Understanding Chemical Reactions and Equations

$$2H_2O \rightarrow 2H_2 + O_2$$

$$2Na + Cl_2 \rightarrow 2NaCl$$

$$AgNO_3 + NaCl \rightarrow AgCl + NaNO_3$$

$$C_2H_6 + O_2 \rightarrow CO_2 + H_2O$$

There are 4 hydrogen atoms

There are 4 sulfur atoms

There are 4 oxygen atoms

There are 4 molecules

Two or more substances combine to form one product

One chemical breaks down into two or more simpler substances

Two compounds exchange ions

A substance reacts with oxygen to produce energy

1

2

3

4

$$2KClO_3 \rightarrow 2KCl + 3O_2$$

$$Zn + 2HCl \rightarrow ZnCl_2 + H_2$$

$$C_6H_{12}O_6 + 6O_2 \rightarrow 6CO_2 + 6H_2O$$

$$NaOH + HCl \rightarrow NaCl + H_2O$$

$$2K + 2H_2O \rightarrow 2KOH + H_2$$

$$CH_4 + 2O_2 \rightarrow CO_2 + 2H_2O$$

$$2AgNO_3 + Na_2SO_4 \rightarrow Ag_2SO_4 + 2NaNO_3$$

$$2HgO \rightarrow 2Hg + O_2$$

Coefficient shows the number of atoms, subscript shows the number of molecules

Coefficient shows the number of molecules, subscript shows the number of atoms in a molecule

Both show the number of atoms

Both show the number of molecules

$$2H_2 + O_2 \rightarrow 2H_2O$$

$$AgNO_3 + NaCl \rightarrow AgCl + NaNO_3$$

$$2KClO_3 \rightarrow 2KCl + 3O_2$$

$$Zn + 2HCl \rightarrow ZnCl_2 + H_2$$

Synthesis

Decomposition

Combustion

Single Replacement

$$H_2 + O_2 \rightarrow H_2O$$

$$2H_2 + O_2 \rightarrow 2H_2O$$

$$H_2 + 2O_2 \rightarrow 2H_2O$$

$$2H_2 + 2O_2 \rightarrow 2H_2O$$