Chemistry Unit 7 (Rxns&Stoich)

Chemical Equations

100

An abbreviation indicating that a substance is dissolved in water during a chemical reaction

What is (aq)?

200

The substances on the right side of a chemical equation

What are products?

300

The number of hydrogen atoms indicated on each side of this balanced equation: 

6H₂O + 2P₄ + 3Ba(OH)₂ → 2PH₃ + 3Ba(H₂PO₂)₂

What is 18?

400

The balanced chemical equation for: CaCl₂ + Na₃PO₄ → Ca₃(PO₄)₂ + NaCl (unbalanced)

What is 3CaCl₂ + 2Na₃PO₄ → Ca₃(PO₄)₂ + 6NaCl ?

Types of Chemical Reactions

100

C₃H₈ + 5O₂ → 3CO₂ + 4H₂O

What is a combustion reaction?

200

BaCl_2 (aq) + Na₂SO_4 (aq) → BaSO_4 (s) + 2NaCl _(aq) 

What is a double replacement/displacement reaction, more specifically a precipitation reaction?

300

When H₂CO₃ chemically reacts to form carbon dioxide and water

What is a decomposition reaction?

400

When aluminum and diatomic oxygen react to form aluminum oxide 

What is a synthesis reaction?

500

When silver and dihydrogen sulfide react to form silver sulfide and diatomic hydrogen

What is a single replacement/displacement reaction?

Stoichiometry (limiting reactants not included)

100

The molar ratio of the reactants in the following chemical equation: 8CO + 17H₂ → C₈H₁₈ + 8H₂O

What is 8 mol CO : 17 mol H₂ ?

200

The molar mass of Ca₃(PO₄)₂ 

What is 310.174 g/mol?

300

This conversion factor is used for EVERY stoichiometry problem

What is mole ratio?

400

The mass of sodium sulfide needed to react completely with 60.00 g of silver iodide in the following chemical reaction: 2AgI + Na₂S → Ag₂S + 2NaI

(60.00 g AgI / 1) x (1 mol AgI / 234.772 g AgI) x (1 mol Na₂S/ 2 mol AgI) x (78.046 g Na₂S / 1 mol Na₂S) = 9.972995076073807 =

9.973 g Na₂S

Enthalpy & Catalysts

100

Catalysts speed up chemical reactions by decreasing this

What is activation energy?

200

The substance acting as a catalyst in the following reaction: 2KClO₃ + MnO₂ → 2KCl + 3O₂ + MnO₂ 

What is MnO₂ ?

300

Enthalpy of a reaction when the amount of energy released from a reaction is greater than the amount of energy absorbed and the surroundings around the reaction feel hot 

What is -ΔH (negative enthalpy)?

400

If 180.0 g of ethanol (C₂H₅OH) undergoes complete combustion, and the enthalpy change for the combustion of ethanol is ΔH = –1367 kJ/mol, then THIS is the enthalpy change for this reaction in Joules

(180.0 g / 1 ) x (1 mol / 49.069 g) x (-1367 kJ / 1 mol) x (1000 J / 1 kJ) = 5,014,570 = 

-5,014,000 J or -5.014 x 10⁶ J

Acids, Bases, & Neutralization

100

An alkaline (basic) solution that has a pH of 13 has this type of ion dissolved within it

What is hydroxide (OH-)?

200

The acid in the following neutralization reaction: 

H₂SO_{4 (aq)} + Ca(OH)_{2 (aq)} → CaSO_{4 (aq)} + 2H₂O _(l) 

What is H₂SO₄?

300

The salt in the following neutralization reaction: 2HClO_{4 (aq)} + Ba(OH)_{2 (aq)} → Ba(ClO₄)_{2 (aq)} + 2H₂O _(l)

What is Ba(ClO₄)₂ ?

400

The dissociation equation for strontium hydroxide 

What is Sr(OH)₂ → Sr²⁺ + 2OH^- ?