Chemistry 120 (Exam 1) Questions with
verified answers
What is Chemistry? - Correct answer. The Study of composition, structure, properties, and reactions of
matter
Chemical: - Correct answer. A substance that always has the same composition and properties wherever
it is found.
The Scientific Method? 6 steps - Correct answer 1.) Ask a question
2.) Background Research
3.) Create a Hypothesis (testable statement)
4.) Test Hypothesis
5.) Analyze Data
6.) Report Results
What is the difference between a theory and a law? - Correct answer - theory is not proven
- law is a pattern in nature; Proven and never changes
Scientific Notation: - Correct answer N x 10^x
Metric System Example - Correct answer Length: Meter
Si Unit example - Correct answer Length: m
Volume: - Correct answer Amount of space a substance occupies
Mass: - Correct answer a measure of the quantity of material an object contains
Temperature: - Correct answer measure of the amount of heat energy in the object
, Measured numbers: - Correct answer the number you obtain when you measure a quantity (height,
weight, temp, etc.)
Significant Figures: - Correct answer The number of digits that express the result to the true measured
precision
When addition or subtraction is performed: - Correct answer answers are rounded to the least
significant DECIMAL PLACE
When multiplication or division is performed: - Correct answer answers are rounded to the LEAST # of
SIG FIGS
Exact Numbers: - Correct answer those numbers obtained by counting items or using a def that
compares two units in the same measuring system
Common units for density?
A-solids?
B-liquids?
C-gases? - Correct answer A- g/cm3
B- g/ml
C- g/L
The HIGHER the density - Correct answer The more it sinks
Solid: - Correct answer -ordered packing, usually crystal lattice
-particles are close together
- definite shape and volume
Liquid: - Correct answer - less ordered packing
verified answers
What is Chemistry? - Correct answer. The Study of composition, structure, properties, and reactions of
matter
Chemical: - Correct answer. A substance that always has the same composition and properties wherever
it is found.
The Scientific Method? 6 steps - Correct answer 1.) Ask a question
2.) Background Research
3.) Create a Hypothesis (testable statement)
4.) Test Hypothesis
5.) Analyze Data
6.) Report Results
What is the difference between a theory and a law? - Correct answer - theory is not proven
- law is a pattern in nature; Proven and never changes
Scientific Notation: - Correct answer N x 10^x
Metric System Example - Correct answer Length: Meter
Si Unit example - Correct answer Length: m
Volume: - Correct answer Amount of space a substance occupies
Mass: - Correct answer a measure of the quantity of material an object contains
Temperature: - Correct answer measure of the amount of heat energy in the object
, Measured numbers: - Correct answer the number you obtain when you measure a quantity (height,
weight, temp, etc.)
Significant Figures: - Correct answer The number of digits that express the result to the true measured
precision
When addition or subtraction is performed: - Correct answer answers are rounded to the least
significant DECIMAL PLACE
When multiplication or division is performed: - Correct answer answers are rounded to the LEAST # of
SIG FIGS
Exact Numbers: - Correct answer those numbers obtained by counting items or using a def that
compares two units in the same measuring system
Common units for density?
A-solids?
B-liquids?
C-gases? - Correct answer A- g/cm3
B- g/ml
C- g/L
The HIGHER the density - Correct answer The more it sinks
Solid: - Correct answer -ordered packing, usually crystal lattice
-particles are close together
- definite shape and volume
Liquid: - Correct answer - less ordered packing
