CHEM: 1110 (Principles of Chemistry I) Exam 1 with Questions and Answers
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Module
Chem 1110
Institution
Chem 1110
CHEM: 1110 (Principles of Chemistry I) Exam 1 with Questions and Answers
What does each substance have, no matter how simple or complex? ANSWER Every substance has at least 1 differentiating characteristic that makes it unique
Good differentiating characteristics should have what two values? ...
CHEM: 1110 (Principles of Chemistry I) Exam 1 with Questions and Answers
What does each substance have, no matter how simple or complex? ANSWER Every substance has at least 1 differentiating characteristic that makes it unique
Good differentiating characteristics should have what two values? ANSWER 1. Intensive properties that do not depend on the amount of substance we have
2. Values that are unique for each substance
Intensive Property ANSWER A property that does not depend on the amount of substance we
have
Extensive Property ANSWER A property that depends on the amount of substance we have
What are examples of intensive properties? ANSWER 1. Boiling point
2. Density
3. Temperature
4. Hardness
5. Color
6. Conductivity
7. Melting point
What are examples of extensive properties? ANSWER 1. Mass
2. Volume
3. Length What are examples of good differentiating characteristics? ANSWER 1. Boiling point
2. Melting point
3. Color
4. Hardness
5. Conductivity
Why are temperature and pressure not good differentiating characteristics? ANSWER Although they are intensive properties, they are not good differentiating characteristics because they are properties of the entire system and not of its individual components
Phase Change ANSWER The transformation of a pure substance from one phase to another at constant pressure that occurs at a well-defined temperature
What are the phase changes? ANSWER Solid to Liquid- Melting
Liquid to Solid- Freezing
Liquid to Gas- Vaporization
Gas to Liquid- Condensation
Gas to Solid- Deposition
Solid to Gas- Sublimation
Phase Transition Graph ANSWER What occurs at a phase transition? ANSWER The energy added or removed induces a change
of state without altering the actual temperature of the system; the larger the change in density induced by the phase transition, the larger the energy transfer
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