Question

these are the elements or compounds that enter into a chemical reaction.
these are the substance(s) formed in a chemical reaction.
these are the reactants in the chemical equation c₆h₁₂o₆ + 6o₂ → 6co₂ + 6h₂o
these are the reactants in the chemical equation 6co₂ + 6h₂o → c₆h₁₂o₆ + 6o₂
these are the reactants in the chemical equation 2h₂ + o₂ → 2h₂o
these are the reactants in the chemical equation 2h₂o → 2h₂ + o₂
reactants 2 h₂ + o₂ 2 h₂o 6 co₂ + 6 h₂o c₆h₁₂o₆ + 6 o₂ products

Explanation:

In a chemical reaction, reactants are the starting - substances and products are the ending - substances. For the equation $C_6H_{12}O_6 + 6O_2
ightarrow6CO_2 + 6H_2O$, $C_6H_{12}O_6$ and $6O_2$ are reactants. For $6CO_2 + 6H_2O
ightarrow C_6H_{12}O_6 + 6O_2$, $6CO_2$ and $6H_2O$ are reactants. For $2H_2+O_2
ightarrow2H_2O$, $2H_2$ and $O_2$ are reactants. For $2H_2O
ightarrow2H_2 + O_2$, $2H_2O$ is the reactant.

Answer:

1. Reactants: Elements or compounds entering a reaction
2. Products: Substances formed in a reaction
3. Reactants: $C_6H_{12}O_6 + 6O_2$
4. Reactants: $6CO_2 + 6H_2O$
5. Reactants: $2H_2 + O_2$
6. Reactants: $2H_2O$