1. As the temperature of the gas in a balloon decreases, which of the following occurs? The volume of the balloon increases. *** The average kinetic energy of the gas decreases. The gas pressure inside the balloon increases. all of the above 2. If a sealed syringe is heated, in which direction will the syringe plunger move? out in The plunger will not move. ******** The direction cannot be predicted. 3. If a balloon containing 3000 L of gas at 39°C and 99 kPa rises to an altitude where the pressure is 45.5 kPa and the temperature is 16° C, the volume of the balloon under these new conditions would be calculated using the following conversion factor ratios: ____. Chemb.01.08.3a
Chemb.01.08.3b
Chemb.01.08.3c******
Chemb.01.08.3d
4. What happens to the partial pressure of oxygen in a sample of air if the temperature is increased?
It increases.
It stays the same.
It decreases.
The change cannot be determined. ******
5. A breathing mixture used by deep-sea divers contains helium, oxygen, and carbon dioxide. What is the partial pressure of oxygen at 101.4 kPa if PHe = 82.5 kPa andChemb.01.08.06= 0.4 kPa?
82.9 kPa******
19.3 kPa
18.5 kPa
101.0 kPa
6. Which of the following gases is the best choice for inflating a balloon that must remain inflated for a long period of time?
argon
oxygen
hydrogen *****
neon
Answers
Correct Answer: The average kinetic energy of the gas decreases.
Reason:
From the ideal gas equation, we know that PV = nRT
where, P = pressure, V = volume, n = number of moles of gas, R = gas constant and T = temperature.
From above equation, it can be seen that, Temp. as a direct relation with Pressure and Volume. Hence, as temperature of the gas in a balloon decreases, pressure and volume also decreases.
Also, from kinetic theory of gases, we know that, kinetic energy of gas increases with increasing temp. Hence, average kinetic energy of the gas decreases with decreasing temp.
Answer 2:
Correct answer: Out
Reason:
From the ideal gas equation, we know that PV = nRT
where, P = pressure, V = volume, n = number of moles of gas, R = gas constant and T = temperature.
Therefore, when a sealed syringe is heated, it's temp. will increase. This, will result in expansion of gas i.e volume will increase. Hence, syringe plunger move in outwards direction.
Answer 3: Volume = 6046 L
Reason:
From the ideal gas equation, we know that PV = RT
where, P = pressure, V = volume, R = gas constant and T = temperature.
Given: P1 = 99 kPa, V1 = 3000 L, T1 = 312 K, P2 = 45.5 KPa and T2 = 289 K.
Therefore, we have:
Thus,
Hence, V2 = 6046 L
Answer 4:
Correct Answer: It increases
Reason:
We know that, pressure of gas, it directly proportional to temp. Hence, when the temp. of as is increases. Total pressure of gas mixture increases. This is because, partial pressure of individual component (in present case oxygen) increases.
Answer 5:
Correct answer: 18.5 kPa
Reason:
We know that, total pressure is the sum of the partial pressures of the gases present in it. Mathematically, it can be expressed as:
Ptot = PO2 + PHe + PCO2
Therefore, partial pressure of oxygen, PO2:
PO2 = Ptot − PHe − PCO2
= 101.4 − 82.5 − 0.4
=18.5 kPa.
Answer 6:
Correct Answer: Argon
Reason:
Inert gases are the best choice for inflating a balloon that must remain inflated for a long period of time. Among given options, both neon and argon are inert gas, But, atomic weight of Ar is 40g/mol, while is more than that of neon (20 g/mol). Hence,. Argon gas is preferred over neon gas.1. As the temperature of the gas in a balloon decreases, the average kinetic energy of the gas decreases.
2. The direction in which the syringe plunger would move is Out.
3. The volume of the balloon under these new conditions would be calculated using the following conversion factor ratios 6046 L.
4. It increases
5. 18.5 kPa
6. Argon
What is the average kinetic energy?
The average kinetic energy is the one and a half of the mass (m) of each gas molecule multiplied by the square of the RMS speed (vrms). There is a relationship between the pressure of a gaseous substance and the temperature of a gas.
Given the pressure of the gas in question 2, we can expect the direction in which the syringe plunger would move to be out.
Learn more about average kinetic energy here:
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Answers
Answer: The molar mass of the element is 40 g/mol and element is Calcium.
Explanation:
At STP:
1 mole of a gas contains 22.4 L of volume
Molar mass is defined as the mass of 1 mole of a substance.
To calculate mass of of the substance, we use the equation:
Volume of gas = 22.4 L
Density of gas = 1.7824 g/L
Putting values in above equation, we get:
The element having molar mass 40 g is Calcium.
Hence, the molar mass of the element is 40 g/mol and element is Calcium.
Answers
The correct scientific notation form of the number 5,489.6654 using only 2 significant figures is: 5.5 * 10³
What is scientific notation
Scientific notation is a way to represent very large or very small numbers in a more concise and manageable format. It consists of two parts: a coefficient and an exponent of 10.
In your given number, 5,489.6654, we want to express it in scientific notation using only 2 significant figures. Significant figures are the digits in a number that contribute to its precision.
Identify the significant figures: From the given number, we have two significant figures, which are 5 and 4.
Determine the coefficient: To represent the number in scientific notation, we want the coefficient to be between 1 and 10. In this case, we can round the number to 5.5 (rounding the 8 up).
Determine the exponent of 10: To express the number 5.5 in scientific notation, we need to move the decimal point in the original number to the right by one place.
Learn more about scientific notation
#SPJ3
Answer:
5.4 × 10^3.
Explanation:
Not 5.49 × 10^3, 5.4 × 10^7, or 5.5 × 10^3.
Answers
KE = (3/2)(nRT)
= (3/2)(1mol)(8.314J/molK)(100+273.15) = 4204.6J
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A. Chlorine
B. Sulfur
C. Oxygen
D. None of the above
Answers
Answer:
D. None of the above
Explanation:
All the answer choices listed only have 2-3 items in the electron configuration.
Mn and Al3+
Al and Mn
Mn2+ and Al3+
Answers
The reactants that would lead to a spontaneous reaction are Mn2+ and Al3+. Al and Mn are not because they are stable reactants. Mn and Al3+ are not because Mn is stable. Mn2+ and Al are not because Al is stable.
Answer:
ITS B
Explanation:
I took the test on edge