Lab Final Practice #2 KEY

Lab Final Practice #2 KEY - Lab Final Study Guide Chem 130...

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

View Full Document Right Arrow Icon
Lab Final Study Guide Chem 130 1. Name the location or type of waste container needed by a student to dispose of a few centimeters cubed of a solution of copper (II) nitrate. Heavy metals 2. True-False false In our lab, safety goggles must be worn only when one is working with dangerous experiment chemicals 3. The burets in our lab can be read to the nearest 0.05 mL 4. Is ethanol soluble in water? yes 5. What is the main difference between molarity and molality? Molarity (M) = moles/ L soln , molality (m) = moles/ kg solvent 6. Write the K sp equation for magnesium hydroxide K sp = [Mg +2 ][OH - ] 2 7. If you used 0.25 moles of HCl to titrate the magnesium hydroxide, how many moles of hydroxide ions did you start with? SHOW WORK AND ANSWER 0.25/2 = 0.125 (Mg(OH) 2 + 2HCl = MgCl 2 + 2H 2 O) 8. In studying anions, what would you do (steps) to make sure that precipitation is complete? Add reagent, centrifuge, repeat until no precipitation 9. A student mixes cyclohexane (density=0.8g/mL) and water in a test tube. She does not know which is the bottom layer. The chemical in the bottom layer is water . 10. The radioactive substance, Ba-137m, decays to produce non-radioactive Ba- 137 and gamma rays (atomic # of barium is 56). 11. After plotting all the points on a graph, the slope value was determined to be -
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.

This note was uploaded on 04/09/2009 for the course CHEM 130 taught by Professor Smith during the Fall '08 term at University of Tennessee.

Page1 / 3

Lab Final Practice #2 KEY - Lab Final Study Guide Chem 130...

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