Answer:
A.
Explanation:
To help prevent water pollution
Set of degenerate orbital in germanium
Answer:
Which set of orbitals are degenerate?
Degenerate is used in quantum mechanics to mean 'of equal energy. ' It usually refers to electron energy levels or sublevels. For example, orbitals in the 2p sublevel are degenerate - in other words the 2px, 2py, and 2pz orbitals are equal in energy, as shown in the diagram.
Explanation:
Answer:
Electron orbitals having the same energy levels are called degenerate orbitals, For example, orbitals in the 2p sublevel are degenerate - in other words the 2px, 2py, and 2pz orbitals are equal in energy.
How is the kinetic energy of the particles of a substance affected during a phase change?
O Kinetic energy increases during exothermic changes and decreases during endothermic changes.
O Kinetic energy decreases during exothermic changes and increases during endothermic changes.
O Kinetic energy does not change, but the potential energy does.
O Kinetic energy changes in the opposite way that the potential energy changes,
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Which property among the following is best suitable for metalloids
1 Brittle and behaves like a non-metal
2 Have the property of metals and non-metals
3 Malleable and ductile
4 Conducts electricity and behaves like a metal
Answer:
2. Have the property of metals and non-metals
Explanation:
A metalloid is a substance that posseses the characteristics of both metals and non-metals. In other words, it can be said to be an intermediary between metals and nonmetals.
According to this question, a metalloid
How many moles of gas are present at a pressure of 1.00 atm in a container that is 4.0 liters in a room that is 25°C?
A) 0.013 mol
B) 1.9 mol
C) 0.16 mol
D) 6.1 mol
One mole of gas is in a 2.0 L container at 1.0 atm pressure and 20°C. If the volume is doubled, and the temperature remains constant, what will happen to the pressure?
A) The pressure will quadruple.
B) The pressure will double.
C) The pressure will decrease by half. D) The pressure will decrease by one-quarter.
Answer:
A) 0.013 mol
Explanation:
B) The pressure will double.
Is it possible for a reaction with + ΔG° to still be spontaneous in the forward direction? Explain.
Answer:
See explanation.
Explanation:
Hello!
In this case, according to the thermodynamic definition of the Gibbs free energy:
[tex]\Delta G=\Delta H-T\Delta S[/tex]
In the scenario by which G>0 (nonspontaneous) it would be possible for reaction to have a G<0 (spontaneous) if:
- If H>0 and S>0, then the temperature should be increased until the process was entropy-driven for it to be possible.
- If H> and S<0, then it'd be impossible to have an spontaneous process.
- If H<0 and S>0 then the process was not spontaneous.
- If H<0 and S<0 it is possible if the temperature is not high enough to ensure the process is enthalpy-driven.
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TRUE OR FALSE! Please help
How many moles are in 23 grams of potassium
Answer:
.588mol K
Explanation:
K has a molar mass of 39.1 g/mol. This means that one mole of potassium has a mass of 39.1 grams. We can use stoichiometry/dimensional analysis to figure out how many moles is equal to 23 grams.
[tex]23.0g K(\frac{1 mole}{39.1} ) = .588mol K[/tex]
Swag? Swag? Swag? Swag? Swag?
giving 300 pts if u get it correct I will put up a separate link so u can get the
Which gases makes up most of Earth’s atmosphere?
Question 1 options:
argon and water vapor
carbon dioxide and oxygen
nitrogen and oxygen
oxygen and argon
Question 2 (1 point)
What is the correct order of earth's atmospheric layers from bottom to top?
Question 2 options:
Mesosphere, Stratosphere, Troposphere, Thermosphere, Exosphere.
Troposphere, Stratosphere, Mesosphere, Thermosphere, Exosphere
Stratosphere, Troposphere, Mesosphere, Thermosphere, Exosphere.
Thermosphere, Mesosphere, Stratosphere, Troposphere Exosphere.
Question 3 (1 point)
Which characteristics makes the mesosphere different from the other layers of the atmosphere?
Question 3 options:
It is the lowest layer
It is the largest layer
It is the coldest layer
It is the thinnest layer.
Question 4 (1 point)
Based on the diagram above which change can be observed when moving from the troposphere into the stratosphere?
Question 4 options:
Air pressure decreases
Air particles increase
Temperature increases
Question 5 (1 point)
Certain gases in Earth’s atmosphere slow down the movement of energy away from Earth’s surface by absorbing and re-emitting infrared radiation. This helps to keep the surface of Earth at an average temperature of 15°C (59°F). What is this process called?
Question 5 options:
The Coriolis Effect
The Solar Effect
The Greenhouse Effect
The Global Warming Effect
Question 6 (1 point)
How might the increase of volcanic eruptions affect Earth?
Question 6 options:
It might produce more ozone in the atmosphere
It might decrease temperature across Earth
It might increase the carbon dioxide in the atmosphere
It might cause the Earth’s surface to absorb more oxygen.
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Determine which heat transfers below are due to the process of conduction.
I) You walk barefoot on the hot street and it burns your toes.
II) When you get into a car with hot black leather seats in the middle of the summer and your skin starts to get burned when you touch the seats.
III) A flame heats the air inside a hot air balloon and the balloon rises.
IV) A boy sits to the side of a campfire. He is 10 feet away, but still feels warm.
Question 1 options:
I & II
III & IV
I, II, & IV
II, III, IV
Question 2 (1 point)
Saved
The heat transfer depicted in the image is MOST likely
Question 2 options:
circulation
conduction
convection
radiation
he method of heat transfer by which the sun energy reaches the earth is
Question 3 options:
conduction
convection
radiation
solaration
Question 4 (1 point)
Carol owns a two story house with a heating and cooling unit on each floor. In the winter she mostly uses the downstairs unit because the volume of warm air __________ warming the whole house through __________.
Question 4 options:
rises, convection
sinks, conduction
rises, conversion
sinks, radiation
Question 5 (1 point)
The prevailing westerlies are global winds that move from west to east and push most weather in this direction in the United States.
Question 5 options:
True
False
Question 6 (1 point)
Due to the Earth's rotation, global winds follow a curved path known as___.
Question 6 options:
Sea breezes
Wind Direction
Coriolis effect
Wind Chill effect
Mention three careers that have to do with STEM. Use complete sentences when you answer.
A sample of oxygen had an initial volume of 4.0L and was at a standard pressure of 10 atm, what would the new volume be if the pressure was increased to 25.00atm?
The new volume would be 1.6 L
How to calculate the new volume of a substance if pressure changes?The best way to calculate the volume of a substance in this situation is to use Boyle's law:
P1V1 = P2V2
In this formula, the initial pressure multiplied by the initial volume is equivalent to the second pressure multiplied by the volume.
Let's now use the values given:
P1V1 = P2V210atm x 4 L = 25atm x V2V2 = 10 atm x 4 L / 25 atmV2= 40 /25V2 = 1.6 LLearn more about Volume in: https://brainly.com/question/1578538
Please help..... :(((
The last part says group 2 if you’re wondering
What type of reaction is C2H4+O2=CO2+H2O
Answer:
It is combustion because C2H4 is reacting with O2, and creates CO2 and H2O
The type of chemical reaction which is given in the question is combustion reaction.
What is combustion reaction?Combustion reactions are those reactions in which hydrocarbon will burn in the presence of oxygen and will form water molecules and carbon dioxide gas.
In the given chemical reaction ethene (C₂H₄) is a hydrocarbon which reacts with oxygen gas to produce water (H₂O) and carbon dioxide (CO₂), so the given reaction is combustion reaction.
Hence the given reaction is a combustion reaction.
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Q7: Three identical flasks contain three different gases at standard temperature and pressure. Flask A contains
CH4, flask B contains O3, and flask C contains N2. Which flask contains the largest number of molecules?
Answer:
Flask A
Explanation:
Cause it has high gas temperature
Consider the following reversible reaction.
Upper C (s) + Upper O Subscript 2 Baseline (g) double arrow Upper C Upper O Subscript 2 Baseline (g)
What is the equilibrium constant expression for the given system?
k Subscript e q Baseline = StartFraction left-bracket Upper C Upper O Subscript 2 Baseline right-bracket Over left-bracket Upper C right-bracket left-bracket Upper O Subscript 2 Baseline right-bracket EndFraction
k Subscript e q Baseline = StartFraction left-bracket Upper C Upper O Subscript 2 Baseline right-bracket Over left-bracket Upper O Subscript 2 Baseline right-bracket EndFraction
k Subscript e q Baseline = StartFraction left-bracket Upper C right-bracket left-bracket Upper O Subscript 2 Baseline right-bracket Over left-bracket Upper C Upper O Subscript 2 Baseline right-bracket EndFraction
k Subscript e q Baseline = StartFraction left-bracket Upper O Subscript 2 Baseline right-bracket Over left-bracket Upper C Upper O Subscript 2 Baseline right-bracket EndFraction
Answer:
Keq = [CO₂]/[O₂]
Explanation:
Step 1: Write the balanced equation for the reaction at equilibrium
C(s) + O₂(g) ⇄ CO₂(g)
Step 2: Write the expression for the equilibrium constant (Keq)
The equilibrium constant is equal to the product of the concentrations of the products raised to their stoichiometric coefficients divided by the product of the concentrations of the reactants raised to their stoichiometric coefficients. It only includes gases and aqueous species. The equilibrium constant for the given system is:
Keq = [CO₂]/[O₂]
Answer:
C on edge
Explanation:
got it correct :)
2. A graduated cylinder is filled to 25.0 mL with liquid. A solid object is added to the liquid and
the new volume is recorded at 34.2 mL. The mass of the solid object is 64.5 g. What is the
density of the solid object?
B. Assume you have a 500 g sample of a radioactive isotope with a half-life of 100 years. Fill in the
table showing how many grams of material will remain after the indicated time has passed. (2 points)
see screenshot for chart data
62.5 grams of material will remain after the indicated time has passed.
What are isotopes?Any of two or more species of atoms of a chemical element with the same atomic number and nearly identical chemical behaviour but with different atomic mass or a mass number and different physical properties.
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Changing the size and shapes of wood would be a chemical change.
O True
O False
Answer:
False.
Explanation:
False because there's no chemicals making change. its a physical change
Select all of the following that are true about your Zn-Ag cell.
a. Ag is gaining electrons. Zn is getting oxidized.
b. Electrons travel toward the Ag half-cell.
c. Ag is getting reduced.
d. Electrons travel away from the Zn half-cell.
e. Zn is losing electrons. Zn2 is gaining electrons.
f. Ag is getting oxidized. Electrons travel toward the Zn half-cell.
g. Electrons travel away from the Ag half-cell. Zn2 is getting reduced.
h. Ag is losing electrons. Incorrect: Your answer is incorrect.
Answer: The correct statements are :
a. Ag is gaining electrons. Zn is getting oxidized.
b. Electrons travel toward the Ag half-cell.
c. Ag is getting reduced.
d. Electrons travel away from the Zn half-cell.
Explanation:
Galvanic cell is a device which is used for the conversion of the chemical energy produces in a redox reaction into the electrical energy.
The standard reduction potential for zinc (Zn) and silver (Ag) are as follows:
[tex]E^0_{Zn^{2+}/Zn}=-0.76V[/tex]
[tex]E^0_{Ag^{+}/Ag}=+0.80V[/tex]
Reduction takes place easily if the standard reduction potential is higher (positive) and oxidation takes place easily if the standard reduction potential is less (more negative).
Here Zn undergoes oxidation by loss of electrons, thus act as anode. Silver undergoes reduction by gain of electrons and thus act as cathode. Thus the electrons will travel from Zn half cell to Ag half cell.
Anode : [tex]Zn\rightarrow Zn^{2+}+2e^-[/tex]
Cathode: [tex]Ag^++e^-\rightarrow Ag[/tex]
The correct statements are :
a. Ag is gaining electrons. Zn is getting oxidized.
b. Electrons travel toward the Ag half-cell.
c. Ag is getting reduced.
d. Electrons travel away from the Zn half-cell.
The correct statements are :
a. Ag is gaining electrons. Zn is getting oxidized.
b. Electrons travel toward the Ag half-cell.
c. Ag is getting reduced.
d. Electrons travel away from the Zn half-cell.
Galvanic Cell:Galvanic cell is a device which is used for the conversion of the chemical energy produces in a redox reaction into the electrical energy.
The standard reduction potential for zinc (Zn) and silver (Ag) are as follows:
[tex]E^0_{Zn^{2+}/Zn}=-0.76 V\\\\E^0_{Ag^{+}/Ag}=+0.80 V[/tex]
Reduction takes place easily if the standard reduction potential is higher (positive) and oxidation takes place easily if the standard reduction potential is less (more negative).
Here Zn undergoes oxidation by loss of electrons, thus act as anode. Silver undergoes reduction by gain of electrons and thus act as cathode. Thus the electrons will travel from Zn half cell to Ag half cell.
Anode : [tex]Zn---- > Zn^{2+}+2e^-[/tex]
Cathode : [tex]Ag^++e^----- > Ag[/tex]
The correct statements are :
a. Ag is gaining electrons. Zn is getting oxidized.
b. Electrons travel toward the Ag half-cell.
c. Ag is getting reduced.
d. Electrons travel away from the Zn half-cell.
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True or false. The geological features of the eastern part of South America and western Africa matched each other.
Answer:
True
Explanation:
If you look at a map they look like they connect and the have similarities like mountains
Answer:
It is true c:, I hope I helped yoy
explain the following terms using examples basic oxide acidic oxide an amphoteric oxide
Answer:
Example of basic Oxide: sodium oxide which reacts with water to produce sodium hydroxide.
Example of Acidic Oxide: SO² in acidic oxide reacts with water and produces an acid.
Example of Amphoteric Oxide: ZnO(s)+2HC(aq)→ ZnCI2(aq)+H2O (I)
Explanation:
Hope this helped Mark BRAINLEST!!!!
Which of the following is a physical change? (1 point)
A) Turning a solid sodium and chlorine gas into salt
B) burning a piece of wood
C) Forming a mixture
D) Food turning into waste in the intestines
The physical change is Forming a mixture. Therefore option C is correct.
A) Turning a solid sodium and chlorine gas into salt is a chemical change, not a physical change.
B) Burning a piece of wood is a chemical change because the wood is being transformed into new substances (ash, gases, etc.) through a chemical reaction with oxygen.
C) Forming a mixture is a physical change because it involves combining two or more substances without changing their chemical identities.
D) Food turning into waste in the intestines is a chemical change that involves the breakdown of complex molecules into simpler ones through chemical reactions.
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Which of the following is an example of a plant with a life cycle adaptation?
Answer:it's a
Explanation:
if you are adapting to an environment you must make change for the greater good. it's a
Answer:
its D
Explanation:
i got it on my quiz
How many moles is 8.42 x 10^22 representative particles of iron (III) oxide?
Answer:
1 Mole = 602 billion trillion. 602,000,000,000,000,000,000,000; 6.02 X 1023 (this is known as Avogadro's number) ... 1 mole of H2O= about 1/3 of a cup (18 mL). It is helpful in ... x 1023 particles. Note: Particles could refer to atoms, molecules, formula units ... How many moles of Sulfur (S) are in 1.8 x 10 24 atoms of sulfur ?
Explanation:
Rotation: Choose ALL that are TRUE (15 points for you, Sorry I can't find the answer to it..)
Question 2 options:
Earth spins on its axis and has no tilt.
A day on a planet is the time it takes the planet to complete one rotation on its axis
A year on a planet is the time it takes the planet to complete one rotation on its axis
Earth spins on its axis at a 23.5 degree tilt
A day on a planet is the time it takes the planet to complete one rotation on its axis and Earth spins on its axis at a 23.5 degree tilt are the true statements.
What is rotation?Rotation is a process in which any body show movement of 360 degree at their own place.
Earth do rotation at its own place all the time with little tilt position of 23.5 degree and due to this day and night occurs in the earth. And earth do revolution in 365 days around the sun in the orbital and due to this movement different seasons occur in the earth.
Hence, option (2) & (4) is correct, i.e. Earth spins on its axis at a 23.5 degree tilt and a day on a planet is the time it takes the planet to complete one rotation on its axis.
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How many moles is 130g of CoCl2
Answer:
1 mol
Explanation:
The mass of CoCl2 is 129.83. 130 divided by the mass is 1. This is to convert the mass given to mols that exist in the sample.
Which statement is correct for a plant cell?
O A plant cell membrane forms a thick wall.
O A plant cell does not have a cell membrane,
O The cell membrane is inside the cell wall,
O The cell membrane is outside the cell wall,
Answer:
The cell membrane is inside the cell wall
Explanation:
If the temperature of 96.5 g of water increases from 25.2 YC to 37.6 YC, how much heat did the water absorb?
Answer:
Q = 5,006.6 J
Explanation:
Hello there!
In this case, for these calorimetry problems, it is possible for us to compute the heat absorbed or released by a substance by considering the involved mass, specific heat and temperature change:
[tex]Q=mC(T_2-T_1)[/tex]
Thus, since the mass of water is 96.5 g, its specific heat is widely known as 4.184 J/g°C and the temperature increases, the resulting heat turns out to be:
[tex]Q=96.5g*4.184\frac{J}{g\°C} (37.6\°C-25.2\°C)\\\\Q=5,006.6J[/tex]
Best regards!
The given values are:
Temperature,
[tex]T_1 = 25^{\circ} C[/tex][tex]T_2 = 37.6^{\circ} C[/tex]then,
[tex]\Delta T = T_2-T_1[/tex][tex]= 37.6-25.2[/tex]
[tex]= 12.4^{\circ} C[/tex]
Mass,
[tex]m = 96.5 \ g[/tex]As we know the formula,
→ [tex]Q = mC\Delta T[/tex]
By substituting the values, we get
[tex]= 96.5\times 4.184\times 12.4[/tex]
[tex]= 5006.6 \ J[/tex] (required heat)
Thus the response above is right.
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Hydrochloric acid (HCl) and sodium sulfide react by forming the gas Hydrogen sulfide and aqueous sodium chloride. Write the complete and net ionic equation for the reaction
Answer:
0.219 mol HCI
Explanation:
Iron(II) sulfide reacts with hydrochloric acid according to the reaction:
FeS (s) + 2HCl (aq) → FeCl2 (s) + H2S (g)
A reaction mixture initially contains 0.223 mol FeS and 0.665 mol HCl.
Once the reaction has occurred as completely as possible, what amount (in moles) of the excess reactant remains?