Q&A Hero

Q: What is the correct answer for the calculation of a volume (in mL) with measured numbers ? A) 0.22 mL B) 0.223 mL C) 57 mL D) 14 mL E) 14.3 mL

Q: Which of the answers for the following conversions contains the correct number of significant figures? A) 2.543 m x = 100.1942 in B) 2 L x = 2.12 qt C) 24.95 min x = 0.4158 hr D) 12.0 ft x x = 370 cm E) 24.0 kg x = 11 lb

Q: A calculator answer of 423.6059 must be rounded off to three significant figures. What answer is reported? A) 423 B) 424 C) 420 D) 423.6 E) 423.7

Q: Which of the following examples illustrates a number that is correctly rounded to three significant figures? A) 4.05438 grams to 4.054 grams B) 0.03954 grams to 0.040 grams C) 103.692 grams to 103.7 grams D) 109,526 grams to 109 500 grams E) 20.0332 grams to 20.0 grams

Q: How many significant figures are in the measured number 0.00208 m? A) six B) two C) three D) four E) five

Q: The number of significant figures in the measurement of 45.030 mm is A) none. B) three. C) four. D) five. E) six.

Q: Which of the following measured numbers contains the designated CORRECT number of significant figures? A) 0.04300 - 5 significant figures B) 0.00302 - 2 significant figures C) 156 000 - 3 significant figures D) 1.04 - 2 significant figures E) 3.0650 - 4 significant figures

Q: Which of the following measurements has three significant figures? A) 0.005 m B) 510 m C) 0.510 m D) 0.051 m E) 5100 m

Q: Significant figures are important because they indicate A) the accuracy of a measurement. B) the number of digits on a calculator. C) the number of measurements. D) the precision of a measurement. E) the accuracy of the conversion factor.

Q: The measurement of the gravitational pull on an object is its A) volume. B) weight. C) mass. D) length. E) size.

Q: The amount of space occupied by a substance is its A) mass. B) density. C) weight. D) length. E) volume.

Q: A value of 345 cm is a measure of A) density. B) mass. C) temperature. D) volume. E) distance.

Q: A value of 36 mL is a measure of A) density. B) mass. C) temperature. D) volume. E) distance.

Q: A value of 25 C is a measurement of A) distance. B) volume. C) temperature. D) mass. E) density.

Q: Which of the following is a measurement of temperature in the metric system? A) oz B) lb C) Celsius D) kilogram E) meter

Q: Which of the following is a measurement of mass in the metric system? A) milliliter B) centimeter C) kilogram D) Celsius E) meter

Q: Which of the following is the basic unit of mass in the SI? A) pound B) kilogram C) milligram D) microgram E) gram

Q: The metric unit for volume is the A) meter. B) quart. C) liter. D) pint. E) centimeter.

Q: The metric base unit for length is the A) meter. B) inch. C) millimeter. D) kilometer. E) foot.

Q: Select the correct prefix to complete the equality.A) 1 x 1012B) 1000C) 1D) 0.1E) 0.01F) 0.001G) 1 x 10-12H) 10I) 1001> 1 g = ________ kg2> 1 m = ________ mm3> 1 cm = ________ mm4> 1 dL = ________ mL5> 1 kg = ________ g6> 1 pg = ________ g7> 1 g = ________ pg8> 1 mL = ________ cc

Q: Match the type of measurement to the unit given below.A) volumeB) massC) temperatureD) distanceE) density1> milliliter2> mm3> gram4> 125 K5> kilometer6> milligram

Q: Are the numbers in each of the following statements measured or exact?A) measuredB) exact1> In the U.S. system there are 5280 feet in one mile.2> The patient's blood sugar level is 350 mg/dL.3> There are 452 pages in a book.4> The rabbit weighs 2.5 pounds.5> There are 100 capsules in the bottle.6> I lost 14 pounds on my diet last month.7> 1 liter is equal to 1.06 quarts.8> The patient's temperature is 100.1 F.

Q: Specific gravity has no units.

Q: The density of water is 1 kg/mL.

Q: 1 milliliter is the same as 1000 L.

Q: 1 kilogram is the same as 1000 mg.

Q: A cubic centimeter is a unit of length.

Q: There are 1000 g in a mg.

Q: A g is larger than a mg.

Q: When the measured number 675 is added to the measured number 87.10, the answer should be rounded to the ones place.

Q: When the measured number 0.0090 is multiplied by the measured number 87.10, the answer has two significant figures.

Q: The number 650 000 has two significant figures.

Q: The number 0.0500 has four significant figures.

Q: The liter is a unit of volume in the metric system.

Q: The basic unit of mass in the metric system is the pound.

Q: State the number of significant figures in each of the following measurements. 1> 0.008 090 cm 2> 680 000 km 3> 28.050 km 4> 0.0005 L 5> 75.00 m 6> 2.043 x 104 mm 7> 6.1 x 10-5 mL 8> 9.00 x 106 g

Q: Express each of the following numbers using scientific notation. 1. 351 000 000 000 2. . 0.000 860 3. . 5 207 000 4. . 0.000 000 050

Q: In the number 45.678, the digit 6 is in the ________ place.

Q: The second step in the scientific method is to ________.

Q: The first step in the scientific method is to ________.

Q: The chemical used to make cans and foil is ________.

Q: Substances which prevent spoilage are called ________.

Q: The substances released when tissues are injured are ________.

Q: An abrasive used in toothpaste is ________.

Q: Any material used in or produced by a chemical reaction is a ________.

Q: A substance that consists of one type of matter and always has the same composition and properties is called a ________.

Q: 2.25 x 10-4 is equal to 22500.

Q: 3.5 x 103 is equal to 3500.

Q: If a negative number is divided by another negative number, the answer will be a positive number.

Q: When -7 is added to -5 the answer is 12.

Q: In the number 123.45, the digit 5 is in the hundreds place.

Q: It is a good idea to wait until the night before an exam to start to study.

Q: Keeping a problem notebook will help you do well in your chemistry class.

Q: Working with a group of students can help you learn chemistry.

Q: Doing experiments to test your hypothesis is part of the scientific method.

Q: The first step in the scientific method is to draw a conclusion.

Q: Paracelsus was a Greek philosopher.

Q: Calcium carbonate is used to sweeten toothpaste.

Q: Titanium dioxide in toothpaste is used as a detergent.

Q: Written in scientific notation, 0.000 004 03 is A) 4.03 x 10-7. B) 4.03 x 10-6. C) 4.03 x 106. D) 0.403 x 10-5. E) 4.03.

Q: Written in scientific notation, 0.000 000 33 is A) 3.3 x 107. B) 3.3 x 10-7. C) 3.3 x 10-8. D) 3.3 x 108. E) 3.3.

Q: Written in scientific notation, 8300 is A) 8.3 x 102. B) 8.3 x 103. C) 8.3 x 104. D) 8.3 x 10-3. E) 8.3 x 10-2.

Q: Written in scientific notation, 540 000 is A) 0.54 x 106. B) 54 x 108. C) 5.4 x 10-5. D) 5.4 x 105. E) 5.4.

Q: 16 is what percent of 80? A) 200% B) 20% C) 2% D) 5% E) 50%

Q: 12 is what percent of 36? A) 3% B) 30% C) 33% D) 330% E) 12%

Q: For the equation -10 - (-4) = A) 6. B) -6. C) 14. D) -14. E) 4.

Q: For the equation 4x + 2 = 10 , x equals A) 8. B) 12. C) 3. D) 2. E) -2.

Q: The product of (-4) x (-5) is A) -20. B) +20. C) -1. D) +1. E) 0.

Q: In the number 12.345, the 3 is in the ________ place. A) tens B) ones C) tenths D) hundredths E) thousandths

Q: In the number 12.345, the 1 is in the ________ place. A) tens B) ones C) tenths D) hundredths E) thousandths

Q: In the number 12.345, the 4 is in the ________ place. A) tens B) ones C) tenths D) hundredths E) thousandths

Q: Which of the following would not be part of a study plan to learn chemistry? A) study a little every day B) skip your instructor's office hours C) form a study group D) read the chapter before class E) work the sample problems

Q: In order to enhance your learning in chemistry, you should not A) study a little every day. B) form a study group. C) go to office hours. D) be an active learner. E) wait until the night before the exam to study.

Q: One way to enhance your learning in chemistry is to A) study a little every day. B) form a study group. C) go to office hours. D) be an active learner. E) all the above

Q: There is more traffic between 8 and 9 in the morning because most people start work at 9. This would be a(n) A) observation. B) hypothesis. C) experiment. D) theory. E) all the above

Q: You notice that there is more traffic between 8 and 9 in the morning. This would be a(n) A) observation. B) hypothesis. C) experiment. D) theory. E) all the above

Q: Which of the following is a chemical? A) sugar B) heat C) light D) noise E) a wave

Q: When a part of the body is injured, substances called ________ are released. A) aspirins B) pain relievers C) nitrogen oxides D) chlorofluorocarbons E) prostaglandins

Q: Titanium dioxide is a chemical used in toothpaste to A) make the paste white. B) disinfect the toothbrush. C) keep the paste from spoiling. D) remove plaque. E) strengthen tooth enamel.

Q: Sodium fluorophosphate is a chemical used in toothpaste to A) make the paste white. B) disinfect the toothbrush. C) keep the paste from spoiling. D) remove plaque. E) strengthen tooth enamel.