Question

please, turn off your cell phone and use only pencil. write your name on the seantron and exam and show the detail of the numerical prblems to get the full credit and turn them in. let me know if you have any questions. exam time is 5:30 to 8:30 pm. multiple choice. choose the one alternative that best completes the statement or answers the question. 1) which of the statements below is not part of the scientific method? a) refinement of a hypothesis as needed b) observation and measurement c) formation of a hypothesis d) testing of a hypothesis by experimentation e) all of the above steps are part of the scientific method. 2) determine the answer to the following equation with correct number of significant figures: (17.103 + 2.03) × 1.02521 = a) 20 b) 19.62 c) 19.6153 d) 19.6 e) none of the above 3) how many milliliters are in 17.5 l? a) 1.75 × 10 - 2 b) 1.75 × 104 c) 175 d) 1.75 × 103 e) none of the above 4) a sample of wood with a mass of 3.0 grams was burned in an open dish. the ashes weighed 1.2 grams. what happened to the rest of the wood? a) nothing, the burned wood simply has a mass of 1.2 grams. b) the remaining 1.8 grams was converted into heat. c) the remaining 1.8 grams was converted into gaseous compounds. d) the remaining mass was destroyed. e) none of the above 5) what is the definition of a scientific theory? a) a brief statement that summarizes past observations and predicts future ones b) a method of learning that emphasizes reason as the way to understand the world c) the equivalent of a scientific opinion which others may disagree with d) a model that explains the underlying reasons for observations and laws e) none of the above

Explanation:

Step1: Solve the arithmetic operation

First, calculate \(17.103 + 2.03=19.133\).

Step2: Multiply the result

Then, multiply \(19.133\times1.102521 = 19.6215\).

Step3: Determine significant figures

The least number of decimal places in the addition (\(17.103+2.03\)) is two (from \(2.03\)). When multiplying, we consider significant figures. \(19.133\) has five significant figures and \(1.02521\) has six. But since the addition result (\(19.133\)) was from numbers with different decimal - place rules (the addition rule for significant figures: keep the least number of decimal places), and then for multiplication, we look at the significant figures of the non - decimal adjusted number. However, another way: \(17.103+2.03 = 19.13\) (rounded to two decimal places as per addition rule). Then \(19.13\times1.02521\approx19.6\) (using significant - figure rules for multiplication: the number with the least number of significant figures in the multiplication. \(19.13\) has four and \(1.02521\) has six, so we round to four. But also considering the initial addition's decimal - place impact).

Answer:

D. 19.6