Q&A Hero

Q: The mass of a proton is 1.67 10-27 kg. What is the mass of a proton in nanograms? A) 1.67 10-21 ng B) 1.67 10-18 ng C) 1.67 10-15 ng D) 1.67 10-12 ng

Q: Which of the following is the greatest mass? A) 10,000,000 μg B) 1.000 100 kg C) 1.000 100 cg D) 1.000 10-4 Mg

Q: Without using a calculator, solve the following problem: A) 1 100 B) 1 10-3 C) 1 10-9 D) 1 10-12

Q: Without using a calculator, solve the following problem: A) 1 102 B) 1 108 C) 1 1020 D) 1 1026

Q: To the correct number of significant figures, what is the level of the liquid in the buret?A) 0.2 mLB) 0.29 mLC) 0.3 mLD) 0.35 mL

Q: To the correct number of significant figures, what is the volume of the liquid in the graduated cylinder? A) 7 mL B) 7.0 mL C) 7.7 mL D) 8 mL

Q: What is the temperature reading on the following Celsius thermometer in degrees Kelvin? A) 2.8882 K B) 15.6K C) 15.67K D) 288K

Q: What is the temperature reading on the following Celsius thermometer in degrees Kelvin? A) 2.95 K B) 21.7K C) 21.6K D) 2.9 K

Q: To the correct number of significant figures, what is the temperature reading on the following Celsius thermometer? A) 15C B) 15.6C C) 15.67C D) 16C

Q: To the correct number of significant figures, what is the temperature reading on the following Celsius thermometer? A) 21C B) 21.7C C) 21.70C D) 22C

Q: If hitting the bullseye is the desired result, Figure (c) represents A) good accuracy and good precision. B) good accuracy and poor precision. C) poor accuracy and good precision. D) poor accuracy and poor precision.

Q: If hitting the bullseye is the desired result, Figure (b) represents A) good accuracy and good precision. B) good accuracy and poor precision. C) poor accuracy and good precision. D) poor accuracy and poor precision.

Q: If hitting the bullseye is the desired result, Figure (a) represents A) good accuracy and good precision. B) good accuracy and poor precision. C) poor accuracy and good precision. D) poor accuracy and poor precision.

Q: A certain solid has a density of 8.0 g/cm3. If 4.0 g of this solid are placed into 4.00 mL of water, which drawing below most closely represents the volume of water after the solid is added? A) drawing (a) B) drawing (b) C) drawing (c) D) drawing (d)

Q: A certain liquid has a density of 1.25 g/cm3. Which drawing below most closely represents the volume of this liquid needed to obtain 5.00 g of the liquid? A) drawing (a) B) drawing (b) C) drawing (c) D) drawing (d)

Q: Liquids A, B, and C are insoluble in one another (i.e., they are immiscible). A, B, and C have densities of and respectively. Which drawing represents the result of placing all three liquids into the same graduated cylinder? A) drawing (a) B) drawing (b) C) drawing (c) D) drawing (d)

Q: The LD50 values for several chemicals are listed below. These chemicals were tested on laboratory mice. Which was the least toxic to the mice in small amounts? A) aspirin 1.5 g/kg B) chloroform, 3.2 g/kg C) ethyl alcohol, 10.6 g/kg D) sodium cyclamate, 17 g/kg

Q: The LD50 values for several chemicals are listed below. These chemicals were tested on laboratory mice. Which was the most toxic to the mice in small amounts? A) aspirin 1.5 g/kg B) chloroform, 3.2 g/kg C) ethyl alcohol, 10.6 g/kg D) sodium cyclamate, 17 g/kg

Q: You are visiting the planet Lagmom. The money exchange rates are shown below. How many Lagmom fizzbarts will you receive in exchange for $500 at the Lagmom Spaceport Currency Exchange counter? A) 5.00 102 fizzbarts B) 1.00 103 fizzbarts C) 1.00 104 fizzbarts D) 5.00 105 fizzbarts

Q: One year is equivalent to A) 2.91 ps B) 3.15 ns C) 3.25 ms D) 2.91 fs

Q: An international group of zookeepers with successful breeding programs made the following animal exchanges last year. Using the same bartering system, how many oryxes can a zoo obtain in exchange for 15 flamingos? A) one oryx B) three oryxes C) four oryxes D) five oryxes

Q: A fishing boat accidentally spills 15 barrels of diesel oil into the ocean. Each barrel contains 42 gallons. If the oil film on the ocean is 2.5 102 nm thick, how many square meters will the oil slick cover? A) 9.5 10-3 m2 B) 9.5 106 m2 C) 9.5 107 m2 D) none of these

Q: If 1.4% of the mass of a human body is calcium, how many kilograms of calcium are there in a 173-pound man? A) 1.1 kg Ca B) 5.3 kg Ca C) 1.1 102 kg Ca D) 5.3 102 kg

Q: An automobile uses gasoline at a rate of 35 mi/gal, which is the same as ________ km/L (1 km = 0.6214 mi, 1 gal = 3.78 L). A) 5.8 B) 15 C) 82 D) 210

Q: To the correct number of significant figures, an automobile traveling at 28 mi/h is traveling at ________ km/h (1 km = 0.6214 mi). A) 17 B) 17.40 C) 45 D) 45.06

Q: Each of the numbers in the following calculation represents a quantity measured by a student in the laboratory. g = 0.0220 12.0 After performing the calculation, the student's calculator appeared as shown below: To the correct number of significant figures what is the value of g? A) 6 10-3 B) 6.0 10-3 C) 6.00 10-3 D) 6.000 10-3

Q: Each of the numbers in the following calculation represents a quantity measured by a student in the laboratory. P = After performing the calculation, the student's calculator appeared as shown below: To the correct number of significant figures what is the value of P? A) 2 B) 2.43 C) 2.430 D) 2.430094

Q: Round off 507,506 to three significant figures. A) 507 B) 508 C) 5.07 105 D) 5.08 105

Q: Round off 507,506 to four significant figures. A) 5075 B) 5076 C) 5.075 105 D) 5.076 105

Q: A propane molecule contains 3 atoms of carbon. The number 3 represents how many significant figures? A) one B) two C) three D) infinite

Q: How many significant figures are there in the answer for the following problem? = ? A) one B) two C) three D) four

Q: How many significant figures are there in the answer for the following problem? 23.1 + 0.5588 + 17 = ? A) one B) two C) three D) four

Q: What is the answer for the following multiplication when the correct number of significant figures are used? 23.8216 81.66 = ? A) 1945 B) 1945.271856 C) 1.95 1 D) 1945.27

Q: How many significant figures are there in the answer to the following problem? (8.881 2.100) + 0.590 = ? A) one B) two C) three D) four

Q: How many of the following numbers contain 3 significant figures? 0.105 6.010 0.0100 8.00 102 A) one B) two C) three D) four

Q: The measured mass of a sample of iron was 1.23 g. Which digit in the measurement has the least certainty? A) the first digit, 1 B) the middle digit, 2 C) the last digit, 3 D) They are all certain digits.

Q: Which of the following is an exact number? A) 0.507 grams B) 1.13 liters C) 2 people D) 5.37C

Q: Which of the following numbers has the greatest number of significant figures? A) 0.5070 B) 0.201 C) 418000 D) 6.02 1024

Q: A student measured the diameter of a sphere and determined the average value. His measurements are and If the true diameter is 6.18 cm, what can be said about the student's results? A) It is accurate and precise. B) It is accurate but not precise. C) It is precise but not accurate. D) It is neither precise nor accurate.

Q: The nutritional calorie (abbreviated Cal) is equal to A) 1 mcal. B) 4.184 J. C) 4.184 cal. D) 1 kcal.

Q: The average mass of an oxygen atom is 5.3 10-26 kg. Calculate the kinetic energy of a mole of oxygen atoms, all moving at a speed of 400 m/s (1000 mph). K. E. = . A) 8.2 10-21 J B) 2600 J C) 5200 J D) 13,000 J

Q: Calculate the kinetic energy of a 150-g baseball moving at a speed of 40. m/s (89 mph). K. E. = . A) 6.0 J B) 1.2 102 J C) 6.0 103 J D) 1.2 105 J

Q: A piece of plastic weighing 1.157 g has a volume of 1.48 cm3. A piece of wood has the same volume but weighs 3.85 g. The density of liquid X is 0.765 g/mL and the density of liquid Z is 1.13 g/mL. The two liquids are immiscible. If the plastic and wood are added to the two liquids, what is the order of layers from top to bottom in the container? A) liquid X, liquid Z, plastic, wood B) liquid X, plastic, liquid Z, wood C) plastic, wood, liquid Z, liquid X D) wood, liquid Z, plastic, liquid X

Q: Specific gravity of a liquid is often defined as the ratio of the density of a substance to the density of water. If the specific gravity of X relative to water is 0.800 and the specific gravity of Y relative to water is 1.50, which of the following statements is false? A) If X is a liquid, Y will float on X. B) If X is a solid, X will float in water. C) If Y is a liquid, water will float on Y. D) If Y is a liquid, X will float in Y.

Q: Because of the high heat and low humidity in the summer in Death Valley, California, a visitor requires about one quart of water for every two miles traveled on foot. If the density of water is 0.990 g/mL at 45C, how many kilograms of water are required for a person to walk 30 kilometers in Death Valley? A) 8.7 kg B) 70 kg C) 3.5 102 kg D) 7.0 102 kg

Q: A mass of mercury occupies 0.750 L. What volume would an equal mass of ethanol occupy? The density of mercury is and the density of ethanol is 0.789 g/mL. A) 0.0437 L B) 0.0777 L C) 12.9 L D) 22.9 L

Q: The volume of a well is 40.0 ft3. How many kilograms of concrete will it take to fill the well if the density of concrete is 2.85 g/cm3? A) 3.47 kg B) 3.23 103 kg C) 3.47 103 kg D) 3.23 106 kg

Q: The estimated mass of the planet Jupiter is 1.90 1027 kg and the density is believed to be 1.34 g/cm3. If Jupiter were a perfect sphere, what would be its diameter? For a sphere, V = 4/3 π. A) 6.96 106 m B) 6.96 107 m C) 1.39 107 m D) 1.39 108 m

Q: A gold ingot weighs 5.50 lbs. If the density of gold is 19.31 g/cm3, and the length and width of the ingot are 12.0 cm and 3.00 cm respectively, what is the height of the ingot? A) 6.50 10-3 cm B) 3.59 cm C) 10.2 cm D) 1.34 103 cm

Q: The density of aluminum is 2.702 g/cm3. What is the final liquid level of water if 1.130 ounces of aluminum is dropped into a graduated cylinder containing 15.90 mL of water? A) 17.08 mL B) 21.66 mL C) 27.76 mL D) 47.95 mL

Q: A piece of metal ore weighs 8.25 g. When a student places it into a graduated cylinder containing water, the liquid level rises from 21.25 mL to 26.47 mL. What is the density of the ore? A) 0.312 g/mL B) 0.633 g/mL C) 1.58 g/mL D) 3.21 g/mL

Q: Which of the following is the smallest volume? A) 44 cm3 B) 1.0 dL C) 5.5 103 mL D) 1 108 nL

Q: Convert 15 m3 to liters. A) 1.5 10-2 L B) 1.5 L C) 1.5 102 L D) 1.5 104 L

Q: Convert 100 cm3 to m3. A) 1 10-4 m3 B) 1 100 m3 C) 1 104 m3 D) 1 108 m3

Q: Which of the following volumes is equal to 10 mL? A) 10 cm3 B) 10 dm3 C) 0.10 L D) 0.00010 kL

Q: One liter is approximately the same as one U.S. A) ounce. B) pint. C) quart. D) gallon.

Q: The nighttime and daytime temperatures on Mercury are 13 K and 683 K respectively. The melting point and boiling point of sulfur is 246F and 832F. Which of the following statements is true? On Mercury sulfur exists A) only in the liquid state. B) only in the solid state. C) as both a liquid and a gas. D) as both a liquid and a solid.

Q: The freezing point of methane is -295F and the boiling point is -263F. The temperature of the surface of Titan, a moon of Saturn, is 93 K. If methane exists on Titan, it is A) a gas. B) a liquid. C) a solid. D) a plasma.

Q: Which one of the following statements about temperature scales is false? A) The boiling point of water on the Fahrenheit scale is 212 degrees. B) The Celsius degree is smaller than the Fahrenheit degree. C) The freezing point of water on the Celsius scale is 0 degrees. D) All temperatures on the Kelvin scale are positive numbers.

Q: Which of the following is the lowest temperature? A) 37C B) 54F C) 313 K D) All of these temperatures are all equal.

Q: If the melting point of titanium metal is 1672C, what is its melting point in Kelvins? A) 897 K B) 1399 K C) 1945 K D) 3042 K

Q: What is the coldest temperature possible? A) 0C B) 0F C) 0 K D) none of these

Q: The diameter of the nucleus of an atom is approximately 1 10-15 meters. If 1 nm is equal to 10 what is the diameter of the nucleus in A) 1 10-23 B) 1 10-8 C) 1 10-7 D) 1 10-5

Q: The diameter of an atom is approximately 1 10-10 m. What is the diameter in millimeters? A) 1 10-16 mm B) 1 10-13 mm C) 1 10-7 mm D) 1 10-4 mm

Q: The average distance between nitrogen and oxygen atoms is 115 pm in a compound called nitric oxide. What is this distance in centimeters? A) 1.15 10-9 cm B) 1.15 10-8 cm C) 1.15 1012 cm D) 1.15 1016 cm

Q: Convert 1 μm to meters. A) 1 10-9 m B) 1 10-6 m C) 1 10-3 m D) 1 106 m

Q: The thickness of a U.S. dime is approximately one A) m. B) cm. C) mm. D) μm.

Q: The number of cm in 1.0 in is closest to ________. A) 1.0 B) 1.5 C) 2.0 D) 2.5

Q: A student weighed 3000. μg of sulfur in the lab. This is the same mass as A) 3.000 10-6 g. B) 3.000 10-3 kg. C) 3.000 103 mg. D) 3.000 106 ng.

Q: The mass of a single copper atom is 1.055 10-22 g. This is the same mass as A) 1.055 10-16 mg. B) 1.055 10-25 kg. C) 1.055 10-28 μg. D) 1.055 10-31 ng.

Q: The mass of a proton is 1.67 10-27 kg. What is the mass of a proton in Gigagrams? A) 1.67 10-39 Gg B) 1.67 10-36 Gg C) 1.67 10-33 Gg D) 1.67 10-30 Gg

Q: Which of the following is the greatest mass? A) 1000 μg B) 1.000 10-4 kg C) 1.000 10-2 cg D) 1.000 10-8 Mg

Q: One gram is approximately the same as half the mass of a new U.S. A) penny. B) dime. C) quarter. D) dollar.

Q: One kilogram is slightly more than ________ U.S. pounds? A) 0.5 B) 1 C) 2 D) 5

Q: When measuring a solid metal block at constant temperature, which measurement will change in numerical value depending on the location where it is taken? A) length B) mass C) volume D) weight

Q: An astronaut uses a laboratory balance and weighs an object on earth and again on the moon. Which statement below about the weight and mass of the object is true? A) The mass and weight will be identical on the earth and the moon. B) The mass will be the same on earth and moon but the weight will be less on the moon. C) The weight will be the same on earth and moon but the mass will be less on the moon. D) Both the mass and weight will be different on earth and moon.

Q: Without using a calculator, solve the following problem: A) 1 100 B) 1 10-3 C) 1 10-9 D) 1 10-12

Q: Without using a calculator, solve the following problem: A) 1 10-6 B) 1 104 C) 1 1024 D) 1 1034

Q: A sailor circumnavigated the earth and covered 4,264,000 meters. Express this number in standard scientific notation. A) 4.264 10-7 m B) 4.264 10-6 m C) 4.264 106 m D) 4.264 107 m

Q: Convert 0.003002 to standard scientific notation. A) 3.002 10-3 B) 3002 10-6 C) 3.002 103 D) 3002 106