In system A: A gas and a solid react to form a new solid product. The system entropy decreases.
In System B: Rubbing alcohol evaporates on the skin. Liquid alcohol is converted to gas by evaporation. So the system entropy increases.
What is Entropy?Entropy is a thermodynamic quantity measure the degree of disorder of a certain system.
Gases have larger entropy compared to liquids and which is larger than solids.
System A: When a gas convert to a solid, its entropy decreases because solids have less energy and entropy than solids.So, in system A: A gas and a solid react to form a new solid product. The system entropy decreases.System B: Any chemical reaction that increases the number of gas molecules also increases entropy.So, in System B: Rubbing alcohol evaporates on the skin. Liquid alcohol is converted to gas by evaporation. So the system entropy increases.Learn more about entropy here:
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Answer:
System A: The entropy decreases due to the solid having fewer moving particles than the gas .
System B: There is an increase in entropy. The change in the state of a liquid to a gas is an increase in entropy (disorder) because the particles of a gas are moving faster and forming more random arrangements than they are in the more condensed liquid state.
Explanation:
Which balances the equation mg o2 → mgo? mg 2o2 → 4mgo 2mg 2o2 → 2mgo 2mg o2 → 2mgo 2mg 2o2 → 4mgo
The equation which balances the given chemical reaction between magnesium and oxygen is 2Mg + O₂ → 2MgO.
What is balanced equation?Balanced equations are those equations in which each entities present in reactant side as well as on product side is equal.
Given chemical reaction:
Mg + O₂ → MgO
Above reaction is not balanced as number of oxygens are not equal on both sides.
Mg + 2O₂ → 4MgOThis is not a balanced equation as number of magnesium atom is not equal.
2Mg + 2O₂ → 2MgOThis is also not a balanced equation as oxygen atoms are not equal on both sides.
2Mg + O₂ → 2MgOThis is a balanced equation as number of each atoms are equal on both sides.
2Mg + 2O₂ → 4MgOThis is not a balanced equation as number of magnesium atom is not equal.
Hence balanced equation is 2Mg + O₂ → 2MgO.
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5. When baking cookies, it is important to correctly identify the white granular substance you are
putting into the cookies. Instead of sugar, my grandma put 97.21 grams of salt (NaCl) in her
batch of cookies! How many moles of salt were in the cookie dough?
Answer:
I multiply 97.21 by the amount of cookies you have.
Explanation:
i dont know if this is correct but i multiplyed it by two and got 194.42
Which is an example of an accurate manipulation of the ideal gas law?.
The correct manipulation of the ideal gas equation as shown here is (PV)/R=nT.
What is the ideal gas law?
According to the ideal gas law; PV = nRT. Now, this law applies to gases at high temperature and low pressure.
Given this fact, we know that the correct manipulation of the ideal gas equation as shown here is (PV)/R=nT.
Missing parts;
Which is an example of an accurate manipulation of the Ideal Gas Law and explain why?
(PV)/R=nT 1
PV=(nT)/R 2
PV=(RT)/n 3
PV=(nR)/T 4
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Why does Buckminsterfullerene, with a formula of C60, have a simple covalent structure instead of a giant covalent structure?
Answer:
HOPE THIS HELPS
Explanation:
They are made up of large molecules so are not classed as giant covalent networks . Weak intermolecular forces exist between buckyballs. These need little energy to overcome, so substances consisting of buckyballs are slippery and have lower melting points than graphite or diamond .
what is the relationship between sign of a charge and the direction of electrostatic force
Answer:
The direction of the force vector depends on the sign of the charges. If the charges are the same, the force points away from the other charge.
Explanation:
Based on the chemical equation, use the drop-down menu to choose the coefficients that will balance the chemical equation: ()bao2 ()h2so4 → ()h2o2 ()baso4
Based on the given chemical equation, the value of coefficient that is used in the reaction before each molecule is 1.
What is balanced equation?Balanced chemical equations are those equation in which each element is present in equal amount on both side of the chemical reaction.
Given chemical reaction is:
BaO₂ + H₂SO₄ → H₂O₂ + BaSO₄
Above reaction is balanced as all elements are present in equal amounts on both sides. So, the value of coefficients is 1.
Hence the required coefficients is 1.
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Answer:
Every single box is 1.
Explanation:
Why is it impossible to measure the standard reduction potential of a single half-reaction?.
wrwtx 2m2q/qre .3dqs. rqxq3
shape to quantity
What is the molarity of a solution that contains 6 moles of CaCl2 in 4 liters of solution?
A- 1.5M
B- 3.5M
C-3M
D-6M
Answer:
1.5 M
Explanation:
Molarity is mols/L
take 6moles÷4 L = 1.5M or mol/L
hope this helps, good luck!
How many moles of 02 should be supplied to burn 1 mol of C3H8(propane) molecules in a camping stove?
Answer:
This tells you that when 1 mole of propane undergoes combustion, 3 moles of carbon dioxide are produced. You can thus say that when 2.0 moles of propane react, you will get 2.0moles C3H8 ⋅ 3.moles CO2 1mole C3H8 = 6.0 moles CO2
Explanation:
An unknown amount of gas has a volume of 12 L and a pressure of 5.6 atm. If the temperature is 205K, how many moles of gas are present
The number of moles of the gas present is 4 moles.
To calculate the numbers of moles of the gas present, we use the formula below.
Formula:
PV = nRT............. Equation 1Where:
P = PressureV = Volumen = Number of moles of the gasR = molar gas constantT = Temperature.Make n the subject of the equation
n = PV/RT............ Equation 2From the question,
Given:
P = 5.6 atmV = 12 LT = 205 KR = 0.0821 L.atm.K⁻¹.mol⁻¹Substitute these values into equation 2
n = (5.6×12)/(0.0821×205)n = 67.2/16.8305n = 3.99n ≈ 4 molesHence, the number of moles of the gas present is 4 moles.
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What are three ways to increase the rate of solvation.
Answer:
The rate of solvation is depends on temperature and surface area. Increasing the temperature of the solvent increases the rate of solvation. Increasing the surface area of the solute increases the rate of solvation. Also, agitating the system increases the rate of solvation.
Explanation:
hope this helps.
Increasing the concentration of a reactant shifts the position of chemical equilibrium towards formation of more products. What effect does adding a reactant have on the rates of the forward and reverse reactions?.
Answer:
A.There is no effect on the forward and reverse reactions. For an equilibrium reaction, the forward and reverse rates are always equal.
B. Both the forward and reverse reactions speed up by the same amount.
C. The forward reaction speeds up immediately. As more product is made, the reverse reaction starts to speed up as the forward reaction starts to slow down until they are equal.
D. The forward reaction slows down initially. As the reaction proceeds, the reverse reaction slows down to meet the new forward reaction.
E. The forward reaction speeds up. Eventually, production of the product speeds up the reverse reaction rate to match the new forward rate.
F. It is impossible to say without more specific information.
Explanation:
How many hydrogen atoms (H’s) are there in the following compound: 5H20
A. 2
B. 10
C. 5
D. 20
Answer:
10 atoms
( 5 molecules )......
identify the particles that facilitate the electric conductivity of sodium metal
Answer:
Sodium metal will conduct electricity in both a solid and liquid state, due to 'a sea' of delocalised electrons which can move and are able to carry charge
Sodium metal will conduct electricity only when it is in a liquid state or in solution because of the ionic state which are free to move in this state, allowing them to carry charge and conduct electricity.
What are free electrons ?An electron within a conducting substance (as in a Sodium metal) but not permanently attached to any atom.
Sodium metal will conduct electricity only when it is in a liquid state or in solution because of the ionic state which are free to move in this state, allowing them to carry charge and conduct electricity.
It also have 'a sea' of delocalised electrons which can move and are able to carry charge.
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is a condition characterized by an overactive thyroid gland.
A. Acromegaly
B. Dwarfism
C. Diabetes insipidus
D. A goiter
For an ideal gas, which pairs of variables are inversely proportional to each other (if all other variables are held constant)?
1. V and T
2. n and V
3. T and n
4. P and T
i am 9 and i'm at 3th grade
What is the core of the earth made of?
Answer:
The core of the earth is made of iron-nickel alloys.
If your sample of vinegar is approximately 4.76% (w/w), what volume should you use so that approximately 40 mL of 0.1 M NaOH is required to neutralize your sample of vinegar
Based on the concentrations given, the volume of vinegar required is 5.04 mL.
What is the concentration of the vinegar solution?The concentration of a solution is the amount of solute in a given volume of solution.
Concentration can be expressed as:
molar concentration percentage concentrationThe concentration of the vinegar solution is 4.76% (w/w). This means that 4.76 g of vinegar is present in 100 g of solution.
Mass of vinegar = 4.76 g
molar mass if vinegar = 60 g/mol
moles of vinegar = 4.76/60 = 0.0793 moles
volume of solution/water = 100 mL or 0.1 L
Molarity of vinegar = 0.0793/0.1 = 0.793 M
1 mole of vinegar reacts with 1 mole of NaOH
let the volume of vinegar required be V
0.793 M × V = 40 × 0.1
V = 4/0.793
V = 5.04 mL
Therefore, the volume of vinegar require is 5.04 mL.
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Theoretical yield: 35.0g
Actual yield: 27.7g
What is the percent yield?
Answer:
Percentage yield=79.14%
Explanation:
Percentage yield=(Actual yield/theoretical yield)*100
Percentage yield=27.7g/35.0g*100
Percentage yield=79.14%
The letters Cu, C, and Ca are all chemicals for elements
True or false
Answer:
true
Explanation:
cu is copper, c carbon, ca calcium
Does anyone know this one?
This part is just telling you what they mean by hallowed be Your name is
Hope this helps :))
This is the probability distribution of an electro in a atom or molecule
Answer:
electron orbitals (okay nayn manghula kana Lng)
A student prepared a stock solution by dissolving 15. 0 g of koh in enough water to make 150. Ml of solution. She then took 15. 0 ml of the stock solution and diluted it with enough water to make water to make 65. 0 ml of a final solution. What is the concentration of koh for the final solution?.
weight of dissolving KOH is=10 g KOH molecular weight is= 56.1 moles
Have a nice day!
Which statement best explains why the virus that causes dog flu does not infect humans? In other words, why is this type of flu specific to dogs?
The dog flu virus does not often come into contact with human cells.
The replication cycle of dog flu virus is must slower inside a human cell.
The dog flu virus interacts specifically with receptors on the surface of dog cells.
The toxins produced by the dog flu virus are not toxic to human cells.
Answer:
I believe your answer is : The dog flu virus interacts specifically with receptors on the surface of dog cells.
Explanation:
I hope this helps you :)
Pls mark brainleist :P
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Tori
Gregor Mendel's work helped to
support the ____.
Answer:
I believe the answer is C.
Explanation:
He studied cell division.
43. 5 g of cesium explosively reacts with water to form hydrogen gas and cesium hydroxide. How many moles of hydrogen gas were formed?
Answer:
See the attached images for solution.
Explanation:
When does evaporation take place?
A.when water is cooled
B.when water is heated
C.when water is frozen
D.when water is filtered
Its in science im grade 4
Calculate the number of grams needed to make 250 mL of 0.150 M NaOH.
For solving such problems we need to know mole concept,
Here, Volume and Concentration is given so it's so easy to find number of moles. first we have to convert volume from ml to litre and and then multiply by the concentration of NaOH:
★ Volume of NaOH = 250ml = 250 × 10⁻³ = 0.25L
★ Concentration of NaOH = 0.15 mol/L
Now, let's find the number of moles:-
Number of moles = volume × concentration
Number of moles = 0.25*0.15
Number of moles = 0.0375 mol/L
Thereafter, we have to find molar weight of NaOH and for this we have to know atomic mass of these elements:-
Na = 22g
O = 16g
H = 2g
Substitute the value
Molar weight of NaOH = 22+16+2
= 40 g/mol
Mass of NaOH = no. of moles × molar weight
= 0.0375*40
= 1.5 g/mol
Hence, We need 1.5 g /mol to make NaOH.
Which type of chemical reaction occurs in ca cl2 right arrow. cacl2? synthesis combustion single replacement double replacement
The type of chemical reaction occurs when calcium and chloride reacts to form calcium chloride is synthesis reaction.
What is synthesis reaction?Synthesis reaction is also known by the name of combination reaction in which two reactants combine for the formation of the product.
Given chemical reaction is also a synthesis reaction as in that calcium and chloride reacts with each other for the formation of calcium chloride as:
Ca + Cl₂ → CaCl₂
Combustion reaction are those in which carbon dioxide and water is produced, but in given reaction that is not happening so that was not combustion reaction.In replacement reaction one atom of any reactant will replace by another atom, but this is not the case in given reaction.In double replacemnt two atoms or molecules will replace, so given reaction is not that.Hence given chemical reaction is a synthesis reaction.
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Answer:
B, synthesis
Explanation:
Edge 2022
acides and basis
50 points,s
only smart people can answer
Answer:
this is not the full question
[tex]\\ \rm\Rrightarrow pH=-log[H^+][/tex]
[tex]\\ \rm\Rrightarrow pH=-log[2.5\times 10^{-6}][/tex]
[tex]\\ \rm\Rrightarrow pH=-log2.5-log10^{-6}[/tex]
[tex]\\ \rm\Rrightarrow pH=-0.398+6[/tex]
[tex]\\ \rm\Rrightarrow pH=5.602[/tex]
Acidic as pH<7