The correct phrase that describes an atom is option 4. a positively charged nucleus surrounded by negatively charged electrons.
What is an atom ?Atoms are the basic units of every substance in the universe. Atoms are composed of subatomic particles electrons, protons and neutrons. The core of an atom is called the nucleus.
The positively charged protons and neutral particles neutrons are located inside the nucleus. The negatively charged electrons are revolving around the nucleus.
The electrons experience an electrostatic attraction from the protons and the nuclear pull from the center which keeps it surrounding the atom. hence option 4 is correct.
Find more on atoms:
https://brainly.com/question/13654549
#SPJ1
a balloon contains 0.5 l of air at 101.5 kpa. you squeeze it to a volume of 0.25 l. what is the pressure of air inside the balloon? responses 0.25 kpa 0.25 kilopascal 50.8 kpa 50.8 kilopascal 102 kpa 102 kilopascal 203 kpa
The pressure of air inside the balloon is 203 kPa. This is because the pressure of a gas is directly proportional to its volume.
What is directly proportional?Directly proportional is a mathematical term used to describe a linear relationship between two variables, where a change in one variable is directly reflected by a proportional change in the other variable. For example, if the number of hours a person works increases, the amount of money they earn will also increase proportionally. This linear relationship is also known as a "direct relationship" or a "direct variation".
Since you have halved the volume of the balloon, the pressure has doubled. The initial pressure of 101.5 kPa multiplied by 2 equals 203 kPa.
To learn more about directly proportional
https://brainly.com/question/28837405
#SPJ4
Kindly answer please.
Answer:
Explanation:
To calculate the enthalpy change for the reaction between zinc (Zn) and copper sulfate (CuSO4), we will use the method of calorimetry. This method involves measuring the heat absorbed or released by a reaction and using this information to calculate the enthalpy change of the reaction.
The method for calculating the enthalpy change for this reaction is as follows:
Obtain a calorimeter, such as a bomb calorimeter or a coffee cup calorimeter, and ensure that it is properly insulated to prevent heat loss.
Measure out a known volume of 1 M copper sulfate solution, and carefully add an excess of zinc powder to the solution. Be sure to measure the initial temperature of the solution before the reaction.
Start the reaction by mixing the zinc and copper sulfate together, and monitor the temperature of the solution as the reaction proceeds. Record the final temperature of the solution after the reaction has reached equilibrium.
Use the heat capacity of the calorimeter (Ccal) and the change in temperature (ΔT) to calculate the heat absorbed or released by the reaction. The heat absorbed or released by the reaction can be calculated using the formula: q = Ccal x ΔT
Once you have the heat absorbed or released by the reaction, you can use the molar enthalpy of the reaction (ΔH) to calculate the enthalpy change of the reaction. ΔH = q/ n
where n is the number of moles of Zn that reacted.
Repeat the experiment several times to confirm the results.
It's important to note that to get a precise result, the solution should be well mixed, the reaction should be carried out at constant pressure, and the heat loss should be minimized by using an insulated container.
Also, it's important to check the zinc powder and copper sulfate are not contaminated with other materials that could affect the result.
calculate the ph of a 0.10 m solution of hypochlorous acid, hocl. ka of hocl is 3.5×10−8.
The pH of a 0.10 M solution of hypochlorous acid is approximately 3.7348.
The pH of an acid solution can be calculated using the relationship between the acid dissociation constant (KA) and the acid concentration (HA).
The acid dissociation constant (KA) of hypochlorous acid (HOCl) is 3.5 × 10^-8.
The acid dissociation equation for HOCl is:
HOCl + H2O <--> H3O+ + Cl-
So, the equilibrium constant expression is:
KA = [H3O+][Cl-] / [HOCl]
Given that the concentration of the acid is 0.1 M, we can use the following equation to calculate the hydronium ion concentration:
[H3O+]^2 = KA * [HOCl]
Plug in the value of KA and [HOCl]
[H3O+]^2 = (3.5*10^-8)(0.1)
[H3O+] = sqrt(3.510^-80.1)
[H3O+] = 1.87*10^-4
The pH of a solution is defined as the negative logarithm of the hydronium ion concentration
pH = - log[H3O+] = - log(1.87*10^-4) = 3.7348
So, the pH of a 0.10 M solution of hypochlorous acid is approximately 3.7348.
To learn more about problems with hypochlorous acid:
https://brainly.com/question/15243465
#SPJ4
bactroban ointment contains 2% mupirocin. how many grams of a polyethylene glycol ointment base must be mixed with the contents of a 44-g tube of the bactroban ointment to prepare one having a concentration of 5mg/g
The components of a 44-g tube must be combined with 132 g of something like a polyethylene glycol active substance.
Describe Polyethylene.The most popular plastic there in world is polyethylene (PE), which belongs to the significant polyolefin resin family. They are created using ethylene catalytic polymerization [11]. It is a viscoelastic polymer made up of numerous long chains that are combined from ethylene-based monomer units.
What is polyethylene used for?The main applications include squeeze bottles, household goods, agricultural mulch, garbage and grocery bags, wire or cable insulator, package film, and trash and retail bags.
44 x 0.02 = 0.88 g
y = no. of g base
5 mg = 5 / 1000
= 1 / 200
0.88 / (y + 44) = 1/200
88 / 100 = (y + 44) / 200
88 = (y + 44) / 2
176 = y + 44
y = 132 g
To know more about polyethylene visit:
https://brainly.com/question/14553941
#SPJ4
Crystals are 3 dimensional arrays of positive and negative ions in a _____ pattern
Crystals are 3-dimensional arrays of positive and negative ions in a repeating pattern.
The symmetrical, three-dimensional structural configuration of points representing atoms, ions, or molecules that make up a crystalline material is known as the crystal lattice. It can be characterized as the spatial geometrical arrangement of the atoms, ions, or molecules that make up the crystalline solid. Three-dimensional shapes, or 3D shapes, are solid shapes with length, depth, and width. These are forms that take up room. This indicates that we can reach out and touch them. An "array of arrays" that stores data in tabular form is what is referred to as a multi-dimensional array.
To know more about crystal lattice click here
https://brainly.com/question/10281663
#SPJ4
a 600. ml beaker has an inner diameter of 73.0 mm. what is the vertical distance between the 100. ml marks on the side of the beaker? give your answer in cm.
There are 2.15 cm between each 100 mL mark. The formula; is used to determine a cylinder's molarity volume. V = πr^2h.
What is the straightforward meaning of molarity?The number of moles of a solute per liter of a solution is known as molarity. The molar concentration of a solution is another name for molarity.
What in chemistry is molality?The term "total moles of a solute contained in a kilogram of a solvent" is used to describe molality. Molal concentration is another name for molality. It gauges the amount of solute in a solution.
to know more about molarity visit:
https://brainly.com/question/8732513
#SPJ4
On the polyprotic weak acid/strong base titration curve below, label the following points. a) The point where the pH corresponds to a solution of H2A in water. b) The point where the pH corresponds to a solution of HA in water c) The point where the pH corresponds to a solution of A n water. d) The point where pH EpKa1. e) The point where pH pka2 mL of titrant
Point A: This is the point where the pH corresponds to a solution of H2A in water. At this point, the solution is mainly composed of undissociated H2A molecules, so the pH of the solution is equal to the pKa1 of the acid.
What is solution?Solution can be defined as a method for solving a problem, dispute, or difficult situation. It is a way to overcome obstacles and find a positive outcome.
b) Point B: This is the point where the pH corresponds to a solution of HA in water. At this point, the solution is mainly composed of partially dissociated HA molecules, so the pH of the solution is equal to the pKa1 of the acid.
c) Point C: This is the point where the pH corresponds to a solution of A in water. At this point, the solution is mainly composed of fully dissociated A molecules, so the pH of the solution is equal to the pKa2 of the acid.
d) Point D: This is the point where the pH corresponds to the pKa1 of the acid. At this point, the solution is in equilibrium between the undissociated H2A molecules and the partially dissociated HA molecules, so the pH of the solution is equal to the pKa1 of the acid.
e) Point E: This is the point where the pH corresponds to the pKa2 of the acid. At this point, the solution is in equilibrium between the partially dissociated HA molecules and the fully dissociated A molecules, so the pH of the solution is equal to the pKa2 of the acid. This point is reached when the total volume of titrant added is equal to the total volume of acid, which is usually equal to the second pKa of the acid times the volume of the acid.
To learn more about solution
https://brainly.com/question/28564792
#SPJ4
How many protons, neutrons and electrons are there in a neutral atom of the isotope represented by: ^79_35 Br protons: neutrons: electrons:
A neutral atom of the isotope represented by ^79_35 Br contains protons, neutrons, and electrons:
protons=35
neutrons=44
electrons=34
What is isotope?Isotopes are two or more different atom types that have the same atomic number and position in the periodic table but different nucleon numbers due to the number of neutrons in their nuclei. Atoms that have different numbers of neutrons but the same number of protons are called isotopes. Despite having nearly identical chemical properties, their different masses have an impact on their physical characteristics. Atoms that belong to the same element and have the same atomic number Z but a different mass number A are known as isotopes. Carbon-12, carbon-13, and carbon-14 are three isotopes of the element with respective masses of 12, 13, and 14.
Here,
The number of protons = 35
The number of neutrons =79-35=44
The number of electrons = 35-1 =34
The protons, neutrons and electrons are there in a neutral atom of the isotope represented by ^79_35 Br:
protons=35
neutrons=44
electrons=34
To know more about isotope,
https://brainly.com/question/10757396
#SPJ4
How many grams of fluorine gas can be produced from 3.50 moles of NaF?
Mole measure the number of elementary entities of a given substance that are present in a given sample. Therefore, 70.035 grams of fluorine gas can be produced from 3.50 moles of NaF.
What is mole?The SI unit of amount of substance in chemistry is mole. The mole is used to measure the quantity or amount of substance. We know one mole of any element contains 6.022×10²³ atoms which is also called Avogadro number.
Mathematically,
number of moles of molecule=given mass of molecule÷ molar mass of molecule
The balanced equation for the chemical reaction can be written as
NaF + H[tex]_2[/tex]SO[tex]_4[/tex] → NaHSO[tex]_4[/tex]+ F[tex]_2[/tex]
1 mole of NaF produce 1 mole of F[tex]_2[/tex].
3.50 moles =moles of NaF
3.50 moles =moles of F[tex]_2[/tex]
3.50 moles x 20.01 g/mol = 70.035 grams of fluorine gas
Therefore, 70.035 grams of fluorine gas can be produced from 3.50 moles of NaF.
To know more about mole, here:
https://brainly.com/question/15209553
#SPJ2
A chemit in an imaginary univere doe an experiment that attempt to correlate the ize of an atom with it chemical reactivity. The reult are tabulated a follow
The reactivity of a chemical is proportional to its atomic size. An experiment that attempts to correlate the size of an atom with its chemical reactivity.
How is chemistry relevant outside of the chemistry lab and how is it connected to daily life?We use chemistry frequently in our daily lives. The food we eat, the air we breathe, and the different cleaning products we use are just a few examples of how one can easily observe this branch of science in different spheres of human life. In fact, it is so prevalent that sometimes even human emotions are the result of chemical reactions within our bodies.
How is chemical reactivity impacted?The four primary variables that influence the reaction rate are reactant concentration, the physical state of the reactants, surface area, temperature, and the presence of a catalyst.
What modifies the reactivity?Across a period, responsiveness declines as you move from left to right. Higher reactivity results from simpler electron transfer or removal as you move further to the left and down the periodic chart.
To know more about chemical reaction visit:
https://brainly.com/question/11231920
#SPJ4
PLS HELP USING ALL MY POINTS AND WILL MARK BRAINLIEST
1. Fill in table 5.2
2. Which metal is the most reactive? How do you know this?
3. Rank the metals in order of increasing reactivity
4. Give the chemical equations for each single replacement reaction that took place
5. Was Fe^3+ reduced? If so, what metal(s) acted as reducing agents?
Answer:
54.09
Explanation:
Based on your answer to Part B, what is the average rate of formation of HF? Express your answer to three decimal places and include the appropriate units.
For the general reaction a A+B , relative rates are expressed as follows: where B) is the concentration of substance B, A) is the concentration of substance A, and t is the time. The lowercase letters a and b stand for the coefficients of A and B in the chemical equation, respectively. The greek symbol A (delta) means "change in."
The average rate of hydrogen fluoride generation, as determined by your response to Part B, is rate = 1.12 10(4) M/s.
Why does hydrogen fluoride corrode so badly?corrosive due to the acid's H+ ions and poisonous due to the fluoride ions F-, which can penetrate deeply, chelate calcium and magnesium, and thus upset biological balances due to the destruction of the skin's or an eye's outermost layer.
A strong or weak acid, is HF?Hydrofluoric acid, sometimes known as HF, is a weak acid. HF is a powerful corrosive, yet it isn't a strong acid. Since H and F have a very tight link, HF doesn't dissociate very much in water.
To know more about hydrogen fluoride visit:
https://brainly.com/question/27802323
#SPJ4
Your answers to Part B led you to the conclusion that the overall return of hydrogen fluoride creation is speed = 1.12 10(4) M/s.
Why corrodes hydrogen fluoride so severely?Caustic because of the anticholinergic H+ ions and dangerous because of the fe(iii F-, which may penetrate profoundly, combine calcium and magnesium and alter biological balances by ruining the skin's or even an eye's outer layer.
Is HF a high or low acid?The acid hydrofluoric acid, sometimes referred to as HF, is weak. Although HF is a potent acidic, it is not a strong acid. HF is does not disintegrate a great deal in water because H and E have an extremely strong bond.
To know more about hydrogen fluoride visit:
brainly.com/question/27802323
#SPJ4
an unknown element is determined to have two naturally occurring isotopes. isotope 1 is 64.11% abundant and has a mass of 68.925580 u, and isotope 2 has a mass of 70.9247005 u. determine the atomic mass of the unknown element. express your answer to four significant figures.
an unknown element is determined to have two naturally occurring isotopes. isotope 1 is 64.11% abundant and has a mass of 68.925580 u, and isotope 2 has a mass of 70.9247005 u, the atomic mass of the unknown element is 69.64 u.
What is percentage abundant?The proportion of a given element's all-natural isotopes is known as its percent abundance. An element's relative abundance is its frequency in the environment as compared to all other elements, expressed as a percentage. The quantity of isotopes and their relative abundances are all that are required to determine an element's atomic weight, as was previously said.
Given that,
isotope 1 is 64.11% abundant (X₁)
isotope 2 percentage abundant is (X₂) = (100 - 64.11) = 35.89
Mass of isotope (M₁) = 68.925580 u
Mass of another isotope (M₂) = 70.9247005 u
atomic mass of the unknown element = (M₁ X₁ + M₂ X₂) / 100%
M = (68.925580 × 64.11) + (70.9247005 × 35.89) / 100%
M = 69.64
To know more about isotope refer to:
https://brainly.com/question/14220416
#SPJ4
which sentence describes one characteristic of nonmetals? responses nonmetals are often brittle solids. nonmetals are often brittle solids. nonmetals often conduct electricity. nonmetals often conduct electricity. nonmetals are often malleable. nonmetals are often malleable. nonmetals are often ductile. nonmetals are often ductile.
The sentence which describes one characteristic of nonmetals is nonmetals are brittle and ductile in nature.
Non-metals are those which warrant all the metallic attributes. They're good insulators of heat and electricity. They're substantially feasts and occasionally liquid. Some of also are indeed solid at room temperature like Carbon, Sulphur and phosphorus.
Brittleness describes the property of a material that fractures when subordinated to stress but has a little tendency to distort before rupture. Brittle accoutrements are characterized by little distortion, poor capacity to repel impact and vibration of cargo, high compressive strength, and low tensile strength.
A material's capability to suffer significant plastic distortion under tensile stress before rhapsody is called the ductile parcels of the material. The ductile accoutrements are nickel, etc.
Learn more about ductile visit:
brainly.com/question/29961125
#SPJ4
2. why did the addition of potassium thiocyanate cause the equilibrium to shift the way it did? (which ion caused this shift?) 3. a. which way did the equilibrium shift when excess potassium chloride was added to the test solution? b. why did the addition of potassium chloride cause the equilibrium shift since neither potassium nor chloride ions are common ions to this equilibrium?
Increase in the concentration of K+ ions causes the equilibrium to shift backwards and the concentration of K+ ions increases when potassium chloride is added to the red solution.
How does the above reaction's equilibrium change as KSCN is added?Increases with the addition of KSCN(aq) forward reactants include SCN-. systems move away from additions, therefore when there are more SCN- present, the system moves forward to restore balance. furthermore SCN-, Q, and K. Therefore, Q must rise to equal K in order to restore equilibrium.
When concentration is changed, what happens to equilibrium?a)The addition of excess potassium chloride (KCl) causes the equilibrium to shift to the left. This is because KCl is a common ion and it competes with Fe3+ for the SCN- ions, thus decreasing the [Fe(SCN)]2+ concentration.
b) The addition of potassium chloride causes the equilibrium to shift to the left because the chloride ions have a similar charge and radius to that of the SCN-, and compete with the SCN- ions for the Fe3+ ions. This means that the increased chloride ions would reduce the amount of [Fe(SCN)]2+ formed.
Learn more about equilibrium here:
brainly.com/question/14017610
#SPJ4
Common ion effect on a chemical system:
Fe3+ (aq) + SCN- (aq) => [Fe(SCN)]2+ (aq)
2. why did the addition of potassium thiocyanate cause the equilibrium to shift the way it did? (which ion caused this shift?)
3. a)which way did the equilibrium shift when excess potassium chloride was added to the test solution?
b) why did the addition of potassium chloride cause the equilibrium shift since neither potassium nor chloride ions are common ions to this equilibrium?
a 500.0 ml sample of gas at a pressure of 70.93 kpa is transferred to a 1050.0 ml vessel at a constant temperature. what is the pressure of the gas in the larger vessel?
The pressure of the gas in the larger vessel when a 500.0 ml sample of gas at a pressure of 70.93 kPa is transferred to a 1050.0 ml vessel at a constant temperature is 33kPa.
Given the volume of sample gas (V1) = 500ml = 0.5L
The pressure of gas (P1) = 70.93kPa
The volume of vessel (V2) = 1050ml = 1.05L
The temperature is kept constant.
Then the pressure of the gas in the larger vessel =P2
We know that from Boyles law PV = nRT
As temperature is kept constant we can say that P1V1 = P2V2
Such that (70.93 x 10^3) x (0.5) = P2 x (1.05)
P2 = 33kPa
Hence the pressure of the gas in the larger vessel is 33kPa.
To learn more about Boyles law click here https://brainly.com/question/1437490
#SPJ4
What is the solubility of M(OH)2 in a 0.202 M solution of M(NO3)2? Ksp = 6.65×10?18 for M(OH)2 Calculate the molar solubility of lead thiocyanate in 0.600 M KSCN.? Ksp=2.00* 10^-5
The solubility of M(OH)2 in a 0.202 M solution of M(NO3)2 is 1.98 x 10-4 mol/L.
For the second question, the molar solubility of lead thiocyanate in 0.600 M KSCN is 3.33 x 10-3 mol/L.
Calculate the ion product (Q) of the solution using the given Ksp:
Q = Ksp = 6.65 x 10-18
Calculate the concentration of M(OH)2 ions in the solution:
[M(OH)2] = √(Q/[M(NO3)2])
[M(OH)2] = √(6.65 x 10-18 / 0.202)
[M(OH)2] = 1.98 x 10-4 mol/L
For the second question, the molar solubility of lead thiocyanate in 0.600 M KSCN is 3.33 x 10-3 mol/L.
Calculate the ion product (Q) of the solution using the given Ksp:
Q = Ksp = 2.00 x 10-5
Calculate the concentration of Pb(SCN)2 ions in the solution:
[Pb(SCN)2] = √(Q/[KSCN])
[Pb(SCN)2] = √(2.00 x 10-5 / 0.600)
[Pb(SCN)2] = 3.33 x 10-3 mol/L
For more questions like Molar solubility click the link below:
https://brainly.com/question/28170449
#SPJ4
question what would happen if the kinetic energy of the reactants was not enough to provide the needed activation energy? responses
If the kinetic energy of the reactants was not enough to provide the needed activation energy then:
Reaction products would reform.
The rate of the response would probably quicken.
The products would develop in an energetically unstable condition.
The complex that had been activated would change into products.
A lower energy state would be used to generate the products.
What is the meant by activation energy?
The least amount of energy necessary to bring atoms or molecules into a state where they may undergo chemical transformation or physical transport is known as the activation energy in chemistry. The difference in energy content between atoms or molecules in an activated or transition-state configuration and the same atoms and molecules in their original configuration is known as the activation energy in transition-state theory.
To learn more about activation energy, click here: -
https://brainly.com/question/28384644
#SPJ4
The atoms in a ____ have a definite volume, but move quickly enough to overcome the forces of attraction between them.A. SolidB.LiquidC.Gas
The atoms in a Liquid have a definite volume, but move quickly enough to overcome the forces of attraction between them.
What is the forces of attraction?Any specific force that pulls two things or particles toward one another is referred to as a force of attraction. The gravitational, electrostatic, and magnetic forces are three such forces that are related to the many concepts and characteristics of the item.Intermolecular force is the force of attraction that unites two atoms or molecules to form a molecule or other substance. In essence, nature is beautiful. It also works between atoms and ions. For matter that is solid, liquid, or gaseous, the intermolecular force differs.London dispersion forces (LDF), dipole-dipole interactions, and hydrogen bonds are the three different intermolecular forces. All substances at least contain LDF, but molecules can have any combination of these three types of intermolecular interactions.Learn more about Force of attraction refer to ;
https://brainly.com/question/3150088
#SPJ4
Consider the following unbalanced equation for the combustion of hexane:αC6H14(g)+βO2(g)→γCO2(g)+δH2O(g)A. Balance the equation.B. Determine how many moles of O2 are required to react completely with 5.2 moles C6H14
4.08 moles of O2 are required to react completely with 5.2 moles C6H14.
What is unbalanced equation?Chemical equations that are out of balance have the number of atoms of each element on the left side of the equation not matching the number of atoms of each element on the right side. Chemical reactions cannot be correctly represented by equations that are not balanced; balanced equations are necessary.
A. To balance the equation, we need to determine the correct coefficients (α, β, γ, δ) for the reactants and products such that the number of atoms of each element is equal on both sides of the equation.
We can see that we need 14 carbon atoms on both sides, 14 hydrogen atoms on both sides, and 6 oxygen atoms on both sides
Balancing the equation:
C6H14(g) + 19/5 O2(g) → 6CO2(g) + 7H2O(g)
B. To determine the moles of O2 required to react completely with 5.2 moles of C6H14, we can use the balanced equation. We know that the ratio of C6H14 to O2 is 1:19/5. Therefore, to react completely with 5.2 moles of C6H14, we need 19/5 * 5.2 moles of O2, which is approximately 4.08 moles of O2.
To know more about unbalanced equation click-
brainly.com/question/22669828
#SPJ4
there are only three naturally occurring amino acids that do not have exactly one chiral center. which are they?
The three naturally occurring amino acids that do not have exactly one chiral centre are Thr, Gly, Ile. Threonine is one of two proteinogenic amino acids with two stereogenic centres, the other being isoleucine, where Gly is the non-essential amino acid glycine is an inhibitory neurotransmitter. Ile refers to isoleucine amino acid.
What is meant by Amino acids?
Amino acids are what proteins are made of. Proteins are made up of lengthy strands of amino acids. Your body contains several different proteins, each of which serves important purposes. A protein's amino acid composition varies from one another. The sequence dictates how the protein will look and work in your body.
To Learn more about amino acids, click here: -
https://brainly.com/question/28409615
#SPJ4
A lab student notified the TA of a SMALL hazardous chemical spill. Under the TA's guidance, the student used the spill kit materials to clean it. Which of the following is NOT the student's responsibility
Following is NOT the student's responsibility : schedule a retraining session on materials handling with the safety coordinator.
What is the responsibility when hazardous chemical spill occurs?It is important to notify your instructor of the chemical spills immediately. You should immediately warn everyone that something has been spilled and never touch, smell or in any other way interact with the chemical before you know what you are dealing with.
If you spill a large amount, make sure you evacuate the lab, and call the emergency personnel. It is important to have spill control and personal protective equipment appropriate for chemicals being handled readily available.
To know more about chemical spill, refer
https://brainly.com/question/29536510
#SPJ4
Note: the question given on portal is incomplete. here is the complete question.
Question: A lab student notified the TA of a SMALL hazardous chemical spill. Under the TA's guidance, the student used the spill kit materials to clean it. Which of the following is NOT the student's responsibility
a) prompt and proper clean-up.
b) to have spill control and personal protective equipment appropriate for the chemicals being handled readily available.
c)schedule a retraining session on materials handling with the safety coordinator.
d)Immediately report the spill to the appropriate emergency response office.
Consider the unbalanced equation for the oxidation of aluminum._Al _O2 Right arrow. _Al2O3Which sequence of coefficients should be placed in the blanks to balance this equation
Answer: 4Al + 3O2 -> 2Al2O3
Explanation:
What I did was:
The product has 3 oxygens while the reactant has 2. So if you multiply the reactant by 3 and the product by 2 then the amount of oxygens on both sides will be equal (both sides have 6)
Then since there are now 4 Al on the product sides after multiplying by 2 for the oxygen (2 Al2 = 4 Al), there must be 4 Al on the reactants side.
what is the chemistry behind monomer liquid and polymer powder nail enhancements, and how does it work?
The chemistry behind monomer liquid and polymer powder nail enhancement is created by combining a chemical known as monomer liquid mixed with polymer powder to form a nail enhancement.
The monomer liquid will be combined with polymer powder to form the sculptured nail. The amount of monomer liquid and polymer powder used to create a bead is called the mix ratio. A mix ratio can be described as dry, medium, or wet. If twice as much liquid as powder is used to create the bead it is called a wet mix. The monomer is a moleculewhich binds to other molecules to form a polymer. This explain the monomer liquid.
To learn more about Monomer liquid please visit:
https://brainly.com/question/6548768
#SPJ4
how is the prevention of an epidemic different from the prevention of a pandemic
Prevention of an epidemic is different from the prevention of a pandemic because the first situation does not involve the spread of the pathogenic agent worldwide.
What is the major difference between a pandemic situation and an epidemic situation?The major difference between a pandemic situation and an epidemic situation is based on the fact that an epidemic is restricted to a certain area while a pandemic encompasses worldwide.
Therefore, with this data, we can see that the major difference between a pandemic situation and an epidemic situation is the length of extension of the invective agent.
Learn more about epidemic situations here:
https://brainly.com/question/24844650
#SPJ1
How many atoms are in 2.54 L oxygen gas, 02?
Answer: 2.94x10^22 atoms of O2
Explanation:
To determine the number of atoms in a given volume of a gas, you need to know the molar volume of the gas and the number of moles of the gas present.
The molar volume of a gas at standard temperature and pressure (STP) is 24.45 L/mol. At STP, the pressure is 1 atm and the temperature is 0°C (273.15 K).
So, to find the number of moles of a gas present in a container, you can use the Ideal Gas Law: PV = nRT.
Where:
P = pressure (atm)
V = volume (L)
n = number of moles
R = ideal gas constant (0.0821 L·atm/mol·K)
T = temperature (K)
So we can rearrange the formula to find n = PV/RT
n = (2.44 atm * 2.54 L) / (0.0821 L·atm/mol·K * 275 K) = 0.049 moles
To find the number of atoms of O2, we just multiply the number of moles by Avogadro's number which is 6.022x10^23 atoms/mol.
So the number of atoms of O2 in 2.54 L at 2.44 atm and 275 K is:
6.022x10^23 atoms/mol * 0.049 moles = 2.94x10^22 atoms of O2
This is the number of atoms of O2 present in the container.
Calculate how many moles is 37g of calcium hydroxide.
Answer:
0.5 mol
Explanation:
37/(40+2+32)=0.5 mol
no amino acid molecule by itself can speed up or catalyze reactions between other molecules; however, when amino acids are joined together to make a protein with catalytic properties, the new structure (enzymatic protein) can speed up the rate of a specific chemical reaction. what does this illustrate? view available hint(s)for part a no amino acid molecule by itself can speed up or catalyze reactions between other molecules; however, when amino acids are joined together to make a protein with catalytic properties, the new structure (enzymatic protein) can speed up the rate of a specific chemical reaction. what does this illustrate? the complexity/simplicity paradox the summation theory energy flow, processing, and utilization emergent properties polymer duality
Emergent characteristics are those traits that develop when smaller pieces come together even though they do not independently possess any of those traits.
What are amino acids?Amino acids are the building blocks of proteins. Life's essential building blocks are proteins and amino acids. Byproducts of the breakdown or digestion of proteins are amino acids. The human body uses amino acids to make proteins that help with food dissection. The amino group and carboxyl-acid group of the fundamental structure are referred to as "amino acids." There are 21 amino acids in proteins, and each one has a distinct R group or side chain.
What is the role of amino acids?The creation of body protein and other vital nitrogen-containing substances like creatine, peptide hormones, and certain neurotransmitters depends on amino acids. The biological need is for amino acids, even though allowances are portrayed as protein.
Emergent properties are characteristics of a set of things, like atoms, buildings, or insects, that you wouldn't find in any of the parts alone.
Although the amino acids are independent molecules, when they work together to form enzymes, they exhibit qualities that they do not individually. This is a classic illustration of emergent features.
To know more about Amino Acid visit:
https://brainly.com/question/28409615
#SPJ4
Given the values of ΔH∘rxn, ΔS∘rxn, and T below, determine ΔSuniv.
A. ΔH∘rxn= 84 kJ , ΔSrxn= 144 J/K , T= 300 K
Express your answer using two significant figures.
ΔSuniv =
Predict whether or not the reaction will be spontaneous.
B. ΔH∘rxn= 84 kJ , ΔSrxn= 144 J/K , T= 751 K
Express your answer using one significant figure.
ΔSuniv =
Predict whether or not the reaction will be spontaneous.
C. ΔH∘rxn= 84 kJ , ΔSrxn=− 144 J/K , T= 300 K
Express your answer using two significant figures.
ΔSuniv =
Predict whether or not the reaction will be spontaneous.
D. ΔH∘rxn=− 84 kJ , ΔSrxn= 144 J/K , T= 406 K
Express your answer using two significant figures.
ΔSuniv =
Predict whether or not the reaction will be spontaneous.
The reaction will be spontaneous value of ΔSuniv = -116 J/K
a) ΔSsurr = -ΔH∘rx/T
ΔSsurr = -84 kJ/ 300 K = 0.28 kJ/K = 28.0 J/K
ΔSuniv = ΔSsyst + ΔSsurr
ΔSuniv = -144J/K + 28.0 J/K = -116 J/K
This will be spontaneous
b) ΔSssur = -84 kJ/ 751 K = 0.1118 kJ/K = 111.8 J/K
ΔSuniv = 144J/K + 111.8 J/K = 255.8 J/K
This is non-spontaneous
c) ΔSssur = - 84 kJ/ 300 K = - 28.0J/K
ΔSuniv = - 144J/K + (-28.0) J/K = - 172 J/K
This will be spontaneous
d) ΔSssur = +84 kJ/ 406 K = 0.2068 kJ/K = 206.8 J/K
ΔSuniv = 144J/K + 206.8 J/K = 350.8 J/K
This will be non-spontaneous
To know more about spontaneous here
https://brainly.com/question/5372689
#SPJ4
what is the net ionic equation that occurs when zinc nitrate and lithium phosphate are mixed together in water? a precipitate of zinc phosphate is formed.
The net ionic equation that occurs when zinc nitrate and lithium phosphate are mixed together in water is 3Zn2+ + 2PO43- ⟶ Zn3(PO4)2(s)
When zinc nitrate and lithium phosphate are combined in water, a precipitate of zinc phosphate is created. It is an insoluble white solid. The compounds that are directly engaged in the chemical reaction are the only ones that are shown in the net ionic equation. Two soluble ionic chemicals are involved in the double replacement reaction.
In an aqueous solution, zinc nitrate, Zn(NO3)2, fully dissociates into zinc cations, Zn2+, and nitrate anions, NO3-.
In an aqueous solution, lithium phosphate (Li3PO4) fully dissociates into lithium cations (Li+) and phosphate anions (PO4)3-.
3Zn2+ + 2PO43- ⟶ Zn3(PO4)2(s)
To learn more about zinc nitrate click here https://brainly.com/question/29355805
#SPJ4
