The molality of the toluene is 1.46 mol/kg.
What is molality?The molality of a solution is its molal concentration. Molal concentration is denoted by m. It is the mol of solute dissolves in 1 Kg solvent.
The depression at freezing point is directly proportional to the molality of the solution. The equation we use for this type of problem is:
ΔT=iKm [tex]f_m[/tex]
Where, ΔT [tex]f_m[/tex] is depression at freezing point, i is Van't hoff factor, m is molality and [tex]K_f[/tex] is the freezing point depression constant.
Toluene is a non-electrolyte and so the value of i for this is 1.
Depression at a freezing point is given as -13.[tex]0^0[/tex] and the [tex]K_f[/tex] is given as 5.12. So, we could calculate the molality of the solution using the equation written above.
Let's plug in the values in the equation:
ΔT=iKm[tex]f_m[/tex]
-7.51 =1 x5. 12 xm
m = [tex]\frac{7.51}{5. 12}[/tex]
m = 1.46 m
It means the molality of the solution is 1.46 mol/kg.
Hence, the molality of the solution is 1.46 mol/kg.
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Which property of water helps it maintain a relatively stable temperature?
High specific heat capacity
Low density
Neutral nature
Nonpolar structure
Answer:
High spec heat cap
Explanation:
Specific heat = Q/(m *Tchange)
re-arrange to
Tchange = Heat/(m *spec heat)
this shows that a high spec heat (in the denominator) will require a lot of heat (in the numerator) to change the Temp much
The process that causes a spark to occur when the discharge wand is close to the Van de Graaff generator is similar to the process that causes lightning to form. Use what you have learned about the tendency of potential energy to decrease to try to explain how lightning occurs.
Answer:
Lighter, positively charged particles form at the top of the cloud. Heavier, negatively charged particles sink to the bottom of the cloud. When the positive and negative charges grow large enough, a giant spark - lightning - occurs between the two charges within the cloud.
Explanation:
Lighter, positively charged particles form at the top of the cloud. Heavier, negatively charged particles sink to the bottom of the cloud.
What is a generator?In electricity generation, a generator is a device that converts motive power (mechanical energy) into electric power for use in an external circuit.
Lightning is an electric current. To make this electric current, a cloud is needed.
When the ground is hot, it heats the air above it. This warm air rises. As the air rises, water vapour cools and forms a cloud. When air continues to rise, the cloud gets bigger and bigger. In the tops of the clouds, the temperature is below freezing and the water vapour turns into ice.
Now, the cloud becomes a thundercloud. Lots of small bits of ice bump into each other as they move around. All these collisions cause a build-up of electrical charge.
Eventually, the whole cloud fills up with electrical charges. Lighter, positively charged particles form at the top of the cloud. Heavier, negatively charged particles sink to the bottom of the cloud.
When the positive and negative charges grow large enough, a giant spark - lightning - occurs between the two charges within the cloud. This is like a static electricity sparks you see, but much bigger.
Hence, the positive and negative charges grow large enough, that a giant spark - lightning - occurs between the two charges within the cloud.
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on Part D and E for both of the questions I dont understand what they are asking me.
All they are asking is how much mass of the daughter product is needed and however much of the atomic daughter number. Have a nice day!
What types of elements are involved in the formation of ionic bonds?.
Answer:
Metal and non-metal ions.
Explanation:
Ionic bonds occur between metal and non-metal ions because metals "want" to give up their electrons and non-metals "want" to gain electrons.
Which periodic group of metals is the most reactive.
Answer:
That would be the Alkali metals, and the Alkaline earth metals.
Explanation:
I just did 3.02 periodic table guided notes. np.
Brainliest is appreciated. thx.
-Hailey
A sample of oxygen was collected in a tube over water. in the tube, there is a mixture of oxygen gas and gaseous water (steam). the total pressure of the gas mixture is 760. torr. if the pressure of gaseous water is 23.8 torr, what is the pressure of the pure oxygen? 99.8 torr 736 torr 740. torr 783 torr
Answer:
736 torr.
Explanation:
The combination of fossil fuel use and deforestation has emitted approximately 480 gigatons of carbon over the last century, but the amount of carbon in the atmosphere has only increased by approximately 190 gigatons. About 110 gigatons of this missing carbon went into which reservoir of the carbon cycle?.
About 110 gigatons of this missing carbon went into water reservoir of the carbon cycle.
What is carbon cycle?The biogeochemical cycle in which carbon is exchanged between the biosphere, pedosphere, geosphere, hydrosphere, and atmosphere of the Earth is known as the carbon cycle.
According to the question, emitted amount of carbon is 480 gigatons but the amount of carbon in the environment is approx 190 gigatons, so the remaining amount of the carbon was stoored by the oceans and other water reservoir, which may be get clear throug the attached diagram.
Hence remaining gigatons of carbon went into water reservoir.
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How many moles of water will be produced from the combustion of 0.25 moles of CH3 OH?
Answer: 0.5 mol
Explanation:
i need help pls this isnt chemistry btw i just couldnt find science so i had to put that
Answer: 1. 10% is used to live 30% is stored.
2. an educated guess.
Explanation:
What is the name of the new technology whereby a glass fiber carries as much information as hundreds of copper wires?
Answer:
Fibre optic technology.
Explanation:
Fibre optic technology, as the name implies, uses light pulses to transmit data via strands of glass or plastic. It's the preferred technology for the government's National Broadband Network (NBN), which offers 100Mbps+ download speeds.
Can someone please help me? I will give brainliest:(
Answer D and B i think if imma be honest
Hi!
Can sportive help me with this pls, I’m really bad at chemistry…
I hope someone helps! Have a nice day !
it's 500kg
Explanation:
I did this I hope this helps
What is the force that attracts one water molecule to another water molecule?.
Answer:
hydrogen bonds
Explanation:
If a sample of N2 gas has an initial pressure of 500 Torr and volume of 0.5 L, what will the final volume be if the pressure is increased to 700 Torr?
Answer:
V₂ = 0.4 L
Explanation:
Data:
P₁ (initial pressure) = 500 torrV₁ (initial volume) = 0.5 LP₂ (final pressure) = 700 torrWanted:
V₂ (final volume)Equation:
P₁V₁ = P₂V₂ → V₂ = P₁V₁ / P₂Solution:
V₂ = [tex]\frac{(500 torr)(0.5 L)}{700 torr}[/tex] = 0.3571 L or 0.4 LAt roughly what pressure, p, and temperature, t, will diamond, graphite, and liquid carbon all exist in equilibrium?.
The point where pressure, p, and temperature, t, will diamond, graphite, and liquid carbon all exist in equilibrium is at
P=1*10^5atm
T=4300k
At roughly what pressure, p, and temperature, t, will diamond, graphite, and liquid carbon all exist in equilibrium?.Generally, a situation in which opposing forces or activities are in equilibrium.
In conclusion, For a the cpd graph attached below, we consider the point where the three phases meet and hence consider equilibrum at
P=1*10^5atm
T=4300k
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why does the indicator congo red turn blue?
Distinguish between an acidic and a basic oxide.
(Select all that apply.)
1. In a basic oxide, element forms ionic bonds with oxygen.
2. A basic oxide is an oxide that reacts with bases.
3. A basic oxide is an oxide that reacts with acids.
4. In a basic oxide, element forms covalent bonds with oxygen.
5. An acidic oxide is an oxide that reacts with acids.
6. In an acidic oxide, element forms ionic bonds with oxygen.
7. In an acidic oxide, element forms covalent bonds with oxygen.
8. An acidic oxide is an oxide that reacts with bases.
Answer:
See below ~
Explanation:
Basic oxides
In a basic oxide, element forms ionic bonds with oxygenA basic oxide is an oxide that reacts with basesAcidic oxides
An acidic oxide is an oxide that reacts with acidsIn an acidic oxide, element forms covalent bonds with oxygenDetermine the molarity of a solution formed by dissolving 3.00 moles of NaCl in enough water to yield 4.00 L of solution. 3.00 M 0.750 M 2.00 M 1.33 M 12.00 M
Taking into account the definition of molarity, the molarity of the solution formed by dissolving 3.00 moles of NaCl in enough water to yield 4.00 L of solution is 0.75 [tex]\frac{moles}{liter}[/tex].
Definition of molarityMolar concentration or molarity is a measure of the concentration of a solute in a solution and indicates the number of moles of solute that are dissolved in a given volume.
The molarity of a solution is calculated by dividing the moles of solute by the volume of the solution:
[tex]Molarity=\frac{number of moles}{volume}[/tex]
Molarity is expressed in units [tex]\frac{moles}{liter}[/tex].
Molarity in this caseIn this case, you know:
number of moles= 3 molesvolume= 4 LReplacing in the definition of molarity:
[tex]Molarity=\frac{3 moles}{4 L}[/tex]
Solving:
molarity= 0.75 [tex]\frac{moles}{liter}[/tex]
Finally, the molarity of the solution formed by dissolving 3.00 moles of NaCl in enough water to yield 4.00 L of solution is 0.75 [tex]\frac{moles}{liter}[/tex].
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Write balanced net ionic equations that show the two relevant ionization steps for glycine
What is the solubility of CaCl2 at 20°C
Answer:1,01
Explanation:
what happens when burning matchstick is held near the nitrogen gas jar
Explanation:
No observable change because nitrogen is an inert gas...
Choose a federal law from the list below.
Clean Air Act
Clean Water Act
Endangered Species Act
Pollution Prevention Act
Research the law using the library and other resources. Write a 500 word report describing the law, who or what it protects, and why it was enacted. Be sure to include when the law was first passed, which groups supported it, which groups opposed it, and any recent modifications. Write your report in the essay box below.
The principal law governing pollution of the nation’s surface waters is the Federal Water
Pollution Control Act, or Clean Water Act. Originally enacted in 1948, it was totally revised by
amendments in 1972 that gave the act its current dimensions. The 1972 legislation spelled out
ambitious programs for water quality improvement that have since been expanded and are still
being implemented by industries and municipalities.
This report presents a summary of the law, describing the statute without discussing its
implementation. Other CRS reports discuss implementation, including CRS Report R42883,
Water Quality Issues in the 113th Congress: An Overview, and numerous products cited in that
report.
The Clean Water Act consists of two major parts, one being the provisions which authorize
federal financial assistance for municipal sewage treatment plant construction. The other is the
regulatory requirements that apply to industrial and municipal dischargers. The act has been
termed a technology-forcing statute because of the rigorous demands placed on those who are
regulated by it to achieve higher and higher levels of pollution abatement under deadlines
specified in the law. Early on, emphasis was on controlling discharges of conventional pollutants
(e.g., suspended solids or bacteria that are biodegradable and occur naturally in the aquatic
environment), while control of toxic pollutant discharges has been a key focus of water quality
programs more recently.
Prior to 1987, programs were primarily directed at point source pollution, that is, wastes
discharged by industrial and municipal facilities from discrete sources such as pipes and outfalls.
Amendments to the law in that year authorized measures to address nonpoint source pollution
(runoff from farm lands, forests, construction sites, and urban areas), which is estimated to
represent more than 50% of the nation’s remaining water pollution problems. The act also
prohibits discharge of oil and hazardous substances into U.S. waters.
Under this act, federal jurisdiction is broad, particularly regarding establishment of national
standards or effluent limitations. Certain responsibilities are delegated to the states, and the act
embodies a philosophy of federal-state partnership in which the federal government sets the
agenda and standards for pollution abatement, while states carry out day-to-day activities of
implementation and enforcement.
To achieve its objectives, the act is based on the concept that all discharges into the nation’s
waters are unlawful, unless specifically authorized by a permit, which is the act’s principal
enforcement tool. The law has civil, criminal, and administrative enforcement provisions and also
permits citizen suit enforcement.
Financial assistance for constructing municipal sewage treatment plants and certain other types of
water quality improvements projects is authorized under Title VI. It authorizes grants to capitalize
State Water Pollution Control Revolving Funds, or loan programs. States contribute matching
funds, and under the revolving loan fund concept, monies used for wastewater treatment
construction are repaid to states, to be available for future construction in other communities.
1) How many Joules of energy are released when 75g of water is heated
from 25°C to 99°C? The specific heat of water is 4.18J/g°C?
I
Answer: 23,199 J
Explanation:
Calcium has an atomic number of 20. An atom of calcium has ____ electrons in its first energy level and ____ electrons in its second energy level.
A linkage between two atoms formed by the sharing of electrons, or attraction is called a.
A covalent bond is formed by the sharing of electrons between 2 atoms.
What is a covalent bond?A covalent bond is a chemical bond that involves the sharing of electron pairs between atoms.
Sharing of electrons forms covalent bonds between the atoms.
These bonds are mainly formed between two similar atoms of electronegativity.
Where ionic bonds are formed by sharing electrons where there is an electronegativity difference between metals and non-metals. Ex. NaCl
Hence, a covalent bond is formed by the sharing of electrons between 2 atoms.
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A solid substance turns directly into a gas. Which term describes this change?
deposition
evaporation
melting
sublimation
Answer:
the correct answer would be D. Sublimation
Explanation:
Sublmation- solid transforming into a gas, skipping the liquid stage.
eveporation- a liquid transformimg into a gas
melting- a solid transforming into a liquid
deposition- the opposite of sublimation
hope this helps
Answer:
D) Sublimination
Explanation:
Hello people ~
For which of the following is the Hinsberg approach used?
a) Preparation of primary amines
b) Separation of amine mixtures
c) Preparation of tertiary amines
d) Preparation of secondary amines
Answer:
separation of amine mixtures
Explanation:
There are three types of amines
Primary(1°)Secondary (2°)Tertiary(3°)Hinsberg approach is used distinguish between these amines
Salt and pepper are placed in a jar and the jar is shaken. What has formed?
Answer:
A MIXTURE
Explanation:
No chemical reaction has occurred.... you have just mixed up the two substances togehter.... you have created a MIXTURE
When a Pd-106 nuclide is struck with an alpha particle, a proton is produced along with a new nuclide. What is this new nuclide
When a Pd-106 nuclide is struck with an alpha particle, a proton is produced along with a new nuclide. The new nuclide is Ag-109.
What are alpha particles?Alpha particles (a) are made up of two protons and two neutrons that are tightly bound together.
They are emitted from the nucleus of some radionuclides during alpha decay, a type of radioactive decay.
Thus, the correct option is D, Ag-109.
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Why is the Northern Hemisphere warmer when tilted to the sun?
Answer:
The Sun gives off UV radiation and heat waves, when tilted closer, it is closer to that UV radiation and heat waves.
For example, if you put a heat lamp closer to a rock the rock would get warmer, if you put it further away it would receive less heat therefore making less warmer.