December 8th Semester Exam Review 7th Period

Front

What season occurs when the area you live in tilts away from the sun?

Back

Winter

Front

What type of change occurs when water boils and changes from a liquid to a gas?

Back

Physical change

Front

What are the characteristics of metals?

Back

Typically solid and lustrous, possess high density, efficient conductors of thermal and electrical energy, can be shaped into sheets and wires.

Front

TRUE OR FALSE: Every compound is a molecule but not every molecule is a compound.

Back

TRUE

Front

How many distinct elements are in the chemical formula Al2Si3O5Fe2?

Back

4

Front

What is the definition of a physical change?

Back

A change that affects one or more physical properties of a substance without altering its chemical composition.

Front

What is the definition of a chemical change?

Back

A change that results in the formation of new chemical substances.

Front

What are nonmetals?

Back

Elements that are typically poor conductors of heat and electricity, and can be gases or brittle solids at room temperature.

Front

What are semimetals?

Back

Elements that have properties of both metals and nonmetals, often used in semiconductors.

Front

What is the difference between an element and a compound?

Back

An element is a pure substance made of only one type of atom, while a compound is made of two or more different types of atoms chemically bonded together.