CHEM 181 Exam 1

• A

• B

• C

• D

The speed of light is 3 x 10^8 m/s. What is this speed in nm/ms?

• 3 x 10^-4 nm/ms

• 3 x 10^2 nm/ms

• 3 x 10^14 nm/ms

• 3 x 10^20 nm/ms

Tags

NGSS.HS-PS4-1

• 1.0 g aluminum

• 5.0 g aluminum

• 1.0 g copper

• 5.0 g copper

• A

• B

• C

• D

Tags

NGSS.HS-PS1-1

Chlorine occurs naturally as a mixture of two isotopes with atomic masses of 34.97 amu and 36.97 amu. What are the relative abundances of these isotopes?

• 24% and 76%

• 50% and 50%

• 76% and 24%

• 95% and 5%

Tags

NGSS.HS-PS1-8

Which sample contains the least number of atoms?

• 1.00 g C

• 1.00 g O2

• 1.00 g H2

• 1.00 g Fe

• A

• B

• C

• D

• 11.58%

• 23.15%

• 34.73%

• 69.46%

Tags

NGSS.HS-PS1-7

A 4.08 g sample of a compound of nitrogen and oxygen contains 3.02 g of oxygen. What is the empirical formula?

• NO2

• NO3

• N3O2

• N2O5

• 1

• 2

• 3

• 6