Unit 3 Review - Chemical Processes

Front

How many elements are in the chemical formula C6H12O6?

Back

3 elements: Carbon (C), Hydrogen (H), and Oxygen (O).

Front

What do the letters and numbers in the chemical formula H2O2 represent?

Back

2 Hydrogen atoms and 2 Oxygen atoms.

Front

What can be determined without changing a substance into a new substance?

Back

Physical properties.

Front

What is the best evidence that a chemical change has taken place?

Back

The apple has turned brown.

Front

What occurs when the atoms of a substance are rearranged to create a new substance?

Back

A chemical reaction.

Front

Define a chemical property.

Back

A characteristic of a substance that can only be observed during a chemical reaction.

Front

Define a physical property.

Back

A characteristic of a substance that can be observed without changing its chemical composition.

Front

What is a chemical reaction?

Back

A process that involves the rearrangement of the molecular or ionic structure of a substance.

Front

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

Back

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

Front

What is an example of a physical change?

Back

Melting ice.