Answer:
0.278m/s (3sf) OR 0.28m/s (2dp)
Explanation:
1km = 1000m
1h = 3600s (60mins x 60 secs)
1000m/3600s (simplify)
10m/36s (simplify by dividing both sides by 36)
(1/36)m/s OR 0.27777777777ms/s
Round up:
0.28m/s (2dp) or 0.278m/s (3sf)
What proportion of z-scores fall between the z-score of -0.22 and a z-score of 1.7?
a) 0.4554
b) 0.0871
c) 0.5425
d) 0.4129
The proportion of z-scores fall between the z-score of - 0.22 and a z-score of 1.7 is 0.5425.
When assessed in terms of standard deviation units, a raw score's location in relation to its distance from the mean is indicated by a z-score. The z-score is positive when a value is above the mean and negative when a value is below the mean.
Because it standardizes the distribution, it enables comparison of scores on many types of variables, hence the name "standard score." A normally shaped distribution with a mean of 0 and a standard deviation (SD) of 1 is known as a standard normal distribution (SND).
The two z scores given are -0.22 and 1.7.
Now, according to the z score value table, we get;
For z score value - 0.22,
The area between the mean and z is 0.0871.
For a z score value of 1.7,
The area between the mean and z is 0.4554.
Then the proportion of z scores falling between the z score of - 0.22 and a z score of 1.7 will be:
0.0871 + 0.4554 = 0.5425
The correct option is (c).
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Very long and large organic molecules called ___ are made of small units called ___.
Very long and large organic molecules called Polymer are made of small units called Monomer
polymer is a long molecule consisting of many similar or identical building blocks linked by covalent bonds on the other hand monomer is the building blocks that make up a polymer.
The mechanism of creating a polymer from monomers is chemically combining 2 monomers together by removing a water molecule called dehydration and thus creating a covalent bondhydrolysis is exact opposite of dehydration synthesis (add water to polymer to break polymer down into monomer)Cellulose is a structural polysaccharide. Major component of walls of plant cells.To know more about polymer visit : https://brainly.com/question/14600435
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n‑methyl‑2‑pyrrolidone is an aprotic solvent used in many industrial processes. draw the structure of the product formed when it is heated with aqueous acid.
The structure of n‑methyl‑2‑pyrrolidone when it is heated with aqueous acid. product is given below
What is aprotic solvent?A polar solvent without an acidic proton is known as a polar aprotic solvent. These solvents don't include hydroxyl or amine groups. These solvents can act as proton acceptors, but unlike protic solvents, they do not act as proton donors in hydrogen bonding.
After being exposed to a strong aqueous acidic media and being heated, N-methyl-2-pyrrolidone opens up, forming a molecule with a carboxylic group at one end and a protonated nitrogen atom with a methyl group connected to it at the other.
Alcohol, water, hydrogen fluoride, formic acid, acetic acid, ammonia, methanol, ethanol, and other well-known substances are a few examples of polar protic solvents. Polar aprotic solvents, on the other hand, lack acidic protons and do not function as donors during hydrogen bonding.
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If 9 serial dilutions are performed, each with a dilution of 0.1, what is the cumulative dilution?
Based on the number of serial dilutions and the dilution factor, the cumulative dilution is 1.0 × 10⁻⁹
What is serial dilution?Serial dilution is a dilution process in which successive repetitive dilutions are done of a substance in a solution using a constant dilution factor.
A dilution factor is the ratio in which the solution to be diluted and the diluent are combined.
Given that the 9 serial dilutions are performed, each with a dilution of 0.1, the cumulative dilution will be obtained as follows:
Cumulative dilution = 1 * 01 × 0.1 × 0.1 × 0.1 × 0.1 × 0.1 × 0.1 × 0.1 × 0.1 × 0.1
Cumulative dilution = 1.0 × 10⁻⁹
In conclusion, the cumulative dilution is obtained from the number of serial dilutions and the dilution factor.
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allows oxidation of co (carbon monoxide) to less-harmful co₂ (carbon dioxide) allows oxidation of hc (unburned hydrocarbons) to co₂ (carbon dioxide) and h₂o (water)
The oxidation of co (carbon monoxide) to less-harmful co₂ (carbon dioxide) and the oxidation of hc (unburned hydrocarbons) to co₂ (carbon dioxide) and h₂o (water).
What is oxidation?
One or more electrons are lost during the chemical reaction of oxidation, which takes place inside of an atom or molecule.
TWO-WAY CATALYTIC CONVERTERS
enables the conversion of carbon monoxide (CO) to the less hazardous gas CO2 (carbon dioxide)enables the conversion of unburned hydrocarbons (HC) to CO2 and H2O (water)This structure allows the chemical reaction to happen by directing exhaust fumes to travel through the substrate that is made of the precious metals platinum and palladium. As the conversion process proceeds, the temperature of the exhaust gases rises.
This process generates a great deal of heat, hence the exhaust gases that exit the converter should be hotter than the gases that enter it. This also explains why most units need to have heat shields.
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among the elements of the main group, the general trend in the first ionization energy moving across a period is not followed between group 2 and group 13. which best explains these exceptions?
Due to the full s orbital's protection of the electron entering the p orbital, the ionization energy drops.
The full s orbital shields the electron as it enters the p orbital, lowering the ionization energy.
This process of "shielding" reduce s the net force acting on the outer shell electrons by a large amount when each new electron experiences both nucleon attraction and S orbital repulsion forces. Ionization energy consequently drops during these groupings.
The energy needed to free the outermost, or least bound, electron from an element's neutral atom is known as the first ionisation energy. First ionisation energy normally rises from left to right across a period on the periodic table. The outermost electron is more tightly connected to the nucleus as a result of the increased nuclear charge.
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draw the structure of the major product formed in the given reaction when the aromatic aldehyde is present in excess. an aldehyde and ester react with methoxide in methanol. the aldehyde consists of two fused benzene rings. if the top fused carbon is arbitrarily numbered 1 and the ring numbered clockwise, there is an aldehyde substituent on carbon 3 and a methoxy substituent on carbon 8. the ester is a carbonyl bonded to methyl and methoxy.
When combined with methyl acetate, the chemical 6-methoxy-2 naphthaldehyde undergoes an aldol addition reaction to produce methyl 3-hydroxy-3-(6-methoxynaphthalen-2-yl)propanoate. The aldol addition product undergoes dehydration to create the aldol condensed product, (E)-methyl 3-(6-methoxynaphthalen-2-yl)acrylate.
What is aldol condensation reaction?
In an aldol condensation, an enolate ion combines with a carbonyl molecule in the presence of an acid/base catalyst to produce either a hydroxylated aldehyde or ketone, which is then dehydrated to produce a conjugated enone. It is an effective process for creating carbon-carbon bonds.
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In order to obtain funding for their research, scientists write
describing the proposed research and its costs.
a hypotheses
b research papers
C grant proposals
d email
Coenzymes such as ___________ are used to carry electrons to and from many kinds of oxidation/reduction reactions.
Coenzymes such as NADH and FADH2 are used to carry electrons to and from many kinds of oxidation/reduction reactions.
What are coenzymes?
A macromolecule that catalyses a chemical process is an enzyme. In other words, it creates the possibility of a negative reaction. Smaller molecules are used to construct enzymes to create an active component. The coenzyme is one of an enzyme's most crucial components.
Small molecules make up coenzymes. They are unable to catalyse reactions on their own, but they can assist enzymes in doing so. Coenzymes are organic nonprotein molecules that join with the protein molecule (apoenzyme) to create the active enzyme, according to the technical definition (holoenzyme).
In biological oxidation-reduction reactions, NADH and FADH2 are two coenzymes that are extremely important. Along with the transfer of electrons, hydrogen ions also occur.
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design an experiment discussing how you will determine what your unknown sample is using a flame test.
The flame test is used to visually determine identity of an unknown metal or metalloid ion based on characteristic color the salt turns the flame of a Bunsen burner. The heat of flame excites the electrons of the metals ions, causing them to emit visible light. Every element has a signature emission spectrum that can be used to differentiate the between one element and another.
How to Do Flame Test?First, you need clean wire loop. Platinum or nickel-chromium loops are the most common. They may be cleaned by dipping in the hydrochloric or nitric acid, followed by rinsing with distilled or deionized water. Test cleanliness of the loop by inserting it into a gas flame. If a burst of color is produced, loop is not sufficiently clean. The loop must be cleaned between the tests.
The clean loop is dipped in either a powder or a solution of an ionic (metal) salt. The loop with sample is placed in a clear or blue part of the flame and the resulting color is observed.
Key Takeaways: Perform Flame Test:
The flame test is qualitative test in analytical chemistry used to help identify the composition of a sample.The premise is that heat gives energy to the elements and ions, causing them to emit light at a characteristic color or emission spectrum.The flame test is a quick way to narrow down identity of a sample, but must be combined with other tests to confirm composition.To know more about flame visit: brainly.com/question/6871204
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Use dimensional analysis to solve the following: 2.3 mi =
2.3 miles is equal to 12093 ft.
1 mile =5280 ft2.3 miles = 2.3 x 5280= 12144 ft
1 ft= 12 in12144 ft = 12144 x 12 = 145728 in
3 ft = 1 yd12144 ft =. (1÷3) × 12144 = 4048 yd
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This question is incomplete, above explanation might help.
_________________________ is the spontaneous decay in the structure of an atom's nucleus.
Radioactivity is the spontaneous decay in the structure of an atom's nucleus.
Is spontaneous decay possible in the nucleus of an atom?The spontaneous breakdown of an atom's nucleus by the emission of particles and/or radiation is referred to as radioactivity. Radiation is the emission of energy through space as particles or waves.Radioactive decay is a natural process in which the nuclei of unstable isotopes emit radiation as they decay to more stable nuclei. All of the decay processes happen on their own, but the rates at which different isotopes decay vary greatly.Radioactive decay in which certain unstable nuclei of heavier elements split into two nearly equal fragments (nuclei of lighter elements) and release a large amount of energy. Radioactivity, also known as radioactive decay, is a natural process. It is because radioactive elements continuously emit radiation as a result of reactions occurring within them.To learn more about Radioactivity is the spontaneous decay refer to
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how many moles of na₂so₄ are in a 0.140 m aqueous solution that was prepared with 2.30 kg of water ?
The moles of na₂so₄ are in a 0.140 m aqueous solution that was prepared with 2.30 kg of water is 0.00032moles
Moles and molarity of a substanceThe formula for calculating the molarity of a substance is expressed as;
molarity = moles/Volume
Given the following parameter
Molarity = 0.140M
volume = mass/density
Volume = 2.30/997 kg/m³
Volume = 0.0023m³
Determine the required moles
Moles of na₂so₄ = molarity * volume
moles of na₂so₄ = 0.140 * 0.0023
moles of na₂so₄ = 0.00032moles
Hence the moles of na₂so₄ are in a 0.140 m aqueous solution that was prepared with 2.30 kg of water is 0.00032moles
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What do you call of force acting on the ball along the horizontal line or along the that makes the ball in motion
Tension force is the force applied on the ball in a horizontal direction or along the that makes the ball in motion
Tension force is the horizontal pulling force imposed on an object by a string, rope, or cable from the opposite end. The ball is linked to a string or rope in this scenario, which is exerting tension on the ballStretching the rope or string in an attempt to bring the ball closer to it creates tension force. The ball will have a tendency to overcome the force at this point, which is why the ball will move once the force is removed.To know more about Tension force visit : https://brainly.com/question/2287912
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n‑methyl‑2‑pyrrolidone is an aprotic solvent used in many industrial processes. draw the structure of the product formed when it is heated with aqueous acid.
We will obtain the product 4-(methylamino)butanoic acid
What is industrial process?
Heavy industry comprises a sizable portion of industrial operations. They include manufacturing-related chemical, physical, electrical, and mechanical processes. Most often, it is employed in large-scale industrial initiatives. Companies use a variety of industrial processes to create or shape a product.
The idea behind the reaction between mathrmN and N-methyl-2-pyrrolidone serves as the foundation for this issue. An chemical molecule called N-methyl-2-pyrrolidone has a lactam with five members. NMP is the abbreviation for it. It is a useful substance that is employed in the recovery of hydrocarbons produced during the manufacturing of petrochemicals.
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Explain whether the cane sugar is hydrated.
Yes, the sugarcane is hydrated.
A species of long, perennial grass called sugarcane or sugar cane is used to make sugar. The plants have strong, jointed, fibrous stalks that are 2–6 m tall and rich in sucrose, which gathers in the internodes of the stalks. Your body is hydrated by sugarcane juice, which also helps you feel less tired in hot conditions. You can combat dryness with the help of the minerals, proteins, and carbs found in this drink.
Because sugarcane is high in antioxidants, it helps the body fight illnesses and increases immunity. Due to its high iron, magnesium, calcium, and other electrolyte content, it is excellent for dehydration. As it increases the body's protein levels, it helps the body fight fever as well as the common cold and other diseases.
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yes sugarcane is hydrate to get respected products of sugarcanes like juice , raw materials etc.
sugar cane is gathered and then treated with water to create raw juice, which has a low pH and dissolved contaminants. To increase the pH and react with the contaminants to create soluble calcium organic compounds that can be removed, hydrated lime is added to the juice. Lime excess is eliminated through carbonation or phosphoric acid addition. Depending on the needed level of final product purity, this process could be done numerous times.Two independent processes are involved in the production of sugar: (a) turning sugar cane or sugar beets into raw sugar, and (b) turning the raw sugar into refined sugar. The yield of the crystalline product is decreased by the presence of polysaccharides, proteins, starches, gums, waxes, and other colloidal contaminants in cane and beet sugar extracts, which also include unacceptable levels of sucrose.therefore the cane sugar is hydrated to get the following products.
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how many protons, neutrons and electrons are there in a neutral atom of the isotope of chlorine named chlorine-35?
Taking into account the definition of mass number, atomic number and charge of an atom, the number of protons and electrons of the isotope of chlorine named chlorine-35 is 17, while the number of neutrons is 18.
Subatomic particlesAll atoms are made up of subatomic particles: protons and neutrons, which are part of their nucleus, and electrons, which revolve around them.
Atomic numberThe atomic number indicates the number of protons that are present in the nucleus of an atom.
If the atom is electrically neutral, the positive charge of the protons is balanced by the negative charge of the electrons. That is, the number of protons in the nucleus is equal to the number of electrons in its orbitals, so that in a neutral atom the atomic number also indicates the number of electrons.
Mass numberThe mass number indicates the total number of particles in the nucleus. That is, the mass number is the sum of the number of protons and the number of neutrons in the atomic nucleus.
Number of protons, neutrons and electrons in chlorine-35The atomic number of chlorine is 17, while the mass number of chlorine-35 is 35.
So, being a neutral atom, by definition of atomic number the amount of protons and electrons that the isotope of chlorine has is 17.
Finally, knowing the number of protons and the atomic mass of the isotope, the number of neutrons is calculated by:
35 =17 + number of neutrons
35 - 17 = number of neutrons
18= number of neutrons
In summary, the number of protons and electrons of the isotope of chlorine named chlorine-35 is 17, while the number of neutrons is 18.
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student proposes the following lewis structure for the nitronium ion. assign a formal charge to each atom in the student's lewis structure.
the following lewis structure for the nitronium ion. assign a formal charge to each atom in the student's lewis structure
atom formal charge N: 0
central O: +2
right O: −1
What is lewis's Structure?
A Lewis Structure or Electron Dot Structure may be a very simplified representation of the valence shell electrons in a molecule. It denotes the way the valence electrons are arranged around the individual atoms in a molecule.
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Liquid carbon disulfide reacts with oxygen gas, producing carbon dioxide gas and
sulfur dioxide gas
The periodic table is arranged by various patterns. Is there a pattern with regard to ionic charge
Ionic sizes would decrease down the group but increase across a period.
What is ionic charge?The term ionic charge refers to the charge that an ion carries. We know that metals are found towards the left hand side of the periodic table while the nonmetals are found towards the right hand side of the periodic table.
Down the group, more shells are added hence the atomic sizes would increase down the group.
As we move from left to right, the ionic sizes are increased because ions are formed by the addition of electrons to the electron cloud. Hence ionic sizes would decrease down the group but increase across a period.
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A substance that gives up a proton during a chemical reaction, raising the hydrogen ion concentration of water, is most appropriately called.
A substance that gives up a proton during a chemical reaction, raising the hydrogen ion concentration of water, is most appropriately called acid.
What is an acid?An acid is a substance that produces hydrogen ion as the only positive ion produced in water. This is the Arrhenius definition of an acid. As such, the acid gives out a proton to water and oxonium ion is formed.
Thus, substance that gives up a proton during a chemical reaction, raising the hydrogen ion concentration of water, is most appropriately called acid.
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Which bases can be used to deprotonate a terminal alkyne? choose all that apply.
NaNH₂ can be used to deprotonate a terminal alkyne.
An analogous term (pKa) can be used to describe the acidity of terminal alkynes because they are mildly (i.e. weak) acidic. In this case, too, the lower the pKa value, the stronger the acid.
Alkynes have pKa values of around 25, therefore sodium amide, or NaNH₂, is an excellent (strong, that is) base that can deprotonate them. Indeed, sodium amide does deprotonate terminal alkynes (it can be used for elimination reactions, too).
This is possible because the NH₂⁻ anion is the conjugate base of Ammonia (NH₃) and, as a general acid-base principle, the weaker the acid, the stronger its conjugate base (Conjugate acid). Since ammonia has a pKa of about 38, NH₂⁻ is indeed a very strong base.
Sodium amide can deprotonate terminal alkynes (and alcohols, too) and it is often used when an Acetylide ion (RC₂⁻) is needed. These ions are then extremely helpful intermediates in the synthesis of organic compounds because they can react in a wide range of reactions as nucleophiles.
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what is the volume of methanol in a 200. g sample if the density of methanol is 0.7918 g/ml
The volume of the methanol in the sample is 252.58 mL
What is density?The density of a substance is simply defined as the mass of the subtance per unit volume of the substance. Mathematically, it can be expressed as
Density = mass / volume
With the above formula, we can obtain the volume of the methanol. Details below
How to determine the volume of the methanolThe following data were obtained from the question;
Mass of methanol = 200 gDensity of methanol = 0.7918 g/mLVolume of methaonl =?Density = mass / volume
Thus,
Volume = mass / density
Volume of methaonl = 200 / 0.7918
Volume of methaonl = 252.58 mL
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A 5.00 l container is filled with 0.300 atm acetylene and 0.800 atm hydrogen, which react according to:____.
A 5.00 l container is filled with 0.300 atm acetylene and 0.800 atm hydrogen, which react according to: C2H2(g) + 2 H2(g) C2H6
what is a reaction?
A chemical reaction occurs when two or more molecules collide with the right orientation and enough force to produce a new product. Atomic bonds are created and disrupted throughout this process. Products, as opposed to reactants, are the compounds that result from an interaction between two other substances.
Substances are made up of chemical components or chemical elements. The atoms that make up the reactants in a chemical reaction are rearranged to create different products. A essential aspect of life itself, as well as technology and civilization, are chemical reactions.
0.300 atm acetylene and 0.800 atm hydrogen are placed in a 5.00 l container, where they react as follows: C2H2(g) + 2 H2(g) C2H6.
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Why do some glucose molecules move out of
the blood and others move into it?
Due to process of facilitated diffusion some glucose molecules move out of the blood and others move into it.
Facilitated diffusion :The diffusion of solutes across the plasma membrane is facilitated by transport proteins. Passive transport is facilitated diffusion. Even though transport proteins are involved in facilitated diffusion, it is still passive transport because the solute is moving across the concentration gradient.
Why is it called facilitated diffusion?Passive transportation is facilitated transport. Unlike simple diffusion, which occurs when materials pass through a membrane without the assistance of proteins, facilitated transport, also known as facilitated diffusion, occurs when materials diffuse across the plasma membrane with the assistance of membrane proteins.
Importance of Facilitated DiffusionTo move molecules from one side of the membrane to the other without using energy, facilitated diffusion is required. Large and charged molecules, in particular, benefit from facilitated diffusion. These molecules cannot move freely across the plasma membrane due to simple diffusion.
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The procedure warns against adding more than 15 ml of xylene to the erlenmeyer flask during recrystallization. why?
This could lead to some product not dissolving fully and thus remaining in solution after the recrystallization flask has cooled.
What is recrystallization?
Recrystallization is defined as a method for the purification of compounds that involves dissolving a compound in a solvent and then gently cooling the solution to form crystals, which are a purer form of the component. Recrystallization is a technique used by scientists to clean up solids, which are usually byproducts of various chemical reactions.
Therefore,
The procedure warns against adding more than 15 ml of xylene to the erlenmeyer flask during recrystallization. why?
This could lead to some product not dissolving fully and thus remaining in solution after the recrystallization flask has cooled.
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Which of the following photons frequency has the highest energy?
A. 8.02 x 10^-12
B. 23 x 10^-13
C. 20 x 10^13
D. 25 x 10^12
Explanation too please
Answer: 23 x 10^-13
Explanation:
In exponential smoothing, the closer alpha is to ________, the greater the reaction to the most recent demand.
In the exponential smoothing, the closer alpha is to 1, the greater the reaction to the most recent demand.
What is exponential smoothing?Exponential smoothing is a way to smooth out data for the presentations or to make forecasts. It’s usually used for the finance and economics. If you have a time series with a clear pattern, you could use moving averages — but if you don’t have a clear pattern you can use the exponential smoothing to forecast.
Damping Factors
Perhaps one of the most confusing aspects of the exponential smoothing is the damping factor. Damping factors are used to smooth out graph and take on a value between 0 and 1. Technically, damping factor is 1 minus the alpha level (1 – α). But all you really need to know is the smaller alpha levels (i.e. larger damping factors), smooths out peaks and valleys more than larger alpha levels (smaller damping factors). Smaller damping factors also mean that your smoothed values are closer to actual data points than larger damping factors.
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Answer:
This isn't an actual question?
Explanation:
Why is carbon-14 radioactive, while carbon-12 is not? Be sure to use the terms protons and neutrons in your answer for full credit.
this will be copied and pasted fyi
Carbon-12 and carbon-14 are two isotopes of the element carbon. The difference between carbon-12 and carbon-14 is the number of neutrons in each of their atoms, this is why one of them is radioactive and the other isnt
(Not sure)
Answer:
Carbon-12 is stable, meaning it never undergoes. radioactive decay. Carbon-14 is unstable and undergoes radioactive decay with a half-life of about 5,730 years (meaning that half of the material will be gone after 5,730 years)