In the video shown in the lesson sodium (Na) combined with ______ (H2O) to (70) form ______hydroxide (NaOH) and hydrogen gas (H2).

In the video shown in the lesson, sodium (Na) combined with water (H2O) to form sodium hydroxide (NaOH) and hydrogen gas (H2).

In the video, sodium (Na) combined with water (H2O) to form sodium hydroxide (NaOH) and hydrogen gas (H2).

To determine what substance combined with sodium (Na) to form sodium hydroxide (NaOH) and hydrogen gas (H2), we need to review the chemical equation given in the question.

The chemical equation provided in the question is:

Sodium (Na) + ______ (H2O) → Sodium Hydroxide (NaOH) + Hydrogen Gas (H2)

In this equation, we can see that sodium (Na) reacted with some other substance to form sodium hydroxide (NaOH) and hydrogen gas (H2).

The blank space represents the other substance involved in the reaction. To determine what that substance is, we need to understand the reactions involving sodium (Na) and water (H2O).

When sodium reacts with water, a single displacement reaction occurs. The sodium (Na) displaces the hydrogen (H) in water to form sodium hydroxide (NaOH) and hydrogen gas (H2).

Therefore, the correct answer to fill in the blank is water (H2O). Sodium combined with water (H2O) to form sodium hydroxide (NaOH) and hydrogen gas (H2).