Answer:
The amount of heat that must be added to raise the temperature of 1.90 mol of air from 18.0 ° C to 37.0 ° C at constant volume is 749. 9775 J
Explanation:
The properties cv and cp are called specific heats (or heat capacities) because, under certain special conditions, they relate the change in temperature of a system to the amount of energy added by heat transfer. Its SI units are [tex]\frac{J}{kg K}[/tex] or [tex]\frac{J}{mol K}[/tex]. Two specific heats are defined for gases, one for constant volume (cv) and the other for constant pressure (cp).
In the case of constant volume heating, the amount of heat entering the gas is equal to
Q=Cv*n*(Tfinal - Tinitial)
In this case:
Air, being considered a diatomic gas, will have a molar heat capacity of: [tex]Cv=\frac{5}{2}R[/tex] where R is the general gas constant, whose value in this case will be [tex]R= 8.31 \frac{J}{mol K}[/tex]n=1.90 molTfinal= 37 °CTinitial= 18 °CReplacing:
[tex]Q=\frac{5}{2} *8.31 \frac{J}{mol K} *1.90 mol* (37 - 18)[/tex]
Taking into account that the difference in degrees kelvin is equal to the difference in degrees Celsius, and solving you get:
[tex]Q=\frac{5}{2} *8.31 \frac{J}{mol K} *1.90 mol* 19 K[/tex]
Q= 749. 9775 J
The amount of heat that must be added to raise the temperature of 1.90 mol of air from 18.0 ° C to 37.0 ° C at constant volume is 749. 9775 J
Japanese scientists accidentally invented a way for ice cream to not melt by the power of polyphenols from strawberries. I want to know: Can eating too much ice cream that contains polyphenols kill you? Is it safe to eat too much?
Answer:
Japanese is educated place so they invent those things which are really good and helpful...
in my opinion it is safe....
Express this number in scientific notation 50000
Answer:
We write 50,000 in scientific notation,
it is written as 5 x 10⁴.
Hope it helps.
Answer: 5×10^4
Explanation:
scientific notation: a×10^b, where should be 0<a<10
Step 1. Count the zeros
There are in total 4 zeros in 50000, so we write the exponent as 10^4
Step 2. Look at the number left
The number left is 5, which technically should be the [a] in the expression. But first, we need to check whether or not is it in the proper range of [a].
0<5<10, is it true? YES
So the final expression should be 5×10^4
Hope this helps!! :)
Please let me know if you have any question
Why do our hair become grey?
Answer:
As humans, we have melanin in our hair but as we grow the pigment cells in our hair follicles gradually die. When there are fewer pigment cells in a hair follicle become a more transparent color. Our hair goes through its natural cycle of dying and regenerating, it’s more likely to grow in as gray after the age of 35. Stress can sometimes speed it up
Explanation:
Answer:
As we get older, the pigment cells in our hair follicles gradually die. When there are fewer pigment cells in a hair follicle, that strand of hair will no longer contain as much melanin and will become a more transparent color — like gray, silver, or white — as it grows.
A guy swam a 50 meter freestyle in 21.93 seconds. How fast is this in miles per hour?
Answer:
Speed = 5.107 mile/hrExplanation:
Given:distance =50m = 0.0311 mile
Time= 21.93 seconds/3600 =0.00609 hour
Speed=?
Speed= Distance / Time = 0.0311 / 0.00609 = 5.107 mile/hrI need help please help me
chemical potential energy, thermal energy, electrical energy, sound energy
Explanation:
the coal is chemical potential energy because it is just sitting there, the coal fueled power plant is thermal energy because it is using the heat from the coal to work the power plant, that is then turned into electrical energy, which then goes to the radio which displays sound energy
pls give brainliest5) How many kilograms are in 185.6 lbs?
Answer:
84.1 Kilograms
Explanation:
A weightlifter can lift 495 lbs. How many kg is that? Please provide a step-by-step procedure.
Answer:
Explanation:
2.2 pounds = 1 kg
495 pounds = x
2.2/495 = 1/x Cross multiply
2.2*x = 495 * 1 Divide by 2.2
2.2x/2.2 = 495/2.2
x = 225 kg
chloride gas is usually collected by downward delivery after preparation because chlorine gas is
A. soluble in water
B. denser than water
c. less dense than air
d. very reactive
Which of the following samples would be the most compressible?
C6H12O6 (s)
CO2 (g)
NaCl (aq)
H2O (l)
Answer:
CO2 (g)
Explanation:
In solids the interatomic or intermolecular space is least . It is most pronounced in gases . That is why inter molecular or interatomic attraction is least in gases . That is why gas flows .
Hence , when we try to compress a gas , due to inter molecular space , it is most likely to get compressed . It will be least compressed when we try to compress a solid because of lack of intermolecular space .
Is atomic mass and molar mass same?
Answer:
Atomic mass is the mass of an atom and is given in a.m.u. (atomic mass unit).
Explanation:
Atomic mass is the mass of an atom and is given in a.m.u. (atomic mass unit). However, a molar mass is the mass of one mole atoms or molecules and is given in grams. Sodium atom has a mass of 23 a.m.u. however, the molar mass of sodium is 23g/mol.
What do you think plasma looks like on the molecular level?
Answer:
At the molecular level, the plasma only lets us see ions and electrons released.
Explanation:
Plasma is the fourth state of matter.
A state similar to gas, but with the difference that it does not have an electromagnetic equilibrium. It also has no defined mass or volume unless it is placed in a closed container.
Water in solid-state: A mesh style is seen where its components obtain more attraction force.
But on the other hand, in the plasma something well defined is not seen, since due to the high temperature its molecules give off electrons, leaving only ions and electrons around.
Select the correct answer. Which quantity is a graduated cylinder designed for measuring? A. length B. mass C. temperature D. time E. volume
what is five plus forty five
Answer:
5+ 45 = 50 is the answer....
Answer:
55. I hope this helps you!
Why do you think the "super-hot" Earth's core is important in this
whole process? I need help! For science!!!:)
The "super-hot" earth's core is important because it generates the magnetic field around the earth. it also helps control evolution.
what simply states what will be observed and always true but does not explain why
Answer:
A Law
Explanation:
A scientific law talks about a law which has been observed and found to be always true but does not explain the reason behind it or the underlying causes which makes such an event to occur.
For example the law of conservation of energy states that energy can neither be created or destroyed, but can be converted from one form to another or transferred from one object to another.
In this law there is no reason why this happens and doesn’t state the causative factors.
what is the Newton's second law?explain.
7)If a lab experiment is not completed, you should
O A discuss the jesue with your instructor.
w
O B. sneak in after school and work alone.
O C. come in during lunch and finish while eating lunch.
O D. make up some results.
Answer:
A. discuss the issue with your instructor.
Explanation:
If a lab experiment is not completed then one should discuss it with their instructor because instructor guides how to perform the experiment and also gives instructions to avoid any mis-happening during experiment.
No one should perform any experiment without their instructor in school or college as it can be dangerous to experiment with chemicals or other experimental devices without any supervision.
Hence, the correct option is "A".
Question 6
6. Ozone protects living organisms from damaging UVB rays.
True
False
Answer:
True
Explanation:
Ozone protects living organisms from damaging UVB rays
Answer:
A: True
Explanation:
The ozone layer acts as an invisible shield and protects us from harmful ultraviolet (UV) radiation from the sun.
Does covalency fail in explaining the formation of BeCl2 and PCl5? Explain
Answer:
Yes , covalency fails to explain the formation of BeCl₂ and PCl₅.
Explanation:
covalent bonds are formed between two atoms by sharing of outermost electrons in order to attain octet for attaining stability . To octet means to attain 8 electrons in their outermost orbit .
BeCl₂ :
Be has two electrons in its outermost orbit and each of Cl has 7 electrons .
Each of Cl shares one electron each with each of two electrons of Be . Cl atoms attain 8 electrons as octet . But Be attains only 4 electrons ( 2 of Be and 2 from Cl atoms ) . Hence octet of Be is not attained . So covalency fails in the formation of BeCl₂ .
PCl₅ :
P has 5 electrons in the outermost orbit . Each of these electrons shares with one electron from each of Cl atoms . Thus Cl attains octel state ( 8 electrons ) but P attains 10 electrons ( 5 + 5 ) , 5 of P and 5 from 5 Cl atoms .
Hence Octet of P is not attained . Hence covalency fails in the formation of PCl₅ .
The braking distance of the car represents which variable?
A-dependent
B-independent
C-control
Answer:
b
Explanation: i did the quiz
Answer:
Explanation:i’m not sure.
Fill in the SI unit for each of the following measurements. 1: Time: ___ 2. Length:___ 3. Mass:___ 4. Temperature___
the si unit for time is second
the si unir for length is meter
the si unit for mass is kilogram
the si unit for temperature is kelvin
1: Time: second 2. Length: meter 3. Mass: kilogram 4. Temperature kelvin are the SI units of measurements.
What do you mean by SI unit of measurements?
It is unit of the standard of reference which is chosen to measure any type of physical quantity.
SI Units of Measurements is the system which stands for the international system of unit.
The SI, uses standard symbols, units and abbreviations, developed by the Bureau International.
The SI unit of mass is the kilogram, length is a meter, time is second, temperature is kelvin, electric current is ampere, amount of substance is mole, luminous intensity is candela.
SI unit has a huge amount of application universally in both technical and scientific research to avoid the confusion.
This system is important as it helps the entire world to understand the measurements in one set of unit systems.
Learn more about SI unit, here:
https://brainly.com/question/12750330
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5.22x10-^3 = [? ]x 10-2
Answer:
5.22 x 10^-5
Explanation:
5.22 x 10^-3 x 10^-2 = 5.22 x 10^-5
What evidence do you see that a chemical reaction is taking place when you add hydrogen peroxide to potassium ioxide??
Answer:
Bubbling/Foaming
Heat is produced
Explanation:
A chemical reaction has occurred if
1. There is a change in colour
2. Formation of a precipitate
3. Formation of a gas
4. Change in temperature
5. Change of smell
In the reaction of hydrogen peroxide and potassium iodide, the solution quickly rises which shows the formation of gas. This means it is a chemical reaction.
The beaker/test tube/whatever you used should also become warm because it is an exothermic reaction. This means its a chemical reaction
Answer in the correct significant figures: 19.117 - 8.110
Answer:
11.007
Explanation:
that is the answer
What is a change of a substance from one form to another without changing its composition called? (1 point) A. Atomic Change B. Chemical Change C. Molecular Change D. Physical Change
Answer:
D. Physical Change
plastics are used to make electrical wires. Explain
Answer:
Plastic is a insulator that is why it is used
Explanation:
So wires or metal is a conductor and if you put a conductor as coating then it will conduct plastic coating is for protection because it does not conduct electricity or let it pass through that is why you don't get shocked but if coating was metal then it would conduct and you would get shocked.
Answer:
plastics don't conduct any electricity whatsoever, so plastic is actually used in a wide variety of applications where their insulating, or "protecting" properties are needed. PVC is the most common insulator for electric wiring, I know, because my dad's friend works in electrical and that's what he mainly uses in his line of work, but anyway. yeah, so, plastic materials such as PVC also helps with the prevention of electrical shock. obviously if you were to touch a bare electrical wire you would either be in for a long hospital stay or a coffin. lol um so yeah materials such as PVC are very good and are always used in electrical wiring to not only prevent electrical shock, but to also to provide an insulator and is good for use in high temperatures.
~hope i helped uwu n have a nice rest of ur day~
lots of love,
lee
A solid object is 75.5 g in mass and has a volume of 13.25 cm^3. What is its density?
5,7 g/cm³
Explanation:d = m/V
= 75.5g/13.25cm³
≈ 5,7 g/cm³
The force that develops when two solutions, each with a different concentration of solutes, are separated by a semipermeable membrane is:________
a. systolic pressure
b. diastolic pressure
c. osmotic pressure
d. atmospheric pressure
Answer:
The correct answer is option c, that is, osmotic pressure.
Explanation:
The development of the force, which takes place when two solutions exhibiting distinct solute concentrations are distinguished by a semipermeable membrane is known as osmotic pressure. It is the least pressure that is required to be imparted to a solution to inhibit the inward pure solvent flow through a semipermeable membrane.
The flow of solvent molecules via a semipermeable membrane to a region of high solute concentration from a region of low solute concentration, until attainment of equilibrium, is done is termed as osmosis.
what type of mixtures can be seperated by using fractional distillation? Give any two examples
Answer:
liquid ethanol can be separated from a mixture of ethanol and water by fractional distillation and separation of various components of crude oil. This method works because the liquids in the mixture have different boiling points.
Explanation:
please give 5 star
What letter on the graph corresponds to only liquid water
Answer:
What letter on the graph corresponds to both liquid water and steam? D
Explanation:
Liquid water exists between 0 and IOO degrees Celcius.