Experiment #1: Chemical Reactions

A __________________ takes place when one or more new substances are produced. The properties and composition of the products are different from those of the starting materials

chemical reaction

_________ are broken and _________ are formed during a chemical reaction

old bonds

new bonds

A chemical reaction is usually accompanied by _______________ like evolution of gas, precipitation, absorption or evolution of thermal energy, light, and/or other energy forms, and/or color changes

observable changes

Chemical reactions can be represented by _______________ which use symbols or formulae to represent reactants and products that are separated by a reaction arrow.

chemical equations

A __________________ can also be used to reveal the four patterns of chemical reactivity

chemical equation

What are the 4 classes of chemical reactions?

1. -

2. -

3. -

4. -

Combination
Decomposition
Single replacement
Double displacement

In a ________________, two or more reactants form one product

combination reaction

In a ________________ is where a compound breaks into two or more substances

decomposition

A _________________________ occurs when an element and a compound react to form another element or compound; the element itself becomes part of a compound and one of the elements that was in a compound comes out to be by itself

single-replacement reaction

In _______________________, atoms in two compounds switch places to form new products and one of these products is usually a precipitate

double-displacement reactions

Chemical reactions are also governed by ________

laws

What are the 2 laws?

1. -

2. -

Law of Conservation of Mass

Law of Definite Proportions

The ____________________ states that the mass is neither created nor destroyed in a chemical reaction

Law of Conservation of Mass

The _________________ states the different samples of the same compound always contain its constituent elements in the same proportion by mass

Law of Definite Proportions