Practice Exam 1

Practice Exam 1 - General Chemistry I Exam #1 Chapters 1,...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
General Chemistry I Exam #1 Chapters 1, 2, 3 Summer 2009 #1. An irregular shaped piece of lead weighs 10.0g. It is carefully lowered into a graduated cylinder containing 30.0 mL of ethanol, and it sinks to the bottom of the cylinder. To what volume reading does the ethanol rise? The density of lead is 11.34 g/mL. a) The volume doesn’t change. b) 40.0 mL c) 30.9 mL d) 31.34 mL e) 143.4 mL #2. Which of the following statements describes a chemical change? (1) Salt dissolves when you add it to water. (2) Food is digested and metabolized by your body. (3) Crystalline sugar is ground into a fine powder. (4) When potassium is added to water there is a purplish pink flame and the water becomes alkaline (basic). a) 1 b) 2 c) 3 d) 2+4 e) 4 #3. Which of the following statements is incorrect ? a) Polluted air is a heterogeneous mixture. b) The composition of a sample of a homogeneous mixture is constant. c) Different samples of a homogeneous mixture can have different concentrations. d) Compounds can be decomposed into its corresponding elements by a physical method. e) All of the above statements are correct. #4. How many micrometers are there in 8.345x10 -7 km? a) 8.345x10
Background image of page 1

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

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 4

Practice Exam 1 - General Chemistry I Exam #1 Chapters 1,...

This preview shows document pages 1 - 2. Sign up to view the full document.

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