Centrifugal force (centripetal acceleration) is used with a centrifuge to rapidly separate the precipitate from the liquid.
What is a centrifuge?
According to particle size and density, medium viscosity, and rotor speed, particles suspended in a liquid are separated using a centrifuge. Gravitational forces within a solution cause particles with densities greater than the solvent to sink and those with densities less than the solvent to float to the top.
Using the centrifugal force to separate particles found in a solution, centrifugation is a mechanical technique for separation. Depending on the size, shape, density, and rotor speed of the particles, different groups are created.
Thus, A centrifuge is used to quickly separate the precipitate from the liquid using centrifugal force (centripetal acceleration).
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Which of the following choices contain a halogen?
Ca, B, S, Cd
Al, Si, I, Au
Rb, W, Ir, Xe
S, Ar, Pt, P
000
The second option Al, Si, I, Au contain halogen that is Iodine (I).
Fluorine, chlorine, bromine, iodine, and astatine are the five or six chemically related elements that make up the halogens group in the periodic table.Halogens are nonmetals. Fluorine, chlorine, and bromine are all gases at room temperature while bromine is liquid. Both iodine and astatine are solids. Halogens are extremely reactive; from fluorine to astatine, their reactivity decreases.The majority of halogen atoms are lipophilic and less water soluble.Halogens' extreme reactivity is one of its distinguishing characteristics. They can combine to generate a variety of compounds, including halides, interhalogens, and polyhalogenated compounds, as a result of their nature.Water, swimming pools, open wounds, dishes, and surfaces are frequently disinfected with bromine and chlorine.Halogen lamps contain trace amounts of a halogen, such as iodine or bromine.Thus, second option contain halogen.
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the rock's tendency to do this called
a. inertia
b. weight
c. acceleration
Answer:
a. inertia
Explanation:
Inertia means an object will continue its current motion until some force causes its speed or direction to change. The term inertia is properly understood as shorthand for "the principle of inertia" as described by Newton in his first law of motion.
How is the mass number of an atom calculated? (1 point)
total number of electrons
electrons plus neutrons
total number of protons
protons plus neutrons
The mass number of atoms is calculated by adding the number of neutrons and protons.
The smallest piece of stuff that makes up an element is an atom. It consists of a nucleus with protons and neutrons and orbitals with a specific number of electrons surrounding it. One can identify and distinguish an element's atom from the others by knowing the nuclear makeup of a certain atom. In actuality, the periodic table was created expressly to organize the elements in terms of their atomic and mass numbers and nuclear compositions.
According to the periodic chart, an atom's nuclear composition is closely related to its atomic and mass number. The number of protons in the nucleus or the number of electrons around an atom determines its atomic number for neutral atoms. The amount of components inside the nucleus affects the mass number, meanwhile. The total number of protons and neutrons in the nucleus is used to calculate it. As an illustration, the mass number of the element helium is 4, as its atom has two protons and two neutrons in its nucleus.
Therefore, the correct option is (d).
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What is the concentration in mass-volume percent for 13.9 g caf2 in 255 ml of solution?
The concentration in mass-volume percent of the solution is: 5.45 %
To solve this problem the formula and the procedure that we have to use is:
% m/v = m(solute)/v(solution) * 100
Where
% m/v = concentration in mass volume percentm = mass of solutev = volume of solutionInformation about the problem:
m(solute)= 13.9 gv(solution)= 255 ml% m/v =?Applying the concentration formula we get:
% m/v = m(solute)/v(solution) * 100
% m/v = (13.9 g/255 ml) * 100
% m/v = 0.0545 *100
% m/v =5.45 %
What is a solution?In chemistry a solution is known as a homogeneous mixture of two or more components called:
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Sample of gas occupies a volume of 64.9 ml. as it expands, it does 124.0 j of work on its surroundings at a constant pressure of 783 torr. what is the final volume of the gas?
The final volume of the gas is 123.9ml.
Given here, the pressure of the gas (P)= 783 torr = 1.03 atm (1atm = 760torr) and work done = 124joules.
The initial volume given here V₁= 64.9ml Or 64.9× 10⁻³l ( 1ml =10⁻³l) .
Now we calculate the final volume by work done formula,
Work done = P(V₂-V₁)
124 = 1.03( V₂- 64.9× 10⁻³)
On calculating this we get,
V₂= 123.9ml or 123× 10⁻³.
So, the final volume calculated and found to be 123.9ml or 123× 10⁻³.
Work done for a gas is defined as the pressure change multiplied by a volume change in the gas.
Thermodynamics is branch which examines a system’s energy and work. This branch of science, thermodynamics examines how heat, work, temperature, and energy are related. The thermodynamics refers to the transfer of energy from one location or form to another. The fundamental idea is that heat is a type of energy that is equivalent to a specific quantity of mechanical labour.
There are three most important laws of thermodynamics, they are zeroth law, first law, second law and third law of thermodynamics which have specific definitions.
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Which of the follwoing molecules will form hydrogen bonds? (ch3)3n (ch3)2nh fch2ch2f ch3och3
The follwoing molecule will form hydrogen bonds: (CH₃)₂NH.
Dimethylamine ((CH₃)₂NH) has a hydrogen atom directly attached with nitrogen atom, so can make an intermolecular hydrogen bond with the same molecule (see the picture below).
Hydrogen bond is an electrostatic attraction between two polar groups that occurs when a hydrogen atom (H), covalently bound to a highly electronegative atom such as flourine (F), oxygen (O) and nitrogen (N) atoms.
Trymethylamine ((CH₃)₃N), 1,2-difluoroethane (FCH₂CH₂F) and dimethyl ether (CH₃OCH₃) do not form the hydrogen bonds, because there are no hydrogen atoms attached directly to the fluorine (F), nitrogen (N) or oxygen (O) atoms.
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what is the valency of elements in the group 'v' of the modern periodic table? what is the reasons for the fact that reactivity of group 'v' elements decrease as we go down in the group?
Answer:
What is the valency of elements in the group 'v' of the modern periodic table?
Answer: -3
What is the reasons for the fact that reactivity of group 'v' elements decrease as we go down in the group?
Answer: On moving down the group, there is a decrease in the electron affinity of elements. It is because, as the size of an atom increases, the valence electrons get further away from its nucleus. Thus, the attraction between them decreases.
What 3 properties of the major groove are advantageous to alpha helix insertion?
The major groove allows proteins to detect and attach DNA sequences, conformational DNA alterations, and has gene regulatory proteins.
The major groove and the minor groove are formed by the gaps between the intertwined backbones. The major groove is broader than the minor groove, as you pointed out. Proteins may attach to and detect DNA sequences from outside the helix thanks to these grooves. Because the grooves show the margins of each base pair inside the helix, proteins may chemically identify certain DNA sequences. Once a protein attaches, the DNA may alter in conformation, which may affect how genes are expressed.
Longer DNA sequence lengths may be seen because the primary groove is broader, which also makes it possible to tell one sequence from another. As a result, the major groove is bound by numerous gene regulatory proteins at certain DNA sequences.
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Could changes in polar ice far away be causing sea levels around the world to rise over time? Why or why not?
Explanation
As temperatures rise, glaciers melt faster than they accumulate new snow. As these ice sheets and glaciers melt, the water eventually runs into the ocean, causing sea level to rise. Icebergs and frozen seawater also melt in warm temperatures but are not significant contributors to sea level rise.
When glaciers collapse and pieces of glacial ice fall into the ocean, they are called icebergs. Because the water from melting glaciers is held on land, the runoff greatly raises the volume of water in the ocean, causing a rise in sea level.
The enormous ice sheets that are present in Greenland and Antarctica are also referred to as glaciers. Glaciers melt more quickly as temperatures rise than they can store new snow. As these glaciers and ice sheets melt, the water eventually enters the ocean, raising the sea level.
Changes in the amount of sea ice can impede the regular flow of the ocean, which can impact the climate globally. The polar regions are the most vulnerable regions on Earth to climate change because even a slight temperature increase can cause larger warming over time.
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When two monosaccharides condense to form a disaccharide, what is the other product of the reaction? enter the molecular formula.
When two monosaccharides combine to make a disaccharide, water is the byproduct.
What are monosaccharides ?The most fundamental building blocks from which all carbohydrates are constructed are monosaccharides, commonly known as simple sugars. They are the most basic types of sugar. They are typically crystalline solids, colorless, and soluble in water.
These three monosaccharides—glucose, fructose, and galactose—are crucial for nutrition. Six carbon atoms, twelve hydrogen atoms, and six oxygen atoms make up each single sugar molecule.
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Sometimes when performing a crystallization, one solvent alone will not work and you have to use a solvent-pair. Will the solvent pair hexane and diethyl ether work? why or why not?.
Yes, hexane and diethyl ether, a solvent pair, will definitely function as a team during crystallization.
This is due to the fact that crystal formation requires a miscible solvent pair. Normally, two solvents—one in which the compound is soluble and one in which it is not—are required for crystallization. Additionally, these two solvents ought to mix easily.
Hexane and diethyl ether, the given solvent pair, are miscible with one another. Therefore, we can crystallize using the solvent pair mentioned above.
What is crystallization?
Crystallization is the process of increasing the concentration of a solution to a supersaturated state in order to form solid particles in a homogeneous phase. Crystallization is the process by which crystals are formed from either melted material or a solution.
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The synthesis of carbohydrates can be particularly difficult because of the large number of chiral centers and oh functional groups present. Epoxides can be useful synthetic intermediates in carbohydrate synthesis. Draw the product of the reaction of a phenyl gilman reagent with this epoxide.
Because of their many chiral centers and OH functional groups, carbohydrates can be extremely challenging to synthesize. In the production of carbohydrates, epoxides can be helpful synthetic intermediates. Take the outcome of the reaction between this epoxide and a phenyl Gilman reagent. To identify stereochemistry when it occurs, use the wedge/hash bond tools. Clearly identify the wedge or hash bonds that characterize the cis/trans stereochemistry of fused rings. • If enantiomers form, draw them both. The drop-down menu's + symbol can be used to divide up numerous goods. The typical formula for the Gilman reagent is R2CuLi, and it is a lithium and copper (diorganocopper) reagent. Alkyl or aryl groups make up R.
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Which of the following organisms could be considered a primary consumer
and a secondary consumer according to the food web?
Snake
Mouse
Fox
Caterpillar
Answer:
Primary - Mouse , Secondary-Snake
Answer:
A Caterpillar is a primary consumer!
A mouse is secondary
and foxes and snakes are tertiary consumers!
Explanation:
Alright so lets looks back
Caterpillars eat leaves and grass called "Producers"
Mouses eat the primary producers and generically make less energy
Foxes and Snakes are the ones who eat the secondary consumers, so they are called tertiary consumers.
Hope this helps!
A block of wood is measured to be 3.25 cm on each side the density of this particular word is 0.9 45g/7cm3 what is the mass of the sample will the sample float in the water
Mass of the block of wood = 3.25 cm
Density of the block of wood = 0.945 g/ cm³
Which types of chemical reactions occur faster at equilibrium, the formation of products from reactants or reactants from products?
At equilibrium, the formation of products from reactants or reactants from products occur at the same rate.
Reaction goes in both direction, both reactants and product are present.
The amount of substance of reactants and products of reaction do not change when chemical reaction is in chemical equilibrium.
In a chemical reaction, chemical equilibrium is the state in which both reactants and products are present in concentrations which not change with time.
Speed of direct and irreversible chemical reaction are equal.
For example, balanced chemical reaction in equilibrium:
3H₂ + N₂ ⇄ 2NH₃
Hydrogen (H₂ ) and nitrogen (N₂) are reactants.
Ammonia (NH₃) is product of the reaction.
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When heat is removed from a liquid,what is most likely to happen?
When heat is removed from water for example, it turns from a liquid to a gas.
The particles in water absorb this energy, giving them a higher energy level. The particles are able to change state when thermal energy is removed.
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Hope this helps!
Have a great day and God bless! :)
How are the following aspects of a reaction affected by the addition of a catalyst?.
Any reaction that has a catalyst added to it has its activation energy reduced, accelerating the rate of the reaction. Although it doesn't initiate the reaction, it lowers the energy needed to do so. Furthermore, doing so causes the catalyzed reactions to produce an intermediate product.
The catalyst's properties are the key idea used to address this question. The molecules known as catalysts have a strong tendency to alter the rate of a reaction. It should be noted that the catalyst itself does not change significantly.
A catalyst accelerates both the forward and backward reactions at a faster rate. It also lowers the activation energy for both forward and backward reaction.
Without a catalyst, the reaction would speed up in any direction. However, a catalyst can never increase the rate of a reaction in both directions at the same time—neither forward nor backward. A catalyst lowers the activation energies of both forward and backward reactions, causing them to accelerate in the desired direction.
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• evolution
• ecosystems
•
•
light and energy
solar system
Earth (or Earth's atmosphere and oceans)
a science topic that is not listed above
List the science topic you have selected here:
Answer:
I dont really understand what you mean by this but if your asking for us to list subjects than i have a few:
.Biology
.Electricity
.The human body (Anatomy)
. Chemistry
When water dissolves a substance, weak charges on water molecules attract oppositely charged portions of the substance, pulling them out into solution. Which property of water accounts for this occurrence?.
When water dissolves a substance, weak charges on water molecules attract oppositely charged portion of the substance, pulling them out into the solution. The property of water that accounts for this occurrence is polarity.
We all know that water is a polar substance, but what does that mean? Whenever hydrogen atoms combine with other highly electronegative elements like fluorine, chlorine or oxygen. a partial positive charge forms on the hydrogen, while a partial negative charge forms on the electronegative element, making it a dipole. This is what makes water a polar substance.
When a substance, for example, table salt is added to a glass of water, the positive dipole (partial positive charge) in the hydrogen atoms attract the negatively charged chlorine ions in the salt, while the negative dipole in the oxygen atom attracts the positive sodium ions in the salt, pulling them into the solution. That is why, the salt crystals disappear a while after they were added into the glass of water.
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A+sample+of+hamburger+had+a+total+mass+of+200.+g,+of+which+30.0+g+was+found+to+be+fat.+what+is+the+percent+of+fat+in+this+hamburger+sample?
a. 15.0%
b. 30.0%
c. 6.00%
d. 13.3%
e. 6.67%
A+sample+of+hamburger+had+a+total+mass+of+200.+g,+of+which+30.0+g+was+found+to+be+fat.
The percentage of fat that was in the hamburger is:
a. 15.0%
What is fat?
Our diets include nutrients that provide us energy and other things our bodies require. Proteins, lipids, and carbs make up the three main types of nutrients in meals. Fat is the primary energy storage type in the body and is used as a fuel source by the body.
The sample of hamburger has a weight of 200g, of which 30g is fat.
Thus, the amount that is the percentage of fat in the sample of the given hamburger is = 30*100/200 percent
= 15 %
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Assume that Element Q has the following three isotopes: 2480, 252Q, and 259Q. If the atomic mass of Q is 258.63, which of its isotopes is most abundant?
Complete the following:
• Make a claim that answers the question
• Support your answer with evidence from the information given
• Explain your reasoning
which compound has the highest magnetic moment
18. Math Connection The density of water is 1.0 g/cm*. How many kilograms of water
does a submerged 120-cm° block displace. Recall that 1.0 kg weighs 9.8 N on
Earth. What is the buoyant force on the block?
The mass of water displaced by the block is 120 g. The buoyant force on the block is the product of its weight and g value that is 1.17 N.
What is buoyant force ?The force that brings an object to float on a fluid is called buoyant force. It is directly proportional to the displaced mass of the fluid by the submerged object.
Given that, density of water = 1 g/cm³
volume of block = 120 cm³
then, displaced mass of water = density of water × volume of block
m = 120 g = 0.12 kg
Buoyant force = mass displaced × g
Fb = 0.12 × 9.8 N = 1.17 N
Therefore, the buoyant force on the block is 1.17 N.
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(i) Transition elements have similar properties. qua
Explain why in terms of electronic structure.
Since they all have the same number of valence electrons, transition elements share similar characteristics.
Why do elements have similar properties?The quantity of valence electrons in an element determines its physical and chemical properties. The number of valence electrons shared by elements belonging to the same group is constant. As a result, the physical and chemical properties of elements belonging to the same group are similar.
Why is electronic configuration of transition elements irregular?The energy of n1 d orbitals and ns orbitals differs slightly in transitional elements. As a result, an incoming electron may occupy either shell. As a result, the electronic configurations of transition elements show numerous irregularities.
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The pressure in a 100.0 mL container is 125.0 kPa at 25 degrees celsius. What will be the pressure if the temperature is raised to 50 degrees celsius?
The pressure obtained when the temperature is raised to 50 degrees celsius is 135.5 KPa
Data obtained from the questionFrom the question given above, the following data were obtained:
Initial pressure (P₁) = 125 KPaTemperature (T₁) = 25 °C = 25 + 273 = 298 KVolume = 100 mL = Constant Final temperature (T₂) = 50 °C = 50 + 273 = 323 KFinal pressure (P₂) =? How to determine the final pressureThe final pressure can be obtained as illustrated below:
P₁V₁ / T₁ = P₂V₂ / T₂
Since the volume is constant, we have:
P₁ / T₁ = P₂ / T₂
125 / 298 = P₂ / 323
Cross multiply
298 × P₂ = 125 × 323
Divide both side by 298
P₂ = (125 × 323) / 298
P₂ = 135.5 KPa
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Cells can best be described as what?
A.
part of the air people breathe.
B.
tiny particles found in food.
C.
the smallest form of matter.
D.
building blocks of all living things.
Answer:
D
Explanation:
because all cells in our body help us to build the body because they are multicellular
Answer: D) building blocks of all living things
Explanation:
When a boy jumps on his bed, his feet ouch the bed down. What is the reaction force
The bed pushes his feet up
Answer:
The reaction is the weight force of the boy
Balance the following chemical equation (if necessary): zns(s) aip(s) --> ai2s3(s) zn3p2(s)
The balanced equation is as follows:
3ZnS(s) + 2AiP(s) ⇒ [tex]Ai_{2} S_{3}[/tex] (s) + [tex]Zn_{3} P_{2}[/tex] (s)
To write a balanced equation:
1.The left and right sides of the reaction arrow of a balanced equation have an equal number of each type of atom.
2.The reactants and products are placed on the left and right sides of the arrow, respectively, to create a balanced equation.
3.Coefficients, which appear as a number before a chemical formula, represent moles of a compound. The number of atoms in a single molecule is indicated by the subscripts (numbers below an atom).
4.Multiply the subscript and the coefficient to determine the number of atoms. Add all the atoms on each side of the arrow if the atom is present in more than one reactant or product.
5.The coefficient or subscript "1" indicates that there is just one molecule or atom.
Therefore, the balanced equation is as follows:
3ZnS(s) + 2AiP(s) ⇒ [tex]Ai_{2} S_{3}[/tex] (s) + [tex]Zn_{3} P_{2}[/tex] (s)
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A fission reaction takes place with a mass defect of 0.0060 kg. how much energy os produces?
5.4 × 10¹⁴ Jules of energy is produced.
Mass defect is the difference between the mass of a composite particle and the sum of the masses of its parts.
The mass defect can be explained using Albert Einstein's formula E = mc².
E is the energy in joules.
m is the mass defect in kilograms.
c is the velocity of light in metres per second (3.00 x 10⁸ m/s).
m = 0.0060 kg
E = 0.0060 kg × (3.00 x 10⁸ m/s)²
E = 5.4 × 10¹⁴ J
Average binding energy per nucleon equals total binding energy divided by mass number (sum of protons and neutrons in an atom).
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Calculate the ph of the solution resulting from the addition of 25.0 ml of 0.20 m hcl to 50.0 ml of 0.10 m aniline (c6h5nh2). kb (c6h5nh2) = 3.8 x 10-10
-1.82 is the ph of the solution resulting from the addition of 25.0 ml of 0.20 m HCl to 50.0 ml of 0.10 m anilines (c6h5nh2). kb (c6h5nh2) = 3.8 x 10-10.
In chemistry, the pH scale is used to define the acidity or basicity of an aqueous solution. Historically, pH stood for "potential of hydrogen." The pH values of acidic solutions are typically lower than those of basic or alkaline solutions.
A negative pH is calculated when the molarity of hydrogen ions in a strong acid is more than 1 N, even though the pH scale generally ranges from 0 to 14. (Normality).
HCl reacts with aniline, thus:
C₆H₅NH₂ + HCl → C₆H₅NH₃⁺ + Cl⁻
Moles of HCl are:
0.025L × (0.20mol HCl / L) = 5.005 mol HCl
Moles of aniline are:
0.050L × (0.10mol HCl / L) = 0.005 mol aniline
Thus, after reaction, will remain:
5.005 mol - 0.005 mol = 5mol HCl
Moles of HCl in solution are equal to moles of H⁺, thus, moles of H⁺ are: 5 mol H⁺
As total volume is 25.0mL + 50.0mL = 75.0mL ≡ 0.075L
5 mol / 0.075L = 66.66 M
pH of solution = -log[H⁺]
pH = -log 66.66 M
pH = -1.82
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3. What if only 25% of Greenland’s ice melted into the ocean? Explain your reasoning.
