Study Notes on Scientific Method and Environmental Chemistry

The Scientific Method The process involves making observations, developing questions, formulating hypotheses, making predictions, conducting experiments, and analyzing data. General theories must align with existing data and theories. Hypotheses are explanations for phenomena, while predictions specify expected outcomes based on those hypotheses. The experimental variables include manipulated (independent), response (dependent), and controlled variables to isolate the effects of the manipulated variable. # Chemistry and the Environment The unit covers the analysis of acids and bases, organic compounds, and assesses the risks and benefits of chemical processes in environmental contexts. Labs aim to foster collaboration, stewardship, and interest in science. Skills include nomenclature, chemical reactions, and balancing equations.

Atomic Structure Protons define the atomic number, neutrons add to mass number, and electrons balance charge. The periodic table is organized into metals and non-metals. Metals form cations, whereas non-metals predominantly form anions or covalent bonds.

Chemical Naming Different compounds include ionic, molecular, acids, and bases. Ionic compounds have specific naming rules based on cation and anion combinations. Acids follow IUPAC or classical naming conventions based on their anions. Functional groups in organic compounds determine classification and naming in chemistry.

Acids and Bases Acids donate protons and increase hydronium ion concentration; bases accept protons and produce hydroxide ions. Acid-base reactions produce conjugate acids and bases upon donating and accepting protons. The pH scale indicates solution acidity, with below 7 being acidic, above 7 being basic, and 7 being neutral. Strong acids and bases ionize completely, while weak acids/bases do so partially, affecting their reactivity and equilibrium in a solution. # Titration A titration is utilized to find concentrations, applying the formula CaVa = CbVb. Experimental design involves addition of a titrant to an analyte until the endpoint is reached, typically signified by a color change. Precise measurements and proper technique are essential for accuracy and reproducibility. The calculations are based on stoichiometry and molarity formulas, with knowledge of significant figures being necessary for reporting results accurately. # Environmental Chemistry Focus on understanding emissions, pollutants, and their impacts on ecosystems. Topics include acid deposition, organic pollutants, climate change, and water quality. The effects of fertilizers, pesticides, and industrial byproducts on environmental health are examined, emphasizing the need for sustainable practices and regulations to reduce hazards.