Ob8 SC1 Interactive Video

Identify the reactants in the following chemical equation:

CH₄(g) + 2O₂(g) → CO₂(g) + 2H₂O(g)

• CH₄

• O₂

• CO₂

• H₂O

Answer explanation

The CH₄ and the O₂ are reacting, therefore they are the reactants.

The CO₂(g) and the H₂O are being produced, therefore they are the products

Identify which of the following reactions is a synthesis reaction.

• H₂O(l) → H₂(g) + O₂(g)

• 3Ca(OH)₂ + 2FeCl₃ → 2Fe(OH)₃ + 3CaCl₂

• H₂​(g) + Cl₂​(g) → 2HCl (g)

• TiCl₄​(aq) + 2Mg (s) → Ti(s) + 2MgCl_2​(aq)

Answer explanation

Here the H₂​ is combining with the Cl₂​ to form HCl so HCl is being synthesized

Identify which of the following reactions is a decomposition reaction.

• H₂O(l) → H₂(g) + O₂(g)

• 3Ca(OH)₂ + 2FeCl₃ → 2Fe(OH)₃ + 3CaCl₂

• H₂​(g) + Cl₂​(g) → 2HCl (g)

• TiCl₄​(aq) + 2Mg (s) → Ti(s) + 2MgCl_2​(aq)

Answer explanation

The H₂O is being split (or decomposes) into H₂ and O₂

Identify which of the following reactions is a single displacement reaction.

• H₂O(l) → H₂(g) + O₂(g)

• 3Ca(OH)₂ + 2FeCl₃ → 2Fe(OH)₃ + 3CaCl₂

• H₂​(g) + Cl₂​(g) → 2HCl (g)

• TiCl₄​(aq) + 2Mg (s) → Ti(s) + 2MgCl_2​(aq)

Answer explanation

In this case the Cl is being displaced, or replaced by the Mg to bond with the Ti.

Identify which of the following reactions is a double displacement reaction.

• H₂O(l) → H₂(g) + O₂(g)

• 3Ca(OH)₂ + 2FeCl₃ → 2Fe(OH)₃ + 3CaCl₂

• H₂​(g) + Cl₂​(g) → 2HCl (g)

• TiCl₄​(aq) + 2Mg (s) → Ti(s) + 2MgCl_2​(aq)

Answer explanation

Here the Ca start off bonded to the OH and the Fe with the Cl, however they swap so that the Ca is bonged with the Cl and the Fe is now bonded with the OH

A (a)   reaction is where two compounds swap parts to form two new compounds.

A (a)   reaction is where one compound splits into simpler substances.

A (a)   reaction is where one element in a compound is replaced by another element.

A (a)   reaction is where two or more substances join to form a new substance.