What is the principle of recrystallization of benzoic acid?
The recrystallization process can remove impurities from the original sample of benzoic acid and produce a purified product with high yield and purity.
Recrystallization is a technique used to purify a solid compound. The principle behind the recrystallization of benzoic acid is that benzoic acid is much more soluble in hot solvent (such as hot water) than in cold solvent. Therefore, if benzoic acid is dissolved in hot solvent and the solution is allowed to cool, the benzoic acid will crystallize out of the solution as it becomes less soluble in the cooler solvent.
The basic steps involved in the recrystallization of benzoic acid are as follows:
1) Dissolve the impure sample of benzoic acid in a minimal amount of hot solvent (e.g. hot water) to form a saturated solution.
2) Filter the hot solution to remove any insoluble impurities or particulate matter.
3) Allow the solution to cool slowly to room temperature or below, to encourage crystallization of the benzoic acid.
4) Collect the purified benzoic acid crystals by vacuum filtration, and wash the crystals with a small amount of cold solvent to remove any remaining impurities.
5) Dry the purified benzoic acid crystals to remove any remaining solvent.
For more questions on recrystallization -
https://brainly.com/question/28588509
#SPJ4
benzoic acid has limited solubility in water, but its conjugate base is completely soluble in water. draw the structure of the product formed when benzoic acid is treated with aqueous sodium hydroxide.
When benzoic acid (C7H6O2) is treated with aqueous sodium hydroxide (NaOH), it undergoes a reaction called a base-catalyzed hydrolysis.
This reaction results in the formation of the sodium salt of benzoic acid, also known as sodium benzoate (C7H5O2Na), and water (H2O). The reaction can be represented by the following equation:
C7H6O2 + NaOH → C7H5O2Na + H2O
The structure of sodium benzoate can be represented as follows:
O=C-C6H5-O-Na+
Here, the acidic proton (H+) from benzoic acid has been replaced by a sodium cation (Na+), creating a salt that is highly soluble in water.
Learn more about benzoic acid:
https://brainly.com/question/28299797
#SPJ4
Burner transfers 275kj of energy to 350g of liquid water at 22°c. What mass of the water would be boiled away
68.9g mass of the water would be boiled away
What is specific heat capacity?
The amount of heat needed to raise a substance's temperature by one degree Celsius per gram is known as its specific heat. Typically, calories or joules per gram per degree Celsius are used as the units of specific heat. For instance, water has a specific heat of 1 calorie (or 4.186 joules) per gram per degree Celsius.
The amount of energy necessary to raise the temperature of 1 kilogram of tissue by 1 K (=1°C) is referred to as the specific heat capacity of tissue.
Q= mcdeltT
= 350g x 418J x (100-20)c
= 117,040J
Q total = Q1+Q2
=275000J - 117040 J
= 157960 J (left in beaker)
Q = mdelt Hv
m = Q2/0h
= 157960 J / 2260J/g
= 69.8g
To learn more about specific heat capacity use link below:
https://brainly.com/question/28825214
#SPJ1
under what conditions are gases most likely to behave ideally?
At higher temperature and lower pressure, gases most likely to behave ideally.
An ideal gas is a hypothetical gas made out of many haphazardly moving point particles that are not expose to interparticle interactions. The ideal gas idea is valuable since it complies with the best gas regulation, a worked on condition of state, and is managable to investigation under factual mechanics. The necessity of zero communication can frequently be loose if, for instance, the connection is totally flexible or viewed as point-like crashes.
Under different states of temperature and tension, many genuine gases act subjectively like an ideal gas where the gas particles (or iotas for monatomic gas) assume the part of the best particles. Many gases, for example, nitrogen, oxygen, hydrogen, noble gases, a few heavier gases like carbon dioxide and combinations like air, can be treated as ideal gases inside sensible tolerances over an extensive boundary range around standard temperature and tension.
To know more about ideal gas,visit here:
https://brainly.com/question/8711877
#SPJ4
What is the chemical name of H2O?
The chemical names of H₂O includes Oxidane, Dihydrogen oxide etc.
Water's chemical name is dihydrogen oxide. It originated as the ions H and OH in water, which means that H is hydrogen and OH is oxide. Hence, by combining names, you will obtain dihydrogen monoxide, but as it is a hoax, although being technically accurate, it is not commonly utilized. Oxidane and hydrogen oxide go by other names.
Hydrogen and oxygen make up the elements of water. Water has the chemical formula H₂O because it contains two hydrogen atoms and one oxygen atom. Dihydrogen oxide is the name given to water in chemical terms.
To know more about water, visit,
https://brainly.com/question/1313076
#SPJ4
What are the activities of series of metals?
The metal activity series is an empirical tool used to predict the reactivity of products in substitution reactions and metals in substitution and ore mining reactions with water and acids.
The active series of metals is a table listing metals in order of decreasing reactivity of the elements. Generally, the more reactive metal is, the metal which is more strongly reacts with other metallic elements. The faster reaction, can lose electrons with faster rate to form positive charges or positive ions. Due to containment of reactivity order it is called the reactivity series. A series of activities determines the ability to displace hydrogen ions from water and other solutions such as acidic or ionic solutions. For example, sodium metal can displace hydrogen ions out of solution, so it is considered more reactive than elemental hydrogen. It helps determine the nature of the reaction and which element displaces another element in a chemical reaction.
To learn more about metal activity series, visit :
https://brainly.com/question/19482695
#SPJ4
In the control, the amplitudes of the action potentials at R1 and R2 are the same. Which of the following explains this?a. there are voltage-gated Na+ channels all along the axonb. the action potential is an all-or-none eventc. action potentials propagate or remake themselves at each point along the axond. all of these are reasonable explations
Along the whole axon, voltage-gated Na+ channels are present. It is an all-or-nothing event for the action potential. Each location along the axon sees the replication or propagation of action potentials. all of these are reasonable explanation.
What is an axon?In your brain, each neuron has a single, lengthy cable that extends from the cell's core. The place where an electrical impulse leaves a neuron's cell to be picked up by neighboring neurons is called an axon, which is a cable that is much thinner than a human hair.Information is transmitted via the axon to various neurons, muscles, and glands.The component of a nerve cell (neuron) known as the axon, also known as a nerve fiber, is responsible for carrying nerve impulses away from the cell body. Typically, a neuron contains one axon that connects it to other neurons, muscle cells, or glandular cells.Its root word, axon, which means "axle or axis," is Greek.To learn more about axon refer to:
https://brainly.com/question/14558084
#SPJ4
What volume, in liters, does 128 grams of O2 occupy at STP?
a.89.6 L
b.22.4 L
c.67.2 L
d.44.8 L
There are some important equations that we must know:
[tex]PV=nRT[/tex]
P = pressureV = volumen = molesR = Universal Gas Constant (8.31)T = temperature[tex]n=\dfrac{m}{M}[/tex]
m = massM = molar massSolving the QuestionWe're given:
molar mass of O2 = 32.00 g/molmass of O2 = 128 gT = 273 K (STP)P = 101.3 kPa (STP)First, solve for n:
[tex]n=\dfrac{m}{M}[/tex]
[tex]n=\dfrac{128}{32.00}\\\\n=4[/tex]
Now, solve using the Ideal Gas Law:
[tex]PV=nRT[/tex]
⇒ Isolate V:
[tex]V=\dfrac{nRT}{P}[/tex]
⇒ Plug in given values:
[tex]V=\dfrac{4*8.31*273}{101.3}\\\\V =89.6[/tex]
Answera. 89.6 L
Find the edge length of the cube. (the density of copper is 8. 96 g/cm3 , and the volume of a cube is equal to the edge length cubed. ).
The edge length of the cube is approximately 3.75 cm.
We can use the density and volume of the cube to find the edge length. Let's assume the edge length of the cube is "x" cm.
The volume of the cube is given by:
volume = x³
We can also use the density of copper to relate the mass of the cube to its volume:
density = mass / volume
Rearranging this equation, we get:
mass = density x volume
Substituting the given values, we get:
mass = 8.96 g/cm³ x (x cm)³
mass = 8.96 g/cm³ x x³
mass = 8.96x³ g
We can now set the mass of the cube equal to the mass of copper, which will allow us to solve for the edge length:
mass of cube = mass of copper
8.96x³ g = 500 g
Solving for x, we get:
x³ = 500 g / 8.96 g/cm³
x³ = 55.8036 cm³
Taking the cube root of both sides, we get:
x = (55.8036 cm³)^(1/3)
x ≈ 3.75 cm
Therefore, the edge length of the cube is approximately 3.75 cm.
Learn more about mass of copper here :
brainly.com/question/1782887
#SPJ4
What is the percent composition of water in the compound magnesium sulfate heptahydrate, MgDO4•7H2O?
A. 7.3%
B. 24.8%
C. 48.8%
D. 51.2%
The time required for half of a sample of a radioactive isotope to break down by radioactive decay to form a daughter isotope.a.Geologic columnb.Half-lifec.Absolute datingd.Absolute age
The time required for half of a sample of a radioactive isotope to break down by radioactive decay to form a daughter isotope is option (b) Half-life
The time required for half of a sample of a radioactive isotope to break down by radioactive decay to form a daughter isotope is referred to as the half-life of the isotope. This property is used in various scientific fields, including geology, archaeology, and nuclear physics.
In geology, the half-life of a radioactive isotope is used to determine the age of rocks and minerals through a method known as radiometric dating or absolute dating. By measuring the ratio of the parent isotope to the daughter isotope, scientists can calculate the age of a sample.
The geologic column refers to the layers of rocks and fossils that make up the Earth's crust, with the oldest layers at the bottom and the youngest at the top. Absolute age refers to the actual age of a rock or fossil, while absolute dating is a technique used to determine that age.
Therefore, the correct option is (b) Half-life
Learn more about Half-life here
brainly.com/question/16387602
#SPJ4
Please answer asap please
Answer:
A
Explanation:
A is closest to the sun. It follows from Kepler's second law that Earth moves the fastest when it is closest to the Sun.
This is the actual answer
Answer: it is red
Explanation: it is getting hotter
What are the main types of dyes?
The main types of dyes are Natural dyes, Synthetic dyes, Vat dyes, and Reactive dyes.
Dyes are dyes that are used to color items such as fabrics, paper, and food. There are several varieties of dyes, however, the following are the most common:
Natural dyes are made from natural sources such as plants, animals, and minerals.Synthetic colors are created by chemical processes and are man-made.Vat dyes: These are natural or manufactured dyes that require the addition of a reducing agent to create color. Cotton, denim, and other cellulosic fabrics are widely dyed using them.Reactive dyes are synthetic dyes that react chemically with the fibers of the colored material. They are noted for their colorfastness and brightness for dyeing natural textiles such as cotton, wool, and silk.Learn more about the dyes at
https://brainly.com/question/29109733
#SPJ4
what is the atomic mass of Fe?
The atomic mass of Fe (Iron) is 55.85 amu (Atomic mass unit).
The average mass of an element's atoms, commonly known as its atomic weight, is calculated using the average atomic mass and the relative abundance of isotopes within a naturally occurring element.
The atomic mass of such an atom serves as a measure of its size. The weight of an electron is so much lighter than that of the other particles that the mass of an atom is just that of the nucleus, despite the fact that the mass of an atom is theoretically the sum of the weights of its protons, neutrons, and electrons. The atomic mass of iron is therefore 55.85 amu.
To know more about atomic mass, visit,
brainly.com/question/14250653
#SPJ4
What is recycled in ATP cycle?
What is the Lewis structure for SO3 2?
The lewis structure of the SO₃²⁻ is as follows :
.. ..
: O : = S - : O :⁻
|
: O :⁻
°°
In the lewis structure of SO₃²⁻, the Central atom of theSO₃²⁻ion is the sulfur atom. Around the sulfur atom, there are the four bonds and the single lone pair in the lewis structure of the SO₃²⁻ion. Therefore, the five electron pair groups are around the central atom of the SO₃²⁻ion.
The total number of the valence electrons in the SO₃²⁻ is the 26 electrons. The sulfur is the less electronegative than the oxygen. Therefore the sulfur is the central atom.
To learn more about lewis structure here
https://brainly.com/question/20300458
#SPJ4
What are the 7 electrolytes?
The 7 electrolytes are sodium, calcium, potassium, chloride, phosphate, bicarbonates and magnesium.
Electrolytes are minerals and salts that are necessary for the body to function properly. They help regulate the body's water balance, pH, and nerve and muscle function. The seven most important electrolytes are sodium, calcium, potassium, chloride, phosphate and magnesium.
1) Sodium:
mineral mandatory necessary for regulating body fluids.
2) Calcium:
mineral element important for bone and teeth health.
3) Potassium:
mineral necessary useful for regulating heart rate and blood pressure.
4) Chloride:
electrolyte essential for regulating fluid balance in the body.
5) Phosphate:
mineral element important for energy production and cell membrane structure.
6) Magnesium:
mineral element useful for many metabolic processes in the body.
7) Bicarbonates:
are salts of carbonic acid, containing the anion [tex]HCO_{3}[/tex] - or its equivalent.
To know more about electrolytes:
brainly.com/question/17089766
#SPJ4
A pump releases water at a rate of 10 gallons every 45 days. What is the unit rate in gallons per week? enter your answer as a mixed number in simplest form in the box.
Unit rate in gallons per week is [tex]1\frac{5}{9}[/tex] gal/week,if a pump release water at a rate of 10 gallons every 45 days.
Unit rate is the proportion of two distinct units, with denominator as 1. For instance, kilometer/hour, meter/sec, miles/hour, pay/month, and so on. Number-crunching is presumably the most fundamental and old part of math and is regularly utilized in our everyday life. This subject is about the issues in light of numerals and tasks upon numerals. We in all actuality do tackle issues of math deliberately or accidentally during our day to day everyday practice. For instance - While buying vegetables or natural products, in different dealings or in assessing pace of something and so on.
To find the rate, we can first find out how much gallons is released in 1 day, and then find out how much gallons it releases in 7 days/1 week.
For one day rate, the pump releases 10/45 gal/day.
Then we multiply the rate by 7.
So,10/45/gal/day =(10/45)×7 = 70/45gal/day = 14/9gal/day =1[tex]\frac{5}{9}[/tex] gal/day
To know more about unit rate,visit here:
https://brainly.com/question/13795269
#SPJ4
Each different signal in a 1H NMR spectrum represents a different__________of hydrogen atom. Hydrogen atoms that are_______________give the same signal.type;equivalentopposite;weakerupfield;lowerincrease'greater
Each different signal in a 1H NMR spectrum represents a different set of hydrogen atom. Hydrogen atoms that are equivalent give the same signal.
There are three signals in total in 1H NMR spectrum. They are 1,3-dimethylbenzene, Hb that is situated between two methyl groups, the two Hc protons are one carbon away from a methyl group, and Hd is two carbons away from a methyl group. Hence, the four aromatic protons can be divided into three sets. The two methyl groups are equivalent to each other.
Generally, there are three isotopes of hydrogen used in NMR spectroscopy, which are 1 Hydrogen, 2 Deuterium and 3 Tritium. Each isotope resonates at much different frequency for example if 1H resonates at 400 MHz then 2H resonates at 61.402 MHz.
Learn more about NMR spectroscopy from the link given below.
https://brainly.com/question/21797445
#SPJ4
Select the correct answer from each drop down menu
Answer:
Atmoic weight / mass...........
If I gain electrons I become positive negative or equal
Negative
Explanation:
electrons are negatively charged
this element is in group 1 and has a higher atomic number than chlorine but a lower atomic number than bromine
Sodium is the element that is in group 1 and has a higher atomic number than chlorine but a lower atomic number than bromine.
What is element?An element is a material that, when heated or illuminated, can indeed be broken down into two or maybe more simpler compounds by any chemical technique. For example, when a piece of gold is melted, it still melts as well as stays the gold element.
Elements are thought to be the fundamental building units of matter. There seem to be 118 elements in all that exist today, 94 of which occur naturally and the remaining 24 are created artificially. Sodium is the element that is in group 1 and has a higher atomic number than chlorine but a lower atomic number than bromine.
Therefore, sodium is the element that is in group 1 and has a higher atomic number than chlorine but a lower atomic number than bromine.
To know more about element, here:
https://brainly.com/question/28223007
#SPJ9
how to write lewis structure of n2?
The lewis structure of the N₂ is as :
: N ≡ N :
The N₂ Lewis structure has the triple bond in between the two nitrogen atoms. According to the octet rule, the nitrogen atoms will need to bond the three times. The N₂ molecule is the diatomic, that means the two atoms of the same element are connected in the pair. The molecular geometry for the N₂ molecule will be the linear, with the bond angle of the about 180°.
The Nitrogen has the total number of the 5 valence electrons, so the doubling that, we will have the total of 10 valence electrons with the two nitrogen atoms.
To learn more about lewis structure here
https://brainly.com/question/20300458
#SPJ4
URGENTTTT
if S contributes a charge of -4, then what is the charge of the gold in AuS2?
The charge of the gold ion in AuS₂ is +4.
How to find a charge on a compound?The charge of the gold in AuS₂ can be determined by balancing the charges of the individual components. In this case, the sulfide (S) ion has a charge of -2, and there are two sulfide ions in AuS₂, so the total charge from the sulfide ions is -4. To balance this charge, the gold ion must have a charge of +4.
Therefore, the charge of the gold ion in AuS₂ is +4. This information can be used to write the balanced chemical equation for the formation of AuS₂, which would be represented as:
Au⁺⁴ + 2S⁻² → AuS₂
This equation shows that two sulfide ions with a charge of -2 are combining with a single gold ion with a charge of +4 to form the compound AuS₂.
Learn more on ionic charge here: https://brainly.com/question/22530066
#SPJ1
If an object experiences a change in temperature of 10 ⁰C, what is this temperature change in Kelvin?
If an object experiences a change in temperature of 10 ⁰C, The temperature change in Kelvin is 10 K.
To convert a temperature change from Celsius to Kelvin, you simply add 273.15 to the Celsius temperature change. However, this only applies to absolute temperatures, not temperature changes. For temperature changes, the conversion factor is 1:1, meaning that a change of 1 ⁰C is equal to a change of 1 K.
Here is the step-by-step explanation:
1. Start with the temperature change in Celsius: 10 ⁰C
2. Since the conversion factor for temperature changes is 1:1, the temperature change in Kelvin will also be 10 K.
3. Therefore, the temperature change in Kelvin is 10 K.
In conclusion, if an object experiences a change in temperature of 10 ⁰C, the temperature change in Kelvin will also be 10 K.
Learn more about Kelvin at:
https://brainly.com/question/18038227
#SPJ11
A flask filled with carbon dioxide is heated from 10. °C to 40. °C. The starting pressure was 98 kPa, what is the final pressure?
Considering the Gay-Lussac's law, if a flask filled with carbon dioxide is heated from 10. °C to 40. °C and he starting pressure was 98 kPa, the final pressure is 108.39 kPa.
Definition of Gay-Lussac's lawGay-Lussac's law establishes the relationship between the temperature and the pressure of a gas when the volume is constant: If the temperature increases, the pressure will increase and if the temperature decreases, the pressure will decrease.
That is, the pressure of the gas is directly proportional to its temperature and is expressed mathematically as:
P÷T=k
where:
P is the pressure.T is the temperature.k is a constant.Analyzing an initial state 1 and a final state 2, it is fulfilled:
P₁÷T₁=P₂÷T₂
Final pressure in this caseIn this case, you know:
P₁= 98 kPaT₁= 10 C= 283 K (being O C= 273 K)P₂= ?T₂= 40 C= 313 KReplacing in Gay-Lussac's law:
98 kPa÷ 283 K=P₂÷ 313 K
Solving:
(98 kPa÷ 283 K)× 313 K=P₂
108.39 kPa= P₂
Finally, the final pressure is 108.39 kPa.
Learn more about Gay-Lussac's law:
https://brainly.com/question/4147359
#SPJ1
in dmd, the dystrophin protein is too short. the code for making dystophin starts with which important molecule?
The code for making dystrophin starts with DNA (deoxyribonucleic acid), which is a molecule that carries the genetic instructions used in the growth, development, functioning, and reproduction of all living organisms.
Duchenne muscular dystrophy (DMD) is a genetic disorder caused by mutations in the dystrophin gene located on the X chromosome. The dystrophin protein plays an important role in maintaining the structure and function of muscle fibers. In individuals with DMD, the dystrophin protein is too short or absent, which leads to progressive muscle weakness and loss of function.
The process of making dystrophin starts with the genetic code that is stored in the DNA molecule. The DNA is transcribed into messenger RNA (mRNA), which carries the genetic code from the nucleus to the ribosomes in the cytoplasm of the cell. The ribosomes then use the mRNA as a template to synthesize the dystrophin protein through a process called translation.
In individuals with DMD, mutations in the dystrophin gene can cause errors in the genetic code, which can lead to a shortened or non-functional dystrophin protein. Without a fully functional dystrophin protein, muscle fibers are more susceptible to damage and degeneration, which can lead to the symptoms of DMD.
Learn more about DNA here https://brainly.com/question/264225
#SPJ4
Is HBr hydrogen bromide or hydrobromic acid?
How many moles are in 29.4 L of C2H6O gas at STP?
Answer: 27
Explanation: so if u divide the thingy from the thingy to a thingy u get a thingy