CHEM 120 Exam 1 Review
Week 1 Topics:
Scientific method
Hypothesis: A testable explanation.
Independent variable: What you as the scientist are controlling or changing.
Dependent variable: Depends on the independent variable. What you expect to change. What
you are measuring.
Positive control: Group or condition with known outcome.
Negative control: Condition for which no change is expected.
Experimental controls: All the conditions that are held constant.
Dimensional Analysis
DA Tips
• Always, ALWAYS, write your units
• Memorize the conversions (Powerpoint and Edapt)
o Imperial to metric (Gal to L, tsp to ml, etc)
o Metric prefixes (1000 mx = 1 x, 100 cx = 1x)
• Always set up your start and end point before using conversions
Examples:
1. I have a book with a weight of 0.46 lbs. What is the mass of this book in
kg? Answer:
0.46 lbs 1 kg 0.21 kg
2.2 lbs
2. I have a sample of a fluid with a volume of 670 ml. What is the volume of this sample in
gal?
This study source was downloaded by 100000807870346 from CourseHero.com on 05-24-2022 04:48:05 GMT -05:00
https://www.coursehero.com/file/115746868/CHEM120-Exam-1-Review-Guidedocx/
, Answer:
670 ml 1L 1 gal 0.18 gal
1000 mL 3.785 L
3. I have a sample that diffused to a diameter of 0.2 inches. What is this diameter in mm?
This study source was downloaded by 100000807870346 from CourseHero.com on 05-24-2022 04:48:05 GMT -05:00
https://www.coursehero.com/file/115746868/CHEM120-Exam-1-Review-Guidedocx/
Week 1 Topics:
Scientific method
Hypothesis: A testable explanation.
Independent variable: What you as the scientist are controlling or changing.
Dependent variable: Depends on the independent variable. What you expect to change. What
you are measuring.
Positive control: Group or condition with known outcome.
Negative control: Condition for which no change is expected.
Experimental controls: All the conditions that are held constant.
Dimensional Analysis
DA Tips
• Always, ALWAYS, write your units
• Memorize the conversions (Powerpoint and Edapt)
o Imperial to metric (Gal to L, tsp to ml, etc)
o Metric prefixes (1000 mx = 1 x, 100 cx = 1x)
• Always set up your start and end point before using conversions
Examples:
1. I have a book with a weight of 0.46 lbs. What is the mass of this book in
kg? Answer:
0.46 lbs 1 kg 0.21 kg
2.2 lbs
2. I have a sample of a fluid with a volume of 670 ml. What is the volume of this sample in
gal?
This study source was downloaded by 100000807870346 from CourseHero.com on 05-24-2022 04:48:05 GMT -05:00
https://www.coursehero.com/file/115746868/CHEM120-Exam-1-Review-Guidedocx/
, Answer:
670 ml 1L 1 gal 0.18 gal
1000 mL 3.785 L
3. I have a sample that diffused to a diameter of 0.2 inches. What is this diameter in mm?
This study source was downloaded by 100000807870346 from CourseHero.com on 05-24-2022 04:48:05 GMT -05:00
https://www.coursehero.com/file/115746868/CHEM120-Exam-1-Review-Guidedocx/
