8th Grade Science Guide

8.1: Chemistry 3 Dimensions & Progressions

Unit 2

STANDARD ●​ 8.1.3 Plan and conduct an investigation and then analyze and interpret the data to identify patterns in changes in a substance’s properties to determine whether a chemical reaction has occurred. Examples could include changes in properties such as color, density, flammability, odor, solubility, or state. (MS-PS1-2) ●​ 8.1.6 Develop a model to describe how the total number of atoms does not change in a chemical reaction, indicating that matter is conserved. Emphasize demonstrations of an understanding of the law of conservation of matter. (MS-PS1-5)

CONCEPTS

SKILLS

●​ Changes in a substance’s properties ●​ Chemical reaction ●​ Conservation of mass

●​ Plan and conduct ●​ Investigate ●​ Analyze ●​ Interpret data ●​ Develop a model

LEARNING PROGRESSIONS

●​ Substances react chemically in specific ways. ●​ In a chemical reaction, atoms that make up a substance are regrouped into different modules ●​ These new substances have different properties from the original substance ●​ Some chemical reactions release energy, others store energy ●​ There are specific ways to see chemical reactions, which include color change, flammability, odor, solubility, gas released, etc. ●​ When a chemical reaction occurs, matter is neither created or destroyed, but stays the same ●​ This principle is called the Law Conservation of Matter.

VOCABULARY

●​ Reactant ●​ Product ●​ Chemical reaction

●​ Dissolve ●​ React ●​ inference

●​ Chemical bond ●​ Particle ●​ Solution

POSSIBLE PHENOMENA ●​ When vinegar is put on the hard water crust on sink or shower faucets, the white crusties begin to bubble. ●​ There is a temperature change when vinegar and baking soda are combined. ●​ A shovel left outside for a while rusts. ●​ The ice patch on your sidewalk turns into water during the day but back to ice at night.

END OF UNIT COMPETENCY WITH LANGUAGE SUPPORTS