SCIN 131 Week 1 quiz

SCIN 131 Week 1 quiz Question 1 of 25 4.0 Points Which of the following is a law? A.The universe began as a cosmic explosion called the Big Bang. B.A stone dropped from an altitude of 450 m falls to the ground in 9.6 s. C.A body in motion stays in motion unless acted upon by force. D.The star closest to Earth is moving away from Earth at high speed. Question 2 of 25 4.0 Points The result of collisions between gas molecules and the surfaces around them is: A.mass B.temperature C.color D.pressure Question 3 of 25 4.0 Points Hydrogen is an example of: A.a molecule. B.a mixture. C.an atom. D.a bond. Question 4 of 25 4.0 Points Which scientist discovered penicillin? A.Feynman B.Fleming C.Dalton D.Lavoisier Question 5 of 25 4.0 Points Which scientist worked on combustion reactions? A. Lavoisier B.Dalton C.Fleming D.Feynman Question 6 of 25 4.0 Points Where can you find chemicals? A.in a chemical stockroom. B. in a hardware store. C. all around you and even inside you. D. all of these. Question 7 of 25 4.0 Points Which characteristic is necessary for success in understanding chemistry? A.all of these are keys to success. B.curiosity. C.mathematical skills. D.asking questions. E.commitment. F.practice. G.not procrastinating. Feedback: Good! Many skills are needed to succeed in chemistry. Question 8 of 25 4.0 Points Water is an example of: A.a molecule. B.a mixture. C.an element. D.an atom. Question 9 of 25 4.0 Points Which statement best defines chemistry? A. The science that studies air and water pollution. B. The science that seeks to understand processes that occur only in chemical laboratories. C. The science that studies solvents, drugs, and insecticides. D. The science that studies the connections between the properties of matter and the particles that compose that matter. Question 10 of 25 4.0 Points True or False: You must be able to develop an experiment for your hypothesis, or else it could be considered non-scientific. True False Feedback: Good. This is the scientific method. Question 11 of 25 4.0 Points According to the scientific method, what is a law? A.An initial guess with explanatory power. B.A model that gives insight into how nature is. C.A short statement that summarizes a large number of observations. D.A fact that can never be refuted. Feedback: See section 1.4 in the text. This is the scientific method. Question 12 of 25 4.0 Points A tentative explanation for a set of observations that can be tested by further experimentation is referred to as: A.a hypothesis. B.a theory. C.a law. D.none of these. Question 13 of 25 4.0 Points What is the very first step in acquiring scientific information, not just in chemistry, but in all of science? A. conduct an experiement B. all of these are good places to start C. make an observation or ask a question D. form a hypothesis E. draw a conclusion Feedback: Good. This is the first step in the scientific method. Part 2 of 2 - Part 2 48.0 Points Question 14 of 25 4.0 Points How many significant figures are in the number 0.01020? A.2 B.5 C.6 D.3 E.4 Question 15 of 25 4.0 Points Which of the following balances has the least uncertainty? A.electronic balance, +/-0.001 g B.analytical balance, +/-0.0001 g C. all balances have the same uncertainty. D. platform balance, +/-0.1 g E.triple-beam balance, +/-0.01 g Question 16 of 25 4.0 Points The correct scientific notation for the number 50.00 is: A.5.000 × 101 B.5.00000 × 102 C.5 × 10-2 D.5 × 104 E. none of the above Feedback: Good. Scientific notation is discussed in section 2.2 of the text. Question 17 of 25 4.0 Points Which of the following statement is wrong concerning the significant digits? A. Four significant digits in 2.1870 x 102 B. Three significant digits in 1.03 C. Four significant digits in 0.05000 D. Five significant digits in 53.410 E. Three significant digits in 0.00405 Question 18 of 25 4.0 Points `The correct number of significant figures in the number 90 is: A.7 B.5 C.6 D.ambiguous E.none of the above Feedback: Sig figs are discussed in section 2.3 of the text. Question 19 of 25 4.0 Points When the value 98.54 is rounded to two significant figures, the number should be reported as: A.98 B.98.5 C.99 D.100 E.none of the above Feedback: Good. Rounding associated with sig figs is discussed in section 2.4 of the text. Question 20 of 25 4.0 Points The correct prefix for the multiplier 1,000,000,000,000 is: A.mega B.tera C.giga D.milli E.none of the above Feedback: Good. Prefixes are discussed in section 2.5 of the text. Question 21 of 25 4.0 Points Liquids A, B, and C are insoluble in one another (i.e., they are immiscible). A, B, and C have densities of 0.998 g/cm3, 1.050 g/cm3, and 1.102 g/cm3, respectively. Which drawing represents the result of placing all three liquids into the same graduated cylinder? A.d B.b C.c D.a Question 22 of 25 4.0 Points What is the volume in mL of a cube of water with dimensions 11.0 cm × 11.0 cm × 11.0 cm ? A.1.33 × 103 B.1.3 × 103 C.1.33 × 10-3 D.1.331 × 10-3 E.none of the above Feedback: This is discussed in section 2.8 in the text. Question 23 of 25 4.0 Points Which pair below would not be able to be convereted to the same unit and thus be UNABLE to be added together? A. grams and milligrams B. pounds and kilograms C. miles and kilometers D.centimeters and yards E.kilograms and kilometers Feedback: Good. This is a basic conversion problem. Question 24 of 25 4.0 Points An American Golden Dollar coin has a mass of approximately 8.1 grams. Which of the following represents an equivalent mass? A. 8,100 centigrams B. none of the above C.0.0081 kilograms D. 81,000 milligrams E.0. micrograms Feedback: Good! This involves metric prefixes. Question 25 of 25 4.0 Points There are exactly 12 items in 1 dozen. When using this conversion factor, how many significant figures are you limited to?