Heat from the burner radiates through the liquid and causes even heating. Due to this reason, the water at the top of the beaker the same temperature as that of the bottom. The correct option is option A.
What is temperature?Temperature is used to measure degree or intensity of heat of a particular substance. Temperature is measured by an instrument called thermometer.
Temperature can be measured in degree Celsius °c, Kelvin k or in Fahrenheit. Temperature is a physical quantity. Heat always flow from higher temperature source to lower temperature source. Heat from the burner radiates through the liquid and causes even heating. Due to this reason, the water at the top of the beaker the same temperature as that of the bottom.
Therefore, the correct option is option A.
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Two solutions are prepared by a chemist. One of the solutions is 150.0 ml of a 3.5 x 10¹5 M HNO3.
The other solution is 250.0 ml of a 0.63 M solution of HNO2.
Compare the pH of each solution.
The pH of the solutions are as follows:
a. pH = 4.4
b. pH = 0.2
What is the pH of a solution?The pH of a solution is a measure of the acidity or basicity of a solution.
The pH is defined as the negative logarithm of the hydrogen ion concentration of a substance.
pH = -log [H⁺]
where [H⁺] is the hydrogen ion concentration
The pH of the solutions are as follows:
a. 150.0 ml of a 3.5 x 10⁻⁵ M HNO3.
pH = -log (3.5 x 10⁻⁵)
pH = 4.4
b. 250.0 ml of a 0.63 M solution of HNO2
pH = -log (0.63)
pH = 0.2
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A compound is composed of element X and hydrogen. Analysis shows the compound to be 80% x by mass, eith three times as many hydrogen as X atomes per molecule. Which element is element X?
Based on the percentage composition and the empirical formula of the compound, the element X is carbon.
What is the element X in the compound?The element X in the compound can be determined from the empirical formula of the compound and the percentage composition by mass of the element x.
The empirical formula of the compound is given from the statement; there are three times as many hydrogens as X atoms per molecule.
Empirical formula = XH₃
Assuming the mass of the compound is 100 g
80 g = X
20 g = 3 H
1 H = 20/3
mass ratio of X and H = 80 : 20/3
Mass ratio of X and H = 12 : 1
Hence, X is carbon.
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Magnetite, Fe3O4, is another ore of iron that contains both Fe²+ and Fe³+.
(a) Deduce the ratio of Fe²+: Fe³+ in Fe3O4.
The ratio of Fe²+: Fe³+ in Fe3O4 is 1:2
What is ore?
An ore is a naturally occurring deposit of geologic material (rock) that contains a sufficient quantity of one or more valuable elements or compounds to be economically mined. Metals such as copper, platinum, iron, lead, gold, silver, aluminium, nickel, and others are among these valuable elements. Nonmetals such as silicon and diamond may be found in ore. These valuable chemicals can be extracted and used in a variety of ways, from jewellery creation to electronic gadget manufacture. Ores vary greatly based on the parent rock's chemical composition as well as the natural mechanism by which they were created.
Mining corporations carefully analyse various issues before deciding to mine because extracting anything from the earth involves time, money, and effort. The ore grade, for example, indicates how much of the desired precious element or combination occurs inside the parent rock. The rock is regarded an ore if the required component is present in sufficient concentration for processing to be viable. Larger grade ores have higher concentrations of the desired ingredient, and vice versa.
Fe304 contains both Fe²+ and Fe³+
Then we have to deduce the ratio of Fe²+ and Fe³+.
We know that
Fe0 + Fe2O3 ---------> Fe3O4
Fe in Fe0 is Fe(II)
Fe in Fe2O3 is Fe(III)
Then we have see that
on combine Fe 2+ with Fe3 , Fe304 is form
Hence,
The ratio of Fe²+: Fe³+ in Fe3O4 is 1:2
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If you want to distinguish between alkanes and alkenes using chemical reactions, which test: the combustion or the bromine is the better one? Explain your answer. Question 2: what you can use to wash the cloth contaminated by oil?
1) We could use the bromine water test to tell the difference between the alkane and the alkene
2) We can use a detergent to wash a cloth that is contaminated by oil.
What is an alkane?The term alkane has to do with a hydrocarbon that is composed of only a straight chain compound there are no multiple bonds in the alkane molecule and this is the difference between the alkane and the alkene. The alkene is composed of double bonds. The alkene compounds are able to decolorize bromine water while the alkanes can not.
If you have a contaminated cloth, you can be able to wash it by the use of a detergent because it is able to lift off the grease or oil by the use of the hydrophobic tail of the detergent.
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What is ethanoic or acetic anhydride?
Acetic anhydride is a colorless liquid with a characteristic pungent odor. It is used in the manufacture of plastics, drugs, dyes, perfumes, explosives, and aspirin.
This chemical compound has a colorless liquid appearance, also called anhydride, acetic, smells like vinegar.
you have a sample containing 4.5g of an unknown gas. Based on the volume, temperature, and pressure of the sample, there are 0.14 moles of gas present. What is the molar mass (g/mol) of the unknown gas? please explain step by step
The molar mass of the gas is obtained as 32.1 g/mol.
What is the molar mass?The molar mass has to do with the mass one mole of a substance. We know that according to the question, we can be able to obtain the number of moles of the compound from the ideal gas equation.
This is how we are able to get the number of moles of the gas as 0.14 moles. Now we need to use the information that we have to get the molar mass of the gass.
Number of moles = mass/ molar mass
Molar mass = mass/Number of moles
Molar mass = 4.5g/0.14 moles
= 32.1 g/mol
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How many moles are in a system that is 223 K, with an internal pressure
of 10 atm, in a fixed container that is 27 L
O 14.75 mol
O 1.21 mol
O 825 mol
5.42 mol
* 2 points
Answer:
A.) 14.75 mol
Explanation:
To find the amount of moles, you need to use the Ideal Gas Law equation:
PV = nRT
In this equation,
-----> P = pressure (atm)
-----> V = volume (L)
-----> n = number of moles
-----> R = Ideal Gas Constant (0.08206 L*atm/K*mol)
-----> T = temperature (K)
You can plug the given values and the constant into the equation and simplify to find "n".
P = 10 atm R = 0.08206 L*atm/K*mol
V = 27 L T = 223 K
n = ? moles
PV = nRT <----- Ideal Gas Law
(10 atm)(27 L) = n(0.08206 L*atm/K*mol)(223 K) <----- Insert variables
270 atm*L = n(18.299 L*atm/mol) <----- Mutliply
14.75 mol = n <----- Divide both sides by 18.299
A gas is heated from 213.0 K to 498.0
K and the volume is increased from
23.0 liters to 55.0 liters by moving a
large piston within a cylinder. If the
original pressure was 1.15 atm, what
would the final pressure be?
Answer:
0.5 7.0 there is so many results
Explanation:
its very simple
If 18.0 grams of water were actually produced, what is the percent yield of the reaction between 4 g of hydrogen gas and 1.5 mol of oxygen gas?
The percent yield of the water is 33.3%.
What is the percent yield?We know that the reaction that takes place between hydrogen and oxygen to give water is; [tex]2H_{2} (g) + O_{2} (g) ----- > 2H_{2}O(g)[/tex]. We now need to find the number of moles of hydrogen = 4 g/2 g/mol = 2 moles
Now;
If 2 moles of hydrogen reacts with 1 moles of oxygen
We can see that oxygen is the limiting reactant in this case.
1 mole of oxygen produces 2 moles of water
1.5 moles of oxygen produces 1.5 * 2/1
= 3 moles of water
Then the theoretical yield of water = 3 moles * 18 g/mol = 54 g
Percent yield = Actual yield / theoretical yield * 100/1
= 18/54 * 100/1
= 33.3%
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A 1.50 g of urea/cholesterol mixture was added to 25.0 mL of water to separate the two compounds. The solid sample collected after filtration is 0.52. What is the % of urea in the sample
Based on the mass of the sample, the percentage mass of urea in the urea/cholesterol mixture is 65.3%.
What is the percentage of urea in the urea/cholesterol mixture?The percentage mass of urea in the urea/cholesterol mixture is determined using the formula below:
Percentage of urea = (mass of urea in sample/mass of sample) * 100%The mass of urea in the sample is obtained using the formula below:
Mass of urea = mass of sample - mass of cholesterolDuring the separation procedure of the mixture, urea which is soluble in water goes into the solvent phase whereas cholesterol is obtained as a solid.
Hence, the 0.52 g solid sample collected is cholesterol.
mass of urea = 1.50 - 0.52
mass of urea = 0.98
Percentage urea = 0.98/1.5 * 100%
Percentage mass of urea = 65.3%
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A 90.0 g piece of metal, initially at 98.6°C, is placed into 120.0 g of water initially at 24.3°C. If the final temperature of the water is 34.0°C, what is the specific heat of the metal? (The specific heat of water is 4.184 J/g･°C).
Taking into account the definition of calorimetry, if the final temperature is 34 °C, the specific heat of the metal is 0.8381 J/gC.
CalorimetryCalorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.
When heat added or removed from a substance causes a temperature change in it without affecting its molecular structure, it is called sensible heat.
The expression that allows to calculate heat exchanges is:
Q = c× m× ΔT
where:
Q is the heat exchanged by a body of mass m.c is the specific heat substance.ΔT is the temperature variation.Specific heat of the metalIn this case, you know:
For metal:Mass of metal= 90 gInitial temperature of metal= 98.6 °CFinal temperature of metal= 34 ºCSpecific heat of metal= UnknownFor water:Mass of water = 120 gInitial temperature of water= 24.3 °CFinal temperature of water= 34 °CSpecific heat of water = 4.186 J/gCReplacing in the expression to calculate heat exchanges:
For metal: Qmetal= Specific heat of metal × 90 g× (34 C -98.6 C)For water: Qwater= 4.186 J/gC× 120 g× (34 C - 24.3 C)If two isolated bodies or systems exchange energy in the form of heat, the quantity received by one of them is equal to the quantity transferred by the other body. That is, the total energy exchanged remains constant, it is conserved.
Then, the heat that the gold gives up will be equal to the heat that the water receives. Therefore:
- Qmetal = + Qwater
- Specific heat of metal × 90 g× (34 C -98.6 C)= 4.186 J/gC× 120 g× (34 C - 24.3 C)
Solving:
- Specific heat of metal × 90 g× (34 C -98.6 C)= 4,872.504 J
Specific heat of metal × 5,814 gC= 4,872.504 J
Specific heat of metal = 4,872.504 J÷ 5,814 gC
Specific heat of metal = 0.8381 J/gC
Finally, the specific heat of the metal is 0.8381 J/gC.
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What is the molar solubility of barium phosphate (Ba3(PO4)2) at a temperature where the Ksp is (6.00x10^-37) (not at 25°C)?
The molar solubility of the barium salt is obtained as 1.29 * 10^-19 M.
What is the solubility?We know that the solubility has to do with the amount of the solute that is able to dissolve in a solvent at a particular temperature. As such, it is clear that the solubility depends on the temperature of the solution.
We know that the Ksp can be gotten from the expression of the Ksp as follows;
Ksp = [3x]^3 [2x]^2
Ksp = 9x^3 * 4x^2
Ksp = 36 * x^5
Ksp = 36x^5
x =[tex]\sqrt[5]{\frac{KSP}{36} }[/tex]
x = [tex]\sqrt[5]{6.00x10^-37} /36[/tex]
x = 1.29 * 10^-19 M
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I need help with this questuon
Following are reactant and product states and the balanced chemical equation for the specified chemical reaction: NaOH(aq)+HCl(aq) → NaCl(aq)+H2O(l)
How do you balance a chemical equation?
Step 1: In both reactants and products, count each kind of atom.
Check whether there is exactly the same amounts of each atom on either side of the arrow. Otherwise, the equation is unbalanced, and you must move on to step 2.
Step 2: To increase the amount of atoms or molecules in the substances, place coefficients in front of the symbols or formulas as necessary. Make use of the fewest coefficients you can. Chemical formulations should never have their subscripts changed. The substances involved in the reaction can be altered by changing subscripts. Only modify the coefficients.
Till the equation is balanced, go back and repeat steps 1 and 2.
Following are reactant and product states and the balanced chemical equation for the specified chemical reaction:
In the reaction between sodium hydroxide and hydrogen chloride, sodium chloride and water are produced.
Hence,
NaOH(aq)+HCl(aq) → NaCl(aq)+H2O(l)
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Help asap!!! What is rock cycle? How to label?
hope this helps you out I would have typed an answer using my notes but that was taking to long anyways have a nice day
In the SI system of units [International System of Units], the mole is one of seven base units. It is frequently used in chemical calculations. However, a mole of something is just a particular quantity of it. It is not a unit of measure in the way that meters, seconds, and kilograms are. Calculations performed with the number of moles of a substance could also be performed with the number of particles of a substance. Based on this information, do you think that the mole should be considered a base unit in the SI system? Explain why or why not.
The mole is an SI unit that links the microscopic and macroscopic world that is why yes, mole is the base of SI unit.
What is a mole?
A mole is a popular scientific measurement unit for large quantities of very small items like atoms, molecules, or other specified particles in chemistry. It can also be spelt mol.
A extremely big amount, 6.02214076 1023 units, are designated by the mole. As of May 20, 2019, the General Conference on Weights and Measures defined the mole as this quantity for the International System of Units (SI). The mole was traditionally defined as the number of atoms found by experimentation to be present in 12 grammes of carbon-12.
The quantity of units in a mole is also referred to as Avogadro's number or Avogadro's constant in honour of the Italian physicist Amedeo Avogadro. Equal volumes of gases under the same conditions, according to Avogadro.
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The substances sodium (Na), oxygen (O₂), and sodium oxide (Na2O) participate in this chemical reaction:
4Na + O2 → 2Na₂O.
Which statement best describes the reaction?
Sodium oxide is created by the chemical reaction statement best describes the reaction .
What is chemical reaction ?
Chemical reactions happen absolutely everywhere. While we sometimes associate chemical reactions with the sterile environment of test tubes and laboratories, nothing is farther from the truth. In fact, a vast number of transformations are creating a dizzying and almost incomprehensible series of new matter and energy changes in our world every second of every day.
In nature, chemical reactions are much more uncontrollable and sometimes much more complex than in the laboratory. Chemical reactions usually occur as needed. The fire raging in the forest, the slow rusting process of iron over the years in the presence of oxygen and water, or the delicate ripening of the fruit on the tree, the process of transforming various chemicals... ( The transformation of one group of substances (products) into another group of substances (products) is a so-called chemical reaction.
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How many molecules are in 72.0 moles of CO₂?
Taking into account the definition of Avogadro's Number, 4.33656×10²⁵ molecules are in 72 moles of CO₂.
Avogadro's NumberAvogadro's Number is called the number of particles that make up a substance (usually atoms or molecules). This particles can be found in the amount of one mole of said substance.
Its value is 6.023×10²³ particles per mole. Avogadro's number applies to any substance.
Amount of molecules on 72 moles of CO₂Then you can apply the following rule of three: if 1 mole of CO₂ contains 6.023×10²³ molecules, 72 moles of CO₂ contains how many molecules?
amount of molecules of CO₂= (6.023×10²³ molecules × 72 mole)÷ 1 mole
amount of molecules of CO₂= 4.33656×10²⁵ molecules
Finally, 4.33656×10²⁵ molecules are present in 72 moles of CO₂.
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A quantity of nitrogen gas is enclosed in a tightly stoppered 500 mL flask at room temperature (20.0 °C) and 0.836 atm pressure. The flask is then heated to 680 °C. If the flask can withstand pressures up to 3 atm, will it explode under this heating?
The vessel will not explode since the new gas pressure is less than 3 atm.
What will be the pressure when the temperature of a given volume of nitrogen gas is heated?The pressure when the temperature of a given volume of nitrogen gas is heated is calculated using the formula given below:
P₁/T₁ = P₂/T₂where;
P₁ = initial pressureT₁ = initial temperatureP₂= final pressureT₂ = final temperatureSolving for P₂
P₂ = P₁ * T₂ / T₁
P₂ = 0.836 * (680 + 273) / (20 + 273)
P₂ = 2.72 atm
The new pressure is less than 3 atm.
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You are holding a small helium balloon. Your friend says that the buoyant force from the atmosphere is greater on her car than your balloon. Is she correct? Explain your answer.
Yes , the buoyant force from the atmosphere is greater on her car than your balloon .
So, She is correct.
Since, the density of helium is less than air, the buoyant force exerted by air is less than the weight of the balloon filled with helium, causing the balloon to float in the air and rise.
What do you mean by buoyant force?
The term light power alludes to the vertical coordinated force that a liquid applies on an item that is to some degree or totally drenched in the liquid. The light power emerges from contrasts in hydrostatic strain - the tension applied by a static liquid.
What is the buoyant force on a helium balloon in air?
Helium has 0.0114 pounds per cubic foot. For a one cubic foot helium filled balloon , gravity pulls the down on the helium with a force of 0.0114 pounds while the air pushes up with a force equal to the weight of the air of the helium displaced, or 0.0807 pounds.
Hence, the buoyant force from the atmosphere is greater on the car than the balloon.
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what is the limiting agent in 3 C2H3O2H + Al(OH)3
To solve such this we must know the concept of chemical reaction and concept of limiting agent. Therefore, C[tex]_2[/tex]H[tex]_3[/tex]O[tex]_2[/tex]H is limiting agent in the given balanced equation.
What is chemical reaction?Chemical reaction is a process in which two or more than two molecules collide in right orientation and energy to form a new chemical compound. The mass of the overall reaction should be conserved. There are so many types of chemical reaction reaction like combination reaction, double displacement reaction.
The balanced reaction is
3 C[tex]_2[/tex]H[tex]_3[/tex]O[tex]_2[/tex]H + Al(OH)[tex]_3[/tex][tex]\rightarrow[/tex]
The limiting reagent depends on the mole ratio and not on the masses of the reactants present. 1 mole of Al(OH)[tex]_3[/tex] need 3 moles of 3 C[tex]_2[/tex]H[tex]_3[/tex]O[tex]_2[/tex]H. So, C[tex]_2[/tex]H[tex]_3[/tex]O[tex]_2[/tex]H is limiting reagent.
Therefore, C[tex]_2[/tex]H[tex]_3[/tex]O[tex]_2[/tex]H is limiting reagent.
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If you have 37.75 g of S, how many moles does it correspond to?
If we have 37.75 g of S , the number of moles is 1.17 mol.
Given that :
mass of Sulphur , S = 37.75 g
Molar mass of Sulphur , S = 32 g / mol
The number of moles of substances is equals to the ,mass of substance given to the molar mass of that substance.
number of moles = mass / molar mass
number of moles of sulphur = 37.75 g / 32 g / mol
number of moles of sulphur = 1.17 mol
Thus, If we have 37.75 g of S , the number of moles is 1.17 mol.
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if some filtrate splattered out of the beaker while it was heated how would this affect the measured results
Answer:
it will be all water and it needs to cool of
10^-2 M NH3 in water Kb=1.8*10^-5, conc. of all species=?
1.34 x 10^{-3} is the concentration of NH4 .
What is pH ?
pH, a quantitative measure of the acidity or basicity of aqueous or other liquid solutions. Widely used in chemistry, biology, and agriculture, this term translates the concentration value of hydrogen ions. This typically ranges from about 1 to 10-14 gram equivalents per liter. Converted to a number between 0 and 14. At neutral (neither acidic nor alkaline), the concentration of hydrogen ions is 10−7 gram equivalents per liter, which corresponds to a pH of 7. Solutions below pH 7 are considered acidic. Solutions with a pH greater than 7 are considered basic or alkaline.
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Which of the following alcohols is used in antifreeze?
ethylene glycol
glycerol
ethanol
isopropyl alcohol
Answer:
No entendí porfavor puedes explicarme
What volume of 0.180 M KOH is needed to react completely with 15.1 mL of 0.190 M H2SO4
The volume of 0.180 M KOH that would be needed to completely react with 15.1 mL of 0.190 M [tex]H_2SO_4[/tex] will be 31.88 mL
Stoichiometric problemThe equation of the reaction involving KOH and [tex]H_2SO_4[/tex] is as follows:
[tex]2KOH + H_2SO_4 --- > K_2SO_4 + 2H_2O[/tex]
The equation is already balanced and the mole ratio of KOH and [tex]H_2SO_4[/tex] is 2:1.
But 15.1 mL of 0.190 M [tex]H_2SO_4[/tex] is available.
Recall that:
mole = molarity x volume
Mole of 15.1 mL of 0.190 M [tex]H_2SO_4[/tex] = 0.190 x 15.1/1000
= 0.002869 mol
From the 2:1 mole ratio, the equivalent mol of KOH would then be:
0.002869 x 2 = 0.005738 mol
Since, mole = molarity x volume. Then, volume = mole/molarity
So, the volume of 0.005738 mol of 0.180 M KOH would be:
volume = 0.005738/0.180
= 0.03188 liters
Converting 0.03188 liters to mL:
0.03188 x 1000 = 31.88 mL
Thus, the volume of 0.180 M KOH needed to react completely with 15.1 mL of 0.190 M H2SO4 would be 31.88 mL.
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A propane tank when first filled reads 175. psi. After 1 month of use, the propane tank reads 81. psi.
Note: Reference the Conversion factors for non-SI units table for additional information.
Part 1 of 2
Convert the tank pressure when first filled to mmHg. Be sure your answer has the correct number of significant figures.
m
175. ps1=
mmHg
Answer:
After 1 month of use, the propane tank reads 81
Explanation:
a student investigated heat transfer using a bottle of water
The result of the Heat Transfer experiment is given as follows: "The molecule was increased in kinetic energy but in a random structure." (Option B)
What is Heat Transfer?Heat transfer is a thermal engineering subject that deals with the creation, consumption, conversion, and exchange of thermal energy across physical systems.
Heat transmission is categorized into several methods, including thermal conduction, thermal convection, thermal radiation, and energy transfer via phase shifts.
At 3 p.m., the water temperature is raised. The average kinetic energy of an item is related to its temperature. As a result, as temperature rises, so does average kinetic energy.
Kinetic energy is created by the random movement of molecules. Hence, the correct answer is "The molecule was increased in kinetic energy but in a random structure."
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Full Question:
A student investigated heat transfer using a bottle of water. The student placed the bottle in a room at 20.50C. The student measured the temperature of the water in the bottle at 7 a.m. and again at 3 p.m. The data from the investigation are shown in the table below.
[See attached image]
Question:How would you describe the average kinetic energy of the water molecules in the bottle at 7 a.m. to the average kinetic energy of the water molecules in the bottle at 3 p.m.
The molecules were increased in kinetic energy but in a uniform structure. The molecules were increased in kinetic energy but in a random structure. The molecules were decreased in kinetic energy but in a uniform structure. The molecules were decreased in kinetic energy but in a random structure.
How many molecules are in 30 g of CO2?
if a reaction that should theoretically yield 20 g of a product has a 45% yield, what is the actual yield of product
If if a reaction that should theoretically yield 20 g of a product has a 45% yield, The actual yield of product is 9g.
How to find the actual yield?Using this formula to find the actual yield of product
Actual yield of product = Actual yield × Theoretically yield
Where:
Actual yield = 45% or 0.45
Theoretically yield = 20g
Let plug in the formula
Actual yield = 0.45 × 20g
Actual yield= 9g
Therefore the actual yield is 9g.
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Taking into account definition of percent yield, the actual yield of the product is 9 g.
Percent yieldThe percent yield is the ratio of the actual return to the theoretical return expressed as a percentage.
The percent yield is calculated as the experimental yield divided by the theoretical yield multiplied by 100%:
percent yield= (actual yield÷ theoretical yield)× 100%
where:
The actual yield is the amount of product that is actually formed when the reaction is carried out.The theoretical yield is the amount of product acquired through the complete conversion of all reagents in the final product, that is, it is the maximum amount of product that could be formed from the given amounts of reagents.Actual yield of product in this caseIn this case, you know:
Percent yield: 45%Actual yield: ?Theoretical yield: 20 gReplacing in the definition of percent yield:
45%= (actual yield÷ 20 g)× 100%
45%÷100%= actual yield÷ 20 g
0.45= actual yield÷ 20 g
0.45×20 g= actual yield
9 g= actual yield
Finally, the actual yield is 9 g.
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true or false
Newton's first law of inertia says that an object at rest will stay at rest and an object in motion will stay in motion unless acted on by a force.
Newton's first law of inertia says that an object at rest will stay at rest and an object in motion will stay in motion unless acted on by a force; thus the statement is True
What is the law of inertia?The law of inertia is also known as Newton's first law of motion.
The law of inertia states that a body at rest or that is moving at constant or uniform motion along a straight line will remain in its state of rest or motion or uniform motion along a straight line unless acted upon by an external force.
The law of inertia explains why it s difficult to start an object moving or to stop a moving object.
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