Chapter 5.1

When a solid forms as two solutions are mixed together, what is the solid called?

This is called a precipitate.

Classify the following as an endothermic or exothermic reaction: The temperature of two sepature solution is found to 20 degrees Celsius. When the solutions are mixed, a precipitate forms and the temperature changes to 18 degrees Celsius. Explain your reason.

A endothermic reaction because an endothermic reaction absorbs energy in the form of heat, so the temperature decreases.

Exothermic reaction

A reaction that releases energy in the form heat.

Endothermic reaction

A reaction that that absorbs energy in the form heat.

Precipitate

A solid that forms from a solution during a chemical reaction.

What happens to the chemical bonds in a substance during a chemical reaction?

In a chemical reaction, chemical bonds change some of their properties and determine weather or not the reaction will occur under a specific set of circumstances.

What two kinds of energy changes can take place during a chemical reaction?

Endothermic when it absorbs energy in the form of heat and exothermic when it releases energy in the form heat.

What are some examples for evidence of a chemical reaction?

Some examples for evidence of a chemical reaction are color change, precipitation, gas production, changes in temperature, and changes in properties.