The molar mass is 151 g/mol.
What is Raout's law?The Raout's law is used to describe the relationship between the partial pressures of the solution and that of the solute. Given that we have the partial pressure of the pure solvent is 0.2630 atm and the partial pressure of the solution is 0.2474 atm
Using Raout's law;
Psolution = Psolvent * mole fraction
Number of acetone = 25.00 g/58.08 g/mol = 0.43 moles
Number of substance = 4.231 g/ MM
Where MM = molar mass
0.2474 atm = 0.2630 atm * Moles of acetone/Total number of moles
Let the Moles of substance be x
0.2474 atm = 0.2630 atm * 0.43/0.43 + x
0.2474 = 0.113/0.43 + x
0.2474(0.43 + x) = 0.113
0.106 + 0.2474x = 0.113
0.2474x = 0.113 - 0.106
x = 0.113 - 0.106/0.2474
x = 0.028
Then;
x = 4.231 / MM
0.028 = 4.231 / MM
MM = 4.231 / 0.028
MM = 151 g/mol
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Why is it uncommon for noble gases to form chemical bonds?
Noble gases are exceedingly stable and unlikely to form chemical connections since they have minimal inclination to receive or lose electrons, thanks to the complete valence electron shells of these atoms.
Any one of the seven chemical elements that compose Group 18 (VIIa) of the periodic table is referred to as a noble gas. Helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), radon (Rn), and oganesson are the constituent elements (Og). The noble gases are inflammable, tasteless, colorless, and odorless. The term "noble" has long been used in science and alchemy to describe how resistant metals like gold and platinum are to chemical reactions. As their atomic numbers rise, the abundances of the noble gases fall.
German chemist Friedrich E. Dorn discovered radon for the first time in 1900, and in 1904 it was recognized as a member of the noble-gas family. In 1904, the work of Rayleigh and Ramsay was recognized with Nobel Prizes.
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Which kind of change is NOT an indicator of a chemical reaction?
Color. A substance's changing color does not always mean that something has changed chemically. For instance, altering a metal's color does not alter its physical characteristics.
What is not a chemical reaction?A substance's shape is a physical attribute, and any modification of a physical property cannot be interpreted as a sign of a chemical modification.
In essence, a physical change does not result in the creation of a new material, whereas a chemical change does.
While undergoing a physical change, a material may change shape or form, but no chemical processes take place, and no new compounds are created.
Therefore, a change in color is not a sign of a chemical reaction.
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At What temperature in kelvin all the elements are solids except for
Answer:
Helium
Explanation:
What role do bacteria play in creating pimples
Answer: The bacterium Propionibacterium acnes is considered a key player in acne development. Studies have shown that P. acnes uses sebum as a source of energy, and its presence in the pores initiates an immune response that triggers inflammation
Explanation:
After an animal takes in nutrients to make needed materials what is the best explanation for what the cell will do next in order to maintain homeostasis
There are three primary ways that the animal cell membrane keeps things in balance: enabling the membrane to flow fluidly, controlling the process by which water moves from a high concentration to a low concentration, and maintaining particular ion concentrations.
Negative feedback loops keep homeostasis in check. Positive feedback loops may be necessary for life to exist even when they actually push the organism further away from homeostasis. The neural and endocrine systems of mammals regulate homeostasis.
For instance, an animal must use the thermoregulation mechanism to control body temperature. Cold-adapted organisms, like the polar bear, have physical characteristics that enable them to survive extreme cold and retain body heat. Fur, feathers, blubber, and fat have structures that help with this kind of insulation.
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Is the pressure of an ideal gas directly proportional to its absolute temperature?
The pressure of an ideal gas is directly proportional to its absolute temperature.
How are pressure of an ideal gas and temperature related?
The pressure of an ideal gas is directly proportional to absolute temperature at constant volume.The volume of a gas is also directly proportional to it's absolute temperature at constant pressure.
When a constant volume of gas is held, the pressure of gas increases as the temperature increases. Mathematically it can be expressed as:
P∞T
In order to remove proportionality sign an equal sign is introduced with a proportionality constant 'K',thus the equation becomes
P=KT
On dividing both sides of above equation by T , equation becomes
P/T=K
When a plot of pressure versus temperature is plotted a straight line graph is obtained passing through the origin.
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Consider the process of diluting 1.2 m nh4cl solution to prepare 1.4 l of a 0.25 m nh4cl solution. determine if each of the follow statement is true or false.
The process of diluting 1.2 m nh4cl solution to prepare 1.4 l of a 0.25 m nh4cl solution. To determine if each of the follow statement is true or false.
The assertion is true.
What is dilution?
By incorporating more solvent, dilution refers to the process of lowering a solute's concentration in a solution. We increase the solvent without increasing the solute in a solution to dilute it. After that, we vigorously mix the resulting solution to make sure that it is evenly distributed throughout.
The assertion is true.
(1) The equation for dilution
A balance of moles of the solute, in this case NH4Cl, is expressed as M1V1 = M2V2.
Calculating dilution involves using the M1V1 = M2V2 equation.The volume of the concentrated solution is denoted by M1, and M1 represents its molarity. The molarity is M2, and the volume of the diluted solution is V2.The conservation of moles principle serves as the foundation for this equation.To learn more about dilution from the given link below,
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A 100 gram gold nugget contains 5 grams of gold. what is the percentage of gold in the nugget?
A 100 gram gold nugget contains 5 grams of gold.
Then Percentage of gold in the gold nugget is
(5/100)*100 =5%.
What is Percentage ?A % in mathematics is a quantity or ratio that is stated as a fraction of 100 (from the Latin per centum, "by a hundred"). Although the abbreviations "pct.", "pct.", and occasionally "pc" are also used, the percent symbol, "%," is frequently used to indicate it. A % lacks dimensions and has no associated unit of measurement.
If there are 50 male pupils for every 100 overall students in the class, 50 of them will be male. There are 250 male students out of 500 total.
Long before the decimal system was developed, computations were frequently done using fractions that were multiples of one hundred.
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Which of the following example demonstrates the reversibility of a chemical change?
A. Refreezing carbon dioxide gas into dry ice
B the rotting of eggs
C. dehydrating sugar water
D. recharging batteries
The statement that shows an example that demonstrates the reversibility of a chemical change is rotting of eggs (option B).
What is a chemical change?A chemical change is any process in which reactants are changed into products by the breaking or creation of chemical bonds.
Chemical changes are opposed to physical change, which only affects the form of a chemical substance, but not its chemical composition.
Examples of chemical changes are as follows:
Burning of paper and log of wood.Digestion of food.Boiling an egg.Chemical battery usage.Electroplating a metal.Baking a cake.Milk going sourTherefore, it can be said that rotting process of an egg is an example of a reversible chemical change.
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Answer:
Recharging batteries.
I just took the quick check
Explanation:
If your here for the Physical vs. Chemical Change Quick check for Connexus, here are the answers.
1- Dry ice becoming vapor
2-iron (Fe) reacting to water((H2O)) and oxygen(O) to form iron oxide(Fe2O3)
3-conduct a test to determine the chemical makeup of the molecules
4-Atoms of one or more substances rearrange into a new substance.
5-recharging batteries
I took the quick check, and these were the answers!!
Hope this helps someone!
The ph of a 1.79 m solution of hydrocyanic acid (hcn) is 4.477. what is the percent dissociation of hydrocyanic acid under these conditions?
Now, write an equilibrium expression, Ka = [H +][CN -]/[HCN]. Ka = 4.9E-10 = x 2/(0.0620-x). Since the power of the Ka is -10, we can safely assume that the x is small enough to ignore compared to the 0.0620, so it becomes 4.9E-10=x 2/0.0620.
What is equilibrium?Aqueous solutions are ones in which water serves as the solvent. It is commonly represented in chemical equations by adding (aq) to the relevant chemical formula. For instance, Na+(aq) + Cl could be used to represent a solution of table salt (also known as sodium chloride, or NaCl) in water (aq).
The Latin word aqua is the source of the phrase aquatic, which means to be or to consist of water. Water is a common solvent in chemistry since it functions well as a solvent and is also easily accessible. Since water is usually used as the solvent in experiments, unless otherwise mentioned, the word "solution" frequently refers to an aqueous solution.
A solution where the solvent is a liquid is referred to as a "non-aqueous solution."
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Why is sandstone more likely than granite to form an aquifer?
A) The particles in granite are spaced further apart than is sandstone.
B) Sandstone forms where it rains more often.
C) Sandstone is more porous than granite.
D) Granite repels water away from its surface.
Which of the following pieces of lab equipment would be used to measure volume?
Hot plate
Electronic balance
Test tube
Graduated cylinder
Tom adds solid sodium hydroxide to a flask of water at room temperature. After he stirs the water, some of the
sodium hydroxide dissolves, however, a small amount of sodium hydroxide still remains at the bottom of the flask.
He heats the flask of sodium hydroxide and water for 10 minutes, and the sodium hydroxide on the bottom of the
flask disappears. How does heating the water cause the remaining sodium hydroxide to disappear?
Answer: It has a lower boiling/melting point than the water
Students are conducting an experiment to see what colors different salts turn when they are burned. Jack dares Rebecca to
taste the other salts to see if they taste like regular table salt.
Students are conducting an experiment to see what colors different salts turn when they are burned. Jack dares Rebecca to taste the other salts to see if they taste like regular table salt. She agrees and her mouth starts burning. Rebecca needs to learn how to behave in the class.
When you add salt to a fire, the flame's color will alter. This isn't because the salt is burning; rather, it happens because the flame's heat affects the energy of the salt's electrons, which causes photons of light to be released. When salt is "burned," a golden flame is frequently visible.
High blood pressure is known to increase the risk of stroke and other health issues, and it is also known to increase the chance of burning in salt. High salt consumption has also been linked in several studies to deteriorating brain function. So, if this occurs, plan for brain surgery and a dedicated teacher to assist the student with wiping and peeling bananas.
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Which is not evidence of a chemical change?
New odor present
Gas forming
boiling water
Bright light emitted
Answer:
Boiling Water
Explanation:
Boiling water is a physical change because the gaseous water produced is chemically identical to the liquid water i.e both of them have the same molecular structure of the water
Determine the number of protons, neutrons, and electrons present in each of the atoms. cr53 protons: neutrons: electrons: ru103 protons: neutrons: electrons:
Chromium(Cr)53 has 24 protons, 24 electrons and 29 neutrons. Ruthenium(Ru)103 has 44 protons, 44 electrons and 59 neutrons.
In any atom, the atomic number, usually denoted with the letter Z, is always equal to the number of protons. For instance, if an atom has the atomic number 10, it will also have 10 protons. In a neutral atom, the number of protons is equal to the number of electrons. To get the number of neutrons, we subtract the number of protons from the atomic mass. The atomic mass or mass number is the addition of the number of protons and neutrons.
Chromium(Cr) 53In the question, we are only given the atomic mass - 53. To know the number of protons, we need to get the atomic number. On the periodic table, Chromium (Cr) is element number 24 (which is the atomic number) hence, it also has 24 protons. Since the atom is neutral, it will also have 24 electrons. To get the number of neutrons, we subtract 24 from 53, which will give us 29 neutrons.
Ruthenium(Ru) 103Ruthenium (Ru) has the atomic number 44, showing that it has 44 protons. It is also a neutral element, so it will also have 44 electrons. The atomic mass we are given in the question is 103. Therefore, to get the number of neutrons, we subtract 44 from 103, which will give us 59 neutrons.
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How can electrical conductivity be used to determine bond type? (In your CER make sure to also explain why different bonds behave differently) 1 claim 3 reasoning and 3 evidence
Electrical conductivity can be used to determine the bond type because there are valence electrons that are not able to conduct electricity while free electrons can conduct electricity.
What are valence electrons and free electrons?The valence electrons can be defined as those having a negative charge that are linked to atomic particles, while the free electrons do not form atomic particles in the sense they are unbound to atomic particles.
In conclusion, electrical conductivity can be used to determine the bond type because there are valence electrons that are not able to conduct electricity and while free electrons can conduct electricity.
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What is the most abundant isotope of Iridium (Ir)?
Question 1 options:
Iridium-77
Iriduium-192
Iridium192.22
The most abundant isotope of iridium is Iriduium-192.
What is the most abundant isotope?An element is composed of isotopes. The isotopes of an elements have different mass numbers but the same atomic number. These difference in the mass number is caused by differences in the number of neutrons.
Hence, we can see that all elements do have isotopes. The chemical and physical properties of isotopes may be the same save that the rate of reaction of the individual isotopes may slightly differ. The most abundant isotope has the highest length in the mass spectrum.
We can see that there are three isotopes of Iridium that are common. The most abundant isotope of iridium is Iriduium-192.
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The reaction of 5.0 g of cuso4 with excess sodium hydroxide produced 2.6 g of cu(oh)2. what percent yield of cu(oh)2 was obtained?
percent yield of Cu (OH)2 is 85%
CuSO4 + 2 NaOH >>> Cu (OH)2 + Na2SO4
What is Cu Oh 2's theoretical yield?Cu (OH)2 theoretical yield = 0.09 mol NaOH x 1 mol Cu (OH)2 = 4.39 g Cu (OH)2 = 4 g Cu (OH)2 calculate percent yield Cu (OH)2 / 2 mol NaOH x 97.6 g Cu (OH)2/mol = 4.39 g Cu (OH)2 = 4 g Cu (OH)2.calculate the percentage yield
First, ensure that both weights are in the same units.Divide your experimental yield by your theoretical yield.To calculate the percent yield, multiply this value by 100.The actual yield is the amount of product produced from a given amount of reactant. The percent yield is calculated by dividing the actual yield by the theoretical yield and multiplying by 100%. Percent yield = actual yield / theoretical yield multiplied by 100%.Since 65.13% of the mass of Cu (OH)2 is due to copper the mass of copper in 400 grams of Cu (OH)2 can be calculated by the equation below.
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Azt, used in the treatment of aids, has the following structure. what is the molecular formula for azt? c9h14n5o4 c9h9n5o4 c9h12n5o4 c10h13n5o4 c11h12n5o4
Hence , the molecular formula for azt is C₁₀H₁₃N₅o₄ which is option (d) .
The full type of nucleoside reverse transcriptase inhibitor may be azidothymidine that is additionally known as as AZT is a sort of drug that is employed to delay the event of AIDS within the patients that area unit laid low with HIV(human immunological disorder virus). The cluster of medicine from wherever nucleoside reverse transcriptase inhibitor belongs is thought as glycoside polymerase inhibitors.The formula is associate in nursing expression that defines the amount of atoms of every component in one molecule of a compound.It shows the particular variety of every atom in a very molecule.The molecular formula for azt is C₁₀H₁₃N₅o₄
In this formula, there area unit 10 carbon atoms and 13 H atoms and 5 nitrogen atoms and 4 oxygen atoms within the given compound.
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What is the major organic product that results when hept-1-yne is treated with 2 equivlents of hbr
The major organic compound is 2,2-dibromoheptane.
Any of a vast group of chemical compounds known as organic compounds contain one or more carbon atoms that are covalently connected to atoms of other elements, most frequently hydrogen, oxygen, or nitrogen. Carbides, carbonates, and cyanides are among the few carbon-containing substances that aren't categorized as organic.
Organic compounds make up about one-third of all industrially manufactured substances. Organic compounds make up the majority of foods, medications, clothing fibers, and plastics, as well as all living things. Many different fields can benefit from the identification of organic molecules. Scientists have just created a new technique dubbed "material degradomics" to track the deterioration of antiquated books and historical artifacts. Paper develops the well-known "old book smell" when it ages due to the emission of organic chemicals in gaseous form.
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In one or two sentences, explain how Rutherford’s model of an atom changed scientific knowledge and describe the evidence that justified the model.(2 points)
Rutherford’s model of an atom changed scientific knowledge through his assumptions that the atom was made up of a nucleus with positively charged particles.
What is an Experiment?This is defined as a procedure which is carried out by scientists in other to support or refute a hypothesis and also to ascertain its authenticity through various processes.
Rutherford bombarded a piece of gold foil with alpha particles which also has a positive charge and he discovered almost all the particles went through it.
This made him infer that the gold atoms were mostly empty space thereby leading him to propose his model of atom and made scientists discover that there was proton present in the nucleus of an atom which was used as a foundation by others in discovering more information and details about an atom.
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A solution of dispersant is made by taking 15.0ml of a 50.0 mg ml -1 solution of tween 80 and mixing it with 50.0 ml of water. calculate the final concentration of the tween 80 in this solution
In terms of grammes per millilitre, the final Randyne concentration was 0.011 g/mL.
Knowing that C1V1 = C2V2 means that C1 and C2 are the concentrations of solutions 1 and 2, respectively.
V1 and V2 are, respectively, the volumes of solutions 1 and 2.
We obtain - mg/mL by substituting the given values.
The final concentration of the solution is 0.11 g/ml.
What is a solution?
A solution is a uniform mixture of two or more components with particles smaller than one nanometer. There are many different types of solutions, such as soda water, salt-and-sugar solutions, and others. In a solution, each component appears as a separate phase.There is particle homogeneity, or a uniform distribution of the particles. This explains why a soft drink bottle's entire contents have the same flavour.
In terms of grammes per millilitre, the final Randyne concentration was 0.011 g/mL.
Knowing that C1V1 = C2V2 means that C1 and C2 are the concentrations of solutions 1 and 2, respectively.
V1 and V2 are, respectively, the volumes of solutions 1 and 2.
We obtain - mg/mL by substituting the given values.
In terms of grammes per millilitre, the final Randyne concentration was 0.011 g/mL.
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Which statement best describes the difference between dissolution and melting? (1 point)
O Dissolution involves the formation of a new substance, while melting involves a state change.
O lonic compounds dissolve, while polar compounds melt.
O Polar compounds dissolve, while ionic compounds melt.
O Dissolution involves a state change, while melting involves the formation of a new substance.
The statement which best describes the difference between dissolution and melting is that dissolution involves the formation of a new substance, while melting involves a state change and is denoted as option A.
What is Dissolution?This is the process in which a solute dissolves in a solvent such as water to form a solution thereby resulting in a new substance being created.
Melting on the other hand is the process in which a solid phase is changed into a liquid phase with the application of heat which makes the atoms move more freely.
This is therefore the reason why option A was chosen as the most appropriate choice.
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Carbon is essential to the structure of every organic compound.
a. true
b. false
answer:
a. true
explanation:
carbon is found in all organic compounds; it's the main compound. it's essential to life and without it earth would be nonexistent.
Consider the pka of phosphoric acid (h3po4), the catalyst used in this reaction. could acetic acid be used as a catalyst in the reaction instead of phosphoric acid? explain why or why not. (3 pts)
Phosphoric acid has emerged as a novel chiral Brønsted acid catalyst since 2004. Chiral Brønsted acid protonates imines, thereby forming iminium salt bearing a chiral counter anion, and directs the attack of the nucleophile to the iminium salt.
What is Phosphoric acid?With the chemical formula H3PO4, phosphoric acid, also known as orthophosphoric acid, monophosphoric acid, or phosphoric(V) acid, is an inorganic solid that contains phosphorus. Colorless and odorless, phosphoric acid is a substance. In its most common form, an 85% aqueous solution, it appears as a syrupy liquid that is colorless, odorless, and non-volatile. Considering that many fertilizers include it, it is a significant industrial chemical.
Acid makes up the substance. The phosphate ion PO results from the removal of all three H+ ions. H2PO, or hydrogen phosphate, is produced when one or two protons are removed, correspondingly. Organophosphate esters are produced by phosphoric acid.
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Please help, this is due tomorrow and I don’t understand.
The accepted value for the
density of iron is 7.874
g/cm^3. Give two examples
of a measurement for density
that would be accurate?
it can change everything
What is the iupac name for the following compound? 3,5-dimethylheptanedioic acid
The iupac name for the following compound is 3,5-dimethylheptanedioic acid
The worldwide organization that represents chemistry and allied disciplines and technology is called the International Union of Pure and Applied Chemistry (IUPAC).
The International Union of Pure and Applied Chemistry (IUPAC) is the foremost expert on chemical language and nomenclature, including the naming of new elements in the periodic table, standardized measurement techniques, atomic weights, and a wide range of other critically analyzed data.
A global standard for naming chemicals is to be established through the IUPAC system of nomenclature in order to improve communication. The system's objective is to assign each structure a distinct and clear name and to associate each name with a distinct and clear structure.
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is corrosion an adverse effect of chemistry
Answer:
yes
Explanation:
corrosion, wearing away due to chemical reactions, mainly oxidation (see oxidation-reduction, oxide). It occurs whenever a gas or liquid chemically attacks an exposed surface, often a metal, and is accelerated by warm temperatures and by acids and salts.
Identify a substance that is not in its standard state.
o3 h
o2
zn
xe
A substance that is not in its standard state is option(b) i.e, H.
The standard state of a substance occurring at the specified temperature and one atmosphere of pressure is the typical condition of a substance occurring in a condensed phase.
Eleven elements are gases in their standard state. Including all noble gases and the halogens fluorine and chlorine (He, Ne, Ar, Kr, Xe, Rn). Hydrogen (H), oxygen, and nitrogen make up the remaining three. All other elements are solid in their native state.
The concept of standard state conditions stipulates that liquids and gases must be pure, solutions must be at 1 M concentration, and 1 atm of pressure is used in STP calculations involving gases that resemble ideal gases. Although the temperature is not stated, most tables gather information at 25 degrees C. (298 K).
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