101pex1 - 1 1 The symbols for silicon arsenic bromine...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
1 1. The symbols for silicon, arsenic, bromine, barium and cobalt are: a) Si, As, Br, Ba, Cl b) Sn, As, Bo, Br, Co c) Sn, Ar, Bo, Br, Cl d) Si, Ar, Br, Bi, Ca e) Si, As, Br, Ba, Co 2. Which of the following statements is INCORRECT ? a) If only one substance is present the material must be uniform throughout. b) Some pure substances can be decomposed into simpler pure substances. c) Every compound is a pure substance. d) Heterogeneous mixtures may not contain elements. e) A heterogeneous mixture may contain three substances. 3. Examine the following group of elements. (a number) of them are nonmetals and of them are semimetals (metalloids). Li S 54 Xe 33 As Cu 49 In 78 Pt P 51 Sb a) 3, 4 b) 3, 2 c) 2, 3 d) 3, 3 e) 4, 2 4. Choose from the following list those properties that are physical properties of sulfur . A. Its melting point is 112°C. B. It is a yellow solid. C. It reacts with hydrogen to form a gas. D. Its density is 2.97 g/cm 3 . E. It combines with oxygen. a) C, E b) A, B c) A, D d) B, C e) A, B, D 5. How many of the following numbers have 4 significant figures? 3.0156 18.00 0.1070 3.45 x 10 4 0.0021 a) 1 b) 2 c) 3 d) 4 e) 5 6. Express the quantity 0.05750 g in mg rounded to the nearest mg (the units place). a) 57.5 b) 575 c) 58 d) 57 e) 5.80 x 10 2
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
2 7. Do the indicated arithmetic and give the answer to the correct number of significant figures. (5.159 + 82.30) x (0.024 + 3.00) a) 264.2 b) 264.25 c) 264 d) 2.6 x 10 2 e) 3 x 10 2 8. Consider the data obtained for the length of an object as measured by three students. The length is known to be 14.54 cm. Which of the conclusions summarizes the data? trial 1 trial 2 trial 3 trial 4 trial 5 Student A 14.8 14.2 14.5 14.7 14.3 Student B 14.7 14.8 14.9 14.8 14.7 Student C 14.4 14.4 14.8 14.9 14.8 a) student B has done the most precise work and student A the most accurate b) student B has done the most precise work and student C the most accurate c) student C has done the most precise work and student B the most accurate d) student C has done the most precise work and student A the most accurate e) student A has done the most precise work and student C the most accurate 9. Which of the following metric relationships is IN correct ? a) 1 nanoliter = 10 -9 liters b) 1 kilometers = 10 4 decimeters c) 1000 millimeters = 1 meter d) 1 kiloliter = 10 6 milliliters e) 1 milligram = 10 -3 micrograms 10. The calcium content of blood is 0.096 mg/mL. How many grams of calcium are in 0.100 L of blood?
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

Page1 / 9

101pex1 - 1 1 The symbols for silicon arsenic bromine...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online