Module 1; Scientific Measurements Competency Diagnostic

The melting point of tungsten is 3695 K. What is the melting point of tungsten in ºF? 7174ºF 6191ºF 4218ºF 3236ºF

6191ºF

0/1 Suppose you run a total of 4.35 miles in 58.75 minutes. What is your average running speed in units of km/hr? 1 mile = 5280 ft, 1 ft = 12 in, 1 in = 2.54 cm, 100 cm = 1 m, 60 minutes = 1 hour. 0.140 km/hr 0.0740 km/hr 116 km/hr 7.15 km/hr

7.15 km/hr

Which set of measurements is correctly ordered from largest to smallest? 18.1 ns, 7.22 s, 9.04 μs, 87.1 ns 7.22 s, 18.1 ms, 9.04 μs, 87.1 ns 7.22 s, 9.04 μs, 18.1 ms, 87.1 ns 87.1 ns, 9.04 μs, 18.1 ms, 7.22 s

7.22 s, 18.1 ms, 9.04 μs, 87.1 ns

Convert the following value to scientific notation: 0.007246 7.246 x 10^2 7.246 x 10^3 7.246 x 10^-2 7.246 x 10^-3

7.246 x 10^3

0/1 A particular photon of infrared light has a wavelength of 7.35 x 10^-7 m. Given the conversion factor 1 nm = 10^-9 m, express the wavelength of the photon in nanometers (nm). 1.36 x 10^-15 nm 7.35 x 10^-16 nm 1.36 x 10^-3 nm 7.35 x 10^2 nm

7.35 x 10^2 nm

Which set of measurements is correctly ordered from largest to smallest? 8.0 nm, 12 μm, 4,9 mm, 7.7 m 12 μm, 8.0 nm, 7.7 m, 4.9 mm 4,9 mm, 7.7 m, 8.0 nm, 12 μm 7.7 m, 4.9 mm, 12 μm, 8.0 nm

7.7 m, 4.9 mm, 12 μm, 8.0 nm

1/1 Complete the following mathematical equation: 4.8×10^5 over 6.1×10^−4 7.9 x 10^0 7.9 x 10^8 7.9 x 10^9 7.9 x 10^-1

7.9 x 10^8

The density of acetone is stated to be 791 kg/m3, and 1 m3 = 1 x 106 cm3. Determine the density of acetone in g/cm3. 7.91 x 10^-1 g/cm3 7.91 x 10^-7 g/cm3 7.91 x 10^5 g/cm3 7.91 x 10^-3 g/cm3

7.91 x 10^5 g/cm3 probably wrong

0/1 What is 298 K converted into degrees Fahrenheit? 45ºF 171ºF 77ºF 25ºF

77ºF

0/1 Which of the following is in incorrect scientific notation? 9 x 10^2 7.77 x 10^0 81.3 x 10^4 1.00 x 10^-13

81.3 x 10^4

The normal (standard-pressure) boiling point of argon is -302.5ºF. What is the normal boiling point of argon in kelvin (K)? -47.2 K 123 K 87.3 K 72.9 K

87.3 K

± 0.01 g

The mass of a chunk of silicon is measured using the electronic balance pictured below. The mass measurement is 24.32 g. What is the uncertainty, in grams, of the measurement? ± 0.001 g ± 0.01 g ± 0.24 g ± 0.005 g

Which of the following options must be measured with some degree of uncertainty? The number of eggs in a basket The number of books on a shelf The number of centimeters in a meter The mass of a textbook

The mass of a textbook

What is the value of the following expression in correct significant figures? 15 - 0.15 - 0.6155 = 14.234 14.23 14.2345 14

14

0/1 What is the value of the following expression in correct significant figures? 12.3 + 150 + 26.009 = 188 190 188.3 188.309

190

0/1 What is the value of the following expression in correct significant figures? 28.0/13.483 = 2.08 2.077 2.0767 2.1

2.08

0/1 Convert the following value to scientific notation: 234,000,000 2.34 x 10^8 2.34 x 10^-8 2.34 x 10^7 2.34 x 10^-7

2.34 x 10^8

0/1 Calculate the density of aluminum if 27.6 cm3 has a mass of 74.6 g. 0.370 cm3/g 2.70 cm3/g 2.70 g/cm3 0.370 g/cm3

2.70 g/cm3

0/1 What is the value of the following expression in correct significant figures? 628 x 342 = 215,000 or 2.15 x 10^5 21,480 or 2.148 x 10^5 214,776 or 2.14776 x 10^5 220,000 or 2.2 x 10^5

215,000 or 2.15 x 10^5

Osmium is one of the densest elements known. What is its density if 2.72 g has a volume of 0.121 cm3? 0.0445 g/cm3 22.5 cm3/g 0.0445 cm3/g 22.5 g/cm3

22.5 g/cm3

The freezing point of mercury is -37.9ºF. What is the freezing point of mercury in ºC? -38.8ºC -53.0ºC -55.7ºC -36.2ºC

-38.8ºC

What is the correct expression of 9.405 x 10^-6 in decimal (standard) notation? 94,050,000 9,405,000 0.000009405 0.0000009405

0.000009405

Which of the following numbers is the smallest? 0.000469, 4.69 x 104, 4.69 x 10-3, 4.69 x 10-2 4.69 x 10^-3 4.69 x 10^-2 0.000469 4.69 x 10^4

0.000469

What is the correct expression of 6.51 x 10^-4 L in decimal (standard) notation? 6,510,000 L 0.0000651 L 65,100 L 0.000651 L

0.000651 L

One measure of solubility is concentration in grams per liter. What is the concentration of copper(II) ions, in grams per liter, measured in a 0.200 L sample of water in which 0.00026 g of copper(II) ions are present? 0.00026 g/L or 2.6 x 10-4 g/L 0.0013 g/L or 1.3 x 10-3 g/L 770 g/L or 7.7 x 102 g/L 0.000052 g/L or 5.2 x 10-5 g/L

0.0013 g/L or 1.3 x 10-3 g/L

What is the value of the following expression in correct significant figures? 0.147 + 0.0066 + 0.012 = 0.166 0.17 0.1656 0.2

0.166

What is the value of the following expression in correct significant figures? 8119 x 0.000023 = 0.19 0.2 0.1867 0.18673

0.19

Target B

0/1 Five darts are thrown in an attempt to hit the center of a target. Which target represents a set of throws that is precise but not accurate?

The normal (standard-pressure) boiling point of carbon disulfide is 46.3ºC. What is the normal boiling point of carbon disulfide in ºF? 141ºC 104ºC 115.3ºF 57.7ºC

115.3ºF

1.60 ± 0.01 cm

0/1 Which of the following is an appropriate reading of the length of the push pin, including the correct units and degree of uncertainty? A push pin measures six lines above the 1cm increment and four lines below the 2 cm increment Unless otherwise stated, the uncertainty of an analog instrument is ± 0.1 of the instrument's smallest increment. 1.6 ± 0.1 cm 2.4 ± 0.1 cm 2.40 ± 0.01 cm 1.60 ± 0.01 cm

0/1 The density of fluorine gas is measured to be 1.70 g/L. What is the mass of a 0.595 L sample of fluorine gas? 0.350 g 2.86 g 1.01 g 2.30 g

1.01 g

What is the mass, in milligrams of a protein sample measured to be 1.44 x 10^-2 μg? 1.44 x 10^-5 mg 1.44 x 10^1 mg 1.44 x 10^7 mg 1.44 x 10^-11 mg

1.44 x 10^-5 mg

43.0 mL

1/1 What is the measurement on the instrument to the correct number of significant figures? 43.00 mL 43.0 mL 44.0 mL 43 mL

Which set of measurements is correctly ordered from smallest to largest? 277 kg, 277 cg, 277 mg, 277 μg 277 μg, 277 mg, 277 cg, 277 kg 277 kg, 277 μg, 277 cg, 277 mg 277 μg, 277 cg, 277 kg, 277 mg

277 μg, 277 mg, 277 cg, 277 kg

A student uses an electronic balance to measure the mass of a mousetrap-powered vehicle and obtains the reading of 700 g. The uncertainty of the instrument is stated to be ± 1 g. How many significant figures does the student's measurement have? 3 2 4 1

3

0/1 A technician reads and records the air pressure from several pressure gauges. The following table shows each air pressure reading in Pascals (Pa): Pressure Gauge Air Pressure (Pa) 1 2.1 x 10^3 2 5.2 x 10^5 3 1.7 x 10^-1 4 3.1 x 10^6

3, 1, 2, 4

What is the mass of 4.00 cm3 of sodium, which has a density of 0.97 g/cm3? 4.1 g 3.9 g 4.1 cm3 39 cm3

3.9 g

1/1 Order the following measurements from largest to smallest: 10 ng, 100 g, 30 kg 10 ng, 100 g, 30 kg 30 kg, 10 ng, 100 g 10 ng, 30 kg, 100 g 30 kg, 100 g, 10 ng

30 kg, 100 g, 10 ng

0/1 Normal human body temperature is 37.0ºC. What is normal human body temperature in kelvin (K)? 236.2 K 310.2 K -236.2 K 282.2 K

310.2 K

A sound wave in still air requires 0.00420 seconds to travel 1.41 meters. What is the speed of the sound wave, in meters per second? 298 m/s or 2.98 x 102 m/s 0.00298 m/s or 2.98 x 10-3 m/s 336 m/s or 3.36 x 102 m/s 0.00592 m/s or 5.92 x 10-3 m/s

336 m/s or 3.36 x 102 m/s

0/1 In studying a researcher's laboratory notebook, you observe a mass measurement recorded as 0.07070 g. How many significant figures does the mass measurement have? 4 2 3 5

4

Which of the following numbers is the largest? 470, 4.70 x 102, 4.70 x 103, or 4.70 x 101 4.70 x 10^2 4.70 x 10^1 470 4.70 x 10^3

4.70 x 10^3

Which measurement best describes the amount of water in a home aquarium? 4 L 40 L 1.25 L 355 mL

40 L

What is the correct expression of 4.6377 x 10^5 in decimal (standard) notation? 0.0000046377 46,377 0.000046377 463,770

463,770

Which set of measurements is correctly ordered from least to greatest? 5.45 x 10^-3 m, 1.10 x 10^-1 m, 8.39 x 10^2 m, 3.62 x 10^4 m 1.10 x 10^-1 m, 8.39 x 10^2 m, 5.45 x 10^-3 m, 3.62 x 10^4 m 1.10 x 10^-1 m, 3.62 x 10^4 m, 5.45 x 10^-3 m, 8.39 x 10^2 m 3.62 x 10^4 m, 8.39 x 10^2 m, 1.10 x 10^-1 m, 5.45 x 10^-3 m

5.45 x 10^-3 m, 1.10 x 10^-1 m, 8.39 x 10^2 m, 3.62 x 10^4 m

1/1 Which of the following is the largest number? 4.77 x 10^8, 5.82 x 10^8, 1.42 x 10^8, or 6.11 x 10^8 4.77 x 10^8 1.42 x 10^8 5.82 x 10^8 6.11 x 10^8

6.11 x 10^8

The speed of light in a vacuum is 3.00 x 108 meters per second (m/s). A light year is the distance that light would travel in one year. Using the conversion 3.15 x 107 seconds per year (s/yr), calculate the distance, in km, of a light year. 9.45 x 1018 km 9.45 x 1012 km 9.52 x 1011 km 9.52 x 1014 km

9.52 x 10^14 km probably wrong

You place a mass of 250 grams on the measurement tray of a triple beam balance and then set the rider on the 500 gram beam to the 200 gram mark (the other riders are set to 0 grams). Which of the following statements is true? A. The pointer will be above the zero mark. B. The pointer will be below the zero mark. C. The pointer will be lined up with the zero mark. D. The pointer will move up and down once per second.

A. The pointer will be above the zero mark.

Four balances, with stated measurement uncertainty of ±0.2 g, were tested using a calibration weight that has a known mass of 100.0 g. The four sets of mass measurements are represented in the options below. Match each set of measurements with its description. 100.0 ± 1.3 g 96.4 ± 3.6 g 105.0 ± 0.1 g 100.0 ± 0.2 g

Accurate but not precise Neither accurate nor precise Precise but not accurate Both accurate and precise

You are determining the mass of an object using a triple beam balance. When the pointer is lined up with the zero mark, the riders show values of 300 grams, 20 grams, and 8.10 grams. What is the mass of the object? A. 272.10 grams B. 328.10 grams C. 439.10 grams D. 48000 grams

B. 328.10 grams

B. The mass is slightly less than 255 grams

Based on the image, what can you infer about the mass of the object being measured? A. The mass is exactly 255.00 grams. B. The mass is slightly less than 255 grams. C. The mass is slightly more than 255 grams. D. The mass is not exactly 255 grams, but it is impossible to tell whether the mass is greater than or less than 255 grams.

B. 501.00 grams

Based on the image, what is the mass of the object being measured? A. 500.10 grams B. 501.00 grams C. 510.0 grams D. 600 grams

Which unit is used to measure mass in the metric system? A. Pound B. Slug C. Ounce D. Gram

D. Gram

What are precise measurements? Precise measurements are all made with the same units. Precise measurements are all made with different instruments. Precise measurements are close to a true, hypothetical value. Precise measurements are all within a narrow range of values.

Precise measurements are all within a narrow range of values.

0/1 Each member of a group of Girl Scouts receives the same instructions to meet the troop leader before a hike. Each member of the group follows the instructions and arrives at the same place, although the troop leader is waiting for the Scouts at a completely different location. Which correctly describes the instructions the Scouts received? The directions are neither accurate nor precise. The directions are precise and accurate. The directions are accurate, but not precise. The directions are precise, but not accurate.

The directions are precise, but not accurate.

16.4ºC

What is the correct measurement of the temperature on the thermometer shown below? 16.45ºC 16.4ºC 16ºC 17.5ºC

3.80 ± 0.01 cm

Which of the following is an appropriate reading of the length of the paperclip, including the correct units and degree of uncertainty? 4.2 ± 0.1 cm 3.8 ± 0.1 cm 3.80 ± 0.01 cm 4.20 ± 0.01 cm

40.0 ± 0.1 mL

Which of the following is an appropriate reading of the volume of the liquid, including the correct units and degree of uncertainty? A graduated cylinder measures a liquid. The liquid fills the cylinder to the line indicating 40 mL. 40 ± 1 mL 40.0 ± 0.1 mL 40.00 ± 0.01 mL 40.000 ± 0.001 mL

1.60 ± 0.01 cm

Which of the following measurements is an appropriate reading of the length of the push pin, including the correct units and degree of uncertainty? 1.6 ± 0.1 cm 1.60 ± 0.01 cm 2.4 ± 0.1 cm 2.40 ± 0.01 cm

368.30 ± 0.01 g

Which of the following measurements is an appropriate reading of the mass of the soda can, including the correct units and degree of uncertainty? 368.30 ± 0.01 g 368.3 ± 0.1 g 638.3 ± 0.1 g 638.30 ± 0.01 g

23.5 ± 0.1 mL

Which of the following measurements is an appropriate reading of the volume of the liquid, including the correct units and degree of uncertainty? 23.5 ± 0.1 mL 36.50 ± 0.01 mL 23.50 ± 0.01 mL 36.5 ± 0.1 mL

0/1 A particular laboratory thermometer provides readings that are consistently 0.6ºC less than the true value. Five measurements of the temperature of a well-stirred ice-water mixture were obtained with the thermometer. The measurements were -0.6ºC, -0.6ºC, -0.6ºC, -0.5ºC, and -0.6ºC. Select the option that correctly states whether the thermometer can be used to correctly determine the temperature change of a chemical reaction and states the correct reason. No, because measurements made with the thermometer are not precise enough to make up for the inaccuracy of the temperature readings. Yes, because the measurements are inaccurate by the same amount, so the difference in two measurements of temperature will be accurate. Yes, because although the measurements will be inaccurate, the precision of the thermometer makes up for the inaccuracy of the instrument. No, because measurements taken with an instrument known to be inaccurate can never be used to determine accurate values.

Yes, because the measurements are inaccurate by the same amount, so the difference in two measurements of temperature will be accurate.

The measurement 0.50 liters is closest to _______ water in a home aquarium cola in a soft drink can juice in a full pitcher water in a full bathtub

cola in a soft drink can

Choose the unit of measure that provides the best estimate. A child's tricycle is about 5 ____ tall. dm mm cm m

dm

Which unit correctly represents the density of an irregular object? g/m g/mL g mL

g/mL

Match each of the given measurements with the appropriate unit of measure. Volume of 122 g of water Time required for light to travel one meter Distance between atoms in a molecule Mass of water drained from a half-filled 200 L drum

mL ns pm kg

0/1 Match each of the given powers of ten with its SI prefix. 10^-6 10^6 10^-3 10^3

micro mega (M) milli (m) kilo (k)

Which of the following units is used to measure a different quantity than the other units? centimeter light year second inch

second