38) What type of change is represented by the decay of a fallen tree? 38) A) che

Question

38) What type of change is represented by the decay of a fallen tree? 38) A) chemical B) physical C) analytical D) molecular E) All of the choices are correct 39) What type of property of matter is independent of the quantity of the substance? 39) A) chemical B) extensive C) physical D) intensive E) nuclear 40) 40) What are the two classes of pure substances? A) compounds and molecules B) elements and compounds C) homogeneous and heterogeneous D) elements and atoms E) chemical and physical 41) Which of the following numbers has only one significant figure? 41) A) 0.003 B) 3.00 C)3.0 x 10l D) 30.0 E) All of the choices are correct 42) Consider the following set of numbers. If the true value is 12.6 cm2, which of the 42) following best describes the set of numbers? 12.6 cm2, 12.5 cm2, 12.6 cm2 A) accurate and precise B) accurate but not precise C) not accurate but precise D) neither accurate nor precise E) More information is needed to determine if the measurements are accurate 43) Which temperature scale does not use a degree sign? 43) A) Celsius B) Kelvin C) Centigrade D) Absolute zero E) Fahrenheit

Explanation / Answer

38) Answer is A- chemical change

39) Answer is D -intensive property

40) Answer is B - elements and compounds are the two classes of pure substance

41) Answer is A - 0.003

42) Answer is A -Accurate and Precise

43) Answer is B - kelvin

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