HS-PS1-5
The standard
Apply scientific principles and evidence to provide an explanation about the effects of changing the temperature or concentration of the reacting particles on the rate at which a reaction occurs.
Next Generation Science Standards
What this standard means
Students need to explain why reactions speed up or slow down when temperature or concentration changes. They should connect faster rates to more frequent collisions, higher energy collisions, or both. They should use simple data, such as time, bubbles, color change, or temperature trials, to support their claim.
Mastery looks like a clear claim with evidence from a two-reactant reaction and reasoning based on particle collisions. Students often say “heat makes it faster” without explaining energy. They also mix up concentration with amount, or describe what happened without linking it to collision frequency.
Ways to teach it
- Run an antacid tablet lab using cold, room temperature, and warm water, then time how long each tablet takes to react.
- Prompt students to explain why a glow stick shines brighter in warm water than cold water using collision energy and reaction rate.
- Give a three-row data table of concentration and reaction time, and ask students to identify the fastest reaction and explain why.
- Connect to food spoilage by asking why milk lasts longer in the refrigerator than on the counter.
Plan a lesson for HS-PS1-5
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Related standards
- HS-PS1-2
Construct and revise an explanation for the outcome of a simple chemical reaction based on the outermost electron states of atoms, trends in the periodic table,...
- MS-PS1-4
Develop a model that predicts and describes changes in particle motion, temperature, and state of a pure substance when thermal energy is added or removed.
- MS-PS1-2
Analyze and interpret data on the properties of substances before and after the substances interact to determine if a chemical reaction has occurred.
- MS-PS3-4
Plan an investigation to determine the relationships among the energy transferred, the type of matter, the mass, and the change in the average kinetic energy of...