Explanation 2Al2O3(s)-->4Al(s)+302(g)What is the total number of moles of O2 that are produced when 8.0 mol of Al2O3(s)are totally decomposed ?
Which conditions produce the largest ocean waves?
Question 3 options:
strong winds that blow for a long time over a great distance
weak winds that blow for short periods of time with a short fetch
strong winds that blow for short periods of time with a short fetch
weak winds that blow for long periods of time with a long fetch
Answer:
Strong winds that blow for a long time over a great distance.
Explanation:
Generally, the biggest and most powerful wind-generated waves are produced by strong storms that blow for a sustained period over a large area. Huge and big waves, or swells, can travel over long distances. The size of the wave depends on wind speed, wind duration, and the area over which the wind is blowing. If The speed of the wind is more, it stays for along time and it covers a larger distance then the waves produced will be very powerful and large.
CaCl2 (s) + 2 H2O → Ca(OH)2 (aq) + 2 HCl (g) When Addie added CaCl2 to the water in her flask, she noted that the flask heated up. What conclusion can be drawn about the bond energy of products and reactants? A) More energy was absorbed in the formation of chemical bonds than released in the breaking of chemical bonds. B) Less energy was absorbed in the breaking of chemical bonds than released in the formation of chemical bonds. C) More energy was absorbed in the breaking of chemical bonds than released in the formation of chemical bonds. D) Less energy was absorbed in the formation of chemical bonds than released in the breaking of chemical bonds.
Answer: the answer is b
Explanation: the formation of bonds releases energy and the breaking of bonds always involves an absorption of energy
You have an isotope with 23 protons and 29 neutrons. What is the mass number?
Answer:
52
Explanation:
Mass number is the sum total of protons and neutrons in an element
Therefore, Mass number = protons + neutrons
Mass number = 23 + 29
Mass number = 52
Why do oxygen molecules move more slowly than hydrogen molecules at the same temperature?
Answer:The oxygen molecules are more loaded and heavier which weighs down and the molecules and don't allow the same amount of moving ability as the hydrogen moles have.
Explanation:
Fresh water is always (A)_____________________ than salt water so it (B)____________________ the salt water.
(a) less dense (b) rises above
(a) more dense (b) sinks below
3. Tom wants to make some copper oxide. Sally suggests he could make it by burning copper metal in air.
a) Why is Sally wrong?
Answer:
Because burning copper in air won't oxidize it you need to leave it in contact with air only
Explanation:
Carbon dioxide is a compound of the elements carbon and oxygen (CO2). What happened to the carbon and oxygen to create this compound?
A. they merged nuclei
B. they swapped protons
C. they combined neutrons
D. they exchanged electrons
Answer:
D. they exchanged electrons
Do lone pair electrons form covalent bonds YES or No
Answer:
yeslone pair of electrons form covalent bonds
Explanation:
Hope it helps you<3A sample of nitrogen (N2) has 1.70 moles and occupies 3.8 Liters. What would be the volume of the sample with 2.60 moles?
Answer:
a) What volume will it occupy with 2.60 moles?
V2 = V1 x n2 / n1
V2 = 3.80 x 2.60 / 1.70 = 5.81 L
Answer: V2 = 5.81 L
b) How many moles are in a sample that occupies 1.45 L?
n2 = n1 x V2 / V1 = 1.70 x 1.45 / 3.80 = 0.65 mol
Answer: n2 = 0.65 mol
Explanation:
The volume of the sample that has 2.60 moles and occupies is 5.81 l.
What is Volume?Volume is the space occupied by a three-dimensional object.
The moles of the sample m1 is 1.70
The volume V1 is 3.8 l
The moles m2 is 2.60
V2 = ?
[tex]V2 = V1 \times \dfrac{n_2}{n_1} \\\\\\V2 = 3.80 \times \dfrac{2.60}{1.70} = 5.81 \;l[/tex]
Thus, the volume of the sample that has 2.60 moles and occupies is 5.81 l.
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5. What are the correct coefficients in order for the equation to be balanced?
Explanation:
I hope you benefit from this
This is the correct coefficient...
Determine the pH of 1 x 10^-2 the NaOH.
a. 2.0
b. 4.0
c. 8.0
d. 12.0
Answer:
i hope the answer is 12.0
What trends do you see in these calculations? How does the percent increase that occurred from 2000 to 2010 compare with the projected increase from 2020 to 2030
Answer:
The early 2000s had an astronomical rise in wind energy. The largest rise, by far, was between 2000 and 2010, but it also increased by 51% in just three years between 2010 and 2013. Beyond 2020, wind energy is still expected to steadily increase, but not at the astronomical rate of the early 2000s.
Explanation:
Answer:
Wind energy witnessed a meteoric surge in the early 2000s. By far the most significant increase occurred between 2000 and 2010, but it also climbed by 51% in just three years from 2010 and 2013. Wind energy is predicted to continue to grow through 2020, although not at the same astronomical rate as in the early 2000s.
Explanation:
plato (not example answer)
Simplify the following expression
Answer:
[tex] \frac{ {a}^{2} }{ {b}^{2} \times c \times {e}^{7} } [/tex]
Hope it helps you.......
Which energy resource has the advantage of producing clean energy that is less harmful to the environment?
Coal being extracted from the ground.
Modern wind mills.
A man filling a car with gasoline.
Answer:
wind energy
Explanation:
Energy resource that has the advantage of producing clean energy that is less harmful to the environment is Modern wind mills.
What is Wind mill?A windmill is a machine structure that helps to convert wind power into rotational energy using wings called sails or blades, by tradition specifically to mill grain, but the term has also been extended to encompass windpumps, wind turbines, and other applications, in some parts of the English-speaking world.
Wind is a form of solar energy caused by a combination of three concurrent events:
The sun unevenly heating the atmosphere
Irregularities of the earth's surface
The rotation of the earth.
Given, options for Energy resource that has the advantage of producing clean energy that is less harmful are-
-Coal being extracted from the ground.
-Modern wind mills.
-A man filling a car with gasoline
Therefore, Energy resource that has the advantage of producing clean energy that is less harmful to the environment is Modern wind mills.
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100.00 mL of the 0.0250 M HNO3 solution by dilution of the 1.00 M HNO3
solution provided in the lab.
Taking into account the definition of dilution, the initial volume of the 1 M HNO₃ solution is 25 mL.
Definition of dilutionWhen it is desired to prepare a less concentrated solution from a more concentrated one, it is called dilution.
Dilution is the process of reducing the concentration of solute in solution, which is accomplished by simply adding more solvent to the solution at the same amount of solute.
In a dilution the amount of solute does not change, but as more solvent is added, the concentration of the solute decreases, as the volume (and weight) of the solution increases.
A dilution is mathematically expressed as:
Ci×Vi = Cf×Vf
where
Ci: initial concentrationVi: initial volumeCf: final concentrationVf: final volumeVolume requiredAssuming that you want to know the volume of HNO₃ required to produce the dilution, you know:
Ci= 1.00 MVi= ?Cf= 0.250 MVf= 100 mLReplacing in the definition of dilution:
1 M× Vi= 0.250 M× 100 mL
Solving:
Vi= (0.250 M× 100 mL)÷ 1 M
Vi= 25 mL
In summary, the initial volume of the 1 M HNO₃ solution is 25 mL.
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2 Fe + O2 + 3 Fe2O3
What type of reaction is this.
Answer:
This is a synthesis reaction or a combination reaction
can some one please help me with this question
Answer:
the atom structure in model A has more atoms and they are all the same type of atom while model B has less atoms and they are different types of atoms.
Explanation:
True or False: Venus has an average surface temperature
higher than that of Mercury.
The statement Venus has an average surface temperature higher than that of Mercury is true, because of the presence of the high amount of carbon dioxide.
What is surface temperature?Every body has outer surface and inner surface, so if we talk about the temperature of outer surface then we will use the word surface temperature.
As we know that carbon dioxide is a green house gas, it means this gas increase the temperature by trapping the heat content. In the Venus atmosphere high amount of carbon dioxide is present and this atmosphere traps the heat coming from the sun and have a higher surface temperature as compare to Mercury. Because in Mercury atmosphere is absent.
Hence, given statement is true.
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Calculate the moles of Fe in 4.95x 1022 atoms of Fe .
Answer:
I’m guessing that you mean 4.95x 10^22,
3074.31 moles
Explanation:
(4.95x10^22) grams x (1) mole (6.02x10^23) grams
You cancel you the grams and then you have solved it for moles
tungsten (IV)thiosulfate
What is the formula?
Answer:
The formula of Tin (IV) Thiosulfate is Sn(S₂O₃)₂
-TheUnknownScientist 72
earth's atmosphere is approximately 78% nitrogen and 21% oxygen. what is the mass in grams of oxygen in a cubic meter of air in a typical classroom at 1 atm and 25C (1m^3=1000L)
With the earth's atmosphere at approximately 78% nitrogen and 21% oxygen, we have that the mass in grams of oxygen is mathematically given as
Mass of O2=2.74.7g
What is the mass in grams of oxygen?Question Parameters:
Earth's atmosphere is approximately 78% nitrogen and 21% oxygen.
Generally, the equation for the ideal gas is mathematically given as
PV=nRT
Therefore
n=PV/RT
n=1*1000L/0,0821*298k
n=40.87mol
In conclusion
Where mole of O is 8.58
Therefore
Mass of O2=8.58*32
Mass of O2=2.74.7g
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Answer: 275 grams
Explanation:
One of the most important things you can do for yourself before you apply for a job is take a(n) ________ of your skills and experiences.
A.
mental picture
B.
photograph
C.
inventory
D.
memory
Answer:
C. inventory.
The answer is inventory.
Explanation:
Have a great day!! Brainliest will really help me since I have SO MANY POINTS and barely any crowns. Tysm, if you help! Hope this helps you!
The screenshots are below for question 44 of the Exam.
How many grams in total of potassium dichromate are there in a 250 mL bottle filled with 5 ppm solution of it?
The mass of is K2CrO7 in the 250 ml of solution is mathematically given as
x=1.25mg of K2CrO7.
Hence, 250 ml of the solution will contain 1.25mg of K2CrO7
The mass of is K2CrO7Question Parameters:
The total of potassium dichromate are there in a 250 mL bottle filled with 5 ppm solution
Generally the mass of k2CrO7 is mathematically given as
[tex]x=\frac{5mg of k2CrO7 *250ml of solution}{1000ml of solution}[/tex]
x=1.25mg of K2CrO7
Therefore,
250 ml of the solution will contain 1.25mg of K2CrO7
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ii. Using the equation Erd-Ecathode - Eanode, calculate the overall cell potential for the cell in step b.
Be sure to show all steps completed to arrive at the answer
Answer:
0.637 V
Explanation:
The balanced redox reaction is:
Here Zn undergoes oxidation by loss of electrons, thus act as anode. Lead undergoes reduction by gain of electrons and thus act as cathode.
Where both are standard reduction potentials.
= -0.763
= -0.126
The standard emf of a cell is 0.637 V
2. A gas that occupies a volume of 6.75 L at 89.0 atm will occupy what volume at 68.55 mm Hg if the temperature remains constant?
First convert pressure to atm
1atm=760mm hg68.55 mm Hg= 0.09atmNow
V1=6.75LV2=?P1=89atmP2=0.09atmApply Boyle's law
[tex]\\ \rm\Rrightarrow P1V1=P2V2[/tex]
[tex]\\ \rm\Rrightarrow 89(6.75)=0.09V2[/tex]
[tex]\\ \rm\Rrightarrow 600.75=0.09V2[/tex]
[tex]\\ \rm\Rrightarrow V2=\dfrac{600.75}{0.09}[/tex]
[tex]\\ \rm\Rrightarrow V2=6675L[/tex]
What words go where?
Answer:
1) temperature,
2) plant, physical, cracks, grow
3) freeze-thaw, physical
4) rain, chemical, acid rain, fossil
Explanation:
I'm not too sure if all of these are correct, but I hope this helps
1. Ingredients of iodized salt are not limited to salt (sodium chloride) and potassium iodide. Describe the roles (or functions)
of other ingredients of iodized salt. Morton salt has the famous slogan "When It Rains It Pours". Explain how other ingredients
are related to this slogan
Iodized salt contains potassium iodate, potassium iodide, sodium iodate, and sodium iodide.
What is iodized salt?
Salt is a very important ingredient used in cooking across the world. Salt is commonly obtained from sea water. Salt can also be manufactured artificially. Large deposits of salts occur in some parts of the world.
The ingredients that are contained in iodized salt include; potassium iodate, potassium iodide, sodium iodate, and sodium iodide. The species that contain iodine supply the iodine required by the thyroid gland.
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a person uses a force of 27 n to hold a stationary trash can a distance of .5 above the ground. how much work is done on the garbage can?
Answer:
135
Explanation:
Work can be calculated with the equation: Work = Force × Distance
Hope it helps!!!Brainliest pls!!!Kjeldahl's method can be used in the estimation of __________
Answer:
Nitrogen
Explanation:
The Kjeldahl method (the test for routinely determining the crude protein content of foods) determines a food's total nitrogen content, which is then used to estimate the crude protein content using a conversion factor.
I hope this helps you
:)
Answer: im pretty sure its Nitrogen!
hopes this helps ya out! have a day full of killing demons and slaying the dark lord..lol
a sealed plastic bottle falls into the ocean off australia three years later the bottle is found on a beach in france
Answer:
Wind, ocean currents, waves
Explanation:
The plastic bottle travelled this much distance due to the following factors:
a) Wind
b) Ocean currents
c) Waves