Grades 3–5 · 8 connected explanations
Structures & Materials
Compare changes of state, separation and chemical change. Then connect material behavior with stronger structures and different kinds of pictures.
Materials & Matter
How can water change between ice and liquid?
Water can change state while remaining the same substance.
Materials & Matter
Why can salt remain after saltwater evaporates?
Evaporation can separate water from a dissolved material that remains behind.
Materials & Matter
How does rust change an iron sample?
Rust introduces a change in which new substances form.
Materials & Matter
Why does firing turn a clay pot into a different material?
Firing clay changes a material in ways that simple drying does not.
Materials & Matter
How does cardboard's wavy core help support it?
The arrangement of layers helps cardboard resist bending.
Materials & Matter
Why can a cornstarch suspension resist a quick change in motion?
A suspension shows why the response of a material can depend on how it is disturbed.
Arts & Music
How can lines make a flat drawing look deep?
Geometric arrangements of lines can make a flat picture suggest depth.
Arts & Music
Why does watercolor spread differently on wet paper?
The water already in paper changes how a painted mark spreads.