Nothing but the Truth About Nonmetals

Name ______

“What’s The Truth About Chemical Formulas and Equations? PART I Directions: The statements about compounds and equations below are all false. Change each statement to make it true by writing the correct word ABOVE the italicized word or phrase.

1). A chemical equation is a combination of chemical symbols and numbers to represent a substance.

2). A coefficient is a number written below and to the right of a chemical symbol in a formula.

3). If there is no subscript beside a symbol, only two atoms of that element are present.

4). A chemical formula uses chemical symbols and formulas as a shortcut to describe a chemical reaction.

5). The starting materials in a chemical reaction are the products.

6). The substances formed from a reaction are the subscripts.

7). A minus sign separates the formulas of two or more reactants or products from one another.

8). The arrow, also called the stop sign, separates the formulas of the reactants from the formulas of the products.

9). An equation that has the wrong chemical symbol or formula will describe the reaction correctly..

10). Atoms are always lost or gained in a chemical reaction; they are just rearranged..

11). In a chemical reaction, only half of the atoms in the reactants becomes part of the products.

12). The law of conservation of mass is also known as the law of conservation of energy.

13). The law of conservation of mass states that mass is created and destroyed in ordinary physical and chemical changes.

14). This law means that a chemical equation must show the same numbers, but not the same kinds, of atoms on both sides of the arrows.

PART II 15). Write the chemical equation that forms carbon dioxide (look on page 394). Label the reactants, plus sign, chemical symbol, formulas, yield sign, and product.