Name: American River College Chemistry 310 Exam #1 Spring 2017
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1 Name: American River College Chemistry 310 Exam #1 Spring ). Which of the following is not a step in the scientific method? a. Make an observation. b. Formulate a hypothesis. c. Perform an experiment. d. Change results to agree with your hypothesis. E) Develop a theory (or model). 2) Chemistry is the science that deals with. a. materials of the universe b. the changes that materials undergo c. only microscopic phenomena d. complex systems e. both A and B Answer: E 3) Which of the following is an example of a physical change? a. water boiling and being converted into steam b. water being electrolyzed and being converted in hydrogen and oxygen c. iron metal reacting with oxygen to form rust d. a candy bar being digested by a student e. charcoal being converted into ash Answer: A 4) Which of the following is not a chemical change? a. a rock being crushed to powder b. grass growing c. grape juice turning into wine d. a loaf of bread growing mold e. wood burning to ash Answer: A 5) Express in scientific notation. a b c d e ) Express in scientific notation. a
2 b c d e ANSWER: b 7) The number expressed in scientific notation is a b c d e ) The SI prefix that corresponds to a factor of is a. pico b. deci c. kilo d. micro E) none of these ANSWER: A 9) One inch is equal to how many centimeters (cm)? a cm b cm c cm d cm e cm ANSWER: B 10) What is the symbol for the metric unit micrometer? a. cm b. mm c. Mm d. µm e. none of the above Answer: D 11) What is the symbol for the metric unit megameter? a. cm b. mm c. Mm
3 d. µm e. none of the above Answer: C 12) What is the name corresponding to the metric symbol µl? a. megaliter b. umiliter c. microliter d. ultraliter e. none of the above Answer: C 13) Order the four metric prefixes from smallest to largest. a. nano- < milli- < centi- < kilob. milli- < nano- < centi- < kiloc. kilo- < centi- < nano- < millid. kilo- < centi- < milli- < nanoe. centi- < nano- < kilo- < milli- ANSWER: a 14) How many significant figures are in the number ? a. 1 b. 2 c. 3 d. 4 e. 5 15) How many significant figures are in the number ? a. 2 b. 3 c. 4 d. 5 e. none of these 16) The number rounded to three significant figures is a b c d e. 14.8
4 ANSWER: e 17) The number rounded to three significant figures is a b c d e ANSWER: a 18) How many significant figures are in the number ? a. 2 b. 4 c. 5 d. 6 e. none of these 19) The state of matter for an object that has neither definite shape nor definite volume is a. solid b. liquid c. gaseous d. elemental e. mixed 20) The state of matter for an object that has both definite volume and definite shape is a. solid b. liquid c. gaseous d. elemental e. mixed ANSWER: a 21) Which of the following involves a chemical change? a. boiling water b. melting ice c. chopping wood d. cooking an egg
5 e. none of these 22) Which of the following is a physical change? a. burning gasoline b. cooking an egg c. decomposing meat d. evaporating water e. rusting iron 23) An example of a chemical change is a. boiling alcohol b. grinding coffee beans. c. digesting a pizza d. coffee spilled on a shirt e. an ice cube melting in a drink 24) Which of the following is an element? a. brass b. salt c. water d. earth e. oxygen ANSWER: e 25) An example of a mixture is a. hydrogen fluoride b. purified water c. gold d. the air in this room e. all of these 26) Water is an example of a. a homogeneous mixture b. a heterogeneous mixture c. a compound
6 d. an element 27) Which of the following is a homogeneous mixture? a. pure water b. gasoline c. jar of jelly beans d. soil e. copper metal ANSWER: b 28) True or false? A solid substance is not considered matter. a. True b. False ANSWER: False 29) Filtration usually involves separating which phases from a mixture? a. solid from liquid b. solid from gas c. liquid from gas d. liquid from liquid e. solid from solid ANSWER: a 30). Which of the following conversion factors is incorrect? a. 1 microliter/1000 nl b. 1 cg/100 g c. 1 L/1000 ml d m/1 km e. 1 kg/10000 dg ANSWER: b 31)BONUS: True or false? A compound can consist of one kind of element. a. True b. False ANSWER: False
7 YOU MUST SHOW YOUR WORK FOR THE FOLLOWING PROBLEMS TO RECEIVE CREDIT Perform the following calculations. Answer with the correct number of significant figures. (Pay attention to adding, subtracting, dividing and/or multiplying) (2 pts each) 2 s.f. 110 x ) ) x x ) d.p ) x ( ) x ) x (2.00) x d.p Perform the following conversions. Answer with the correct number of significant figures(2.5 pts each) 6) 7.88 megaliters (ML) microliters ( L) 7) 312 nanometers (nm) centimeters (cm) 7.88x µl 3.12 x 10-5 cm 8) A person has a mass of g, What is this person's mass in pounds? (1 kg = lb) (3 pts) g x 1kg x lbs = lbs 1000g 1kg 9) What is the Celsius equivalent of K? (2 pts) T c =T k- 273= C 10) Convert: C = F. (2 pts) TF = 1.80(TC) + 32 = F 11) Find the volume of an object that has a density of g/ml and a mass of g. (3 pts)
8 V = m = g = D g/ml mL 12) The world s fastest production car is the Shelby SuperCar Ultimate Aero, which can reach top speeds of 422 kilometers per hour. What was its speed in units of meter per second? (5 pts) 117m/s 13) BONUS QUESTION: Do not attempt unless you have completed the rest of the exam!! A container has pounds of carbon tetrachloride inside. If the density of carbon tetrachloride is grams per cm 3, what is the volume of this carbon tetrachloride in units of ft 3? (1lb = kg and L = 1 ft 3 ) (4 pts) lb x ( kg/1lb) x (1000g/1kg) x (1 cm 3 /0.789 g) x (1mL/100cm 3 )(1L/1000mL) (1 ft 3 /28.32L)= ft 3 3 s.f.
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