Reporting Category: Properties of Matter and Thermochemistry Standard: 1.1 - Identify and explain physical properties (e.g., density, melting point, boiling point, conductivity, malleability) and chemical properties (e.g., the ability to form new substances). Distinguish between chemical and physical changes.
Several properties for zinc (Zn) are listed below:
brittle at room temperature, but malleable between 100°C and 150°C
bluish-white in color
burns in air at high temperatures, giving off zinc oxide (ZnO) gas
conducts heat and electricity
sinks in water
reacts with acids and bases
exposed surfaces tarnish in moist air
Identify two physical properties of zinc from the list. Explain why the properties you identified are physical properties and not chemical properties.
Identify two chemical properties of zinc from the list. Explain why the properties you identified are chemical properties and not physical properties.
Scoring Guide and Sample Student Work Select a score point in the table below to view the sample student response.
The response demonstrates a thorough understanding of physical and chemical properties. The response correctly identifies two physical properties and two chemical properties from the list provided and explains why each property is a physical or chemical property.