's atomic symbol, A is the mass number, and Z is the atomic number. 126C is the carbon isotope with the most neutrons.It also has the same mass as how many hydrogen atoms join with one of it. One X atom joins four hydrogen atoms to form the XH4 molecule. As a result, X has a valency of 4. The atomic number and mass number of an element can be used to identify it. Isotopes are different-mass versions of the same element's atoms. The number of protons and neutrons in an atom's nucleus has a significant role in determining an atom's mass.To learn more about element refer to:
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2 03(g) → 3 0₂(8) AH=-285 kJ/mol,
The bond enthalpy of the oxygen-oxygen bond in O, is 498 kJ/mol. Based on the enthalpy of the reaction represented above, what is the average bond enthalpy, in kJ/mol, of an oxygen-oxygen bond in 03?
Please help meee
The average bond enthalpy, in kJ/mol, of an oxygen-oxygen bond in O[tex]_3[/tex] is 889.5kJ/mol. Bond enthalpy, sometimes referred to as binding energies.
What is bond enthalpy?Bond enthalpy, sometimes referred to as binding energies, is a number that sheds light on the potency and, consequently, the stability of a chemical bond. The total energy required for breaking 1 mole of a chemical bond is known as that of the bond enthalpy of the that chemical bond.
2O[tex]_3[/tex](g) → 3O[tex]_2[/tex], ΔH=-285 kJ/mol
enthalpy of reaction = 3×bond enthalpy of O[tex]_2[/tex] - 2×bond enthalpy of O[tex]_3[/tex]
-285 =3×498 - 2×bond enthalpy of O[tex]_3[/tex]
-285 = 1494- 2×bond enthalpy of O[tex]_3[/tex]
-285-1494= - 2×bond enthalpy of O[tex]_3[/tex]
-1779 = - 2×bond enthalpy of O[tex]_3[/tex]
bond enthalpy of O[tex]_3[/tex] =1779/2=889.5kJ/mol
Therefore, the average bond enthalpy, in kJ/mol, of an oxygen-oxygen bond in O[tex]_3[/tex] is 889.5kJ/mol.
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suppose that at the end of reaction 1 the level of the aqueous solution were 26 cm higher inside the buret than outside. compared to ambient pressure, the pressure of the gas inside the buret would be:
Answer:
The pressure of the gas inside the buret would be higher than ambient pressure if the level of the aqueous solution were 26 cm higher inside the buret than outside.
This is because the gas inside the buret is being compressed by the weight of the liquid column above it. The higher the liquid column, the greater the pressure on the gas. So when the level of the aqueous solution is 26 cm higher inside the buret than outside, it means that there is a greater weight of liquid pushing down on the gas, which increases the pressure of the gas.
It's important to note that the pressure inside the buret is not only due to the liquid column but also due to the atmospheric pressure. So the pressure of the gas inside the buret will be higher than ambient pressure but not only by 26cm of liquid column.
outline ways in which ozone levels are decreased by human activities, using equations to support your answer.
Human activities can release chemicals like chlorofluorocarbons (CFCs), halons, carbon monoxide (CO) and nitrogen oxides (NOx) into the atmosphere that can decrease the ozone levels.
Release of chlorofluorocarbons (CFCs) these chemicals are released into the atmosphere, they can react with ozone and break it down. The reaction between CFCs and ozone can be represented by the following equation:
CFC + UV radiation → CFC radical + Cl
Cl + O3 → ClO + O2
ClO + O3 → Cl + 2O2
The equations provided support the fact that these activities can contribute to ozone depletion by breaking down ozone through chemical reactions.
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what feature of the electronic energies of the hydrogen atom explains why the emission spectrum consists of discrete wavelength rather than a continuum wavelength?
The discrete nature of the hydrogen atom's electronic energy levels leads to the discrete wavelengths in its emission spectrum.
The emission spectrum of hydrogen consists of discrete wavelengths because the electrons in hydrogen atoms occupy specific energy levels (or orbitals) and can only transition to a lower energy level by emitting a photon with a specific energy (and hence, specific wavelength).
This is due to the quantization of energy in the hydrogen atom, which means that electrons can only occupy specific energy levels and not any intermediate value.
When an electron drops from a higher to a lower energy level, it emits a photon of light with energy equal to the difference in energy between the two levels, which results in a discrete line in the emission spectrum.
Hence, the discrete nature of the hydrogen atom's electronic energy levels leads to the discrete wavelengths in its emission spectrum.
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hydrophilic molecules group of answer choices are charged molecules that are attracted to the partial charge of the water molecule are uncharged, nonionic substances that repel water are polar molecules that are attracted to the nonpolar portion of the water molecule are nonionic molecules that are attracted to the nonpolar portion of the water molecule
Hydrophilic molecules are the charged molecules which are attracted to the partial charge of the water molecule.
A hydrophilic molecule or the portion of a molecule is one whose interactions with water as well as other polar substances are more thermodynamically favorable than their interactions with oil or other hydrophobic solvents. They are typically charge-polarized as well as capable of hydrogen bonding. Hydrophilic molecules (and the portions of molecules) will be contrasted with hydrophobic molecules (and portions of molecules). In some cases, both hydrophilic as well as hydrophobic properties occur in a single molecule.
Hydrophilic as well as hydrophobic molecules are also called as polar molecules and nonpolar molecules, respectively. Some hydrophilic substances do not dissolve. This type of mixture is known as colloid.
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1. Why ere mutations needed for the species of moth to survive during the Industrial Revolution in London? Explain how this mutation lead to the evolution of this species of moth.
Since the revolution, the moth's white colour can no longer blend in with the trees. The moths' white wings turn ash brown as a result of a genetic mutation brought on by pollution. The moths are protected from predators by the wings, which blend very well with the surrounding trees.
What is natural selection ?Natural selection is a technique used to adapt and transform populations of living things. People in a population are naturally diverse, which means that every person is distinctive in some ways. This variation shows that some people have traits that make them better matched to their environments than others.
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How do I calculate the number of moles of AI2O3
The number of mole of Al₂O₃ produced when 0.60 mole of Fe is produced is 0.2 mole
How do I determine the number of mole of Al₂O₃ produced?We'll begin by obtaining the mole of Al that reacted to produce 0.6 mole of Fe. Details below:
2Al + 3FeO -> 3Fe + Al₂O₃
From the balanced equation above,
3 moles of Fe were produced from 2 moles of Al
Therefore,
0.6 mole of Fe will be produce from = (0.6 × 2) / 3 = 0.4 mole of Al
With the above information, we can determine the number of moles of Al₂O₃ produced. This can be obtained as follow:
From the balanced equation above,
2 moles of Al reacted to produce 1 mole of Al₂O₃
Therefore,
0.4 moles of Al will react to produce = (0.4 × 1) / 2 = 0.2 mole of Al₂O₃
Thus, number of mole of Al₂O₃ produced is 0.2 mole
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Which term correctly balances the nuclear equation below?
223
87 Fr →
0 0
О
-1e
0
1e
oү
4
2 He
+
223
88 Ra
Answer:
to remember when balancing nuclear equations: 1. The total of the superscripts (mass numbers, ) in the reactants and products must be the same. 2. The total of the subscripts (atomic numbers, ) in the reactants and products must be the same P a r t A What is the value of in the following nuclear reaction?
When you balance an equation you can only change the coefficients (the numbers in front of molecules or atoms). Coefficients are the numbers in front of the molecule. Subscripts are the smaller numbers found after atoms. These cannot be changed when balancing chemical equations! Subscripts are the smaller numbers found after atoms.
Balanced chemical equations have the same number and type of each atom on both sides of the equation. The coefficients in a balanced equation must be the simplest whole number ratio. Mass is always conserved in chemical reactions.
Keeping this in view, what is meant by a balanced equation? A balanced equation is an equation for a chemical reaction in which the number of atoms for each element in the reaction and the total charge is the same for both the reactants and the products. Also Known As: Balancing the equation, balancing the reaction, conservation of charge and mass.
Explanation:
which atomic properties of the lanthanides lead to their remarkably similar chemical properties?
The atomic characteristics of lanthanides do not significantly change over time, like other transitional elements.
Due to their ease in losing three electrons and producing M 3 + 3+ 3+ ions with very identical radii, lanthanides share many chemical characteristics with one another. All lanthanides exhibit a common +3 outer electrical configuration that is similar to other elements. Since their compounds are in an oxidation state, lanthanides share a great deal of chemical characteristics with one another.The outer electronic structure and predominant +3 oxidation state of all lanthanides make up their nearly identical chemistry. Because lanthanides differ mostly in the number of 4f electrons, their resemblance is substantially greater than that of typical transition elements.Oxygen and lanthanides commonly combine to generate oxides. While the reaction can occur quickly when heated, it can occur slowly at room temperature. The reduction in atomic size of elements with filled f-subshells is known as the lanthanide contraction.
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Given the equation y = kx²/z, if y and z are both doubled and k remains constant, then x: a) is also doubled b) remains unchanged c) becomes half of its original value d) becomes four times larger
The graph of the equation will remain the same, showing that x has not changed.
Given the equation y = kx²/z, if y and z are both doubled and k remains constant, then x remains unchanged. This can be shown mathematically by rearranging the equation for x to x = (yz/k). Since both y and z have doubled, their product also doubles and the equation becomes x = (2z2/k). Since k remains constant, the denominator remains the same and therefore the value of x is unchanged.
Given the equation y = kx²/z, if y and z are both doubled and k remains constant, then the value of x remains unchanged. This is because doubling y and z will cancel each other out, resulting in the equation remaining the same. Mathematically, this can be expressed as y = kx²/z and 2y = k(2x²)/(2z). Canceling out the 2s on both sides of the equation, we get y = kx²/z, which is the same equation as before. Therefore, the value of x remains unchanged.This can also be demonstrated graphically. If y and z are shown on the y-axis and x on the x-axis, then when y and z are both doubled, the graph of the equation will remain the same, showing that x has not changed.
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the moles is a counting unit defined as 1 mole = 6.022 × 1023 objects. if you have a sample of 1.25 × 10-6 moles of h2o, how many oxygen atoms would the sample contain?
If you have a sample of 1.25 × 10⁻⁶ moles of H₂O, the number oxygen atoms the sample will contain is 7.5 × 10¹⁷ atom of O.
1 mole of the substance = 6.022 × 10²³ atoms
The moles of water = 1.25 × 10⁻⁶ moles of the water
18 g of the water in 1 mole = 1.25 × 10⁻⁶ moles of water
16 g of the oxygen in 1 mole = 1.25 × 10⁻⁶ atoms of oxygen
The moles of the O atom = (1 × 1.25 × 10⁻⁶ ) 6.022 × 10²³ atom of O
The moles of the O atom = 7.5 × 10¹⁷ atom of O
Thus, the number of the oxygen atom in water is 7.5 × 10¹⁷ atom of O.
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