Chemistry Instructional Guide

Compounds and Mixtures

Chemistry

Quarter 2

HMHUnit 3

END OF THE UNIT COMPETENCY WITH LANGUAGE SUPPORTS

Standard 2.1 What does it look like to demonstrate profciency on this standard? Organizing Data Students organize data that represents: ● Models properties of various compounds. Models may include: ○ Chemical formulas ○ Pictorial models Identifying Relationships Students analyze the data and identify and describe relationships in the datasets, including: ● Identifying patterns similarities and differences within the electrons, nuclei, and ions of models and elemental composition Interpreting Data Students use the analyzed data to support the claim that: ● Ionic, covalent, and metallic compounds differ the strength and types of attractions between charged particles (such as between ions or electrons and nuclei in atoms) Students include a statement regarding how variation or uncertainty in the data may affect the interpretation of the data, including: ● Limitations of the model of ionic, covalent, and metallic bonding in that compounds may be not clearly ionic or covalent, but more ionic-like or covalent-like. Standard 2.2 What does it look like to demonstrate profciency on this standard? Identifying the phenomenon under investigation Students describe the phenomenon under investigation, which includes the following idea: ● The relationship between the measurable properties (e.g., melting point, boiling point, vapor pressure, surface tension) of a substance and the strength of the electrical forces between the particles of the substance. Identifying the evidence to answer this question Students develop an investigation plan and describe the data that will be collected and the evidence to be derived from the data that would allow inferences to be made about the strength of electrical forces between particles, including: ● bulk properties of a substance (e.g., melting point and boiling point, volatility, surface tension) Students describe why the data about bulk properties would provide information about strength of the electrical forces between the particles of the chosen substances, including the following descriptions: ● The spacing of the particles of the chosen substances can change as a result of the experimental procedure even if the identity of the particles does not change (e.g., when water is boiled the molecules are still present but further apart). ● Thermal (kinetic) energy has an effect on the ability of the electrical attraction between particles to keep the particles close together. Thus, as more energy is added to the system, the forces of attraction between the particles can no longer keep the particles close together.