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Why Do We Put Salt on Our Sidewalks?

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Channel: SciShow Kids
Categories: Chemistry   |   Environmental   |   Science  
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Description

It's snowing and Mister Brown needs to go put some salt on the Fort's front steps. But Squeaks wants to know, why do we put salt on icy sidewalks?

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SOURCES:

Second Grade Next Generation Science Standards

Disciplinary Core Ideas:

PS1.A: Structure and Properties of Matter - Different kinds of matter exist and many of them can be either solid or liquid, depending on temperature. Matter can be described and classified by its observable properties. (2-PS1-1).

PS1.B: Chemical Reactions - Heating or cooling a substance may cause changes that can be observed. Sometimes these changes are reversible, and sometimes they are not (2-PS1-4).

Performance Expectations:

2-PS1-1. Plan and conduct an investigation to describe and classify different kinds of materials by their observable properties.

2-PS1-4. Construct an argument with evidence that some changes caused by heating or cooling can be reversed and some cannot.


Sources:
https://www.sciencelearn.org.nz/resources/608-melting-and-freezing
https://www.animations.physics.unsw.edu.au/jw/freezing-point-depression-boiling-point-elevation.htm
https://www.scientificamerican.com/article/why-do-we-put-salt-on-icy/
https://oceanservice.noaa.gov/facts/oceanfreeze.html
https://www.canr.msu.edu/news/salt_runoff_can_impair_lakes
https://www.thechaosandtheclutter.com/archives/melting-ice-experiment

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