In carrying out the first standardization in this experiment, a student used 0.5793 g of potassium hydrogen phthalate (khp) and 24.55 ml of a NaOH solution are needed to reach the equivalence point then the concentration of student NaOH solution is 0.02455 L
Standardization is the process in which determining the exact concentration of molarity of the solution and here given data is
Mass of potassium hydrogen phthalate (C₈H₅KO₄) = 0.5793 g
Molar mass of potassium hydrogen phthalate (C₈H₅KO₄) = 204.22g/mol
The number of mole of potassium hydrogen phthalate present then,
Number of moles = mass/molar mass
Number of moles = 0.5793 g/204.22g/mol = 0.002836 mole
Volume of NaOH present = 24.55 ml
1 ml = 0.001 L then, 24.55 ml = 24.55 ml×0.001 L = 0.02455 L
The concentration (in mol/l) of the student's naoh solution is 0.02455 L
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A waste management specialist for a city is designing a recycling program to reduce the amount of synthetic materials that enter the local landfill. Which of the following criteria would be best for the specialist's design? A. to make it easy for the residents of the city to recycle synthetic materials B. to keep anything made of natural materials from entering the landfill C. to make residents travel a long distance to recycle synthetic materials D. to keep residents from using anything made of synthetic materials
Option A would be the right recycling program to reduce the number of synthetic materials that enter the local landfill. Hence option A would be the suitable criteria for the specialist's design.
Option A is correct because, with the providence of the knowledge to recycle synthetic materials, there will be less waste accumulation. Hence most synthetic materials can be expected to be recycled.
Option B is wrong because restricting natural materials from entering the field will further increase the use of synthetic materials. Hence there will be more accumulation of waste.
Option C is wrong because making the residents travel long distances will be tiresome, and the outcome of disposing of them will be little.
Option D is wrong because synthetic materials are valuable in various manufacturing and widely used in our daily lives. Hence we will lose the potential benefits.
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QUESTION 1How many molecules of C6H12O6 are in 200. grams of C6H1206?
To find the number of molecules we must apply for Avogadro's number. This number tells us that in one mole of any substance there are 6.022x10^23 molecules. So the first thing we will do is find the moles contained in 200 grams of C6H12O6 (Glucose).
The molar mass of glucose is 180.06g/mol. So, the moles of glucose will be:
[tex]molC_6H_{12}O_6=givengC_6H_{12}O_6\times\frac{1molC_6H_{12}O_6}{MolarMass,gC_6H_{12}O_6}[/tex][tex]molC_6H_{12}O_6=200.gC_6H_{12}O_6\times\frac{1molC_6H_{12}O_6}{180.06gC_6H_{12}O_6}=1.11molC_6H_{12}O_6[/tex]Now, we apply for Avogadro's number. So, the molecules of glucose will be:
[tex]\begin{gathered} moleculesC_6H_{12}O_6=givenmolC_6H_{12}O_6\times\frac{6.022\times10^{23}molecules}{1molC_6H_{12}O_6} \\ moleculesC_6H_{12}O_6=1.11molC_6H_{12}O_6\times\frac{6.022\times10^{23}molecules}{1molC_6H_{12}O_6} \\ moleculesC_6H_{12}O_6=6.68\times10^{23}molecules \end{gathered}[/tex]Answer: In 200 grams of C6H12O6 there are 6.68x10^23 molecules
An instructor has a jar of sulfur that contains 16 grams. The students are asked how many sulfur atoms are in the jar. Four students give the following responses:
Arlo says, "There are 1/2 times Avogadro's number of sulfur atoms in the jar."
Bob says, "There are sixteen sulfur atoms in the jar."
Celine says, "There are two times Avogadro's number of atoms in the jar."
Delbert says, "There are sixteen times Avogardro's number of atoms in the jar."
With which, if any, of these three students do you agree:
Arlo,
Bob,
Celine,
Delbert, or
I don't think any of these students are correct
The student with the correct statement is Arlo.
How to determine the number of atomsFirst, we shall determine the mole of sulphur in the jar. This can be obtained as follow:
Mass of sulphur = 16 gramsMolar mass of sulphur = 32 g/moleMole of sulphur =?Mole = mass / molar
Mole of sulphur = 16 / 32
Mole of sulphur = 1/2 mole
Finally, we shall determine the number of atoms in the jar. This can be obotained as follow:
From Avogadro's hypothesis,
1 mole of sulphur = 6.02×10²³ atoms
Therefore,
1/2 mole of sulphur = 1/2 × 6.02×10²³ atoms
1/2 mole of sulphur = 1/2 × Avogadro's number
Thus, the number of sulphur atom is 1/2 times Avogadro's number
Therefore, Arlo is correct.
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Now read the question sooner passes an electric current through a sample of clear odorless colorless liquid as the experiment continues bubbles form and the volume of liquid and decreases soon eclectic samples of two colorless odorless gases that bubble out of the liquid one of these gases burn neither of neither the original nor the other gas burns which is the best explanation of her results
The best explanation will be that the sample was broken down by the electric current and formed a new substance that could burn. Therefore, the original liquid is a compound.
The utilization of the electric current to break down substances is called electrolysis.
The case displayed is the same as the electrolysis of water: the electrical current breaks down the water (a compound) into the components that frame it: hydrogen (a gas that burns) and oxygen (a gas that does not burn).
The test was broken down by the electric current and shaped into an unused substance that seems to burn. Hence the initial fluid may be a compound.
Bypassing an electric current through a test of clear, colorless, and odorless fluid. As the trial proceeds, bubbles shape, and the volume of fluid diminishes.
As the test proceeds, bubbles shape, and the volume of fluid diminishes. Suna collects tests of two colorless, odorless gasses that bubble out of the fluid. One of the gasses burns. Not one or the other the first fluid nor the other gas burns.
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the volume vv of an ideal gas varies directly with the temperature tt and inversely with the pressure pp . a cylinder contains oxygen at a temperature of 310310 degrees k and a pressure of 1818 atmospheres in a volume of 120120 liters. find the pressure if the volume is decreased to 9595 liters and the temperature is increased to 320320 degrees k.
The final pressure of the ideal gas is 23.47 atm.
We need to know about the ideal gas theory to solve this problem. The ideal gas is assumed that there is no interaction between particles in a gas. It can be determined by the equation
P . V = n . R . T
where P is pressure, V is volume, n is the number of moles gas, R is the ideal gas constant (8.31 J/mol.K) and T is temperature.
From the question above, we know that
V1 = 120 L
P1 = 18 atm
T1 = 310 K
V2 = 95 L
T2 = 320 K
When the initial and final gas is the same, we can use the ratio of the ideal gas as
(P2 . V2) / (P1 . V1) = T2 / T1
(P2 . 95) / (18 . 120) = 320 / 310
P2 = 23.47 atm
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Pls help!
Many thanks
The shortest covalent bond is the H-F bond. Therefore, option (A) is correct.
What is the bond length order of hydrogen halides?The electronegativity decreases down the group and the Fluorine is the most electronegative atom in the periodic table. The size of the atoms also increases as we go down the group.
The bond length of the hydrogen halides will follow the order HF < HCl < HBr < HI. The radius of the Iodine atom is the largest and to form a molecule, the hydrogen atom will be farthest as compared to all hydrogen halides.
The molecule with Fluorine will have the shortest bond length because its atom has the smallest size, making them attach very closely. So the covalent bond of hydrogen fluoride will be the shortest.
The relationship between bond length and bond strength is inverse in nature. The bond length of HI is the greatest, it will have the least bond strength. So the order for bond strength of the hydrogen halides is HF > HCl > HBr > HI.
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Which polymer are synthetic
Answer:
Examples of synthetic polymers include nylon, polyethylene, polyester, Teflon, and epoxy.
phosphoric acid, h3po4(aq), is a triprotic acid, meaning that one molecule of the acid has three acidic protons. estimate the ph and the concentrations of all species in a 0.400 m phosphoric acid solution.
This implies that pH is 1.3566.
[H2PO4-] is same as [H+] and [H3PO4] = 0.4 - 4.4 * 10^-2 = 0.356.
What is pH?
Acids and bases can be measured using a pH scale. The scale has a range of 0 to 14. An indicator called Litmus paper is used to determine whether a substance is an acid or a base. The type of substance being tested is indicated by the colour of the paper, which corresponds to the pH scale's numbers. For instance, vinegar is an acid and has a pH of 2.4. Doctors and scientists typically concur that maintaining a healthy pH balance is important for your overall health. Your diet and beverage choices have an impact on your body's pH level and potential hydrogen content. The concentration of hydrogen ions is measured by pH. On a pH scale, this calculation is based.
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What do cocaine, amphetamines, caffeine, nicotine, and MDMA (ecstasy) all have in common?
Select one:
a.
They all increase the activity of the nervous system.
b.
They all cause hallucinations.
c.
They are all taken by people who want to relax or go to sleep.
d.
They are all very highly addictive both physically and psychologically.
Cocaine, amphetamines, caffeine, nicotine, and MDMA (ecstasy) have in common that they all increase the activity of the nervous system (Option a).
What are stimulant drugs?The expression stimulant drugs is used in biology and medicine to describe chemical substances that speed up the velocity in which messages are transmitted between nerve cells, which is common to caffeine, nicotine cocaine and ecstasy.
Therefore, with this data, we can see that stimulant drugs are able to increase the velocity in which messages are transmitted in the nervous system.
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in the laboratory, a student dilutes 12.4 ml of a 10.1 m hydrochloric acid solution to a total volume of 125.0 ml. what is the concentration of the diluted solution? concentration
The concentration on diluting the solution by student is 1 M.
The concentration and volume are related to each other as - [tex] M_{1}[/tex] [tex] V_{1}[/tex] = [tex] M_{2}[/tex] [tex] V_{2}[/tex], where [tex] M_{1}[/tex] and [tex] M_{2}[/tex] are initial and final molarity and [tex] V_{1}[/tex] and [tex] V_{2}[/tex] are initial and final volume.
[tex] M_{1}[/tex] is 10.1 M, [tex] V_{1}[/tex] is 12.4 milliliters, [tex] M_{2}[/tex] is to be calculated and [tex] V_{2}[/tex] is 125 milliliters.
Keep the values in formula to find the value of [tex] M_{2}[/tex].
10.1×12.4 = [tex] M_{2}[/tex]×125
[tex] M_{2}[/tex] = 125.24 ÷ 125
Performing division on Right Hand Side of the equation
[tex] M_{2}[/tex] = 1.00192 M or 1 M.
Thus, the concentration of diluted solution is 1 M.
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how many Ca moles are there in 6.2 g of Ca3(PO4)2 ?
According to the mole concept, there are 0.02 moles in 6.2 g of calcium phosphate.
What is mole concept?According to mole concept,mole is defined as the unit of amount of substance . It is the quantity measure of amount of substance of how many elementary particles are present in a given substance.
It is defined as exactly 6.022×10²³ elementary entities. The elementary entity can be a molecule, atom ion depending on the type of substance. Amount of elementary entities in a mole is called as Avogadro's number.
It is widely used in chemistry as a suitable way for expressing amounts of reactants and products.For the practical purposes, mass of one mole of compound in grams is approximately equal to mass of one molecule of compound measured in Daltons. Molar mass has units of gram per mole . In case of molecules, where molar mass in grams present in one mole of atoms is its atomic mass.
In the given problem, number of moles is found out by, mass/molar mass
that is,6.2/310= 0.02 moles.
Hence, there are 0.02 moles in 6.2 g of calcium phosphate.
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What Is the ionic equation for 4HCl (aq) + MnO₂ (s) -> MnCl₂ (aq) + 2H₂O (l) + Cl₂ (g)?
Answer:
Explanation:
answer is below
An atom with 12 electrons and 11 protons is what kind of atom?
A: an anion
B: an cation
C: an isotope
D: a neutral atom
Answer: It's an Anion
Explanation: It has gained 1 extra electron and so the atom is now a negatively charged ion called an Anion.
A chemical element is uniquely defined by its atoms, which are tiny pieces of matter.
An atom with 12 electrons and 11 protons is an anion.
What is meant by an atom?The smallest component of ordinary matter that makes up a chemical element is an atom. Atoms that are neutral or ionized make up every solid, liquid, gas, and form of plasma. Atoms are incredibly tiny, measuring typically 100 picometers across.
A chemical element is uniquely defined by its atoms, which are tiny pieces of matter. An atom is made up of a central nucleus and one or more negatively charged electrons that orbit it. The positively charged, relatively heavy protons and neutrons that make up the nucleus may be present.
Therefore, the correct answer is option A: an anion.
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If a silver ion has 47 protons and 46 electrons, what is the overall charge on the ion?
A) 0
B) +1
C) -1
HElp me please!!!!!!!!!!!!!!!!!!!!!
If a student wants to demonstrate the size of a magnetic field to a friend, an activity which the student should perform is to: sprinkle iron filings around the magnet, and observe the pattern in which the iron filings arrange themselves.
What is the law of magnetism?The law of magnetism states that the like poles of a magnet would repel one another while unlike (different) poles would generally attract each other.
This ultimately implies that, two north (N) poles of a magnet would repel one another while a north (N) and south (S) would attract each other.
Based on the law of magnetism, we can reasonably infer and logically deduce that this student should sprinkle iron filings around a magnet, and then observe the pattern in which these iron filings would be arranged the length of the magnet.
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Complete Question:
A student wants to demonstrate the size of a magnetic field to a friend. Which activity should the student perform?
answer choices
Suspend a magnet freely using a thread, and compare its alignment with a compass.
Cut a magnet in half, and bring the halves together to show they attract each other.
Sprinkle iron filings around the magnet, and observe the pattern in which the iron filings arrange themselves.
Rub an iron bar with a magnet, and bring the bar close to the magnet to show that they attract each other.
if the rate of reaction increases by a factor of 9.6 when the concentration of reactant increases by a factor of 3.1, what is the order of the reaction with respect to this reactant?
If the rate of reaction increases by a factor of 9.6 when the concentration of reactant increases by a factor of 3.1 then order of the reaction with respect to this reactant is 1/3
Rate of reaction is the speed at which a chemical reaction proceeds
Here given data is
Rate of reaction = 9.6
Concentration of reactant = 3.1
We have to calculate order of the reaction = ?
So we can write
R = K[C]ⁿ
Where R is the reaction rate and K is a constant
Here C is the concentration of the reactant
rate of reaction increases by a factor of 9.6 when the concentration of reactant increases by a factor of 3.1 then
9.6 = K× [3.1]ⁿ
Dividing this equation we get
1/9.6 = 1/3.1ⁿ
3n = 1
n = 1/3
Then the order of the reaction with respect to this reactant is 1/3
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Energy transfers between particles when they ______?
Energy transfers between particles when they collide.
When the particles collide they vibrate and energy get transferred between the particles. The particles that made matter are in constant motion and have high kinetic energy. kinetic energy is equal to heat. Energy is the ability to do work. When energy moves from one place to another place we can say that energy is transferred . so in case of particle s, particles are in continuous motion and colloid with each other and when the particles collide with each other the energy transfer between particles takes place.
Thus, Energy transfers between particles when they collide.
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How many grams of Cu are obtained by passing a current of 12 A through a solution of CuSO4 for 30 minutes?
The quantity of Cu deposited at the cathode will be 7.117 grams.
Given,
Current (in Amperes) = 12 A
This will be equal to 12 C/s (in coulombs per second).
Therefore the total charge in 30 minutes will be:
Q = 12C/s × 30 min × 60 seconds/minute
=> Q = 21600 C
Now, the number of moles of copper which are plated out (n) will be :
n = Q / z·F
In the half-cell reaction,
the number of electrons ( for Cu ) will be = 2 (Cu 2+)
F, the Faraday's constant = 96,485 per mole
We have already discussed that,
n = Q / z.F
=> n = 21600 / (2×96485)
=> n = 0.112 mol
So, 0.112 mol of Cu will be equal to:
0.112×63.546 = 7.117 g
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based on the reconstructed temperatures you saw and changes in solar irradiance and co2 concentrations over the past millennium, what century do you expect to have the largest simulated temperatures from the gcms?
20th century was expected to have the largest simulated temperature from the gas chromatography mass spectrometry.
What is temperature and gcms and what century had largest temperatures from gcms?Temperature is the measure of degree of hotness and coldness wither of a substance or a region.Gcms is gas chromatography-mass spectrometry is a complex analysis phenomena in which first gas samples are analyzed first.The sample of solid, liquid and gas are taken and in case of liquid the sample is vapourized to detect the presence of substance.Here the question is asking which century had most temperature from gas chromatography and mass spectrometry.Hence 20th century was supposed to have maximum temperature from gas chromatography and mass spectrometry.To know more about temperature visit:
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What physical property is characteristic of all of the elements in the group located in Family VIIIA of the periodic table?
All of the elements in the group located in Family VIIIA of the periodic table are highly unreactive.
The elements of Family VIIIA are also known as noble gas elements. Noble gases are low chemically reactive, odorless, colorless, nonflammable, and monotonic gases.
These elements have very little ability to gain or lose electrons to form ions or share electrons with other elements in covalent bonds because they contain a full octet of eight valence electrons in their highest-energy orbitals (ns2np6). That is why they are exceedingly stable and unlikely to form chemical connections.
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during a fermentation experiment in lab, two different samples of grape juice have been inoculated with yeast. air has been evacuated from sample i, but not from sample ii. in which sample would you predict to the greater alcohol production?
Sample 1 is you predict greater alcohol production.
The electron transport chain produces the majority of ATP from all three major phases of cellular respiration. Metabolism is the chemical reaction within the body's cells that convert food into energy. Our bodies need this energy to do everything from moving to thinking to growing. Certain proteins in the body control metabolic chemical reactions.
The compound that produces the most ATP when fully oxidized is glucose. Glycolysis and aerobic oxidation of glucose by the TCA cycle generate 32 ATP. However, the acetyl-CoA molecule can not enter glycolysis. Cellular respiration that occurs without oxygen is anaerobic respiration. Cellular respiration that occurs in the presence of oxygen is aerobic respiration.
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Which form of energy can be connected closely to climate change?
a) coal
b) wind
c) hydroelectric
d) solar
Answer:
coal
Explanation:
If 1. 00 kg of zn reacted with excess sulfur, how much energy would be released?.
The energy that is going to release in Zn-sulfur reaction is 3168.92 kJ.
The chemical equation of the given Zn-sulfur reaction is :
Zn + S →Zn + 205.98 kJ
The molar mass of the zinc is 65 g.
1 mole is equivalent to 65 g of zinc which means the amount of energy released by 1.00 kg zinc is :
1 kg = 1000 g
Now,
205.98/65 g × 1000g
= 3168.92 kJ
The total energy released is 3168.92 kJ.
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after completing the experiment, a student extracts a sample of calcium carbonate with a mass of 0.818 grams from an antacid tablet that claims to have 1000 mg of calcium carbonate. what is the percent error in this student's experiment? round your answer to two decimal places. correct! 18.2
After calculating the percent error and rounding it to two decimal places, the result obtained is 18.20%.
To calculate the percent error we need to calculate the absolute error first. This is done by subtracting the actual value (1000 mg) from the measured value (0.818 g = 818 mg):
818 mg - 1000 mg = -182 mg
We then divide the absolute value of that difference (182 mg) by the actual value (1000 mg).
182 mg / 1000 mg = 0.182
This result is then multiplied by 100 percent and rounded to two decimal places:
0.182 * 100% = 18.20%
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How does the conductivity of metalloids compare to the conductivity of metals and nonmetals?
Metalloids conduct electricity better than metals, but not as well as nonmetals.
Metals, metalloids, and nonmetals all have the same level of conductivity.
Metalloids conduct electricity better than nonmetals, but not as well as metals.
Metalloids cannot conduct electricity.
The conductivity of metalloids can be compared to the conductivity of metals and nonmetals because metalloids conduct electricity better than nonmetals, but not as well as metals (Option C).
What are metalloids?The expression metalloids is a term used to denote chemical elements that have features resembling metals such as an acceptable electrical conductivity, but they are not metals (e.g. boron, germanium, antimony, arsenic, polonium, etc).
Therefore, with this data, we can see that metalloids are similar to metals in electrical conductivity but they are not metals because they do not fit all properties of metals.
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What reaction is used to remove one phosphate group from ATP?A. hydrolysis reactionB. redox reactionC. combustion reactionD. neutralization reaction
Answer:
A. hydrolysis reaction.
Explanation:
Chemical Reactions.
First, let's review each concept of the group of answer choices:
- hydrolysis: is a reaction in which the net reaction is an organic compound reacting with water to give either two molar equivalents of a single product or more than one product.
- redox: is a type of chemical reaction that involves a transfer of electrons between two species.
- combustion: is a reaction in which a substance reacts with oxygen gas, releasing energy in the form of light and heat.
- neutralization: is a reaction that occurs when an acid and a base react to form water and a salt and involves the combination of H+ ions and OH- ions to generate water.
The problem is asking for the reaction that removes a phosphate group from ATP, so let's see the structure of ATP with one phosphate group:
What is enclosed in the red box is the phosphate group.
The reaction that removes this phosphate group represents a rupture of the structure and based on the logic of the definitions of the given concepts, the answer would be that the reaction to remove one phosphate group from ATP is A. hydrolysis reaction. This reaction looks like this:
ATP + water (H2O) -> ADP + Pi,
where ADP is the same molecule of ATP but it has two phosphate groups and Pi is the phosphate group removed.
Calculate the % Composition of the following compounds, remember that the decimal has to move 2 places at the end. (NH4)2CO3
The percent composition of (NH₄)₂CO₃ is 99.999 % ≈ 100 %.
To calculate percent composition of the elements in a compound,
the molar mass of element is divided by the molar mass of the compound and then, it is multiplied by 100.
We know that,
Molar mass of (NH₄)₂CO₃ is 96.086 g/mol.
Molar mass of each element of compound is-
Nitrogen = 2 × 14.007 g/mol = 28.014 g/mol
Hydrogen = 8 × 1.008 g/mol = 8.064 g/mol
Carbon = 1 × 12.011 g/mol = 12.011 g/mol
Oxygen = 3 × 15.999 g/mol = 47.997 g/mol
Now,
We will calculate the percent composition -
% composition of nitrogen = 28.014 g/mol × 100 = 29.155%
96.086 g/mol
% composition of hydrogen = 8.064 g/mol × 100 = 8.392%
96.086 g/mol
% composition of carbon = 12.011 g/mol × 100 = 12.500%
96.086 g/mol
% composition of oxygen = 47.997 g/mol × 100 = 49.952 %
96.086 g/mol
We will add the percentage to calculate % composition of (NH₄)₂CO₃ -
29.155 % + 8.392 % + 12.500 % + 49.952 % = 99.999% ≈ 100 %
Therefore, % composition is 99.999 % ≈ 100 %
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an open flask sitting in a lab refrigerator looks empty, but it is actually filled with a mixture of gases called air. if the flask volume is 4.50 l, and the air is at standard temperature and pressure, how many gaseous molecules does the flask contain?
At standard temperature and pressure, the number of gaseous molecules that the flask contains is equal to 1.2098 × 10^23.
According to the given data, the volume of the flask is equal to 4.50 L.
As the volume occupied by one mole of any gas at standard temperature and pressure is 22.4 liters, therefore the number of moles in the flask can be calculated as follows;
n = 4.5 ÷ 22.4
n = 0.2009
As one mole is equal to 6.02 × 10^23 units
The number of gaseous molecules in the flask can be calculated as follows;
0.2009 × ( 6.02 × 10^23 ) = 1.2098 × 10^23
Hence, the number of gaseous molecules in the flask is calculated to be 1.2098 × 10^23.
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Which of the following is not a factor that affects temperature?
Longitude
Altitude
Ocean currents
Latitude
what is the molarity of a solution that contains 53.0 g of vitamin b1 hydrochloride (with a molar mass of 337 g/mol ) in 220. ml of solution? express the concentration in molarity.
The molarity of the Vitamin B1 Hydrochloride solution is 0.71M.
We know,
Molarity of a solution is defined as the ratio of the moles of the solute with respect to the volume of the solution in liters.
We know,
Moles = mass of solute dissolved/Molar mass of solute
Given mass of solute is dissolved is 53 grams.
Molar mass of Vitamin B1 Hydrochloride is 337 grams/mol
Moles of Vitamin B1 hydrochloride = 53/337
The volume of the solution is 220 ml.
We know,
1 ml = 1/1000 litres
220 ml = 220/1000 litres
So, putting all the values in the formula of molarity,
Molarity of solution = (53/337)/(220/1000)
Molarity of solution = 0.71
So, the concentration of the Vitamin B1 Hydrochloride is 0.71M.
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