Answer:
32C Is the water hot or cold?
Explanation:
The final temperature of 690.1 g of water is 20.024°C.
To find the final temperature of 690.1 g of water, we need to know the initial temperature and the amount of heat added to the water. Water has a specific heat capacity of 4.184 J/g°C.
Here is an example calculation:
Let's say the initial temperature of the water is 20°C and we add 100 J of heat. To find the final temperature, we can use the equation:
q = mcΔT
where q is the heat added, m is the mass of the water (690.1 g), c is the specific heat capacity of water (4.184 J/g°C), and ΔT is the change in temperature.
Solving for ΔT:
ΔT = q / (mc)
ΔT = (100 J) / (690.1 g × 4.184 J/g°C)
ΔT = 0.024°C
We multiply the original temperature by the temperature change to obtain the final temperature:
final temperature = initial temperature + ΔT
final temperature = 20°C + 0.024°C
final temperature = 20.024°C
So the final temperature of 690.1 g of water is 20.024°C.
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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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Using the reagents below, list in order (by letter, no period) those necessary to prepare 2-bromo-3-methylbutane from 2-methylbutane. Note: Not all spaces provided may be needed. Type "na" in any space where you have no reagent. a. Br2, heat, light b. Na, (-H2) c. NaI(SN2) d. NH4NO3 e. HBr, ROOR f. EtoH g. NaOEt, EtoH, heat
When ethanolic KOH and 2-Bromo-2-methyl butane are refluxed, the main product that results is 2-methylbut-2-ene. A combination of 2-methyl-2-butene and 2-methyl-I-butene is created when 2-bromo-2-methylbutane is subjected to a base reaction.
2-Methyl-L-Butene makes up 459 of the resultant mixture when potassium hydroxide is the base. Because the bromine-attached carbon atom is linked to the other two carbon atoms, the molecule is known as a secondary alkyl halide. As a result, 2-bromobutane is known as a secondary alkyl halide. The liquid is colorless and has a lovely aroma. Since 1-bromobutane is a main alkyl halide, it is created through bimolecular nucleophilic substitution processes (Sn2).
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Calculate the energy required to heat 419.0 mg of iron from 1.2 degree C to 15.1 degree C. Assume the specific heat capacity of iron under these conditions is 0.449 J middot g^-1 middot K^-1. Be sure your answer has the correct number of significant digits.
The energy required to heat 419.0mg of iron from 1.2 degree C to 15.1 degree C is 2.625 J. This is calculated from the expression of Specific heat capacity.
Heat capacity is a characteristic of an object that explains the amount of heat required to change its temperature by one degree. Heat Capacity has the units of energy per degree. Specific Heat Capacity is the amount of heat required to change the temperature of a mass unit of a substance by one degree. Specific heat is a common term for the specific heat capacity.
Q = m*c*dT
This is the equation for specific heat capacity. here, m is the mass of the sample, c is the specific heat, and ΔT is the temperature change.
Putting all the values we get,
m = 419 mg = 0.419 g of Iron
dT = 15.1 -1.2 = 13.9 °C
Q = 0.419*0.449*13.9 = 2.615 J
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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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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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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)
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.
1. A chemist needs to prepare 4.00 L of a 0.50 M solution of potassium permanganate (KMnO4). What mass of KMnO4 does she need to make the solution?
2. Determine the molality of a solution prepared by dissolving 20 g of sodium chloride (NaCl) in 150. g of water. This problem is similar to Sample Problem 16.5.
She needs 128.375 g of kmno4 to make the solution.
Data:
2.5 L is the volume. 0.325 M for concentration Calculate the moles of KMnO4 for potassium permanganate (Molar mass): 39 + 55 + (16 x 4) = 158 g.
What separates molality from mole molarity?Its molarity is the ratio of a molecule in meters to every liters in a solution. The solution contains both the solute and the solvent. Mass of an object, on the other hand, is the ratios of both the molecules of a component to the grams of a solvent.
What is molarity, for instance?The mole of material per liter of water is measured as molarity. For instance, when table salt is dissolved in water, water serves as both the solution and the solute. Sodium chloride weights 58.44 grams per mole. 58.44 grams of sodium chloride dissolve for one liters of water to form a one molecule solution, or 1M.
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Penalty for an incorrect guess is equal to the credit for a correct response. In the event of a property fire in the Chemistry Teaching Labs (not involving any person or clothing), what should a lab student do to respond?
a lab student do to response should be, If doing so does not cause a delay in the evacuation, leave the room while removing your personal things. Observe the TA's and the lab staff's instructions.
Notify the emergency personnel of any other residents who require help leaving. Close the doors, leave the area, and dial 9-1-1 from a secure location. student can do the experiments they have learnt about in textbooks or from their professors in a scientific lab. They have a better understanding of an experiment's methodology and potential outcomes in this way. a location outfitted for scientific experimentation or for testing and analysis. a research centre. A location that allows for experimentation, observation, or practise in a particular field of study. The abbreviation lab comes from the mediaeval Latin word laboratorium.
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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
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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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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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.
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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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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Complete the following statements regarding the naming of the oxoanions containing chlorine.
a. ClO^- is the hypochlorite ion
b. ClO2- is the chlorite ion
c. ClO3- is the chlorate ion
d. ClO4- is the perchlorate ion
the following statements regarding the naming of the oxoanions containing chlorine.
a. ClO^- is the hypochlorite ion True
b. ClO2- is the chlorite ion-True
c. ClO3- is the chlorate ion-True
d. ClO4- is the perchlorate ion-True
An ion is an atom or molecule that has an unequal number of protons and electrons, giving it a net electrical charge. Ions can be positively charged (called cations) or negatively charged (called anions).The hypochlorite ion (ClO^-) is a negatively charged ion that contains one chlorine atom and one oxygen atom. It is formed when chlorine gas dissolves in water or when electrolysis is applied to saltwater. Hypochlorite ions can act as oxidizing agents and are used in various cleaning and disinfecting products.The chlorite ion (ClO2^-) is a negatively charged ion that contains one chlorine atom and two oxygen atoms. It is formed by the oxidation of chlorine dioxide and it is an intermediate product during the bleach production. Chlorite ions are also used as a sanitizing agent and water treatment.
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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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Which of the following best describes the expected product of the reaction H3O+below? A) An epoxide B) A secondary alcohol C) A primary alcohol D) A tertiary alcohol
The expected product of the reaction H3O+ is: C) A primary alcohol
H3O+ is a protonated water molecule, also known as a hydronium ion. When an alcohol molecule is treated with H3O+, it can undergo an acid-catalyzed reaction called an "alcohol dehydration" which results in the removal of a molecule of water and the formation of an alkene. The H3O+ acts as an acid, donating a proton (H+) to the alcohol molecule, which results in the formation of an alkyloxonium ion intermediate. This intermediate then loses a molecule of water to form an alkene.The product of the reaction is affected by the type of alcohol that is present in the reaction. In the case of a primary alcohol, it will lose water to form an alkene and a primary alcohol will lose water to form an alkene with one less carbon atom than the alcohol. A secondary alcohol and a tertiary alcohol will lose water differently and will not form an alkene, instead, they will form a carbocation intermediate which is not a stable species and will react further with other reagents to form other products.An epoxide is a cyclic ether and it is not formed from the reaction of an alcohol with H3O+.
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aluminum is the element that is best represented by the six successive ionization energies listed because
Because it only needs to lose one electron in order to create the next valence electron shell, the stable 3s shell.
What is an ionization energies?Ionization energy is the least amount of energy required to release the loosely bound electron from an isolated gaseous atom, positive ion, or molecule.Ionization energy is a measure of the difficulty of removing an electron from an atom or ion or the propensity of an atom or ion to give up an electron. Typically, when a chemical species is in its ground state, an electron is lost.The amount of energy required to remove an electron from an atom is referred to as ionization energy. As we move along a group, the ionization energy diminishes.One isolated, gaseous atom in the ground electronic state must absorb a certain amount of energy in order to discharge an electron and produce a cation. This energy is known as the ionization energy. The amount of energy required for each atom in a mole to lose one electron is measured in kJ/mole, or kJ/mol.To learn more about ionization energies refer to:
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explain why an intersitial alloy would not form a stable crystal sctructer if the component atoms were of similar size. sketch a diagream to illustrate your answer
Naming of the following compound is given below.
What is chemical compound?
A chemical compound is a substance composed of two or more elements in a fixed ratio. Chemical compounds can be formed when atoms of two or more elements combine chemically. Examples of chemical compounds include water (H2O), table salt (NaCl), and carbon dioxide (CO2). Compounds are usually identified by their chemical formula, which describes the ratio of atoms present.
2,5-Dibromobenzene: A compound composed of six carbon atoms arranged in a ring structure, with two bromine atoms bonded to the two carbon atoms in the center of the ring.
3,6-Dibromobenzene: A compound composed of six carbon atoms arranged in a ring structure, with two bromine atoms bonded to the two carbon atoms at either end of the ring.
1,4-Dibromobenzene: A compound composed of six carbon atoms arranged in a ring structure, with two bromine atoms bonded to the two carbon atoms located adjacent to each other in the center of the ring.
2,5-Dibromocyclohexene: A compound composed of six carbon atoms arranged in a ring structure, with two bromine atoms bonded to the two carbon atoms located across from each other in the middle of the ring.
1,4-Bromocyclohexene: A compound composed of six carbon atoms arranged in a ring structure, with one bromine atom bonded to the two carbon atoms located adjacent to each other in the center of the ring.
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Which is the correct equation for K?
Answer:
uncomplete question
Explanation:
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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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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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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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.
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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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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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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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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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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