Chemistry of Materials

A student pours two different solutions into a glass beaker. Which of the following would indicate that a chemical reaction took place between two solutions?

• A change in color of a solution

• The formation of a precipitate

• A change in temperature

• All of the above

Tags

NGSS.MS-PS1-2

While working on an activity to investigate chemical reactions, a student mixes two clear liquids in a beaker. When the two liquids mix, the result is a clear liquid and an orange solid precipitate. Which best describes the reactants that the student worked with?

• The initial two clear liquids

• The resulting clear liquid and the beaker

• The orange solid precipitate

• All of the above

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

A student was given a sample of one of the plastics to identify. She discovered that it was flexible, would float on water, and was resistant to breaking at low temperatures. What was the name of her plastic?

• Polystyrene

• Polyurethane

• Polyamide

• Low Density Polyethylene

Which plastic would not make a good container for food in a freezer?

• Polystyrene

• Polyurethane

• Polyamide

• Low Density Polyethylene

Tags

NGSS.MS-PS1-2

A ​ (a)   is a material made from atoms of two or more combined elements.

• compound

• element

• chemical

• mixture

Tags

NGSS.MS-PS1-1

Which material is made by joining many smaller units together?

• composite

• metal

• polymer

• ceramic

Match the following

• pure substance that can't be broken down

• compound

• varies throughout

• homogeneous

• same throughout

• element

• 2 or more elements

• heterogeneous

Composite

• tiny, crystalline grains visible when looking at a fresh metal sample through a microscope

• formed by combining two or more materials to make a new material with a different set of properties

• objects made from clay or other combinations of minerals baked at high temperature

• the property that describes how much air or water a material will absorb.

Match the following properties with their classification as either an intensive or extensive property.

• Appearance of an object

• Silver

• Color of an object

• Metallic

• Temperature at which an object changes from solid to liquid

• Melting point

• Amount of matter in an object

• Mass

a resistance to being scratched or dented.

• Luster

• Flammability

• conductivity

• hardness