Chemistry H Midterm Exam Practice
A scientist obtains the number 0.045006700 on a calculator. If this number actually has four (4) significant figures, how should it be written? A) 0.4567 B) 0.4501 C) 0.0450 D) 0.04500 E) 0.04501
E
Consider the following three archery targets: (flip card) 3) Which of the following figure(s) represent a result having high precision? A) Figure c only B) Figure a only C) Figure b only D) Figure c and Figure a E) Figure a and Figure b
E
Convert 4377 mL to qts. (1 L = 1.06 qt) A) 4640 qts B) 4.129 qts C) 4.129 x 10^-3 qts D) 4129 qts E) 4.640 qts
E
Convert 4668.2 g to mg. A) 4.6682 mg B) 46.682 mg C) 466.82 mg D) 4.6682 x 10^3 mg E) 4.6682 x 10^6 mg
E
Convert 47.0 mi to km. (1 m = 1.094 yds, 1 mi =1760 yds) A) 5.14 x 10^1 km B) 2.92 x 10^1 km C) 7.56 x 10^7 km D) 4.30 x 10^` km E) 7.56 x 10^1 km
E
How many significant figures are there in the number 3.1400? A) 1 B) 2 C) 3 D) 4 E) 5
E
The beakers shown below have different precisions as shown Suppose you pour the water from these three beakers into one container. What would be the volume in the container reported to the correct number of significant figures? A) 78.817 mL B) 78.82 mL C) 78.8 mL D) 80 mL E) 79 mL
E
What is the best answer to report for (495 x 0.0045) + 23.45? A) 25.678 B) 25.68 C) 25.6775 D) 26 E) 25.7
E
A 20.0 mL sample of glycerol has a mass of 25.5 grams. What is the density of glycerol in ounces/quarts? (1.00 ounce = 28.4 grams, and 1.00 liter = 1.06 quarts) A) 42.4 oz/qt B) 4.24 x 10^-2 ox/qt C) 847 oz/qt D) 47.6 oz/qt E) 26.1 oz/qt
A
The agreement of a particular value with the true value is called A) accuracy B) error C) precision D) significance E) certainty
A
The amount of uncertainty in a measured quality is determined by: A) both the skill of the observer and the limitations of the measuring instrument B) neither the skill of the observer nor the limitations of the measuring instrument C) the limitations of the measuring instrument only D) the skill of the observer only E) none of these
A
The density of a liquid is determined by successively weighing 25, 50, 75, 100, and 125 mL of the liquid in a 250-mL beaker. Considering the plot of total mass (y-axis) versus volume (x-axis), which of the following is true? A) The plot should be rather linear because the slope measures the density of a liquid B) The plot should be curved upward because the slope measures the density of a liquid C) The plot should be curved upward because the mass of the liquid is higher in successive trials D) The plot should be linear because the mass of the beaker stays constant E) None of the above
A
The density of gasoline is 0.7025 g/mL at 20 degrees C. When gasoline is added to water: A) It will float on top B) It will sink to the bottom C) It will mix so you can't see it D) The mixture will improve the running of the motor E) None of these things will happen
A
Using the rules of significant figures, calculate the following: 4.0021-0.091 A) 3.911 B) 4 C) 3.9111 D) 3.91 E) 3.9
A
Express 165,000 in scientific notation. A) 1.65000 x 10^5 B) 1.65 x 10^5 C) 1.6500 x 10^-5 D) 1.65 x 10^-5 E) 165 x 10^3
B
The density of a liquid is determined by successively weighing 25, 50, 75, 100, and 125 mL of the liquid in a 250-mL beaker. If volume of liquid is plotted along the horizontal axis, and total mass of beaker plus liquid is plotted on the vertical axis: A) The x, or horizontal, intercept is the negative value of the weight of the beaker B) The y, or vertical, intercept is the weight of the empty beaker C) The slope of the line is 1.0 D) The line will pass through the origin E) The slope of the line is independent of the identity of the liquid
B
We generally report a measurement by recording all of the certain digits plus _______ uncertain digit(s). A) no B) one C) two D) three E) four
B
Which of the following statements concerning these figures is correct? A) Figure c represents systematic error and Figure a represents random error B) Figure c represents random error and Figure a represents random error C) Figure c and Figure a represent random error D) Figure c and Figure a represent systematic error E) Figure b represents no errors
B
2) As part of the calibration of a new laboratory balance, a 1.000-g mass is weighed with the following results: Trial Mass 1 1.201 +- 0.001 2 1.202 +- 0.001 3 1.200 +- 0.001 The balance is: A) Both accurate and precise B) Accurate but imprecise C) Precise but inaccurate D) Both inaccurate and imprecise E) Accuracy and precision are impossible to determine with the available information
C
How many significant figures are there in the number 0.04560700? A) 4 B) 5 C) 7 D) 8 E) 9
C
In the spring of 2008, petrol cost (pound)1.179 per liter in London. On the same day, the exchange rate was $1 = (pound)0.491. What was the price of London petrol in dollars ($) per gallon? (1 gal= 3.7854 L) A) $4.46 /gal B) $2.19 /gal C) $9.09 /gal D) $1.58 /gal E) $7.71 /gal
C
Consider the numbers 23.68 and 4.12. The sum of these numbers has ________ significant figures, and the product of these numbers has ________ significant figures. A) 3, 3 B) 4, 4 C) 3, 4 D) 4, 3 E) none of these
D
Express the number 0.000769 in scientific notation. A) 769 x 10^6 B) 7.69 x 10^2 C) 7.69 x 10^4 D) 7.69 x 10^-4 E) 0.769 x 10^-3
D
Express the volume 114.0 cm^3 in liters. A) 114.0 L B) 11.40 L C) 1.140 L D) 0.1140 L E) 0.01140 L
D
How many significant figures are there in the number 0.0001871? A) 7 B) 3 C) 8 D) 4 E) 0
D