The decomposition of limestone is the reaction of calcium carbonate (CaCO3) with heat to form calcium oxide (CaO) and carbon dioxide (CO2).
The equilibrium constant for a reaction is typically represented by a specific symbol, such as Kc or Kp, and is a measure of the relative concentrations of the reactants and products at equilibrium.The equilibrium constant for the decomposition of limestone is represented by Kc and is the product of the concentrations of the products raised to their stoichiometric coefficients, divided by the product of the concentrations of the reactants raised to their stoichiometric coefficients. Kc = [CaO] * [CO2] / [CaCO3]. Therefore the correct answer is D. [CaO] × [CaCO3]
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11. a student has two identical guitar strings of the same length. one has a tension f1. when he plucks this string, it produces a sound of 440 hz for its fundamental note. the second string has a tension that is 1.0% higher than the first, f2
The period of the vibration 2.27 milliseconds.
The mass of a string under tension can be determined in what way?m = V provides information about the string's mass. For instance, the volume V = 0.398 cm3 and mass m = 1.140.398 = 0.454 gm of a nylon string with a 1.30 mm = 0.13 cm diameter and a length of 30 cm, respectively Typically, a racquet's entire string mass is 15 grams (0.015 lb), or about that.
T=f1 T = f 1 is the formula for calculating an oscillation's period, which is the inverse of frequency. This translates into the following in the example: T=1440 Hz=0.00227 s=2.27 ms T = 1 440 H z=0.00227 s=2.27 ms 2.27 milliseconds pass during each vibration.
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according to the following reaction, how many grams of dichloromethane () will be formed upon the complete reaction of 30.9 grams of carbon tetrachloride with excess methane ()?
30.9 grams of dichloromethane (CH2Cl2) will be formed upon the complete reaction of 30.9 grams of carbon tetrachloride with excess methane.
The balanced equation for the reaction is: CH4(g) + CCl4(g) -> CH2Cl2(g) + HCl(g). To determine the amount of dichloromethane (CH2Cl2) that will be formed upon the complete reaction of 30.9 grams of carbon tetrachloride with excess methane, we can use the concept of stoichiometry. Stoichiometry is the branch of chemistry that deals with the quantitative aspects of chemical reactions, including the mass relationships between reactants and products.From the balanced equation, we can see that the reaction has a 1:1 ratio between the carbon tetrachloride and the dichloromethane. Therefore, if we know the amount of one substance, we can calculate the amount of the other substance by using the stoichiometric ratio. 30.9 grams of CCl4 will react with an excess of methane to form 30.9 grams of CH2Cl2. So the answer is 30.9 grams of dichloromethane (CH2Cl2) will be formed upon the complete reaction of 30.9 grams of carbon tetrachloride with excess methane.
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The complete question is :
according to the following reaction, how many grams of dichloromethane () will be formed upon the complete reaction of 30.9 grams of carbon tetrachloride with excess methane ()?methane (CH4)(g) + carbon tetrachloride(g) dichloromethane (CH2Cl2)(g)
fill in the blanks with the correct notation, atomic symbols, mass number, atomic number, decay type, and/or emission particles
Writing for atomic symbols looks like this: [tex]x^{A}_{^{Z} }[/tex] , Here, A denotes the mass number, Z the atomic number, while alpha, beta, and gama denote the various forms of decay.
The mass number, sometimes referred to as the atomic mass number or nucleon number, is the total number of protons and neutrons, which are collectively known as nucleons, in an atomic nucleus (symbol A, from the German word atomic number).while alpha, beta, and gama denote the various forms of decay. In chemistry, chemical symbols are used to represent chemical elements, functional groups, and compounds. Chemical elements are symbolised using one or two letters from the Latin alphabet, usually with the first letter capitalised.
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if applied energy to the energy level diagrams resulted in the excitation of electrons, in your own words describe a phenomenon that could occur.
if applied energy to the energy level diagrams resulted in the excitation of electrons, in your own words describe a phenomenon that could occur.-The second step is consistent.
The proposed mechanism in which the reaction proceeds through two steps, with the first step being the slow step and the second step being the fast step, can be consistent with the given information that the reaction is first order in H2(g) and also first-order in ICl(g).In the first step, H2(g) reacts with ICl(g) to form HI(g) and HCl(g) which is the slow step. This step is first-order in H2(g) and first-order in ICl(g), as the rate of the reaction depends on the concentrations of both H2(g) and ICl(g).In the second step, HI(g) reacts with ICl(g) to form HCl(g) and I2(g) which is the fast step. Because this step is much faster than the first step, it can be considered to be at equilibrium and the concentrations of HI(g) and ICl(g) are not affected by the second step.The overall reaction order is the sum of the reaction order of the individual steps, so the overall reaction order is first order in H2(g) and first-order in ICl(g), consistent with the information given in the problem.
The complete question is :
The equation for the reaction between hydrogen and iodine monochloride is H2 (g)+2ICl(g)2HCl(g)+I2 (g). This reaction has the highest order in H2 (g) and the lowest order in ICI (g). Which of these proposed mechanisms is consistent with the information provided about this reaction?
Step 1: H2(g) + ICl(g) + HI(g) + HCl(g) (slow)
Step 2: HI(g) + ICl(g) + HCl(g) + I2(g) (fast)
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Although databases are consistently updated so that scientists can assign probabilities to class evidence, for the most part, forensic scientists must rely on ___ when interpreting the significance of class physical evidence.
Personal experience when interpreting the significance of class physical evidence.
What is meant by experience ?
Experience is used to describe conscious events in general, perceptions in particular, or the knowledge and comfort that are produced by these conscious processes. Experience involves a subject to which multiple elements are offered, taken to mean a conscious event in the broadest sense. This is because experience is typically equated with perception and set apart from other conscious activities like thinking and daydreaming. In a slightly different context, experience refers to the knowledge and comfort that conscious events create rather than the conscious events themselves. In this regard, it is crucial that knowledge originates from direct perceptual contact with the outside world.To learn more about experience refer to
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Be sure to answer all parts. Consider the reaction A + B → Products From the following data obtained at a certain temperature, determine the order of the reaction. Enter the order with respect to A, the order with respect to B, and the overall reaction order A] (M) [BI (M) Rate (M/s) 1.50 |1.50 |3.20 × 10^-1 1.50 | 2.50 | 3.20 × 10^-1 3.00 | 1.50 | 6.40 × 10^-1 Reaction
To determine the order of the reaction with respect to reactant A, we can perform experiments at different concentrations of A while keeping the concentration of B constant.
What are reactants?
A reactant is a substance that is consumed in a chemical reaction. In a balanced chemical equation, all reactants are listed on the left side of the equation and are consumed as the reaction proceeds. The reactant that is used up first in a reaction is called the limiting reactant or limiting reagent.
From the data provided, we see that when [A] is 1.5 M and [B] is 1.5 M, the rate of the reaction is 3.2 x 10^-1 M/s. When [A] is 3.0 M and [B] is 1.5 M, the rate of the reaction is 6.4 x 10^-1 M/s.
Since the rate of the reaction is directly proportional to the concentration of A, we can say that the order of the reaction with respect to A is 1.
To determine the order of the reaction with respect to reactant B, we can perform experiments at different concentrations of B while keeping the concentration of A constant. From the data provided, we see that when [A] is 1.5 M and [B] is 1.5 M, the rate of the reaction is 3.2 x 10^-1 M/s. When [A] is 1.5 M and [B] is 2.5 M, the rate of the reaction is 3.2 x 10^-1 M/s.
Since the rate of the reaction does not change with the concentration of B, we can say that the order of the reaction with respect to B is 0.
The overall reaction order is the sum of the order with respect to each reactant. So the overall reaction order for this reaction is 1 + 0 = 1.
Therefore, the order of the reaction with respect to reactant A is 1, the order of the reaction with respect to B is 0, and the overall reaction order is 1.
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Based on the diagram, organic solids that have settled to the bottom of the treatment tanks in step B are transferred to which of the following for further processing?
The sludge treatment tank , organic solids that have settled to the bottom of the treatment tanks in step B are transferred.
What is sludge treatment tank?
The procedures utilized to handle and dispose of the sewage sludge created during sewage treatment are referred to as sewage sludge treatment. In order to cut down on transportation and disposal expenses as well as potential health issues, sludge treatment focuses on reducing sludge weight and volume.
What is organic solids ?
All organic solids share the unique property of being intricate chemical complexes based on carbon. Due to the fact that carbon atoms contain four valence electrons, they frequently combine with atoms of other elements, such as hydrogen or nitrogen, to create covalent bonds.
Therefore, sludge treatment tank , organic solids that have settled to the bottom of the treatment tanks in step B are transferred.
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a substance that cannot be broken down into other substances by ordinary chemical procedures is a(n) . view available hint(s)for part a a substance that cannot be broken down into other substances by ordinary chemical procedures is a(n) . molecule element compound proton isotope
Pure substances that cannot be broken down into simpler substances by chemical changes are called elements.
What is an element?
An element is a basic object that cannot be easily divided into smaller pieces. In chemistry and physics, an element is a substance that cannot be broken down by non-nuclear reactions. In computing and mathematics, an element is a separate part of a larger system or set.They are the building blocks of chemistry and matter. Each element is defined by the number of protons in its nucleus. Each element has an atomic number and symbol. The symbol may be based on the Latin name of the element and may not be related to the English name.To know more about elements, click the link given below:
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The periodic law states that:
a. when elements are arranged in increasing order of mass, there is a periodic repetition of properties.
b. when elements are arranged in increasing order of atomic number, there is a periodic repetition of properties.
c. when elements in the same period are observed, they all have the same properties.
d. when elements in the periodic table are arranged in certain ways, they will have the same atomic properties.
Dmitri Mendeleev and Lothar Meyer each independently developed the periodic law in 1869. The first periodic table was made by Mendeleev, and Meyer soon after. They both suggested that certain attributes frequently recur and grouped the elements according to their mass.
what is meant by periodic law ?
According to the periodic law, when the elements are organised in order of increasing atomic number, their physical and chemical properties repeat in a regular and predictable manner. Numerous characteristics occur repeatedly. When the components are properly ordered, patterns in their characteristics become visible and can be used to forecast the properties of unknown or foreign elements just by looking at how they are arranged on the table.
Periodic Law: Its Importance
Considered one of the most crucial ideas in chemistry is periodic law. Whether consciously or unconsciously, every scientist applies periodic law when working with chemical elements, their properties, and chemical reactions. The contemporary periodic table was created as a result of periodic law.
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T/F chromatography is a technique that depends on the differences in the rate of travel of different substances through a solid medium.
Chromatography is the technique that depends on the differences in the rate of travel of the different substances through a solid medium. This statement is true.
Chromatography is defined as the process for separating the components of a mixture. By dissolving the mixture of the interest in the mobile phase and transporting it through the stationary phase, mixture to its constituents can be separated from one another which is based on their different speeds of travel. The common chromatography are :
The gas chromatographyThe liquid chromatographyThe thin layer chromatographyThe ion exchange chromatographyThu, the given statement is true that the chromatography is a technique that depends on the rate of travel of different substances through the solid medium.
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Determine whether each of the following chemical reactions will occur. If t the products of the reaction. If they will not, explain why not 1) --Li + _ Pb(OH)2 → 2)__C4H8 + 02 →3)__KOH+ ___BaF2-->4) __AICI3+__Ag2SO45)__Fe(OH)3+____NaCI--
Yes, all of the above chemical processes will occur.
If the final products of the reaction are LiOH + Pb and CO2 + H2O.
1. Lithium hydroxide and lead(II) hydroxide combine to form LiOH and Pb(OH)2 (lead).
Li + Pb(OH)₂LiOH + Pb
is the chemical formula for this reaction.
2. Carbon dioxide (CO2) and water (H2O) are the products of the reaction between butane (C4H8) and oxygen (O2) (water).
C4H8 + O2 + CO2 + H2O
is the chemical formula for a combustion reaction.
3. Due to their chemical incompatibility, potassium hydroxide (KOH) and barium fluoride (BaF2) cannot mix.
4. The chemical incompatibility between silver sulfate (Ag2SO4) and aluminum iodide (AICI3) prevents their reaction.
5. Because sodium chloride (NaCl) and iron(III) hydroxide {Fe(OH)}₃ are chemically incompatible, they cannot combine.
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Strontium-90 is a byproduct in nuclear reactors fueled by the radioisotope uranium-235. The half-life of strontium-90 is 28.8 yr. What percentage of a strontium-90 sample remains after 115.2 yr?
The half-life of a radioisotope is the amount of time it takes for half of the atoms in a sample to decay. For strontium-90, the half-life is 28.8 years.
To determine the percentage of a sample that remains after 115.2 years, we can use the formula:
Percentage remaining = (1/2)^(time in years / half-life) x 100
Plugging in the values, we get:
Percentage remaining = (1/2)^(115.2 / 28.8) x 100
Percentage remaining = (1/2)^4 x 100
Percentage remaining = (1/16) x 100
Percentage remaining = 6.25%
So, after 115.2 years, 6.25% of a strontium-90 sample remains.
What mass of copper would be deposited at the cathode if a current of 2.5 A flows through copper(II) sulfate solution for 51 minutes and 28 seconds?
1.28 g
2.56 g
5.12 g
10.24 g
Which is the correct equation for K?
Answer:
uncomplete question
Explanation:
identify the expected hybridization state and geometry for the central atom in the following compound
The molecules feature a linear arrangement of atoms with a 180° bond angle when hybridization takes place. Example: CO 2 hybridization. Carbon undergoes sp2 hybridization.
what is meant by hybridization?
A new form of hybridized orbitals is created by combining two atomic orbitals, which is known as hybridization in chemistry. Hybrid orbitals with completely distinct energies, forms, etc. are typically created as a result of this intermixing. For the most part, hybridization involves atomic orbitals at the same energy level. But if the energy is equal, both fully and partially filled orbitals can participate in this process.
On the other hand, we can claim that the notion of hybridization is a development of the valence bond theory and that it aids in our comprehension of the creation of bonds, bond energy, and bond lengths.
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A backyard pond has 2.5 M3 of water what is the volume in cubic inches?
The volume in cubic inches 1.5x10^5in3 if A backyard pond has 2.5 M3 of water.
What is volume formula?Whereas the basic formula for the area of a rectangular shape is length × width, the basic formula for volume is length × width × height. How you refer to the different dimensions does not change the calculation: you may, for example, use 'depth' instead of 'height'.
What is volume of a liquid?Measuring the Volume of a Liquid At its most basic level, volume is simply a measure of space. When measuring the volume of a liquid, sometimes referred to as capacity, the units liters (L) and milliliters (mL) are used. Devices used for this measurement include graduated cylinders, beakers, and Erlenmeyer flasks.
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How many grams of calcium nitride (Ca3N2) are produced when 4.00 g of nitrogen reacts with an excess of calcium?
3Ca + N2 → Ca3N2
a
21.2 g of Ca3N2
b
0.756 g of Ca3N2
c
0.378 g of Ca3N2
The correct answer is c. 0.378 g of Ca3N2
The balanced chemical equation for the reaction is:
3Ca + N2 → Ca3N2
We can see that for every 3 moles of calcium, 1 mole of nitrogen is used. Using the molar mass of calcium (40.08 g/mol) and nitrogen (28.02 g/mol) we can calculate how many moles of each reactant we have.
4.00 g of nitrogen is equal to 4.00 g / 28.02 g/mol = 0.1428 mol of nitrogen
We know that we have an excess of calcium, so we only need to consider the amount of nitrogen present.
We can use the stoichiometry of the reaction to calculate how many grams of Ca3N2 are produced.
1 mole of nitrogen reacts with 3 moles of calcium to produce 1 mole of Ca3N2
0.1428 mol N2 x (1 mole Ca3N2 / 3 mole N2) = 0.04760 mole of Ca3N2
We can convert this number of moles to grams using the molar mass of Ca3N2 (128.09 g/mol)
0.04760 mole of Ca3N2 x 128.09 g/mol = 0.378 g of Ca3N2
fundamental mechanisms of solvent decomposition involved in solid-electrolyte interphase formation in sodium ion batteries
There are 2 interphases: anode solid electrolyte interphase and cathode electrolyte interphase.
In battery systems an interphase forms at the interface between electrode and electrolyte at the decomposition of the latter. In fig. cathode and anode surface of the atom has been shown. The ions are transported in bulk electrolyte and then pass through desolvation pass to pass this cathode electrolyte interphase. This interphase must have high permeability, and sensitivity, an electronic insulator, should be insoluble and inert so that it doesn't create any issue in the system and will not affect the chemical and electrochemical environment of the cell. Thereby after the desolvation process, it can easily pass the interphase.
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Consider a cloudless day on which the sun shines down across the United States. If 2466 kJ of energy reaches a square meter (m2) of the United States in one hour, how much total solar energy reaches the entire United States per hour? The entire area of the United States is 9,158,960 km2 .
solar energy per hour:
The solar energy that has reached the entire area of the United States per hour, is 22,585,995,360,000,000 kJ of energy
How to find the energy ?To find the energy, you first need to convert the area of the United States from squared kilometers to square meters.
1 square kilometer is 1, 000, 000 so 9,158,960 square kilometers would be:
= 9,158,960 x 1, 000, 000
= 9,158,960, 000, 000 square meters
The solar energy per hour for the United States is:
=Area of the United States x energy per square meter
= 9,158,960,000,000 x 2, 466
= 22,585,995,360,000,000 kJ of energy
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In chemistry the mole is a fundamental unit of measurement. The mole can be utilized to measure matter in terms of mass, volume, and numbers of particles. The mole is the amount of a substance which contains as many elementary particles as there are atoms in 0.012 kilogram of carbon-12 atoms. Match the following: 298.81 6.02 x 1023 22.4L 1. volume of one mole or gas at STP number of particles in one mole of any substance 2. What is the mass of 9.30 moles of SiH?
Volume of one mole or gas at STP is 22.4L. Number of particles in one mole of any substance is [tex]6.02X10^{23}[/tex]. The mass of 9.30 moles of SiH is 298.81.
What is mole measurement?In chemistry, a mole is a common unit of measurement for huge concentrations of very small objects like atoms, molecules, or other predetermined particles.
The mole designates [tex]6.02X10^{23}[/tex] units, which is a very large number.
For instance, we can compute the number of moles and the number of atoms or molecules in a sample if we know the mass and chemical composition of the substance.
Similarly, we may determine the number of atoms or molecules in a substance and determine its mass if we know how many moles it has.
At STP, a mole of gas has a 22.4L volume. One mole of any substance contains 6.02214076 1023 particles. 9.30 moles of SiH have a mass of 298.81.
Thus, this is the match for the given scenario.
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If the concentration of [S2O82−] is doubled while keeping [I−] constant, which of the following experimental results is predicted based on the rate law, and why? A The rate of reaction will remain the same, because k will decrease by half. B The rate of reaction will double, because the rate is directly proportional to [S2O82−].. C The rate of reaction will increase by a factor of four, because two moles of SO42− are produced for each mole of S2O82− consumed. D The rate of reaction will increase by a factor of four, because the reaction is second order overall.If the concentration of [S2O82−] is doubled while keeping [I−] constant, which of the following experimental results is predicted based on the rate law, and why? A The rate of reaction will remain the same, because k will decrease by half. B The rate of reaction will double, because the rate is directly proportional to [S2O82−].. C The rate of reaction will increase by a factor of four, because two moles of SO42− are produced for each mole of S2O82− consumed. D The rate of reaction will increase by a factor of four, because the reaction is second order overall.
The rate of reaction will double, because the rate is directly proportional to [S2O82−].
What is meant by rate ?
A quantity, amount, or degree of something calculated in relation to one unit of another.A payment or charge that is calculated using another amount. more specifically: the premium per insurance unit. transitive verb rating"Per unit of time" is a frequent sort of rate, and examples include speed, heart rate, and flux.Exchange rates, literacy rates, and electric fields are a few examples of ratios with a non-time denominator.A rate in mathematics is the comparison of two related values expressed in different units.The numerator of the ratio expresses the rate of change in the other variable if the denominator of the ratio is given as a single unit of one of these quantities and it is expected that this quantity can be altered systematically.To learn more about rate refer to
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Which of the following formulas correctly identify the usual form of each element at room temperature? Select all that apply. A. B2 B. S2 C. P4 D. O2 E. Cl2.
At room temperature, each element typically exists in one of the following three forms: C. P4, D. O2, and E. Cl2.
What metal atom can produce 2+ and 3+ ions simultaneously?Atoms of iron (Fe) can form either 2+ or 3+ cations, for instance. While lead (Pb) can only create 2+ or 4+ cations, cobalt (Co) is another metal that has the potential to generate multiple charged ions (2+ and 3+).In their elemental state, a number of the nonmetals are gases. At ambient temperature, the following elements are all gases: chlorine (Cl, element 17), fluorine (F), oxygen (O), nitrogen (N), hydrogen (H), and nitrogen (N, element 7).At room temperature, each element typically exists in one of the following three forms: C. P4, D. O2, and E. Cl2.To learn more about element refer to:
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which of the following best represents how a single gene can encode more than one type of protein? choose 1 answer: choose 1 answer:
Splicing represents how a single gene can encode more than one type of protein.
What is Splicing?
Splicing is the process of removing introns from a gene and joining the exons together. This process is necessary for the production of a functional protein. In eukaryotic organisms, genes are composed of both exons (the coding regions) and introns (non-coding regions). During splicing, the introns are removed and the exons are connected. The resulting mRNA molecule is then ready for translation into a functional protein. Splicing can be either intron-mediated or trans-splicing, depending on the type of organism and the type of gene. Intron-mediated splicing occurs in eukaryotes, while trans-splicing occurs in prokaryotes.
It is a post-transcriptional modification that allows a single gene to code for multiple proteins. In eukaryotes, gene splicing occurs prior to mRNA translation by the differential inclusion or exclusion of pre-mRNA regions. Splicing of genes is a significant source of protein diversity.
Therefore, Splicing is the correct answer.
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A single gene can encode more than one type of protein through several different mechanisms, including:
How a single gene can encode more than one type of protein? Alternative splicing: This is a process in which different parts of the RNA transcribed from a gene are selectively included or excluded, resulting in the production of multiple different protein isoforms from the same gene.Post-transcriptional modifications: These are changes that occur to the RNA after it has been transcribed from the gene. For example, RNA can be edited, which can change the sequence of the encoded protein.Translation initiation: Different proteins can be produced from the same gene by starting translation at different locations.Ribosomal frame shifting: This occurs when the ribosome "slips" during translation, resulting in a different reading frame and the production of a different protein.Proteolytic cleavage: Proteins can be produced by cleaving a precursor protein into multiple functional proteins.In summary, a single gene can encode multiple proteins through alternative splicing, post-transcriptional modifications, translation initiation, ribosomal frame shifting, and proteolytic cleavage.To learn more about single gene refer:
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Match each description to the correct term_
• liquid that dissolves another substance Choose • chemical that is dissolved Choose • value used to describe the amount of one substance dissolved in another Choose: • liquid consisting of one substance dissolved In another Choose
The right responses are "solvent, solute, concentration, and solution." The components of a liquid that comprises multiple substances are referred to by various names.
Describe each of the components of a liquid?The components of a liquid that comprises multiple substances are referred to by various names. A solvent is described as a liquid that dissolves another substance; in the case of sugar dissolved in water, the solvent is water. The solute, or dissolved chemical, in this example will be sugar. The phrase "concentration" refers to the ratio of one substance to another, such as weight to weight, volume to weight, molarity, etc. A solution is a liquid that has one material dissolved in another; in this case, the sugar was dissolved in water.The right responses are "solvent, solute, concentration, and solution." The components of a liquid that comprises multiple substances are referred to by various names.To learn more about components of a liquid refer to:
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identify the type of compound that would have the following properties? conducts electricity when melted or dissolved in water. high melting point usually a solid
Answer: Ionic Compounds
What are Ionic Compounds?
Ionic compounds are compounds formed by the complete transfer of electrons between two atoms forming a strong ionic bond.
Ionic compounds are composed of oppositely charged ions held together by strong electrostatic attraction.
Characteristics of Ionic Compounds:
Ionic compounds have high melting points.Ionic compounds are hard and brittle.When dissolved in water they dissociate into ions.Solutions of ionic compounds and molten ionic compounds conduct electricity, but solid materials do not.Ionic compounds can be identified by their chemical formula: metal + non-metal or polyatomic ion.Hence, the given explanation states that Ionic Compounds have the following properties.
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All isotopes of an element have nearly identical chemical behavior because chemical behavior is determined primarily by ______.
a) the number of protons in the element
b) the number of electrons in the element
c) the mass of the element
d) the color of the element
Option (a) is correct. All isotopes of an element have nearly identical chemical behavior because chemical behavior is determined primarily by the number of protons in the element.
Isotopes can be defined as an atoms with the same number of protons but different numbers of neutrons. Isotopes share the same chemical properties but differ in mass and physical properties. The isotopes which do not emit radiation are called stable isotopes. The isotopes which do emit radiation are called radioisotopes. Like Uranium some elements can only exist in an unstable form. All the elements have isotopes. It can be defined as a form of a chemical element in which the atoms have the same number of protons and a different number of neutrons.
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A mixture that is not uniform throughout is a/an _______ mixture.
Answer: heterogeneous mixture
Explanation: The heterogeneous mixture has a non-uniform composition and has two or more phases. It can be separated out physically. Example: A mixture of sodium chloride and sand.
Copper-64 is used in the form of copper acetate to study brain tumors. It has a half-life of 12.8 hours. If you begin with 15.0 mg of 64 Cu-labelled copper acetate, what mass in mg remains after 2 days and 16 hours?
Answer:
0.58 milligrams
Explanation:
If this isnt correct than I appologize.
Just half of the power of tt makes up 60 hours. Then it is divided by t half knowing that there is 12.8 hours left. Then if you calculate it we get 0.58 mg and so after the 2 days and 16 hours we get our answer.
would your calculated empirical formula be higher than, lower than or the same as the actual empirical of magnesium oxide if the product ignited and burned for a long period of time.
The empirical formula be the same as the actual empirical of magnesium oxide is MgO.
The empirical formula of magnesium oxide is :
The Mass of Mg = 0.297
The Mass of Magnesium Oxide = Mass of Mg + Mass of O
0.493 g = 0.297 g + Mass of O
Mass of O = (0.493 - 0.297)g
= 0.196g
Moles of Mg = 0.297 g Mg × 1 mol Mg / 24.3g Mg
= 0.012 mol of Mg
Moles of O = 0.196 g O × 1 mol O / 1 6g O
= 0.012 mol of O
Dividing by the smallest one :
Mg = 1
O = 1
The empirical formula is MgO.
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consider the two electron arrangements for neutral atoms a and b. what is the difference between atom a and atom b? a - 1s 2 2s 2 2p 6 3s 1 b - 1s 2 2s 2 2p 6 5s 1 atom b has lost some inner electrons. the outer electron of atom b has moved to a higher energy state. the outer electron of atom b has moved to a lower energy state.
The difference between atom a and atom b is that atom b has lost some of its inner electrons.
What is the electrons?
Electrons are subatomic particles that are part of the atomic structure. They carry a negative electrical charge and are found in the shells or orbitals of an atom. Electrons are the fundamental particles of electricity and are responsible for a variety of electrical and magnetic phenomena. These particles are also the main components of electric and magnetic fields. In addition, electrons are the building blocks of atoms, as they are arranged in shells of varying sizes and numbers depending on the element. Electrons are the main constituents of all matter, and they are responsible for the bonds that form between atoms and molecules.
This is because the outer electron of atom b has moved to a higher energy state, which is the 5s orbital, while the outer electron of atom a is in the 3s orbital. This means that atom b has fewer electrons in its inner shells, giving it a different electron arrangement and consequently a different chemical behavior.
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