The internal energy change, ΔrU, for the combustion of 29.3 g of vitamin C (C6H8O6, molar mass is given as
-2.33810^3 kJ/mal
This is further explained below.
What is internal energy change,?Generally, The total of heat transmitted and work performed represents the change in the internal energy of a system. The change in the system's internal energy plus the PV work completed equals the heat flow.
Given
Mass of Vitamin C=29.3g
Molar mass of Vitamin C=176.124g/mol
C cal =8.31 KJJ^0
[tex]\Delta T &=68.3-21.5[/tex]
=46.8^0
Bomb Calorimeter is a fixed volume, [tex]\Delta u=q+\omega=q[/tex]
hence, heat generated by a reaction, denoted by released, equals heat generated by a calorimeter, denoted by again.
qreleased=-gained
[tex]=-C_{\text {cal }} \Delta T \\[/tex]
Where
q= heat
T is temp
=-8.31* 468^o
=-388.908KJ
[tex]$\begin{aligned} \text { No. of moles of Vitamin } C &=\frac{29.3 \mathrm{~g}}{176.124 \mathrm{~g} / \mathrm{mol}} \\ &=0.1663 \mathrm{moles} \end{aligned}$[/tex]
No. of moles of Vitamin [tex]=\frac{29.3 \mathrm{~g}}{176.124 \mathrm{~g} / \mathrm{mol}}[/tex]
=0.1663moles
On combustion of 29* 3 =0.1663 moles of Vitamin C,
[tex]$\Delta u[/tex]=-388.908KJs
Therefore Permole of Vitamin C,
[tex]\Delta u=\frac{-388.908}{0.1663}[/tex]
=-2338.592
=-2.338 *10^3 KJ/mal
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the blank the acceleration since there is blank proportionaly between them
Samples of water are taken from two swimming pools. One has a ph of 4, the other a ph of 7.4. In which pool would you rather go swimming
Between water with a pH of 4 and one with a pH of 7.4, I will rather go swimming in the one with a pH of 7.4.
What is pH?The pH of a substance is the degree of acidity of alkalinity of the substance.
The pH scale ranges from 0 to 14. A pH of 7 is considered neutral.
Any pH below 7 is acidic. The further the pH is the downside of 7, the more acidic the substance.
Any pH above 7 is considered basic. The further the pH is the upside of 7, the more basic or alkaline the substance is.
Substances with very high or very low pH are usually corrosive and will harm the human body. The human body's pH ranges between 7.35 to 7.45.
Thus, swimming in water with a pH of 4 would be totally harmful to the body. Swimming in water with a pH of 7.4 would be safe.
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Positive cations in a sea of delocalized electrons are found in
ionic compounds
covalent compounds
aqueous solutions of ionic compounds
metals
Positive cations in a sea of delocalized electrons are found in Metals.
So, the correct option is D.
Electricity flows take place as the structure of solid metals contains delocalized electrons as well. The aligned positive ions (cations) in the metallic structure are surrounded by a "sea" of delocalized electrons. This creates characteristics like conductivity by allowing the electrons to travel freely throughout the structure. The orbital that encompasses multiple nearby atoms contains delocalized electrons. In aromatic and mesoionic systems as well as conjugated double-bond systems, delocalized electrons can be discovered.
According to the "electron sea" hypothesis, metal atoms in solids shed their outermost electrons to arrange themselves into a regular lattice of positive metallic ions. The outside electrons do not "belong" to any one atom; instead, they create a sea or pool of delocalized electrons that are free to roam about the constant lattice of positive ions at random.
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is chalk made of calcium carbonate, CaCO3. explain which atoms are needed, and in what ratios, to make chalk. are the elements that make up chalk metals or nonmetal? what would you predict would happen when this substance is placed in water
Answer: calcium is metal and carbon and oxygen is non metal. If you place the chalk in the water there won’t be any chemical reaction
Explanation: Hope my answer is helpful
The unit for volume in W/V% questions is litres when mass is in grams. True False
The unit for volume in W/V% when mass is in grams is mililiters, g/mL, therefore this statement is false
A sample of gas occupies 3.7 L at a temperature of 250 K and a pressure of 3.0 atm. What is the new
volume when the temperature is changed to 6.9 x 10 K and the pressure decreased to 0.81 atm?
4.97 L
37.82 L
9.46 L
18.91 L
The new volume of the gas sample when the temperature is changed to 6.9 x 10 K and the pressure decreased to 0.81 atm will be 37.82 L. Option 2.
Gas lawThe problem can be solved with the general gas law.
p1v1/t1 = p2v2/t2
Where t1 = initial temperature of the gas, p1 = initial pressure of the gas, v1 = initial volume of the gas, t2 = final temperature of the gas, p2 = final pressure of the gas, and v2 = final volume of the gas.
In this case:
v1 = 3.7 L, t1 = 250 k, p1 = 3.0 atm
v2 = ?, t2 = 6.9 x [tex]10^2[/tex] K, p2 = 0.81 atm
v2 = p1v1t2/t1p2
= 3 x 3.7 x 6.9 x [tex]10^2[/tex]/250 x 0.81
= 7659/202.5
= 37.82 L
Thus, the new volume of the gas sample when the temperature and the pressure changed would be 37.82 L.
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What is the pressure of an 8.5 L cylinder filled with 23.5 grams of nitrogen gas at a temperature of 298 K?
To solve this question, we need to use the Clapeyron equation. The Clapeyron equation is a mathematical expression that relates quantities such as pressure (P), volume (V), temperature (T) and the number of particles (n) that make up an ideal gas.
The formula is PV = nRT.
First, let's transform 23.5 grams fo nitrogen gas (N2) into moles using its molar mass and the following formula: moles = mass/molar mass
molar mass of N2 = 28 g/mol
moles = 23.5/28 = 0.839 moles
Now let's use the formula PV = nRT
where:
P = ???
V = 8.5 L
n = 0.839 moles
R = 0.082 atm.L/K.mol
T = 298 K
P x 8.5 = 0.839 x 0.082 x 298
P = 20.51/8.5
P = 2.41 atm
Answer: the pressure is 2.41 atm
What is the balanced chemical equation for the reaction used to calculate ΔH∘f of BaCO3(s) ?
The balanced equation that can be used to fond the heat of formation is;
[tex]Ba(s) + C(s) + \frac{3}{2}O_{2} (g) ----- > BaCO_{3} (s)[/tex]
What is the heat of formation?The heat of formation is defined as the heat that is evolved or absorbed when a substance is formed from its component elements under standard conditions. Note that the components of the equations must be the substances that are in standard form.
In this case, we are trying to see the balanced chemical equation for the reaction used to calculate ΔH∘f of BaCO3(s). We have to know that is equation must have to involved the barium, carbon and oxygen atoms as the barium carbonate compound is formed.
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Need some help on this please!
The energy levels from lowest to highest energy is 1s, 2s, 2p, 3s, 3p, 4s, 3d and is therefore denoted as option A.
What is Energy level?This is referred to as a fixed distance of electrons from the nucleus of an atom and is the energy an electron has when it is above ground state and starts with the 1s.
The appropriate energy level from the least to the highest is in the order of 1s, 2s, 2p, 3s, 3p, 4s, 3d and they have the distinct number of electrons they contain thereby making option A the most appropriate choice.
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How many molecules are in 82.93 moles of N205?
Answer:
2.41 molecules.
Explanation:
hope this helps!
If you have a gas with a volume of 45 L, pressure of 1.01 atm, and a temperature of 25 degrees Celsius what is the amount of gas you have? Answer with 3 significant figures and no units.
Answer:
Explanation:
Comment
You have to look around for the best R to use. The problem is that R has different values depending on what the units of the givens are. In this case you have
Givens
V = 45 L
P = 1.01 atmospheres
T = 25 degrees = 25oC + 273 kelvin = 298 degrees kelvin
R = 0.08206 for those givens.
Equation
PV = n * R * T
Solve
1.01 * 45 = n * 0.08206 * 278
n = (1.01 * 45) / (0.08206*278)
n = 1.99
How does oxygen inhaled through the lungs enter the bloodstream. A. Through the nerves. B. Through the alveoli. C. Through the atrium. D. Through the epiglottis
Through the alveoli, oxygen inhaled through the lungs enter the bloodstream.
What is the definition of the respiratory system?The respiratory system is a biological system consisting of certain organs and structures used for gas exchange in animals and plants. The anatomy and physiology that cause it to vary greatly depending on the size of the organism, the environment in which it lives, and its evolutionary history. In terrestrial animals, the respiratory surface is inserted into the mucous membranes of the lungs. Gas exchange in the lungs takes place in millions of tiny air sacs; in mammals and reptiles, they are called alveoli and in birds atrium. These microscopic air sacs have a very rich circulation, which brings the air into close contact with the blood.
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A student made the Lewis dot diagram of a compound as shown.
Mg is written with two dots shown on its top. Cl is written on the right side of Mg. Cl has seven dots around it. An arrow is shown from one dot on Mg toward the vacant space around Cl. Another arrow is shown from the other dot on Mg toward the vacant space around Cl. On the top, the art title is written as Students Lewis Dot Model.
What is the error in the Lewis dot diagram? (3 points)
Another Cl should be shown around Mg that will transfer its unpaired electron to Mg.
The number of dots around Mg should be one because there is only one Cl around Mg atom.
Another Cl should be shown around Mg that will receive the second electron on Mg.
The number of dots around Cl should be six because it is receiving two electrons from Mg.
Answer: Another Cl should be shown around Mg that will transfer its unpaired electron to Mg.
Explanation:
A student measured out 0.333 moles of theobromine, CyH3N402 (MM = 180.8/mol) the
primary alkaloid found in chocolate. How many molecules of theobromide did the
student measure
Answer
2.0 x 10²³ molecules.
Explanation
Given:
The number of moles of theobromide measured out = 0.333 moles.
MM of theobromide = 180.8 g/mol
What to find:
The number of molecules of theobromide the student measured.
To go from moles to molecules, multiply the number of moles by Avogadro's number.
The Avogadro's number = 6.02 x 10²³
1 mole of theobromide contains 6.02 x 10²³ molecules.
So, 0.333 moles of theobromide measured out will have (0.333 x 6.02 x 10²³) = 2.0 x 10²³ molecules.
If 2 L of gas has a pressure of 6 atm at 27⁰C. what is the temperature in Celsius if the pressure is decreased to 2.5 atm and the volume is changed to 0.66L?
3.7 degree celsius
Explanations:According to ideal gas equation;
[tex]\frac{P_1V_1}{T_1}=\frac{P_2V_2}{T_2}[/tex]where:
• P1 and P2 are the initial and final pressure
,• V1 and V2 are the initial and new volume
,• T1 and T2 are the initial and final temperature
Given the following parameters
[tex]\begin{gathered} P_1=6atm \\ V_1=2L \\ T_1=27^0C \\ P_2=2.5atm \\ V_2=0.66L \end{gathered}[/tex]Required
Final temperature T2
Substitute
[tex]\begin{gathered} T_2=\frac{P_2V_2T_1}{P_1V_1} \\ T_2=\frac{2.5\times0.66\times27}{6\times2} \\ T_2=\frac{44.55}{12} \\ T_2\approx3.7^0C \end{gathered}[/tex]Therefore the new temperature in Celsius is 3.7 degree celsius
How much faster does ²³⁵UF₆ effuse than ²³⁸UF₆?
²³⁵UF₆ effuse 1.0042 times faster than ²³⁸UF₆.
The expression for rate of effusion of two gases can be define as follows :
Effusion Rate A / Effusion Rate B = [tex]\sqrt{Mb / Ma}[/tex]
now we have to calculate the molar masses of the given :
molar mass of ²³⁵UF₆ = 235 + 6(19) = 349 g/mol
molar mass of ²³⁸UF₆ = 238 + 6(19) = 352 g /mol
now substituting the values in the formula : we get,
Rate ²³⁵UF₆ / Rate ²³⁸UF₆ = [tex]\sqrt{352 / 349}[/tex] = 1.0042
Therefore , the Rate ²³⁵UF₆ effuses 1.0042 times faster than ²³⁸UF₆.
Thus, ²³⁵UF₆ effuse 1.0042 times faster than ²³⁸UF₆.
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What step comes after the observation stage in the scientific method?
• asking questions about the observation
• interpreting data
• writing a theory
• publishing your results
The step comes after the observation stage in the scientific method
asking questions about the observation.What is scientific method?The scientific method is the process of objectively establishing facts through testing and experimentation. The basic process involves making an observation, formulating a hypothesis, making a prediction, conducting an experiment and finally analysing the results.
7 steps of the scientific methods are
Make an observation. Ask a question. Form a hypothesis or testable explanation. Make a prediction based on a hypothesis. Test prediction. Iterate: Use the results to make new hypotheses or predictions.To learn more about scientific method, refer;
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What happens in a single-replacement reaction?
A single replacement reaction, also known as a single displacement reaction, occurs when one element in a molecule is swapped out for another. Starting ingredients are always pure elements combined with an aqueous compound, such as pure hydrogen gas or zinc metal.
Two pure elements and one aqueous compound or solution are required for all single-replacement reactions. The A and C in the aforementioned reaction would be pure elements. Zn + 2HCl > ZnCl2 + H2 is an example of a single-replacement reaction in detail.
You must make use of a "Activity Series" table to ascertain whether a certain single replacement will take place. A single displacement reaction will take place if the metal or halogen is above the element it would replace according to the activity series.
In a compound, one element takes the place of another to create a new material. The number of reactants and products in a single replacement reaction is equal.
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A 0.032 mole sample of gas is contained in a 1 L container at 23 degrees Celsius. What is the pressure of the gas?
Ideal gas law is valid only for ideal gas not for vanderwaal gas. The pressure of 0.032 mole sample of gas is contained in a 1 L container at 23 degrees Celsius is 0.77atm.
What is ideal gas equation?
Ideal gas equation is the mathematical expression that relates pressure volume and temperature.
Mathematically,
PV=nRT
where,
P = pressure=?
V= volume=1 L
n =number of moles= 0.032 mol
T =temperature = 23°C=296K
R = Gas constant = 0.0821 L.atm/K.mol
P × 1 L = 0.032mole× 0.0821 L.atm/K.mol × 296K
P =0.77atm
Therefore, the pressure of 0.032 mole sample of gas is contained in a 1 L container at 23 degrees Celsius is 0.77atm.
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4. Write an equilibrium equation for the following:
A. H₂ +F₂ <-----> 2HF
B. MnO₂ + 4HCI <-----> MnCl₂ + Cl₂ + H₂O
The equilibrium expressions are written for the reactions as;
a) K =[HF]^2/[H₂] [F₂]
b) [MnCl₂] [Cl₂] [H₂O]/[MnO₂] [HCI]^4
What is the equilibrium expression?Let us note that many times it is important to see the extent to which the reactant are converted into products. The value that shows us how much the reactants are converted into products is what we call the equilibrium expression.
Given this, the equilibrium has to do with the ratio of the products to that of the reactants. In this case, we can see that the equilibrium position can be written as the ratio of the amounts of the reactants to the products raised to the power of the stoichiometric coefficients of the species involved.
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The Radium Girls experienced devastating health outcomes from ingesting radium from their paint brushes.
We know that both radium and calcium will concentrate in our bones. Why might this be, and why might
radium be damaging to our bones while calcium is not?
Choose ALL correct answers.
A Radium and calcium will both form 2+ cations but radium is more reactive and more unstable.
B Radium and calcium will both form 2+ anions but radium is more reactive and more unstable.
C Calcium and radium are period 2 elements. Both will concentrate in our bones due to their similar
chemical properties.
D Calcium and radium are group 2 elements. Both will concentrate in our bones due to their similar
chemical properties.
Both radium and calcium will concentrate on our bones. Suitable statements are A and D Calcium and radium are group 2 elements. Both will concentrate on our bones due to their similar chemical properties.
Radium and calcium are alkaline earth metals, meaning they proportion a number of equal chemical homes due to each in their atom's outer shells containing two valence electrons. although radium is radioactive and calcium isn't, the frame can't distinguish among these factors that appear to act in an identical manner.
The paint contained radium. even as radium is only faintly radioactive, the women were informed to lick their paintbrushes to present the finer points. This led to complaints that had been influential in the early levels of workplace safety law within the U.S.
Young ladies painted face dials with radioactive fabric. Unaware that the paint turned into dangerous, they would locate the brush tip on their lips to acquire a nice point. After being laid low with radium poisoning, numerous younger girls sued their employers and brought national attention to the safety of people.
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[tex] \huge \color{basic}{ \boxed{ \tt{✐Answer:}}}[/tex]
The Radium Girls experienced devastating health outcomes from ingesting radium from their paint brushes. We know that both radium and calcium will concentrate in our bones. Why might this be, and why might radium be damaging to our bones while calcium is not?
Choose ALL correct answers.
☑︎ A. Radium and calcium will both form 2+ cations but radium is more reactive and more unstable.
☐ B. Radium and calcium will both form 2+ anions but radium is more reactive and more unstable.
☐ C. Calcium and radium are period 2 elements. Both will concentrate in our bones due to their similar chemical properties.
☐ D. Calcium and radium are group 2 elements. Both will concentrate in our bones due to their similar chemical properties.
________________________________
The correct answer is letter [tex] \large \bold{A}[/tex]
1. SEP Develop Models Use the space to create a model of the investigative
phenomenon. As you develop your model, consider the following:
• Why are fireworks different colors? What features of the atomic structure
might be part of the reasoning? How is light made or moved?
• Your model does not need to include every feature of the phenomenon.
Instead, focus on the features that you think are important for explaining
how or why the phenomenon occurs.
•
Use labels to identify and differentiate the components of your model.
.
Choose an appropriate scale for the model. If needed, label any specific
dimensions or measurements.
An atom is a complicated configuration of negatively charged electrons grouped around a positively charged nucleus in certain shells. Protons and neutrons make up the majority of the atom's mass in this nucleus (except for common hydrogen which has only one proton).
Fireworks' vibrant colors come from mineral components. Bright greens are produced by barium, deep reds by strontium, blues by copper, and yellow by sodium.
What is Atomic structure ?For instance, the nucleus of hydrogen is made up of a positively charged proton and a negatively charged electron. On the periodic table of elements, the atomic structure is also depicted.Protons, electrons, and neutrons are the three fundamental particles that make up an atom. The protons (positively charged particles) and neutrons are found in the nucleus (center) of an atom (no charge). The electrons are located in the outermost portions of the atom, which are known as the electron shells (negatively charged).Types ;
The atomic theory of John Dalton.model for plum pudding.Atomic model proposed by Rutherford.Atomic model proposed by Bohr.Atomic Model Based on Quantum Mechanics and the Electron Cloud.The quantum mechanical atomic model is basic description:To know more about Atom please click here ; https://brainly.com/question/6258301
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Study the reactions.What factor would only affect the rate of the third reaction.
Answer
The surface area of the reactants.
Explanation
The reactants of reaction III exists in both solid and liquid states, when solids and liquids react, increasing the surface area of the solid will increase the reaction rate. A decrease in particle size causes an increase in the solid’s total surface area.
Therefore, the only factor that would affect only the third reaction is:
The surface area of the reactants.
The last option is the correct answer.
Only this one question don’t need to write an entire goddam 15 sentences but just give me a correct answer
Thanks a lot
Answer:
All atoms of an element have the same number of protons, and every element has a different number of protons in its atoms. For example, all helium atoms have two protons, and no other elements have atoms with two protons
Explanation:
plus dude good luck can't believe people still do school work at this time.
Which of the following are gamma rays NOT used for?`A. None of theseB. Industrial imagingC. Medical imagingD. Sterilization
Answer
A. None of these
Explanation
Gamma rays are ionizing electromagnetic radiation, obtained by the decay of an atomic nucleus. Gamma rays are more penetrating, in the matter, and can damage living cells to a great extent. Gamma rays are used in medicine (radiotherapy), industry (sterilization and disinfection), and the nuclear industry.
Thus, gamma rays are used for all the options given in B - D. So the correct answer is option A. None of these
What is the molarity of a solution composed of 0.171 moles of HCl in 0.300 L of solution?A. 0.051b. 0.570 MC. 1.75 Md. 0.471 MWhat is the answer ?
In this question we are given the mols of HCl as 0.171 mols and the volume of the solution id 0.300L
we are required to find the molarrity of the solution.
molarity can by found by the equation
M = n/V
were M is Molarity and n is number of molds and V is the volume of the solution.
so the answer is
M =0.171/0.300
= 0.570 M
The mole fraction of iron(II) bromide, FeBr2, in an aqueous solution is 6.15×10-2. The percent by mass of iron(II) bromide in the solution is what %?
First, let's put the info into symbols:
[tex]\begin{gathered} X_{FeBr_2}=\text{ 6.15*10}^{-2} \\ \end{gathered}[/tex]As the mole fractions have to add up to 1, we can calculate the water mole fraction, substracting:
[tex]X_{H_2O}=\text{ 1-6.15*10}^{-2}=0.9385[/tex]If we make the supposition that we have 1 mole of the solution, we would have the next quantities of each substance:
[tex]6.15*10^{-2}\text{ moles of FeBr}_2\text{ and 0.9385 moles of water. }[/tex]Now, we can convert these moles into mass through the molecular weight of each substance:
[tex]\begin{gathered} M.W\text{ of water: 2*1+16=18 g/mole} \\ M.W.\text{ of iron \lparen II\rparen bromide: 56+80*2=216 g/mole} \\ \\ 6.15*10^{-2}moles\text{ FeBr}_2*\frac{216\text{ g}}{1\text{ mole}}=\text{ 13.284 g FeBr}_2 \\ \\ 0.9385\text{ moles H}_2O\text{ * }\frac{18\text{ g}}{1\text{ mole}}=16.893\text{ g H}_2O \end{gathered}[/tex]Now, we can calculate the mass percentage, because we have the mass of the substrate and the mass of the solution (the addition of water and iron (II) bromide):
[tex]\%\text{ m/m FeBr}_2=\frac{13.284\text{ g}}{13.284g+16.893g}*100=44.020\text{ \% m/m}[/tex]The answer is that the %m/m of iron bromide in the solution is 44.020%
True or False *hint 3 Trues and only 1 false*
True or false, Meiosis starts with half the number of chromosomes as Mitosis.
True or false, the genetic offspring are exactly like the parent call.
True or false, there are 23 chromosomes from each parent cell.
True or false, meiosis goes through 2 stages of division, meiosis i and ii.
Meiosis starts with half the number of chromosomes as Mitosis = True
The genetic offspring are exactly like the parent call = False
There are 23 chromosomes from each parent cell = True
Meiosis goes through 2 stages of division, meiosis i and ii = True
---------------------------------------------------
Hope this helps!
Have a great day and God bless! :)
polyester is made by reacting which two chemicals?- acid and ester - acid and ketone - aldehyde and ketone- acid and alcohol
Let me explain this question using the following picture:
As you can notice, a polyester is formed when an acid and alcohol react together.
Therefore, the answer is acid and alcohol.
A solution of 2.95 g of solute dissolved in 25.0 mL of H2O at 25°C has a boiling point of 100.300°C. What is the molar mass of the solute if it is a nonvolatile nonelectrolyte and the solution behaves ideally (d of H2O at 25°C = 0.997 g/mL)?
To solve this we must know the concept behind the phenomenon of elevation in boiling point when a non volatile solute is added to any solvent, the molar mass of solute is 115.40g
What is elevation in boiling point ?Whenever a non volatile solute is added to a solvent then the boiling point of solvent increases
Mass of solution = volume× density
= 25.0 mL×0.997 g/mL
=24.925g
= 0.024Kg
ΔT= Kb× molality
100.300-100=0.512×m
0.58=m
0.58×0.024=mole
0.013=mole
mass =given mass÷ mole
= 1.50÷0.013
= 115.40g
Thus the molar mass of solute is 115.40g
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