Answer:
.59925 moles
Explanation:
Is the answer B? Help
Answer:
A
Explanation:
Hmm, so we have the following in the diagram
Pt(s)
Cl2(g)
Ag(s)
NaCl(aq)
AgNO3(aq)
Pt 2+, 4+, 6+ Though it states Pt is inert
Cl 2-
Ag 1+
Na 1+
NO3-
Anode definition: the positively charged electrode by which the electrons leave an electrical device.
Electrode definition: a conductor through which electricity enters or leaves an object, substance, or region.
Cations attracted to cathode pick up electrons
Anions attracted to anode release electrodes+
Reduction at Cathode (red cat gain of e)
Oxidation at Anode (ox anode loss of e)
So from the diagram we can see that the charge is being generated through the 2 metal plates.
So the answer is A, the anode material is Pt and the half reaction is 2Cl- = Cl2 + 2e-
Which two factors contributed to the extinction of many large mammals over the last several million years, including woolly mammoths, saber-toothed cats, and giant ground sloths?
A. loss of habitat and contact with humans
B. loss of habitat and low variation in population
C. low population size and a warming environment
D. a warming environment and contact with humans
Answer:
Explanation:
loss of habitat and contact with humans
Answer:
A
Explanation:
Loss of habitat and contact with humans contributed to the extinction of many large mammals.
Molybdenum metal requires a photon with a minimum frequency of 1.09x1015s-1before it can emit an electron via the photoelectric effect.
a) What is the minimum energy needed to eject an electron?
b)What wavelength of radiation (in nm) will provide a photon of this energy?
c)How many electrons can be freed by a burst of radiation whose total energy is 1.00 μJ, assuming one photon causes one electron to be freed? (μ= micro = 10-6)
d) If molybdenum is irradiated with light of 122nm, what is the maximum kinetic energy of the emitted electrons?
Answer:
a) 7.22 × 10⁻¹⁹ J; b) 275 nm; c) 1.38× 10¹² electrons; d) 9.1 × 10⁻¹⁹ J
Explanation:
a) Minimum energy to eject photon
E = hf = 6.626× 10⁻³⁴ J·s × 1.09 × 10¹⁵ s⁻¹ = 7.22 × 10⁻¹⁹ J
b) Wavelength required
fλ = c
[tex]\lambda = \dfrac{c}{f } = \dfrac{2.998 \times 10^{8}\text{ m/s}}{1.09 \times 10^{15}\text{/s}} = 2.75 \times 10^{-7} \text{ m} = \textbf{275 nm}[/tex]
c) Electrons required
[tex]\text{No. of electrons} = 1.00 \times 10^{-6}\text{ J} \times \dfrac{\text{1 electron}}{7.22 \times 10^{-19}\text{ J}} = 1.38 \times 10^{12}\text{ electrons}[/tex]
d) Kinetic energy of electrons
a) Energy of photon
[tex]E = hf = \dfrac{\text{hc}}{\lambda} = \dfrac{6.626 \times 10^{-34} \text{ J$\cdot$ s}\times 2.998 \times 10^{8} \text{ m/s}}{122 \times 10^{-9}\text{ m}}= 1.63 \times 10^{-18} \text{ J}[/tex]
b) Maximum kinetic energy
The equation for the photoelectric effect is
hf = φ + KE, where
φ = the work function of the metal — the minimum energy needed to eject an electron
KE = hf - φ = 1.63× 10⁻¹⁸ J - 7.22× 10⁻¹⁹ J = 9.1 × 10⁻¹⁹ J
a. The energy of molybdenum to eject electron has been [tex]\rm \bold{7.22\;\times\;10^{-19}}\;J[/tex].
b. The wavelength of the radiation has been 275 nm.
c. The number of electrons present in [tex]\rm 1\;\mu J[/tex] energy has been [tex]\rm \bold{1.38\;\times\;10^1^2}[/tex].
d. The kinetic energy of the emitted electrons as been [tex]\rm \bold{9.1\;\times\;10^-^1^9\;J}[/tex].
The metal emits the energy when it returns from the excited state to ground state.
a. The energy (E) to eject electron has been given by:
[tex]E=h\nu[/tex]
Where, the value of constant, [tex]h=6.626\;\times\;10^{-34}\;\rm J.s[/tex]
The value of frequency has been given, [tex]\nu=\rm 1.09\;\times\;10^{15}\;s^{-1}[/tex]
Substituting the values for energy:
[tex]E=6.626\;\times\;10^{-34}\;\times\;1.09\;\times\;10^{15} \rm J\\\textit E=7.22\;\times\;10^{-19}\;J[/tex]
The energy of molybdenum to eject electron has been [tex]\rm \bold{7.22\;\times\;10^{-19}}\;J[/tex].
b. The wavelength ([tex]\lambda[/tex]) of the radiation has been given by:
[tex]\lambda=\dfrac{c}{\nu}[/tex]
Where, the speed of light, [tex]c=3\;\times\;\rm m/s[/tex]
The frequency has been given as, [tex]\nu=1.09\;\times\;10^{15}\;\rm s^-^1[/tex].
Substituting the values for wavelength:
[tex]\lambda=\dfrac{3\;\times\;10^8}{1.09\;\times\;10^{15}}\;\rm m\\ \lambda=2.75\;\times\;10^-^7\;m\\\lambda=275\;nm[/tex]
The wavelength of the radiation has been 275 nm.
c. The electrons ([tex]e^-[/tex]) burst out can be given as:
[tex]e^-=\dfrac{E}{E'}[/tex]
Where, the energy of radiations, [tex]E=1\;\times\;10^{-6}\;\rm J[/tex]
The energy of each electron has been calculated as, [tex]E'=7.22\;\times\;10^{-19}\;\rm J[/tex]
Substituting the values for number of electrons:
[tex]e^-=\dfrac{1\;\times\;10^-^6}{7.22\;\times\;10^-^1^9} \\e^-=1.38\;\times\;10^1^2[/tex]
The number of electrons present in [tex]\rm 1\;\mu J[/tex] energy has been [tex]\rm \bold{1.38\;\times\;10^1^2}[/tex].
d. The maximum kinetic energy (K.E.) of the radiation has been given as:
[tex]K.E.=\dfrac{hc}{\lambda} -E^'[/tex]
Where, the value of constant, [tex]h=6.626\;\times\;10^{-34}\;\rm J.s[/tex]
The speed of light, [tex]c=3\;\times\;\rm m/s[/tex]
The wavelength of the radiation, [tex]\lambda=122\;\times\;10^-^9\;\rm m[/tex]
Energy of each electron, [tex]E'=7.22\;\times\;10^{-19}\;\rm J[/tex]
Substituting the values, for kinetic energy:
[tex]K.E.=\dfrac{6.626\;\times\;10^{-34}\;\times\;3.0\;\times\;10^8}{122\;\times\;10^-^9}\;-\;7.22\;\times\;10^-^1^9\;\rm J \\\textit {K.E.}=9.1\;\times\;10^{-19}\;J[/tex]
The kinetic energy of the emitted electrons as been [tex]\rm \bold{9.1\;\times\;10^-^1^9\;J}[/tex].
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Which type of reaction is described by the following equation Na2O (s) + 2CO2 (g) + H2) (g) Produces 2 NaHCO3 (s)
Answer:
If the reaction is going from left to right it would be synthesis, if going right to left it would be decomposition.
Explanation:
Na2O (s) + 2CO2 (g) + H2O (g) = 2 NaHCO3 (s)
Left Side
Na = 2
O = 6
C = 2
H = 2
Right Side
Na = 2
O = 6
C = 2
H = 2
Ok so is balanced already, though initial equation in question had an error in regards to the left hand side the ) should have been an O.
Hmm
Na2O (s) + 2CO2 (g) + H2O (g) = 2 NaHCO3 (s)
If it was going from right to left would be decomposition
But going from left to right it would be synthesis
Oxygen is an example of a(n)
A. heterogeneous mixture
B. compound
C. element
O
OD. homogenous mixture
Reset Selection
Answer:
C. element. oxygen is an element
Explanation:
oxygen is element #8
The bridge over the river has a weight limit of 12.65 tons to cross it. The truck weighs 10.89 tons. How many tons is the truck under the weight limit
Answer:
It is 1.76 tons under the weight limit.
Explanation:
12.65
-10.89
= 1.76
how many moles of hydrogen will react with 40g oxygen
Answer: 2.5 moles
2H2 + O2 = 2H2O
This implies that 2 moles of oxygen is needed to react with one mole of oxygen to form 2 moles of water
It also implies that
2 moles of hydrogen requires 32 grams of oxygen
? moles of hydrogen would require 40 g of oxygen
2 x 40/32 = 2.5 moles
A saturated solution of sulfur dioxide is prepared by dissolving SO2(g) in 100. g of water at 10.°C and standard pressure.
Determine the mass of SO2 in this solution.
A.) 15g to 18g
B.) 40g to 43g
C.) 53g to 56g
D.) 6g to 8g
Answer:
The correct option is;
A.) 15 g to 18 g
Explanation:
The solubility of sulfur dioxide at room temperature = 94 g/L of water forming sulfurous acid as follows;
SO₂ + H₂O ⇄ HSO₃⁻ + H⁺
Which is a partial reversibly association with water molecules
Whereby 1 liter of water weighs 1 kg
9.4 gram of SO₂ will dissolve in 100 g of water at room temperature of 23 to 24°C
The solubility increases as the temperature reduces therefore as shown from the sulfur dioxide solubility chart we have;
At 10°C the solubility of SO₂ (g) is midway between 150 g to 200 g per kg of water
Therefore;
The solubility of SO₂ (g) is between 15 g to 18 g per 100 of water.
The mass of SO2 in the given solution should be an option a 15g to 18g.
Calculation of the mass:Since the solubility of sulfur dioxide at room temperature = 94 g/L of water forming sulfurous acid likewise:
SO₂ + H₂O ⇄ HSO₃⁻ + H⁺
This represents the partial reversibly association along with water molecules
Here 1 liter of water weighs 1 kg
So we can say that
9.4 gram of SO₂ will dissolve in 100 g of water at room temperature of 23 to 24°C
Due to this, there is an increase in solubility this result in decrease in the temperature
Also, At 10°C the solubility of SO₂ (g) is midway between 150 g to 200 g per kg of water
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What determines the average kinetic energy of the particles in a gas?
A.
the number of collisions
B.
the number of particles
OC.
the size of the particles
D.
the temperature
Answer:
D
The temperature.
Explanation:
Crude oil is a miscible mixture of liquids that has many uses . During the refining process it is separes and used to produce aviation fuel diesel fuel and gasoline how should scientists separate crude oil based on its physical properties
Answer:
3 rd point will be the ans
could some please help me with this? thank you
Answer:
C
Explanation:
Oxidation occurs at the anode. That means the element's oxidation number should increase. Mg has an oxidation number of 0, but Mg2+ has an oxidation number of 2, showing it was oxidized.
The Law of Conservation of Matter
states that matter cannot be created
or
a. enlarged
B. changed
C. broken
D. destroyed
Answer:
The law of conservation of matter indicates that matter cannot be created nor destroyed.
So D Destroyed
why the renewable energy resource you chose is positive
Answer:
Renewable energy require less overall maintenance than generators that use traditional fuel sources. Renewable energy has numerous health and environmental benefits.
Explanation:
Match the description to the correct term. If the description matches both terms, use
"both" for your answer.
Cause(s) the temperature of
the surroundings to
decrease.
Cause(s) a change in the
temperature of the
surroundings.
Cracking open a cold-pack.
Burning Wood
Absorb(s) energy from the
surroundings.
Cause(s) the temperature of
the surroundings to increase.
Release(s) energy to the
surroundings.
1. Endothermic reaction
2. Exothermic reaction
3. Both
Answer:
Cause(s) the temperature of the surroundings to decrease. - 1. Endothermic reaction.
Cause(s) a change in the temperature of the surroundings. - 3. Both.
Cracking open a cold-pack. - 1. Endothermic reaction.
Burning Wood. - 2. Exothermic reaction.
Absorb(s) energy from the surroundings. - 1. Endothermic reaction.
Cause(s) the temperature of the surroundings to increase. - 2. Exothermic reaction.
Release(s) energy to the surroundings. - 2. Exothermic reaction.
Define Acid dissociation constant constant
Answer:
An acid dissociation constant, K a, (also known as acidity constant, or acid-ionization constant) is a quantitative measure of the strength of an acid in solution. It is the equilibrium constant for a chemical reaction ↽ − − ⇀ − + + known as dissociation in the context of acid–base reactions.
Explanation:
Neutrons are in the nucleus of the atom. A neutron has
a) A positive charge
b) No charge
c) A negative charge
d) Twice as much positive charge as a proton
Answer: B. (No charge)
Explanation:
Protons have a positive charge, electrons have a negative charge.
Neutrons are neutral and therefore have no change.
How many grams are in 0.572 moles of glucose, C6H12O6
Answer:
103.00
Explanation:
1 mole of Glucose
6 C = 6 * 12 = 72 grams
12H = 12 * 1 = 12 grams
6O = 6 * 16 =96 grams
Total = 180 grams
0.572 moles of Glucose
1 mol of glucose = 180 grams
0.572 mols of glucose = x
x = 0.572 * 180
x = 103.00 grams
Compounds formed from only non-metals consist of particles called
Answer:
Compounds formed from non-metals consist of molecules.
Explanation:
The atoms in a molecule are joined together by covalent bonds. These bonds form when atoms share pairs of electrons.
I hope I helped, please correct me if I'm wrong!
Considering the definition of covalent bond and molecules, compounds formed from only non-metals consist of particles called molecules.
But you have to know that the covalent bond is the chemical bond between atoms where electrons are shared, forming a molecule.
Covalent bonds are established between non-metallic elements, such as hydrogen H, oxygen O and chlorine Cl. These elements have many electrons in their outermost level (valence electrons) and have a tendency to gain electrons to acquire the stability of the electronic structure of noble gas.
The shared electron pair is common to the two atoms and holds them together.
In other words, a covalent bond is a type of chemical bond where two atoms of non-metallic elements join to form a molecule, where the atoms share pairs of electrons from their most superficial layer or valence layer to achieve stability in the molecule and thus complying with the octet rule.
In summary, compounds formed from only non-metals consist of particles called molecules.
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https://brainly.com/question/12661797?referrer=searchResultshttps://brainly.com/question/4461443?referrer=searchResultshttps://brainly.com/question/11693996?referrer=searchResultsHow many kilograms of gasoline fill a 12.0-gal gas tank
Answer:
29.98kg
Explanation:
12.0 gallons * (3.78541178 liters/gallon) * (1000 mL/liter) * (0.66 g/mL) * (1 kg/1000 g) = 29.98 kg
29.98kg of gasoline fill a 12.0-gal gas tank
what is gasoline ?gasoline or gas or petrol a mixture of volatile, flammable liquid hydrocarbons which is derived from petroleum and used in many application like fuel in internal-combustion engines, solvent for oils and fats.
It is a by-product of the petroleum industry, used in automobile fuel due to its high energy of combustion and easily mix with air in a carburetor.
Gasoline is produced by distillation by separating the volatile substance, later on other designed process yield of gasoline from crude oil by splitting large molecules into smaller ones by cracking method.
12.0 gallons * (3.78541178 liters/gallon) * (1000 mL/liter) * (0.66 g/mL) * (1 kg/1000 g) = 29.98 kg of gasoline fill the tank.
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Which molecule is an alkyne?
A. 2-ethylhexane
B. 2-nonyne
C. trans-2-pentene
D. Pentane
Answer:Ethyne
Explanation:
Ethyne is more commonly known under the trivial name acetylene. It is the simplest of the alkynes, consisting of two carbon atoms connected by a triple bond, leaving each carbon able to bond to one hydrogen atom. Since both carbon atoms are linear in shape, all four atoms lie in a straight line.
2-nonyne molecule is an alkyne. Hence, option B is correct.
What is alkyne?Alkynes are groups of hydrocarbons that have the general formula of {Cn H2n - 2}. They have a triple carbon-to-carbon bond (C≡C) in their structure. Ethyne (HC≡CH) is the first member of the alkyne series.
Ethyne is more commonly known under the trivial name acetylene. It is the simplest of the alkynes, consisting of two carbon atoms connected by a triple bond, leaving each carbon able to bond to one hydrogen atom.
Since both carbon atoms are linear in shape, all four atoms lie in a straight line.
Hence, option B is correct.
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Calculate the theoretical yield for the amount of sodium carbonate produced as a result of this chemical reaction. Record your final answer in the above data table.
Calculate the percent yield using your theoretical yield and the amount of sodium carbonate that was actually recovered. Record your final answer in the above data table.
How did your calculated mass of sodium carbonate compare with the actual mass you obtained from the experiment? If the two masses are different, suggest reasons for the difference.
Predict the amount of water and carbon dioxide that was produced as a result of this reaction.
1.
Mass of crucible
5.26 g
2.
Mass of crucible & NaHCO3
8.27 g
3.
Mass of NaHCO3 (2-1)
3.01g
4.
Theoretical Yield of Na2CO3
(Use the amount calculated in #3 as your starting amount)
g
5.
Mass of crucible & Na2CO3
7.13 g
6.
Mass of Na2CO3 – Actual Yield (5-1)
1.87 g
7.
% Yield = actual yield x 100
theoretical yield
%
Answer:
98.6%
Explanation:
First we put down the equation representing the decomposition of sodium bicarbonate.
2NaHCO3(s) ----> Na2CO3(s) + H2O(l) + CO2(g)
We can see from the data provided that the mass of sodium bicarbonate reacted is 3.01 g.
The number of moles of sodium bicarbonate reacted= mass of sodium bicarbonate/ molar mass of sodium bicarbonate
Molar mass of sodium bicarbonate= 84.007 g/mol
Number of moles of sodium bicarbonate=3.01 g/ 84.007 g/mol
Number of moles of sodium bicarbonate= 0.0358 moles
From the balanced reaction equation,
2 moles of sodium bicarbonate yields 1 mole of sodium carbonate
Hence 0.0358 moles of sodium bicarbonate yields 0.0358/2 = 0.0179 moles of sodium carbonate
Theoretical yield of sodium carbonate = number of moles of sodium carbonate × molar mass of sodium carbonate
Molar mass of sodium carbonate= 105.9888 g/mol
Theoretical yield of sodium carbonate= 0.0179 moles × 105.9888 g/mol
Theoretical yield of sodium carbonate= 1.897 g
Actual yield of sodium carbonate= 1.87 g
%yield of sodium carbonate= 1.87/1.897 ×100
%yield of sodium carbonate= 98.6%
Please I need this answer quick I will give brainliest
A student decreases the temperature of a 417 cm³ balloon from 278 K to 231 K.
Assuming constant pressure, what should the new volume of the balloon be?
376 cm³
417 cm³
462 cm³
924 cm³
Answer:
The new volume of the balloon is [tex]346.5\ cm^3[/tex].
Explanation:
Initial volume of a balloon is 417 cm³
The temperature decreases from 278 K to 231 K.
It is required to find the new volume of the balloon if the pressure is constant pressure. At constant pressure, volume is directly proportional to the temperature. So,
[tex]V\propto T[/tex]
i.e.
[tex]\dfrac{V_1}{V_2}=\dfrac{T_1}{T_2}[/tex]
V₂ is final volume.
[tex]V_2=\dfrac{V_1T_2}{T_1}\\\\V_2=\dfrac{417\times 231}{278}\\\\V_2=346.5\ cm^3[/tex]
So, the new volume of the balloon is [tex]346.5\ cm^3[/tex].
What might happen to global atmospheric carbon levels if the polar ice caps were to melt?
If the polar ice caps were to melt then it could lift the lid of a new carbon sink capable of soaking up carbon dioxide.
What happens if the polar ice caps melt?
If all the ice protecting Antarctica, Greenland, and mountain glaciers around the sector were to melt, sea degrees might upward push about 70 meters (230 ft). the sea might cowl all of the coastal towns. And the land place would decrease considerably. but many cities, inclusive of Denver, might live to tell the tale.
How do melting ice caps affect the ecosystem?
Melting ice reasons more warming.
because they are darker in the shade, the ocean and land take in more incoming solar radiation and then launch the warmth to the environment. This reasons more global warming. in this way, melting ice causes more warming and so extra ice melts.
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What is the Log(10^-4)
Answer:
-4
Explanation:
[tex]log 10^{-4} = -4 log 10[/tex]
log 10 = 1
Therefore -4 log 10 = -4 x 1 = -4
What types of substances are considered drugs?
Answer:
Marijuana
Opiates
Opioids
Explanation:
Liquid acetone is ______________.
A incompressible and has a definite shape.
B compressible and has definite volume.
C incompressible and has an indefinite shape.
D compressible and has an indefinite volume.
Can some one please help?
Neutralization Reactions
PREDICT THE PRODUCTS OF THE FOLLOWING REACTIONS
HNO3+ Ba(OH)2
+
+
H3PO4 + Ca(OH)2
HCI + FelOH)3 –
Answer:
2HNO3 + Ba(OH)2 = Ba(NO3)2 + 2H2O
H3PO4 + Ca(OH)2 = Ca3(PO4)2 + 6H2O
3HCl + Fe(OH)3) = FeCl3 + 3H2O
Explanation:
H+
N3-
O2-
Ba2+
OH-
P 5+, 3+, 3-
Ca2+
Cl-
Fe 2+, 3+
2HNO3 + Ba(OH)2 = Ba(NO3)2 + 2H2O
H3PO4 + Ca(OH)2 = Ca3(PO4)2 + 6H2O
3HCl + Fe(OH)3) = FeCl3 + 3H2O
How many moles of neon (Ne) gas have a volume of 2.2 L and a pressure of
0.83 atm at 283 K?
(The universal gas constant is 0.0821 L.atm/mol.K.)
O A. 13 mol
O B. 0.11 mol
O C. 42 mol
O D. 0.079 mol
Answer:
D. 0.079 mol
Explanation:
This question involving the number of moles of neon (Ne) gas can be solved using the ideal gas law, also called the general gas equation.
The formula for the general gas equation is:
PV = nRT
Where;
P = pressure (atm)
V = volume (Litres)
n = amount of substance (mol)
R = ideal gas constant
T = temperature (K)
In this question, P is given as 0.83atm, V = 2.2L, R = 0.0821 L.atm/mol.K, T= 283K, n = ?
We calculate 'n' by making it the subject of the formula i.e.
PV= nRT
Divide both sides by RT, we have;
n = PV/RT
Hence, we input our values
n = 0.83 × 2.2 / 0.0821 × 283
n= 1.826 / 23.2343
n = 0.07859
Hence, n is approximately 0.079 mol
For neon, determine the moles and mass contained in a 29.9−L volume at a pressure of 481.1 torr at a temperature of 300.0 K.
Answer:
.7689 mol
15.516 g
Explanation:
Use the Ideal Gas Law, PV = nRT.
Make sure to use the correct ideal gas constant R. You can either put R in torr, or you can change the pressure to atm. I've just used the torr ideal gas constant.
481.1 torr * 29.9 L = n 62.364 LTorr/molK * 300 K
14384.89 = 18709.2n
n = .7689 mol
The molar mass of neon (remember that neon gas = Ne, it's not diatomic) is 20.18 g/mol from the periodic table.
.7689 mol * 20.18 g/mol = 15.516 g
Arrange the following rock particles which occur in soil in the decreasing order of their sizes:
Sand, Clay, Gravel, Silt.Immersive Reader
(1 Point)
Clay>Silt>Sand>Gravel
Silt>Clay>Sand>Gravel
Gravel >Sand>Silt>Clay
Answer:
Gravel >Sand>Silt>Clay
Explanation:
Sand, Clay, Gravel and Silt
Clay: all particles smaller than 0.002 mm
Silt: all particles within the size range of 0.002-0.05 mm;
Sand: all particles within the size range of (2.0 mm - 0.05 mm)
Gravel particles are larger than sand, ranging in size from 4.75 mm to 75 mm
Going through the options, the correct option is;
Gravel >Sand>Silt>Clay