24-25 Semester Exam Review - Units 1-4

Front

What is a chemical change?

Back

A chemical change is a process where a new substance is formed, and the original substance cannot be easily reversed.

Front

What is a physical change?

Back

A physical change is a process where the substance remains the same, and it can often be reversed.

Front

What is the difference between a chemical change and a physical change?

Back

In a chemical change, a new substance is formed, while in a physical change, the substance stays the same.

Front

What does a graph showing constant speed look like?

Back

A graph showing constant speed is a straight line with a positive slope.

Front

What does it mean when a bus is returning to its original position?

Back

It means the bus is moving backward towards where it started.

Front

What action increases the rate of dissolution of a solid in a liquid?

Back

Stirring the solution increases the rate of dissolution.

Front

What is a compound?

Back

A compound is a substance formed when two or more elements are chemically bonded together.

Front

Give an example of a compound.

Back

NaCl (sodium chloride) is an example of a compound.

Front

What is the role of temperature in the dissolution of solids?

Back

Increasing the temperature generally increases the rate of dissolution of solids in liquids.

Front

What happens to the state of matter during a physical change?

Back

The state of matter can change (e.g., solid to liquid) but the substance remains the same.