Some students believe that teachers are full of hot air. If I inhale 2.1 liters of gas at a temperature of 200 C and it heats to a temperature of 370 C in my lungs, what is the new volume of the gas?
Answers
Answer:
2.86L
Explanation:
Given parameters:
V1 = 2.1L
T1 = 200°C = 200 + 273 = 473K
T 2 = 370°C = 370 + 273 = 643K
Unknown:
V2 = ?
Solution:
Since pressure is constant, we apply the Charles's law;
\(\frac{V1}{T1}\) = \(\frac{V2}{T2}\)
V is volume
T is the temperature
1 is the initial state
2 is the new state
\(\frac{2.1}{473}\) = \(\frac{V2}{643}\)
V2 = 2.86L
Related Questions
What can help overcome a positive enthalpy of solution and allow a solid
solute to dissolve in water?
A. A decrease in entropy
B. A large amount of energy released
C. A large amount of energy absorbed
D. An increase in entropy
Answers
Answer: D. An increase in entropy
Explanation:
Entropy is the measure of randomness or disorder of a system. If a system moves from an disordered arrangement to an ordered arrangement, the entropy is said to increase and vice versa.
For a reaction to be spontaneous, the enthalpy of the solution must decrease and the entropy must increase.
To overcome a positive enthalpy of solution and allow a solid solute to dissolve in water, an increase in entropy would make the reaction spontaneous as the system would move to a more disordered state.
Must all species reproduce in order for the species to survive? *
Answers
Answer:
no
Explanation:
It is required to make 20 grams of certain chemical compound called z. This is made from compounds w, x, and y in the ratio of 2:1:3. The compound y is itself made from w and x. To make 6 grams of y requires 4 grams of w and 2 grams of x. How much w and x is required to make the required amount of z.
Answers
9.32 grams of W and 4.66 grams of X are required to make the required amount of z.
What is a compound?
A compound is a material created by the chemical joining of two or more distinct components. Examples of compounds are table salt (NaCl), which is formed of the elements sodium and chloride, and water (H2O), which is made of the elements hydrogen and oxygen.
Given;
Mass of Z = 14 grams
W:X:Y = 2:1:3
4 grams of W and 2 grams of X are required to make 6 grams of Y
W:X = 4:2 = 2:1
Substituting the composition of Y to Z
Z = W:X:Y = 2:1:3
We have;
Z = W:X = 4:2 = 2:1
The final mixing ratio for W and X are 2:1,
To make 14 grams of Z, we need;
W = 2/3 × 14grams = 28/3 grams
W = 9.33 grams
X = 1/3 × 14grams = 14/3 grams
X = 4.67 grams
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The sample on the right was submitted for PT and aPTT assays. All of the following are reasons why the specimen is unacceptable EXCEPT:
a) Heparin or warfarin monitoring may be inaccurate if this specimen is used
b) The clotting times will be erroneously shortened if this specimen were used
c) The ratio of whole blood to citrate buffer is less than 9:1
d) There is an excess of citrate buffer relative to plasma
e) None of the above. The specimen is acceptable
Answers
The correct answer is e) None of the above. The specimen is acceptable.
Based on the given options, all of them provide reasons why the specimen would be unacceptable, except for option e. Therefore, if none of the above reasons apply, it means the specimen is acceptable.
how would your calculations of the concentration of [fescn]2 been affected if the cuvette you used had a 1.5 cm path length rather than the 1.0 cm value you were told to use?
Answers
The increased distance across the cell will result in an increase absorbance reading.
The concentration of \([Fescn]_2\) would be affected if the cuvette had a 1.5 cm path length rather than the 1.0 cm value used.Since the absorbance of a sample is proportional to the concentration of a sample (as described by the Beer-Lambert law), increasing the path length of the cuvette would result in a decrease in absorbance. This means that the concentration of the sample would be lower than if the 1 cm path length was used. In other words, the concentration of \([Fescn]_2\)would be lower if the cuvette had a 1.5 cm path length than if it had a 1.0 cm path length.
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the number of electrons in a neutral atom is equal to the number of protons? True or false
Answers
Answer:
true
Explanation:
in order for the atom to be neutral the number of protons and electrons have to be the same.
Qu 4.
How many protons, neutrons, and electrons are present in an atom of gold, Au,
with a mass number of 197?
197 protons, 276 neutrons, 79 electrons
79 protons, 118 neutrons, 79 electrons
Du Do
79 protons, 197 neutrons, 118 electrons
&
118 protons, 72 neutrons, 118 electrons
Answers
Answer:
It's the second one down.
Explanation:
Gold
Mass 197
Number of Protons: 79
Number of Neutrons: 197 - 79 = 118
Number of electrons: = number of protons = 97
If a solution with molarity of 4.5 and volume of 1.7 is diluted so that the new volume is 1.2, what is the new molarity?
Answers
The new molarity after dilution is approximately 6.375.
What is molarity ?The amount of a solution is gauged by its molarity. It is described as the quantity of solute in a solution measured in moles per liter. M represents molarity in a symbol.
The dilution equation is as follows:
\(M^1V^1 = M^2V^2\)
Where
\(M^1\) is the initial molarity \(V^1\) is the initial volume \(M^2\) is the final molarity\(V^2\) is the final volumeSubstituting the given values, we get:
\(M^1 = 4.5 MV^1 = 1.7 LV^2 = 1.2 LM^2 = ?\)
Using the equation for dilution, we can solve for M2:
\(M^1V^1 = M^2V^2\)
4.5 M × 1.7 L =\(M^2\) × 1.2 L
7.65 = 1.2\(M^2\)
\(M^2\) = 7.65 / 1.2
\(M^2\)= 6.375 M
Therefore, the new molarity after dilution is approximately 6.375.
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PLEASE ANSWER QUICK! 50 POINTS!!!!
How does the structure of amino acids allow them to form a polypeptide?
Options:
A. Each amino acid has an amino group and a carboxyl group.
B. Each amino acid has a hydrogen atom and a carboxyl group.
C. Each amino acid has a carboxyl group and an R group.
D. Each amino acid has an R group and a hydrogen atom.
Answers
Answer:
A. Each amino acid has an amino group and a carboxyl group.
Answer:a
Explanation:
C2H6(g) + O2(g) → CO2(g) + H2O(g)
Answers
Answer:
2C2H6 + 7O2 --> 4CO2 + 6H20
Explanation:
Balanced equation
how long must a constant current of 50.0 a be passed through an electrolytic cell containing aqueous cu2 ions to produce 3.50 moles of copper metal? how long must a constant current of 50.0 a be passed through an electrolytic cell containing aqueous cu2 ions to produce 3.50 moles of copper metal? 3.75 hours 1.88 hours 0.533 hours 0.267 hours
Answers
Answer:6
Explanation:
___is the transfer of heat through the movement of a fluid such as water or air.
Answers
Answer:
Convection
is the movement of heat by a fluid such as water or air. The fluid (liquid or gas) moves from one location to another, transferring heat along with it. This movement of a mass of heated water or air is called a current. Radiation is the transfer of heat by electromagnetic waves.
colors seen on the surface of gasoline are primarily the result of
Answers
The colors seen on the surface of gasoline are primarily the result of a phenomenon called thin-film interference. This occurs when light waves reflect off both the top and bottom surfaces of the thin gasoline layer, causing the reflected waves to interfere with each other.
The resulting chemical colors depend on the thickness of the gasoline film and the angle at which the light is observed.
The colors seen on the surface of gasoline are primarily the result of thin-film interference. When light enters the surface of gasoline, some of it is reflected off the top of the liquid, while some of it enters the liquid and reflects off the bottom surface of the liquid. These two waves of light can interfere with each other, causing some wavelengths of light to cancel out while others reinforce. This interference produces the characteristic rainbow-like colors seen on the surface of gasoline. The exact colors seen can depend on a variety of factors, including the thickness of the liquid, the angle of incidence of the light, and the composition of the gasoline.
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What is the amount of space occupied by a sample of matter
Answers
The amount of space that matter occupies is called its volume. Solids, liquids, and gases all have volume.
What is KOH in the dehydrohalogenation of 2-bromobutane reaction?
Answers
KOH is the base used in the dehydrohalogenation of 2-bromobutane reaction. The reaction of dehydrohalogenation of 2-bromobutane with KOH as a base leads to the formation of 2-butene. The reaction mechanism follows the E2 mechanism which involves the removal of a proton and a halide ion from the substrate simultaneously in a single
step.The reaction can be represented as follows:CH3CHBrCH2CH2Br + KOH → CH3CH=CHCH3 + KBr + H2OHere, KOH acts as a base and accepts a proton from the carbon adjacent to the bromine atom leading to the formation of an
alkene. The halide ion (Br-) leaving from the substrate simultaneously removes a proton from the adjacent carbon.The E2 mechanism is a second-order elimination reaction that follows the "bimolecular elimination" reaction mechanism. It
is a concerted reaction where the reaction occurs in a single step without any intermediates being formed.
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All matter has both physical and chemical properties.
True or False
Answers
Answer:
F
Explanation:
Why is it important for scientists to use the scientific method?
A. Scientists would not ask questions if the scientific method were
not used.
B. Experiments would not produce any data without the scientific
method.
C. The scientific method helps scientists get accurate, repeatable
results,
D. Using the scientific method means that the results will support the
hypothesis
Answers
Explanation:
It provides an objective, standardized approach to conducting experiments and, in doing so, improves their results. By using a standardized approach in their investigations, scientists can feel confident that they will stick to the facts and limit the influence of personal, preconceived notions.
I hope this helps you out!
A car of 1200 kg is moving with a speed of 36 Km/hr. It is stopped by applying brakes withion with in 5 seconds. Calculate the amount of force required to stop the car.
Answers
Answer:
–2400 N
Explanation:
This is a physics question. However, the answer to the question is given below.
We'll begin by converting 36 Km/hr to m/s. This can be obtained as follow:
3.6 Km/hr = 1 m/s
Therefore,
36 Km/hr = 36 Km/hr × 1 m/s / 3.6 km/hr
36 Km/hr = 10 m/s
Thus, 36 Km/hr is equivalent 10 m/s.
Next, we shall determine the acceleration of the car. This can be obtained as follow:
Initial velocity (u) = 10 m/s
Final velocity (v) = 0 m/s
Time (t) = 5 s
Acceleration (a) =?
a = (v – u) / t
a = (0 – 10) / 5
a = – 10 / 5
a = –2 m/s²
Finally, we shall determine the force required to stop the car. This can be obtained as follow:
Mass (m) = 1200 Kg
Acceleration (a) = –2 m/s²
Force (F) =?
F = ma
F = 1200 × –2
F = –2400 N
NOTE: The negative sign indicate that the force is in opposite direction to the motion of the car.
Ca(s) + O2(g) -
O A. Cao(s)
B. Ca2O(s)
O C. 2Ca(s) + O2(g)
O D. CaO2(s)
Answers
Answer:
bbbbnnnnnnnnnnnnnnn
Explanation:
During the combustion of methane (CH4), one mole of methane gas combines with two moles of oxygen gas (O2) to produce one mole of carbon dioxide gas (CO2) and two moles of water vapor. Which of the following chemical equations correctly represents the combustion of methane described above
Answers
Answer:
CH4(g) +2O2____ CO2(g) +2H2O (l)
17.4 mL of alcohol is dissolved in enough water to make 131 mL of solution. What is the percentage by volume of this solution? (%v/v)
Answers
Explanation:
We are given: volume of alcohol = 17.4mL
: volume of solution = 131mL
\(\begin{gathered} Percent\text{ by volume = }\frac{volume\text{ of alcohol}}{volume\text{ of solution}}\times100 \\ \\ \text{ = }\frac{17.4}{131}\times100 \\ \\ \text{ = 13.28\%} \end{gathered}\)Answer:
Percent by volume is 13.28%.
Helppp me plzzzzz!!!
Answers
Answer:
they use echos to communicate
Explanation: dolphins make echos in order to signal there partners, and others in there pod. or they can use it to signal for prey, or signal that they are in trouble.
Answer: A good example for this one is bats.
Explanation: While a couple of bats are known to emanate the beats through their nose, most bats will in general express them. The recurrence is estimated to be around 200 heartbeats each second, nonetheless, the time frame can fluctuate with the types of a bat. Credits: Adi Ciurea/Shutterstock A bat's squeaks are more rewarding than Ben's on the grounds that with higher recurrence comes higher-goal or more distinctive detail – they are equipped for evading deterrents no more extensive than a human hair! They use it to find and explore towards prey, for example, a hurrying bug. As the distinguished sound waves that structure the pictures are basically echoes, they should adjust to a standard — the recovered train of heartbeats should be sufficiently noisy to get back to the sender, yet short sufficient with the end goal that the reverberation of the sender returns before the following one withdraw.
How many joules are required to convert 16.5 g g of ice at 0.0 ∘C ∘ C to liquid water at 32.0 ∘C ∘ C ? The heat of fusion of water is 334 J J /g g .
Answers
Answer:
5511 J
Explanation:
Applying,
Q = Cm.................... Equation 1
Where Q = amount of heat required to convert ice, C = Heat of fusion of water, m = mass of ice
From the question,
Given: C = 334 J/g, m = 16.5 g
Substitute these values into equation 2
Q = 334(16.5)
Q = 5511 J
Hence, the amount of heat required is 5511 J
HELP ME ASAP PLEASE LOTS OF POINTS
Determine the average atomic mass of Sulfur, given the following:
There are 3 isotopes of the element Sulfur the mass numbers and abundances are as follows:
S-32: 94.99%; S-33: .75%; S-34: 4.26%
Answers
Answer: 32.06 atomic mass units
Explanation:
in the titration of acetic acid, 5 ml of the acid are titarated with naoh. if 15 ml of acetic acid was used instead will this affect the determination of the acetic acid concentration and if so how?
Answers
The determination of the acetic acid concentration in a titration with sodium hydroxide (NaOH) will be affected if the volume of acetic acid used in the titration is changed from 5 mL to 15 mL.
In a titration, the volume of a solution of known concentration (the titrant) is added to a solution of unknown concentration (the analyte) until the reaction is complete. The concentration of the analyte can be determined by monitoring the volume of the titrant required to react with the analyte.
In the case of a titration of acetic acid (\(CH_{3}COOH\)) with sodium hydroxide (NaOH), the reaction between the two occurs as follows:
\(CH_{3}COOH+NAOH - > CH_{3}COONa + H_{2} O\)
The reaction is complete when the equivalence point is reached, which is the point at which all the acetic acid has reacted with the sodium hydroxide. At the equivalence point, the volume of sodium hydroxide required to react with the acetic acid can be used to determine the concentration of the acetic acid.
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calculate the number of atoms of sodium in a 4.5-gram sample
Answers
Answer:
1.18×10²³ atoms.
Explanation:
From Avogadro's hypothesis, we understood that 1 mole of any substance contains 6.02×10²³ atoms.
From the above concept, 1 mole of sodium also contains 6.02×10²³ atoms.
1 mole of sodium = 23 g.
Thus,
23 g of sodium contains 6.02×10²³ atoms.
Therefore, 4.5 g of sodium will contain = (4.5 × 6.02×10²³)/23 = 1.18×10²³ atoms.
From the above calculation,
4.5 g of sodium contains 1.18×10²³ atoms.
24. 00 ml of a 0. 25 m naoh solution is titrated with 0. 10m hcl. What is the ph of the solution after 24. 00 ml of the hcl has been added?.
Answers
pH of the solution after 24. 00 ml of the hcl has been added is 12.87
millimoles NaOH = mL x M = 24.00 mL x 0.25 M = 6.00
millimoles HCl = 24.00 mL x 0.10 M = 2.40
total volume = 48.00 mL
.................................NaOH + HCl ==>NaCl + H2O
initial.........................6.00.........0............0.........0
added.....................................2.40............................
change.................... -2.40......-2.40.........+2.40.... +2.40
equilibrium.................3.60.........0..............2.40.......2.40
The NaCl contributes nothing to the pH of the final solution. The pH is determined by the excess of NaOH present. (NaOH) = millimoles/mL = 3.60/48.00 = 0.075 M = (OH^-)
pOH = -log (OH^-). Then
pOH = -log (0.075)
pOH =1.1249
As we know,
pH + pOH = pKw = 14.00
pH=14-pOH
pH=14-1.1249
pH=12.87
What is pH?pH is a logarithmic measure of an aqueous solution's hydrogen ion concentration. pH = -log[H+], where log is the base 10 logarithm and [H+] is the concentration of hydrogen ions in moles per liter.
The pH of an aqueous solution describes how acidic or basic it is, with a pH less than 7 being acidic and a pH greater than 7 being basic. A pH of 7 is regarded as neutral (e.g., pure water). pH values typically range from 0 to 14, though very strong acids may have a negative pH and very strong bases may have a pH greater than 14.
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If two solutions with concentrations of 0. 2 m sugar and 0. 4 m sugar respectively are separated by a semipermeable membrane, during osmosis, what is the direction of the net flow?
Answers
Concentration is the amount of the solute dissolved in the solution. During osmosis, the flow of the solution will be from 0.2 M sugar solution to the 0.4 M solution.
What is osmosis?Osmosis is a transportation system that involves the flow of the less diluted solution towards the more concentrated solution. Also, it can be said that molecules from high water concentrations travel toward low water concentrations.
As the concentration of the 0.2 M sugar solution is less in solute concentration and high in water concentration, the net movement will be towards the 0.4 M solution with high solute and low water concentration.
Therefore, during osmosis, the molecule travels towards a 0.4 M solution.
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Put the substance in a 25 mL beaker.
Now, observe and record the following:
state of matter:
appearance and texture:
crystalline structure:
Answers
Answer:
liquid no not a solid
Explanation:
When you put the substance in a 25 mL beaker. then the state of matter is solid, appearance and texture are powdered and crystalline structure is not solid(powder).
What are crystalline structures and states of matter?The term "crystalline structure" refers to the arrangement of atoms, ions, or molecules in a crystalline solid. A crystalline solid is a type of material where the constituent particles are arranged in a regular, repeating pattern. This regular arrangement results in a characteristic geometric shape for the crystals. Examples of crystalline solids include salt, sugar, and diamond.
On the other hand, the term "state of matter" refers to the physical form in which matter exists. There are three primary states of matter: solid, liquid, and gas.
Solids have a definite shape and volume and their constituent particles are held tightly together by strong intermolecular forces.
Liquids have a definite volume but no definite shape, and their constituent particles are held together by weaker intermolecular forces.
Gases have no definite shape or volume, and their constituent particles are far apart and move freely.
Other states of matter, such as plasma and Bose-Einstein condensate, also exist but they are less common in everyday life.
Therefore, the state of matter: is solid, its appearance and texture: are powdered, and the crystalline structure: is not solid.
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From the viewpoint of the chemical reactants as the system, what do you expect for the signs of q and w in this process?.
Answers
When q and w are positive, energy flows into the system.
When atoms establish or break chemical bonds, chemical processes take place. Reactants are the substances that begin a chemical reaction, while products are the compounds that are created as a result of the reaction.
What are reactants and products in chemistry?Summary. A chemical reaction is described by an equation in chemistry. The left side of the equation lists reactants as the initial materials. The right-hand side of the equation lists the products, which represent the outcome of the reaction.In a chemical reaction, reactants undergo a chemical reaction and transform into products through a chemical process. For instance, when humans breathe in oxygen, it combines with glucose to create carbon dioxide, water, and energy. The response is provided below. C6H12O6 + O2 = 6CO2 + 6H2O + Energy.When atoms establish or break chemical bonds, chemical processes take place. Reactants are the substances that begin a chemical reaction, while products are the compounds that are created as a result of the reaction.To learn more about Chemical reaction refer to:
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