Introduction to Chemistry Unit Test and Answers

Introduction to Chemistry Unit Test
Points scored may di er from the grading guidelines because of teacher review. Contact your program teacher if you have any
questions.

Correct Partial Credit Incorrect



1. Which of the following would a chemist be most likely to study? (1 point)

(0 pts) a leaf floating on water
(1 pt) a leaf changing color in autumn
(0 pts) a leaf being blown by the wind
(0 pts) a leaf being eaten by insects

1 /1 point



2. A theory is a ____. (1 point)

(0 pts) proposed explanation for an observation
(1 pt) well-tested explanation for a broad set of observations
(0 pts) summary of the results of many observations
(0 pts) procedure used to test a proposed explanation

1 /1 point



3. The step that usually comes last in solving numeric problems is ____. (1 point)

(0 pts) calculate
(0 pts) measure
(1 pt) evaluate
(0 pts) analyze

1 /1 point



4. The closeness of a measurement to its true value is a measure of its ____. (1 point)

(0 pts) precision
(1 pt) accuracy
(0 pts) reproducibility
(0 pts) usefulness

1 /1 point



5. Which of the following measurements is expressed to three significant figures? (1 point)

(0 pts) 0.007 m
(0 pts) 7077 mg
–7
(1 pt) 7.30 x 10 km
(0 pts) 0.070 mm