Scaffolded (Unpacked) Essential questions: with an indicator. 8 Chapter 11 Section 3: Acidic and Basic demonstration of a color change ideas Solutions p. 322-329. using universal pH indicator. 1. How can you determine Compare and contrast the properties and Students change the concentrations whether a substance is an acid or uses of acids and bases. of an acid and a base and use Materials that result base using an indicator? Recommended activities: universal indicator to test the pH of from a chemical 2. Describe the difference (For labs and investigations, allow students Use the pH scale to compare the strengths the resulting solutions. Students see change have between an acid and a base in to identify independent and dependent of a variety of acids and bases. an animation showing that water physical and relationship to its pH. molecules interact and separate into variables and controls, what tools are chemical properties Design an experiment to determine what the H3O+ ion and the OH− ion. that are different needed to do the gathering, how happens when an acid is mixed with a Students see that the pH of a from the original measurements will be recorded, provide base. solution is related to the interacting evidence to support explanations or solutions concentration of these ions in water. substances. and how many data are needed to support a Construct a word equation for a This lesson plan is available at claim.) neutralization reaction. Labs: Science Activity a Day investigation: Acids and bases p.16 Directions for a lab investigation into the properties of acids and bases using cabbage juice indicator is available at In this activity, students will use their knowledge of color changes with red cabbage indicator to neutralize an acidic solution with a base and then neutralize a basic solution with an acid. Find directions for this lab at A hands-on activity that relates acid-base chemistry to engineering is described at A one-page summary defining acids and bases is available at A more complete explanation of the properties and reactions of acids and bases
Scaffolded (Unpacked) ideas Materials that result from a chemical change have physical and chemical properties that are different from the original interacting substances. Essential questions: 1. How can you determine whether a substance is an acid or base using an indicator? 2. Describe the difference between an acid and a base in relationship to its pH. with an indicator. Compare and contrast the properties and uses of acids and bases. Use the pH scale to compare the strengths of a variety of acids and bases. Design an experiment to determine what happens when an acid is mixed with a base. Construct a word equation for a neutralization reaction. 8 Chapter 11 Section 3: Acidic and Basic Solutions p. 322-329. Recommended activities: (For labs and investigations, allow students to identify independent and dependent variables and controls, what tools are needed to do the gathering, how measurements will be recorded, provide evidence to support explanations or solutions and how many data are needed to support a claim.) Labs: Science Activity a Day investigation: Acids and bases p.16 Directions for a lab investigation into the properties of acids and bases using cabbage juice indicator is available at In this activity, students will use their knowledge of color changes with red cabbage indicator to neutralize an acidic solution with a base and then neutralize a basic solution with an acid. Find directions for this lab at A hands-on activity that relates acid-base chemistry to engineering is described at A one-page summary defining acids and bases is available at A more complete explanation of the properties and reactions of acids and bases demonstration of a color change using universal pH indicator. Students change the concentrations of an acid and a base and use universal indicator to test the pH of the resulting solutions. Students see an animation showing that water molecules interact and separate into the H3O+ ion and the OH− ion. Students see that the pH of a solution is related to the concentration of these ions in water. This lesson plan is available at
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