Conservation of Mass and Chemical Equations

The video tutorial explains the conservation of mass in chemical reactions, emphasizing that no atoms are created or destroyed. It illustrates this principle with examples, calculating the mass of reactants and products. The tutorial also covers features of chemical equations, including balancing and state symbols, and applies these concepts to specific reactions involving magnesium, calcium carbonate, and sodium sulfate.

What principle states that atoms are neither created nor destroyed in a chemical reaction?

• Avogadro's Law

• Law of Definite Proportions

• Conservation of Mass

• Periodic Law

In the reaction of magnesium with oxygen, what is the mass of oxygen used if 48 grams of magnesium produces 80 grams of magnesium oxide?

• 32 grams

• 48 grams

• 80 grams

• 16 grams

How much carbon dioxide is produced when 100 grams of calcium carbonate decomposes to form 56 grams of calcium oxide?

• 44 grams

• 56 grams

• 100 grams

• 32 grams

What must be true for a chemical equation to reflect the conservation of mass?

• It must be balanced.

• It must include state symbols.

• It must have more reactants than products.

• It must have more products than reactants.

What does the state symbol 'aq' indicate in a chemical equation?

• The substance is a gas.

• The substance is in aqueous solution.

• The substance is a solid.

• The substance is a liquid.

In the reaction of sodium thiosulfate with hydrochloric acid, which of the following is NOT a product?

• Solid sulfur

• Hydrogen gas

• Sulfur dioxide

• Sodium chloride

Which state symbol is used to indicate a substance is a liquid in a chemical equation?

• (g)

• (l)

• (aq)

• (s)