1) How many significant figures are in the measurement, 263.900 m? 1) 2) What wa
ID: 545709 • Letter: 1
Question
1) How many significant figures are in the measurement, 263.900 m? 1) 2) What wavelength of light would you report in units of nm, if the light had a wavelength of 2) 1.65 x 10-10 m? A) 1.65 x 10-19 nm B) 1.65 x 10-3 nm C) 0.165 nm D) 1.65 nm E) 165 nm 3) Identify a gas. 3) A) iron B) mercury C) silver D) hydrogern E) phosphorus 4) Which of the following are examples of physical change? 4) A) Ice melts. B) Dry ice sublimes. C) Powdered fruit drink is dissolved in water D) Coffee is brewed E) All of these are examples of physical change. 5) Choose the pure substance from the list below 5) A) wine B) lemonade C) juice D) air E) salt 6) Which of the following statements is TRUE? 6) A) A scientific law summarizes a series of related observations B) A hypothesis is speculation that is difficult to test C) Once a theory is constructed, it is considered fact. D) An observation explains why nature does something. E) A scientific law is fact 7) A mass of mercury occupies 0.950 L. What volume would an equal mass of ethanol occupy? The7) density of mercury is 13.546 g/mL, and the density of ethanol is 0.789 g/mL A) 0.0613 L B) 0.0553 L C) 18.1L D) 16.3L 8) Identify absolute zero. A) 212 degrees Fahrenheit C) 0.00 degrees Celsius B) -273 degrees Celsius D) None of the aboveExplanation / Answer
1)
All the digits are significant here
there are 6 significant figures
Answer: E
2)
1.65*10^-10 m = 1.65*10^-10*10^9 nm
= 0.165 nm
Answer: C
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