On calculating using conversions, John can select either the package of wood with (a) 3 pieces of 2000mm each or the one with (d) 6 pieces of 100cm each.
On conversion of units from mm and cm to m:
1m = 100cm
1m = 1000mm
Therefore,
Since John requires 6m of wood to build a diving board, using unit conversions:
3 pieces of 2000mm each:
2000mm = 2m = 2m x 3 = 6m
4 pieces of 1.5 cm each:
1.5cm = 0.015m x 4 = 0.06m
6 pieces of 100 mm each:
100mm = 0.1m x 6 = 0.6m
6 pieces of 100 cm each:
100cm = 1m x 6 = 6m
8 pieces of 200 mm each:
200mm = 0.2m x 8 = 1.6m
Result:
The package with 3 pieces wood of 2000mm each equals to 6m of wood.
Similarly, the package with 6 pieces wood of 100cm each equals to 6m of wood.
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What type of functional groups or atoms would need to be present in the r groups for hydrogen?
Alcohols (O-H), acids (COOH), or amines (NH2)-polar groups are need to be present in the R group for hydrogen.
This type of functional group contains only hydrogen and carbon as constituent elements. They are commonly represented with ‘R’. They are also called hydrocarbyl groups. The bonding between the carbon atoms can be single, double, or triple.
When we define a functional group, we imply a group of atoms of the same or different elements forming a chemically-active section of a compound and creating a class of new compounds. In organic chemistry, there are many such functional groups. For example, an alcohol group (-OH) defines a particular set of characteristics of the compounds that have it as a constituent. These characteristics will vary from one functional group to the other.
Therefore,
Three function groups Alcohols (O-H), acids (COOH), or amines (NH2) needs to be present in the R group for hydrogen.
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A chemist is designing an experiment to investigate the effect of temperature on the rate of a chemical change. Suggest a suitable hypothesis for the experiment. Also, list the dependent, independent, and controlled variables that can exist in such an investigation.
A suitable hypothesis for the above experiment conducted by the chemist is as follows: IF the temperature is increased, THEN the rate of chemical change will also increase.
Independent variable - TemperatureDependent variable - Rate of chemical changeWhat is an experiment?Experiment is a test under controlled conditions made to either demonstrate a known truth, examine the validity of a hypothesis, or determine the efficacy of something previously untried.
A hypothesis is an educated guess or a tentative conjecture explaining an observation or scientific problem.
According to this question, a chemist is designing an experiment to investigate the effect of temperature on the rate of a chemical change.
This suggests that a suitable hypothesis for the above experiment conducted by the chemist is as follows: IF the temperature is increased, THEN the rate of chemical change will also increase.
Also, the Independent variable is the temperature because it is the variable that is changed.
Dependent variable is the rate of chemical change because it is the measured variable.
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Answer:
A suitable hypothesis for the above experiment conducted by the chemist is as follows: IF the temperature is increased, THEN the rate of chemical change will also increase.
Independent variable - Temperature
Dependent variable - Rate of chemical change
controlled variable - pressure or concentration of the reactants
What would this frequency become if the person's breathing passage were filled with helium instead of air? assume the same temperature dependence for helium as for air.
1.07×10³Hz frequency become if the person's breathing passage were filled with helium instead of air
Here, air temp is taken as 37.0°C if the person's breathing passage were filled with helium instead of air then we find out velocity of sound in the helium. here velocity of sound in the helium for 0°C is 965m/s
formula for velocity of sound in the helium :
Vw he=Vw at 0°C×√T/273
Whereas Vw he=965×√273+37/273
Vw he=1028m/s
Here we find frequency so fundamental freq=fundamental harmonic no 1(velocity/4(length of tube)
=1(1028/4×0.24)
f=1.07×10³Hz
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How many molecules of co2 are there in a sample of dry ice (solid co2) with a mass of 10.8 g?
Carbon dioxide may be found in solid form as dry ice.
What is Dry ice ?Carbon dioxide may be found in solid form as dry ice. CO2 is widely used for temporary cooling since it does not have a liquid state at normal atmospheric pressure and instead sublimates immediately from the solid state to the gas state.
Dry ice is used as a refrigerant, particularly when shipping perishable goods like meats or ice cream, as it sublimes (passes straight into the vapour without melting) around 78.5 °C (109.3 °F).
Dry ice is carbon dioxide in its solid form.
Mass of CO2 = 10.8g
Molar mass of CO2 = 44g/mol
molecules of CO2 = 10.8g * 1 mol/44g= 0.245 mol * 6.022 * 10²³ molecules/1 mol= 1.48 * 10 ²³molecules.
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The number of molecules is 1.48 × 10 ²³molecules
Elaborate:
Mass of CO₂ = 10.8 g
Molar mass of CO₂ = 44 g/mol
molecules of CO₂ = 10.8 g × 1 mol/ 44 g= 0.245 mol × 6.022 × 10²³ molecules/1 mol= 1.48 × 10 ²³molecules
What is solid ?
Carbon dioxide may be found in solid form as dry ice. CO₂ is widely used for temporary cooling since it doesn't have a liquid state at normal atmospheric pressure and instead sublimates immediately from the solid state to the gas state.
Dry ice is used as a refrigerant, particularly when shipping perishable goods like meats or frozen dessert , because it sublimes (passes straight into the vapour without melting) around 78.5 °C (109.3 °F).
solid is carbon dioxide in its solid form.
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In the experiments conducted by avery, mccarty, and macleod, which hypothetical result would indicate that protein, not nucleic acid, was griffith's transforming substance?
The hypothetical result that would indicate Griffith's transforming substance is only the extracts from heat-killed cells treated with RNAS are unable to transform nonvirulent bacteria into virulent bacteria.
What is an experiment?An experiment is a scientific experiment that is conducted by scientists to prove a hypothesis.
In the experiments conducted by the scientists, the pure cells did not produce favorable findings, but they did exhibit transform ants that were quite similar to DNA.
Thus, the correct option is A, Only the extracts from heat-killed cells treated with RNAS are unable to transform nonvirulent bacteria into virulent bacteria.
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The question is incomplete. Your most probably complete question is given below:
Only the extracts from heat-killed cells treated with RNAS are unable to transform nonvirulent bacteria into virulent bacteria.
All the extracts from heat-killed cells are able to transform to nonvirulent bacteria.
Only the extracts from heat-killed cells treated with D.
The RNA of the bacteria used in this experiment was degraded.
What will happen to the potency of acetylcholine after replacing the acetyl group with propionyl or butyryl groups?
The potency of acetylcholine after replacing the acetyl group with propionyl or butyrly group decreases.
Its is a organic chemical that function in the brain and body fofmany types of animal ,and humans also as neurotransmitter.
It act as a messenger , that plays a very important role in the central and peripheral nervous system.
The acetylcholine is important for autonomic body functions, muscle control and memory , learning and attention.
Lack of acetycholine cause no contraction in muscles.
Excess of acetylcholine causes cramps , muscular weakness blurry vision, diarrhea etc.
Propionyl or butyryl is higher homologus group than acetyl , this is the reason the potency will decreases or reduces its activity.
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The type of synapse that occurs between the terminal end of the presynaptic cell and the dendrites of the postsynaptic cell is referred to as which kind of synapse?
Axodendritic type of synapse that occurs between the terminal end of the presynaptic cell and the dendrites of the postsynaptic cell is referred to as which kind of synapse
Synapses are part of the circuits that connect the sensory organs of the peripheral nervous system to the brain. B. People who perceive pain and touch. Synapses connect neurons in the brain to neurons in the rest of the body, and from those neurons to muscles.
A synapse is a small gap between two neurons where nerve impulses are carried by neurotransmitters from the axon of a presynaptic (transmitting) neuron to the dendrites of a postsynaptic (receiving) neuron. It is called the synaptic cleft or synaptic cleft.
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Which has the greatest number of hydrogen atoms? group of answer choices 1020 hydrogen atoms 100 g of a substance that is 2% h by mass 100 g of water 20 g of hydrogen gas
20gm of hydrogen will have highest number of hydrogen atoms.
We know that 1 mole of substance contains atoms equal to Avogadro number i.e. [tex]6.022*10^{23}[/tex]
As molar mass of hydrogen is 1gm there 1 mole of hydrogen contains 1gm of hydrogen and [tex]6.022*10^{23}[/tex] hydrogen atoms
If we take 1020 hydrogen atoms then it is very less than [tex]6.022*10^{23}[/tex] hydrogen atoms.
In 100gm of substance if hydrogen is 2% by mass i.e. we have 2gm of hydrogen atom which means 2 mole of hydrogen atoms
Mass of 1 mole of water is 18gm
Thus 100 gm of water have 5.55 moles of water
In 1 mole of water we have 2 grams of hydrogen
Therefore 5.55 moles of water contains 11.11gm of water i.e. 11.11 mole of water
11.11gm of water = [tex]11.11* 6.022 * 10^{23}[/tex] atoms
In 20gm of hydrogen we have 20 mole of hydrogen
i.e. [tex]20* 6.022 * 10^{23}[/tex]
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3-hydroxybutanal can exist in equilibrium as a cyclic hemiacetal.true /false
It is false that 3-hydroxybutanal can exist in equilibrium as a cyclic hemiacetal.
Hemiacetal is produced when one molecule of aldehyde and one molecule of alcohol react.
3-hydroxybutanal (see the structure in the picture below) has both carbonyl and hydroxyl group, so it can, theoretically, undergo an intramolecular reaction to form a cyclic hemiacetal in aquatic solution.
Stability of cyclic hemiacetals depends on the size of the ring. Five or six membered rings are generally favored.
If 3-hydroxybutanal form a cyclic hemiacetal, it will have four membered ring, so it will be very unstable. It cannot exist in aquatic solution, while 4-hydroxybutanal can (see the picture below).
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If a capacitor is overcharged, the electrons from the negative plate could be pulled through the insulation to the positive plate. the capacitor is said to be ? .
If a capacitor is overcharged, the electrons from the terrible plate may be pulled through the insulation to the high-quality plate. the capacitor is stated to be shorted.
Overcharging could only mean exceeding its voltage rating.The capacitor can break down (internally short between terminals) overheat and or open circuit. Some capacitors can literally ooze chemicals or “pop” or explode and/or catch fire.while you join a capacitor to DC voltage, the capacitor will price to this voltage, and the charging current will drop to zero.
You need to make certain the voltage isn't better than the capacitor’s Shorting.
On AC, the capacitor will comply with the voltage, w/a put off. again, you need to make sure the voltage rating of the capacitor fits the voltage(In this situation peak voltage).
If the voltage is higher in either case-the capacitor may short.
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true or false: sn2 mechanism for nucleophilic substitution reactions involves one step and occurs with inversion of configuration.
Sn2 mechanism for nucleophilic substitution reactions involves one step and occurs with inversion of configuration is true.
Sn2 is a single-step mechanism in which the bond is broken by the attacking nucleophile from the back of the carbon atom. Two reactants are involved in this reaction.
In this mechanism, The nucleophile approaches the substrate at 180° to the carbon leaving group. The carbon-nucleophile bond is formed and the carbon leaving group breaks.
The nucleophile can attack at the same side where the leaving group is present or the nucleophile can attack from the opposite side of the carbon atom. Since complete inversion of configuration is required, so it is compulsory for the nucleophile to attach from the opposite side.
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Calculate how much (mass) of powdered kool-aid is required to make 0.1 l of 0.2 m solution.
Mass of kool aid required is 3.42g to make 0.2 mole solution 1 liter
by the formula of molarity we know that molarity = mole/liter
We can enter those values into the equation to determine the necessary number of moles because we know that we want a 0.1Mole solution in 100 mL so by substituting the values 1/ 0.1= 0.01 moles.
We now know that there are 0.01 moles of Kool-Aid powder. Additionally, we are aware that this powder's chemical composition is c12 h22o11
By multiplying the atomic weight from the periodic table by the quantity of atoms in the compound, we may determine the molar weight of this powder. Let's calculate the powder's molar weight:
Find the carbon atomic weight
12 X 12 =144g
Then we have 22 H's, each having an atomic weight of 1.008g
22 X 11= 22g
And finally there are 11 O's, each with an atomic weight of 16g
16 X11 =176g
by adding the atomic weight of atoms 342.19g
now by finding the grams of kool compound 342.19 X 0.01mol = 3.42g.
now we know that we need 0.01 moles of the powder, and we need 3.42g of the powder to make the desired solution
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How many ions of Na+ and C1- will be present in 30g of NaCl?
Ans fast plis
3.08*10^23 ions of Na+ and Cl- will be present in 30g of NaCl.
Weight of NaCl is equal to sum of weight of one mole of sodium and one mole of chloride.
Mathematically, it can be represented as -
1 mol (Na) + 1 mol (Cl)
= 23.0+ 35.5
= 58.5 g/mol
In 58.5 gram of NaCl, there is one mole of Na or 6.02*10^23 ions
In one gram of NaCl, there will be
=6.02*10^23/58.5 sodium ions
In 30 grams of NaCl, the number of sodium ions will be -
(6.02*10^23*30)/ 58.5
=3.08*10^23 ions
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How many h atoms are in 259 g of c12h21o9? molar mass of c12h21o9 = 309.29 g/mol
Number if atoms in 259 g of [tex]C_12H_2_1O_9[/tex] is [tex]5.04*10^{23}[/tex]
We know that according to Avogadro's law , number of atoms in one mole of molecule is [tex]6.022*10^{23}[/tex] .
In given question we have to find number of atoms in 259 g of [tex]C_12H_2_1O_9[/tex]
The molar mass of [tex]C_12H_2_1O_9[/tex] is given that is [tex]309.29 g/mol[/tex]
Therefore total number of moles = [tex]given mass / molar mass[/tex]
Number of moles = [tex]259/309.29[/tex]
=[tex]0.8374[/tex]
Thus, number of atoms in 0.8374 mole of [tex]C_12H_2_1O_9[/tex] is given by
= [tex]0.8374 * 6.022 * 10^{23}[/tex]
= [tex]5.04*10^{23}[/tex]
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What mass of agcl will precipitate when 10.0 g of nacl is added to an aqueous solution of agno3?
When 10.0 g of NaCl is added to an aqueous solution of AgNO₃, 24.5 g AgCl will be precipitated.
The balanced chemical reaction is:
NaCl(aq) + AgNO₃(aq) → AgCl(s) + NaNO₃(aq)
Molar mass of NaCl = 58.5 g
Molar mass of AgCl = 143.5 g
Number of moles of NaCl = Given Mass
Molecular Mass
= 10.0 g ÷ 58.44 g/mol
= 0.171 moles
From the reaction,
58.5 g of NaCl produces 143.5 g of AgCl
10.0 g of NaCl will produce 143.5 × 10.0 = 24.5 g AgCl
58.5
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Lauren walks 90 m in half a minute. What must her speed have been to travel this
distance?
90.5 m/min
0.006 m/min
45 m/min
O 180 m/min
Clear selection
What information does a topographical map primarily provide?
Answer:
A detailed map which shows every feature of the earth accurately including roads, airports, names of places etc is called a topographical map
Explanation:
6. You are asked to calculate the density of an unknown metal block. The mass of the block was measured to be 83.0 g. When the block was placed in a graduated cylinder containing water, the volume of the block was measured as 17.2 mL. Calculate the density of this unknown metal.
Density of the unknown metal is 4.82 g/mL
A substance's density is defined as its mass per unit of volume. Density is most frequently represented by the symbol ρ.The volume and mass of the substance must be known in order to compute density.Given,
mass of block is 83 g
When the block was placed in a graduated cylinder containing water, the volume of the block was 17.2 mL.
we have to find density with the help of these two terms,
As we know,
Density = Mass/volume
therefore,
Density = 83 / 17.2
= 4.82 g/mL
thus, density of unknown metal block is 4.82g/mL
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A 20.00 g mixture of magnesium and zinc metal reacting with excess hydrochloric acid produced 1.152 g of hydrogen gas. what is the percent zinc in the original mixture?
percentage of zinc= 5.985/20 X 100= 29.5%
let x represents zinc and y be magnesium so
Zinc(s) + 2HCl(aq) -----> ZnCl2(aq) + H2(g)
Mg(s) + 2HCl(aq) -----> MgCl2(aq) + H2(g)
1.152 g of hydrogen gas=( x/65.3 + y/24.305) 20
= 3.08 x10^-2 + 0.8295-8.30
=x=5.985
y= 4.015
percentage of zinc= 5.985/20 X 100= 29.5%
The hydrogen gas escapes, so the two products of Zinc Chloride and Magnesium Chloride will then react with Silver Nitrate. Again, I combine both of the reactions
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Hydrogen sulfide gas is reacted with dioxygen gas to produce gaseous sulfur dioxide and water. True or false?.
Hydrogen sulfide gas is reacted with dioxygen gas to produce gaseous sulfur dioxide and water. It is false.
When hydrogen sulfide gas reacts with dioxygen gas, it produces water and solid Sulphur and not gaseous sulfur. The chemical equation of the given substances is :
2H2S + O2 → 2S + 2H20
It is a redox reaction as both Oxidation and reduction happens in it. Oxidation of hydrogen sulphur to sulphur happens and reductions of oxygen to water takes place.
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What multiplicity would you expect in a 1h nmr spectrum for the indicated proton(s)? (1 pts)
Triplet multiplicity would expect in a 1h NMR spectrum for the indicated proton(s).
The spectrum is the invisible radio frequencies that radio signals pass through. These signals let you make phone calls from your mobile device, tag your friends on call an Uber, and get directions to your destination, all from your mobile device.
Spectrum management is the art and science of managing the use of the radio spectrum to minimize interference and ensure that the radio spectrum is used in the most efficient manner possible for the public good. For USDOT, this focuses on supporting safe, efficient, and economical transportation. Spectrum Networks is a suite of news and sports networks owned and operated by Charter Communications, Inc.
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When an acid is dissolved in water, how does it change the solution's ph?
When an acid is dissolved in water, by releasing protons into the solution, it lowers the pH.
What is pH?
The letters pH stand for the potential of hydrogen since pH is essentially a measurement of the number of hydrogen ions (i.e. protons) in a substance. The pH scale was created in 1923 by scientist Peter Lauritz Srensen. (1868-1969).
The pH of a solution is a key marker of its chemical makeup. The pH can have an impact on the biological processes that take place, the behavior of bacteria, and the behavior of chemicals.
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What will be the coordinates of B' if the triangle below is reflected across the y-axis? Pre-image Points: A(1.-4) B(2, -1) C(6,-4) A.(-1,2) B.(1,-2) C.(-2,-1) D.(2,1)
The coordinates of B' is (2,1) if the triangle below is reflected across the y-axis .
Hence , option D is correct one .
A reflection is a transformation of the graph of a function over x - axis or the y - axis ( or both ) . The x-coordinate of each point must be negated while reflecting across the Y- axis, but the value must remain unchanged .
Each point in a figure is transformed into a reflection by reflecting it over a line. This reflection translates the ABC triangle (A, B, and C) . The outcome is a brand-new figure known as the picture .
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Identify some materials that possess a non crystalline structure?3.1 what is the dilemma between design and manufacturing in terms of mechanical properties?
1) Many important materials are noncrystalline, such as liquids and gases. Water and air have noncrystalline structures. When a metal is melted, its crystalline structure is lost.
2) Mechanical properties such as high strength are desirable for design, but they make manufacturing more difficult. As a result, design properties disadvantage manufacturing properties and vice versa.
Give examples of non-crystalline solids.Non-crystalline solids, on the other hand, allow particles to move more freely because they are not as rigidly arranged as other solids. These solids form when a liquid is suddenly cooled. Plastic and glass are two of the most common examples.
Why are crystalline solids referred to as pseudo solids?As a result, they are referred to as "pseudo solids." Crystalline solids have less energy than non-crystalline solids. Solids are classified into two types: crystalline solids and non-crystalline solids.
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2. Which of the following is determined by distance divided by time with direction?
a Acceleration
b Velocity
C speed
Calculate the ratio (lb-mole o2 react/lb-mole no formed). if ammonia is fed to a continuous reactor at a rate of 100.0 kmol nh3/h, what oxygen feed rate (kmol/h) would correspond to 40.0xcess o2?
if ammonia is fed to a continuous reactor at a rate of 100.0 kmol nh3/h
175 Kmol/h is oxygen the fed rate that corresponds to 40% excess O₂.
Given chemical reaction is
4NH₃ + 5O₂ → 4NO + 6H₂O
The molecular weight of NH₃ is 17.03, O₂ is 32, NO is 30, and, H₂O is 18.
To find the ratio,
Ratio = lb-mole O₂ react / lb-mole NO formed
Or, ratio = 5/4
Or, ratio = 1.25
NH₃ fed rate = 100 Kmol/h
We have to find out whether the Oxygen fed rate corresponds to 40% excess O₂.
For each 4 Kmol of NH₃, 5 Kmol of O₂ is required.
4 Kmol of NH₃ ≡ 5 Kmol of O₂
100 Kmol of NH₃ ≡ 125 Kmol of O₂
So, 125 Kmol of O₂ is required for 100 Kmol of NH₃.
For 40% excess of O₂, the required Kmol is = 125 + 125 × 40%
The required Kmol of oxygen is 175 Kmol/h for excess of O₂.
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Give an example of a pair of isotopes of the same element. Explain how they are similar and how they are different.
Please help, no bots!
An example of a pair of isotopes of the same element is Hydrogen and Deuterium. They are similar because they have same atomic number and they are different because they have different mass number.
What is Hydrogen ?Hydrogen is a chemical element with the atomic number 1. It is represented with symbol H. Mass number of hydrogen is 1. Hydrogen belong to group 1. It belongs to period 1. Hydrogen is s-block element.
What is Deuterium ?Deuterium is isotope of hydrogen. The atomic of deuterium is 1. The mass number of deuterium is 2. It is also known as heavy hydrogen. It is represented as D or 2H.
Thus from the above conclusion we can say that a pair of isotopes of the same element is Hydrogen and Deuterium.
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U-235, the isotope of uranium commonly utilized in nuclear power plants, is _____.
U-235 is utilized for fuel for nuclear power plants and the nuclear reactors that run naval ships and submarines
U-238 makes up 99.27% of natural uranium, together with 0.72% of U-235 and 0.005% of U-234. U-235 is the most often used isotope of natural uranium in nuclear power plants, but because it only makes up 0.72% of natural uranium, it must be enriched in order to be used as fuel in these facilities. The U-238 uranium isotope is the most prevalent and the heaviest of the three naturally occurring uranium isotopes. The uranium fuel is put together in a nuclear reactor so that a regulated fission chain reaction may occur. By splitting the U-235 atoms, heat is produced. This heat is then utilized to create steam, which spins a turbine and powers an electricity-generating generator.
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A p orbital has _____ regions or lobes of high electron probability, on either side of the nucleus. this gives the orbital a(n) _____ shape.
A p orbital has two regions or lobes of high electron probability, on either side of the nucleus. This gives the orbital dum-bb-ell shape.
The p - orbital is the atomic orbital consist of two sections called lobes on either side of plane passing trough nucleus and the shape of p - orbital appears as dum-bb-ell.
The region around the nucleus is where the probability of electron finding is high and called as orbital. The p orbital lobed region is where their is high probability of finding an electron. The probability of finding electron in the nucleus is very low .
Hence, A p orbital has two regions or lobes of high electron probability, on either side of the nucleus. This gives the orbital dum-bb-ell shape.
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Where corrosion protection is necessary and the conduit is threaded in the field, the threads must be coated with a(n) ______, electrically conductive, corrosion-resistance compound.
Where corrosion protection is vital and the conduit is threaded in the field, the threads must be coated with a(n) Approved electrically conductive, corrosion-resistance compound.
What is corrosion protection?
A corrosion protection method may be a technique used to minimize corrosion such as the application of anti-corrosion coating, cathodic protection, or other methods that make metal resistant to corrosion.
Metal corrosion in most situations is usually slowed, managed, or maybe put to a stop utilizing the right techniques.
What does one mean by corrosion?
Corrosion may be a natural process which converts refined metal to their more stable oxide.It is the gradual destruction of materials {usually metals} by chemical reaction with their environment.In the most common use of the world, this suggests electrochemical oxidation of metals in reaction with an oxidant such as oxygen.
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