A lab group reacts sodium oxide (Na₂O) with hydrochloric acid (HCl) to produce sodium chloride (NaCl) and water (H₂O). When writing their lab report, they came up with the following equation to represent the reaction:

Na₂O + HCl -> NaCl + H₂O

Does this equation satisfy the Law of Conservation of Matter? Why or why not?

Zn(s) + 2HCl(aq) --> ZnCl₂(aq) + H₂(g)

This is a __________ reaction and the product(s) is/are

Balance the equation:   ______ Fe +   _____ O₂ --> ______Fe₂O₃

Match the example to type of reaction

Examine the following reaction, then identify the reactants and products:

C₃H₈(g)+5O₂(g)→3CO₂(g)+4H₂O(g)

Magnesium is a highly flammable element which is easily combustible in the presence of oxygen:

2Mg + O₂ → ?? + heat

What is the unknown product?

An antacid tablet was dropped in to plastic bag containing 10 ml at 22C distilled water. The bag was immediately zipped closed and the chemical reaction proceeded until completion. Cite evidence to confirm that this was a chemical reaction.

A student was adamant that a bag containing distilled water, and an antacid tablet lost mass. She argued that a solid had changed to a gas, thus a loss in mass. How would you respond to this student?

Sort according to balanced and unbalanced.