Chem 120 week 1, exam 1 Questions and Correct AnswersChem 120 week 1, exam 1 Questions and Correct Answers
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Course
Chem 120
Institution
Chem 120
What is Dalton's atomic theory?
~ 1) All matter is made of atoms. Atoms are indivisible and indestructible.
2) All atoms of a given element are identical in mass and properties
3) Compounds are formed by a combination of two or more different kinds of atoms.
What is a physical change?
~ A chan...
Chem 120 week 1, exam 1 Questions
and Correct Answers
Scientific Method- what is Observation ?
✓✓~ First step in the scientific method. Information gathered from our senses. Can use tools to
help observe
A tentative explanation that is testable and can be written as an if or then statement?
✓✓~ Hypothesis
Well controlled process used to test a hypothesis. Effort is made
to have only one independent variable to study a clear cause and
effect relationship?
✓✓~ Experiment
What scientist control in a experiment is called?
✓✓~ Independent variable
depends on the independent variable, what is measured during the experiment?
✓✓~ dependent variable
A group or condition with a known response or outcome is called?
, ✓✓~ Positive control
A condition with no response expected is called?
✓✓~ Negative control
The data collected from an experiment?
✓✓~ Result
Theory?
✓✓~ well-tested explanation that unifies a broad range of observations
What are the 3 steps to know for Dimensional analysis?
✓✓~ -Put the units you are given on the far left side
-Put the units you want on the far right side
-Use ratios to get from the left side to the
right side.
Common SI Prefixes
✓✓~ Mega (larger than base unit)
- 1,000,000 g = 1 Mg
➢Kilo (larger than base unit) - 1000g=1kg
➢Deci (smaller than base unit) - 10dg=1g
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