Answer:
True
Explanation:
Messelson and strahl explain the semiconservative existence of DNA replication by using CsCl gradient centrifugation. The hardest would go and rest at the base of the test tube, while the lightest would be at the top, the lightest would find a position between the heavy and the lightest. When the heavy tube is centralized, from a pool of light, bulky and moderate DNA.
This technique is called density-gradient centrifugation. Hence, the given statement is true.
Question #37.P.2A.2
Which statement about the periodic table is true?
a. Elements in the same column share similar properties.
b. Elements in the same row share similar properties.
c. Elements on the left have a larger nucleus than elements on the right.
d. Elements at the top of each column have the highest atomic mass in that column.
_BaS + _PtF2 → _BaF2 + _Pts
[tex]\huge\underline\mathbb\pink{ANSWER\::}\\\\[/tex]
_BaS + _PtF2 → _BaF2 + _Pts
Barium Sulfide + Platinum(II) Fluoride = Barium Fluoride + Platinum(II) Sulfide.
=> 1 BaS + 1 PtF2 → 1 BaF2 + 1 PtS
[tex]\\\\\\[/tex]
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Aluminum sulfate reacts with barium chloride to form the insoluble compound, barium sulfate. The reaction proceeds according to the balanced equation below:
1Al2(SO4)3 + 3BaCl2 → 2AlCl3 + 3BaSO4
Marie reacts 150 g of aluminum sulfate with 200 g of barium chloride in order to produce insoluble barium sulfate for her crystallography studies. Determine the limiting and excess reactants for this reaction.
Molar mass aluminum sulfate: 342.15 g/mol
Molar mass barium chloride: 208.23 g/mol
Molar mass barium sulfate: 233.38 g/mol
Answer: [tex]BaCl_2[/tex] is the limiting reagent and [tex]Al_2(SO_4)_3[/tex] is the excess reagent.
Explanation:
To calculate the moles :
[tex]\text{Moles of solute}=\frac{\text{given mass}}{\text{Molar Mass}}[/tex]
[tex]\text{Moles of aluminium sulphate}=\frac{150g}{342.15g/mol}=0.438moles[/tex]
[tex]\text{Moles of barium chloride}=\frac{200g}{208.23g/mol}=0.960moles[/tex]
The balanced chemical reaction is:
[tex]Al_2(SO_4)_3+3BaCl_2\rightarrow 2AlCl_3+3BaSO_4[/tex]
According to stoichiometry :
3 moles of [tex]BaCl_2[/tex] require = 1 mole of [tex]Al_2(SO_4)_3[/tex]
Thus 0.960 moles of [tex]BaCl_2[/tex] will require=[tex]\frac{1}{3}\times 0.960=0.320moles[/tex] of [tex]Al_2(SO_4)_3[/tex]
Thus [tex]BaCl_2[/tex] is the limiting reagent as it limits the formation of product and [tex]Al_2(SO_4)_3[/tex] is the excess reagent as it is left.
A solution of the primary standard potassium hydrogen phthalate (KHP), KHC8H4O4 , was prepared by dissolving 0.4877 g of KHP in about 50 mL of water. Titration of the KHP solution with a KOH solution of unknown concentration required 21.66 mL to reach a phenolphthalein end point. What is the concentration of the KOH solution
Answer:
The impact of dinosaurs caused Dwayne Johnson to beat paper in rock paper scissors as the weak strength of the plants on the moon are diabolical in the atmosphere.
Explanation:
Thats why me and Selena Gomez share the same light bulb.
1. Which kingdom is made up of only autotrophs?
A. Protista
I
B. Animalia
C. Plantae
D. Phylum
Answer: I believe it's C
Hope this helped<3
Can you please make my answer brainly
Consider the addition of an electron to the following atoms from the fourth period. Rank the atoms in order from the most negative to the least negative electron affinity values based on their electron configurations. Atom or ion Electron configuration BrBr 1s22s22p63s23p64s23d104p51s22s22p63s23p64s23d104p5 GeGe 1s22s22p63s23p64s23d104p21s22s22p63s23p64s23d104p2 KrKr 1s22s22p63s23p64s23d104p61s22s22p63s23p64s23d104p6 Rank the electron affinity from most negative to least negative. To rank items as equivalent, overlap them. View Available Hint(s)
Answer:
Br>Ge>Kr
Explanation:
Electron affinity is the energy change that results from adding an electron to a gaseous atom(Khan Academy). It is also defined as "the amount of energy released when an electron is attached to a neutral atom or molecule in the gaseous state to form a negative ion" (Wikipedia).
Electron affinity increases from left to right in the periodic table. However, the noble gases possess a complete outermost electron shell.
Hence, electron affinity can be raked from the most negative to the least negative for the three atoms as follows; Br>Ge>Kr
The transfer of energy is called
work
power
kinetic energy
potential energy
45424387/aHROCHM6Ly9mMS5hcHAUZWRIZW50dwouY29tL2xlYXJuZXItdWkdXN evious 4 Next Post Test: Chemical Reactions Submit Test Reade 4 Drag each number to the correct location on the equation. Each number can be used more than once, but not all numbers will be used. Balance the equation with the correct coefficients. 2 3 4 LO KCIO3 → KCI + 02 Reset Next 2021 Edmentum. All rights reserved
Answer:
The balanced equation is given below:
SiO2 + 4HF —> SiF4 + 2H2O
The coefficients are 1, 4, 1, 2
Explanation:
The equation for the reaction is given below:
SiO2 + HF —> SiF4 + H2O
The above equation can be balance by as follow:
There are 4 atoms of F on the right side and 1 atom on the left side. It can be balance by putting 4 in front of HF as shown below:
SiO2 + 4HF —> SiF4 + H2O
Therefore are 4 atoms of H on the left side and 2 atoms on the right side. It can be balance by putting 2 in front of H2O as shown below:
SiO2 + 4HF —> SiF4 + 2H2O
Now the equation is balanced.
Explanation:
A balanced equation obey the law of conservation of mass. According to this law, the mass can neither be created nor be destroyed. Here the balanced equation for the given reaction is 2KClO₃ → 2KCl + 3O₂.
What is a balanced equation?A chemical equation in which the number of atoms of reactants and products are equal on both sides of the equation is defined as the balanced chemical equation. The coefficients are the numbers that are used to balance a chemical equation.
The substances which appear on the left hand side of the equation are called the reactants whereas those which appear on the right hand side are called the products. The coefficients are essential to balance a equation.
The given equation can be balanced as follows:
2KClO₃ → 2KCl + 3O₂
Here the coefficients are 2, 2 and 3.
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A boy who weighs 30 kg is skateboarding at a speed of 5 m/s. What is the boys kinetic energy?
750 joules
75 joules
150 joules
375 joules
the answer is 375 joules
Team Iphone or
Team Android
hmm.......iphone ¯\_(ツ)_/¯
Which of the following is the Brønsted-Lowry definition of an acid?
Answer:
A Brønsted-Lowry acid is any species that can donate a proton (H +) to another molecule. A Brønsted-Lowry base is any species that can accept a proton from another molecule. In short, a Brønsted-Lowry acid is a proton donor (PD), while a Brønsted-Lowry base is a proton acceptor (PA).
How many milligrams of AgNO3 is required to completely react with 81.5 mg LiOH?
Balanced equation: AgNO3 + LiOH = AgOH + LiNO3
Answer:
[tex]m_{AgNO_3}=577.6mg[/tex]
Explanation:
Hello there!
In this case, according to the given chemical reaction, it is first necessary to compute the moles of reacting LiOH given its molar mass:
[tex]n_{LiOH}=81.5mg*\frac{1g}{1000mg}*\frac{1mol}{23.95g} =0.0034molLiOH[/tex]
Thus, since there is a 1:1 mole ratio between lithium hydroxide and silver nitrate (169.87 g/mol) the resulting milligrams turn out to be:
[tex]m_{ AgNO_3}=0.0034molLiOH*\frac{1molAgNO_3}{1molLiOH} *\frac{169.87gAgNO_3}{1molAgNO_3} *\frac{1000gAgNO_3}{1gAgNO_3} \\\\m_{AgNO_3}=577.6mg[/tex]
Best regards!
Answer:
AgNO3+Li-->LiNO3+Ag
It is already balanced.
And turns out to be M AgNO3=577.6mg
Hope this helps!
Calculate how many moles of NO2 form when each
quantity of reactant completely reacts.
2 N2O5(9) + 4NO2(g) + O2(9)
Part B
6.4 mol N205
Express your answer using two significant figures.
VALO
n =
Submit
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Part C
16.2 g N205
Express your answer using three significant figurer
Answer:
partB: n=2N205
partc:17.20
What is the correct name of the acid corresponding to the BrO3- oxoanion
Answer:
hello
Bromate is a bromine oxoanion and a monovalent inorganic anion. It is a conjugate base of a bromic acid.
Explanation:
thanks
#8 explain and answer
Answer:
B. The limiting reactant determines the maximum amount of product that can be formed.
answer both questions with explanation and answer will give brain list
Answer: 10. 39.7 g [tex]CH_3OH[/tex]
11. 650 g of [tex]HgO[/tex]
Explanation:
To calculate the moles, we use the equation:
[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text {Molar mass}}[/tex]
a) moles of [tex]H_2[/tex]
[tex]\text{Number of moles}=\frac{5.0g}{2.0g/mol}=2.5moles[/tex]
[tex]CO(g)+2H_2(g)\rightarrow CH_3OH(l)[/tex]
According to stoichiometry :
2 moles of [tex]H_2[/tex] produce = 1 mole of [tex]CH_3OH[/tex]
Thus 2.5 moles of [tex]H_2[/tex] produce=[tex]\frac{1}{2}\times 2.5=1.25moles[/tex] of [tex]CH_3OH[/tex]
Mass of [tex]CH_3OH=moles\times {\text {Molar mass}}=1.25moles\times 32g/mol=39.7g[/tex]
Thus 39.7 g of [tex]CH_3OH[/tex] will be produced from 5.0 g of hydrogen.
11. [tex]2HgO(s)\rightarrow 2Hg(l)+O_2(g)[/tex]
According to stoichiometry :
1 mole of [tex]O_2[/tex] is produced by = 2 moles of [tex]HgO[/tex]
Thus 1.50 moles of [tex]O_2[/tex] are produced by =[tex]\frac{2}{1}\times 1.50=3moles[/tex] of [tex]HgO[/tex]
Mass of [tex]HgO=moles\times {\text {Molar mass}}=3moles\times 216g/mol=650g[/tex]
Thus 650 g of [tex]HgO[/tex] woukd be decomposed to produce 1.5 mol of oxygen
What specialized plant structures increase the probability of successful reproduction?
Answer:
The pistil and the stamen.
Explanation:
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The pistil and the stamen are the specialized structures increase the probability of successful plant reproduction
what is reproduction in plants ?Reproduction in Flowering Plants occur both asexually and sexually, flowering plants or angiosperms, use the sexual mode of reproduction.
Reproduction in Flowering Plants occurs in the flower as both male and the female gametes are present in it, various parts of flower involve in the process of reproduction.
There are four important steps in the reproduction of flowering plants. such as Pollination, Gametogenesis, Fertilization
The flower is a specialized structure where reproductive part of the plant, containing the male and female reproductive organs which facilitate fertilization.
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8. A liquid boils when the vapor pressure of the liquid equals the atmospheric pressure on the surface
of the liquid. Using Reference Table H, determine the boiling point of water when the atmospheric
pressure is 90. kPa
Answer:
It is 98 degrees C.
Explanation:
#9 answer with explanation
Answer:
A. 6.0 mol H₂O
Explanation:
3 mol O₂ x [tex]\frac{2 mol H2O}{1 mol O2}[/tex] = 6 mol H₂O
What is the molar mass of MgSO 4 ?
Answer:
120.366 g/mol
Explanation:
Beth heats a pot of water to cook pasta. What may happen as a result of adding heat
Answer:
the pasta will soften
Explanation:
the pasta will boil and will soften up as a result of it being regular pasta
Determine the number of atoms of O in 22.3 moles of Al2(CO3)3.
Answer:
8.05 x 10^25 atoms O
Explanation:
moles O = moles Al2(CO3)3 x (6 moles O/1 mol Al2(CO3)3) = 22.3 x 6 = 133.8 moles O
atoms O = moles O x Avogadro number = 133.8 x 6.02 x 10^23 = 8.05 x 10^25 atoms O
Name the SI base units that are important in chemistry.
Units of the SI System
There are seven base units in the SI system:
the kilogram (kg), for mass
the second (s), for time
the kelvin (K), for temperature
the ampere (A), for electric current
the mole (mol), for the amount of a substance
the candela (cd), for luminous intensity
the meter (m), for distance
How many moles of gold atoms do 3.45x10^24 gold atoms constitute?
Answer:
3.45E24
Explanation:
calculator I'm not that great at math but I'm good at science but that isn't really science but it's aix between it tho
what components of static electricity theory does Electrostatic Precipitator make use of
Answer:
Electrostatic smoke precipitators work by forcing dirty flue gas (the gas escaping from a smokestack) past two electrodes (electrical terminals), which take the form of metal wires, bars, or plates inside a pipe or smokestack
Explanation:
Which of the following molecules is the least polar?
A) H-H
B) H-CI
C) H-F
D) H-I
Answer: A) H-H is least polar
Explanation:
Electronegativity is defined as the property of an element to attract a shared pair of electron towards itself. The more is the difference in electronegativity, the more polat the bond is.
1. H-H : Electronegativity difference = electronegativity of hydrogen - electronegativity of hydrogen =2.1 -2.1= 0
2. H-Cl : Electronegativity difference = electronegativity of chlorine - electronegativity of hydrogen = 3-2.1 = 0.9
3. H-F : Electronegativity difference = electronegativity of fluorine - electronegativity of hydrogen= 4-2.1= 1.9
4. H-I : Electronegativity difference = electronegativity of iodine - electronegativity of hydrogen= 2.5 -2.1= 0.4
Thus the least electronegativity difference between the bonded atoms is in H-H , this is least polar.
What is the anion formula in sodium carbonate?
HCO3-
Sodium bicarbonate (IUPAC name: sodium hydrogen carbonate), is commonly known as baking soda or bicarbonate of soda, is a chemical compound with the formula NaHCO3. It is a salt composed of a sodium cation (Na+) and a bicarbonate anion (HCO3−). Sodium bicarbonate is a white solid that is crystalline, but often appears as a fine powder.
explanation and answer and you’ll get brain list
Answer:
Option B.
Explanation:
2Pb(NO₃)₂ → 2PbO + 4NO₂ + O₂First we convert 9.90 g of Pb(NO₃)₂ into moles, using its molar mass:
9.90 g ÷ 331.2 g/mol = 0.0299 mol Pb(NO₃)₂Then we convert moles of Pb(NO₃)₂ into moles of PbO, using the stoichiometric coefficients:
0.0299 mol Pb(NO₃)₂ * [tex]\frac{2molPbO}{2molPb(NO_3)_2}[/tex] = 0.0299 mol PbONow we convert 0.0299 mol PbO into grams, using its molar mass:
0.0299 mol PbO * 223.2 g/mol = 6.67 g PbOSo 6.67 g is the theoretical yield. With that in mind we calculate the percent yield:
% yield = 5.51 / 6.67 * 100 % = 82.6%So the correct answer is option B.
Which of the following is an empirical formula ?
Answer:
Explanation:
In any empirical formula problem you must first find the mass % of the elements in the compound. ...
Then change the % to grams. ...
Next, divide all the masses by their respective molar masses. ...
Pick the smallest answer of moles and divide all figures by that.
Since our answer for magnesium is not close enough to round to the nearest whole number we must choose a factor to multiply all the figures by that will yield us whole numbers
Lastly, the coefficients calculated in the previous step will become the subscripts in the chemical formula.
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At a research lab, a scientist carelessly pours cultures of living microbes down the drain. Which type of pollution is this?
Question 4 options:
toxic
sediment
nutrient
bacterial
A scientist that carelessly pours cultures of living microbes down the drain represents a type of bacterial pollution.
What is bacterial pollution?Bacterial pollution refers to the uncontrolled proliferation of bacteria in the surrounding environment and ecosystems.
Bacterial pollution can be a subject of concern because bacteria may be pathogenic microorganisms.Bacterial pollution may cause serious harm to the public health and the well-being of a population.In conclusion, a scientist that carelessly pours cultures of living microbes down the drain represents a type of bacterial pollution.
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