Which aqueous solution has the lowest boiling point?a. 0.50 m MgBr2b. 0.75 m glucosec. 0.35 m NaCld. 0.20 m AlCl3
Answers
The aqueous solution with the lowest boiling point is option d. 0.20 m \(AlCl_3\).
This is because \(AlCl_3\) dissociates into three ions in water, while the other options only dissociate into two \(MgBr_2\), one (glucose), or do not dissociate at all (NaCl). The more ions a solute produces in solution, the greater the boiling point elevation. Therefore, the \(AlCl_3\) solution will have the greatest boiling point elevation, resulting in the lowest boiling point. A higher concentration of solute increases the boiling point of the solution by reducing the vapor pressure of the aqueous solution. Since \(AlCl_3\) has the lowest concentration, it has the lowest boiling point of the four solutions.
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Related Questions
Besides reduced ubiquinone, what other electron-carrying molecules that will accumulate in the presence of antimycin A?
a. succinate
b. NADH
c. NAD+
d. fumurate
Answers
In this context, besides reduced ubiquinone, the other electron-carrying molecule that will accumulate in the presence of antimycin A is NADH (option b).
Antimycin A is an inhibitor that specifically targets the electron transport chain (ETC) within the mitochondria. When antimycin A is present, it binds to and inhibits complex III (cytochrome bc1 complex) of the ETC. This inhibition disrupts the normal flow of electrons, leading to the accumulation of certain electron-carrying molecules.
NADH is produced during earlier stages of cellular respiration, specifically in the citric acid cycle and glycolysis. It donates its electrons to complex I (NADH dehydrogenase) of the ETC, initiating the electron flow. However, when complex III is inhibited by antimycin A, the electrons cannot be passed further along the chain, causing NADH to accumulate.
Succinate (option a) and fumarate (option d) are both involved in the citric acid cycle, but they do not directly carry electrons in the ETC. Instead, succinate is converted to fumarate by succinate dehydrogenase, producing reduced flavin adenine dinucleotide (FADH2) as the electron carrier. NAD+ (option c) is the oxidized form of NADH and will not accumulate since it is not an electron-carrying molecule in this context.
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CHEMISTRY 50 POINTS!
Which of the following explains the VSEPR geometry of a water molecule?
A) It is tetrahedral because there are four bonded pairs around oxygen.
B) It is bent because there are four bonded pairs around oxygen.
C) It is tetrahedral because there are two bonded pairs and two lone pairs around oxygen.
D) It is bent because there are two bonded pairs and two lone pairs around oxygen.
Answers
Answer: D
Explanation:
Water is comprised of 2 Hydrogen atoms and 1 Oxygen atom. This gives us a total of 8 valence electrons to form bonds with.
Because Hydrogen is in first row of elements it can only hold a total of two electrons. This means each Hydrogen holds 2 electrons.
But that means there are four more electrons. VSEPR theory is basically how electron repulsion causes atoms to arrange in different ways.
There will be four electrons left on the oxygen because they can not go anywhere else. This will cause the hydrogen molecules to move away from the lone electrons and cause a bent geometry rather than a straight-line geometry.
What forces typically hold ions together?
O A. Intermolecular forces
OB. Ionic attractions
OC. Metallic bonds
O D. Covalent bonds
Answers
Answer: Ionic attractions
Explanation:
Ionic bonding is a type of chemical bond that involves the electrostatic attraction between oppositely charged ions.
which of the following determine reaction rate in an enzyme-catalyzed reaction?multiple select question.the energy required to break existing bondsthe number of productsthe activation energy
Answers
The following determine reaction rate in an enzyme-catalyzed reaction are the activation energy the energy required to break existing bonds .
The energy required to break existing bonds, the activation energy and the presence of inhibitors all determine the reaction rate in an enzyme-catalyzed reaction.The reaction rate in an enzyme-catalyzed reaction is determined by a variety of factors.
The rate of an enzyme-catalyzed reaction is dependent on the amount of substrate present and the concentration of the enzyme. The activity of enzymes is also influenced by environmental conditions such as temperature and pH, which can have an effect on the three-dimensional structure of the enzyme and influence its catalytic activity.
The energy required to break existing bonds: Enzymes lower the energy required to break existing bonds in the reactant molecules, thereby facilitating the reaction.
The number of products: Enzymes increase the rate at which reactants are converted into products by accelerating the reaction steps.
The activation energy: Enzymes lower the activation energy required for the reaction to proceed, allowing it to occur more readily.
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The complete question is :
Which of the following determine reaction rate in an enzyme-catalyzed reaction?
Multiple select question.
the activation energy
the number of products
the energy required to break existing bonds
Consider the nuclear equation below. 239/94 Pu—-> X+ 4/2 He. What is X?
Answers
Answer:
X = U (Uranium)
Explanation:
Pu-->235/92 U + 4/2 He
The element X which is involved in the given nuclear reaction is ²³⁵₉₂U.
What is radio active decay?Radio active decay is a process in which an unstable nuclei will emit some particles from the nuclei in the form of energy to get stability.
In the given chemical reaction, parent nuclei (²³⁹₉₄Pu) will emit the alpha particle (⁴₂He) which has a atomic number 2 and atomic mass of 4 as a result of which we get a daughter nuclei Uranium which will get the atomic number 92 and atomic mass of 235.
²³⁹₉₄Pu → ⁴₂He + ²³⁵₉₂U
Hence the element X is uranium (²³⁵₉₂U).
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Write the configuration for electron: 4, 2, -1, +12
Answers
Answer:
-1
Explanation:
electrons are negative
Scientists are trying to understand the composition of substances on
different planets. Which best describes how scientists are probably working
on this problem?
O A. Scientists share information with other scientists who approach
the problem in the same way so that they get support for their
observations.
O B. Scientists study the problem in the same way because they have
similar backgrounds and share information with each other.
O C. Scientists with different perspectives approach the problem in
various ways, but they all make observations and look for
patterns.
O D. Scientists with the same perspectives use similar experiments so
that they can compare results and draw the same conclusions.
Answers
Answer:
I would say C
Explanation:
A graduated cylinder is filled to
25.0 mL with water and a piece of
silver is placed in the cylinder,
displacing the level to 54.8 mL.
What is the volume of the silver
piece in cubic centimeters?
[ ? ] cm3
pls help asap
Answers
final volume (with silver): 54.8 mL
1 mL = 1 cm3 (you can just change the units and the numbers will be the same)
volume of silver piece:
54.8 cm3 - 25.0 cm3 = 29.8 cm3
Given that the isoelectric point (pI) of a certain amino acid is 6.2, what is the net charge of this amino acid in a solution of pH 7.2
Answers
Without knowing the specific pKa values of the amino acid's functional groups, it is not possible to determine the exact magnitude of the net charge at pH 7.2.
If the pH of the solution is higher than the pI, the amino acid will have a net negative charge. If the pH is lower than the pI, the amino acid will have a net positive charge. At the pI, the amino acid is electrically neutral.
In this case, the pH of the solution (pH 7.2) is higher than the pI (6.2) of the amino acid. Therefore, the amino acid will have a net negative charge in this solution.
The further away the pH is from the pI, the stronger the net charge of the amino acid will be.
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if 30 ml of a stock solution of bacl2 can be mixed with water to prepare 150 ml of 0.3 mgml solution, what is the concentration of bacl2 in the stock solution in mgml? do not include units in your answer.
Answers
Answer:
310
Explanation:
A gas at 1.5 atm had pits ressure decreased to 0.50 atm producing a new volume of 750 ml what was its original volume
Answers
Answer:
The original volume of the gas is 0.001 mL
Explanation:
This easy excersise can be solved by the law for gases, about pressure and volume; the volume of a gas is inversely proportional to the pressure it exerts.
We can propose the rule by this formula:
P₁ / V₁ = P₂ / V₂
We replace data given: 1.50 atm / V₁ = 0.50 atm / 750 mL
As the rule says, that volume is inversely proportional, and the pressure was decreased, volume must be lower than 750 mL.
1.5atm / (0.5 atm / 750mL) = V₁
V₁ = 0.001 mL
The density of water is 1 g/cm3(1 gram per cubic centimeter); using this fact as a reference & Table c , how would you determine if an object sinks or float
Answers
Answer:
Explanation:
Any densities less than 1g/cm3 will float, while objects with densities over 1g/cm3 will sink.
a student investigated the factors that affect math grades. Which statement from the lab report best represents a conclusion for this investigation?
Answers
The correct answer choice from the statement above about investigated factors from lab results is :
Students who spend less time studying after school get lower math grade
Option D is the correct answer
What is mathlab?This is an online platform where mathematics tutors help students to solve their difficulties in mathematics.
Mathematics is one of the most important aspect of knowledge in the education.
So therefore, The correct answer choice from the statement above about investigated factors from lab results is :
Students who spend less time studying after school get lower math grade
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The cultures of prehistoric humans are known mostly through the excavation of stone tools and other relatively imperishable artifacts. The early tool making traditions are often referred to as being paleolithic (literally "Old Stone Age). The Oldowan and Acheulian tool traditions of the first humans were the simplest applied research basic research Scientihe thought O philosophies technologies
Answers
The cultures of prehistoric humans are primarily known through the excavation of stone tools and other durable artifacts, such as the Oldowan and Acheulian tool traditions.
Stone tools and imperishable artifacts serve as key archaeological evidence for understanding prehistoric cultures. Through meticulous excavation and analysis, archaeologists have been able to piece together the lifestyles, technological advancements, and social behaviors of early human societies. The term "paleolithic" refers to the Old Stone Age, a time when humans relied on stone tools as their primary implements.
The Oldowan tool tradition is considered the earliest stone tool industry, dating back around 2.6 million years ago. It is characterized by simple tools, such as choppers and scrapers, which were crafted by flaking off pieces from larger stones. These tools were primarily used for basic activities like butchering and processing animal carcasses.
Later, the Acheulian tool tradition emerged around 1.76 million years ago, representing an advancement in stone tool technology. Acheulian tools, such as handaxes and cleavers, were more refined and standardized, showcasing an increased level of sophistication in tool-making techniques. These tools served a wide range of purposes, including hunting, woodworking, and shaping raw materials.
By studying the Oldowan and Acheulian tool traditions, researchers gain valuable insights into the cognitive abilities, cultural development, and technological progress of early humans. The examination of these artifacts provides evidence of their adaptability, problem-solving skills, and the gradual refinement of their tool-making techniques over time.
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which of the following elements have seven valance electrons in its outer shell?
a. hydrogen
b. fluorine
c. magnesium
d. oxygen
Answers
Answer:
Flourine
Explanation:
Its at the 17 group number which are where the halogens are located.
Answer:answer in explanation
Explanation:
Easy fluorine
Forces and Motion:Question 1
Acceleration is the rate of change in an object's...
Select one:
force.
gravity.
ооо
velocity
mass.
Answers
Answer:
velocity
Explanation:
Acceleration is the rate of change of velocity with time.
Acceleration= velocity/time
Before trying to type quickly, what do you need to work on?
A. Accuracy
B. GWPM
C. Home row keys
D. Finger placement
Answers
You have to have your typing actually be accurate before trying to type fast.
A. Accuracy
yes the answer is A
If peanut butter wasn't called peanut butter.. what would it be called?
Answers
Answer:
I have no idea
Explanation:
The quantity of refrigerant in a system is less critical when the system has a(n).
Answers
The quantity of refrigerant in a system is less critical when the system has increased operating pressures.
A low coolant level can cause the engine to overheat. This can cause the compressor not to start or the circuit breaker to trip prematurely. If left unchecked, the engine will eventually burn out and completely stall. Refrigerants with a low critical temperature have a large decrease in cooling performance.
The critical temperature of the refrigerant should be higher than the condensing temperature to obtain greater heat transfer at a constant temperature. When the air conditioner runs low on refrigerant, it loses its ability to transfer heat from within. This means that the air that's being blown into your AC coil isn't cooling properly, so your vents will start circulating warm air throughout your home.
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Describe the work environment as a Biocurator in 3-4 sentences (where will this career take place)
HELP PLEASE ASAP
Answers
Answer:
Biocurator's are professional scientists. Their job is to curate, collect, annotate, and confirm information on biological and model organism databases. Their career takes place online through channels, websites, and other web services. They are important for scientific progress.
Explanation:
cite:
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5919672/
Time Limit: 0:25:00
Kelly Espinoza Gonzalez: Attempt 1
Question 5 (1 point)
Time Left: Time Exceeded
How many moles of iron (Fe) are in 279 g of iron?
O 0.2 mol Fe
15, 568 mol Fe
O 1 mol Fe
O 5 mol Fe
Answers
Iron has a molar mass of 55.84 grams/mole. So, five grams divided by 55.84 grams/mole gives us 0.089 moles of iron
How do you calculate moles?The unit is denoted by mol.The formula for the number of moles formula is expressed as.Number of moles formula is.Number of moles = Mass of substance / Mass of one mole.Number of moles = 95 / 86.94.1 mole is a number equal to. 022 x 10 23 particles, also known as the Avogadro's constant. To calculate the number of moles of any substance in the sample, we simply divide the given weight of the substance by its molar mass.One mole of a substance is equal to 6.022 × 10²³ units of that substance (such as atoms, molecules, or ions).To learn more about moles refers to:
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write difference between metallic and non metallic minerals
Answers
Metallic Minerals will be minerals in which metal components are available in their crude structure. Non-metallic minerals don't contain any metal substances in them. At the point when metallic minerals are dissolved another item is shaped. Non-metallic minerals are frequently discovered installed in youthful overlay mountains and sedimentary rocks.
Explain why one redwood tree has almost the same density as a whole forest of redwood trees.
Answers
The density of one redwood tree has almost the same density as a whole forest of redwood trees because density does not change with the shape, size, and mass of an object.
What is density?“Density is characterized as a mass of a unit volume of an object.”
d = m/v
Where m = mass and v = volume
It is expressed as gram per cubic centimeter.
Density is a property that does not depend upon the amount of substance present.
Thus, due to the fact that density is independent of an object's shape, size, and mass, one redwood tree has nearly the same density as an entire forest of them.
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iughy. hbh. bvjh. bh. bhi
Answers
carbon and tin are both in the fourth column of the table which would you expect to have the greater electronegativity
Answers
Answer: Carbon
Explanation:
electronegativity decreases when you go down a column
The study of chemical bonds is called chemistry.
The correct answer is carbon.
The more negative charge present on an atom shows the electronegativity.
The attraction of the nucleus to the proton is also referred to as electronegativity.
The smaller the radius more the electronegativity.
Hence, the correct answer is Carbon as it has fewer atoms and a smaller radius.
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determine whether the value of w or q is positive or negative in each scenario
- person rolls a bowling ball across the floor, where the bowling ball is defined as the system. (W)
- A person rolls a bowling ball across the floor, where the person is defined as the system. (w)
- An ice pack is placed on a person's sore back, where the ice pack is defined as the system. (q)
Answers
In scenario 1. the value of w, work done is positive. 2. the value of w is negative. 3. the value of w or q is positive or negative depending on the situation.
The terms in the given problem are w and q. Let us find out whether the value of w or q is positive or negative in each scenario. Person rolls a bowling ball across the floor, where the bowling ball is defined as the system. (W)In this scenario, the bowling ball has the energy, therefore, work is done on the floor. As the floor receives energy, it would have a positive work. Hence, the value of w is positive.
Person rolls a bowling ball across the floor, where the person is defined as the system. (w)In this scenario, the person has the energy. Therefore, the work is done on the bowling ball. As the bowling ball receives energy, it would have a negative work. Hence, the value of w is negative.
An ice pack is placed on a person's sore back, where the ice pack is defined as the system. (q)In this scenario, the transfer of heat occurs from a hot object (person's back) to a colder object (ice pack). As the heat transfer occurs from the person's back, which is the system, it would have a negative value of q. Hence, the value of w or q is positive or negative depending on the situation.
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What is the mass of a 2.5-mole sample of magnesium dioxide?
Answers
Answer:
140 g (to 2 sf)
Explanation:
The atomic mass of magnesium is 24.305 u.
The atomic mass of oxygen is 15.9994 u.
So, the gram-formula mass of magnesium dioxide, in g/mol, is
\(2(15.9994) + 24.305 = 56.3038\)
So, the mass of 2.5 moles is (56.3038)(2.5), which is equal to 140 g (to 2 sf)
which would be a suitable solvent to use for the mobile phase of a normal phase tlc
Answers
A suitable solvent to use for the mobile phase of a normal phase TLC is a nonpolar solvent, such as hexane or heptane.
In normal phase TLC (Thin-Layer Chromatography), the stationary phase is polar (usually a polar silica gel or alumina) and the mobile phase is nonpolar. The goal is to separate and analyze polar compounds based on their relative affinity to the stationary and mobile phases.
Since the stationary phase is polar, a nonpolar solvent is used as the mobile phase to ensure good separation and elution of the analytes. Nonpolar solvents like hexane or heptane are commonly employed in normal phase TLC as they have low polarity and do not strongly interact with the polar stationary phase. This allows the analytes to migrate and separate effectively based on their polarity.
Using a nonpolar solvent as the mobile phase ensures that the elution order of compounds is determined mainly by their polar interactions with the stationary phase, making it suitable for normal phase TLC.
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Why did acid make our teeth rot?
Answers
Explanation:
acid make our teeth rot because strong acid are corrosive
Acid makes your teeth rot because of the toxic chemicals inside of acid.
Where could you find hydrocarbon chains?
Answers
Answer: Most Hydrocarbon chains are found in petroleum, coal, and natural gas. First of all, a hydrocarbon chain is a molecule that consist of entirely hydrogen and carbon.
Explanation: There are many types of hydrocarbon chains, which can be found in alkanes, alkynes, arenes, alkenes, and cycloalkanes. Natural rubber for instance is a hydrocarbon that primarily consists of alternating single and double bonded carbons.