CHEMISTRY PRACTICE EXAM I

CHEMISTRY PRACTICE EXAM I - Exam 1 Chemistry 1A Summer 2008...

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

View Full Document Right Arrow Icon
Exam 1 Chemistry 1A Summer 2008 J A C EXAM I NAME: __________________ __________________ last first THERE ARE 4 PAGES TO THIS EXAM. Significant Figures must be correct. All set-ups must be shown (where applicable) or you will receive NO credit! The following are constants and conversion factors you may or may not need. mole particles 10 x 6.02 23 2.54 cm = 1 in 1 lb = 454.0 g 1 gal = 3.80 L 1 gal = 4 qt 1 qt = 2 pt ______________________________________________________________________ 1. Calculate the number of H atoms in 2.35g of (NH 4 ) 3 PO 4 . ANSWER: 1.52 X 10 23 H atoms 2. The density of a block of aluminum is 22.5 lb/gal. Express this density in In units of g/cm 3 . ANSWER 2.70 g/cm 3 3. How many protons, neutrons, and electrons are in a xenon-129 atom? Protons 54 Electrons 54 Neutrons 75
Background image of page 1

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

View Full DocumentRight Arrow Icon
4. Silver has two naturally occurring isotopes. The average mass of a silver atom is 107.87 amu. If 51.839 % of silver is found as silver-107 (106.91.91 amu), what is the mass of the other isotope? ANSWER
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.

This note was uploaded on 11/12/2011 for the course CHEM chem 2a taught by Professor Cabrera during the Spring '09 term at San Jose City College.

Page1 / 3

CHEMISTRY PRACTICE EXAM I - Exam 1 Chemistry 1A Summer 2008...

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