Given the data from the question, the mass of arsenic that contains 1.23×10²⁰ atoms is 0.0153 g
Avogadro's hypothesis6.02×10²³ atoms = 1 mole of arsenic
But
1 mole of arsenic = 75 g
Thus, we can say that:
6.02×10²³ atoms = 75 g of arsenic
How to determine the mass that contains 1.23×10²⁰ atoms6.02×10²³ atoms = 75 g of arsenic
Therefore,
1.23×10²⁰ atoms = (1.23×10²⁰ × 75) / 6.02×10²³ atoms)
1.23×10²⁰ atoms = 0.0153 g of arsenic
Thus, 1.23×10²⁰ atoms is present in 0.0153 g of arsenic
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Which is true of magnetic fields?
A.
They are strongest at each pole, where the field lines are closest together.
B.
They are strongest at the north pole, where the field lines are closest together.
C.
They are strongest at the center of the magnet, where the field lines are farthest apart.
D.
They are strongest at each pole, where the field lines are farthest apart.
Magnetic lines of force are are strongest at each pole, where the field lines are closest together.
What are magnetic fields?A magnetic field is the region around a magnet where the influence of the magnet can be felt. The magnetic line of force show the intensity as well as the direction of the magnetic field.
The fact that is true for all magnetic fields is that they are strongest at each pole, where the field lines are closest together.
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Fe(NO3)3
Percent composition
Answer:
Fe: 23.1%
N: 17.4%
O: 59.5%
Explanation:
You take the grams that each weigh on the periodic table and add it all up. Afterward you create fractions of each over the whole. (Example: Fe/Fe+N+O) then you divide and turn that decimal into a percentage.
Explain how energy is conserved in combustion reactions.
Answer:
That’s because of the law of conservation of energy, which states that: Energy cannot be created or destroyed.
Explanation:
Energy may change form during a chemical reaction. For example, energy may change from chemical energy to heat energy when gas burns in a furnace. The exact amount of energy remains after the reaction as before.
How many grams of Cl are in 515 g CaCl2 ? mass:
The explanation is in the picture
Mention the direct consequence of the following factors on the chemical behaviour of
transition elements:
1) Transition elements can lose as well as accept electrons and exhibit a variety of oxidation
states.
The transition metals can form a variety of complexes because can lose as well as accept electrons .
What are transition elements?The transition elements are those elements that are foud at the middle part of the periodic table having incompletely filled d orbitals.
These elements have a variable oxidation state. They can loose and accept electrons easily and this is why transition metal elements can form a variety of complexes with different colors and other properties.
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Predict the organic product or products for the reaction shown.
The organic product for the reaction given in the image is:
"Quaternary ammonium hydroxide". This process is referred to as Hofmann's elimination.
What is Hofmann's elimination?
The chemical process of creating tertiary amines and alkenes using the treatment of quaternary ammonium with excess methyl iodide, that is, (CH₃)₂ NH, as well as...
the treatment of the resulting compound with a mixture of heat, silver oxide (that is Ag₂O (aq)), and water is what is referred to as Hoffmann's Elimination process.
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Question
How does physical states of a pharmaceutical dosage
form
(Solid,liquid or gas) influence the overall stability and
Storage of the formulated pharmaceutical
product
Answer:
it,s is so many people do you want to go then
you are not study then stage change of it
Find the grams in 6.25 moles of HC2H302.
use this formula m=n×M
Your n would be 6.25mols
Your Molar mass would be the number you get after adding the molar mass of your equation: HC2H302. Find your periodic table and look there.
And you plug in the molar number in the formula and you multiply n×M
I would help but I don't have the periodic table with me right now
A patient who is scheduled for an x-ray expresses concerns about being exposed to radiation because he witnessed the effects of radiation on his father, who died of cancer. How should the dental assistant respond to this patient’s concerns?
The dental assistant should respond to this patient’s concerns by telling him that the amount of x-ray is very minimal and can't cause any negative effect.
What is X-ray?This is a penetrating form of electromagnetic radiation which produces images of the structures inside your body.
Exposure to large amounts of radiation could increase risk of cancer which is why minimal amounts which is safe is adopted.
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Which compound is an alcohol?
CH3Br
CH4
CH3COCH3
CH3CH2OH
Answer:
[tex]ch3ch2oh \: is \: alcohol \\ because \: it \: havve \: an \: oh \: grp \: \\ thank \: you[/tex]
how can the ph of antiacid table de determine in laboratory
Answer:
Antacids are bases that react stoichiometrically with acid. The number of moles of acid that can be neutralized by a single tablet of a commercial antacid will be determined by back titration.
Correct me if i'm wrong, Hope This helps
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an industry is found to be discharging 20ib per day of benzene into a river with a flow of 10billion gallon per day. what will be the resulting benzene concentration, if the benzene is uniformly mixed with river flow
Answer:
Explanation:
bullet A layer of benzene (n = 1.50)2.60cm deep floats on water (n = 1.33) that is 6.50 cm deep. What is the apparent distance from the upper benzene surface to the bottom of the water laver when it is viewed at normal incidence?
Complete the balanced dissociation equation , help please!
Answer:
Al3Br1 -> Al1Br3
Explanation:
I believe you just swap it but I’m not 100%
How would Bohr model show the protons in a carbon atom
Answer:
The Bohr model show the protons in a carbon atom using the model; "Electrons move in fixed orbits around a nucleus of protons and neutrons."
According to Bohr's model of the atoms, the Rutherford model is basically correct. This implies that Bohr model accepts the idea of a nucleus containing nucleons(protons and neutrons).
In addition, the model also postulates that electrons are found in fixed orbits. These fixed orbits are called energy levels or shells.
A graphic description of this is shown in the image attached to this answer.
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Explanation:
Find the mole fraction of Methanol CH3OH and water in a solution prepared by dissolving 4.5 g of alcohol in 40 g of H2O.
Consider the structure shown.
A central S atom is bonded to three O atoms, two through a single line and one through two lines. There are six dots around two of the O atoms and 4 dots around the third O atom.
Determine the number of shared and unshared electrons in the structure.
shared (bonding) electrons:
unshared (lone, nonbonding) electrons:
Determine the number of shared and unshared pairs of electrons in the structure.
shared (bonding) pairs of electrons:
unshared (lone, nonbonding) pairs of electrons:
Determine the total number of valence electrons in the structure.
total valence electrons:
There are eight lone pairs and four bond pairs of electrons in the SO3 molecule. The valence electrons are found on the valence shell of the molecule.
Lewis structure of SO3The molecule SO3 is represented by the Lewis structure shown in the image attached to this answer. The central atom in the molecule is sulfur.
There are sixteen non bonding electrons in the molecule and eight bonding electrons in the molecule Hence, we have eight lone pairs and four bond pairs of electrons in the molecule as shown in the Lewis structure.
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Which of the following is the primary use of land in the United States?
Question 1 options:
Pasture/range
Forest
Cropland
Urban
Answer:
pasture/range
Explanation:
this is because more than 1/3 of the country's land is being used for this mean alone.
Answer: Forest
Explanation: The largest percentage of land use in the United States is for forests.
How does increasing the temperature change the physical properties of an object?
1. Increasing the temperature causes chemical reactions to occur
2. Increasing the temperature changes the kinetic energy of the particles of a material
3. Increasing the temperature causes changes in electric fields
4. Increasing the temperature causes the material to become a new compound
Increasing the temperature change the physical properties of an object through the following:
Increasing the temperature causes chemical reactions to occur.Increasing the temperature changes the kinetic energy of the particles of a material.Increasing the temperature causes changes in electric fields.What is Temperature?This can be defined as the degree of hotness or coldness of a substance and it influences some physical properties.
The properties affected are listed above which makes options 1,2 and 3 the most appropriate choice.
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Which statement is true of all proteins? (1 point)
They are created by mutations in DNA.
They carry oxygen in human blood.
Their main function is to cause mutations.
Their structure is related to their function.
Answer:
Their structure is related to their function.
Explanation:
Protein structure is related to their function. Therefore, the correct option is option D among all the given options.
What is protein?Proteins are huge biomolecular and macromolecular structures made up of one or even more long amino acid residue chains. Proteins serve a wide range of roles inside animals, including catalyzing metabolic events, DNA replication, reacting to stimuli, provides support to organisms and cells including transporting chemicals.
Proteins differ largely in their amino acid sequence, which is determined by the genetic code from their genes and generally culminates with protein folding into such a particular 3D structure that dictates its function. Protein structure is related to their function.
Therefore, the correct option is option D.
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PROBLEM SOLVING: Show pertinent solution and underline/put in a box your final answer. Use the space provided. 15 pts
1. Balance the ff skeleton reactions and identify the oxidizing and reducing agents: 6 pts
a) O2(g) + NO(g) + H2O(l) → NO3-(aq) + H+(aq)
b) CrO42–(aq) + H2O(l) + Cu(s) → Cr(OH)3(s) + Cu(OH)2(s) + OH–(aq)
2. A cell can be prepared from copper and tin. What is the E°cell for the cell that forms from the
following half-reactions? 3 pts
Cu2+(aq) + 2e- Cu(s); E° = 0.34 V Sn4+(aq) + 2e- Sn2+(aq); E° = 0.13 V
Based on the redox equations;
O2 is the oxidizing agent while NO is the reducing agentCu is the reducing agent while CrO_4{^2} is the oxidizing agentThe emf of the cell, E°cell of the cells formed from the half-reactions is 0.21 V
What are reducing and oxidizing agents?Reducing agents are substances which donates electrons and are oxidized in a redox reaction.
Oxidizing agents are substances which accept electrons and are reduced in a redox reaction.
From the given the redox equations:
a) O_2(g) + NO(g) + H_2O(l) → NO_3^{-}(aq) + H^{+}(aq)
O_2 is the oxidizing agent while NO is the reducing agent.b) CrO_4^{2-}(aq) + H_2O(l) + Cu(s) → Cr(OH)_3(s) + Cu(OH)_2(s) + OH^{-}(aq)
Cu is the reducing agent while CrO_4^{2-} is the oxidizing agent.2. The emf of the cell, E°cell = E°red - E°oxi
In the cell, copper is reduced while tin is oxidized.
E°cell = (0.34 - 0.13) V
E°cell = 0.21 V
Therefore, the emf of the cell, E°cell is 0.21 V
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I2 is produced by the reaction of 0.4235 mol of CuCl2 according to the following equation: 2CuCl2+4KI⟶2CuI+4KCl+I2. What volume of I2 gas is produced at STP?
Answer: 4.7432 L
Explanation:
Use stoichiometry: .4235 mol CuCl2 (1 mol I2 / 2 mol CuCl2)(22.4 L / 1 mol I2) = 4.7432 L :)
(2) 8.1.3 Write down the structural formula of alcohol used in this reaction.
Answer:
-OH
Explanation:
Alcohols generally have the structural formula OH
for example, ethanols structural formula is C2H5OH
precipitate the reactants in achemical reaction. II. TRUE or FALSE. Write TRUE if the statement is correct and FALSE if it is not.
21. Sugar is very soluble in a nonpolar liquid like mineral oil.
22. Acetone has a higher vapour pressure than ethanol.
23. In a water molecule, the hydrogen is partially positive, while the oxygen is partially negative.
24. The stability of the DNA structure arises from the H-bonding of base pairs.
25. Components of electronic devices include nonpolar substanceslike transient suppression diodes, metalloids and semimetals.
26. Vapour pressure rises as the strength of IMFA decreases.
27. Boiling point, melting point, viscosity ang surface tension increases as the strength of IMFA decreases.
28. lon-dipole interaction exists between ions and a nonpolar compound. 29. Hydrogen bonding occurs with polar molecules bonded with highly- electronegative atoms.
30. Water is a polar molecule, thus it is miscible with nonpolarmolecule like oil.
Answer:
FalseTrueTrueFalseFalseTrueFalseTrueTrueTrueExplanation:
Sucrose is a polar carbohydrate. The negative and positive regions on the polar sucrose molecules are attracted by the polar water molecules, causing sucrose to dissolve in water. A polar substance like sucrose cannot be dissolved by a nonpolar substance like mineral oil.Because hydrogen bonding gives ethanol a stronger intermolecular force than acetone, ethanol has a higher boiling point than acetone. Because vapor pressure is proportional to boiling point in an indirect manner, acetone has a higher vapor pressure at 25° than ethanol.The Ostart text, O, end text atom hogs electrons and keeps them away from the Hstart text, H, end text atoms because oxygen is more electronegative (electron-hungry). This results in a partial negative charge on the oxygen end of the water molecule and a partial positive charge on the hydrogen end.The stability of DNA double-helical structures is aided by aromatic stacking and hydrogen bonding between nucleobases, which are two of the most important interactions. Hydrogen bonds are noncovalent interactions that are weak, yet the enormous number of hydrogen bonds between complementary base pairs in a DNA double helix combine to endow the structure with a lot of stability.'Boron, silicon, germanium, arsenic, antimony, and tellurium are metalloids. These elements resemble metals but do not conduct electricity as effectively as metals, making them semiconductors.The strength of a liquid's intermolecular forces determines its vapor pressure. The vapor pressure of a liquid with weak intermolecular interactions is higher. The vapor pressure of a liquid with higher intermolecular interactions is lower than that of a liquid with less intermolecular forces.The stronger the IMFs, the lower the vapor pressure of the substance and the higher the boiling point.When an ion interacts with a non-polar molecule, it causes an ion-induced dipole force. The charge of the ion produces a distortion of the electron cloud in the non-polar molecule, generating a brief partial charge, similar to a dipole-induced dipole force.water is a polar solvent and it will dissolve salts and other polar molecules, but not non-polar molecules like oil.Where are the most greenhouse gases generated during the production of electricity?
Answer: city w
Explanation:
cities w,y,z all use renewable energy (sun, water, wind) which offput any greenhouse emmissions,
city w uses coal which produces greenhouse gases when used (burnt).
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Are two atoms of the same element identical?
Answer:
No. They typically are not identical.
Explanation:
Atom's electrons can be in different states
Answer:
NO
Explanation:
Atoms are like dna and cells they all have a different job even if they are the same element
PLease help me find someone who knows the answer and thank you so much I might give you brainliest if it is correct
Answer: because the hot water molecules are moving faster
Explanation: hot water=faster molecules= it spreads faster
1. The molecule of Aspirin C_{9}*H_{8} * O_{4} contains 9C atomsatoms, and 4 Oxygen atomsHow are we using the molecular formula to write a conversion factor and use them in the calculation of the weight of compounds ?
The mass can be obtained from the molar mass when the number of moles is known.
What is molecular formular?The molecular formlar is the formula of the compound that shows the number of atoms of each element that is present in the molecule. Asprin is a moecule that has the molecular formula C9H8O4.
To use the molecular formula to determine weight, we have to know the number of moles involved.
Mass = number of moles * molar mass.
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Complete this example: A 0.67 molal solution was
made by dissolving glucose in water. The boiling
point of pure water is 100.00°C. The boiling point
constant for water is 0.51°C kg/mol.
on
the
Set up the problem.
• 4T2 = (0.51°C•kg/mole)(0.67 m)
of
• What is the 473 value?
vc
• What is the boiling point for the glucose
solution?
УРС
Answer:
A then C
Explanation:
Answer:
a,c
Explanation:
A sample of 85.5 g of tetraphosphorous decoxide (P4O10) reacts with 74.9 g of water to produce phosphoric acid (H3PO4) according to the following balanced equation.
P4O10+6H2O⟶4H3PO4
Determine the limiting reactant for the reaction.
H2O
H3PO4
P4O10
Calculate the mass of H3PO4 produced in the reaction.
mass of H3PO4:
g
Calculate the percent yield of H3PO4 if 39.2 g of H3PO4 is isolated after carrying out the reaction.
percent yield:
%
The limiting reactant here is P4O10 . The percent yield of the product is caculated as 33.3%.
What is the limiting reactant?The limiting reactant is the reactant that is in a minute quantity.
Number of moles of P4O10 = 85.5 g/284 g/mol = 0.3 moles
Number of moles of H2O = 74.9 g / 18 g/mol = 4.2 moles
From the reaction equation;
1 mole of P4O10 reacts with 6 moles of H2O
x moles of P4O10 reacts with 4.2 moles of H2O
x = 0.7 moles
Hence, P4O10 is the limiting reactant.
1 mole of P4O10 yields 4 moles of H3PO4
0.3 moles of P4O10 yields
0.3 moles * 4/1 = 1.2 moles
Mass of the H3PO4 = 1.2 moles * 98 g/mol = 117.6 g
Percent yield = 39.2 g/117.6 g * 100/1 = 33.3 %
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Use the process of photosynthesis and cellular respiration to describe why the drought has driven the bears into the towns.
The process of photosynthesis and cellular respiration is usually at the barest minimum when drought occurs.
What is Photosynthesis?This is the process in which green plants manufacture their food through the presence of light energy from the Sun.
During drought, there is no water which reduces photosynthetic activity of plants. This leads to shortage of food thereby making bears to come into town in search of food.
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