Answers
Answer: o solve this problem, we need to use the equation for the rate of a chemical reaction with a single reactant:
rate = k[reactant]
where k is the rate constant, [reactant] is the concentration of the reactant, and rate is the rate of the reaction.
The goal of the problem is to determine how long it takes for the reaction to be 72.6% complete. We can express this as a percentage of the reactant being consumed: 100% - 72.6% = 27.4% of the reactant remains.
We can rearrange the rate equation to solve for time:
time = (1/rate) * (1 - (27.4/100))
Substituting in the given values, we have:
time = (1/0.1161 s-1) * (1 - (27.4/100))
= 8.66 s
Therefore, it takes approximately 8.66 seconds for the reaction to be 72.6% complete.
Note: It is important to make sure to use consistent units when solving this problem. In this case, the rate constant is given in seconds, so the time unit should also be in seconds.
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Related Questions
An object is a regular, rectangular, solid with dimensions of 2 cm by 3cm by 2cm. It has a
mass of 24 g. Find its density.
Answers
Answer:
2
Explanation:
Density = mass/volume
m=24
v=2*3*2=12
24/12=2
Answer:
\(\boxed {\tt d= 2 \ g/cm^3}\)
Explanation:
Density can be found using the following formula.
\(d=\frac{m}{v}\)
where \(m\) is the mass and \(v\) is the volume.
We know the mass is 24 grams. We must find the volume.
Since it is a rectangle, the volume can be found using the following formula.
\(v=l*w*h\)
The length is 2 centimeters, the width is 3 centimeters and the height is 2 centimeters.
\(v= 2 \ cm * 3 \ cm * 2\ cm\)
\(v= 6 \ cm^2 * 2\ cm\)
\(v= 12 \ cm^3\)
Now we know the volume, and can substitute it into the density formula.
\(d=\frac{m}{v}\)
\(m= 24 \ g\\v= 12 \ cm^3\)
\(d=\frac{24 \ g}{12 \ cm^3}\)
\(d= 2 \ g/cm^3\)
The density is 2 grams per cubic centimeter.
The figure below shows the rotation curves of several spiral galaxies, extending to the very edge of their visible disks. What do these curves tell us about the distribution of dark matter in these galaxies?
Group of answer choices
Most of the dark matter is in the bulge.
Most of the dark matter is in the galaxies’ outskirts.
Most of the dark matter is near stars.
Most of the dark matter is in clumps.
Answers
The thing that the curves tell us about the distribution of dark matter in these galaxies is option B: Most of the dark matter is in the galaxies’ outskirts.
Why do galaxy rotation curves suggest the existence of dark matter?Beyond the visible borders of galaxies, the velocity of stars remains relatively constant, suggesting that there must be more matter present than what we can see as stars and gas.
When the impact of DE became noticeable, the rotation curves are shown to dip at a specific distance. r. These flat, v = constant, rotation curve data suggest that the amount of dark matter is increasing linearly with r up to great distances from the spiral galaxies' centers.
From the graph you can see they all pointing or going one direction, hence we can deduce that it is option B.
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Question 2 of 10
You read a primary source and a secondary source that discuss the same
experiment. There is a difference in the conclusions made by these two
sources. Which should you trust more, and why?
OA. The primary source, because it was written by the researcher
OB. The primary source, because it contains more charts
OC. The secondary source, because it was printed on paper
OD. The secondary source, because it is easier to understand
SUBMIT
Answers
It is the primary source which helps the students to relate in a personal way to events of the past and promote a deeper understanding of history as a series of human events. The primary source is better, because it contains more charts. The correct option is B.
The sources which are closest to the origin of the information and contain raw information which must be interpreted by the researches are called the primary sources. The secondary sources are closely related to the primary sources and often interpret them.
A direct access to the subject of our research is given by the primary source whereas the secondary source provides only second hand information and comments of other researches.
Thus the correct option is B.
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If an insufficient amount of liquid unknown had been used, how would this have effected the value of the experimental molar mass
Answers
Answer:
Actual yield reduces the more.
Explanation:
An actual yield of the course of a chemical reaction is the mass of a product actually obtained from the reaction.
In practice you see it and It is usually less than the theoretical yield.
Various reasons may come up to explain this away but here is one:
• incomplete reactions, simply put here some of the reactants do not react to form the product.
The same applies in the question about the actual yield will reduce significantly in molar mass now that insufficient amount of reagent are used.
500.0 liters of a gas in a flexible-walled container are prepared at 0.92 atm and 473K. The gas is placed into a tank under high pressure. When the tank cools to 293K, the pressure of the gas is 3.0 atm. What is the volume of the gas?
P1V 1 T2=P 2 V 2 T 1
Question 17 options:
48 L
248 L
19 L
95 L
Answers
The volume of the gas in the tank at 293K and 3.0 atm pressure is 248 L. Hence, option B is correct.
Given:
T1 = 473K
T2 = 293K
P1 = 0.92 atm
P2 = 3.0 atm
The ideal gas law equation is:
PV = nRT
where P is pressure, V is volume, n is the number of moles of gas, R is the universal gas constant, and T is temperature.
n1 = (PV)/(RT)
= (0.92 atm × 500.0 L)/(0.0821 Latm/molK × 473K)
= 10.42 mol
Use the ideal gas law again to find the final volume of the gas in the tank under high pressure:
V2 = (n1 × R × T2)/P2
= (10.42 mol × 0.0821 Latm/molK × 293K)/(3.0 atm)
= 248 L
Therefore, the volume of the gas in the tank at 293K and 3.0 atm pressure is 248 L.
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Answer:
Using the ideal gas law, PV=nRT, where P is pressure, V is volume, n is the number of moles, R is the gas constant, and T is temperature in Kelvin, we can solve for n:
n = PV/RT
We know that the initial volume is 500.0 L, pressure is 0.92 atm, and temperature is 473K. We can use this information to find the initial number of moles:
n1 = (0.92 atm x 500.0 L)/(0.08206 L atm/mol K x 473K) = 11.80 mol
Next, we can use the ideal gas law again to find the final volume. We know that the final pressure is 3.0 atm and the final temperature is 293K:
V2 = nRT2/P2
V2 = (11.80 mol x 0.08206 L atm/mol K x 293K)/3.0 atm = 95 L
Therefore, the volume of the gas at the lower temperature and higher pressure is approximately 95 L. Answer: 95 L.
Consider an element Z that has two naturally occurring isotopes with the following percent abundances: the isotope with a mass number of 19.0 is 55.0% abundant; the isotope with a mass number of 21.0 is 45.0% abundant. What is the average atomic mass for element Z?
Average atomic mass of Z = [mass]
Answers
Answer:
Average atomic mass = 19.9 amu
Explanation:
Isotopes can be defined as two or more forms of a chemical element that are made up of equal numbers of protons and electrons but different numbers of neutrons.
Generally, the isotopes of a chemical element have the same chemical properties because of their atomic number but different physical properties due to their atomic weight (mass number).
Given the following data;
Relative abundance of Z-19 = 55%
Relative abundance of Z-21 = 45%
Atomic mass of Z-19 = 19 amu
Atomic mass of Z-21 = 21 amu
To find the average atomic mass;
Average atomic mass = 19 * (55/100) + 21 * (45/100)
Average atomic mass = 19*0.55 + 21*0.45
Average atomic mass = 10.45 + 9.45
Average atomic mass = 19.9 amu
Therefore, the average atomic mass for element Z is 19.9 amu.
A plum with a mass of 35 g contains 30 Cal of nutritional energy. How many plums should a person consume to get
120 Cal of energy
Answers
1cal —> 7/6g
120cal — 140g
Therefore, A person should eat 140gm of plums
If a Plum with a mass of 35 g contains 30 Cal of nutritional energy, then a person should consume four plums to get 120 Cal of energy.
What is multiplication?Finding the product of two or more numbers in mathematics is done by multiplying the numbers.
It is one of the fundamental operations in mathematics that we perform on a daily basis.
As given in the problem If a Plum with a mass of 35 g contains 30 Cal of nutritional energy, then we have to find out a person should consume how much plums to get 120 Cal of energy.
30 cal of nutritional energy = 1 plum
1 cal of nutritional energy = 1/30 plums
120 cal of nutritional energy = 120/30 plums
= 4 plums
Thus, a person should consume four plums to get 120 Cal of energy.
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Which portion of a molecule of F2O has partial positive charge?
Question 3 options:
A)
The F atoms
B)
The central O atom
C)
The partial charge on each atom is zero
D)
The partial charge on each atom is negative
Answers
The partial charges on each fluorine atom are negative. Option B) The central O atom is the correct answer. Option B
The partial charges in a molecule are determined by the electronegativity values of the atoms involved. Electronegativity is the ability of an atom to attract electrons towards itself in a chemical bond. In the case of \(F_2O\), fluorine (F) is more electronegative than oxygen.
Fluorine is the most electronegative element on the periodic table, meaning it has a high ability to attract electrons. Oxygen is also relatively electronegative but less so than fluorine. When fluorine atoms bond with oxygen, the shared electrons will be pulled more towards the fluorine atoms, creating a polar covalent bond.
In \(F_2O\), each fluorine atom will pull the shared electrons towards itself, resulting in a higher electron density around the fluorine atoms. This creates a region of partial negative charge around the fluorine atoms.
Conversely, the oxygen atom will have a region of lower electron density and, therefore, a partial positive charge. This is because the shared electrons spend more time around the fluorine atoms due to their higher electronegativity.
Option B
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Identify the major ionic species present in an aqueous solution of C6H12O6 (glucose).
A. 6 C-
, 12 H+
, 6 O–
B. 6 C+
, 12 H+
, 6 O2–
C. 6 CH2+, 6 O2–
D. C6
+
, 12 H+
, 6 O2–
E. no ions are present
Answers
Glucose is a molecular substance therefore, there are no ionic species in glucose.
Ionic substances dissolve in water to yield ions. Molecular substances do not produce ions in solution. The conductivity of ionic solutions owes to the presence of ions in solutions. Molecular solutions do not conduct electricity due to the absence of ions.
Glucose is a molecular substance hence they are are no ions present hence glucose does not conduct electricity.
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You have a mixture of salt, sand, iron fillings, and large rocks in a big bucket. Your goal is to separate the four different items into their own bucket. Write a detailed procedure showing the step by step process on to separate each item.
Answers
Answer:Please see answers in the explanation column
Explanation:
In a mixture of salt, sand, iron fillings, and large rocks in a big bucket.
The process of separation is as follows:
Ist step ---
Use of magnet : Because Irons are attracted to magnet, Introducing a magnet to the mixture will cause the iron fillings to cling to the magnet leaving the other constituents behind
2nd Step
we eliminate the large rocks by carefully Sorting or picking them out since they are large and visible or we use a MESH or Sieve and carry out the separation by pouring the rock, salt and sand mixture on top of the mesh with continuous shaking so as to filter the smaller particles,The smaller particles will pass through the mesh while the bigger rocks remains on top.
3rd Step
We are left with the salt and sand. we will then introduce water to mix the salt and sand. salt dissolves completely in water while the sand settles as the bottom of the container. We can then separate the sand by decantation and then filtration to remove any left over sand.
4th step
Evaporation is then carried out on the salt solution to separate the salt from water.
I have an experiment on a mouse, and this experiment includes arsenic ... but I don't know where to buy it. Please help me. What are the characteristics of arsenic? Please help
Answers
Answer:
Arsenic is a semi-metal. In its metallic form it is bright, silver-grey and brittle. Arsenic is a well-known poison. Arsenic compounds are sometimes used as rat poisons and insecticides but their use is strictly controlled.
Explanation:
1.Calculate the frequency of a chemical shift at 1.25 ppm using a 400 MHz NMR spectrometer.A)1500 HzB)450 HzC)320 HzD)500 Hz
Answers
Answer:
D
Explanation:
Chemical shift is given as
Frequency/frequency of instrument
Let c = chemical shift
F = frequency
I = frequency of instrument
Chemical shift = frequency/frequency Instrument
1.25ppm = Frequency /400
We cross multiply to find frequency
Frequency = 400 x 1.25
Frequency = 500Hz
Option d is the answer since it is 500hz
how to synthesize 2-benzyl pentanoic acid from acetoacetic ester?
Answers
If you're attempting to synthesize 2 benzyl pentanoic acid from acetoacetic ester, keep in mind that you can do so fairly quickly by following these simplified instructions:
Begin by dissolving your acetoacetic ester into anhydrous diethyl ether and adding benzyl bromide and sodium hydroxide to the mix. Stir it all together at room temperature for around thirty minutes before reacting it with hydrochloric acid so that any remaining solvent evaporates out of your crude mixture; Lastly refine your creation by recrystallizing it from ethanol until you have pure 2 benzyl pentanoic acid.What is acetoacetic ester?From its pungent free scent to its solid state at temperatures ranging from 118 120°C, acetoacetic ester (better known as ethyl acetoacetate) offers significant value for those working within organic synthesis.
As one of many potent ketones utilized by researchers around the globe its unique properties make it ideal for building complex molecules essential for modern medicine and more.
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738.90 m has ____ significant figures
Answers
Answer: 4
Explanation: because the zero doesn't count
A volume of 50.0 mL of aqueous potassium hydroxide ( KOH ) was titrated against a standard solution of sulfuric acid ( H2SO4 ). What was the molarity of the KOH solution if 25.7 mL of 1.50 M H2SO4 was needed? The equation is2KOH(aq)+H2SO4(aq)→K2SO4(aq)+2H2O(l)
Answers
Answer
The molarity of the KOH = 1.542 M
Explanation
The given parameters are:
Volume of KOH, Vb = 50.0 mL
Volume of H2SO4, Va = 25.7 mL
Molarity of H2SO4, Ca = 1.50 M
Equation: 2KOH(aq) + H2SO4(aq) → K2SO4(aq) + 2H2O(l)
From the equation, the mole ratio of KOH to H2SO4 = 2:1, that is na = 1 and nb = 2
What to find:
The molarity of the KOH, Cb.
Step-by-step solution:
The molarity of the KOH, Cb can be calculated using the formula below:
\(\begin{gathered} \frac{C_aV_a}{n_a}=\frac{C_bV_b}{n_b} \\ \\ C_b=\frac{C_a\times V_a\times n_b}{n_a\times V_b} \end{gathered}\)Substituting the values of the parameters into the formula, we have
\(\begin{gathered} C_b=\frac{1.50M\times25.7mL\times2}{1\times50.0mL} \\ \\ C_b=\frac{77.1M}{50.0} \\ \\ C_b=1.542\text{ }M \end{gathered}\)Thus, the molarity of the KOH is 1.542 M
How much did asbestos exposure decrease during the year 1982 and 1983
Answers
The asbestos exposure during the years 1982 and 1983 was 2.5 fibers per cubic centimeter and 0.8 fibers per cubic centimeter respectively. So asbestos exposure decreased by 1.7 fibers per cubic centimeter during the year 1983.
Breathlessness Persistent, dry cough Chest pain or tightness Lack of a dry, crackling sound in the lungs when you breathe in Wider and rounder fingers and toes are some of the symptoms of asbestos exposure.
The largest group of people exposed to asbestos is those working in the construction industry. Historically, asbestos was also used by pipe fitters and shipyard workers. In addition, asbestos was used by military personnel, auto mechanics, and many other occupations.
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Which type of decomposer can produce chemicals that are harmful to plants?
O aerobic microorganisms
O earthworms
O centipedes
O anaerobic microorganisms
Answers
What could have been done to slow down the rate of the chemical reaction besides the
size of the particles or temperature?
Answers
An inhibitor is a substance that lowers the pace of a chemical process. Food is preserved through the use of preservatives, which act as inhibitors.
Is a response an answer?A response is a movement, a propensity, or an action that is done in the opposite way. Impulsive actions are taken without much thinking or consideration of the potential consequences. Response: Making a statement in response to an action or a statement.
What are some instances of reactions?Changes in color, temperature, gas generation, or precipitant formation are common during chemical reactions. Digestion, combustion, and cooking are a few basic examples of daily reactions.
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When NH3(g) reacts with O2(g) to form N2O(g) and H2O(l) , 342 kJ of energy are evolved for each mole of NH3(g) that reacts. Write a balanced thermochemical equation for the reaction with an energy term in kJ as part of the equation. Note that the answer box for the energy term is case sensitive. Use the SMALLEST INTEGER coefficients possible and put the energy term (including the units) in the last box on the appropriate side of the equation. If a box is not needed, leave it blank.
Answers
Answer:
2 NH₃(g) + 2 O₂(g) ⇒ N₂O(g) + 3 H₂O(l) ΔH° = -684 kJ
Explanation:
Let's consider the unbalanced equation that occurs when NH₃(g) reacts with O₂(g) to form N₂O(g) and H₂O(l).
NH₃(g) + O₂(g) ⇒ N₂O(g) + H₂O(l)
We will begin balancing N atoms by multiplying NH₃(g) by 2.
2 NH₃(g) + O₂(g) ⇒ N₂O(g) + H₂O(l)
Then, we will balance H atoms by multiplying H₂O(l) by 3.
2 NH₃(g) + O₂(g) ⇒ N₂O(g) + 3 H₂O(l)
Finally, we will get the balanced equation by multiplying O₂(g) by 2.
2 NH₃(g) + 2 O₂(g) ⇒ N₂O(g) + 3 H₂O(l)
Since 342 kJ of energy are evolved for each mole of NH₃(g), and there are 2 moles of NH₃(g) in the balanced equation, the heat evolved will be2 × 342 kJ = 684 kJ. By convention, when heat is evolved, it takes a negative sign. The balanced thermochemical equation is:
2 NH₃(g) + 2 O₂(g) ⇒ N₂O(g) + 3 H₂O(l) ΔH° = -684 kJ
To vaporize/condense a substance, does the substance have to absorb or release heat?
Answers
Answer: it would release heat because the thermal energy it absorbed to become a gas. so it would release heat. hope this helps :)
Explanation:
Higher temperatures tend to increase the rate of a chemical reaction because
a. the particles have greater momentum and therefore have higher energy collisions.
b. the particles are more likely to behave as a catalyst and lower the activation energy.
c. the particles move faster and therefore collide more often.
d. the particles have greater attractions and therefore collide with the correct orientation.
Answers
Answer:
b
Explanation:
Higher temperatures tend to increase the rate of a chemical reaction because the particles move faster and therefore collide more often.
What is rate of reaction?Rate of reaction tells about the speed of the reaction or at what duration of time a reaction gets completed.
When we increases the temperature of any chemical reaction, then the kinetic energy of the molecules increases, due to which they move fast in the chemical reaction. Due to this random and fast movement molecules get collide with each other rapidly and easily form the product.
Hence option (c) is correct i.e. particles move faster and therefore collide more often when temperature increases.
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What type of reaction is C3H6O + O2 --> CO2 + 3 H2O
Answers
Answer:
Combustion of propanone I believe
Explanation:
Which is the correct formula for finding the frequency of an electromagnetic wave? f = c – lambda f = StartFraction lambda over c EndFraction. f = lambda + c f = StartFraction c over lambda EndFraction.
Answers
Answer: It's D
Explanation:
Answer:
the answers d if you give brainliest give it to the other person im not worthy of it
Explanation:
Which amphibian organ has a high blood supply and many folds to increase surface area?
a. heart
b. stomach
c. lungs
d. brain
Answers
Answer:
lungs
Explanation:
Looking at atoms in the same valence energy level, what factor affects Coulombic attraction?A) number of protonsB) distance from the nucleusC) moles of atomsD) numbers of neutrons
Answers
Option - A:Among the options given, the factor that affects Coulombic attraction for atoms in the same valence energy level is the number of protons, represented by the atomic number of the atom.
The term "coulombic attraction" describes the electrostatic attraction between negatively charged electrons in the electron cloud around the nucleus and positively charged protons in the atomic nucleus. The number of protons in an element's nucleus determines its atomic number. Atoms with more protons have more positive charge, which attract the negatively charged electrons more powerfully.
The Coulombic attraction is also somewhat influenced by the distance from the nucleus, which is symbolised by the energy level of the electrons; the weaker the attraction is, the farther an electron is from the nucleus. Yet, as all atoms at the same valence energy level typically have the same distance from the nucleus, the attraction between them is not differentiated.
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A
Wind power has been beneficial to ranchers, farmers, and rural homeowners for
decades. Windmills and turbines use wind power to change the wind's kinetic energy
into electricity.
Where does the Earth's wind power come from?
mechanical energy¹
the water cycle
B
C
D
Answers
The Earth's wind power come from sun. It is the by product of solar energy.
What is wind energy?Wind power or wind energy is primarily generated using wind turbines. It is a popular sustainable and renewable energy source that has less environmental impact than burning fossil fuels. Wind or wind energy describes the process of using wind to generate mechanical power or electricity. During the day, air over land warms faster than air over water. Warm air on land expands and rises, and heavy cold air moves in and creates wind in its place. At night, the wind reverses direction. This is because air cools faster over land than over water.
It energy is actually a byproduct of the sun. The uneven heating of the atmosphere by the sun, the irregularities of the earth's surface (mountains and valleys), and the rotation of the planets around the sun combine to produce wind.
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Lewis Structure for NO3-
Answers
Answer::
Explanation::
Calculate the volume in mL of a 0.600 M NaCl solution that contains 0.00123 moles of NaCl.
Answers
The volume in of a 0.600 M NaCl solution that contains 0.00123 moles of NaCl is 2.05mL
How to calculate volume?The volume of a substance can be calculated using the following expression:
molarity = no. of moles ÷ volume
According to this question, a 0.600 M NaCl solution contains 0.00123 moles of NaCl.
volume = 0.00123 moles ÷ 0.600 M
volume = 0.00205L
Therefore, the volume in of a 0.600 M NaCl solution that contains 0.00123 moles of NaCl is 2.05mL.
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O
Aqueous magnesium nitrate
Mg(NO3)2(aq)
sodium
phosphate
Na3PO4(aq)
Write the balanced molecular equation, including phases, for the reaction of aqueous sodium phosphate with aqueous
magnesium nitrate.
Answers
The balanced molecular equation for the reaction of magnesium nitrate, Mg(NO₃)₂ and sodium phosphate, Na₃PO₄ is:
3Mg(NO₃)₂(aq) + 2Na₃PO₄(aq) → 6NaNO₃(aq) + Mg₃(PO₄)₂(s)
How do i write the balanced equation?The balanced molecular equation for the reaction of magnesium nitrate, Mg(NO₃)₂ and sodium phosphate, Na₃PO₄ can be written as illustrated below:
Mg(NO₃)₂(aq) + Na₃PO₄(aq) → NaNO₃(aq) + Mg₃(PO₄)₂(s)
There is 1 atom of Mg on the left side and 3 atoms on the right. It can be balanced by writing 3 before Mg(NO₃)₂ as shown below:
3Mg(NO₃)₂(aq) + Na₃PO₄(aq) → NaNO₃(aq) + Mg₃(PO₄)₂(s)
There is 1 atom of P on the left side and 2 atoms on the right. It can be balanced by writing 2 before Na₃PO₄ as shown below:
3Mg(NO₃)₂(aq) + 2Na₃PO₄(aq) → NaNO₃(aq) + Mg₃(PO₄)₂(s)
There are a total of 6 atom of Na on the left side and 1 atom on the right. It can be balanced by writing 6 before NaNO₃ as shown below:
3Mg(NO₃)₂(aq) + 2Na₃PO₄(aq) → 6NaNO₃(aq) + Mg₃(PO₄)₂(s)
Now, the equation is balanced.
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Using the reading "Fossil Fuels" from lesson 12 describe the environmental and economic benefits and drawbacks of fossil fuels. Second, looking over the benefits and drawbacks, in your opinion, what do you think will happen to mining of fossil fuels in the next 50 years?
Answers
Fossil fuels are essential part of the power generation in the world. They are easily combustible and more reliable and cheaper. However, the burning of fossil fuels releases toxic gases to the environment.
What are fossil fuels ?Fossil fuels are fuel generated from the decomposition materials. Petroleum, coal, natural gas etc. are fossil fuels which are excavating from the earth.
Fossil fuels are non-renewable sources of energy. Hence, as the existing fossil sources are exhausted no more fossil fuel can be made. It is cheaper, reliable and easy to use.
However, the toxic hydrocarbon gases released from the burning of fossil fuels make the environment polluted. Therefore, overuse of fossil fuel definitely rise the atmospheric pollution.
Its use over the next 50 years, will increase the global warming and more of it will be exhausted.
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