Answer:
See explanation
Explanation:
(a)
From the data provided;
Mass of methanol =11.0 g
Mass of solvent (H2O) =100 g = 0.1 kg
Molar mass of CH3OH =32.04 g/mol
Number of moles of solute = 0.343 mol
molality(m) of methanol = 3.43 m
Also,
Mass of ethanol =22.0 g
Mass of solvent (H2O) =200 g = 0.2 kg
Molar mass of C2H5OH =46.068 g/mol
Number of moles of solute = 0.477 mol
molality(m) of ethanol= 2.38 m
The greater the concentration of a solution, the higher the freezing point of solvent will be depressed. Therefore, higher molality, leader to a greater decrease of the freezing point.
Therefore, the freezing point of methanol CH3OH/H2O is lower than the freezing point of ethanol.
b)
Mass of solvent = 1 kg
Mass of water = 20g or 0.02 Kg
Molar mass of water = 18 gmol-1
Number of moles of solute = 20g/18 gmol-1 = 1.11 moles
Molality= 1.11 moles/1 kg = 1.11 m
Also;
Mass of ethanol = 20 g = 0.02 kg
Mass of solvent = 1.00 Kg
Molar mass of solute = 46 gmol-1
Number of moles of solute = 20g/ 46 gmol-1 = 0.43 moles
Molality= 0.43 moles/ 1 kg = 0.43 m
The greater the concentration of a solution, the higher the freezing point of solvent will be depressed. Therefore, higher molality, leader to a greater decrease of the freezing point.
Therefore, the freezing point of water H2O/CH3OH is lower than the freezing point of ethanol.
Because a gas has no definite volume or shape, in what way does it take up space? (2 points)
Group of answer choices
By taking the volume of a solid
By taking the volume of a liquid
By taking the shape of its container
By taking the volume of its container
Answer:
By taking the volume of the container.
Answer:
By taking the volume of the container
Explanation:
it does not have any specific volume or shape, so the way it volume is the volume of container.
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If you were running an experiment to determine the temperature at which beans sprouted (germinated) the fastest, what would be the outcome (dependent variable)?
Answer:
Temperature on beans sprouted
Explanation:
The variable amount is the amount that changes continuously. We calculate the sprout of the bean at which temperature it is sprouting rapid, in that case, the temperature acts as a variable amount.What is another name for Group 6A? O A. Group A6 O B. Group 6B O C. Group 16 D. Group 6
Answer: group 16
Explanation: apex
how is the caloric value of a food sample determined?
A food sample's caloric value is calculated. By dividing the total weight throughout grams of a particular food by the nutritionists' calculated energy values.
What is calorie?The calorie is an amount of energy that derives from the outmoded caloric concept of heat. Two primary interpretations of "calorie" are frequently used due to historical factors.
The quantity of energy needed to elevate the temperature from one water molecule through one degree Celsius is known as a big calorie, food caloric intake, dietary calorie, simply kilogram calorie. A food sample's caloric value is calculated. By dividing the total weight throughout grams of a particular food by the nutritionists' calculated energy values.
Therefore, a food sample's caloric value is calculated. By dividing the total weight throughout grams of a particular food by the nutritionists' calculated energy values.
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what would happen to the solvent if a reaction was refluxed without a condenser
Answer:
Solvent will be lost as gas and not return into the vessel via condensation.
Explanation:
Reflux is a technique used in chemistry to boil a particular solvent and convert the gas formed back into liquid by condensation. This technique allows a solvent to be heated at a regulated temperature but for a prolonged period of time than it would normally take place.
The reflux procedure makes use of a reflux CONDENSER, which is an apparatus that allows vapour from the heating/boiling to flow back into the reaction vessel. The CONDENSER functions to prevent the loss of the SOLVENT as vapour by providing a cooling effect on the vapour.
Therefore, if a reaction was refluxed without a condenser, THE SOLVENT WILL BE LOST AS VAPOUR
what is the strength of alloys and what is the solubility of alloys please answer this simple question within 12 hours will mark brainliest for sure
Answer:Features very high tensile strength and toughness. Titanium alloys are light in weight, have superior corrosion resistance properties and can withstand extreme temperatures. ... Titanium alloys are heat-treated to increase their strength in terms of fracture toughness, fatigue strength and high temperature strength.35 grams is the sollubility.
Explanation:
An aluminum cylinder has a radius of 3.2 cm and a length of 8.6 cm. What is the mass of the aluminum cylinder if aluminum has a density of 2.7 g/cm3?
please help :)
Answer:
750g of Aluminum
Assuming 8.6 cm lenth is the height of the cylinder. The volume of a cylinder is: V = [tex]\pi[/tex]*r^2*h
V = 3.14cm x 10.24cm x 3.6cm
V = 280cm^3
Now density = mass/volume
2.7g/cm^3 = mass/280cm^3
2.7g/cm^3 x 280cm^3 = mass/280cm^3 x 280cm^3
= 750g of Aluminum
You have an atom with a mass number of 100 with 85 neutrons. What is this
element?
Answer:
phosphorus i believe
Explanation:
in order to find the atomic number you minus the mass number from number of neutrons then just look it up in a periodic table
The mass number of the atom is 100 and number of neutrons is 85. Then, number of protons is 15. Then, element with 15 protons and 15 electrons is phosphorous.
What is mass number ?An atom is composed of subatomic particles electrons, protons and neutrons. Protons and neutrons are located inside the nucleus. The mass number of an atom is sum of number of protons and neutrons.
The number of electrons in an atom in its neutral state is called its atomic number. In a neutral atom, the number of electrons and proton are the same.
Give the mass number = 100
no.of neutrons = 85
no.of protons = 100 -85 =15
no.of electron = 15
Thus, atomic number = 15.
The element with atomic number of 15 is phosphorous (P).
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What is the term for a solution that is holding more dissolved solute than it should be able to at a particular temperature?
Explanation:
Sometimes, a solution contains more dissolved solute than is normally possible. This type of solution is said to be supersaturated. A saturated solution can become supersaturated if more solute is added while the temperature is raised.
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For a trip to the Moon, a rocket must lift off from
Earth's surface. Suppose it takes 5 minutes for the
rocket to reach a velocity of 6,000 m/s upward from
a starting velocity of 0 m/s. What is the rocket's
acceleration?
Answer:
20 m/s^2
Explanation:
given,
final velocity (v) = 6000m/s
initial velocity (u) = 0m/s
time taken (t) = 5 minutes
= 5×60second
= 300second
acceleration(a) = ?
we know that,
a = (v-u)/t
= (6000-0)/300
= 20 m/s^2
Which is most reactive toward electrophilic aromatic substitution?
Complete Question
Which is most reactive toward electrophilic aromatic substitution?
A Phenol
B Anisole
C Nitro-benzene
D Benzene
Answer:
The correct option is A
Explanation:
Generally the rate at which electrophilic aromatic substitution reaction occur is dependent on the nucleophilicity(nucleophile strength ) of Benzene ring.Now a functional group which increase the electron density in the benzene ring when attached to it increases its nucleophilicity and this in-turn will increase the rate at which electrophilic aromatic substitution reaction occur
Now Phenol is a compound that is made up of OH functional group and then the benzene ring
Anisole is a compound that is made up of [tex]OCH_3[/tex] functional group and then the benzene ring
Nitro-benzene is a compound that is made up of [tex]NO_2[/tex] functional group and then the benzene ring
Now since OH is the highest In series of activating group compared to the activation groups we are considering (i.e [tex]OCH_3[/tex] and [tex]NO_2[/tex] )
Then Phenol is the answer
Enzymes which are usually increase the rate of a reaction by________.
6.(01.05 LC) Which states of matter change shape when moved?(2 points) Gases and solids Liquids and gases Liquids, solids, and gases Solids and liquids
Answer:Gases and solids , Solids and liquids
Explanation:
A solid has a definite shape while liquids and gases take the shape of the container in which they are found .
Hence when a substance changes it's state from gas to solid or solid to liquid, it's shape automatically changes as explained above.
11.In 13C NMR spectroscopy, the signal due to this type of carbon occurs furthest downfield.A)–CºNB)C)D)E)–CºC–
Answer:
C=O
Explanation:
The nuclear magnetic resonance (NMR) spectroscopy is a method that employs the technique to observe the local magnetic fields are atoms. This analytical technique exploits sufficient differences in the frequency of nuclear magnetic resonance in protons and atoms within organic compounds that depend on their neighboring atoms.
Amongst all the given options, the carbonyl is the right option because the carbon is doubly bonded to the oxygen and the hybridization of this double bond is sp² hybridized, as a result, the electron density at the carbon possess a lower amount in order to have more magnetic field.
The increasing order of these chemical shifts are as follows:
C - X < [tex]\mathbf{C -O }[/tex]≅[tex]\mathbf{ \mathrm{-C\equiv C-}}}[/tex] < -C≡N < C=O
The elements carbon, hydrogen, oxygen, and nitrogen make up which percentage of the human body?
Answer:
96% Hope it helps
Explanation:
Roughly 96% of the mass of the human body is made up of just four elements: oxygen, carbon, hydrogen and nitrogen, with a lot of that in the form of water. The remaining 4% is a sparse sampling of the periodic table of elements.
Which of the following is true concerning y? A) wdescribes the probability of finding an electron in space. B) ya describes the exact path of electron motion in an orbital. C) w? describes the electronic structure of the atom according to the Bohr model. D) w describes the exact volume of an atom. E) w2 describes the size of an atom.
Answer:
wdescribes the probability of finding an electron in space.
Explanation:
The quantum mechanical model of the atom assigns wave properties to the electron. This is in accordance with Heisenberg's uncertainty principle.
The probability of finding the electron in a given volume element is given as the square of the wave function while the wave function itself does not really have a physically significant meaning.
However, the wave function is a mathematical function that contains a detailed information about the behavior of an electron.
What has 2 protons and 2 neutrons in the center of the atom
Answer:
HELIUM
Explanation:
HELIUM HAS 2 PROTON I
Brian's aunt has cats. When Brian recently visited her, he started sneezing badly and believes that it was because
he is allergic to cats.
What would be the next step for Brian to form a hypothesis?
O by avoiding going to his aunt's house
by wearing a nose mask near cats
by visiting other households with cats
O by visiting his aunt's house again with the cats outside
Answer:
By visiting other households with cats.
Explanation:
This will give Brian a variety of other houses and determine if it is truly cats or just alleries from other items. This is the most direct way to get Brian the answer he is looking for.
Answer:
c
Explanation:
i just did it
Select the words that correctly complete the sentences. A class uses 10 students to model a lithium atom. Each student represents a particle in the atom. Three students wear signs with a “+” sign, representing (electrons / neutrons / protons). The four students with “0” signs represent (neutrons / protons / electrons ). Each of the remaining students wear a “–” sign, representing (protons / electrons / neutrons)
Answer:
Explanation:
Protons.
Electrons.
Neutrons.
I hope I helped you! :)
Which process results in two identical cells?
O meiosis
O replication
O fertilization
O mitosis
May u please help i mark brainlist ! :D
Answer:
fertilization i think
Explanation:
because during fertilization process two identicle cell divisions takes place
Answer:
fertilization
Explanation:
edgenuity
13. Adding up all of the
of all of the individual atoms within one molecule of a compound will determine the molecular mass of the compound.
A. atomic numbers
B. electrons
C. atomic masses
D. protons
Which action changes the identity of substance referenced
Answer:
When iron turns to rust, the chemical identity of the iron changes. When you break ice, the ice is still ice
Use the clues you highlighted to choose the best
meaning of beat in this sentence.
Highlight the context clues that help you choose
the best meaning of the word beat.
Our family beat a retreat back to the sofa as if chased by
enemy soldiers
- "The All-American Slurp."
Lensey Namioka
O defeated
O mixed
hurried
musical rhythm
Answer:
hurried
Explanation:
because they retreated back to the couch so hurried.
Answer:
c
Explanation:
The element X has three naturally occurring isotopes. The isotopic masses (amu) and % abundances of the isotopes are given in the table below. Calculate the average atomic mass of the element in amu. PLEASE HELP ASAP
Answer:
162.349
Explanation:
(.3060 * 159.37) + (.1579 * 162.79) + (.5361 * 163.92) = 162.349
The two forces acting on a boat or some other floating object are________
and gravity.
Answer:
buoyancy. ...
Explanation:
........
Answer:
buoyancy
Explanation:
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Which of the following are false about Prokaryotic Transcription termination?
A. It can occur in a factor dependent fashion.
B. It can occur in a factor independent fashion.
C. It may involve Rho protein.
D. none of the above.
Answer: none of the above
Explanation:
In Prokaryotic Transcription termination, it should be noted that the RNA polymerase transcribes through a terminator sequence, which in turn results in the polymerase to be separated from the DNA and thereby leads to its release of the transcrip.
Prokaryotic Transcription termination can occur in a factor dependent fashion, can occur in a factor independent fashion and may involve Rho protein.
Therefore, none of the options is false.
the atomic mass of the isotope copper-__ is 62.930 amu
We have that The isotope of copper with the atomic mass of the isotope copper 62.930 amu is Cu 63
Cu 63
From the question we are told
the atomic mass of the isotope copper-__ is 62.930 amu
Generally
Copper is the 29th element of the the periodic table with an atomic mass of 29.
Copper as an elementt has 2 stable isotopes which are
Cu 63
Cu 65
Therefore
The isotope of copper with the atomic mass of the isotope copper 62.930 amu is Cu 63
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Why does burned toast taste so bad? Is it a chemical or physical change?
Because things that are burnt have been changed into something else like moldy bread thats cooked.
It is chemical change because you cannot unburn something.
Answer:
It's a chemical change because I'm really good at answers
Explanation:
Not divisible
O atom
O compound
O mixture
O solution
Answer:
mixture or atom
Explanation:
I HOPE IT WILL HELP YOU
Explanation:
and ,answer is mixture.
what is Corona virus And explain breifly in
Answer:
it is a viral disease . it is infected by one person to other .