Semester Exam

Front

What causes an object at rest to begin moving?

Back

Unbalanced forces act on the object.

Front

What indicates the formation of a new substance?

Back

Bubbles and fizzing occur.

Front

How many of the following substances are elements: NaOH, Cu, H2O, N2, H2?

Back

3 (Cu, N2, H2).

Front

What does the term 'Luster' refer to in properties of matter?

Back

The way a surface appears when it reflects light.

Front

When does a skateboarder have the most potential energy?

Back

At the top of the ramp.

Front

What is potential energy?

Back

The energy stored in an object due to its position.

Front

What is kinetic energy?

Back

The energy an object has due to its motion.

Front

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

Back

A physical change does not alter the substance's chemical composition, while a chemical change does.

Front

What is friction?

Back

A force that opposes the motion of an object.

Front

What is an element?

Back

A pure substance that cannot be broken down into simpler substances.