The bromine percentage is 49.42 %
Explanation:
Mass of AgBr precipitated = 0.31 g
Molecular weight of AgBr = 187.77 g mol - 1
moles of AgBr = 0.31 g by 187.77 g mol - 1 = 0.0016509 moles
moles of Br ion = 0.0016509 moles
Mass of Br ion = 0.0016509 moles into 79.904 g mol - 1 = 0.1319 g
The Total mass of compound = 0.2669 g
Percentage of bromine = 0.1319 by 0.2669 = 49.42 percent
Hence the bromine percentage is 49.42 %
A volatile liquid is evaporated in a flask in a boiling a water bath (
Temperature = 100°C) with a volume of 297ml. The evaporated gas is
condensed in the flask and it is found to have a mass of 0.435g.
Atmospheric pressure for that day is 765mmHg. What is the Molar Mass of
the Volatile liquid? Show work
Answer:
Molecular Weight of gas = 44.418 grams/mole
Explanation:
PV = nRT = (mass/f.wt.)RT => f.wt. = mass·R·T/P·V
mass = 0.435g
R = 0.08206·L·atm/mol·K
T = 100°C = 372K
P = (765/760)Atm = 1.01Atm
V = 297ml = 0.297L
f.wt. = (0.435g)(0.08206L·Atm/mol·K)(372K)/(1.01Atm)(0.297L) = 44.418 grams/mole
!!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
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:
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
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
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.
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
what does chemical reaction mean?
A process that involve rearrangement of the molecules or ionic structure of substance as distinct from change in the physical form or a nuclear reactions
I hope you are satisfied with this answer
Final answer:
A chemical reaction is a transformation where reactants are turned into products, involving changes at the atomic level including breaking and forming of bonds. Chemical equations represent these reactions, which must be balanced to reflect the conservation of matter.
Explanation:
A chemical reaction is a process that fundamentally changes one or more substances, known as reactants, into one or more different substances, known as products. These transformations involve a combination, separation, or rearrangement of atoms. During chemical reactions, bonds between atoms in the reactants are broken and new bonds are formed to create the products.
Chemical reactions are depicted using chemical equations, which have the reactants on the left side, an arrow representing “yields”, and the products on the right side. For a chemical equation to be useful or valid, it must be balanced, meaning it respects the law of conservation of mass with the same number and types of atoms on both sides. Examples of chemical reactions include the rusting of iron, the combustion of gasoline in a car's engine, and the metabolic processes within a living cell. In each case, the initial substances or reactants are transformed into different substances with new properties.
It earth is like a greenhouse carbon gases in the atmosphere are like the
A: planets
B:glass
C:sun
D:ground
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
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 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
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).
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
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
Can someone please do the last column for me
Answer:
First one is : London dispersion
Second one is: London dispersion
Third One is : dipole-dipole
Fourth one is : induced dipole
Explanation:
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 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.
_____ 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.
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
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]
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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An aqueous 0.300 M glucose solution is prepared with a total volume of 0.150 L. The molecular weight of
glucose is 180.16
mol
What mass of glucose (in grams) is needed for the solution?
Answer:
8.11g
Explanation:
Given parameters:
Molarity of aqueous solution = 0.3M
total volume = 0.15L
Molecular weight of glucose = 180.6g/mol
Unknown:
Mass of glucose needed in the solution = ?
Solution:
To solve this problem, we need to understand molarity.
Molarity is the number of moles of solute in a given volume of solution. In this problem, the solute here is the glucose and the solvent is water.
Molarity = [tex]\frac{number of moles of solute}{volume of solution}[/tex]
A solution is made up of solute and solvent.
now, let us solve for the number of moles of the solute which is glucose;
Number of moles of glucose = molarity x volume of solution;
= 0.3 x 0.15
= 0.045mole
Now to find the mass of glucose;
mass of glucose = number of moles x molar mass
input the parameters;
Mass of glucose = 0.045 x 180.16 = 8.11g
To determine the amount of glucose needed for the solution, we calculate the number of moles of glucose in the solution and then use the molecular weight of glucose to convert this to grams. Thus, 8.107 g of glucose is necessary for the solution.
Explanation:To figure out how much glucose we need, we'll have to use molarity, which measures the concentration of a solution. The molarity is defined as the number of moles of solute (in this case, glucose) per liter of solution.
Therefore, we first find the number of moles in the 0.150 L solution by multiplying 0.300 M by 0.150 L, which gives us 0.045 moles of glucose. Then, we multiply this by the molecular weight of glucose, which is 180.16 g/mol. Therefore, to create the solution, we'd need 8.107 g of glucose.
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What structures are found in clusters in the mouth and have nerve cells that gather information about whether food is sweet, salty, bitter or sour?
A.
tonsils
B.
saliva glands
C.
taste buds
D.
nostrils
Answer:
taste buds
Explanation:
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.
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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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.
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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Mosquitoes that carry disease-causing organisms from person to person are called _________________.
Answer:
vector
Explanation:
a vector is an organism that transmits a pathogen from organism to organism.