What is the energy of an electron in the n = 15 energy state?
A.) 4.91 x 10^-16 J
B.) 3.27 x 10^-17 J
C.) -1.45 x 10^-19 J
D.) Zero. The n = 15 energy state doesn't exist.
E.) -9.69 x 10^-21 J
E. The energy of an electron in the n = 15 energy state is determined as -9.6 x 10⁻²¹ J.
Energy of the electron in the n = 15 energy stateThe energy of an electron in the n = 15 energy state is calculated as follows;
E = -13.6/n²
given n = 15
E = -(13.6/15²)
E = -0.06 eV
Energy of the electron in JoulesE = -0.06 x 1.6 x 10⁻¹⁹
E = -9.6 x 10⁻²¹ J
Thus, the energy of an electron in the n = 15 energy state is determined as -9.6 x 10⁻²¹ J.
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Explain why pure iron is malleable
Answer:
Metals are malleable : They can be bent and shaped without breaking. This is because they consist of layers of atoms that can slide over one another when the metal is bent, hammered or pressed.
Explanation:
Pure iron is a bright silvery white metal which oxidizes (rusts) rapidly in moist air or in water containing dissolved oxygen. It is soft, malleable, and ductile, and is strongly magnetic (ferromagnetic).
This problem has to be solved using algor mortis.
3. Approximately how long as the victim been dead if his body temperature was 85.2 F?
Answer:
The victim has been dead for approximately 12 hours.
Explanation:
Algor mortis, or the cooling of the body after death, is a reliable way to estimate time of death. The average body temperature is 98.6 degrees Fahrenheit, so 85.2 degrees Fahrenheit would be 12 hours after death.
state the types of matter
Answer:
they're
Explanation:
solid, liquid and gas
Based on your reading you know that one elements on the periodic table are listed in order of their atomic numbers. If scientists didn't use that method, hypothesize another wav the periodic table could be organized in an orderly fashion. Write your answer below.
CAN YOU HELP ME RIGHT NOW PLEASE, THANKS YOU
An alternative method for the arrangement of elements is by the use of atomic masses of the elements.
What is the periodic table?The periodic table is an arrangement of elements based on increasing atomic number. This is what is called the modern periodic law. Before the advent of the current periodic table, there have been many other kinds of periodic table.
In the periodic table as it is now, there are about 118 elements that are arranged in groups and periods. The groups contain elements that are chemically similar and could react in the same way while the periods contain elements that have the same number of shells.
However, we know that an alternative method for the arrangement of elements is by the use of atomic masses of the elements. This was the method that was used arrange the old periodic table. However, this method did not account for periodic trends.
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What is the molarity of a solution of 0.5 mol of Cu(NO3)2 in 0.5 L water?
OA. 2 M
OB. 1 M
C. 0.25 M
OD. 0.5 M
The molarity of a solution of 0.5 mol of Cu([tex]NO_3[/tex][tex])_2[/tex]in 0.5 L water is 1 M.
molarity of a solution of 0.5 mol of Cu([tex]NO_3[/tex][tex])_2[/tex] in 0.5 L water
as per statement , we have got
moles of Cu(NO3)2 = 0.5 mol
volume of solution = 0.5 L
now:
we use the formulae of molarity written as M
molarity = moles of solute / volume of solution
molarity = 0.5/0.5
molarity = 1 M
Molarity is defined as the number of moles of solute per liter of solution.molarity is a volume based concentration, as the temperature increases the volume increases and molarity decreases but the molality is not depend on volume is by the variation in temperature molality remins constant.To know more about molarity visit :
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A __________ is a piece of land that is formed when a river splits into smaller rivers before flowing into an ocean.
butte
delta
glacier
hill
Answer: A) Delta
Explanation:
A river delta is a landform shaped like a triangle, created by deposition of sediment that is carried by a river and enters slower-moving or stagnant water. This occurs where a river enters an ocean, sea, estuary, lake, reservoir, or another river that cannot carry away the supplied sediment.
Hope this helped!
2NH3 + H₂SO4 → (NH4)2SO4
Calculate the percentage atom economy to form the fertiliser ammonium sulphate in the above reaction
The percentage atom economy is 62%
2NH3 + H₂SO4 → (NH4)2SO4
34 gram 98 gram 210 gram
2 mol 1 mol 1 mol
% atom economy = mass of atoms in desired product/total mass of atom in Product x 100
% atom economy = 132/210 x 100 = 0.62 = 62%
What is Atom economy ?The amount of desirable useful products produced from reactants is measured by atom economy, also known as atom efficiency. It is frequently expressed as a percentage and is referred to as percentage atom economy. The required product atoms are divided by the total number of reactants, which is equal to the total number of product atoms, to determine the percent atom economy
Higher atom economy reactions provide more of the desired product while producing less waste.
The following stages can be used as a generic method to compute the atom economy:
Create a chemical equation for the reaction provided.Equilibrate the variables.Utilizing the periodic table's atomic and formula masses, determine the masses of the reactants and products. The total mass of the reactants on the left side and the total mass of the products on the right side are always equal in a correctly balanced equation.Determine the atom economy percentage.
Hence, percentage atom economy is 62%
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How does this illustration demonstrate nonverbal communication? What messages are being communicated?
In the first picture, the person seems nervous and lacks confidence while in the second one the person appears confident.
Nonverbal communication is the transfer of information through body language, facial expressions, gestures, created space, and more.
body language is essential as it makes the communication process more efficient.
facial expression depicts the nervousness and confidence of the person.
gestures involve hand movements.
In the first picture, we can see that the person's posture is bent and looking below.
In the second picture, the person has a straight posture and looks parallel.
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Gelatinous precipitate such as Aluminium hydroxide are best filtered using O a. ashless filter paper b. ash filter paper O c. oxalate d. sintered glass crucible.
Ashless filter paper is the correct option.
The process of turning unusable water into drinkable (potable) water is known as water purification. Since water creates an excellent solvent, getting pure water without treatment is challenging.Coarse filtering is used in the initial stage to get rid of big foreign objects. By letting the water pass through a mesh screen, this is accomplished. Sedimentation is the subsequent phase. To allow for the separation of tiny particles, the water is left to stand. Aluminum sulfate and calcium oxide in the water help in this process. Aluminum hydroxide reacts with some of the water to generate a gelatinous substance. The slow-moving gelatinous precipitation drags down particles as it settles.Following aeration, the water is filtered through a fine sand bed to oxidize dissolved organic molecules. Sterilization of the water is the last step. This is frequently done by bubbling chlorine gas through the water, which creates a mild acid that kills any germs that are still present. In this procedure, ozone can also be employed in place of chlorine.Therefore, option a. is correct.
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Q1.
An athlete decides to try a new type of protein drink after he exercises.
(a)
The athlete tests the protein drink to check it contains protein.
Which solution is used to test for protein in the drink?
Tick one box.
Benedict's
Biuret
lodine
Universal indicator
To check the protein in the drink the test carried out is Biuret Test
What is Biuret Test?
The chemical test known as the "Biuret test" uses the Biuret reagents to produce the compound known as "Biuret," which is created by heating urea to 180 °C. A 1% solution of Copper II sulphate is used in the test
([tex]CuSO_{4}[/tex]). The peptide bonds found in proteins create a compound with the [tex]Cu^{2+}[/tex] in the Biuret reagent. This test therefore aids in identifying peptide bonds in any substance.
The reagent in the biuret test does not really include biuret; however, the test's name derives from the fact that the peptide-like linkages in the biuret molecule produced a favorable reaction.
Two of the many more sophisticated variations of the biuret test are the Lowry test and the BCA test.
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convert 64.3 kilograms to milligrams
Answer:
64.3 kilograms = 64300000 milligrams
Hope this helps :)
How many moles of ethylenediamine (H2NCH2CH2NH2) are contained in 10.4 ml of 25% ethylenediamine solutions? The density of the solution is 0.950 g/mL.
Moles of ethylenediamine contained in 10.4 ml of 25% ethylenediamine solutions is 0.0388 moles
What is mole?
A mole is defined as 6.02214076 × 10²³ of some chemical unit, be it atoms, molecules, ions, or others.
Given:
volume=9.8 mL
Density= 0.960 g/mL
Percent concentration of solution= 25%
mass of nickel chloride=1.85 g
mass = density * volume
mass = 0.950 g/ml * 9.8 ml
mass = 9.31g
Since it is a 25 % solution of Ethylenediamine
mass of ethylenediamine in 25 moles
moles of ethylenediamine = [tex]\frac{2.33g}{60g/mol}[/tex] =0.0388 moles
Thus, Moles of ethylenediamine contained in 10.4 ml of 25% ethylenediamine solutions is 0.0388 moles.
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an iron ( Fe ) bar that loses 2.42 kJ when its temperature decreases from 252 ∘C to 79 ∘C
The calculated mass is 35.6.
The movement of minuscule atoms, molecules, or ions in solids, liquids, and gases produces heat energy. From one thing to another, heat energy can be exchanged. Heat is the flow or transfer that occurs as a result of the temperature differential between two objects.
Q = m*c*ΔT,
ΔT = Initial T - Final T
For iron, the specific heat capacity is 0.450 J/(g°C) and ΔT Q is the heat energy in calories (2.92 KJ = 2920 Joules).
The mass of water is m.
The values 2920 J= m* 0.450 J/g°C * are entered (254 °C-72 °C)
The solution is mass=2920 J/ 0.450*180°C
mass = 35.6.
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In the model below, what do the green spheres represent?
Nucleus
Protons
Neutrons
Electrons
Answer:
They represent electrons
Explanation:
Whats oxide element name
Answer: Oxide anion. Oxide ion. Atomic oxygen(2-) Oxygen, ion(O2-)
Description: Oxide(2-) is a monoatomic oxyge...
Molecular Formula: O-2
Synonyms: oxideoxide(2-)16833-27-5Oxide a...
Molecular Weight: 15.999
Explanation: I hope this helps.
If a space shuttle can travel 17,000 miles per hour, how many meters per second does it travel?
If a space shuttle can travel 17,000 miles per hour, then it can travel 7599.68 meters per second.
What is Miles per hour ?The unit miles per hour (which is also denoted by symbol: mph) is a measurement of speed in the United States of America primary systems. It expresses the number of miles one can travelled over the period given as one hour. One Miles per hour equals accurately 1.609344 Kilometers per hour (km/h).What is Meter per Second ?A meter per second (denoted as symbol: m/s) is an SI (International System of Units) denoted unit of speed and velocity. It is denoted as the distance travelled in meters upon the amount of time taken in seconds. It is equal to accurately 3.6 kilometers per hour. It is equal to accurately 3.2808 feet per second. It is equal to accurately 2.2369 miles per hour.Now,
2.2369 miles per hour = 1 meter per second
Hence,
17000 miles per hour = (17000/2.2369) meter per second
= 7599.68 meters per second.
Thus , from the above conclusion we can say that If a space shuttle can travel 17,000 miles per hour, then it can travel 7599.68 meters per second.
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Pls help which of the following statements is true
A. None are correct.
Explanation:
Proton has positive charge and mass too.
A neutron is chargeless and has mass as well.
An electron has negative charge and has mass.
The atomic number of carbon is 6.
Hence none are correct.
Why can’t calcium ,CA, be broken down into a simpler substance?
the local high school recently passed a rule reducing how much teachers can count homework as a part of a student's grade. Consequently, a larger portion of the students stop doing their homework. A teacher there decides to conduct there experiment. All of his classes get an optional ''test guide'' to help them study for their test.
An experiment occurs when we want to study the relationship between the dependent and the independent variable. We know that the independent variable is the variable that is manipulated in the experiment and the dependent variable variable is the variable that undergoes a change as we change the independent variable.
It must be known that an experiment is the only way that we could be able to establish a cause and effect relationship. In other words, the results of an experiment tell us categorically if the effect owes to a supposed cause as was captured in the hypothesis of the experiment.
In this case we have the following in this experiment;
The independent variable is the use or absence of the test guide
The dependent variable is the overall performance in the academic year
The control group is the group that did not use the test guides
The experimental group is the group that used the test guides
The constants are the method of instruction, the structure of the test and the difficulty of the test.
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Missing parts;
The local high school recently passed a rule reducing how much teachers can count homework as part of a student's grade. Consequently, a larger portion of the students stop doing their homework. A teacher there decides to conduct an experiment. All of his classes get an optional "test guide" to help them study for their tests. He allows two classes to use the "test guides" (that they must fill in and complete) on their exams. He hypothesizes that students will complete the test guides and learning will occur from filling them out. In his other 2 classes, the teacher does not allow students to use test guides on the exam, and consequently very few of them filled them out. After the 2017-2018 year is over, he wants to compare scores between the 4 classes on the final exam to see if allowing students to use test guides during each test throughout the year improved their later overall performance.
Independent Variable: _____________________________ Dependent Variable: ___________________________________
Experimental Group: _______________________________ Control Group: _________________________________________
3 constants: ______________________________________________________
4. A steel ball has a diameter of 0.750 cm and weighs 1.765 g. What is its density in grams
per cubic centimeter?
Taking into account the definition of density, the density of the steel ball is 7.99 g/cm³.
Definition of densityDensity is defined as the property that matter, whether solid, liquid or gas, has to compress into a given space and it allows us to measure the amount of mass in a certain volume of a substance.
The expression for the calculation of density is the quotient between the mass of a body and the volume it occupies:
density= mass÷volume
Density is inversely proportional to volume: the smaller the volume occupied by a given mass, the higher the density.
Density in this caseIn this case, you know that:
Mass= 1.765 gDiameter of steel ball= 0.750 cmRadius of a steel ball= diameter of steel ball÷2= 0.375 cmVolume of a steel ball= Volume of a sphere= 4/3×π×r³= 4/3×π×(0.375 cm)³= 0.2209 cm³Replacing in the definition of density:
density= 1.765 g÷0.2209 cm³
Solving:
density= 7.99 g/cm³
In summary, the density of the steel ball is 7.99 g/cm³.
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Which graph represents an exothermic reaction?
Answer:
This one also it is opposite of endothermic reaction
Pb + PbO2 + 2H2SO4 → 2PbSO4 + 2H2O
What is the mole ratio of PbO2 to water
The mole ratio of PbO2 to water is 1:2.
The mole ratio of PbO2 to water, PbO2:H2O, is 1:2 when the reaction stoichiometry is taken into consideration.
The appropriate reaction is:
2 PbSO4 + 2 H2O ⇒ Pb + PbO2 + 2 H2SO4
The following numbers of moles of each component are involved in the reaction according to reaction stoichiometry, which describes the relationship between the amounts of reagents and products in a chemical reaction:
1 mole Pb
1 mole of PbO2
H2SO4: 2 mol
2 moles of PbSO4
Water: 2 moles
Then, you can see that according to the reaction's stoichiometry, 1 mole of PbO2 produces 2 moles of water (H2O).
Therefore,the mole ratio of PbO2 to water is 1:2.
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To separate a mixture of hard candies and
marbles, the most efficient method would be
DONE
To separate a mixture of hard candies and marbles, the most efficient method would be filtration .
A mixture is just the physical mixing of a mixture's constituent parts, including suspensions and colloids, that maintain their identities and are thus combined in the necessary proportions.
One or more sweetener syrups are heated to 160°C to create a sugar confection known as a hard candies , often referred to as a boiled sweet.
To avoid damaging the water pipes, boil the candies if marbles are present unless they dissolve in water. Then, place a filter in the sink and run cold water for two minutes when pouring the water into the strainer and after emptying it.
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A pushing force of 7 N to the right is applied to a book on a table. A frictional force of 3 N is applied in the opposite
direction. In which direction will the book move? (1 point)
O The book will move to the left.
O The book will move to the right
O More information is needed.
O The book will stay stationary.
The book will move to the right.
Hope this helps! Also, if you need help with the other questions regarding this assignment, feel free to check out the study set I made on Quizlet. Thanks and good luck!
Quizlet - "Unit 6: Lesson 2 Newton's First Law QC"
h t t p s : / / q u i z l e t. c o m / 7 3 7 7 5 9 5 5 5 / u n i t - 6 - l e s s o n - 2 - n e w t o n s - f i r s t - l a w - f l a s h - c a r d s / ? n e w
If two forces acts in opposite directions on an object, they will cancel each other in magnitude. Thus if 7N force is applied to the right and 3 N to the left, the net force will be 4 N to the right. Hence, option b is correct.
What is force?Force is an external agent acts on a body to change it from the state of motion or rest. There are various kinds of force namely, frictional force, gravitational force, nuclear force, magnetic force etc.
The force acting on a body to displace from one position to other is called normal force. Frictional force is resistive force which resist the motion of a body.
If two force are acting on a body in same direction, then the resultant force be the sum of magnitudes of these force. If they are acting in opposite direction then the force will be cancelled from each other
Hence, Net force is the difference in magnitude and the direction of net force is the direction of the force which was greater in magnitude.
Therefore, here the net force on the body which undergone two opposite force of 7N to right and 3N to left is 4N to the right.
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In a density measurement, you determine the mass of an object to be 10.50 +/- 0.02 g and the volume of the object to be 1.638 +/- 0.005 mL. You divide the mass by the volume to determine the density of the object in g/ml. What is the final propagated error on the density?
Select one:
a.
+/- 0.0004 g/mL
b.
+/- 0.04 g/mL
c.
+/- 0.0002 g/mL
d.
+/- 0.02 g/mL
The final propagated error on the density is +/-0.02g/mL
The density is the amount of a specific material per unit volume. d = M/V, where d is density, M is mass, and V is volume, is the formula for density. Grams per centimeter are a common measurement unit used for density.
The relationship between mass and volume can be easily determined using density; for instance, the mass of a body is equal to its volume multiplied by the density (M = Vd), whereas the volume is equal to the mass divided by the density (V = M/d). By multiplying a body's mass by the acceleration of gravity, one can get the weight of the object, which is usually more important practically than its mass.
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Matter can change state when ______ energy is ______ into or out of the ______.
Fill in the blanks.
Thank you
Matter can change state when thermal energy is absorbed into or out of the body.
What energy is used to change the state of matter?Changing states of matter occur when matter loses or absorbs thermal energy. When a substance absorbs energy, the atoms and molecules move more fast which increases kinetic energy of the atoms that pushes particles far enough from each other which resulted in the change of form. This energy which changes the state of matter is the heat or thermal energy. We know that thermal energy increases kinetic energy so that's why the heat energy changes state of matter.
So we can conclude that Matter can change state when thermal energy is absorbed into or out of the body.
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What is the weighted average of a nail in the sample data given
Answer:
11.176
Explanation:
find heat capacity when 47.0 J of heat is added to 13.0 g of a liquid, its temperature rises by 1.71 ∘C
Heat capacity when 47.0 J of heat is added to 13.0 g of a liquid, its temperature rises by 1.71 ∘C is 22.23 J/ ∘C g .
from the above statement we have got
Q = 47.0 J
MASS = 13.0 g
temperature (T) = 1.71 ∘C
heat capacity ( c ) = ?
NOW, from the formulae , Q = mcΔt
put all the values given in equation
47.0 J = 13.0 g [tex]\times[/tex] c [tex]\times[/tex]1.71 ∘C
c = 47.0 ÷ 13.0[tex]\times[/tex]1.71
c = 47/22
c = 22.23 J/ ∘C g
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how many significant figures are contained in 38.7g, 2x10^18m, 3486002kg, 9.74150x10^4j, 0.0613cm^3,17.0kg, and 0.014g/mL
The number of significant figures contained in the following values are as follows:
38.7g - 32 x 10¹⁸m - 23486002kg - 79.74150 x 10⁴J - 60.0613cm³ - 317.0kg - 30.014g/mL - 2What is significant figures?Significant figures are digits that is meaningful with respect to the precision of a measurement.
Significant figures are digits that is nonzero, followed by a nonzero digit, or (for trailing zeroes) justified by the precision of the derivation or measurement.
According to this question, the number of significant figures contained in the following values are as follows:
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