The electrostatic potential for an atom is also called D) coulomb potential.
What is Coulomb's law?Coulomb's law is the law of electric force that states that the force of attraction or repulsion between two charges is directly proportional to their charges and inversely proportional to the square of the distance between them.
The electrostatic potential energy between two charges is also proportional to the product of the charges and inversely proportional to the distance between them squared.
Therefore, for an atom, the electrostatic potential is directly proportional to the charge of the nucleus and inversely proportional to the distance between the electrons and the nucleus.
Thus, the coulomb potential is the electrostatic potential between the positively charged nucleus and negatively charged electrons of an atom. The correct option is d) coulomb potential.
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What does how light or dark an object appears depend on?
Answer:
By the wavelength of the light transmitted by it.
Explanation:
The color of a transparent object is determined by the wavelength of the light transmitted by it. An opaque object that reflects all wavelengths appears white; one that absorbs all wavelengths appears black.
Which of the following is the best explanation for why it is important to follow lab safety guidelines
a. Following laboratory safety guidelines prevents all lab accidents.
b. Following laboratory safety guidelines minimizes the chance of lab ac
C. Following laboratory safety guidelines prevents fires.
d. Following laboratory safety guidelines allows quick response during la
Please select the best answer from the choices provided
Answer:
B
Explanation:
The main aim of lab rules is to minimize the no of accidents
ASAP
The directions "shake well before using" are listed on special types of heterogeneous mixtures called
A- Solutions
B- Suspensions
I am currently learning this and I would say Suspensions!
Hope this helps :)
the specific heat of solid platinum 0.133 J/g c How much heat is absorbed when a 10 gram piece of platinum is warmed from 100 c to 150 c
The heat is absorbed when a 10 gram piece of platinum is warmed from 100 c to 150 c is 66.5 J
How to calculate heat is absorbed when a 10 gram piece of platinum is warmed from 100 c to 150 c?Energy is a sort of heat. Heat changes the condition of a substance when it is absorbed by it by weakening and rupturing the inter-particle bonds (solid to liquid for example). A phase change brought on by heat is NOT enough to raise the temperature. A reaction that absorbs heat is called endothermic.
The bulk of the body affects how much heat is absorbed. The bulk of the body directly affects how much heat energy is absorbed. where M is the body's mass and Q is the quantity of heat absorbed.
Using the equation H=cpmT and the water specific heat, the amount of heat absorbed is computed.
Given,
heat of slid platinum = 0.133
150 -100=50
heat absorbed = 0.133*10*50
= 66.5 J
Therefore , The heat is absorbed when a 10 gram piece of platinum is warmed from 100 c to 150 c is 66.5 J
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WHAT IS THE NAME OF THE COMPOUND Co(BrO)3?
Answer:
Explanation:
Cobalt bromate is the name of this compound
The name of the given compound is Cobalt(III) bromate.
Explanation:
While naming compounds of a transition element :
First, write the name of metal then its oxidation state in roman numbers in bracketsThen after that name of the anion.Given
The molecule formula of a compound\(Co(BrO)_3\):
To find:
The name of the given compound formula
Solution:
The charge on the cobalt ion = +3
The charge on the bromate ion = -1
Cation in formula = \(Co^{3+}\) = Cobalt cation
Anion in the formula= \(BrO^{-}\) = Bromate ion
So, the name of the given compound is Cobalt(III) bromate.
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calculate the amount of heat released from combustion of 2 g of wood. the heat capacity of the bomb calorimeter is 9.96 kj/°c .
If the heat capacity of the bomb calorimeter is 9.96 kj/°c, then the amount of heat released from combustion of 2 g of wood is 39.84 kJ.
To determine the amount of heat released from combustion of 2 g of wood, you need to use the formula
Q = C × ΔT Where:Q is the heat released or absorbed in joules (J)C is the heat capacity of the bomb calorimeter (given as 9.96 kJ/°C)ΔT is the change in temperature in degrees Celsius (°C)We can assume that all the heat released from the combustion of the wood is absorbed by the calorimeter, so we can use the heat capacity of the calorimeter to calculate the heat released. Since the calorimeter absorbs the heat, the value of Q will be negative (i.e. the heat is released).
Given: Mass of wood = 2 g Heat capacity of the bomb calorimeter = 9.96 kJ/°C First, we need to calculate the change in temperature. This can be done by measuring the temperature of the calorimeter before and after combustion. Let's assume that the temperature increases by 4.0 °C.ΔT = 4.0 °C Now, we can calculate the heat released: Q = C × ΔTQ = (9.96 kJ/°C) × (4.0 °C)Q = 39.84 kJ
Therefore, the amount of heat released from combustion of 2 g of wood is 39.84 kJ.
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How many 10 mg Minoxidil tablets would be needed to make 60 ml of a 2% solution? A) 120 tablets. B) 60 tablets. C) 30 tablets. D) 10 tablets.
To make a 60 ml of 2% Minoxidil solution, 120 tablets of 10 mg Minoxidil are required.
To make a 2% solution of Minoxidil, we need 2 grams of Minoxidil in 100 ml of solution.
First, we need to convert 60 ml to grams. Since 1 ml of water weighs 1 gram, we can assume that 60 ml of solution weighs 60 grams.
To make a 2% solution, we need 2 grams of Minoxidil in 100 ml of solution. This means that for 60 ml of solution, we need:
(2 grams / 100 ml) x 60 ml = 1.2 grams
Each Minoxidil tablet has a weight of 10 mg, which is equivalent to 0.01 grams. Therefore, the number of tablets needed is:
1.2 grams ÷ 0.01 grams per tablet = 120 tablets
So the answer is A) 120 tablets.
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What mass of LiO is needed to react with 1,060 g of CO2?
Mass of Li₂O= 719.809 g
Further explanationGiven
1,060 g of CO₂
Required
Mass of Li₂O
Solution
Reaction
Possible compound : Li₂O
Li₂O(aq) + CO₂(g) → Li₂CO₃(aq)
mol CO₂(MW=44 g/mol) :
= 1,060 g : 44 g/mol
= 24.09
From the equation, mol ratio of LiO : CO₂ = 1 : 1, so mol Li₂O : 24.09
Mass Of Li₂O(MW=29.88 g/mol) :
= mol x MW
= 24.09 x 29.88
= 719.809 g
According to the
graph, what happens
to the concentration
of A over time?
Concentration (M)
Reaction: 2A A₂
Time (sec)
A. It decreases and then levels out.
B. It decreases consistently.
C. It increases and then levels out.
D. It increases consistently.
The concentration of A decreases and then levels out. Option A
How does concentration of the reactant change?
In many chemical reactions, a reactant is consumed as the reaction progresses, leading to a decrease in its concentration over time. The reactant molecules are transformed into products, and as the reaction proceeds, the concentration of the reactant gradually diminishes.
At equilibrium, the concentrations of both reactants and products remain relatively constant over time, although they can coexist.
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a 0.465 g sample of an unknown compound occupies 245 ml at 298 k and 1.22 atm. what is the molar mass of the unknown compound? 38.0 g/mol 26.3 g/mol 33.9 g/mol 12.2 g/mol 81.8 g/mol
To calculate the molar mass of the unknown compound, we can use the ideal gas law equation g/mol is 33.9 g/mol.
I apologize for any confusion. Could you please provide more specific information or context regarding the compound you are referring to? Without knowing the specific compound or additional details, it is difficult to provide a meaningful response.In chemistry, a compound refers to a substance composed of two or more different elements chemically bonded together. For example, water (H2O) is a compound composed of hydrogen and oxygen.Compound Interest In finance, compound interest refers to the interest that is calculated on the initial principal as well as the accumulated interest from previous periods. This means that the interest earned in each period is added to the principal, and subsequent interest is calculated based on the new total.
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What is forensic
science?
Answer:
"Forensic science is a critical element of the criminal justice system. Forensic scientists examine and analyze evidence from crime scenes and elsewhere to develop objective findings that can assist in the investigation and prosecution of perpetrators of crime or absolve an innocent person from suspicion."
Explanation:
Strictly from: https://www.justice.gov/olp/forensic-science#:~:text=Forensic%20science%20is%20a%20critical,an%20innocent%20person%20from%20suspicion.
Forensic science is any science used to aid in a criminal/legal investigation
How is water sitting in a pitcher similar to chemical energy?
3. Round each measurement to three significant figures. Write your
answer in scientific notation
a. 87.073 meters
b. 4.3621 x 108 meters
C. 0.015 52 meter
d. 9009 meters
e. 1.7777 x 10-3 m
f. 629.55 m
4. Round each measurement in #3 to one significant figure. Write
your answer in scientific notation.
In scientific notation, the measurement of each figure to three significant measurements are as follows:
87.073 meters = 8.71 × 10⁻¹ meters4.3621 × 10⁸ meters = 4.36 × 10⁸ meters0.01552 meter = 1.55 × 10² meters9009 meters = 9.01 × 10² meters1.7777 x 10-3 m = 1.78 × 10⁻³ meters629.55 meters = 6.30 × 10² metersA significant figure is the digits in a number that is dependable and absolutely essential to express the quantity of a figure in positional notation. They are utilized to represent the appropriate degree of precision.
A scientific notation is used to express a large number in an easy decimal way multiplied by its power of 10.
From the given information, in scientific notation, and to three significant figures, we have:
87.073 meters = 8.71 × 10⁻¹ meters4.3621 × 10⁸ meters = 4.36 × 10⁸ meters0.01552 meter = 1.55 × 10² meters9009 meters = 9.01 × 10² meters1.7777 x 10-3 m = 1.78 × 10⁻³ meters629.55 meters = 6.30 × 10² metersTherefore, from the above concept, we can conclude that the scientific notation of each figure in three significant figures is shown in bold format.
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1
Water molecules are made up of
A
any two atoms bonded together.
B
two hydrogen atoms and one oxygen atom.
С C
atoms of only one type of element bonded together.
D
two oxygen atoms.
ere to search
Answer:
B
Explanation:
Water molecules combines of two hydrogen atoms and an oxygen atom
Answer:
B
Explanation:
A very large tank initially contains 100 L of pure water. Starting at time t=0 a solution with a salt concentration of 0.5 kg/L is added at a rate of 6 L/min. The solution is kept thoroughly mixed and is drained from the tank at a rate of 4 L/min. Answer the following questions. 1. Let y(t) be the amount of salt (in kilograms) in the tank after t minutes. What differential equation does y satisfy? Use the variable y for y(t). Answer (in kilograms per minute):
dt
dy
= 2. How much salt is in the tank after 20 minutes? Answer (in kilograms)
After 20 minutes, there would be 0.75 kilograms of salt in the tank.
1. Let's derive the differential equation that y(t) satisfies. The rate at which salt is added to the tank is given by the concentration of the solution (0.5 kg/L) multiplied by the rate at which the solution is added (6 L/min). The rate at which salt is drained from the tank is given by the concentration of salt in the tank (y(t) kg/L) multiplied by the rate at which the solution is drained (4 L/min). Therefore, the differential equation is:
dy/dt = (0.5 kg/L * 6 L/min) - (y(t) kg/L * 4 L/min)
Simplifying further, we have:
dy/dt = 3 - 4y(t)
2. To find the amount of salt in the tank after 20 minutes, we can solve the differential equation. One approach is to find the particular solution by assuming y(t) takes the form of a constant, y. Substituting this into the differential equation, we have:
dy/dt = 3 - 4y
Setting dy/dt to zero (since y is constant), we can solve for y:
0 = 3 - 4y
4y = 3
y = 3/4
y = 0.75 kg
Therefore, after 20 minutes, there would be 0.75 kilograms of salt in the tank.
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Giselle is working with a chemical substance in a laboratory. She observes that when the chemical is heated, it gives off a gas. She assumes that the gas is oxygen but decides to test this assumption to verify it. Which type of scientific knowledge is Giselle’s assumption?
HYPOTHESIS.
In layman terms, a hypothesis is a rough assumption made according to scant observations. Then test to prove the assumption.
Explanation:
A sonar device on a ship sends ultrasound waves under the water to locate a submarine. It takes
the ultrasound wave 5 seconds to travel from the device to the sunken submarine and back
again. How far below the surface is the sunken submarine? (Be sure to use the proper units of
measure) * 5
Answer:
3750 m
Explanation:
We must first know the speed of sound in water in order to solve this problem.
So, speed of sound in water = 1500 meters per second
Now time taken = 5 seconds
Given that;
v = 2x/t
where x is the distance below;
vt = 2x
x = vt/2
x = 1500 * 5/2
x = 3750 m
the ratio of the number of molecules fluorescing to the total number of excited molecules is called:
The ratio of the number of molecules fluorescing to the total number of excited molecules is called fluorescence quantum yield.
Fluorescence quantum yield refers to the efficiency of a molecule in undergoing fluorescence, which is the emission of light upon absorption of photons. It is defined as the ratio of the number of fluorescent molecules to the total number of excited molecules. The fluorescence quantum yield provides a measure of how likely a molecule is to fluoresce compared to other non-radiative relaxation pathways, such as internal conversion or vibrational relaxation. A high quantum yield indicates a higher probability of fluorescence, while a low quantum yield indicates a lower probability.
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What has the most direct cause to the increase in the number and ferocity (strength) of storms hitting the Caribbean and the United States in recent years?
Answer:
High amount of humidity
Explanation:
This is especially common in the Caribbean, where hot temperatures very moisture and warm air provide near-ideal circumstances for hurricane formation, as assessed by the Saffir-Simpson classification and the Power Distribution Index.
"Hurricanes may originate everywhere in the Atlantic basin, from the subtropical central Atlantic to the Gulf coast. However, in order to make this all the way to the West Coast of the United States, the storms must pass over a lengthy length of sea water which is far too small to support hurricanes.
The storm strength is influenced by a lot of factors. Due to world warms and increase in the amount of humidity.
What is causing the increase in storm strength?
Studies has shown due too the warming of the world, hurricanes and other tropical cyclones are said to be more stronger.
This is due to the fact that warmer water gives more of the energy that boast storms. A rise in stronger hurricanes is due to warming never ending.
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Reversible protein phosphorylation controls the activity, structure, and cellular localization of many types of proteins. What class of enzymes are responsible for adding phosphoryl groups to proteins? What class of enzymes removes them?
Which amino acids are able to be phosphorylated?
List three general ways in which the covalent addition of a phosphate group to an amino acid side chain can effect conformational change of a protein.
Reversible protein phosphorylation controls the activity, structure, and cellular localization of many types of proteins. Protein kinases add a phosphoryl group to proteins while protein phosphatases remove them.
The amino acids that are able to be phosphorylated are the hydroxyl-containing side chains of serine, threonine, and tyrosine. The covalent addition of a phosphate group to an amino acid side chain can effect conformational change of a protein in three general ways:
1. Charge change: The negatively charged phosphate group will change the electrostatic properties of the amino acid side chain to which it is attached, thus disrupting salt bridges, and charge interactions that stabilize the protein's native conformation.
2. Steric hindrance: The addition of a phosphate group increases the size of the amino acid side chain, which can create steric hindrance. This can introduce a kink or bend in the polypeptide chain that leads to conformational changes of the protein.
3. Hydrogen bonding: The addition of a phosphate group to an amino acid side chain can introduce a hydrogen-bonding group into the protein structure.
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PLEASE Help!!!! Alpha emitters can be dangerous when they are ______________.
a
eaten in food
b
all of the above
c
inhaled into the lungs
d
consumed in drinking water
Answer:
Alpha particles cannot penetrate most matter. A piece of paper or the skin is enough to stop the penetration of alpha particles.
Radioactive elements that emit alpha particles can be very harmful when inhaled, swallowed or absorbed into the bloodstream through the skin.
Explanation:
all of the above
Sea levels change throughout the years. Explain how the change in the height of the sea level would affect how we see the continents fitting together.
PLEASE ANSWER SRYLS ASAP PLEASEE
Answer:
Size!
Explanation:
As Sea Levels increase, more of the land mass would be covered up by water. Due to this, it seems like the continents are much more smaller than they really are.
(Apologize if its wrong, it should make sense!)
what is the number of grams of N₂ (g) that contains 1.80 x 10^24 molecules?
Answer:
83.69 gm
Explanation:
molar weight of N2 = 28
Find the number of moles then multiply by this
1.8 x10^24/ (6.022x10^23) * 28 =83.69 gm
(a) What is always the maximum temperature needed for steam distillation?
The maximum temperature needed for steam distillation is always 100 degrees Celsius, which is the boiling point of water.
What is Steam Distillation?
The maximum temperature needed for steam distillation is always 100 degrees Celsius (212 degrees Fahrenheit). Steam distillation is a process where a mixture of two immiscible liquids, typically water and an organic compound, is heated to produce steam. The steam carries the volatile components of the organic compound, and they are then condensed and collected. The maximum temperature of 100 degrees Celsius corresponds to the boiling point of water, which is the most commonly used liquid in steam distillation. This temperature is required to generate steam, which is used to extract essential oils or other volatile compounds from plant materials. However, it is important to regulate the temperature carefully to avoid overheating and damaging the compounds being extracted.
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If 2.18 grams of Br2 react with excess KI, how many grams of KBr are formed? Br2 + 2 K1 - 12 +2 KB
Answer:
2.18 grams of Br2 reacts to produce 3.25 grams of KBr
Explanation:
The balanced equation is
2 KI + Br2 → 2 KBr + I2
2 moles of KI and 1 mole of Br2 reacts to produce two molecules of KBr
Mass of two moles of KI = 2 * 166 grams
Mass of one mole of Br2 = 159.808 grams
Mass of two moles of KBr = 2* 119 grams
Thus, 159.808 grams of Br2 reacts to produce 2* 119 grams of KBr
2.18 grams of Br2 reacts to produce {(2* 119)/ 159.808} * 2.18 grams of KBr
2.18 grams of Br2 reacts to produce 3.25 grams of KBr
How many molecules are in 33.6 liters of neon (Ne) gas at STP?
Answer:
moles or atoms?
Explanation:
you can't have a molecule of any so there's two different answers that I can give you:
how many moles? 1.5
how many atoms? 9.03x10^23 atoms
At STP 1 mole of an ideal gas occupies 22.4L.
33.6 L x 1 mol/22.4 L = 1.5 moles of Neon
1.5 moles Ne x 6.02x1023 atoms/mole = 9.03x1023 atoms
9.03x10²³ molecules are in 33.6 liters of neon (Ne) gas at STP. At STP 1 mole of an ideal gas occupies 22.4L.
What is atom?The smallest unit of matter that may be split without producing electrically charged particles is the atom. It is also the smallest piece of substance with chemical element-like characteristics. Electric forces, which link electrons towards the nucleus of atoms, cause them to be drawn to any positive charge.
Space makes up the majority of an atom. The remainder is made up of a cloud of negatively charged electrons around a positively charged nucleus made up of protons and neutrons. Compared to electrons, that are the smallest charged particles in nature, the nucleus is tiny and dense.
At STP 1 mole of an ideal gas occupies 22.4L.
33.6 L x 1 mol/22.4 L = 1.5 moles of Neon
1.5 moles Ne x 6.02x10²³ atoms/mole = 9.03x10²³ atoms
Therefore, 9.03x10²³ molecules are in 33.6 liters of neon (Ne) gas at STP.
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What will be the new volume of a balloon if it has a volume of 350 mL at 19 C and 1 atm, and rises in the air to a temp of 17 C and 0.8 atm?
The new volume of the balloon at 17°C and 0.8 atm is approximately 434.5 mL.
What is the final volume of the balloon?The combined gas law put together both Boyle's Law, Charles's Law, and Gay-Lussac's Law.
It is expressed as:
\(\frac{P_1V_1}{T_1} = \frac{P_2V_2}{T_2}\)
Given that:
Initial volume V₁ = 350 mLInitial pressure P₁ = 1.0 atmInitial temperature T₁ = 19°C = ( 19 + 273.15)K = Final pressure P₂ = 0.8 atmFinal temperature T₂ = 17°C = ( 17 + 273.15 ) = 290.15KFinal volume V₂ = ?Plug the given values into the combined gas law formula and solve for the final volume.
\(\frac{P_1V_1}{T_1} = \frac{P_2V_2}{T_2}\\\\P_1V_1T_2 = P_2V_2T_1\\\\V_2 = \frac{P_1V_1T_2}{P_2T_1} \\\\V_2 = \frac{1.0atm\ *\ 350mL\ * \ 290.15K}{0.8atm\ *\ 292.15K } \\\\V_2 = 434.5\ mL\)
Therefore, the final volume is approximately 434.5 mL.
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2. Consider dimethyl ether at 300 K which has an angle averaged radius of 0.25 nm. a) Calculate its collision frequency at 1 bar and 1 Pa. b) Calculate its decomposition rate constant k (CH3)2CO produ
a) The collision frequency of dimethyl ether can be calculated using the kinetic theory of gases. The collision frequency is given by the equation:
\(\[\text{{Collision frequency}} = \frac{1}{4} \sqrt{\frac{8 \cdot k \cdot T}{\pi \cdot m}}\]\)
where k is the Boltzmann constant, T is the temperature in Kelvin, and m is the mass of dimethyl ether molecule. Given that the angle-averaged radius of dimethyl ether is 0.25 nm, we can calculate the mass of the molecule using its density or molar mass.
b) To calculate the decomposition rate constant of (CH3)2CO, we need additional information such as the reaction mechanism and reaction conditions. The rate constant for a chemical reaction depends on factors like temperature, activation energy, and the presence of catalysts. Without these details, it is not possible to calculate the decomposition rate constant accurately.
In conclusion, the collision frequency of dimethyl ether at a specific temperature can be calculated using the kinetic theory of gases. However, to calculate the decomposition rate constant of (CH3)2CO, additional information about the reaction conditions and mechanism is needed.
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the cell density of a liquid sample is determined using the standard plate count method with the serial dilution scheme that is shown. what is the original cell density (ocd) of the liquid sample in cfu/ml? dilution a. 1.02 x 107 b. 102 c. 1.02 x 108 d. 1.02 x 106 e. 1.02 x 103
The original cell density of the liquid sample is 1.02 * 10^{6} cfu/ml.
To explain, the standard plate count method is used to determine the number of viable bacteria in a liquid sample. This involves serial dilution of the sample to obtain a range of dilutions, which are then plated onto agar plates to allow bacterial growth. The number of bacterial colonies that form on the plates is counted, and this count is used to calculate the original cell density of the sample.
In this case, the dilution factor for the sample is not given, so we cannot calculate the original cell density directly. However, we can use the information provided in the answer options to determine the correct answer.
The answer options give us dilution factors for the sample, which are expressed as powers of 10 (e.g. option b = 102 = 10^{2}). The dilution factor is the reciprocal of the fraction of the original sample that was plated (e.g. a dilution of 10^{-2} means that 1/100th of the original sample was plated).
To find the original cell density, we need to multiply the count of bacterial colonies on the plate by the dilution factor and divide by the volume of the plated sample. We can assume that the volume of the plated sample is the same for all dilutions, so we just need to compare the counts and dilution factors to determine which option gives the correct original cell density.
Looking at the answer options, we can see that option d has a dilution factor of 10^-6, which means that 1/1,000,000th of the original sample was plated. If we assume that there were 102 colonies on the plate for this dilution, then the original cell density would be:
\frac{(102 * 10^{6}) { 1} = 1.02 * 10^{8} cfu/ml
However, we can see that this is not one of the answer options given. The next closest option is d, which has a dilution factor of 10^-6 and a count of 102 colonies. Plugging these values into the equation above gives:
\frac{(102 * 10^{6}) }{ 1} = 1.02 * 10^{6} cfu/ml
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select any and all processes that work by depositing powder layers and solidifying each layer with a laser.
Process that work by depositing powder layers solidifying each layer with a laser is selective laser sintering, direct metal laser sintering.
Direct metal laser sintering also called selective laser sintering is a type of metal additive manufacturing or 3D printing. selective laser sintering metal heat the metal powder until it fully melts into liquid but direct metal laser sintering does not melt the metal powder so in that direct metal laser sintering needed less energy.
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