HS-PS1-3
The standard
Plan and conduct an investigation to gather evidence to compare the structure of substances at the bulk scale to infer the strength of electrical forces between particles.
Next Generation Science Standards
What this standard means
Students need to plan and run a fair test that measures observable properties of substances, then use those results to make claims about particle-level attractions. They are not just memorizing boiling points or force names. They need to connect evidence like melting point, evaporation rate, surface tension, or conductivity to how strongly particles attract each other.
Mastery looks like a clear procedure, controlled variables, useful data, and a claim backed by evidence. Students often get stuck treating bulk properties as random facts. They may also overfocus on naming force types instead of explaining that stronger attractions usually need more energy to separate particles.
Ways to teach it
- Run a surface tension lab using water, rubbing alcohol, and salt water, counting drops that fit on a penny before spilling.
- Ask students to write: Which substance has stronger particle attractions, and what evidence from our data supports that claim?
- Give students three data cards with boiling point, evaporation rate, and conductivity, then ask them to rank attraction strength with one reason.
- Connect to cooking by comparing why salt melts at very high temperatures while butter and sugar change much sooner.
Plan a lesson for HS-PS1-3
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Related standards
- 2-PS1-1
Plan and conduct an investigation to describe and classify different kinds of materials by their observable properties.
- 3-PS2-1
Plan and conduct an investigation to provide evidence of the effects of balanced and unbalanced forces on the motion of an object.
- MS-PS2-2
Plan an investigation to provide evidence that the change in an object's motion depends on the sum of the forces on the object and the mass of the object.
- MS-PS2-5
Conduct an investigation and evaluate the experimental design to provide evidence that fields exist between objects exerting forces on each other even though th...