State law of conservation of mass and prove the law for below given chemical reaction
Answers
The law of conservation of mass say that, in a chemical reaction, the mass of the reagents will always be equal to the mass of the products. This is shown in the reaction given below.
Mass of the reagent: 100 g.Mass of the products: 56 + 44 = 100 g.Answer:
The law of conservation of mass states that mass in an isolated system is neither created nor destroyed by chemical reactions or physical transformations. According to the law of conservation of mass, the mass of the products in a chemical reaction must equal the mass of the reactants.
Explanation:
During a chemical reaction, atoms are neither created nor destroyed. The atoms of the reactants are just rearranged to form products. Hence, there is no change in m
Related Questions
A hot metal plate at 150°C has been placed in air at room temperature. Which event would most likely take place over the next few minutes? Molecules in both the metal and the surrounding air will start moving at lower speeds. Molecules in both the metal and the surrounding air will start moving at higher speeds. The air molecules that are surrounding the metal will slow down, and the molecules in the metal will speed up. The air molecules that are surrounding the metal will speed up, and the molecules in the metal will slow down.
Answers
Answer:
The air molecules that are surrounding the metal will speed up, and the molecules in the metal will slow down.
Explanation:
As molecules heat they begin to move faster. The heat from the metal plate will make the molecules at room temperature move faster. And the room temperature makes the hot place cool, making the hot plate molecules slow down.
To visualize this, you can use this link
https://phet.colorado.edu/en/simulations/gas-properties
click the play button to activate the activity
Calculate the mole fraction of each component in a solution of 42 g CH3OH, 35 g of chloroform CHCl3, and 50 g C3H7OH
Answers
Considering the definition of mole fraction, the mole fraction of each component in the solution is:
CH₃OH: 0.54 CHCl₃: 0.118C₃H₇OH: 0.342Mole fractionThe molar fraction is a way of measuring the concentration that expresses the proportion in which a substance is found with respect to the total moles of the solution.
Mole fraction of each component
In this case, in first place you should know that the molar mass of each component is:
CH₃OH: 32 [tex]\frac{g}{mole}[/tex] CHCl₃: 121.35 [tex]\frac{g}{mole}[/tex]C₃H₇OH: 60 [tex]\frac{g}{mole}[/tex]Now, the number of moles of each compound can be calculated as:
CH₃OH: [tex]\frac{42 g}{32\frac{g}{mole}}[/tex]= 1.3125 molesCHCl₃: [tex]\frac{35 g}{121.35\frac{g}{mole}}[/tex]= 0.2884 molesC₃H₇OH: [tex]\frac{50 g}{60\frac{g}{mole}}[/tex]= 0.8333 molesSo, the total moles of the solution can be calculated as:
Total moles = 1.3125 moles + 0.2884 moles + 0.8333 moles
Total moles = 2.4342 moles
Finally, the more fraction of each component can be calculated as follow:
CH₃OH: [tex]\frac{1.3125 moles}{2.4342 moles}[/tex]= 0.54 CHCl₃: [tex]\frac{0.2884 moles}{2.4342 moles}[/tex]= 0.118C₃H₇OH: [tex]\frac{0.8333 moles}{2.4342 moles}[/tex]= 0.342In summary, the mole fraction of each component in the solution is:
CH₃OH: 0.54 CHCl₃: 0.118C₃H₇OH: 0.342Learn more about mole fraction:
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another one. i’m still stuck on these problems pls help lol
Answers
Answer:
Not so sure. Hope it helps...
Which state of matter resists compression the most?
A. Gas
B. Liquid
C. All of these
D. Solid
Answers
Answer:
Explanation:
Answer: D. Solid
please help. i’m strugglingggg
Rewrite this measurement with a simpler unit, if possible.
Answers
Answer:
m/s
Explanation:
One 'm' and one 's' in the numerator and the denominator 'cancel out' and you are left with m / s
Please help me thank you!
Answers
The difference in the electronegativity of the Y-P bond is 0.97.
What is electronegativity?The term electronegativity has to do with the difference between the ability of two atoms in a bond to attract the shared electrons of the bond towards themselves.
The electronegativity value of Y is 1.22 while the electronegativity value of P is 2.19.
Hence;
ΔEN = 2.19 - 1.22
ΔEN = 0.97
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You wish to make a 0.375 M hydroiodic acid solution from a stock solution of 6.00 M hydroiodic acid. How much concentrated acid must you add to obtain a total volume of 175 mL of the dilute solution
Answers
We need to add 2.09 mL of concentrated acid to obtain 75 mL of 0.335 M HBr solution.
You are performing a dilution of HBr going from a concentration of 12M to 0.335M, and you want to end up with a final volume of 75 ml of the dilute solution.
Consider the dilution formula: M1V1 = M2V2.
The basis behind this formula is that the number of moles of the acid before and after the dilution must remain constant.
M1 = the molarity of the stock solution,
M2 = the molarity of the diluted solution,
V2 = the final volume of the diluted solution.
In this case, we need to determine V1, which is the volume of the stock solution used to prepare the diluted sample. With this knowledge, we can plug our numbers into the equation and we obtain the following:
(12 mol/L)*V1 = (0.335mol/L)*(0.075L).
Keeping in mind that molarity is the moles of a substance in one liter of solution, we will use mol/L instead of M. By doing this, we are reminded that in order to use this equation, we must convert 75 mL into units of liters.
After rearranging the equation and solving for V1, we find that V1 = 0.00209L.
Finally, we must convert back from liters to mL by multiplying the final answer by 1000.
This way we end up with V1 = 2.09 mL.
This means that we need to add 2.09 mL of concentrated acid to obtain 75 mL of 0.335 M HBr solution.
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Acetic acid (which is commonly known as vinegar) has a ph of 4.8. what is the hydronium ion (h3o ) concentration of the acetic acid?
Answers
Concentration of Hydronium ions in the Acetic acid is [tex]1.58\times10^{-5}[/tex]
Calculation of concentration of acid:
pH of a solution is defined by the concentration of Hydronium ions in the solution.
Also, pH is defined as the negative of logarithm of [tex]log[H^+][/tex]
[tex]pH= -log[H^+][/tex]
pH of Acetic acid= 4.8
Therefore,
[tex]4.8= -log[H^+][/tex]
Taking antilog, we get
[tex][H^+] = 0.0000158M= 1.58\times10^{-5}M[/tex]
The Hydronium concentration of the acetic acid is [tex]1.58\times 10^{-5}[/tex]M.
As Acetic acid is a weak acid which means that ionization of acid is not complete, ie. 100%
That is why the concentration of Hydronium ions are less in the solution.
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What is Chemical Bonding?
Explain please.
Answers
Answer:
Chemical bonds are how atoms, and even molecules join together.
Explanation:
There are two main types of primary chemical bonds. While secondary links relate to molecules, primary ties are atom to atom. This answer explains basic primary bonds only.
One must comprehend what a valence shell is before I proceed. The outer electron orbital of an atom is known as the valence shell. Most of the time (except from hydrogen), atoms desire to have 8 electrons in their valence shell, thus they form bonds with other atoms to accomplish this.
All bonds result in a new chemically different molecule. Now, the two types are:
Covalent: When two atoms combine their electrons to fill their valence shells. The atoms are joined together by this "sharing."Ionic: When one atom transfers an electron to another atom in order to fulfill the valence electron requirement. Because electrons have a negative charge, the atom that produced them gains a positive charge as a result of losing its negative charge. The atom that received the electron therefore acquires a negative charge. Because opposing charges attract, it seems sense that the charged atoms bind as a result.5. Ba(NO2)2 + H2SO4 = BaSO4 +2HNO2 what is the chemical reaction?
1. Single Displacement
2. Double Displacement
3. Synthesis
4. Decompostion
Answers
Answer:
2
Explanation:
PLEASE HELP!! What is the pH of a solution with a [H3O+] concentration of 3.4 x 10-11 M? Is the solution acidic, basic, or neutral?
Answers
[tex]\\ \tt\leadsto pH=-log[H^+][/texM
[tex]\\ \tt\leadsto pH=-log[3.4\times 10^{-11}][/tex]
[tex]\\ \tt\leadsto pH=-log3.4-log10^{-11}[/tex]
[tex]\\ \tt\leadsto pH=-0.53+11[/tex]
[tex]\\ \tt\leadsto pH=10.47[/tex]
Basic
Considering the definition of pH, the pH of the solution is 10.47 and since it is higher than 7, it is a basic substance.
Definition of pHpH is the Hydrogen Potential. It is a measure of acidity or alkalinity that indicates the amount of hydrogen ions present in a solution or substance.
Mathematically, pH is calculated as the negative base 10 logarithm of the activity of hydrogen ions:
pH= - log [H⁺]= - log [H₃O⁺]
Numerical scale of pHThe numerical scale that measures the pH of substances includes the numbers from 0 to 14. The pH value 7 corresponds to neutral substances. Acidic substances are those with a pH lower than 7, while basic substances have a pH higher than 7.
pH in this caseIn this case, you know [H₃O⁺]= 3.4×10⁻¹¹ M.
Replacing in the definition of pH:
pH= -log (3.4×10⁻¹¹ M)
Solving:
pH= 10.47
Finally, the pH of the solution is 10.47 and since it is higher than 7, it is a basic substance.
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Sixty-three grams of copper reacted with 32 grams of sulfur. this chemical reaction produced the compound copper sulfide. what was the mass of this compound?
Answers
The mass of, [tex]Cu_2S[/tex], compound formed is 77.9g
62 grams of copper reacted with 32grams of sulfur to form copper sulfide.
[tex]Cu + S_2 \rightarrow CuS_2[/tex]
stoichiometry of Cu to S is 2:1
We need to find the limiting reactant
Molar mass of copper = 63.5 g/mol
Molar mass of Sulfur = 32 g/mol
Number of moles of Copper = [tex]\dfrac{mass} {molar mass } = 0.99mole[/tex]
Number of moles of Sulfur = [tex]\dfrac{mass} {molar mass} = \dfrac{32g} {32g/mol} = 1 mole[/tex]
Since copper have lesser number of moles, therefore the limiting reagent is copper so the amount of product formed depends on amount of Cu present
stoichiometry of Copper to [tex]Cu_2S[/tex] is 2:1
0.99 mol of Copper forms = [tex]\dfrac{0.99} {2}[/tex] = 0.49 mol of [tex]Cu_2S[/tex]
Mass of [tex]Cu_2S[/tex] produced = Number of moles [tex]\times[/tex] Molar mass
Mass of [tex]Cu_2S[/tex] produced = 0.49 mol [tex]\times[/tex] 159 g/mol = 77.9g
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Which bond is the most polar?
Group of answer choices
a)between C and O
b)between Br and Br
c)between C and S
d)between C and Is
Answers
Answer:
a between c and o
Explanation:
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What volume (in liters, at 703 k and 2.04 atm) of chlorine gas is required to react with 3.39 g of p?
Answers
The volume of chlorine required is 7.71 L.
The reaction between phosphorus and chlorine is:
2P + 5Cl₂→ 5PCl₅
Therefore, 2 moles of P requires 5 moles of chlorine to react with it.
Given mass of P =3.39 g
Molar mass of P=30.97 g/mol
No. of moles of P = given mass/ molar mass = 3.39 / 30.97 = 0.109 moles
2 moles of P requires 5 moles of chlorine
0.109 moles of P will require 0.109 x 5/2 = 0.2725 moles of chlorine
According to ideal gas equation
PV=nRT
2.04 x V = 0.2725 x 0.0821 x 703
V = 0.2725 x 0.0821 x 703 / 2.04
V = 7.71L
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A chemist measured the amount of magnesium oxide produced during an experiment. She finds that 999. g of magnesium oxide is produced. Calculate the
number of moles of magnesium oxide produced.
Round your answer to 3 significant digits.
Answers
Answer:
24.8 moles MgO
Explanation:
To find the number of moles produced, you need to multiply the mass (999 grams) by the molar mass of magnesium oxide. The molar mass is made up of the atomic weights of each element times their quantities in the molecule.
Molar Mass (MgO): 24.305 g/mol + 15.998 g/mol
Molar Mass (MgO): 40.303 g/mol
999 g MgO 1 mole
-------------------- x ---------------------- = 24.8 moles MgO
40.303 g
Calculate the pH of 720. mL of a 0.425-M solution of hydrocyanic acid before and after the addition of 0.249 mol of sodium cyanide.
Answers
The pH of hydrocyanic acid before and after the addition of sodium cyanide is 0.371 and 9.121
Calculation of pH of 720:
Given: Concentration of hydrocyanic acid (HCN) = 0.425 M
To find: pH
Reaction:
[tex]HCN \,\,\,\,\,\rightarrow \,\,\,\,\,\,H^+ + CN^-[/tex]
0.425M 0.425M
[tex]pH= -[logH^+]\\pH=-[log\,0.425]\\pH= 0.371[/tex]
pH after adding 0.249 mol of sodium cyanide (NaCN)
Pka of HCN= 9.21
Concentration of sodium cyanide = [tex]\frac{0.249}{0.720}\,M[/tex]
Concentration of NaCN= 0.346 M
According to Henderson–Hasselbalch equation:
[tex]pH= p_k_a + log\frac{salt}{acid}[/tex]
Putting the values in the above equation,
[tex]pH= 9.21 + log\frac{0.346}{0.425} \\\\pH= 9.21 - 0.089\\pH= 9.121[/tex]
Note: Pka value of HCN is assumed as 9.21
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How do you define gravity, and how does it work?
Answers
Answer:
I'm not a genius but it's an invisible force that pulld object towards eachother, Earth's gravity is what keeps you on the ground and what makes things fall, Anything with mass also has gravity, objects with more mass means they have more gravity
An intravenous solution is noted as having a concentration of glucose equal to 0.312 M. What volume of solution (in mL) is needed to deliver 0.078 moles of glucose to the patient?
Answers
From the calculations, the volume of the solution is 0.25 L.
What is concentration?The term concentration refers to the amount of solute in a solution. It is obtained as the ratio of the number of moles and the volume.
Given that;
number of moles = 0.078 moles
concentration = 0.312 M
n = CV
V = n/C
V = 0.078 moles / 0.312 M
V = 0.25 L
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The element oxygen has a molar mass of 15.999 grams, thus one mole of oxygen is equal to _____ g/mol.
Answers
Answer: 15.999 grams.
Explanation: The molar mass of an element is the mass of one mole of that element. You can also solve this with a little bit of math.
[tex]15.999gO*\frac{1molO}{15.999gO} =1molO[/tex]
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The reaction catalyzed by succinyl-CoA synthetase temporarily transfers a phosphoryl group to a His residue in the enzyme's active site. What stabilizes the phosphoenzyme intermediate
Answers
Answer:
In the dephosphorylated structure, the enzyme is stabilized via coordination of a phosphate ion by the active-site histidine residue and the two ...
A pressure cooker is a covered pot sealed everywhere except for a small circular opening at the top. A small weight placed over this opening determines the pressure at which steam is released from the pot. Suppose that the radius of the opening is 0.450 mm and the weight is 0.848 N. Find the maximum pressure inside the pot.
Answers
Answer:
1.02 N/mm2
Explanation:
We can see that the pressure is applied on the small weight that covers the opening.
The area of the circular opening is π(0.512 mm)
= 0.824 mm2
Pressure = Pressure = Force / Area
= (0.847 N) / (0.824 mm2)
= 1.02 N/mm2
When a substance is dissolved in water, the properties of the solution will be different from those of the water?
Answers
Answer:
yes
Explanation:
boiling point, freezing point, ph , density are just a few that would change
To which group does copper belong?
a. Metalloid
b. Alkaline earth metal
c. Alkali metal
d. Transition metal
Answers
Answer:
d. Transition metal
Explanation:
Copper is in transition metal block in periodic table.
Answer:
Copper belongs to the d. transition metal group.
Explanation:
Copper's d-shell is partially filled making it a transition metal. Copper is one of the few transition metals that has a set charge. Copper's charge is +2.
When referring to the periodic table, copper is in the middle section of the table which is the transition metals. It is between the metals and the non-metals.
A sample of ideal gas at room temperature occupies a volume of 27.0 L at a pressure of 852 torr . If the pressure changes to 4260 torr , with no change in the temperature or moles of gas, what is the new volume, V2
Answers
The new volume V₂ is 5.4L
The new volume is calculated using Boyle's law formula
That is P₁V₁=P₂V₂
where,
p₁ = 852 torr
V₁ = 27.0
P₂ = 4260 torr
V₂=?
Make V₂ the subject of the formula by diving into both sides of the equation by P₂
V₂ = P₁V₁/P₂
⇒ 852 *
V₂ is, therefore, = 5.4 L
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Sodium (Na) is a ____
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Which is the best reason for choosing the beaker for heating the solution? the beaker is the only container that can withstand high temperatures. the beaker's wide mouth allows the thermometer to rest against the side. the beaker will not tip over when placed on the hot plate. the beaker is unbreakable.
Answers
The selection of the beaker for heating the solution:
The best reason for choosing the beaker for heating the solution is "The beaker will not tip over when placed on the hot plate".
What is a Beaker?:
A glass container with a flat bottom and a tiny pouring mouth is known as a beaker. It is employed in the chemistry lab to stir, heat, and mix liquids.Beakers can be heated on a hot plate directly. Because of their flat bottoms, these containers will uniformly distribute heat when the mixture is shaken. It is best to heat indirectly any other container without a flat surface.Borosilicate glass, which is frequently used to make glass beakers, has boron trioxide, which gives it the ability to withstand sharp temperature changes. It can endure temperatures of up to 400°C.
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If 10L of O2 at 273K and 1 atm is compressed to a pressure of 7 atm at 250K, what is the new volume? *Please pay attention that it says "7 atm" and not "7L"!!!*
Answers
The new volume of the gas, given the data is 1.3 L
Data obtained from the questiom Initial volume (V₁) = 10 LInitial pressure (P₁) = 1 atmInitial temperature (T₁) = 273 KNew pressure (P₂) = 7 atmNew temperature (T₂) = 250 KNew Volume (V₂) =? How to determine the new volumeThe new volume of the gas can be obtained by using the combined gas equation as illustrated below:
P₁V₁ / T₁ = P₂V₂ / T₂
(1 × 10) / 273 = (7 × V₂) / 250
Cross multiply
273 × 7 × V₂ = 10 × 250
Divide both sides by 273 × 7
V₂ = (10 × 250) / (273 × 7)
V₂ = 1.3 L
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Arroyo Books sells new and used books, some long (with many pages) and some short (with fewer pages). Decide
whether each property of their books listed in the table below is extensive or intensive, if you can. If there's not
enough information to decide, check the can't decide box.
Answers
The percentage of words in the book which have more than two syllabus: Can't decide. The number of pages in the first chapter is extensive property. The shipping cost of the book (which depend on weight) is extensive property.
What is Intensive Property ?The property which do not depend on the quantity or amount of matter is called Intensive Property. The intensive properties are pressure, temperature, density, concentration, taste, color etc.
What is Extensive Property ?The property which depend upon the amount of matter in a sample is called Extensive property. The extensive properties are mass, volume, heat capacity, weight, length, shape etc.
The percentage of words in the book which have more than two syllabus in this case we cannot decide whether it is extensive property or intensive property.
The number of pages in the first chapter is extensive property because the pages have some mass and mass is extensive property.
The shipping cost of the book (which depend on weight) is extensive property as weight is an extensive property which depend upon the amount of matter.
Thus from the above conclusion we can say that The percentage of words in the book which have more than two syllabus: Can't decide. The number of pages in the first chapter is extensive property. The shipping cost of the book (which depend on weight) is extensive property.
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A 16.0 L gas cylinder has been filled with 8.00 moles of gas. You measure the pressure to be 3.70 atm . What is the temperature inside the tank? Express your answer to three significant figures and include the appropriate units.
Answers
The temperature inside the tank is 9.013K
Using the ideal gas equation
T=PV / nR
Given,
n = 0.821
R = 8
P = 3.70
V = 16
T = 16 * 3.70 / 0.821 * 8
T = 59.2 / 6.568
T = 9.013
The temperature inside the tank is 9.013K
Many gases such as nitrogen, oxygen, hydrogen, noble gases, some heavier gases like carbon dioxide, and mixtures such as air, can be treated as ideal gases within reasonable tolerances over a considerable parameter range around standard temperature and pressure.
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Which of the following diagrams
represents a compound? Each color
represents a different element. Circles
that are directly touching represent
elements that are chemically combined.