Answer:
38.54 x 10^23 atoms of N2
Explanation:
Each mole contains Avagadro's Number ( 6.022 x10^23) of particles
3.2 x 6.022 x 10^23 = 19.27 x 10^23 MOLECULES
N2 is TWO atoms soooo 2 x 19.27 x 10^23 = 38.54 x 10^23 atoms
please help
Which statement is true about a nickel-cadmium dry cell?
The anode reaction is NiO2+H2O+2e−→Ni(OH)2+2OH−.
The cathode reaction is Cd+2OH−→Cd(OH)2+2e−.
The cathode reaction is NiO2+H2O+2e−→Ni(OH)2+2OH−.
The cathode reaction is Cd+NiO2+2H2O→Cd(OH)2+Ni(OH)2.
Answer:
I think I answered this already but I'll put it again:
The cathode reaction is NiO2+H2O+2e−→Ni(OH)2+2OH−.
ILL GIVE BRAINLY!!!!!!
How many different elements are involved in the reaction shown below?
CH4 + 2 O2 → CO2 + 2 H2O
Answer:
four
Explanation:
There is four
CH 4 methane
O2 oxygen
CO2 carbon dioxide
H20 water
The total mass of the reactants is equal to the total mass of products. this is known as the conservation of what?
Explanation:
the law of conservation of mass
Answer:
Explanation:
the law of conservation of mass
What happens when light enters water?
A. It’s speed stays the same
B. It speeds up
C. It can’t get back out
D. It slows down
Answer:
It slow down
It slow down when it passes from the less dense air into the denser glass or water
A 10.00 g sample of wood from an archaeological site produced 3072 counts in a 10-hour measurement owing to the presence of carbon-14, while a 10.00 g sample of new wood produced 9216 counts in the same period of time. The half-life of carbon-14 is 5730 years. How old is the wood from the archaeological site
From the calculation, the age of the sample of carbon - 14 is 9156 years.
What is radioactivity?The term radioactivity refers to the fact that a substance could disintegrate spontaneously when left alone.
Now, given that;
0.693/t1/2 = 2.303/t log (No/N)
t1/2 = half life
t = age of the sample
No = amount of sample originally present
N = amount of sample present at time t
Hence;
0.693/5730 = 2.303/t log (9216/3072)
1.2 * 10^-4 = 2.303/t * 0.4771
1.2 * 10^-4 = 1.09876/t
t = 1.09876/1.2 * 10^-4
t = 9156 years
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phase changes lab, please! I need help fast deadline is really close.
Phase change occur in substances when the they change from one state of matter to another due to the addition or removal of heat.
What are phase changes?Phase changes refers to the changes that occur in substances in which they change from one state of matter to another due to the addition or removal of heat.
The phase changes that occur in substances are as follows:
change from solid to liquid known as meltingchange from liquid to gas known as vaporization change from solid to gas known as sublimation change from gas to solid known as deposition change from gas to liquid known as condensation change from liquid to solid known as freezingTherefore, phase change occur in substances when the they change from one state of matter to another due to the addition or removal of heat.
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What will be the efficiency of a machine which has an energy loss of 10%
The efficiency of the machine which has an energy loss of 10% is 90%
What is efficiency?This can be defined as the capacity to achieve a given task with little or no waste. Mathematically, it can be expressed as
Efficiency = (output / input) × 100
How to determine the efficiencyWe shall assume the following:
Input = 100 JOutput = 100 – 10 = 90 JEfficiency =?Efficiency = (output / input) × 100
Efficiency = (90 / 100) × 100
Efficiency = 90%
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Describe the method you could use to investigate the volume of hydrogen produced during the electrolysis of sodium chloride.
Answer:
Gas tests include:
hydrogen - lighted splint goes out with a squeaky pop.
Explanation:
Examine the map and then answer the question.
North Sea
B
Allante
Ocean
A
Mediterranean
Otto von Bismarck united small independent states in which region?whats the answer
In 1867, Otto von Bismarck created the Northern Confederation, a combination of the northernmost German states beneath Prussian rule.
Who Was Otto Von Bismarck?The "Iron Chancellor," Otto von Bismarck (1815–1898), oversaw the unification and modernization of Germany. He virtually ruled Prussia and then all of Germany between 1862 until 1890. To unify the 39 autonomous German states under Prussian control, great strategist Bismarck launched decisive wars with France, Austria, & Denmark.
In 1864, Bismarck began the series of wars that'd make Prussia the most powerful country in Europe. He invaded Denmark to seize control of the German-speaking province of Schleswig-Holstein, and two years later he persuaded Emperor Franz-Josef I to start the Austria- War (1866), which brought about an immediate defeat for the faltering Austrian empire.
Thus, on 1867, Otto von Bismarck created the Northern Confederation, a combination of the northernmost German states beneath Prussian rule.
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At what temperature would 0.46 moles of a gas occupy 13.3 L if the pressure is 734 mm Hg?
Answer: 339.84 K
Explanation:
[tex]$$We are given: \\$\mathrm{n}=0.46$ moles \\$V=13.3 \mathrm{~L}$\\$\mathrm{P}=734 \mathrm{~mm} \mathrm{Hg}=0.965 \mathrm{~atm}$\\Putting these values in ideal gas equation we get:\\$0.965$ batm * $13.3 \mathrm{~L}=0.46 \mathrm{~mol} * 0.0821 \frac{\mathrm{atmL}}{\mathrm{molK}} * \mathrm{~T}$\\$\mathrm{T}=\frac{0.965 * 13.3}{0.46 * 0.0821} \mathrm{~K}$$$\mathrm{T}=339.84 \mathrm{~K}$$[/tex]
Which statement best describes an advantage of describing a system with a mathematical model?
A.
It enables people to calculate how a change in one variable will affect other variables.
B.
It helps people visualize the way that systems are interconnected.
C.
It simplifies the system by describing only one variable at a time.
D.
It allows people to manipulate something that looks like the actual system.
An advantage of describing a system with a mathematical model is that it enables people to calculate how a change in one variable will affect other variables.
Describes an advantage of a system with a mathematical model?A mathematical model usually describes a system by a set of variables and equations that formed relationships between the variables. Variables examples such as real or integer numbers.
So we can conclude that An advantage of describing a system with a mathematical model is that it enables people to calculate how a change in one variable will affect other variables.
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Assume that your electrical power company gets its energy from a hydroelectric dam. Outline all of the energy changes that occurred from the falling water that turned the generators at the dam to the hot air that was produced from your hair dryer this morning.
Answer:
See explanation.
Explanation:
This isn't chemistry. Its physics. Kinetic energy (water) to electric energy (dam) as the hydroelectric dam works. Then, as the current travels from the plant to your crib, electric energy to heat energy (wire resistance). Then when you are using the dryer electric energy to heat energy (hot air) and sound energy (air particles vibrate due to the heat energy).
how do you treat a sulfuric acid burn with sodium hydroxide
Among K, Ca and Ba, which element possess low ionization energy?
Among the elements Barium has the lowest Ionization Energy.
What is Ionization Process ?The process by which any neutral atom gets converted into electrically charged by gaining or losing electron is called Ionization Process.
K is an alkali metal it has to lose one electron to attain stable electronic configuration of an inert gas
For removing second electron , a stable configuration has to be broken and so will require high amount of energy.
Ca and Ba are alkaline earth metals.
They both have to lose 2 electrons to attain stable electronic configuration of noble gas.
They have low Iow Ionization Energy as compared to K.
Ca has higher Ionization Energy as compared to Ba because when we move down the periodic table , The ionization energy decreases.
Hence , Among the elements Barium has the lowest Ionization Energy.
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What is an example of service in the cement industry
Answer:
What kind of industry is cement industry?
The cement industry is one of the main industries necessary for sustainable development. It can be considered the backbone for development. The main pollution source generated from cement industry is the solid waste called cement by-pass dust, which is collected from the bottom of the dust filter.
Explanation:
Does anyone know what 5.7365 x 10^-5 + 3.4891 x 10^-8 is? in scientific notation preferably?
Answer:
5.7400 × 10⁻⁵
Explanation:
The rate law for the reaction 3a ⟶⟶ c is rate = 4. 36 x 10–2 l • mol–1 • h–1[ a ]2 how long will it take in hours for the concentration of a to decrease from 0. 74 m to 0. 21 m?
The hours taken for concentration to decrease from 0 to 74 min. to 0.21 m is 91.7 hours.
What is the rate law of a reaction?Rate law depicts the rate of a chemical reaction depend on the concentration of the reactant.
The given reaction is second order reaction
Thus, the hours taken for concentration to decrease from 0 to 74 min. to 0.21 m is 91.7 hours.
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Gas Law- please help!!!
In a mixture of carbon dioxide and oxygen, 40.0% of the gas pressure is exerted by oxygen. If the total pressure is 115 mmHg, what is the pressure of the carbon dioxide in
atm?
The pressure of the carbon dioxide will be 0.09079 atm.
What is partial pressure?The pressure exerted by the individual gas is known as partial pressure.
The partial pressure is given as
[tex]\rm P_{Total} = P_1 + P_2 + ...[/tex]
In a mixture of carbon dioxide and oxygen, 40.0% of the gas pressure is exerted by oxygen.
If the total pressure is 115 mmHg.
The total pressure in atm will be
P = 115 mmHg
P = 0.15132 atm
We have
[tex]\rm P_T \ \ \ = P_{O_2} + P_{CO_2}\\\\0.15132 \ \ = 0.4 \times 0.15132 +P_{CO_2}\\\\ P_{CO_2} = 0.09079\ atm[/tex]
Then the pressure of the carbon dioxide will be 0.09079 atm.
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If you have 3 moles of gas at a pressure of 2.5 atmospheres and a volume of 8 liters, what is the temperature? Pay attention to the unit of pressure used.
A.) 81.27 K
B.) 0.81 K
C.) 57.86 K
D.) 25 K
The temperature of the gas would be 81.2 K
Ideal gas equationThe ideal gas equation is given by:
PV = nRT, where P, V, n, R, and T equals pressure, volume, number of moles, constant, and temperature respectively.
In this case, V = 8L, n = 3 moles, R = 8.317, and P = 2.5 atm or 253.3125 kpa
T = PV/nR = 253.3125 x 8/3 x 8.317 = 2026.5/24.951 = 81.2 K
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As you move upward, from level, in an energy pyramid, available energy ____.
1. is destroyed
2. decreases
3. stays the same
4. increases
The available energy decreases as one moves upward in an energy pyramid.
Energy pyramidThe energy pyramid represents a model of how energy is transferred from one trophic level to another in ecosystems.
Energy is transferred from producers to primary consumers, from primary to secondary consumers, from secondary to tertiary consumers, and so on.
Only about 10% of the available energy in one trophic level is transferred to the next with the remaining 90% being lost as heat to the environment.
Thus, as one moves up the energy pyramid, the available energy decreases. This is why organisms at the higher end of the energy pyramid have to devise an efficient way of extracting energy from their foods.
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The volume of a gas is 6.10 l, measured at 1.50 atm. what is the pressure of the gas in
mmhg if the volume is changed to 9.74 l?
Answer:
713.96mmhg
Explanation:
p1v1=p2v2
6.10×1.50/9.74
=0.939atm
=0.939*760
=713.96mmhg
Bromine has two naturally occurring isotopes (br-79 and br-81) and has an atomic mass of
79.904 amu. the mass of br-81 is 80.9163 amu, and its natural abundance is 49.310%. what is
the mass of br-79?
Answer: 78.919 amu
Explanation:
If the natural abundance of Br-81 is 49.310%, then the natural abundance of Br-79 must be 100%-49.310%=50.690%
Substituting into the atomic mass formula,
[tex]79.904=(0.49310)(80.9163)+(0.50690)(x)\\79.904=39.89982753+(0.50690)(x)\\40.00417247=(0.50690)(x)\\x=\frac{40.00417247}{0.50690}=\boxed{78.919 \text{ amu}}[/tex]
How many moles of ch4 are contained in 96. 0 grams of ch4.
Answer:
6 mol
Explanation:
Discussion
The answer is very nearly six. I will use rounded whole numbers to get the molar mass. Every periodic table is different so you will have to redo my numbers using your periodic table.
The trick is to find 1 mole of CH4 and divide that into 96.
Givens
96.0 grams of CH4
Solution
Find 1 mol of CH4
1 * 1C = 1 * 12 = 12 grams of Carbon in 1 mol of CH4
4 * H = 4 * 1 = 4 grams of Hydrogen in 1 mol of CH4
Total = 16 grams of C and H in 1 mol of CH4
Find 96 grams in mols.
Formula
mol = given mass / molar mass
given mass = 96 grams
molar mass = 16 grams
Mol = 96 / 16
Answer: mol = 6
Suppose that 5-ml containers of helium (He), neon (Ne), and argon (Ar) are at pressures of 1 atm,
2 atm, and 3 atm, respectively. The He and Ne are then added to the container of Ar.
a. What is the partial pressure of He in the container after the three gases are mixed?
b. What is the total pressure in the container after the three gases are mixed?
The total pressure in the container after the three gases are mixed is 6 atm and the partial pressure of He is 1 atm.
What is Dalton's Law of Partial Pressure ?According to Dalton's Law of Partial Pressure , the pressure exerted by a mixture of gas is equal to the sum of the partial pressure of the gases in the mixture.
P(total) = p₁ +p₂+p₃+.....
As the volume of the containers are same and the
n = 1*5/RT for Helium
n = 2*5 /RT for Neon
n= 3*5/RT for Argon
Mole fraction = moles of the element/Total moles
Moles fraction of Helium is
[tex]\rm \dfrac{1*5}{1*5+2*5+3*5}[/tex]
= 1/6
Total Pressure in the container = 1 + 2 +3 = 6 atm
The partial pressure of Helium will be
=Mole fraction * Total pressure
=(1/6)*6 atm
= 1 atm , as the volume is same the temperature is same , the pressure will also be same.
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What can scientists learn from radiometric dating?
A- how long ago a plant or animal lived
B- how much time it took a fossil to form
C- where a plant or animal lived
D- whether a fossil has modern relatives
Answer:
A- how long ago a plant or animal lived
1. If the pressure of a fixed volume of gas decreased in a sealed container, what variable would you think changed? did this variable increase or decrease?.
Answer:
Temp decreased
Explanation:
If the container is sealed and the pressure DEcreases, then the temperature DEcreased
PV = n RT n R V are constant if P goes down then so does T
The general form AB àA + B represents which type of reaction?
Answer:
hope this helps and if you have any questions please feel free to ask me any time
Draw the Lewis structure for ClO.
The Lewis Structure for ClO. is attached in the image.
What is Lewis Structure ?Lewis structure represents the structure of atoms or molecules with their valence electron.
It is a two-dimensional model that helps us to know, how many bond pairs and a lone pair a molecule contains.
Lewis structure of ClO⁻ is very simple to draw as it has only two atoms(chlorine and oxygen), we have to just represent the valence electron around them and complete their octet.
1. Count total valence electron in ClO-
Total number of the valence electrons in chlorine = 7
Total number of the valence electrons in oxygen = 6
Total number of valence electrons = 7 + 6 + 1 = 14 valence electrons
[∴one oxygen atom, one chlorine, and one negative charge that count as a one valence electron]
2. Find the least electronegative atom and placed it at center
Connect outer atoms to central atom with a single bond Cl-O bond
Now count the valence electron in the above structure.
Single bond means two-electron , only one single bond is used.
Hence, only 2 valence electrons are used in the above structure from 14 total valence electrons available for drawing the lewis structure of ClO-.
(14 – 2) = 12
We have left with 12 valence electrons more.
3. Place remaining valence electrons starting from outer atom first
So, put the valence electron around the chlorine and oxygen.
we put 6 electrons around chlorine and oxygen, as each of them already sharing 2 electrons with the help of a single bond between them.
The structure can be seen in the figure attached.
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What does Fe(NO3)2 + Cu stands for?
what is the specific heat capacity of propan-1-ol
Answer:
11–350°
Explanation: