CHEM 1F92 Chapter Notes - Chapter 1: Significant Figures, Decimal Mark, Trail Mix

39 views2 pages

Document Summary

Qualitative: consisting of general observations about the system. Quantitative: comprising numbers obtained by various measurements of the system. Hypothesis: a tentative explanation for a set of observations. Law: is a concise verbal or mathematical statement of a relationship between phenomena that is always the same under the same conditions. Theory: a unifying principle that explains a body of facts and/or those laws that are based on them. Substance: form of matter that has a de nite composition and distinct properties, ex. table sugar, gold. Mixture: combo of 2 or more substances in which the substances retain their distinct identities, ex. air, soft drinks. Homogeneous mixture: the composition of the mixture is the same throughout, ex. sugar water. Heterogeneous mixture: composition is not uniform ex. Element: substance that cannot be separated into simpler substances by chemical means. Compound: substances composed of atoms in 2 or more elements chemically united in xed proportions.