The answer of this question is 123.87 g
Here we have to find the molar mass of unknown solvent
Given,
freezing point of cyclohexane sample =6.20°c
freezing point of resulting solution =4.11°c
Delta Temperature(Δt) = kf × molality for finding molality
Moles = grams / molar mass
Molality = moles / kg solvent
In cyclohexane, the mass of mixed solute = 0.4 × 609
Solute mixed in cyclohexane and mixed in cycloheptene= 0.4^2 × 1000 / 36 π
Del Temperature (Δt)= kf × molality
= 2.0920 × 0.4 × 1004 / 36 × 2.09
M = 9320 / 73.29
= 123.87
Molar mass of an unknown solvent = 123.87 grams
so, the answer of this problem is 123.87 g
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The actual density of a certain material is 7.48g/cm^3. a student measures the density of the same material as 7.2g/cm^3.what is the percent error of the measurement? answer in units of %
The actual density of a certain material is 7.48g/[tex]cm^{3}[/tex]. a student measures the density of the same material as 7.2g/[tex]cm^{3}[/tex]. the percent error of the measurement is 3.74 %.
Percent Error is defined as difference between experimental value and the theoretical value divided by theoretical value and multiply by 100.
Percent Error =( | experimental value - theoretical value | ) / 100 %
here,
experimental value = 7.2 g/ [tex]cm^{3}[/tex]
theoretical value = 7.48 g/[tex]cm^{3}[/tex]
percent error ( % error) = ( | 7.2 - 7.48 | ) / 7.48 × 100 %
=( 0.28 / 7.48 ) × 100 %
= 3.74 %
Thus,The actual density of a certain material is 7.48g/[tex]cm^{3}[/tex]. a student measures the density of the same material as 7.2g/[tex]cm^{3}[/tex]. the percent error of the measurement is 3.74 %.
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What are some examples of situations in which gel electrophoresis is used and the types of molecules that scientists separate using the technique.
Answer:
When the molecules are placed in the individual wells they are all at the same distance because al the wells were created with the same comb. Gel electrophoresis is applying an electrical current to separate the molecules. Once gel electrophoresis is ran, the negative dyes will run towards the positive end of the gel and the positive dyes will run towards the negative end of the gel. The heavier dyes will run a shorter distance compared to the lighter dyes, this is how they are separated out.
Explanation:
Answer:
A situation gel electrophoresis is used in DNA fragments like in a crime scene or to distinguish species.
Explanation:
how many electrons are in 40 Ne?
40 Ne has 10 electrons which consist of 10 protons and 10 neutrons
Neon is a chemical element which is rare gas or noble gas as it has a stable octet electronic configuration, meaning it has 8 valence electrons in its outermost shell.
Neon belongs to group 0/VIII and period 1 of the periodic table.
What is an element?An element is a substance which takes part in a chemical reaction. There are different classes of elements which includes the metals, nonmetals and the metalloids.
So therefore, 40 Ne has 10 electrons which consist of 10 protons and 10 neutrons.
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tion 6 of 30
at type of nucleus is the strong nuclear force greater than the
rostatic force?
Answer:
bro you can explane why is so hard
Explanation:
Kaseem is taking his bicycle for a ride. His bicycle is a system, and its main purpose is to provide transportation. What is the desired output of this system
The desired output of this system which involves a bicycle for transportation is the bicycle forward motion.
What is Transportation?This is defined as the process in which goods and people are moved from one location or place to another through the use of vehicle such as bicycle, motorcycle etc.
When riding a bicycle, the input is the force which is exerted on the pedal with the use of the legs and it then results in the bicycle moving forward (forward motion) and is referred to as the output which is therefore the reason why it was chosen as the most appropriate choice.
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the bohr model describes what is possible outside the nucleus of an atom. one of the limitations of this model is that it only works for atoms or ions that have the same number of electrons as hydrogen. how many electrons does a hydrogen atom possess? fill in a number in the blank provided.
The bohr model describes that the electron is possible outside the nucleus of an atom. Electrons are negatively charged exist in orbits around the nucleus.
Because we assume that the only source of centripetal force is the nucleus's electrostatic force of attraction when we calculate the formula for a radius, energy levels, etc. Therefore, this only applies to atoms with a single electron. Repulsion caused by other electrons will also exist in multi-electron atoms.
Hydrogen atoms contain one electron, which is located outside the nucleus. With two protons, helium will also have two electrons.
The limitation with Bohr's model is that it performs admirably for atoms with just one electron, such as H or He+, but appallingly poorly for atoms with multiple electrons.
The atom of hydrogen possesses only one electron which are present outside the nucleus.
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Forensic scientists use science to find evidence at a crime scene. Which sentence describes how forensic scientists could use observation to determine the time that a crime scene took place?
By looking at the body they can come up with an estimated time of how long it’s been without oxygen(dead).
An ancient copper coin was found to absorb 545.8 J of heat when the temperature increases 31.4°C. The specific heat of copper is 0.387 J/g'C. What is the mass of the copper coin?
The mass of the Copper coin is 44.9g
Given that,
q = 545.8 J ; c = 0.387 J/g°C ; ΔT = 31.4°C
To find the mass of the copper the following formula which is used to find the heat absorbed by a substance is to be used:
q = mcΔT
where
q = quantity of the heat
m = mass of the substance
c = specific heat capacity of the material
ΔT = change in the temperature
Therefore, on rearranging the formula to find the mass of copper coin we get,
m = q/cΔT
On substituting the values of q, c and ΔT we get
m = 545.8 J/(0.387 J/g°C * 31.4 °C)
On solving we get,
m = 44.9g
Therefore the mass of the copper coin is 44.9g.
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PLEASE HELP QUICKLY I'M REALLY CONFUSED AND NEED THIS IS SIMPLE DEFINITION
why do positive ions grow from left to right, and negative from right to left?
Answer:
It is quite known that in case of electrolyte there are no electrons. The electric current is basically due to flow of ions.
? Question
elect the correct answer from each drop-down menu.
Complete this paragraph, which describes an ice cube changing from a solid to a liquid to a gas.
Water can exist in three states of matter. Imagine examining the changes of state from solid to liquid to gas by adding
▼ to ice. What would change or not change?
The size of the water molecules
As water changes state, the mass of the sample
However, the
of the water molecules does change during a change in state. The
evidence that supports this conclusion is that the volume of the sample changes.
Submit
As water changes state, the mass of the sample changes.
What happens when water molecules change from liquid to gas?The hydrogen bonds between water molecules completely dissolve when the heat is increased during the boiling process, allowing water molecules to escape into the air as gas.
The potential energy decreases as that of the liquid cools, which causes the molecules to begin to move more slowly. Ice is created when the molecules of water adhere to one another at a temperature of about 0°C. The molecules are still moving despite being in this solid state; we can't see it.
Water's molecular structure never changes, even though it can transition from a liquid state to a solid or gas state and back again.
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A student in a lab measured the mass of 380 ml of regular coca cola and the mass of 380 ml of diet coca cola. He found the mass of regular coca cola to be 384 g, and the mass of diet coca cola to be 370g. What physical property of both drinks can you calculate based on the data obtained in experiment 1?.
The physical property of both drinks that we can calculate based on the data obtained is density
The density formula and the procedure we will use is:
d = m/v
Where:
v= volumed= densitym= massInformation about the problem:
v(regular coca cola)= 380 mlm(regular coca cola)= 384 gv(diet coca cola)= 380 mlm(diet coca cola)=370 gd(diet coca cola)= ?d(regular coca cola)= ?Applying the density formula, we get:
d(regular coca cola) = m(regular coca cola)/v(regular coca cola)
d(regular coca cola) = 384 g / 380 ml
d(regular coca cola) = 1.0105 g/ml
d(diet coca cola) = m(diet coca cola)/v(diet coca cola)
d(diet coca cola) = 370 g / 380 ml
d(diet coca cola) = 0.9737 g/ml
What is density?It is a physical quantity that expresses the ratio of the body mass to the volume it occupies.
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Find the feature not shared by lipids, nucleic acids, and proteins. First exclude the four features that are shared by all three classes of large molecules.
With the exclusion of the first four features that are shared by all three classes of large molecules. They can all form strings of hundreds of repeating monomer units". Option C
This is further explained below.
What is a monomer unit?Generally, A monomer is a molecule that, via a process known as polymerization, may interact with other monomer molecules to produce a longer polymer chain or three-dimensional network.
In conclusion, With the first four characteristics, which are shared by all three types of big molecules, are excluded. Each of them has the ability to create long, repeating monomer unit strings. Choice C
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they can all form strings of hundreds of repeating monomer units".
cq
Find the feature not shared by lipids, nucleic acids, and proteins. First exclude the four features that are shared by all three classes of large molecules.
O They are all based on carbon.
O They are all made from a limited variety of different building blocks. They can all form strings of hundreds of repeating monomer units. OTheir building blocks contains H on one end and OH on the other end. They are all broken down by hydrolysis.
Question
Which atom would be neutral?(
Responses
an oxygen atom with 9 electrons, 8 protons, and 8 neutrons
an oxygen atom with 9 electrons, 8 protons, and 8 neutrons
an oxygen atom with 16 electrons, 18 protons, and 16 neutrons
an oxygen atom with 16 electrons, 18 protons, and 16 neutrons
an oxygen atom with 8 electrons, 8 protons, and 9 neutrons
an oxygen atom with 8 electrons, 8 protons, and 9 neutrons
an oxygen atom with 4 electrons, 6 protons, and 4 neutrons
Answer:
an oxygen atom with 8 electrons, 8 protons, and 9 neutrons
an oxygen atom with 8 electrons, 8 protons, and 9 neutrons
Explanation:
In order for atoms to be neutral, it has to have the same amount of electrons and protons
If 1.50 g of h2c2o4 . 2h2o were heated to drive off the water of hydration, how much anhydrous h2c2o4 would remain?
If 1.50 g of H₂C₂O₄.2H₂O were heated to drive off the water of hydration, 1.071 g of anhydrous H₂C₂O₄ would remain.
The balanced chemical equation of reaction is :
H₂C₂O₄.2H₂O → H₂C₂O₄ + 2H₂O
First calculate the molecular weight of hydrated H₂C₂O₄ -
Using the molecular masses of -
O = 16 g/mol, C = 12 g/mol, and H = 1 g/mol
Total mass of compound = 126 g/mol
Molecular mass of H₂C₂O₄ = 90 g/mol
and, molecular mass of water of hydration = 36 g/mol
The percentage of H₂C₂O₄ in H₂C₂O₄.2H₂O is -
% H₂C₂O₄ = 90 g/mol = 0.714 %
126 g/mol
To calculate remainingIf 1.50 g of H₂C₂O₄.2H₂O were heated to drive off the water of hydration, 1.071 g of anhydrous H₂C₂O₄ would remain.
The balanced chemical equation of reaction is :
H₂C₂O₄.2H₂O → H₂C₂O₄ + 2H₂O
First calculate the molecular weight of hydrated H₂C₂O₄ -
Using the molecular masses of -
O = 16 g/mol, C = 12 g/mol, and H = 1 g/mol
Total mass of compound = 166 g/mol
Molecular mass of H₂C₂O₄ = 126 g/mol
and, molecular mass of water of hydration = 36 g/mol
% H₂C₂O₄ = 126 g/mol = 0.7590
166 g/mol
75.90 % of 1.50 g = 0.714
To calculate remaining amount of anhydrous H₂C₂O₄,
we take percentage of anhydrous H₂C₂O₄ with the mass of hydrous compound which is heated.
71.4% of 1.50 g = 1.071 g
Therefore,
The anhydrous H₂C₂O₄ remaining is 1.071 g.
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Explain what is means when energy is converted
Answer:
Energy conversion is the process of changing one form of energy into another.
.Copper wire is used to transfer electricity.
There are 19.3 grams of gold in one cubic centimeter.
Iron turns to liquid at 1,534.85°C.
Silver is very easy to bend.
Fluorite is a green crystal.
Answer:
What is the question?
Explanation:
This is a answer.
The area of a telescope lens is 6.902x10^3 mm^2 what is the area in square feet. Answer in scientific notation
The area of the telescope lens in square feet (ft²) is 7.429×10⁻² square foot)
Conversion scale92903 square millimeter = 1 square foot
From the question given above, the following data were obtained:
Area (in square millimeter) = 6.902×10³ mm²Area (in square feet) =?We can obtain the area in square feet as illustrated below:
92903 square millimeter = 1 square foot
Therefore,
6.902×10³ square millimeter = (6.902×10³ square millimeter × 1 square foot) / 92903 square millimeter
6.902×10³ square millimeter = 7.429×10⁻² square foot)
Thus, the area of the lens in square foot is 7.429×10⁻² square foot)
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How might the government make sure scientific research is done in an ethical
way?
A. By letting public opinion determine what is ethical in scientific
research
B. By taking away research funds if certain ethical standards are not
met
C. By encouraging scientists to perform within their own ideas of
right and wrong
OD. By allowing scientists to do what they think is best
Answer: By taking away research funds if certain standards are not met
octylphenol ethoxylate is a detergent that is commonly used in chemistry laboratories. it is a thick, yellowish liquid. a chemist dissolves a small amount of octylphenol ethoxylate in a liter of benzene, an organic liquid, then adds a small amount of toluene, another organic liquid. identify each component of the solution as a solute or a solvent. benzene is a toluene is a octylphenol ethoxylate is a
Benzene is a Solvent
Toluene is a Solute
Octylphenol ethoxylate is a Solute
Is benzene considered a solute?
This problem is directly related to an intriguing phenomenon in which a benzene molecule has a negative solvation free energy of -0.87 kcal/mol in ambient water despite being a nonpolar organic solute.Because the pi cloud of the benzene ring can interact with the pi clouds of various solutes, it is more capable of dissolving many organic substances than a saturated hydrocarbon such as hexane. Polystyrene, for example, will be solvated better by benzene than by hexane for this reason.Non-polar solvents such as benzene are used in the production of polymers and plastics, phenol for resins and adhesives, rubber, lubricants, dyes, detergents, drugs, explosives, napalm, and pesticides.Examples of Solvents Solvents commonly used include water, ethanol, methanol, and acetone. A' solvent' is a substance that has the ability to dissolve a given solute in order to form a solution with it.
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Answer:
Benzene is a solvent.
Toluene is a solute.
Octylphenol ethoxylate is a solute.
Explanation:
what four elements does halogen bond with?
fluorine, chlorine, bromine, and iodine,
a sample of an organic compound (a nonelectrolyte) weighing 1.35 g lowered the freezing point of 10.0 g of benzene by 3.66 °c. assuming ideal solution behavior, calculate the molar mass of the compound.
A sample of an organic compound (a nonelectrolyte) weighing 1.35 g lowered the freezing point of 10.0 g of benzene by 3.66 °c. assuming ideal solution behavior molar mass of the compound is 189 g mol⁻¹
Here given data is a sample of an organic compound which is nonelectrolyte and weighing of this compound is 1.35 g lowered the freezing point 0.0 g of benzene by 3.66 °c then we have to find molar mass of the compound=?
So here from the given data the freezing point lowering (ΔTf) is known to be 3.66 °C. also, Kf for benzene can be obtained 11.2 means (Kf = 5.12 °C/m). therefore, the equation ΔTf = Kfm can be used to find the molality of the solution. the definition of molality is moles of solute per kilogram of solvent. by using the mass of the solvent, benzene, the number of moles of solute may be found. using this information with the grams of solute, the molar mass of the organic solute may be found
ΔTf = Kfm
3.66 °C = (5.12 °C/m) × m
M=mole of solute/kg solvent=0.715
Molality=0.715 mol solute/kg solvent=0.715 m
0.715 m=x/0.010 kg benzene
Xmol=0.715 × 0.010=7.15×10⁻³mol solute
Mol=g/molar mass
7.15×10⁻³mol solute=1.350g/molar mass
Molar mass= 189 g mol⁻¹
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protecting against pathogens that have got into the body A.plasmaB.red blood cellsC.white blood cells
Answer: white blood cells
Explanation: they protect you from illnesses and diseases
Which combination of forces in the table below would allow the rocket to launch?
If you add a chunk of zinc to a beaker of acid and zinc shavings to another beaker of acid, the sample with the zinc shavings will react faster. What property causes the increase in rate?.
The property that caused the sample with zinc shavings to react faster than the sample with the chunk of zinc is surface area.
The rate of a reaction is the rate at which reactants form products in a chemical reaction. There are various properties that increase or decrease the rate of reactions, which include temperature, catalyst, surface area and nature of the reaction.
In the question above, the main property that increased the rate of the reaction is surface area. Surface area is the amount of a solid reactant that is exposed. The more the surface area exposed, the faster the reaction.
The beaker of acid with the chunk of zinc is slower, because the zinc has less of its surface area exposed to the acid. In the second sample, reaction takes place on each of the zinc shavings, which will increase the rate at which products are going to form.
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list the first 20 elements with their properties
H - Hydrogen
He - Helium
Li - Lithium
Be - Beryllium
B - Boron
C - Carbon
N - Nitrogen
O - Oxygen
F - Fluorine
Ne - Neon
Na - Sodium
Mg - Magnesium
Al - Aluminum
Si - Silicon
P - Phosphorus
S - Sulfur
Cl - Chlorine
Ar - Argon
K - Potassium
Ca - Calcium
Which of the following represents a pair of isotopes
Considering the definition of isotope and its notation, the correct answer is option B: the pair 12C and 14C is a pair of isotopes.
Definition of atomic numberThe atomic number (Z) is the total number of protons that make up the atomic nucleus of a given chemical element.
Definition of atomic massThe atomic mass (A) is obtained by adding the number of protons and neutrons in a given nucleus of a chemical element.
Definition of isotopeThe same chemical element can be made up of different atoms, that is, their numbers of protons are the same, but the number of neutrons is different. These atoms are called isotopes of the element.
In other words, isotopes of the same element have the same atomic number (Z) but each has a different mass number (A). This indicates that within each chemical element there are several atomic species that differ in their atomic mass.
The isotopes are located in the same place within the Periodic Table.
Isotopes of an element have the same chemical properties but differ somewhat in physical properties because they differ in atomic mass.
The notation of an isotope is given as shown in the attached image.
Pair of isotopes in this caseConsidering the definition of isotope and its notation, the correct answer is option B: the pair 12C and 14C is a pair of isotopes.
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(b) Describe how copper sulfate solution is obtained from the plants used in
phytomining.
Plants are grown in soil that contains low grade ore. the plants absorb metal ions through their roots and concentrate these ions in their cells. the plants are harvested and burnt. the ash left behind contains metal compounds.
I hope this helps :)
take only in consideration the carbon–carbon bond in the molecules. assign the correct orbitals to the molecule groups. (orbitals might be used more than once or not at all).
Carbon bond in the molecules is only taken into consideration, thus assigning the correct orbitals to molecule group, we get the Option A ethylene.
Carbon-Carbon bondA covalent link between two carbon atoms is known as a carbon-carbon bond. The single bond, that is consisted of two electrons—one from each of the two atoms—is the most prevalent type.
One kind of hybridized orbital from each of the carbon atoms are contributing to the formation of the carbon-carbon single bond, which is also known as a sigma bond.
Carbon and carbon have what type of bond?They have an ionic bond
A covalent link involving two C atoms is known as a carbon-carbon bond. The single bond with two electrons—one from each of the two atoms—is the most well-known type.
What four different sorts of bonds can carbon form?A single carbon atom can also make four different kinds of bonds with all the other atoms.
One double bond and two types of single bonds and a total pair of double bonds.
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Complete Question
Take only in consideration the carbon-carbon bond in the molecules. Assign the correct orbitals to the molecule groups. (Orbitals might be used more than once or not at all).
A) Ethylene
B) Ethane
C) Acetylene
The chemical equation below is incorrect.
Zn + HCI ---> ZnCl2 + H₂
O Zn + 2HCI ---> ZnCl2 + H₂
O 2Zn + 2HCI ---> ZnCl2 + H2
O Zn + HCI ---> ZnCl2 + H₂
O 4Zn + 2HCI ---> ZnCl2 + H2
A toy car has an initial velocity of 0m/s and a final velocity of 100m/s. this high speed projectile changes it's velocity in 10 seconds. what was the acceleration of the car? responses
The toy car that had an initial velocity of 0m/s and a final velocity of 100m/s had an acceleration of 10 m/s^2
The formula for Uniformly varied rectilinear motion (UVRM) and procedure we will use to solve this exercise is:
a = (vf - vi) /t
Where:
vf = final velocityvi = initial velocityt = timea = accelerationInformation about the problem:
vi= 0 m/svf= 100 m/st = 10 sa= ?Applying the acceleration formula, we have:
a = (vf - vi) /t
a = ( 100 m/s - 0 m/s) / 10 s
a = 100 m/s / 10 s
a = 10 m/s^2
What is acceleration?It is a physical quantity that indicates the variation of velocity as a function of time, it is expressed in units of distance per time squared e.g.: m/sec^2 ; km/h^2
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