CHEM 130 Exam 1 Test Questions and
Answers 2025-2026 All Reviewed.
Chemistry - Answer Study of matter and the changes that matter undergoes
Matter - Answer Anything that has mass and occupies space
Steps of the Scientific method - Answer 1) Observation
2) Hypothesis
3) Experiment
4) Model (theory)
5) Further experiment or alter model
Quantitative properties - Answer Properties that can be measured (time, temperature, mass,
distance)
Lowest possible temperature on Kelvin scale - Answer 0
Exact number - Answer 1) Defined value
2) Determined by counting
Inexact number - Answer Measured by any method other than counting (length, mass,
volume, time, speed)
Significant figures in addition and subtraction rule - Answer The answer cannot have more
digits to the right of the DECIMAL POINT than any of the original numbers
Significant figures in multiplication and division rule - Answer The answer cannot have more
SIGNIFICANT FIGURES than the original number with the smallest NUMBER of significant figures
Subtance - Answer A form of matter that has definite composition and distinct properties
(Salt, iron, water, carbon dioxide)
, - Does not conform to the shape of its container
Liquid - Answer Particles are close together but are not held rigidly in position; they are free
to move around
- Conforms to the shape of the part of the container it fills
Gas - Answer Particles are separated by distances that are very large
- Assumes both shape and volume of the container
Mixture - Answer A physical combination of two or more substances
Homogeneous mixture - Answer Uniform throughout (aka solution)
- every portion of the mixture is like every other portion
- Apple juice, sea water
Heterogeneous mixture - Answer Composition is not uniform
- Composition varies from where you sample it
- Mixing
Extensive property - Answer Depends on the amount of matter
Cannot be used to help identify a substance because it changes
- Mass and volume
- Values of the same extensive property can be added together
Intensive property - Answer Does not depend on the amount of matter
Can be used to help identify a substance because it does not change with amount of matter
present
- Boiling point, density, freezing point, color
Physical PROPERTY - Answer Can be observed and measured without changing the identity
of a substance
- Color, melting point, boiling point
Answers 2025-2026 All Reviewed.
Chemistry - Answer Study of matter and the changes that matter undergoes
Matter - Answer Anything that has mass and occupies space
Steps of the Scientific method - Answer 1) Observation
2) Hypothesis
3) Experiment
4) Model (theory)
5) Further experiment or alter model
Quantitative properties - Answer Properties that can be measured (time, temperature, mass,
distance)
Lowest possible temperature on Kelvin scale - Answer 0
Exact number - Answer 1) Defined value
2) Determined by counting
Inexact number - Answer Measured by any method other than counting (length, mass,
volume, time, speed)
Significant figures in addition and subtraction rule - Answer The answer cannot have more
digits to the right of the DECIMAL POINT than any of the original numbers
Significant figures in multiplication and division rule - Answer The answer cannot have more
SIGNIFICANT FIGURES than the original number with the smallest NUMBER of significant figures
Subtance - Answer A form of matter that has definite composition and distinct properties
(Salt, iron, water, carbon dioxide)
, - Does not conform to the shape of its container
Liquid - Answer Particles are close together but are not held rigidly in position; they are free
to move around
- Conforms to the shape of the part of the container it fills
Gas - Answer Particles are separated by distances that are very large
- Assumes both shape and volume of the container
Mixture - Answer A physical combination of two or more substances
Homogeneous mixture - Answer Uniform throughout (aka solution)
- every portion of the mixture is like every other portion
- Apple juice, sea water
Heterogeneous mixture - Answer Composition is not uniform
- Composition varies from where you sample it
- Mixing
Extensive property - Answer Depends on the amount of matter
Cannot be used to help identify a substance because it changes
- Mass and volume
- Values of the same extensive property can be added together
Intensive property - Answer Does not depend on the amount of matter
Can be used to help identify a substance because it does not change with amount of matter
present
- Boiling point, density, freezing point, color
Physical PROPERTY - Answer Can be observed and measured without changing the identity
of a substance
- Color, melting point, boiling point
