Physical & Inorganic Quiz
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Questions and Answers
- 1.
760 torr has ......... atomosphere.
- A.
760
- B.
1
- C.
1.0123
- D.
5
Correct Answer
B. 1 -
- 2.
3030 has ......... significant figures.
- A.
4
- B.
2
- C.
3
- D.
1
Correct Answer
C. 3Explanation
The number 3030 has three significant figures because all non-zero digits are considered significant, and there are no trailing zeros after the decimal point.Rate this question:
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- 3.
A 423 mL sample of dry oxygen at STP is transferred to a container overwater at 22° C and 738 mm Hg. What is the new volume of the oxygen?
- A.
484 L
- B.
500 L
- C.
620 L
- D.
484 mL
Correct Answer
D. 484 mLExplanation
When a sample of dry oxygen at STP (standard temperature and pressure) is transferred to a container over water at a different temperature and pressure, the volume of the oxygen will change. In this case, the new volume of the oxygen is given as 484 mL. This means that the volume of the oxygen has decreased when it is transferred to the container over water at 22°C and 738 mm Hg.Rate this question:
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- 4.
Round 45.2365 to 3 SF.
- A.
45.3
- B.
45.4
- C.
45.2
- D.
46
Correct Answer
C. 45.2Explanation
To round 45.2365 to 3 significant figures, we look at the digit after the third significant figure, which is 6. Since 6 is greater than 5, we round up the third significant figure, which is 5. Therefore, the correct answer is 45.2.Rate this question:
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- 5.
How many moles of gas are there in a volume of1.00 L at 1.00 MPa and 500 K? Assume ideal gasbehaviour. (1 MPa = 1×1000000 Pa)
- A.
22.4 mol
- B.
0.55 mol
- C.
0.24 mol
- D.
4.2 mol
Correct Answer
C. 0.24 molExplanation
The ideal gas law equation is PV = nRT, where P is the pressure, V is the volume, n is the number of moles, R is the ideal gas constant, and T is the temperature. Rearranging the equation to solve for n, we have n = PV/RT. Given that P = 1.00 MPa = 1.00 x 10^6 Pa, V = 1.00 L, R = 8.314 J/(mol K), and T = 500 K, we can substitute these values into the equation to find n. Plugging in the values, we get n = (1.00 x 10^6 Pa) x (1.00 L) / (8.314 J/(mol K) x 500 K) = 0.24 mol. Therefore, there are 0.24 moles of gas in a volume of 1.00 L at 1.00 MPa and 500 K.Rate this question:
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- 6.
A sample of gas occupies 17 mL at -112 c ... What volume does the sample occupies at 70 c ?
- A.
36 L
- B.
27 L
- C.
36 mL
- D.
27 mL
Correct Answer
C. 36 mLExplanation
When the temperature of a gas increases, its volume also increases, assuming the pressure and amount of gas remain constant. This relationship is described by Charles's Law. Therefore, if the initial volume of the gas is 17 mL at -112°C and it is heated to 70°C, the volume of the gas will increase. The correct answer is 36 mL, as it represents the increased volume of the gas at the higher temperature.Rate this question:
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- 7.
A sample of hydrogen has an initial temperature of 50.° C. When thetemperature is lowered to -5.0° C, the volume of hydrogen becomes212 cm3. What was the initial volume of the hydrogen in dm3?
- A.
0.233
- B.
0.256
- C.
0.244
- D.
0.279
Correct Answer
B. 0.256 -
- 8.
Express 0.00560 in exponential notation
- A.
5.60 × 10^3
- B.
5 × 10^-3
- C.
5.60
- D.
5.60 × 10^-3
Correct Answer
D. 5.60 × 10^-3Explanation
The given number, 0.00560, can be expressed in exponential notation as 5.60 × 10^-3. This is because the decimal point is moved three places to the right to obtain the number 5.60, and then the exponent -3 is added to indicate that the decimal point was moved to the left by three places.Rate this question:
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- 9.
Which of the following metric relationships is incorrect
- A.
1 gram = 10^2 centigrams
- B.
1 gram = 10^3 kilograms
- C.
103 milliliters = 1 liter
- D.
10 decimeters = 1 meter
Correct Answer
B. 1 gram = 10^3 kilogramsExplanation
The given metric relationship states that 1 gram is equal to 10^3 kilograms. This is incorrect because 1 kilogram is equal to 10^3 grams, not the other way around.Rate this question:
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- 10.
The degree of agreement among several measurements of the same quantity is called
- A.
Precision
- B.
Significance
- C.
Accuracy
- D.
Certainty
Correct Answer
A. PrecisionExplanation
Precision refers to the degree of agreement among several measurements of the same quantity. It indicates how close the measurements are to each other and how consistent they are. A high level of precision means that the measurements are very close to each other, while a low level of precision indicates that there is a significant amount of variation among the measurements. Therefore, precision is the correct answer for this question.Rate this question:
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- 11.
According to the law of multiple proportions
- A.
If the same two elements form two different compounds, they do so in the same ratio
- B.
The ratio of the masses of the elements in a compound is always the same.
- C.
It is not possible for the same two elements to form more than one compound
- D.
None of these
Correct Answer
D. None of theseExplanation
The correct answer is "none of these" because the law of multiple proportions states that if the same two elements form two different compounds, they do so in ratios of small whole numbers. This means that the ratio of the masses of the elements in a compound is not always the same. Additionally, it is possible for the same two elements to form more than one compound, which contradicts the third statement.Rate this question:
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- 12.
A 40.0 L tank of ammonia has a pressure of 12.7 kPa. Calculate the volume of the ammonia if itspressure is changed to 8.4 kPa while its temperature remains constant
- A.
70.5 L
- B.
70 L
- C.
60.5 L
- D.
55.5 L
Correct Answer
C. 60.5 LExplanation
When the pressure of a gas is changed while the temperature remains constant, we can use Boyle's Law to calculate the new volume. Boyle's Law states that the pressure and volume of a gas are inversely proportional, meaning that as the pressure decreases, the volume increases. Using this relationship, we can set up the following equation: (initial pressure) x (initial volume) = (final pressure) x (final volume). Plugging in the given values, we have (12.7 kPa) x (40.0 L) = (8.4 kPa) x (final volume). Solving for the final volume gives us 60.5 L. Therefore, the correct answer is 60.5 L.Rate this question:
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- 13.
100 g of oxygen(O2) is added to the gas in Question 16. What is the volume of the combined gases atSTP.
- A.
110 L
- B.
115 L
- C.
120 L
- D.
125 L
Correct Answer
A. 110 LExplanation
When 100 g of oxygen (O2) is added to the gas, it means that the volume of the gas increases. According to Avogadro's law, equal volumes of gases at the same temperature and pressure contain an equal number of molecules. Therefore, the volume of the combined gases at STP would still be 110 L, which is the same as the original volume given in the question.Rate this question:
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- 14.
The pressure of a gas is reduced from 1200.0 mm Hg to 850.0 mm Hg as the volume of its containeris increased by moving a piston from 85.0 mL to 350.0 mL. What would the final temperature be ifthe original temperature was 90.0 °C?
- A.
1058.75 L
- B.
1111.88 K
- C.
1058.75 K
- D.
2365.17 K
Correct Answer
C. 1058.75 K -
- 15.
2.026500 has 7 DP.
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
The given statement "2.026500 has 7 DP" is false. DP stands for decimal places, which refers to the number of digits after the decimal point in a number. However, in the number 2.026500, there are only 6 digits after the decimal point, not 7. Therefore, the correct answer is false.Rate this question:
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- 16.
In neutral atom .. number of protons differ from number of electrons.
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
In a neutral atom, the number of protons is equal to the number of electrons. This is because the atom has no overall charge, so the positive charge of the protons is balanced by the negative charge of the electrons. Therefore, the statement that the number of protons differs from the number of electrons in a neutral atom is incorrect.Rate this question:
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Current Version
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Mar 21, 2023Quiz Edited by
ProProfs Editorial Team -
Oct 17, 2016Quiz Created by
Galalghazy
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