The most common way to monitor the rate of reaction is by observing the increase in the absorbance of the solution.
What is the rate of reaction?The rate of reaction is the rate at which reactants are converted into products or the rate at which the reactants disappear.
Given that the reaction is a colorimetric reaction, the most common way to monitor the rate of reaction is by observing the increase in the absorbance of the solution.
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229.2 g of tin was heated from 46.3 to 115.7°C. How much energy was used to heat tin? (Specific heat capacity of Sn is 0.222 J/g x °C)
3531.23 J is the energy used to heat tin when 229.2 g of tin was heated from 46.3 to 115.7°C.
What is specific heat capacity?The specific heat capacity is defined as the quantity of heat (J) absorbed per unit mass (kg) of the material when its temperature increases by 1 K (or 1 °C), and its units are J/(kg K) or J/(kg °C).
Q=mcΔT
Give data:
m=229.2 g
c=0.222 J/g x °C
ΔT=115.7°C - 46.3°C
ΔT= 69.4 °C
Putting value in the equation:
Q=mcΔT
Q=229.2 g x 0.222 J/g°C x 69.4 °C
Q= 3531.23 J
Hence, 3531.23 J is the energy used to heat tin.
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Aluminum oxide reacts with lithium metal. What is the coefficient for lithium when the equation is balanced?
Answer:
The Coefficient is 1
Explanation:
Calculate the bond length (in picometers) of a chemical bond between bromine and sulfur.
Bromine—atomic radius: 119 pm; covalent radius: 114 pm; ionic radius: 182 pm.
Sulfur—atomic radius: 109 pm; covalent radius: 102 pm; ionic radius: 184 pm.
The bond length of a chemical bond between bromine and sulfur is 216 picometers.
Explanation:Bromine and sulfur reacts with each other to form Sulfur dibromide.Sulfur dibromide is a covalent compound which means that a chemical bond exist between them is covalent bond.So, for finding a bond length of a covalently bonded compound we need to add the covalent radiuses of the two atoms.Given,
Covalent radius of bromine is 114 pm;
and covalent radius of sulfur is102 pm.
∴ Bond length of the sulfur dibromide= Covalent radius of bromine + covalent radius of sulfur
∴ Bond length = 114 + 102
∴ Bond length = 216 pm.
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Select the correct answer.
Which substance in this redox reaction is the oxidizing agent?
Cu + 2AgNO3 → 2Ag + Cu(NO3)2
A.
N
B.
AgNO3
C.
Cu
D.
NO3−
E.
Cu(NO3)2
Reset Next
Post Test: Chemical Reactions
© 2022 Edmentum. All rights reserved.
Answer:
CU
Explanation:
Cu is the correct answer if I'm correct
Please help me solve this questionn as fast as possible oofff
Answer:
sorry I don't know it I'm only 7 th grade
Calculate the molecular mass of Al2(SO4)3(Molecular mass of Al=27, S=32, O=16) Pls fast
Al₂(SO₄)₃
= 2.Al+3.S+12.O
= 2.27 + 3.32+12.16
= 54+96+192
=342 g/mol
Which type of molecule is made from amino acids?
Answer:
protein molecule
Explanation:
Answer: Protein
Explanation:
Amino acids from protein molecules.
(100 POINTS) WILL MARK BRAINLIEST
Which of the following explains how one of the postulates in John Dalton's atomic theory was later subjected to change?
Various scientists found that all atoms of a particular element are identical.
Some scientists found that atoms combine in simple whole number ratios to form compounds.
Various scientists found that atoms consist of subatomic particles with varying mass and charge.
Some scientists found that bonds between atoms are broken, rearranged, or reformed during reactions.
One of the postulates in John Dalton's atomic theory was later subjected to change was that Various scientists found that atoms consist of subatomic particles with varying mass and charge. option C is correct.
What are subatomic particles?
An atom is consist of three sub atomic particles called proton, neutrons and electrons also known as the fundamental nit of an atom.
Atom consist of an nucleus into which proton and neutrons are present and protons are positively charged whereas neutrons are neutral and electrons revolve around the nucleus in the fixed paths called shells and negatively charged.
Therefore, the postulates in John Dalton's atomic theory was later subjected to change was that Various scientists found that atoms consist of subatomic particles with varying mass and charge. option C is correct.
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Answer:
D. some scientists found that bonds between atoms are broken rearranged or reformed during reactions. According to Dalton's other theories, this is the only one that differentiates from his original theories :)
Explanation:
What is the mass of a 7.426-mole sample of sodium hydroxide (NaOH molar mass = 40.0 g/mol)?
Select one:
5.360 g
40.00 g
179.1g
297.0 g
[tex](40.0)(7.426)=\boxed{297.0 \text{ g (to 4 sf)}}[/tex]
What is the name of CH3CH2CHMgBr(CH3)?
Answer:
Ethyl magnesium Bromide
The speed of light through space is
The speed of light through space is 300 million m/s .
What is the limit of the speed ?There was a time when everybody thought that there is no limit for the speed at which an object can travel , but Einstein gave the limit which is the speed of light.
The speed of the light in vacuum travels at a speed of 300 million m/s .
Therefore The speed of light through space is 300 million m/s .
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What is the molar concentration of
a solution that contains
5.0 mol HCl in a total volume
of 10.0 L?
Answer:
0.5 M
Explanation:
Molar concentration : M = n/v
n = moles of solute
v = liters of solution
Hence, 5.0 / 10.0 = 0.5 M
what could cause an error DNA in replication
NOTICE: There are attachments attached to this answer that is mentioned in each paragraph!
We frequently see DNA replication as a well-organized, methodical process, much like a production line. It's not. For the DNA polymerase to read it, the DNA must not lie in a straight line and must be in motion, not static. It is curled and twisted. First, realize that this is a molecular issue. Bacteria lack neurons, cannot "think," and cannot make decisions. Everything is a chemical reaction, and chemical reactions frequently depend on one concentration's osmotic pressure being higher than another, both inside the cell and outside. Even at that level, there is a lot of "nothing," albeit nothing is empty. For a better understanding of the environment, picture a cell as a large room filled with balls of all sizes. Each ball has a unique form and isn't spherical; some balls fit together flawlessly while others don't. This is the easiest way to conceptualize the universe of molecular chemistry. There is never "nothing" other than in space when you push your way through layers upon layers of free oxygen, free nitrogen, helium, carbon dioxide, hydrogen dioxide, argon, methane, etc. when you walk through what we term "air."
Replication mistakes happen. Sometimes DNA polymerase enzymes add the incorrect nucleotide, too many, or too few nucleotides to a sequence. Or the DNA polymerase gets looped on the same strand, adding a few codons in a repetition before the strand slips away and it continues, or there is a tangle of crossing DNA and it jumps to the incorrect thread and back (or never), etc. In order to ensure that the bases added to a developing strand are appropriately matched with their complements, DNA polymerase enzymes are quite picky about the nucleotides they choose to use. However, these enzymes do make errors. Specifically, at a rate of around 1 per 100,000 nucleotides. Doesn't sound like much, but since each diploid cell has 6 billion base pairs, there are around 120,000 errors every cell division.
Ribosomal errors during transcription can even change the synthesis of the DNA polymerase proteins, leading to the creation of a mechanism that is already faulty. Since not all ribosomes are created equally, ribosome quality is important. Bacterial mutation rates are greater because bacterial ribosomes are less accurate and produce a lot more errors than human ribosomes. That is a benefit for simple, quickly reproducing life, which is also very vulnerable to the stresses of the molecular chemical environment. Unlike most more complex forms of life, which also have DNA repair mechanisms incorporated into the DNA polymerase, humans have these mechanisms. Some of these processes can often correct mistakes as soon as they are produced, while others can do so over time.
Regarding the pairing of C and T, etc. There are a number of balls in that room that, at first glance, appear to be identical, but if you compare two closely, you could find that one bump is larger or is located incorrectly even if it appears to be same. Proton shift is one such. Here are two instances using the purine guanine (G) and the pyrimidine thymine (T) (G). Please excuse my handwriting; I learned to type at a very young age. Shifted on the right, normal on the left. NA polymerase (as do most more complex forms of life) frequently correct mistakes as soon as they are made and others that correct mistakes later.
(ATTATCHMENT #1)
Which energy source from a reservoir would provide affordable, abundant electricity for a factory? solar panels wind turbines gas generators a hydroelectric plant
The energy source from a reservoir would provide affordable, abundant electricity for a factory is a hydroelectric power plant; option D.
What is energy?Energy is the ability to do work.
Energy generating plants may either use wind, water or solar energy to produce electrical energy.
The most abundant source of energy from a reservoir is hydroelectric power plant.
Therefore, the energy source from a reservoir would provide affordable, abundant electricity for a factory is a hydroelectric power plant.
In conclusion, hydroelectric power plants are reservoirs of abundant energy supply.
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A 208.1 mL sample of gas exerts 574.6 mm Hg pressure at 44.4 ºC. What pressure does it exert at 68.1 ºC if the volume expands to 401.5 mL?
a. 320
b. 457
c. 190
d. 917
Answer:
a. P = 320 mmHg
Explanation:
For this problem, the pressure, volume, and temperature are changing, so we'll need to combine Boyle's Law and Charles' Law:
[tex]\dfrac{P_1V_1}{T_1}=\dfrac{P_2V_2}{T_2}[/tex]
For this equation, the temperatures must be measured in Kelvin. The rest of units in the equation only need to match between beginning and end conditions.
Recall that to convert from Celsius to Kelvin, add 273, or use the equation [tex]T_C+273=T_K[/tex].
So [tex]T_1=(44.4+273)[K]=317.4[K][/tex] and [tex]T_2=(68.1+273)[K]=341.1[K][/tex]
Substituting known values, we can solve for the unknown:
[tex]\dfrac{P_1V_1}{T_1}=\dfrac{P_2V_2}{T_2}[/tex]
[tex]\dfrac{(574.6[mmHg])(208.1[mL])}{(317.4[K])}=\dfrac{P_2(401.5[mL])}{(341.1[K])}[/tex]
[tex]\dfrac{(574.6[mmHg])(208.1[mL]\!\!\!\!\!\!\!\!\!\!{--} )}{317.4[K]\!\!\!\!\!\!{-}}*\dfrac{341.1[K] \!\!\!\!\!\!{-}}{401.5[mL] \!\!\!\!\!\!\!\!\!\!\!{--} }=\dfrac{P_2(401.5[mL] \!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!{-----})}{341.1[K] \!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!{----}}*\dfrac{341.1[K] \!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!{----}}{401.5[mL] \!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!{-----} }[/tex]
[tex]320.056719296[mmHg]=P_2[/tex]
Accounting for significant figures, [tex]P_2=320.1[mmHg][/tex].
The closest answer provided is 320, so "a".
How many calories are absorbed
when water absorbs 6.55 kJ of
energy?
[?] cal
The number of calories which are absorbed when water absorbs 6.55 KJ of energy is 1565.49 calories
How do I determine the number of calories absorbed?To know the number of calories which are absorbed when water absorbs 6.55 KJ of energy, we shall begin by converting 6.55 KJ to joules (J). Details below:
Energy (in KJ) = 6.55 KJEnergy (in J) =?1 KJ = 1000 J
Therefore,
6.55 KJ = (6.55 KJ × 1000 J) / 1 KJ
6.55 KJ = 6550 J
Finally, we shall convert 6550 J to calories. This is illustrated below:
Energy (in J) = 6550 JEnergy (in calories) =?4.184 J = 1 calorie
Therefore,
6550 J = (6550 J × 1 calorie) / 4.184 J
6550 J = 1565.49 calories
Thus, from the above calculations, we can conclude that the number of calories absorbed is 1565.49 calories
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A student placed equal-sized potato cubes in two different beakers containing either distilled (pure) water or a concentrated sugar solution. The experiment is shown in Figure 2.
Explain
what would happen to the mass of the potato cube after being placed in distilled (pure) water
Please help me
When the potato is put into the distilled water, it will absorb the water. The water is trying to dilute the salt inside the potato.
What is the meaning of concentrated?
The concentration of a solution is a measure of the amount of solute that has been dissolved in a given amount of solvent or solution.
When the potato is put into the distilled water, it will absorb the water. The water is trying to dilute the salt inside the potato.
Since potatoes already contain sugar, less water will diffuse out of the potato placed in sugar water. The slice placed in water will be rigid since it will absorb water.
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A solute that has been dissolved in a solvent ________.
Answer:
a solution: for example when sugar is dissolved in water it becomes a sugar solution
The thermite reaction reacts iron (III) oxide, Fe2O3, with aluminium powder,Al, the form aluminium oxide, Al2O3 and iron, Fe.
A. a student reacted 16.0g of iron with 8.1g of aluminium powder. which of the two reactants is the limiting reagent? Show your working.
B. Calculate the maximum mass of iron of iron that could be formed using these quantities of reactants.
Answer:
This answer assumes that the strated "16.0g of iron" was meant to be 16.0 grams of iron(III) oxide.
Explanation:
To start, the thermite equation must be balanced.
I find:
1Fe2O3 + 2Al = 1Al2O3 + 2Fe
This tells us we need 2 moles of Al for every 1 mole of Fe2O3.
Now calculate the moles of each reactant:
Moles Fe2O3: 16.0 g/159.7 g/mole = 0.100 moles Fe2O3
Moles Al: 8.1 /26.98 g/mole = 0.300 moles Al
The balanced equation says that in order to react all of the Fe2O3 we'd need twice that amount (in moles) of the Al. (0.100 moles Fe2O3)*(2) = 0.200 moles Al.
Which of the two reactants is the limiting reagent?
We have more than enough moles of Al to react with 0.10 moles of Fe2O3. (We have 0.300 moles Al and all we need is 0.200 moles to react with the 0.10 moles of Fe2O3. Fe2O3 is the limiting reagent.
Calculate the maximum mass of iron of iron that could be formed using these quantities of reactants.
The balanced equation tells us that we will obtain 2 moles of Fe for every 1 mole of Fe2O3 consumed. Since Fe2O3 is the limiting reagent, we will assume that it completely reacts. That means 0.1 moles of Fe2O3 is reacted. Since we expect twice that many moles of Fe, we should obtain 0.200 moles of Fe. At 55.85 g/mole, we should obtain:
(0.200 moles Fe)*(55.85 g Fe/mole Fe) = 11.2 grams Fe
Using the balanced chemical equation, determine the
number of moles of aluminum required to react with 7.53
mol of chlorine.
2Al(s) + 3Cl2(g) -> 2AlCl3(s)
Answer:
5.02 mol
Explanation:
n(Al) : n(Cl)
2 : 3
x : 7.53
3x = 15.06
n(Al) = 5.02mol
How many hydrogen atoms are present in 2-methyl-2-butene?
There are three kinds of Hydrogen in 2-methyl-2-butene
The correct question is
How many kinds of hydrogen atoms are present in 2-methyl-2-butene
What is an atom ?Atom was discovered by Dalton's Atomic theory , he predicted that each element consist of large number of a very small thing known as atom.
In the structure of 2-methyl-2-butene there are 3 types oh Hydrogen
1. Attached to the Carbon atom connecting the methyl ion to the butene
2. Connected to the last Carbon atom
3. Connected to the Carbon bond having double bond.
Therefore there are three kinds of Hydrogen in 2-methyl-2-butene.
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Solve the given division and express the answer in terms of scientific notation. 4.8
x 104 by 1.6 × 10³ =
WILL GIVE BRAINLIEST
The table shows the number of reactants and products present during two separate chemical reaction
Which of the following statements correctly identifies the decomposition reaction and describes a substance involved?
Chemical reaction A, because the reactant is a compound
Chemical reaction B, because the product is a compound
Chemical reaction A, because the reactant is an element
Chemical reaction B, because the product is an element
Answer:
Chemical reaction A, because the reactant is a compound
Explanation:
In a decomposition reaction, a compound is broken down into its components, so the number of products is greater than the number of reactants
Chemical reaction A, because the reactant is a compound is a statements correctly identifies the decomposition reaction and describes a substance involved.
What is chemical reaction?When atoms establish or break chemical bonds, chemical processes take place. Reactants are the substances that begin a chemical reaction, while products are the compounds that are created as a result of the reaction.
Although a chemical reaction is not always a "one-way street," as we'll examine further in the next section, an arrow is drawn between the reactants and products to denote the direction of the reaction.
Our equation must have them in it in order for there to be an equal number of atoms of each element on both sides of the equation.
Therefore, Chemical reaction A, because the reactant is a compound is a statements correctly identifies the decomposition reaction and describes a substance involved.
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the plastic region of the stress-strain curve for a metal is characterized by
The plastic region of the stress-strain curve for a metal is characterized by a proportional relationship between stress and strain.
What is the usefulness of stress-strain curve?Stress-strain curve serves as the curve that help to show the relationship between stress and strain of a particular material especially in engineering.
With these curve the reaction of a material when a load is applied can be known before using the material for construction work.
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Why does carbonic acid gives an acid salt but hydrochloric acid does not?
Answer:
Solution. Carbonic acid is a dibasic acid with two replaceable hydrogen ions; therefore it forms one acid salt or one normal salt. Hydrochloric acid is a monobasic acid with one replaceable hydrogen ion and so forms only one normal salt.
Explanation:
What is the oxidation state of S in H₂SO4?
OA. +8
OB. +6
OC. -4
OD. -2
Answer:
B.) +6
Explanation:
To find the oxidation number of sulfur, we can assume the oxidation numbers of the other elements.
What I mean is, oxygen (O) always has an oxidation number of (-2). That being said, if there are 4 oxygen atoms, oxygen is contributing -8 overall. We also know that hydrogen generally has an oxidation number of (+1). Like before, if there are 2 hydrogens, it must be contributing +2.
If the overall molecule is neutral, we have to get these charges to balance out.
In essence, -8 + 2 + ? = 0?
If you combine the charges from oxygen and hydrogen, you are left with -6. Therefore, to make the molecule neutral, sulfur must have an oxidation number of +6.
2. If a student drops a 2.3 g piece of magnesium into a flask of hydrochloric acid, this reaction occurs: Mg + 2HCl MgCl2 + H2
How many liters of hydrogen can be produced at a pressure of 2 atm and a temperature of 298 K?
1.2 L of hydrogen can be produced at a pressure of 2 atm and a temperature of 298 K.
What is an ideal gas equation?The ideal gas law (PV = nRT) relates the macroscopic properties of ideal gases. An ideal gas is a gas in which the particles (a) do not attract or repel one another and (b) take up no space (have no volume).
Step 1: Write the balanced equation
Mg + 2 HCl ⇒ MgCl₂ + H₂
Step 2: Calculate the moles corresponding to 2.3 g of Mg
The molar mass of Mg is 24.31 g/mol.
2.3 g × 1 mol ÷24.31 g = 0.095 mol
Step 3: Calculate the moles of H₂ produced
0.095 mol Mg × 1 mol H₂ ÷ 1 mol Mg = 0.095 mol H₂
Step 4: Calculate the volume occupied by the hydrogen
We will use the ideal gas equation.
P × V = n × R × T
V = n × R × T÷P
V = 0.095 mol × (0.0821 atm.L/mol.K) × 298 K÷2 atm
V = 1.2 L
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The melting points of electrovalent compounds are higher than the melting points of covalent compounds. Why?
Explanation:
There is an electrostatic force holding the electrovalent bonds together and they're usually structured, whereas in covalent, they are usually free and are only held together by a very weak intermolecular force
7.0 mol Mn reacts with 5.0 mol
O2 according to the equation below:
2Mn + O₂ → 2MnO
How many moles of MnO form from
5.0 mol Mn?
? ] mol MnO
Round your answer to the tenths place.
Answer:
5.0 mol
Explanation:
From the coefficients of the equation, we know that for every 2 moles of Mn consumed, 2 moles of MnO are produced.
Thus, the number of moles of Mn consumed is equal to the number of moles of MnO produced, and thus the answer is 5.0 mol.
The moles of MnO formed with the reaction of 5 moles of Mn is 3 moles.
What is a limiting reagent?In a chemical reaction, the reagent that is present in a lesser quantity and governs the rate of the reaction is termed as the limiting reagent.
In the reaction of the formation of MnO, according to the stoichiometric law 2 moles of Mn reacts with 1 moles of Oxygen.
Thus, the moles of oxygen consumed by 7 moles of Mn is:
2 moles Mn = 1 mole O₂
7 moles Mn = 3.5 moles O₂
The available moles of O₂ = 5 mol.
The remaining moles of O₂ = 5-3.5 moles
The remaining moles of O₂ = 1.5 moles
The reaction of 5 moles Mn requires 2.5 moles of O₂, whereas the available moles of oxygen is 1.5 moles. Thus, oxygen serves as the limiting reagent.
The moles of MnO formed with the reaction of 5 moles Mn and 1.5 moles O₂
1 mole O₂ = 2 moles MnO
1.5 moles O₂ = 2 * 1.5 moles MnO
1.5 moles O₂ = 3 moles MnO
Thus, the moles of MnO formed with the reaction of 5 moles of Mn with the available oxygen is 3 moles.
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How many grams of nitrogen,
N2, would be required to react with
6.25 moles hydrogen, H2?
N₂ + 3H₂ → 2NH₃
moles N₂ = 1/3 x 6.25 = 2.083
Answer:
2.083 moles of N₂ would be required to react with 6.25 moles of H₂.
Explanation:
Let us first write the balanced chemical equation :
N₂ + 3H₂ → 2NH₃
Therefore from this equation it is clear that:
3 moles of H₂ require 1 mole of N₂
∵ 1 mole of H₂ requires [tex]\frac{1}{3}[/tex] moles of N₂
∵ 6.25 moles of H₂ requires [tex]\frac{(1*6.25)}{3}[/tex][tex]=2.083[/tex] moles of N₂
MOLE CONCEPT :
The mole is an amount unit similar to familiar units like pair, dozen, gross, etc. It provides a specific measure of the number of atoms or molecules in a bulk sample of matter. A mole is defined as the amount of substance containing the same number of discrete entities (such as atoms, molecules, and ions) as the number of atoms in a sample of pure 12C weighing exactly 12 g. One Latin connotation for the word “mole” is “large mass” or “bulk,” which is consistent with its use as the name for this unit. The mole provides a link between an easily measured macroscopic property, bulk mass, and an extremely important fundamental property, number of atoms, molecules, and so forth.
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