The always true statement for the freezing of water is that the entropy change of the universe (ΔSₙₙₕₑ) is greater than zero, signaling a spontaneous process.
Explanation:The statement that is always TRUE for the freezing of water is ΔSₙₙₕₑ > 0. During the freezing process, the system which is the water being frozen, undergoes a decrease in entropy (ΔS < 0) since the water molecules become more ordered. However, the entropy change of the surroundings (ΔSₙₙₕₑ) is positive because the heat rejected during freezing increases the entropy of the surroundings even more. As a result, the entropy of the universe increases (ΔSₙₙₕₑ > 0), making the overall process spontaneous as the second law of thermodynamics predicts that the entropy of the universe should increase in a spontaneous process.
What is the change in enthalpy 180 g of water vapor condenses at 100°C
Answer:
407 KJ
Explanation:
Q = m x Hv / M(H2O)
Q = 180 x 40,67/ 18
Q = 407 kJ
-406.7 kJ is the change in enthalpy when 180 g of water vapor condenses at 100°C.
What is enthalpy?Enthalpy is the sum of the internal energy. and pressure times volume. We cannot measure the enthalpy of a system, but we can look at changes in enthalpy.
[tex]H_2O (l)[/tex] → [tex]H_2O (g)[/tex], Δ[tex]H_V[/tex] = - 40.67kJ/mol
Mole of water =[tex]\frac{180g}{18g/mol}[/tex]
Mole of water = 10g
Heat of condensation of 1 mol of water = Δ[tex]H_V[/tex]
= - 40.67kJ/mol
Heat change when 180 g of water condenses at 100° C:
= - 40.67kJ/mol X 10g
= - 406.7 kJ
Hence, -406.7 kJ is the change in enthalpy when 180 g of water vapor condenses at 100°C.
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which statement best describes a newton
What must be balanced on the left side of an equation with the atoms on the right side of the equation? total number of molecules total number of atoms total number of compounds free electrons
Answer:
The total number of atoms must be the same on both sides in order for it to be a balanced chemical equation.
In order to balance a chemical equation with the atoms on the right side of the equation with left side of the equation there must be:
b. total number of atoms
What is a Balanced chemical equation?In a balanced reaction, the reactants go on the left side of the arrow, while the products go on the right side of the arrow. Coefficients (number in front of a chemical formula) indicate moles of a compound. Subscripts (numbers below an atom) indicate the number of atoms in a single molecule.
Thus, option b is correct.
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If you push on a cart, the force of friction will slow it down. Friction is
the conversion of kinetic energy to _____
Select one:
1.heat
2.direction
3.velocity or speed
4.magnetism
Answer:
Heat
Explanation:
Friction can help convert heat into kinetic energy and kinetic energy into heat. Friction can be thought of as particles from different objects hitting each other. Collisions transfer energy converting large scale movement (kinetic energy) into small scale movement (heat).
A balloon with a volume of 1.50 L is compressed to a volume of 0.50 L (at a constant temperature).
a. Do you expect the pressure of the gas in the balloon to increase or decrease? Why?
Answer : The pressure of gas in the balloon will be increases.
Explanation :
Boyle's Law : It is defined as the pressure of the gas is inversely proportional to the volume of the gas at constant temperature and number of moles.
[tex]P\propto \frac{1}{V}[/tex]
From this we conclude that, as the volume of gas increases then the pressure of the gas will be decreases and as the volume of gas decreases then the pressure of the gas will be increases.
As per question, the volume of balloon decreases from 1.50 L to 0.50 L at constant temperature. So, the pressure of gas in the balloon will be increases.
Hnece, the pressure of gas in the balloon will be increases.
The pressure of the gas in the balloon is expected to decrease.
WHAT IS BOYLE'S LAW?Boyle's law states that the volume of a given gas is inversely proportional to the pressure of the gas provided the temperature is constant.
Boyle's law is denoted by the equation: K = P/V.
This means that as the volume of the gas increases, the pressure decreases and vice versa.
Therefore, the pressure of the gas in the balloon is expected to decrease.
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What is the pH range of a base (see diagram below) *Captionless Image Less than 7 equal to 7 greater than 7
Answer:
Greater than 7
Explanation:
The pH scale measures how acidic or basic a substance is.
pH less than 7 - acid (represented by red)
pH equal to 7 - neutral (like water)
pH greater than 7 - base (represented by blue)
Identify three factors that can affect blood pressure
Explanation:
Following factors can affect blood pressure :
Smoking.Lack of physical activity.Too much salt in the diet.What volume of oxygen gas is needed to completely combust 0.202L of butane (C4H10) gas?
Answer:
look at the file :)
Explanation:
According to the stoichiometry of the balanced chemical equation of combustion of butane 1.313 liters of oxygen gas is needed to completely combust 0.202 L of butane gas.
What is chemical equation?Chemical equation is a symbolic representation of a chemical reaction which is written in the form of symbols and chemical formulas.The reactants are present on the left hand side while the products are present on the right hand side.
A plus sign is present between reactants and products if they are more than one in any case and an arrow is present pointing towards the product side which indicates the direction of the reaction .There are coefficients present next to the chemical symbols and formulas .
The first chemical equation was put forth by Jean Beguin in 1615.By making use of chemical equations the direction of reaction ,state of reactants and products can be stated. In the chemical equations even the temperature to be maintained and catalyst can be mentioned.
0.202 liters of butane requires 13/2 of oxygen gas which is 0.202×13/2=1.313 liters.
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2. Let us say we have a birthday's balloon filled with a volume of 8 liters of 25 points
Helium gas and we measure its pressure to be 0.8 atm. Then after, I've
decided to squeeze it to reduce its volume (size) to 0.5 liters (which
about to pop!), what is the balloon's new pressure?
A.12.8 atm
B.12.0atm
C.10.8 atm
D.11.8 atm
Answer:
Option A.12.8 atm
Explanation:
Step 1:
Data obtained from the question.
Initial Volume (V1) = 8 L
Initial pressure (P1) = 0.8 atm
Final volume (V2) = 0.5 L
Final pressure (P2) =?
Step 2:
Determination of the new pressure. The new pressure of the balloon can simply be obtained by applying the Boyle's law equation as follow:
P1V1 = P2V2
0.8 x 8 = P2 x 0.5
Divide both side by 0.5
P2 = (0.8 x 8) / 0.5
P2 = 12.8 atm
Therefore, the new pressure of the balloon is 12.8 atm
How many moles of fluorine gas would occupy a volume of 42.3 L at a pressure of 106.1 kPa and a temperature of 940C?
Answer:
5.7
Explanation:
When energy is changed from one form to another
Answer:
When energy is transformed from one from to another, energy is transferred form one form to another.
Explanation:
While the transformation of energy occur, total energy remains constant.
This is the LAW OF CONSERVATION OF ENERGY.
Which of the following cannot be classified as a mixture? *
O
Milk
Brass
A solution
O
Gold
Answer:
Gold
Explanation:
I think its gold since its a pure element, hope it helped
150.0 grams of iron at 95.0 °C, is placed in an insulated container containing 500.0 grams of water. The temperature of the water increases to 27.2°C. What was the initial temperature of the water? The specific heat of water is 4.18 J/g °C and the specific heat of iron is 0.444 J/g °C
Explanation:
in it I mass=150g,initial temp 1=95,mass2=500g,temp2=?,final temperature=27.2 C1=0.444C2=4.18
using formula
m1c1(final temp-initial temp1) =m2c2(temp2-final temp)
150x0.444(27.2-95)=500x4.18(?-27.2)
66(-67.8)=2000(?-27.5)
-4474.8=2000?-55000
collect like terms
-4474.8+55000=2000?
50525=2000?
divide both sides by 2000
2000?/2000=50525/2000
initial temperature =25.26 degree Celsius
The initial temperature of the water was found to be approximately 25.04°C.
1. Let's calculate the heat lost by the iron first:
Heat lost by iron ([tex]q_{iron[/tex]) = [tex]mass_{iron[/tex] * specific_heat[tex]_{iron[/tex] * ([tex]T_{initial_{iron[/tex] - [tex]T_{final[/tex])
We have:
[tex]mass_{iron[/tex] = 150.0 gSpecific_heat[tex]_{iron[/tex] = 0.444 J/g°C[tex]T_{initial_{iron[/tex] = 95.0°C [tex]T_{final[/tex] = 27.2°CSolving for [tex]q_{iron[/tex]:
[tex]q_{iron[/tex] = 150.0 g * 0.444 J/g°C * (95.0°C - 27.2°C) [tex]q_{iron[/tex] = 150.0 g * 0.444 J/g°C * 67.8°C [tex]q_{iron[/tex] = 4508.52 J2. Next, we calculate the initial temperature of the water using the heat gained by the water ([tex]q_{water[/tex]):
Heat gained by water:
([tex]q_{water[/tex]) = [tex]mass_{water[/tex] * specific_heat[tex]_{water[/tex] * ( [tex]T_{final[/tex] - [tex]T_{initial_{water[/tex])
We have:
[tex]mass_{water[/tex] = 500.0 gspecific_heat[tex]_{water[/tex]= 4.18 J/g°C[tex]T_{final[/tex] = 27.2°CSince [tex]q_{iron[/tex] = [tex]q_{water[/tex], we set up the equation:
4508.52 J = 500.0 g * 4.18 J/g°C * (27.2°C - [tex]T_{initial_{water[/tex] )Simplify and solve for [tex]T_{initial_{water[/tex]:
4508.52 J = 2090 J/°C * (27.2°C - [tex]T_{initial_{water[/tex]) 4508.52 J / 2090 J/°C = 27.2°C - [tex]T_{initial_{water[/tex] 2.16 °C = 27.2°C - [tex]T_{initial_{water[/tex] [tex]T_{initial_{water[/tex] = 27.2°C - 2.16 °C [tex]T_{initial_{water[/tex] = 25.04°Cimagine some radish plants are planted too close. they are well- fed and well- watered. why might they be growing to be tall and spindly?
Due to plantation of some radish plants too closely, they compete with each other for nutrients and water. So, they grow long and thin.
Explanation:
Radishes grows tall and spindly due to hot weather, unfit soil, and conflict with other plants. More nitrogen in the soil may also cause radishes to grow long and thin.
Radishes sometimes grow “out of the ground” because either the soil is compacted or the seeds were planted too shallow.
Radishes, like carrots, prefer to grow in loose, sandy soil. This means that the soil should be smooth, with no rocks, roots, or dirt clumps.
Due to competition with other plants (including nearby radishes!) When there are too many plants in one area, they will compete with one another for nutrients and water.
In addition, when radishes are planted too close together, the roots physically have nowhere to go. Since they cannot grow wider, they instead grow longer, going deeper into the soil in search of nutrients and water.
Radish plants planted too close together may become tall and spindly due to competition for light, resulting in a survival tactic of prioritizing height over girth to outcompete for sunlight, a process often aided by phytohormones.
If some radish plants are planted too close together, despite being well-fed and well-watered, they may grow to be tall and spindly due to a phenomenon known as competition for light. Plants grown in close proximity may sense the shading from their neighbors and respond by increasing their shoot elongation to access more light. This is a survival strategy where plants prioritize height over girth to outcompete neighboring plants for sunlight. In doing so, they often become weaker structurally and exhibit a 'stretched' appearance which is referred to as etiolation. Additionally, phytohormones such as gibberellins may contribute to this growth pattern, which enhances stem elongation especially when plants are densely planted and compete for sunlight.
City A is located along the shore of an ocean. City B is at the same latitude and altitude, but it is located
about 124 miles (200 km) inland, away from any large bodies of water. Which of the following
statements most likely describe these two cities? Check all that apply.
In the summer, the daytime temperature in City A is typically lower than the daytime temperature
in City B.
In the winter, the daytime temperature in City B is typically lower than the daytime temperature
in City A
City A typically has both higher high temperatures and lower low temperatures than City B.
Answer:
A and B
Explanation:
Answer: A and B.
Explanation:
I took the enginuidy
!!Help ASAP!!! Imagine you have just baked a pizza in the oven. You've only let it cool for a minute, but you're hungry and you want to take a bite. To minimize your chances of burning your mouth, should you take a bite with a lot of sauce on it or a bite near the crust that contains very little sauce? Explain your answer based on what you have learned about thermal energy and specific heat capacity. (5 points) Think about how the specific heat capacity of the watery sauce compares with that of the much drier pizza crust.
Answer:
bite where there is less sauce.
Explanation:
i just ate a pizza and it worked
Answer:
take a bite near crust
Explanation:
because the sauce is still hot so u will get burned
Suppose 0.09886 M KOH is titrated into 15.00 mL H2SO4 of unknown concentration until the equivalence point is reached. It takes a total volume of 29.25 mL KOH to neutralize the H2SO4. How many moles of acid were neutralized during the titration? Express the answer to five significant figures. 0.00028917 moles acid
Answer:0.0014458
That’s the right one
Answer:
0.0014458
Explanation:
edg
what happens when the amplitude of a sound wave changes?
The amplitude of a sound wave determines its loudness. A higher amplitude results in a louder sound, and a lower amplitude results in a softer sound.
In Physics, the amplitude of a sound wave determines its loudness or volume. A larger amplitude means a louder sound, while a smaller amplitude means a softer sound.
For instance, a shout has a higher amplitude compared to a whisper. As sound travels further from its source, its amplitude decreases because the energy of the wave spreads over a larger area and is absorbed by objects like eardrums, converting to thermal energy.This spread of energy follows the inverse square law, meaning that doubling the distance from the sound source reduces its amplitude to one-quarter of its original value. This causes the sound to become softer the further it travels.
What occurs during chemical reaction
Answer:
In a chemical reaction, the atoms and molecules that interact with each other are called reactants. No new atoms are created, and no atoms are destroyed. In a chemical reaction, reactants contact each other, bonds between atoms in the reactants are broken, and atoms rearrange and form new bonds to make the products.
During a chemical reaction, various changes take place at the molecular level as substance are transformed into new substances (products).
How do we explain?Chemical reactions involve the breaking and formation of chemical bonds between atoms and molecules. Here's what occurs during a chemical reaction:
Breaking and Formation of Bonds, the bonds between atoms in the reactants are broken. These bonds are typically covalent or ionic bonds. This requires an input of energy called the activation energy. Bonds are broken as reactant molecules collide and interact.
Once the bonds are broken, the atoms are rearranged to form new molecules or compounds. The atoms do not disappear; they are rearranged into new combinations.
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_____ H2O2 → _____ H2O + _____ O2
2. How many moles of oxygen form from 0.51 moles of hydrogen peroxide?
Answer : The number of moles of oxygen formed are, 0.255 moles.
Explanation :
The given chemical reaction is:
[tex]H_2O_2\rightarrow H_2O+O_2[/tex]
This reaction is an unbalanced chemical reaction because in this reaction number of oxygen atoms are not balanced.
In order to balance the chemical equation, the coefficient '2' put before the [tex]H_2O_2[/tex] and [tex]H_2O[/tex] then we get the balanced chemical equation.
The balanced chemical reaction will be:
[tex]2H_2O_2\rightarrow 2H_2O+O_2[/tex]
Now we have to calculate the number of moles of oxygen formed.
From the balanced chemical reaction we conclude that,
As, 2 moles of hydrogen peroxide react to give 1 mole of oxygen
So, 0.51 moles of hydrogen peroxide react to give [tex]\frac{0.51}{2}=0.255[/tex] mole of oxygen
Therefore, the number of moles of oxygen formed are, 0.255 moles.
How many grams of CO2 will be produced from 12.0 g of CH4 and 133 g of O2 ?
To find the amount of CO₂ produced from 12.0 g of CH₄ and 133 g of O₂, we write the balanced chemical equation for the combustion of methane, find the limiting reactant, which is CH₄, and then use stoichiometry to calculate that 32.95 grams of CO₂ will be produced.
The question involves a stoichiometry calculation in Chemistry where we need to determine how many grams of CO₂ will be produced from a given amount of CH₄ and O₂ based on a chemical reaction.
The first step is to write the balanced chemical equation for the combustion of methane:
CH₄(g) + 2 O₂(g) ⇒ CO₂(g) + 2 H₂O(l)
Next, we calculate the moles of CH4 using its molar mass:
(12.0 g CH₄) / (16.04 g/mol) = 0.7484 mol CH₄
Then, we need to check if oxygen is in excess by calculating the moles of O₂:
(133 g O₂) / (32.00 g/mol) = 4.156 mol O₂
Now, since the reaction requires 2 moles of O₂ for every mole of CH₄, we have more than enough O₂ to react with CH₄, which means CH₄ is the limiting reactant.
According to the balanced equation, 1 mole of CH₄ produces 1 mole of CO₂. Therefore, 0.7484 mol of CH₄ will produce 0.7484 mol of CO₂.
Finally, we calculate the mass of CO₂ produced:
(0.7484 mol CO₂) x (44.01 g/mol) = 32.95 g CO₂
Thus, 32.95 grams of CO₂ will be produced from the reaction between 12.0 g of CH₄ and 133 g of O₂.
Balance the equation H2+O2=H2O.
Answer:
the answer is written in the picture.
Explanation:
Answer:
2H2 + O2 = 2H2O
Explanation:
To balance the equation, you must place coefficients behind the element and have equal amounts of atoms on both sides. In this case, to balance the equation, it would read:
2H2 + O2 = 2H2O
A cylinder of O2 gas occupies a volume of 60.50 L at STP. How many moles of oxygen
gas are in the cylinder?
Answer:
The answer to your question is 2.52 moles
Explanation:
Data
Volume = 60.5 l
Temperature = 20°C
Pressure = 1 atm
Constant of ideal gases = R = 0.082 atm l/mol°K
Formula
PV = nRT
-Solve for n
n = PV / RT
-Convert temperature to °K
Temperature = 20 + 273
= 293°K
-Substitution
n = (1 x 60.5) / (0.082 x 293)
-Simplification
n = 60.5 / 24.026
-Result
n = 2.52 moles
Which statement best describes what makes a base weak?
A base is weak when it forms few ions in water.
0 A base is weak when only a little of it is dissolved in water.
1 A base is weak when its concentration is high.
O A base is weak when it totally forms ions in water.
A base is weak when only a little of it dissolved in Water.
It images help u...
Answer:
A) base is weak when it forms few ions in water.
Explanation:
I just took the final
It earth is like a greenhouse carbon gases in the atmosphere are like the
A: planets
B:glass
C:sun
D:ground
Identify whether each compound will ionize or dissociate in water. Sodium sulfate (Na2SO4) Ammonium phosphate ((NH4)3PO4) Sulfuric acid (H2SO4) Potassium iodide (KI)
Answer:
Sodium Sulfate: Dissociate
Ammonium Phosphate: Dissociate
Sulfuric Acid: Ionize
Potassium Iodide: Dissociate
Perchloric Acid: Ionize
Cesium Chloride: Dissociate
Nitric Acid: Ionize
Sodium Sulfate: Dissociate
Ammonium Phosphate: Dissociate
Sulfuric Acid: Ionize
Potassium Iodide: Dissociate
Perchloric Acid: Ionize
Cesium Chloride: Dissociate
Nitric Acid: Ionize
What do ionize and dissociate suggest?Ionization is described because of the method wherein new charged debris is produced. Dissociation is described as the technique wherein a charged particle is separated from the prevailing compound. that is an irreversible system. this is a reversible process.
What's the distinction between dissolving and ionizing?Dissolution is any procedure that consequences in stages (whether it's liquid-liquid for acetic acid or stable-liquid for sodium chloride) creating an unmarried segment. Ionic compounds dissociate to try this, however many compounds (glucose, acetone, and many others.) can have interaction sufficient with water enough to dissolve without ionizing.
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What is the molar mass of Cu(OH)2?
Answer:
97.561 g/mol
Explanation:
The molar mass of Cu(OH)₂ is 97.57 g/mol. This is calculated by adding the atomic masses of copper, oxygen, and hydrogen in the compound. Each element's atomic mass is multiplied by the number of its atoms in the formula.
To find the molar mass of Cu(OH)₂, you need to add up the atomic masses of all the atoms in the compound:
Copper (Cu): 1 atom × 63.55 g/mol = 63.55 g/mol
Oxygen (O): 2 atoms × 16.00 g/mol = 32.00 g/mol
Hydrogen (H): 2 atoms × 1.01 g/mol = 2.02 g/mol
Adding these together gives the total molar mass of Cu(OH)₂:
Cu(OH)₂ molar mass = 63.55 g/mol + 32.00 g/mol + 2.02 g/mol
= 97.57 g/mol
Thus, the molar mass of Cu(OH)₂ is 97.57 g/mol.
What is the specific heat of copper if a 105 g sample absorbs 15200 joules and the change in temperature is 377 0C ? (Draw a temperature time graph)
Answer : The specific heat of copper is, [tex]0.384J/g^oC[/tex]
Explanation :
Formula used :
[tex]q=m\times c\times \Delta T[/tex]
where,
q = heat absorb = 15200 J
m = mass of sample = 105 g
c = specific heat capacity of copper = ?
[tex]\Delta T[/tex] = change in temperature = [tex]377^oC[/tex]
Now put all the given values in the above formula, we get:
[tex]15200J=105g\times c\times 377^oC[/tex]
[tex]c=0.384J/g^oC[/tex]
Therefore, the specific heat of copper is, [tex]0.384J/g^oC[/tex]
Which property describes a mixture? Select three options.
Answer:
It can be separated by physical methods.
2) It can appear different from different sources.
3) It cannot be described by a chemical symbol or formula.
Explanation:
Answer:
1) It can be separated by physical methods.
2) It can appear different from different sources.
3) It cannot be described by a chemical symbol or formula.
Mixture is composed of at least two substances.
Solar power and wind power are similar because
A.
they are both non-renewable energy sources.
B.
they both are powered by water.
C.
they are both dependent upon weather and location.
D.
they both are very expensive to operate.