CK-12 Physical Science Concepts - For Middle School

http://www.ck12.org Chapter 3. Chemical Interactions

MEDIA

Click image to the left for use the URL below.

URL: http://www.ck12.org/flx/render/embeddedobject/82367

Review

1. What is a chemical equation? Identify the parts of a chemical equation.


2. Write a chemical equation for the chemical reaction in which calcium carbonate (CaCO 3 ) produces calcium
   oxide (CaO) and carbon dioxide (CO 2 ).


3. Describe in words the chemical reaction represented by the following chemical equation: 2NO 2 →2O 2 + N 2


4. When is a chemical equation balanced?