chem 120 exam 1 study guide questions
with verified answers
Scientific Method - Correct answer An approach to acquiring knowledge based upon observation of
phenomena
The development of a testable hypothesis and additional experiments that test the validity of hypothesis
Hypothesis - Correct answer A tentative and testable explanation of an observation or series of
observations
Scientific Law - Correct answer Concise and generally applicable statement of a fundamental scientific
principle
Law of Definite Proportions - Correct answer Principle that compounds always contain the same
proportion of their component elements
Law of Constant Composition - Correct answer Principle that all samples of a particular compound have
the same elemental composition no matter their source
Law of Multiple Proportions - Correct answer Principle that an element may combine in different ratios
with another element forming different compounds
Structural Formula - Correct answer a representation of a molecule that uses short lines between the
symbols of elements to show chemical bonds between atoms
Intensive Properties - Correct answer Independent of the amount of substance present (color, odor,
malleability, density, etc.)
Extensive Properties - Correct answer Dependent upon amount of substance (mass, length, volume)
Physical Properties - Correct answer Properties that can be measured or observed without changing the
substance (melting point, temperature, density)
, Chemical Properties - Correct answer Property that describes how a substance will react; the substance
will change into a new substance from this property (oxidation, flammability)
solid - Correct answer Has definite shape and definite volume
liquid - Correct answer Has indefinite shape and definite volume
gas - Correct answer Has indefinite shape and indefinite volume
Sublimation - Correct answer solid to gas
Deposition - Correct answer gas to solid
Melting - Correct answer solid to liquid
Freezing - Correct answer liquid to solid
Condensation - Correct answer Gas to liquid
Vaporization - Correct answer Liquid to gas
Pure substances - Correct answer Same physical and chemical properties throughout.
Cannot be separated into simpler substances by physical processes.
Mixtures - Correct answer Composed of two or more pure substances.
Can be separated by physical processes.
Homogeneous - Correct answer Constituents are distributed uniformly throughout the sample.
with verified answers
Scientific Method - Correct answer An approach to acquiring knowledge based upon observation of
phenomena
The development of a testable hypothesis and additional experiments that test the validity of hypothesis
Hypothesis - Correct answer A tentative and testable explanation of an observation or series of
observations
Scientific Law - Correct answer Concise and generally applicable statement of a fundamental scientific
principle
Law of Definite Proportions - Correct answer Principle that compounds always contain the same
proportion of their component elements
Law of Constant Composition - Correct answer Principle that all samples of a particular compound have
the same elemental composition no matter their source
Law of Multiple Proportions - Correct answer Principle that an element may combine in different ratios
with another element forming different compounds
Structural Formula - Correct answer a representation of a molecule that uses short lines between the
symbols of elements to show chemical bonds between atoms
Intensive Properties - Correct answer Independent of the amount of substance present (color, odor,
malleability, density, etc.)
Extensive Properties - Correct answer Dependent upon amount of substance (mass, length, volume)
Physical Properties - Correct answer Properties that can be measured or observed without changing the
substance (melting point, temperature, density)
, Chemical Properties - Correct answer Property that describes how a substance will react; the substance
will change into a new substance from this property (oxidation, flammability)
solid - Correct answer Has definite shape and definite volume
liquid - Correct answer Has indefinite shape and definite volume
gas - Correct answer Has indefinite shape and indefinite volume
Sublimation - Correct answer solid to gas
Deposition - Correct answer gas to solid
Melting - Correct answer solid to liquid
Freezing - Correct answer liquid to solid
Condensation - Correct answer Gas to liquid
Vaporization - Correct answer Liquid to gas
Pure substances - Correct answer Same physical and chemical properties throughout.
Cannot be separated into simpler substances by physical processes.
Mixtures - Correct answer Composed of two or more pure substances.
Can be separated by physical processes.
Homogeneous - Correct answer Constituents are distributed uniformly throughout the sample.
