{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

chm 2045 exam 1 key

# chm 2045 exam 1 key - CHM 2045 Exam 1(Form Code A...

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

CHM 2045 Exam 1 (Form Code A) September 22, 2007 Instructions: On your scantron sheet enter your name, UF ID number (start on the first space and leave the last space blank), Discussion Section No. and Form Code (see above). This exam consists of 25 multiple choice questions each worth 10.0 points for a total maximum of 250 pts. You may retain your exam sheet (mark your answers on it and the scantron sheet). Turn in only the scantron. Bubbling errors of any kind will count as an incorrect response or result in the loss of points. 1. An auto bumper is coated with a layer of chromium, 0.017 cm thick. The bumper has a surface area of 3.43 x 10 4 cm 2 . The density of chromium metal is 7.19 g/cm 3 . How many atoms of chromium are used in the coating? (1) 81 (2) 5.8 x10 2 (3) 4.2 x 10 3 (4) 4.9 x 10 25 (5) 2.5 x 10 27 2. An Erlenmeyer flask weighs 241.3 g when empty. When filled with water (density = 1.00 g/cm 3 ), the flask and its contents weigh 489.1 g. How much does the flask weigh when filled with chloroform (density of chloroform = 1.48 g/cm 3 )? (1) 367 g (2) 248 g (3) 489 g (4) 608 g (5) 695 g 3. The density of carbon tetrachloride is 1.59 g/mL. How many chlorine atoms are present in 55 mL of carbon tetrachloride? (1) 3.3 × 10 23 atoms (2) 5.4 × 10 23 atoms (3) 1.4 × 10 24 atoms (4) 8.1 × 10 27 atoms (5) 3.2 × 10 28 atoms 4. An electron moves in a vacuum between two oppositely-charged parallel plates, initially on a path between and parallel to the two plates. How will the electron be deflected?

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

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

### What students are saying

• As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

Kiran Temple University Fox School of Business ‘17, Course Hero Intern

• I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

Dana University of Pennsylvania ‘17, Course Hero Intern

• The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

Jill Tulane University ‘16, Course Hero Intern