Answer:
This isn't an actual question?
Explanation:
Write a function swap that swaps the first and last elements of a list argument.
Swap function swaps the first and last elements of a list argument. By saving the first and last element as a pair in the tuple variable get, you can unpack those elements with the first and last member in that list. The First and Last values in that list have been switched around.
What is swapping of elements?
The elements will be switched, and the new list will print. This application employs the same reasoning as two-number swapping in Python or any other language by swap function. Assign the first element value to the final element, create a temporary variable to keep the last value, and then assign the temporary element value to the first element. Unpack those elements with the first and final element in that list by storing the first and last element as a pair in the tuple variable get. In that list, the First and Last values are now reversed.
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Calculate the wavelength of light emitted when an electron in the hydrogen atom makes a transition from an orbital with n = 6 to an orbital with n = 2.
The wavelength of light emitted when an electron in the hydrogen atom makes a transition is 410 nm.
ni = 6; the initial energy level
nf = 2; the final energy level
An electron in the hydrogen atom jump from higher (ni=6) to lower energy (nf=2) level by emitting light of specific wavelenght.
1/λ = R(1/nf² - 1/ni²); the Rydberg formula for the wavelenght
R is Rydberg constant
1/λ = 10 973 731.6 m⁻¹ × (1/2² -1/6²)
1/λ = 10 973 731.6 m⁻¹ × 0.222
1/λ = 2438607.022 m⁻¹
λ = 1 / 2438607.022 m⁻¹
λ = 410×10⁻⁹ m
λ = 410 nm; the wavelength of light emitted
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Which compound will elute last from a silica filled column: 4-hydroxynitrobenzene or 2-hydroxynitrobenzene? why
4-hydroxynitrobenzene will elute last from the silica filled column.
A scientific method for dissolving a mixture into its constituent parts is chromatography.the chromatographic procedure of removing an adsorbate from a solid adsorbing media called elute using a solvent. separating an antibody from the antigen it is bound to.In reverse phase liquid chromatography, stationary phase is non-polar in nature and becomes more non-polar as the number of carbon chains grows.The order of elution from a column usually follows the series: alkyl halides < saturated hydrocarbons < unsaturated hydrocarbons < ethers < esters < ketones < amines < alcohols < phenols < acidsare typically eluted from columns in the following order. Salts and polymeric substances frequently do not elute. Solvents: For adsorbent sites, the solvent will compete with the sample.The more polar the solute, the more readily it will dissolve in the stationary phase, remain in the column, and finally elute last. Therefore, in normal phase chromatography, the non-polar component will elute earlier than the polar component between the polar and non-polar components.4-hydroxynitrobenzene is more polar than 2-hydroxynitrobenzene therefore it will elute last.
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Choose the hypothesis for the controlled experiment that answers the question: “How does temperature affect the color of leaves on a tree?”
Cooler temperatures cause leaves to change color faster.
Deciduous leaves change color, while coniferous leaves don’t.
Warmer temperatures in the fall makes leaves produce chlorophyll.
Leaves are green because of the compound chlorophyll.
The correct hypothesis is that: Cooler temperatures cause leaves to change color faster; option A
What is a hypothesis?A hypothesis is a statement put forward to explain an observation without having done prior experiments to confirm or disprove the statement.
A controlled experiment is an experiment in which no changes are introduced by the researcher on the variables of the experiment.
Considering a controlled experiment that answers the question: “How does temperature affect the color of leaves on a tree?”
The hypothesis will be that either temperature affects the color of leaves on the tree or that temperature has no effect on the color of the leaves on the tree.
In conclusion, a hypothesis tries to explain an observation.
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Which of the following occur during mitosis? Check all that apply. Cell function slows down. The cell divides. Chromosomes divide into two groups. 0 DNA replicates. 0 Proteins are synthesized. DONE
The cell divides, the chromosomes separate into two groups, and DNA replicates are the assertions that take place during mitosis. The correct options are A, B, C, and D.
What is mitosis?In the cell division process known as mitosis, a single cell is split into two identical cells. This occurs when a cell known as the mother cell divides into a cell known as the daughter cell.
Thus, the correct options are:
A. Cell function slows down
B. The cell divides.
C. Chromosomes divide into two groups.
D. DNA replicates.
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Answer:
the correct answer is A B C
Explanation:
have a nice day.
What is the major organic product obtained from the following reaction? os04 nahso4
What is the major organic product obtained from the following reaction? os04 nahso4
OH OH are the two major organic product obtained from the following reaction.
What is organic product?
Produce can be referred to as organic if it was grown on soil without any prohibited substances applied for three years prior to harvest, according to certification. Organic foods include fresh vegetables, meats, and dairy products as well as processed goods like crackers, beverages, and frozen dinners.
Therefore,
OH OH are the two major organic product obtained from the following reaction.
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when using the liquid-based method for the collection of a specimen for a pap test, which of the following is used?
When using the liquid-based method for the collection of a specimen for a pap test, plastic fronded broom is used
What is checked in a Pap test?The Pap test (or Pap smear) looks for pre cancers, cell changes on the cervix which may become cervical cancer if they are not treated appropriately. The HPV test looks for the virus (human papillomavirus) which will cause these cell changes.
What happens if a Pap test is positive?If the results of your Pap test come back positive, meaning your doctor found abnormal or unusual cells on your cervix. It doesn't suggest you have cervical cancer. most frequently , the abnormal test result means there are cell changes caused by the human papilloma virus (HPV).
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Write the balanced formula and net ionic equation for the reaction that occurs when the contents of the two beakers are added together . what colors represent the spectator in each reaction?
[tex]AgNo_{3} (aq)+LiCl(aq)--- > AgCl(s)+LiNO_{3}(aq)[/tex]
Adenosine triphosphate (TP-ATP) ATP is the substance needed for cells to function. b. It is a molecule of energy. It supplies energy for all biological (cellular) processes. Without ATP, tissues, organs, and eventually, the entire organism perish. c. To create ATP, glucose is broken down by several complex chemical reactions (usually). Larger Organic Compounds Being Produced 1. Reactions in Synthesis or Dehydration (dehydration synthesis) When synthesizing substantial organic compounds (discussed later). A dehydration reaction takes place and is known as such.
Net Ionic chemicals do not all dissolve in water.
What mix of ions will dissolve is determined by a list of solubility rules.
In a precipitation reaction, soluble reactants are transformed into one or more insoluble product(s). The precipitate is the term for the material. Example: When LiCl and AgNO3, both of which are soluble, are combined, the result is AgCl, which is insoluble.
[tex]AgNO_{3} (aq) + LiCl(aq) -- > AgCl(s) + LiNO_{3} (aq)[/tex]
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energy is released during which phase changes? check all that apply.boilingcondensingdepositingfreezingmeltingsubliming
Energy is released during these phase changes : Freezing, Depositing and Condensing.
During phase change, the matter changes from one state to another and the energy goes exclusively to changing the phase of any substance.
During condensation, freezing, and deposition, phase changes and water releases energy so that the energy released helps the molecules of water in changing the bonding pattern of matter. this allows to transform them to a lower state of energy.
These reactions or processes are exothermic in nature.
Condensation is a process in which a gas is condensed into a liquid. During this, the quantity of energy which gets converted into heat energy from chemical energy, known as heat of condensation.
Freezing releases energy as when liquid turns into solid or water turns into ice, the water molecules moves towards each other.
Depositing is an exothermic process a it releases energy. Heat is eliminated from gas at specific point of pressure, where kinetic energy is not enough in the gas molecules to prevail over intermolecular forces.
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impedance spectroscopy and electrochemical properties of nano-crystalline vanadium pentoxide (v 2o 5) synthesized by co-precipitation method
Impedance spectroscopy and electrochemical properties of nano-crystalline Vanadium pentoxide (V₂O₅) is synthesized by co-precipitation method is an investigative experiment to analyse impedance, microstructure, electrical conductivity, and dielectric analysis.
Vanadium pentoxide is investigated widely because it is a multi functional material used for the application of different devices.
Impedance spectroscopy is a sensitive technique for characterization. This technique establishes the electrical responses of chemical systems.
In this experiment, nano-crystalline powder vanadium pentoxide (V₂O₅) was prepared by the chemical root co-precipitation method.
The increase in the dielectric constant of V₂O₅ was noted and the electrical conductivity was varying due to the variation in temperature.
The impedance was measured at the varying temperatures and varying frequency.
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How many electrons are transferred from glyceraldeyde 3 phosphate to nad in glycolysis?
Electrons transferred from Glyceraldehyde 3 phosphate to NAD in glycolysis per glucose are 4.
What are electrons?The electron is a subatomic particle (denoted by symbol e−or β−) whose electric charge is negative one elementary charge. Electrons belong to first generation of the lepton particle family, and are generally thought to be elementary particles because they have no known components or substructure. The electron's mass is approximately 1836 times smaller than that of proton.
Quantum mechanical properties of electron include an intrinsic angular momentum (spin) of a half-integer value, expressed in units of the reduced Planck constant, ħ. Being fermions, no two electrons can occupy same quantum state, in accordance with the Pauli exclusion principle. Like all elementary particles, electrons exhibit properties of both the particles and waves: They can collide with the other particles and can be diffracted like light. The wave properties of electrons are easier to observe with the experiments than those of other particles like neutrons and protons because electrons have a lower mass and hence a longer de Broglie wavelength for given energy.
Electrons play an essential role in numerous physical phenomena, such as electricity, magnetism, chemistry and thermal conductivity, and they also participate in the gravitational, electromagnetic and weak interactions. Since an electron has charge, it has a surrounding the electric field, and if that electron is moving relative to an observer, said observer will observe it to generate a magnetic field. Electromagnetic fields produced from other sources will affect the motion of an electron according to Lorentz force law.
Electrons radiate or absorb energy in form of photons when they are accelerated. Laboratory instruments are capable of trapping individual electrons as well as electron plasma by use of electromagnetic fields. Special telescopes can detect the electron plasma in outer space. Electrons are involved in many applications such as the tribology or frictional charging, electrolysis, electrochemistry, battery technologies, electronics, welding, cathode-ray tubes, photoelectricity, photovoltaic solar panels, electron microscopes, radiation therapy, lasers, gaseous ionization detectors and particle accelerators.
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ASAP!!!!!!!! test!! will give brainlist!!
Answer:
the answer to your question is D. 4.5 seconds hope this helps.
Explanation:
what are the frequency of a photon with a wavelength of 360 nm. report your answers to three significant digits.
The frequency of a photon is 8.333 x 10^14 s^-1 .
The frequency of a photon is defined as the number of waves that pass through a fixed point in a unit of time.
Formula :
f = c/ λ ---------- (1)
Where f is the frequency, c is the speed of light, and λ is the wavelength of the photon
According to question,
Given,
The wavelength of photon = 360 nm or 3.60 × 10^-7
3 x 10^8 m/s is the speed of light.
We have to find the frequency of a given photon.
Using eq. (1),
f = 3 × 10^8/ 3.60 × 10^-7
f = 0.8333 × 10^15 s^-1
Or we can also write that,
f= 8.333 x 10^14 s^-1
Hence, the frequency of the photon is 8.333 × 10^14 s^-1.
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why does venus have the largest gravitational attraction of the inner planets?
Venus is the second planet from the Sun and is named after the Roman goddess of love and beauty.
Why does Venus have the largest gravitational attraction of the inner planets?Venus has much lower mass as compared to other planets. The distance between the Earth and Venus is much shorter as compared to the distance between Earth and Jupiter. Similarly, the gravitational force of each of these planets on objects on the surface of Earth is largest for Jupiter.
The radius of Venus is 4.6023×108 km2, the mass of Venus is 4.8675×1024 kg, and has a density of 5.243 g/cm3 so that's why Venus is equivalent in size, mass and density of the Earth. So that's why the gravity on Venus is very close to that of Earth.
So we can conclude that Venus is the second planet from the Sun and is named after the Roman goddess of love and beauty.
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Explain how the compression factor varies with pressure and temperature and describe how it reveals information about the intermolecular interactions in real gases.
The compressibility factor is always greater than unity above the Boyle temperature and rises gradually but steadily with pressure.
What is Boyle temperature?A real gas begins to act like an ideal gas at a certain pressure range at a temperature, which is known as the boyle temperature. A Boyle temperature is the point at which the second coefficient of an equation reaches zero.
The temperature at which a real gas begins to behave like an ideal gas across a specific range of pressure is known as Boyle's temperature or the Boyle point. Compressibility factor Z and pressure P are represented on a graph.
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To determine the standard heat of formation for carbonic acid, h2co3, the proper chemical equation is:_________
The standard heat of formation for carbonic acid, H₂CO₃, the right chemical equation is H₂CO₃ → H₂O + CO₂ (and also H+ and CO₃— but this is irrelevant here).
Carbonic acid reaction :An important example of a reversible reaction in the human body.
This reaction occurs when CO₂ (CO₂) and water (H₂O) combine to form carbonic acid (H₂CO₃).
The newly formed acid is unstable, and it dissociates to yield both proton (H+) and bicarbonate ion (HCO₃-). The equation for the entire carbonic acid reaction is: H₂CO₃ → H₂O + CO₂
Carbonic acid (H₂CO₃) forms in small amounts when CO₂ dissolves in H₂O, yet decomposes rapidly under ambient conditions of temperature and pressure. Despite its fleeting existence, H₂CO₃ plays a crucial role in the global carbon cycle and in biological carbonate-containing systems. The short lifetime in water and presumed low concentration under all terrestrial conditions has stifled study of this fundamental species.
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The half-life of cobalt-60 is 5.3 yr. how much of a 1mg sample of cobalt -60 is left after 15.9 yr period?
The half-life of cobalt-60 is 5.3 yr. amount of a 1mg sample of cobalt -60 is left after 15.9 yr period is:
Cobalt-60 has three half-lives over a period of 15.9 years. Cobalt-60 is left behind in amounts of 0.500 mg after one half-life, 0.250 mg after two half-lives, and 0.125 mg after three half-lives.
What is half life of a reaction?
The amount of time it takes for the concentration of a given reactant to reach 50% of its initial concentration is known as the half-life of a chemical reaction.
The time required for a reactant concentration to drop to half that of its original concentration is known as the half-life of a reaction, or t 1/2. Its usage in chemistry and medicine is to forecast changes in a substance's concentration over time.
Cobalt-60 has three half-lives over a period of 15.9 years. Cobalt-60 is left behind in amounts of 0.500 mg after one half-life, 0.250 mg after two half-lives, and 0.125 mg after three half-lives.
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One student made the incomplete diagram shown below to represent the relationship between sediment, igneous rocks, and metamorphic rocks:
three ovals, labeled from left to right, metamorphic rock, sediment, and igneous rocks respectively.
Which of these is the correct next step to complete the diagram?
Put an arrow labeled heat and melt, pointing from igneous rocks to sediment.
Put an arrow labeled deposition and lithification, pointing from metamorphic rock to sediment.
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Put an arrow labeled cools and crystallizes, pointing from igneous rocks to sediments.
Put an arrow labeled heat and pressure, pointing from sediment to metamorphic rock.
Put an arrow labeled heat and pressure, pointing from sediment to metamorphic rock.
What is a rock?A rock is a solid mass that could occur either on the earth surface or in the earth's crust. There are several kinds of rocks that exist. There are the igneous rocks, the sedimentary rocks and the metamorphic rocks.
The igneous rock is the first formed rock. The sedimentary rock is formed from the remains of organisms that pile up overtime. Metamorphic rocks are formed when rocks change overtime.
The correct label that completes the diagram is;
Put an arrow labeled heat and pressure, pointing from sediment to metamorphic rock.
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describe how infrared spectroscopy could be used to determine when the addition of br2 to 1-pentene had gone to completion.
Infrared spectroscopy is the analysis of infrared light interacting with a molecule. It is widely used to detect presence of functional groups and multiple bonds in organic and inorganic molecules.
There is a characterstic region of light in the absorption spectra of each compound which serves as its fingerprint. Most functional groups show absorption bands in the region (400-1400cm^-1), so it can be used to detect their presence in the molecule.
To determine whether or not the addition reaction of Bromine (Br2) with 1-pentene has gone to completion , this technique can be used as the C-H sp2 and C=C bonds spectral bands will disappear.
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when using the liquid-based method for the collection of a specimen for a pap test, which of the following is used?
When using the liquid-based method for the collection of a specimen for a pap test, cells are suspended in a bottle of preservative by rinsing the broom in the specimen vial.
What is a pap test?
A Pap test, commonly known as a Pap smear, is a procedure a doctor uses to check for cervical cancer in female patients. Additionally, it may show alterations in your cervical cells that could later develop into cancer.
To detect alterations in cervical cells before they progress to malignancy, a pap smear is performed. The best chance of beating cancer is to discover it as soon as possible. If you don't, early detection of cell alterations can aid in preventing cancer.
Thus, by washing the broom in the specimen vial during the liquid-based method of collecting a specimen for a Pap test, cells are suspended in a bottle of preservative. Cells are immediately deposited on a microscope slide while using the direct smear method to obtain specimens for a Pap test.
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Calculate the nuclear binding energy per nucleon for tl205 which has a nuclear mass of 204.974 amu .
The nuclear binding energy per nucleon for tl205 which has a nuclear mass of 204.974 AMU is 7.68emv.
How do you compute binding energy per nucleon in MeV?If we have a nucleus with Z is for protons and N is for neutrons and mass as MA, where
A = Z+N
then its binding energy in MeV is provided by:
Eb (MeV) = ( Zmp + Nmn -MA) x 931.494 MeV/u
Operating in terms of the actual binding energy, we estimate as follows.
We get 7.68 emv.
Nuclear binding energy is described as the lowest amount of energy required to dismantle or break down an atom's nucleus into the subatomic particles that make it up (which are protons and neutrons).
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you are runnig a reaction to make a carboxylic acid, but what appears to be the product spot is too low on the tlc plate and is elongated, i.e., it isn't a nice circle but is stretched out a lot. to make this spot rounder and move a little farther, which of the following is most likely to
To make the spot more rounder, add a trace of acetic or formic acid to the eluting solvent mixture.
Thin layer chromatography:Thin layer chromatography (TLC) is a chromatographic method that uses a thin stationary phase supported by an inert backing to separate the components of a mixture. It can be carried out on an analytical scale to track the development of a reaction or on a preparative scale to purify minute quantities of a chemical.
Like all chromatography, TLC works on the principle that a chemical will have varying affinities for the mobile and stationary phases, influencing how quickly it migrates. TLC aims to produce well-defined, well-separated spots.
Streaks rather than spots are frequently produced in neutral solvents by acids, bases, and highly polar substances. Streaks can obscure other areas and make it challenging to compute a [tex]R_{f}[/tex].
Acid streaking can be corrected by adding a few percent of acetic or formic acid to the solvent. Similarly for bases, adding a little amount of triethylamine can enhance results. Adding a little amount of methanol can enhance polar substances' results.
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acids are substances that produce hydrogen ions (h ) when dissolved in water. lemon juice is an example of an acid.
The lemon juice taste like a juice sour and citrus .It is an acid and react with metal to form salt and produce hydrogen gas.
What are metals?A metals are defined as those element which has characteristic chemical and physical properties.
Lemon juice react with metal to form salt and produce hydrogen gas.
2H+ (l) + M (s) -> M2+(s) + H2(l)
Acid is a molecule or ion capable of donating a protons.
Base is a molecule or ion capable of accepting a protons.
Thus, the lemon juice taste like a juice sour and citrus .It is an acid and react with metal to form salt and produce hydrogen gas.
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Your question is incomplete, but probability your full question was
Acids are substances that produce hydrogen ions (h ) when dissolved in water. lemon juice is an example of an acid.
What does the lemon juice taste like and how it react with some metals?
both include steps involving reactions that result in the release of carbon dioxide. both include steps involving the hydrolysis of organic molecules. both sets of reactions occur within the mitochondria. both include steps involving the oxidation of organic molecules.
The common feature of both sets of reaction is represented as that both include steps involving the hydrolysis of organic molecules.
Which phases of cellular respiration release carbon dioxide (CO2)?The carbon skeleton of glucose has been broken down to CO2 with some net gain in ATP after glycolysis and the citric acid cycle, but before the electron transport chain and oxidative phosphorylation.
Where does the carbon dioxide come from?Answer and justification the citric acid cycle is the phase of cellular respiration where carbon dioxide is released. The Krebs cycle, oxidative phosphorylation, and glycolysis are the three phases of aerobic cellular respiration.
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What is the total concentration of phosphate ions (in M) in a 2. 1 M aqueous solution of magnesium phosphate?
The total concentration of phosphate ions in an aqueous solution of magnesium phosphate is 4.2 M.
The balanced chemical equation for the reaction of dissociation of magnesium phosphate in water:
Mg₃(PO₄)₂(aq) → 3Mg²⁺ (aq) + 2PO₄³⁻ (aq)
From the balanced chemical equation of dissociation of magnesium phosphate: n(Mg₃(PO₄)₂) : n(PO₄³⁻) = 1 : 2
There are two phosphate ions in one molecule of magnesium phosphate.
c(Mg₃(PO₄)₂) = 2.1 M; the concentration of magnesium phosphate
c(PO₄³⁻) = c(Mg₃(PO₄)₂) × 2
c(PO₄³⁻) = 2.1 M × 2
c(PO₄³⁻) = 4.2 M; the total concentration of phosphate ions in an aqueous solution of magnesium phosphate
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PLEASE HELP THIS IS DUE IN 5 MINUTES!! WILL GIVE BRAIN
CHECK MY ANSWERSS
1. Acrylonitrile and ethyl acetate have the same boiling point: 77.2ºC. In one to two sentences, explain what outcome you would expect if a mixture of these two substances were distilled
My answer: These two substances cannot be separated using distillation. Since both Acrylonitrile and ethyl have the same boiling point.
2. Ribbon diagrams show secondary structures and appear less detailed than other model types. In one to two sentences, give a reason that chemists would use ribbon diagrams. What type of information do they provide?
My answer:
Chemists would use ribbon diagram when wanting to study different types of proteins, this is because ribbon diagrams illustrate proteins very well.
3. In one to two sentences, explain why structural formulars are good for depicting polymers
My answer:
Structural formulas are good for depicting polymers because they are able to explain the properties and structures of the compound. Structural formulas of polymers are also able to show the arrangement of atoms that are within the power.
*Acrylonitrile and ethyl will be collected together and thus they cant be separated using distillation.
All answers seem correct to me :)
what is the hydronium ion (h3o ) concentration in milk if it has a ph of 8.2? a. 2.75 × 10–4 b. 6.31 × 10–9 c. 3.64 × 103 d. 1.58 × 108
6.31 x 10⁻⁹ mole/dm³ hydronium ion present in milk.
The hydronium ion is H₃O⁺ and its concentration is equivalent to the H⁺ ion concentration. The H⁺ ion concentration is given by:
pH = -log [H⁺]
[H⁺] = 10^(-8.2)
[H⁺] = 6.31 x 10⁻⁹ mole/dm³
(H3O+) The positive ion formed when a water molecule gains a hydrogen ion; all hydrogen ions in aqueous solution are present as hydronium ions(OH-) The negative ion formed when a water molecule loses a hydrogen ionAn aqueous solution in which the concentrations of hydrogen and hydroxide ions are equal, that is 1.0 × 10-7 mol/L; it has a pH of 7.0 is called neutral solution.To know more about pH visit : https://brainly.com/question/491373
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an analytical chemist weighs out of an unknown diprotic acid into a volumetric flask and dilutes to the mark with distilled water. he then titrates this solution with solution. when the titration reaches the equivalence point, the chemist finds he has added of solution.
In a 250 mL volumetric flask, an analytical chemist measures 0.281g of an unidentified diprotic acid and dilutes it to the proper concentration with distilled water. He follows that by titrating this solution with 0.0700M NaOH. The chemist discovers he has added 48.3 mL of NaOH solution when the titration reaches the equivalency point.
What is molar mass?
The total mass of one mole of a substance is referred to as the molar mass of a molecule. Grams per mole (g/mol) is a common unit of measurement. But kg/mol is the SI unit for this amount.
Write the neutralising reaction in step one.
Na2A + 2 H2O = H2A + 2 NaOH
Step 2: Determine the NaOH reacting moles.
0.0700 M NaOH in 48.3 mL reacts.
3.38 x 103 mol = 0.0483 L x 0.0700 mol/L
Step 3: Determine the H2A responding moles.
H2A and NaOH have a molar ratio of 1:2. The H2A reactive moles are equal to 1.69 x 3.38 x 10-3 mol.
Calculate the molar mass of H2A in step four.
The mass of 1.69 x 103 moles of H2A is 0.281 g. H2A has a molar mass of:
M is equal to 0.28 g / 1.69 103 mol, or 166 g/mol.
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consider an atom of nitrogen, with an atomic number of 7, while answering the following questions. true or false: given only the atomic number of nitrogen, it is possible to predict the number of electrons in an uncharged nitrogen atom.
Yes this statement is true
Nitrogen atom with an atomic number of 7 which means each nitrogen atom has 7 protons in an uncharged nitrogen atom number of electrons are four pair of electron are present and if only atomic number of nitrogen are given then we easily predict the number of electrons in an uncharged nitrogen atom nitrogen atom and atomic mass of nitrogen is 14 and symbol of nitrogen is N that's why this given statement is true
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If you were making a dilution of a culture and placed 1 ml of the original stock culture into a 99-ml water blank, the resulting dilution factor would be?
If you were making a dilution of a culture and placed 1 ml of the original stock culture into a 99 ml water blank, the resulting dilution factor would be 1/100
Calculation ,
volume of stock transferred ( Vi ) = 1 ml
Diluent volume = 99 ml
The dilution factor (DF) : ratio of concentration of stock solution and diluted solution or ratio of the volume of final solution to the initial volume from stock solution
From equation of dilution :
M₁V₁=M₂V₂
Dilution factor = volume of stock transferred ( Vi ) / Final volume ( Vf )
The Final volume ( Vf ) = Diluent volume + stock volume
After putting the value of all given term in above equation we get the value of dilution factor .
Dilution factor = 1 ml / 1+ 99 = 1 / 100
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