One mole of fluorine gas consists of Avogadro's number (6.022 x 10^23) of fluorine molecules. Each molecule of fluorine consists of two atoms of fluorine, so there are a total of 2 x 6.022 x 10^23 = 1.204 x 10^24 atoms of fluorine in one mole of fluorine gas.
Calculate the mass of 1 mole of fluorine gas?The atomic mass of fluorine is 19.00 g/mol, so one mole of fluorine gas has a mass of 19.00 g.
How many fluorine atoms are in this sample?To find the number of atoms in a sample of fluorine gas, we need to know the number of moles of fluorine in the sample. If the sample has a mass of m grams, then the number of moles of fluorine in the sample is m/19.00. The number of atoms in the sample is then given by the number of moles multiplied by Avogadro's number.
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Sugars are carbohydrates. The image below is a model of a sugar called glucose.
Glucose can be found in foods like honey. It goes through chemical reactions with oxygen, which forms new molecules and provides energy for cells. The correct option is D.
What is the reaction in glucose?Glucose, a form of sugar generated after the digestion of carbohydrates and other nutrients, is transported throughout the body via the bloodstream and gives cells energy.
Glycogen is mostly stored as an energy reserve in the liver. To maintain blood sugar levels within a normal range, the levels of insulin, glucagon, and other hormones increase and decrease.
Therefore, the correct option is D. It goes through chemical reactions with oxygen, which forms new molecules and provides energy for cells.
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The question is incomplete. Your most probably complete question is given below: the image for the full question is added.
how many lone pairs of electrons are found on the indicated atom?
Answer:A single lone pair can be found with atoms in the nitrogen group, such as nitrogen in ammonia. Two lone pairs can be found with atoms in the chalcogen group, such as oxygen in water. The halogens can carry three lone pairs, such as in hydrogen chloride.
Explanation:A single lone pair can be found with atoms in the nitrogen group, such as nitrogen in ammonia. Two lone pairs can be found with atoms in the chalcogen group, such as oxygen in water. The halogens can carry three lone pairs, such as in hydrogen chloride.
Only 1 lone pair of electrons is found on the indicated atom.
What are electrons?
The elementary electric charge of the electron is a negative one, making it a subatomic particle. Due to their lack of components or substructure, electrons, which are part of the lepton particle family's first generation, are typically regarded to be elementary particles. The mass of an electron is roughly 1/1836 that of a proton. The electron's inherent angular momentum (spin), which is measured in terms of the decreased Planck constant, has a half-integer value. Since electrons are fermions, the Pauli exclusion principle states that no two electrons may be in the same quantum state.
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If one electron in an atom is excited but does not have enough energy to escape, the energy of the excited electron must have one of a set of quantized values.a. Trueb. False
What is the balanced net ionic equation of mixed AgNO3 and MgCl2 solutions?
A. Ag+(aq) + Cl–(aq) → AgCl(s)
B. Ag+(aq) + Cl2–(aq) → AgCl2(s)
C. Mg2+(aq) + NO3–(aq) → Mg(NO3)2(s)
D. Ag3+(aq) + 3Cl–(aq) → AgCl3(s)
Answer:
The balanced net ionic equation of mixed AgNO3 and MgCl2 solutions is Mg2+(aq) + 2Cl–(aq) → MgCl2(s). AgNO3 and MgCl2 are both ionic compounds and the reaction is a double replacement reaction. AgNO3 is composed of silver ions (Ag+) and nitrate ions (NO3–) while MgCl2 is composed of magnesium ions (Mg2+) and chloride ions (Cl–). When these two compounds are mixed together, the silver and nitrate ions react with the magnesium and chloride ions to form the silver chloride (AgCl) and magnesium chloride (MgCl2) products.
During this activity you may have noticed that not all of the data provided in the models fol- lowed the trends.
a. Identify two places in Model 1 where the property listed does not t the trend identi ed in this activity.
b. Why is it still bene cial for chemists to understand as many periodic trends as they can?
c. Propose an explanation for one of the exceptions you identi ed in part a. Use your knowledge of atomic structure and Coulombic attraction in your hypothesis.
a. In Model 1, the Atomic Radius of Li (1.81 Å) and Cs (2.98 Å) do not fit the trend of increasing atomic radius from left to right.
What is atomic radius?Atomic radius is a measure of the size of an atom. It is defined as one-half the distance between two nuclei of the same atom. It is typically measured in picometers (pm), which is a unit of length equal to one trillionth of a meter. Atomic radius can be determined experimentally or theoretically. Experimentally, it can be measured using X-ray diffraction or neutron diffraction. Theoretically, it can be calculated using quantum mechanical models.
b. It is beneficial for chemists to understand as many periodic trends as they can because it helps them understand the behavior of different elements and predict how they will react with other elements.
c. One explanation for the exception of Li and Cs in Model 1 is that Li and Cs are both in the same period, which means that they have the same number of electron shells and energy levels.
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what is the molar mass of a substance that has a mass of 40 grams and a molar amount of 0.8 moles
Answer:
The molar mass is 0.02 g/mol
Explanation:
The molar mass is the mass of a given chemical element or chemical compound (g) divided by the amount of substance (mol).
[tex]M=\frac{n}{m}[/tex]
We are given
[tex]m=40[/tex] g
[tex]n=0.8[/tex] mol
Substituting our values into the equation gives us
[tex]M=\frac{0.8}{40}[/tex]
[tex]M=0.02[/tex] g/mol
which of the following is not major peak in the ms of isopentanea-43b-72c-60d-29e-57
The option (a), is not the major peak in the ms of isopentane
Isopentane, also called methylbutane or 2-methylbutane, is branched-chain saturated hydrocarbon (an alkane) with five carbon atoms, with formula C5H12 or CH(CH3)2(C2H5). Isopentane is extremely volatile and extremely flammable liquid at room temperature and pressure.
Isopentane is a colorless liquid with an alcohol or gasoline-like odor. It is used as a solvent, and as blowing agent in making plastics.
The most intense peak in the mass spectrum is the base peak & is given the value of 100 & intensities of other peaks are expressed relative to this. The base peak in most of the cases is due to molecular ion and is helpful in determining the molecular weight of the compound
The difference between isopentane and neopentane structure is that isopentane consists of four-membered carbon chain with single methyl group that was attached to this chain at second carbon atom. On other hand, neopentane contains four methyl groups attached to carbon atom at centre
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chemicals x and y (both gases) react to form the gas xy, but it takes a bit of time for the reaction to occur. both x and y are placed in a container with a piston (free to move), and you note the volume. as the reaction occurs, what happens to the volume of the container? explain.
As the reaction between the two gases proceeds, the volume of the container will decrease due to the formation of a new gas, XY, which takes up less space than the two gases combined.
In a closed system, the decrease in volume is accompanied by an increase in pressure, as the molecules of XY have less space to move around in than the molecules of X and Y.
This is because the increased pressure will cause the molecules to move faster, thereby increasing the kinetic energy of the system. This increase in temperature will cause the reaction to speed up, leading to more molecules of XY being formed. As the reaction continues, the pressure, temperature, and volume will continue to change in a dynamic equilibrium until all the reactants are used up.
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water is very unique because its solid phase is less dense than its liquid phase. why do lakes freeze top down chemistry
Ice continues to float on the surface of the lake because it resides in an open crystalline lattice with vast "gaps" that reduce its density compared to liquid water where the molecules are close together.
Ice has a crystalline composition. This crystalline structure is preserved via hydrogen bonds. The ice molecules are pushed further apart as a result of the hydrogen bonds' orientation. Large gaps are consequently made in this structure. As a result of the closer spacing between water molecules in liquid form, ice has a lower density than liquid water. Ice is hence less thick than water.
Water experiences the phenomenon when it becomes even colder. Water starts to expand at temperatures below 4° Celsius (39°F) and gets less dense as it gets colder. Because of this, when water is almost frozen, the colder water floats to the top and the warmer water sinks to the bottom. The coldest water eventually freezes to form an ice layer after floating to the top of the lake during winter. As soon as the water turns to ice, the ice loses a lot of its water-like density and continues to float on the lake's surface.
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The name of PCl3 is
a) potassium chloride
b) phosphorus trichloride
c) phosphorus (III) chloride
d) monophosphorus trichloride
e) trichloro potassium
The white fuming liquid phosphorus trichloride (also known as PCl3) interacts aggressively with water to release phosphoric acid & hydro chloride (HCL) gas. The best choice is B.
Why is phosphorous trichloride (PCl3) named that?Aluminum, which has a number of valence electrons of 3, reacts with chlorine to generate the compound aluminum chloride. It is steady. However, the valencies of phosphorus are 3 and 5. As a result, it is also known as phosphorous pentachloride and phosphorous trichloride.
How is PCl3 produced?White phosphorus elemental undergoes direct chlorination to generate trichloride (P4). Exothermic in nature, this reaction happens continuously. While a steady stream of chlorine is introduced to the reactor, phosphate is added to a boiling combination of phosphorus and trichloride.
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explain why ethanol (c2h5oh) is not solube in cyclohexane (c6h12)
Because ethanol is not soluble in cyclohexane, the two molecules cannot combine. Because of hydrogen bonding, ethanol has significant intermolecular forces of attraction.
Cyclohexane is a nonpolar molecule, whereas ethanol is a polar, hydrogen-bonding molecule. The reason why ethanol is insoluble in cyclohexane is because the molecular attraction between ethanol molecules is significantly stronger than the attraction between ethanol and cyclohexane molecules. It is less advantageous from an energy standpoint for the alcohol to dissolve because the lengthy hydrocarbon chain cannot establish hydrogen bonds with water. A colourless, movable liquid with a light, sweet smell is cyclohexane. In addition to being somewhat soluble in alcohol, acetone, benzene, ethanol, ethyl ether, olive oil, and carbon tetrachloride, it is also somewhat soluble in water.
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How can you successfully measure 100. of water using the given devices?
Which one of the following?
O Create a length relationship on the can using the following method: Use the ruler to measure the length of the juice can from top to bottom, place a mark that represents the ratio (100. mL water/300. mL can) of the length of the can, and then fill the can to this mark with water to make your cake with the required 100 mL of water.
O Create the conversion factor 300. mL /z oz using the following method: Fill the juice can with water, and pour all of it into the measuring cup. Read the equivalent number of z oz on the cup to create a ratio between 300. mL of water and z oz of water. Use this ratio as a conversion factor (300. mL /z oz) to find the number of ounces required to make your cake.
O Create the formula 100. mL/300. mL × w oz using the following method: Fill the 2-cup (16-oz) measuring cup to capacity, and then pour water into the juice can to fill it. Note the volume remaining in the measuring cup (w oz), and use the formula 100. mL water/300. mL can× w oz of water to make your cake.
O Create the conversion factor z oz/300. mL using the following method: Fill the juice can with water, and pour all of it into the measuring cup. Read the equivalent number of z oz on the cup to create a ratio between 300. mL of water and z oz of water. Use this ratio as a conversion factor (z oz/300. mL ) to find the number of ounces required to make your cake.
The correct option to successfully measure 100 mL of water using the given devices is: O Create a length relationship on the can using the following method:
Use the ruler to measure the length of the juice can from top to bottom, place a mark that represents the ratio (100 mL water/300 mL can) of the length of the can, and then fill the can to this mark with water to make your cake with the required 100 mL of water. Hence option A is correct.
With this technique, a visual reference is made on the can itself. The can must be filled to the designated level, which represents the required amount of water (100 mL). Using this method, the necessary volume may be measured directly without the use of converters or other tools.
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Find the amount of heat in joules required to raise the temperature of 28.0 grams of water from 30.0°C to 60.0°C.
Answer: 3510 J
Explanation:
q = m x Cs x delta T
m = 28.0 g
Cs = 4.18 J/g x ⁰C
delta T = Final temperature - Initial temperature = 60.0⁰C - 30.0⁰C = 30.0⁰C
q = m x Cs x delta T
q = 28.0 g x (4.18 J/g x ⁰C) x 30.0⁰C = 3511.2 J
3510 J for the correct number of significant figures.
Grams and ⁰C cancel and you are left with Joules.
Which of the following compounds has both ionic and covalent bonding?
a. NaBr
b. Ba(CN)2
c. PCl5
d. CH3CH2OH
Ba(CN)₂ consists of both covalent bond between C and N also ionic bonds too as it has two ions Ba²⁺ and CN⁻.
Hence, the correct option is option b.
Ionic compounds are the compounds which are composed of ions which are held together by electrostatic forces known as ionic bonding. A covalent bond basically involves the mutual sharing of one or more pairs of electrons between the two atoms.
Among the given compounds, Ba(CN)₂ consists of both covalent bond as well as ionic bonds. Between the carbon and nitrogen atoms, there are 3 covalent bonds and the compound also has ionic bonding between its ions Ba²⁺ and CN⁻.
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Below are the balanced equations for the reactions in
Parts 1–3. Review the results of your experiments and look closely over the mole ratios of the chemical reactions. Do your experiments reflect the stoichiometric, molar amounts indicated by the reactions? Discuss this using the evidence from your experiments.
Cu(NO3)2 (aq) + 2NaOH(aq) —> Cu(OH)2 (s) + 2NaNO3 (aq) Note: Cu(OH)2 is a blue precipitate.
FeSO4 (aq) + 2NaOH(aq) —> Fe(OH)2 (s) + Na2SO4 (aq) Note: Fe(OH)2 is a dark green precipitate.
Fe(NO3)3 (aq) + 3NaOH(aq) —> Fe(OH)3 (s) + 3NaNO3 (aq)
Note: Fe(OH)3 is a red-
orange precipitate.
The reactants in the aqueous solutions gave rise to a precipitate.
What are the precipitates?We have to note that when we have two reactants that are in the aqueous states and then the reaction of the two substances that are in the aqueous state would lead us to the formation of a solid product, we can say that there have been the formation of a precipitate.
In this case we can see that experiments all led to the formation of the precipitates and that the stoichiometric of the precipitates agrees with the reaction.
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if the caffeine concentration in a particular brand of soda is 3.45 mg/oz, 3.45 mg/oz, drinking how many cans of soda would be lethal? assume that 10.0 g of caffeine is a lethal dose, and there are 12 oz in a can.
The cans of soda drun9 so that would be lethal is 242 cans. The result is obtained by using the formula for concentration of a solution.
What is the concentration of a solution?In a solution, the concentration can be calculated by
C = n/V
Where
C = mass concentrationn = mass of soluteV = volume of solutionSuppose we have a particular brand of soda contains caffeine with
Mass concentration, C = 3.45 mg/oz.Volume of soda in a can, V = 12 oz.The lethal dose of soda = 10.0 g.Find the number of cans of soda so that would be lethal!
The mass of caffeine in a can is
C = n/V
3.45 = n/12
n = 3.45 × 12
n = 41.4 mg
The number of cans of soda so that the mass of caffeine will reach the lethal dose is
10.00/n = 10.0 g/41.4 mg
10.00/n = 10.0 g/0.0414 g
10.00/n = 241.5
10.00/n ≈ 242 cans
Hence, it would be lethal is a person drinks 242 cans of the soda.
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Is Nickel (iii) sulfide Ionic or molecular/covalent?
Based on the nature of the chemical bonds present in the compound, Nickel (iii) sulfide is an ionic compound.
What are ionic compounds?
A chemical compound known as an ionic compound is one in which ions are bound together by electrostatic forces known as ionic bonding. Despite having both positively and negatively charged ions—known as cations and anions—the molecule is generally neutral.
In the compound nickel (iii) sulfide, the compound contains ionic bonds formed from positive nickel(iii) ions and the sulfide ion.
Hence, the compound is an ionic compound.
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what do you think would be the effect of firing a neutron into one of 100 atoms of uranium-235?
When a neutron is fired into one of 100 atoms of uranium-235, it can cause a chain reaction.
Uranium-235 is an isotope of uranium that is fissile, meaning it can undergo nuclear fission. When a neutron collides with a uranium-235 nucleus, it causes the nucleus to become unstable and break apart into two smaller nuclei and several additional neutrons. These additional neutrons then go on to collide with other uranium-235 nuclei, causing them to undergo fission as well, releasing more neutrons in the processThis process of neutron-induced fission can continue, releasing large amounts of energy in the form of heat and light, as well as radiation. The chain reaction can be controlled or made to stop by adding or removing neutrons from the system, making the neutron to nucleus collision less likely to occur.In a nuclear power plant, the chain reaction is controlled and the heat generated by the fission reactions is used to produce steam, which drives turbines to generate electricity. In a nuclear weapon, the chain reaction is uncontrolled, resulting in a much larger release of energy in a much shorter period of time.
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Question: The important hormone adrenaline, which has been seen in shows like Firefly and The Big Bang Theory, is synthesized in our bodies by what type of chemical reaction? a. Elimination b.SN_1 c. Sn_2 d. None of the above
The body's fight-or-flight response is triggered by adrenaline. Airways widen as a result of this reaction, giving the muscles the oxygen they require to either fight or flee danger.
Adrenaline also causes blood arteries to constrict, rerouting blood away from important muscle groups like the heart and lungs and toward them instead. a metallopeptide containing PtCl2 and coordinated platinum to the N epsilon-(DL-2,3-diaminopropionyl)-D-lysine residue [D-Lys(DL-A2pr)] at position 6, was 50 times more than that of the natural hormone. SB-95, [DL-A2pr(Sal2Cu)]6, Arg5, D-Lys[DL-A2pr(Sal2Cu)]6, D-Ala10] Rats' ovulation was completely inhibited by LH-RH at a dose of 3 micrograms when copper(II) was coordinated to the salicylideneimino moieties produced by the condensation of salicylaldehyde with D-Lys(DL-A2pr)6. Nal(2) is 3-(2-naphthyl)alanine, Pal(3) is 3-(3-pyridyl)alanine, The membrane receptors of rat pituitary and human breast cancer cells exhibited strong affinity for the majority of metallopeptide analogues of LH-RH.
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lidocaine is a common local anesthetic used to relieve minor pain, itching, and burning. the molecule has 4 double bonds and 1 ring. how many hydrogen atoms would be in lidocaine formula, c14h?n2o?
The Lidocaine formula contains 22 hydrogen atoms.
The chemical formula for Lidocaine is C14H22N2O. The 'C' represents carbon, 'H' represents hydrogen, 'N' represents nitrogen, and 'O' represents oxygen. Based on the formula, there are 14 carbon atoms, 22 hydrogen atoms, 2 nitrogen atoms, and 2 oxygen atoms. In total, the number of hydrogen atoms in the formula is 22.
The chemical formula represents the types and numbers of atoms present in a molecule, but not its 3D structure or exact arrangement of atoms. Lidocaine works by blocking nerve impulses and numbing the area it is applied to, making it a common local anesthetic used in various medical procedures.
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Please answer my question.
The missing values of the density and molar volume are given below:
Density = 1.55 g/cm³Molar volume =45.66 cm³/molDensity = 1.96 g/cm³What is the relationship between the volume and density of a substance?The relationship between the volume and density of a substance is given below:
Density = mass/volume
The required values are determined as follows:
Density = molar mass / molar volume
Density = 40.078 / 25.85
Density = 1.55 g/cm³
Molar volume = molar mass/density
Molar volume = 39.09/0.856
Molar volume =45.66 cm³/mol
Density = molar mass / molar volume
Density = 32.065/16.35
Density = 1.96 g/cm³
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2. What were the independent, dependent, and control variables in your investigation?
Type your answer here:
3. Write a hypothesis based on observations and scientific principles.
Type your answer here:
Experimental Methods
1. What tools did you use to collect your data?
Type your answer here:
2. Describe the procedure that you followed to conduct your experiment.
Type your answer here:
Data and Observations
1. Record your observations.
Type your answer here:
Conclusions
1. What conclusions can you draw about whether a visual, auditory, or tactile stimulus resulted in the shortest reaction time? Write an evidence-based claim.
Type your answer here:
2. Write a testable question that could be used to further investigate the topic of stimulus response time.
Type your answer here:
60 points
The scientific method is used by biologists and other scientists to pose inquiries about the natural world.
The first step in the scientific method is an observation, which prompts a question from the scientist. They then develop a theory—a verifiable explanation—that responds to the query.
A controlled experiment is a scientific test that is carried out under predetermined circumstances, meaning that only one (or a small number of) variables are altered at a time while all other variables are held constant. The element that differs between the experimental and control groups—in this case, the volume of water—is referred to as the independent variable. The response tested in an experiment to establish if a treatment had an impact is known as the dependent variable.
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a 1 liter aluminum cylinder at 5 degrees celsius is filled to the brim with gasoline at the same temperature. if the aluminum and gasoline are warmed to 65 degrees celsius, how much of the gasoline spills out?
If the aluminum and gasoline are warmed to 65 degrees Celsius, the gasoline will expand due to the increase in temperature.
The amount of gasoline that spills out will depend on the coefficient of linear expansion of the aluminum, which is approximately 2.3x10-5 K-1.
This means that for every degree Celsius increase in temperature, the volume of the aluminum cylinder will increase by 2.3x10-5. Thus, for a 10 degree Celsius increase from 5 degrees Celsius to 65 degrees Celsius, the volume of the cylinder will increase by 0.0023 liters. This means that approximately 0.0023 liters of gasoline will spill out.
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I am metalloid located in the third period. Who am I? Enter the element ymbol a your anwer with proper capitalization a hown on the periodic table
You are Silicon, with the element symbol Si.
Silicon is a metalloid, which is an element that has both metallic and non-metallic characteristics. It is located in the third period of the periodic table, and its atomic number is 14. Silicon is a very important element, as it is the second most abundant element in the Earth's crust, and is used in a variety of applications such as in the electronics industry.
Silicon is also the main component of many semiconductor materials, and is used in the manufacture of solar cells, computer chips, and integrated circuits. Silicon is also used in the production of glass, ceramics, rubber, and lubricants.
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which four territories provide the ""bottomless reserve of cheap labor"" (187)? what is ironicabout the exploited labor (188)
The four territories that provide the "bottomless reserve of cheap labor" were China, India, southeast Asia and parts of Africa. The irony of the exploited labor is that despite being the backbone of the global economy and contributing to the wealth of developed countries.
The four territories that provide the "bottomless reserve of cheap labor" referred to in 187 are likely to be countries or regions in the developing world with large populations and low wages, such as China, India, Southeast Asia, and parts of Africa.
These territories are often exploited by multinational corporations seeking to maximize profits by outsourcing production to these regions where labor is cheap and often unprotected by strong labor laws or unions.
The irony of the exploited labor is that despite being the backbone of the global economy and contributing to the wealth of developed countries, the workers in these regions often live in poverty and face harsh working conditions. They are paid low wages, subjected to long hours, and lack basic benefits such as health insurance and job security. The irony lies in the fact that the workers who are contributing to the wealth and prosperity of others are often themselves unable to enjoy a decent standard of living.
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what pressure would the butane gas sample have at 120 ml?
The pressure will the butane gas sample have at the volume of 120 mL is 186.6 atm.
At STP the standard temperature is 273 K
The pressure is 1 atm
The volume is 22.4 L
The Boyle's law is as follows :
P1 V1 = P2 V2
Where
The initial pressure ,P1 = 1 atm
The initial volume, V1 = 22.4 L
The final pressure, P2 = ?
The final volume, V2 = 120 mL = 0.120 ;
P1 V1 = P2 V2
1 × 22.4 = P2 × 0.120
P2 = 186.6 atm
Thus, the pressure will be 186.6 atm for the butane gas at the volume of 120 mL.
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In Three to five sentences, explain the two scientific claims regarding the depletion of ozone over Antarctica
When sunlight returns to Antarctica each year in September and October, this activation of chlorine and bromine causes ozone to rapidly lose its protective properties, creating the Antarctic ozone hole.
What is causing ozone depletion over Antarctica?Around the world, winds are constantly stirring the Earth's atmosphere. Because of this, wherever they are released, ozone-depleting gases mix with other airborne particles, including those from Antarctica. These gases are more effective at removing ozone from the atmosphere in Antarctica than they are anyplace else due to the region's unique meteorological conditions.The Northern Hemisphere has seen the majority of human emissions of bromine- and chlorofluorocarbon-containing gases like halons. In the latitudes corresponding to Europe, Russia, Japan, and North America, almost 90% of the satellites have been launched. Within a year or two, gases that are largely unreactive and insoluble in water, including CFCs and halons, are intermingled throughout the lower atmosphere.Mostly at tropical latitudes, the CFCs and halons in this well-mixed air rise from the lower atmosphere into the stratosphere. Winds then carry this air poleward, both north and south, from the tropics, ensuring that chlorine and bromine are present in almost equal levels throughout the whole global stratosphere.The South Pole is situated in the Southern Hemisphere within Antarctica, a very large land mass that is entirely encircled by water. This symmetry is represented in the weather patterns that permit the establishment of a particularly cold zone in the stratosphere over the Antarctic continent in winter. This region is isolated by a ring of strong winds that circulates around its perimeter. Polar stratospheric clouds, which occur as a result of the extremely low stratospheric temperatures, are responsible for chemical changes that encourage the synthesis of chlorine and bromine, two elements with chemical activity. When sunlight returns to Antarctica each year in September and October, this activation of chlorine and bromine causes ozone to rapidly lose its protective properties, creating the Antarctic ozone hole.To Learn more About sunlight returns Refer To:
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Which of the following would be modeled by small particles made up of atoms of two kinds of elements?
The following which would be modeled by small particles made up of atoms of two kinds of elements is water and is therefore denoted as option D.
What is an Element?A chemical element is a chemical substance that cannot be broken down into other substances.
The combination of two or more elements will result in the formation of a compound such as water. It is made up of atoms of two kinds of elements which are hydrogen and oxygen in the ratio 2 to 1 respectively which is therefore the reason why it was chosen as the correct choice.
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The full question:
Which of the following would be modeled by small particles made up of atoms of two kinds of elements?
A) gold
B) oxygen
C) neon
D) water
The rate constant for the first-order decomposition of H2O2 is 0.00020 s-1 at 35.0oC. Determine the percent of the H2O2 that has decomposed after 266 s
Answer:
4.8% of the H2O2 has decomposed
Explanation:
The first-order decomposition of H2O2 is described by the following rate equation:
rate = k[H2O2]
Where k is the rate constant, which is given as 0.00020 s-1 at 35.0oC.
To determine the percent of H2O2 that has decomposed after 266 s, we need to use the integrated form of the rate equation:
ln[H2O2]0 = -kt + ln[H2O2]t
Where [H2O2]0 is the initial concentration of H2O2, [H2O2]t is the concentration of H2O2 at time t, and t is the time in seconds.
To find the percent of H2O2 that has decomposed, we can use the following formula:
% H2O2 decomposed = (1 - [H2O2]t / [H2O2]0) x 100%
By plugging in the given values, we can calculate the percent of H2O2 that has decomposed:
% H2O2 decomposed = (1 - e^(-kt)) * 100%
% H2O2 decomposed = (1 - e^(-0.00020 s^-1 * 266 s)) * 100%
% H2O2 decomposed = (1 - e^(-0.0532)) * 100%
% H2O2 decomposed = (1 - 0.048) * 100%
% H2O2 decomposed = 4.8%
So after 266 seconds, 4.8% of the H2O2 has decomposed.
Based on what you've learned, derive another equation for Newton's second law that is written to solve for mass.
Answer:
Another equation for Newton's second law that is written to solve for mass can be derived by rearranging the original equation:
-> F = ma
Divide both sides of the equation by force:
-> a = m / F
And then rearrange the equation to solve for mass:
-> m = F / a
Final answer:
-> m = F / a
