Answer:
the correct ansewr isA true
During the rock cycle, which of the following types of materials forms as a result of weathering and erosion of rock?
Mention three careers that have to do with STEM. Use complete sentences when you answer.
Fill in the blanks 2. A forest is a purtier of- and following
Answer:
Odors and pollutant gases
Explanation:
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]
Water vapor also enters the atmosphere through —————(2 words), which takes place in many cells and produces water and carbon dioxide.
Answer:
It is photosynthesis and transpiration
hope it helps
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
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.
TRUE OR FALSE! Please help
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!!!!
10 gram sample of methane (CH 4 ) has the same number of molecules as 10 gram sample of O 2
The given question is incomplete. The complete question is:
10 gram sample of methane [tex](CH_4)[/tex] has the same number of molecules as 10 gram sample of [tex]O_2[/tex]. True or False
Answer: Thus the statement is False.
Explanation:
According to avogadro's law, 1 mole of every substance contains avogadro's number [tex]6.023\times 10^{23}[/tex] of particles.
To calculate the moles, we use the equation:
[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text {Molar Mass}}[/tex]
1. [tex]\text{Number of moles for methane}=\frac{10g}{16g/mol}=0.625moles[/tex]
Now 1 mole of [tex]CH_4[/tex] molecule contains = [tex]6.023\times 10^{23}[/tex] of molecules
0.625 mole of [tex]CH_4[/tex] molecule contains = [tex]\frac{6.023\times 10^{23}}{1}\times 0.625=3.76\times 10^{23}[/tex] molecules
2. [tex]\text{Number of moles for oxygen}=\frac{10g}{32g/mol}=0.3125moles[/tex]
Now 1 mole of [tex]O_2[/tex] molecule contains = [tex]6.023\times 10^{23}[/tex] of molecules
0.3125 mole of [tex]O_2[/tex] molecule contains = [tex]\frac{6.023\times 10^{23}}{1}\times 0.3125=1.88\times 10^{23}[/tex] molecules
The number of molecules are different.
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.
Learn more about heat here:
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Helppppp pleaseeee xx
Answer:
2.5 moles of O₂ = 5 moles of H₂O
Explanation:
The balanced equation for the reaction is given below:
2H₂ + O₂ —> 2H₂O
From the balanced equation above,
1 mole of O₂ reacted to produce 2 moles of H₂O.
Finally, we shall determine the number of mole of H₂O produced by the reaction of 2.5 moles of O₂. This can be obtained as follow:
From the balanced equation above,
1 mole of O₂ reacted to produce 2 moles of H₂O.
Therefore, 2.5 moles of O₂ will react to produce = 2.5 × 2 = 5 moles of H₂O.
Thus,
2.5 moles of O₂ = 5 moles of H₂O
True or false sodium chloride is an organic molecule
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 :)
What is the difference between an endothermic and an exothermic reaction?
ANSWER THE QUESTION FOR 67 POINTS!
Answer:
Endothermic Reaction:
These type of reactions are those reactions which absorb energy from the surroundings to form products. They also create a cooling effect in the surrounding as they absorb heat and thus the surrounding area gets cooled.
Exothermic Reaction:
These are reactions that release energy, mostly in the form of heat or light.
The products will release energy there can be a heating effect in the surroundings.
HELP ME SOLVE THIS WORKSHEET
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
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,
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.
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:
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:
Please..................
Sorry so what I think u should do is ask your teach or look up on how to do this problem
g At the start of an experiment, there are 0.200 mol of reactant and 0 mol of product in the reaction vessel. After 25 min, 0.111 mol of reactant (CH3NC) remain. There are ________ mol of product (CH3CN) in the reaction vessel. At the start of an experiment, there are 0.200 of reactant and 0 of product in the reaction vessel. After 25 , 0.111 of reactant remain. There are ________ of product in the reaction vessel. 0.022 0.089 0.311 0.111 0.200
Answer: b. 0.089
Explanation: The Law of Conservation of Mass states that when in a chemical or physical change, the products' mass of a chemical reaction will equal to the mass of the reactants' mass or in other words, mass cannot be created or destroyed.
The same can be said to moles, since, they are also measures of mass.
In the reaction:
[tex]CH_{3}CN_{(g)} \rightarrow CH_{3}NC_{(g)}[/tex]
initially there were 0.200 mol of reactant. After 25 min, there are 0.111 mol left.
This means that 0.089 mol of reactant "transformed" into product.
Therefore, in the reaction vessel, there are 0.089 mol of product.
Please help..... :(((
The last part says group 2 if you’re wondering
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.
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.
To know more about rotation, visit the below link:
https://brainly.com/question/15734021
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.
Learn more about the isotopes here:
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1. What are the two properties a force have that make
it a vector quantity? (Identify the force )
Answer:
magnitude and direction
Which of the following has the lowest entropy?
O A. Water solution
B. Water vapor
C. Ice
D. Water
Water
Answer: Ice
Explanation:
Answer:
the answer is B.
Explanation:
Because unlike the closed system, in which the entropic process cannot stop itself
How many moles of Ca(NO3)2 must be added to 1.0 L of a 0.255 M HF solution to begin precipitation of CaF2(s)
Answer:
6.1×10^(-10) mol
Explanation:
CaF2(s) -----------> Ca2+(aq) +2F-(aq)
Ksp = [Ca2+][F-]^2
Given data
[F-] = 0.255 M
∴ The concentration of Ca2+required to start the precipitation
[Ca2+] = Ksp / [F-]2
= (4.0 X 10^-11) /(0.255)^2
= 6.1×10^(-10) M
Here the volume is 1.0 L
∴ The number of molesof Ca(NO3)2 must be added to 1.0 L of a1.0 L of a 0.255 M HF solution to begin precipitation ofCaF2 (s)= 6.1×10^(-10) mol