Answer:
(a). 4°C, (b). 2.4M, (c). 11.1 g, (d). 89.01 g, (e). 139.2 g and (f). 58 g/mol.
Explanation:
Without mincing words let's dive straight into the solution to the question.
(a). The freezing point depression can be Determine by subtracting the value of the initial temperature from the final temperature. Therefore;
The freezing point depression = [ 1 - (-3)]° C = 4°C.
(b). The molality can be Determine by using the formula below;
Molality = the number of moles found in the solute/ solvent's weight(kg).
Molality = ( 11.1 / 58) × (1000)/ ( 90.4 - 11.1) = 2.4 M.
(c). The mass of acetone that was in the decanted solution = 11.1 g.
(d). The mass of water that was in the decanted solution = 89.01 g.
(e). 2.4 = x/ 58 × (1000/1000).
x = 2.4 × 58 = 139.2 g.
(f). The molar mass of acetone = (12) + (1 × 3) + 12 + 16 + 12 + (1 x 3) = 58 g/mol.
How many moles are there in 7.24 grams of calcium carbonate? With work shown
Answer:
0.0723371390261859
Which of the following is not something that should be considered when creating a debt payment plan?
a. In general, the larger the debt, the longer you should plan to take to pay it off.
b. Higher interest rates create more cost than lower interest rates on a similar debt.
C. Making a payment larger than required or expected will help pay off the debt sooner.
d. The longer you take to pay off your debt, the more you will be paying in interest and other
fees
Answer:
a. In general, the larger the debt, the longer you should plan to take to pay it off.
When paying off debt consider the interest rates. C., and D. are just facts.
In general, the larger the debt, the longer you should plan to take to pay it off. The correct option is a.
What is debt payment plan?A debt payment plan is a way to pay off debts gradually. It usually entails consistent payments toward the balance due on each loan.
The total amount of debt, interest rates, minimum payments, and the time frame for repayment should all be taken into account while making a debt payment plan.
You can lower the amount of interest you pay over time by making a payment that is greater than what is required or anticipated in order to assist you pay off the debt sooner.
The longer it takes you to pay off your debt, the more vital it is to bear in mind.
In general, when making a debt payment plan, you shouldn't take into account the fact that the debt will take longer to pay off the larger it is.
Thus, the correct option is a.
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What does cellular respiration do?
Break down sugar and release energy for an
organism to use
Create sugar filled with energy
Deter predators
Form glucose from hydrogen, oxygen, and carbon
:D
help asap
How does fertilizer benefit the daily lives of people?
Answer:
Fertilizers play an important role in providing crops with the nutrients they need to grow and be harvested for nutritious food. Fertilizers help deliver enough food to feed the world's population. ...
For example, micronutrients such as zinc are important to human nutrition, especially children.
Explanation:
Hope it is helpful.....
If potassium reacts so dangerously with water, and people are mostly made of water, why can we eat bananas without blowing up?
Answer:
A banana, like most other lifeforms, is about 70% water, and all the potassium it contains already exists in the form of K+ ions dissolved in water. Which is why bananas do not explode in water, or spontaneously combust.
analyze how animals benefit from the process of photosynthesis in plants
Answer:
Animals benefit from photosynthesis, because they consume the plants and therefore the sugars stored in the plants from the process of photosynthesis for energy
Explanation:
what is valence electron configuration for group 4A (14)
Answer:
The group 14 elements all have ns2np2 valence electron configurations. All form compounds in which they formally lose either the two np and the two ns valence electrons or just the two np valence electrons, giving a +4 or +2 oxidation state, respectively
Explanation:
Answer:
The group 14 elements all have ns2np2 valence electron configurations. All form compounds in which they formally lose either the two np and the two ns valence electrons or just the two np valence electrons, giving a +4 or +2 oxidation state, respectively.
Explanation:
Is nitric acid a strong or weak acid. Explain your answer.
Answer:
There are only a few (7) strong acids, so many people choose to memorize them. All the other acids are weak. The strong acids are hydrochloric acid, nitric acid, sulfuric acid, hydrobromic acid, hydroiodic acid, perchloric acid, and chloric acid.Explanation:
그것은 당신의 교육에 도움이 되기를 바랍니다
how many moles are in 1.505x10^24 molecules of surcrose
Answer:
2.499 moles of sucrose
Explanation:
Divide by Avogadro's number
Pleaseee I need help and it is urgent
Answer:
1)4180j
2)15000kj
Explanation:
[tex]1) E=100*(30-20)*4.18=4180j\\2)Q=.5*30*1000=15000kj[/tex]
Which ecosystem is most resilient to change due to its high diversity?
mountain meadow
stormwater pond
coral reef
arctic fundra
Answer:
coral reef
Explanation:
It is often possible to change a hydrate into an anhydrous compound by heating it to drive off the water (dehydration). Write an equation that shows the dehydration of manganese(II) sulfate pentahydrate . Use an asterisk to enter the dot.
Answer:
MnSO4.5H2O(s) ---------> MnSO4(s) + 5H2O(g)
Explanation:
The dehydration of a hydrate implies that the water of crystallization is lost. Water of crystallization is included in the crystal structure as it is formed and is incorporated into the structure of the compound.
Now the equation for the dehydration of manganese(II) sulfate pentahydrate is;
MnSO4.5H2O(s) ---------> MnSO4(s) + 5H2O(g)
The MnSO4 is now said to be anhydrous.
List four kinds of energy. Give a brief definition of each.
Answer:
Mechanical Energy- Energy that result from movement or the location of the object. Is the sum of kinetic and potential energy.
Thermal Energy- Thermal energy or heat energy reflects the temperature difference between two systems.
Nuclear Energy- is energy resulting from changes in the atomic nuclei or from nuclear reactions.
Chemical Energy- results from chemical reactions between atoms or molecules.
More:
Kinetic energy- is the energy of motion of a body. It ranges from 0 to a positive value.
Electromagnetic energy- (or radiant energy) is energy from light or electromagnetic waves.
Sonic energy- is the energy of sound waves. Sound waves travel through the air or another medium.
Gravitational energy- energy associated with gravity involves the attraction between two objects based on their mass.
Ionization energy- is the form of energy that binds electrons to the nucleus of its atom, ion, or molecule.
Potential energy- is the energy of an object's position.
Explanation:
Hope this helps
A balloon is filled with 30L of helium gas at 1atm.What is the volume when balloon rises to an attitude where the pressure is only 0.25 atm?
Answer:
[tex]V_2=120L[/tex]
Explanation:
Hello!
In this case, since Helium is undergoing a volume-pressure change, according the Boyle's law, we infer the following equation is used:
[tex]P_1V_1=P_2V_2[/tex]
Thus, since we are not given the volume at 0.25 atm, we can solve for V2 to do so:
[tex]V_2=\frac{P_1V_1}{P_2}[/tex]
Thus, we plug in to obtain:
[tex]V_2=\frac{1atm*30L}{0.25atm}=120L[/tex]
Best regards!
The final volume of the balloon at the given altitude is 120 L.
The given parameters;
initial volume of the balloon, V₁ = 30 Linitial pressure, P₁ = 1 atmfinal pressure of the balloon, P₂ = 0.25 atmThe final volume of the balloon at the given altitude is calculated by applying Boyles law as follows;
[tex]P_1 V_1 = P_2 V_2\\\\V_2 = \frac{P_1V_1}{P_2} \\\\V_2 = \frac{30 \times 1 }{0.25} \\\\V_2 = 120 \ L[/tex]
Thus, the final volume of the balloon at the given altitude is 120 L.
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SUMMARY: Write a 3-4 sentence summary about the Periodic Table.
Answer:
The periodic table, also known as the periodic table of elements, is a tabular display of the chemical elements, which are arranged by atomic number, electron setup, and repeating chemical properties. The structure of the table shows occasional (popular things/general ways things are going). The seven rows of the table, called periods, generally have metals on the left and nonmetals on the right. The columns, called groups, contain elements with almost the same chemical behaviours. Six groups have accepted names as well as assigned numbers: for example, group 17 elements are the halogens; and group 18 are the noble gases. Also displayed are four simple rectangular areas or blocks connected with the filling of different atomic orbitals.
Explanation:
i think that's what you're looking for...
Someone please help me I’m so stuck I cannot find the empty ones that were not filled in :(. I’m really confused
Answer:
Positive charges: 2
Negative charges: 1
Overall charge: +1
Explanation:
In Diagram B we have the chemical element Helium (He). You can see in the Periodic Table that He has an atomic number of 2 and an atomic mass of approximately 4.
The atomic number is equal to the number of protons, so He has 2 protons. The protons are the positive charges in the atom, so the number of positive charges is 2. That is invariable, if the number of protons - or the atomic number - of an atom changes, it changes its identity.
In the drawing, we can see that the nucleus is composed of 2 protons (2 'p' particles) and 2 neutrons (2 'n' particles). The atomic mass is calculated as the number of protons and neutrons, so 2 protons+ 2 neutrons = 4.
The surrounding particle with an 'e' is an electron. So, we have 1 electron. Electrons are negative charges, so the number of negative charges is 1.
Now, we can calculate the overall charge. We add the positive charges (protons) and negative charges (electrons). Each proton has a +1 charge, whereas each electron has a -1 charge. Finally, we perform the addition:
Overall charge= (number of protons x charge) + (number of electrons x charge) = (2 x (+1)) + (1 x (-1)) = (+2) + (-1) = +1
26. Find the volume of 111.6 grams of NH3 gas.
Answer:
It is 148.82 L
Explanation:
I need more points. And I hope this helps.
• as it sits on top of a building that is 50 meters tall.
• as it is half-way through a fall off a building that is 50 meters tall and travelling 19.8 meters per second.
• as it is just about to hit the ground from a fall off a building that is 50 meters tall and travelling 28 m/s
What is the potential energy of the ball as it is half-way through the fall (25 meters high)?
Help pls! I need help im just writing to use the character limit!
Answer:
se que la imaje es un poco confusa con la materia pero
desiaria ayudarte pero CREO que con mi TÉCNICA es la A
10. How might life in America be different if the Civil Rights Movement had never happened?
a. Public places could still be segregated
b. Voting would be easier for everyone
c. Slavery might still exist
d. Americans would be more tolerant of peaceful protests
Answer: A or C because of the civil right movement changed a lot of stuff as if it never happened blacks would of still be segregated, the U.S wouldn't be the same and they also mentioned that the U.S would not be respected by many other countries which would hurt them from developing even more in the future.
Determine the number of molecules in 0.0500 mole of boron tribromide
(show work)
Answer:
There are 0.5 moles
Explanation:
According to avogadro's law, 1 mole of every substance occupies 22.4 L at STP and contains avogadro's number of particles.
To calculate the moles, we use the equation:
Thus there are 0.5 moles
Explanation:
1. A solution is always a mixture (true or false)
im not sure what the answer is so if anyone could help me that would be great
(ps im in 5th grade)
Answer:
yes solution is always a mixture but not all mixtures are solution
Explanation:
A solution.is a homogeneous mixture of substance that have uniform composition throughout
And a mixture hVe twoo or more substances that are not chemically.combine
formula for calculating pressure
Answer:
The formula for pressure is P = F/A, in which P is pressure, F is force, and A is area.
Explanation:
Observe: Select the Show polar molecule inset checkbox. The animation shows the probable location of electrons (orange dots) in a polar molecule. A. What do you notice about the distribution of the electrons? B. How does this electron distribution affect the charges of the bonded atoms?
Answer:
A. In a polar molecule, the bond is polar covalent. That is, the electrons are shared but are slightly more attracted to the more electronegative atom. That part of the molecule has a negative partial charge density, and the other has a positive partial charge density (there is no symmetry in the distribution of the electricity density)
B. Charges are not affected, the molecule is neutral because electrons are shared. A molecule has the same number of electrons and protons which balance the charges in a molecule. Since all atoms are electrically neutral, then when they combine the form of a neutral molecule.
Explanation:
To determine polarity, the geometry of the molecule must be taken into account to determine the distribution of atoms and their electronegativity (tendency to attract electrons) to determine to which points of the molecule the electrons will be most attracted.
Atoms can share electrons to form chemical bonds and thus form different compounds. In the case of non-polar molecules, when formed in a covalent bond (two atoms bond by sharing valence electrons reaching "stable octet") between equal atoms, the molecule is neutral since it has zero electric charge. In this type of bond there is no change in the oxidation number of the atoms because their shared electrons are equidistant. Covalent bonds in which the electrons are shared equally are called non-polar covalent bonds. This is because the atoms are just the same, they have the same electronegativity, so they "attract" the electrons with the same force and the electrons surround the atoms equally. The charge density distribution is the same for both, there is asymmetry in the distribution of it.
Polar molecules are formed when bonds are formed by different atoms with large differences in electronegativity. The molecule is electrically neutral as a whole because it has an equal number of positive and negative particles, but there is no symmetry in the distribution of the electricity density. A polar bond is one in which a pair of electrons is more attracted to one of the atoms. This causes one end of the molecule to acquire a positive partial charge density and the other end of the molecule to acquire a positive partial charge density and the other end of the molecule to acquire a negative partial charge.
So, as a summary:
A. In a polar molecule, the bond is polar covalent. That is, the electrons are shared but are slightly more attracted to the more electronegative atom. That part of the molecule has a negative partial charge density, and the other has a positive partial charge density (there is no symmetry in the distribution of the electricity density)
B. Charges are not affected, the molecule is neutral because electrons are shared. A molecule has the same number of electrons and protons which balance the charges in a molecule. Since all atoms are electrically neutral, then when they combine the form of a neutral molecule. Only ions do not have a neutral electrical charge because of the process of gaining or losing electrons. An ion with a positive electrical charge is called a cation, and an ion with a negative electrical charge is called an anion.
The image shown here is a good illustration of which law?
Answer:
A.) Newton's First Law
Explanation:
I'm pretty sure, I'm sorry if I'm wrong, I just looked it up on G o o g l e
Coach Scott hits a baseball with his bat to help his players with fielding
practice. The bat exerts a force on the ball, and the ball exerts an equal
and opposite force back on the bat.
A. Newton’s first law
B. Newton’s second law
C. Newton’s third law
Answer:
The ball exerts an equal and opposite force on the bat. This is the reaction force. Such an interaction pair is another example of Newton's Third Law. The baseball forces the bat in one direction and the bat forces the ball in the opposite direction.
Choose the statement that best describes the effect of temperature on atoms and molecules.
A temperature decrease results in particles having more collisions with other particles
Solids have more kinetic energy than gases.
Decreasing temperature can cause a liquid to become a gas
increases in temperature cause partides to speed up and have more collisions.
Answer:
option D is correct answer of this question
Answer:
Explanation:
As the temperature of a liquid rises, the average speed of its molecules rises as well. The molecules in a liquid move faster as the temperature rises, increasing the liquid's kinetic energy. Heating liquids will demonstrate this property in experiments.
It takes 38.6 kJ of energy to vaporize 1.00 mol of ethanol (MW: 46.07 g/mol). What will be ΔSsys for the vaporization of 8.00 g of ethanol at 79.6 °C
Answer:
[tex]\Delta S_{sys}=0.020kJ=20J[/tex]
Explanation:
Hello!
In this case, given the required energy to vaporize 1.00 mol of ethanol as the enthalpy of vaporization:
[tex]\Delta H_{vap}=\frac{38.6kJ}{1.00mol}=38.6kJ/mol[/tex]
We can compute the entropy of the system for the vaporization of 8.00 g of ethanol, by first computing the moles:
[tex]n_{et}=8.00g*\frac{1mol}{46.07g} =0.174mol[/tex]
And then setting up the following expression:
[tex]\Delta S_{sys}=\frac{n_{et}*\Delta H_{vap}}{T}[/tex]
Whereas the temperature is in kelvins; thus, we obtain:
[tex]\Delta S_{sys}=\frac{0.174mol*38.6\frac{kJ}{mol} }{79.6+273.15K}\\\\\Delta S_{sys}=0.020kJ=20J[/tex]
Best regards!
The entropy of the system ([tex]\Delta S_{sys}[/tex]) for the vaporization of 8.00 grams of ethanol at 79.6 °C is 0.0190 kilojoules.
Given the following data:
Quantity of energy = 38.6 kJNumber of moles of ethanol = 1 moleMolar mass of ethanol = 46.07 g/molMass of ethanol = 8 gramsTemperature = 79.6 °CConversion:
Temperature = [tex]79.6 + 273 = 352.6 \;K[/tex]
To find the entropy of the system ([tex]\Delta S_{sys}[/tex]) for the vaporization of 8.00 grams of ethanol at 79.6 °C:
First of all, we would determine the heat of vaporization.
[tex]Heat\; of \;vaporization = \frac{Energy}{moles} \\\\Heat\; of \;vaporization = \frac{38.6}{1}[/tex]
Heat of vaporization = 38.6 kJ/mol.
Next, we would determine the number of moles in 8.00 grams of ethanol:
[tex]Number\;of\;moles = \frac{mass}{molar\;mass}\\\\Number\;of\;moles = \frac{8}{46.07}\\\\Number\;of\;moles = 0.1737 \;moles[/tex]
Mathematically, the entropy of a system ([tex]\Delta S_{sys}[/tex]) is given by the formula:
[tex]\Delta S_{sys} = \frac{n\Delta H }{T}[/tex]
Where:
n is the number of moles.T is the temperature.[tex]\Delta H[/tex] is the heat of vaporization.Substituting the given parameters into the formula, we have;
[tex]\Delta S_{sys} = \frac{0.1737 \times 38.6 }{352.6}\\\\\Delta S_{sys} = \frac{6.7048 }{352.6}\\\\\Delta S_{sys} = 0.0190 \;kJ[/tex]
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20 POINTS! NEED HELP!!!
When naming covalent bonds, do all of the following except?
1. use prefixes
2. write the left-most element first
3. add -ide to the end of the 2nd element
4. write the metal first
Answer:
number 2
Explanation:
even though i have never done this i still got it right
Because metals do not form covalent bonds, when naming covalent bonds, all the given rules apply except write the metal first; option 4.
What are covalent bonds?Covalent bonds are bonds formed by the sharing of valence electrons between the atoms involved in the bonding.
In naming covalent bonds, the following rules are applied:
Name the non-metal furthest to the left on the periodic table by its elemental name.Name the other non-metal by its elemental name and an -ide ending.Use the prefixes mono-, di-, tri-, tetra etc. to indicate the number of that element in the molecule.If the first prefix is mono, it is not written add -ide to the end of the second elementFor example, CO₂, is carbon dioxide.
Therefore, when naming covalent bonds, all the given rules apply except write the metal first because metals do not form covalent bonds.
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An analytical chemist is titrating of a solution of ethylamine with a solution of . The of ethylamine is . Calculate the pH of the base solution after the chemist has added of the solution to it. Note for advanced students: you may assume the final volume equals the initial volume of the solution plus the volume of solution added. g
Answer:
pH=11.
Explanation:
Hello!
In this case, since the data is not given, it is possible to use a similar problem like:
"An analytical chemist is titrating 185.0 mL of a 0.7500 M solution of ethylamine(C2HNH2) with a 0.4800 M solution of HNO3.ThepK,of ethylamine is 3.19. Calculate the pH of the base solution after the chemist has added 114.4 mL of the HNO3 solution to it"
Thus, for the reaction:
[tex]C_2H_5NH_2+H^+\rightleftharpoons C_2H_5NH_4^+[/tex]
Tt is possible to compute the remaining moles of ethylamine via the following subtraction:
[tex]n_{ethylamine}=0.1850L*0.7500mol/L=0.1365mol\\\\n_{acid}=0.1144L*0.4800mol/L=0.0549mol\\\\n_{ethylamine}^{remaining}=0.1365mol-0.0549mol=0.0816mol[/tex]
Thus, the concentration of ethylamine in solution is:
[tex][ethylamine]=\frac{0.0816mol}{0.1850L+0.1144L}=0.2725M[/tex]
Now, we can also infer that some salt is formed, and has the following concentration:
[tex][salt]=\frac{0.0549mol}{0.1850L+0.1144L}=0.1834M[/tex]
Therefore, we can use the Henderson-Hasselbach equation to compute the resulting pOH first:
[tex]pOH=pKb+log(\frac{[salt]}{[base]} )\\\\pOH=3.19+log(\frac{0.1834M}{0.2725M})\\\\pOH=3.0[/tex]
Finally, the pH turns out to be:
[tex]pH=14-pOH=14-3\\\\pH=11[/tex]
NOTE: keep in mind that if you have different values, you can just change them and follow the very same process here.
Best regards!
