AP Chemistry Flashcards: Representations Of Reactions

What this deck covers

This deck focuses on Representations Of Reactions, giving you a quick way to review the definitions, rules, and examples that matter most for AP Chemistry.

How to use these flashcards

Work through these flashcards in short sessions. Try to answer each prompt before flipping the card, then revisit any cards you miss until the explanation feels automatic.

Flashcard 1: Balance the equation: $\text{KClO}_3 \rightarrow \text{KCl} + \text{O}_2$

Answer: $2 \text{KClO}_3 \rightarrow 2 \text{KCl} + 3 \text{O}_2$. Balance potassium and chlorine first, then oxygen.

Flashcard 2: What is the symbol for a catalyst in a chemical equation?

Answer: Above the arrow. Catalysts are written above the reaction arrow.

Flashcard 3: State the formula for the combustion reaction of ethanol: $\text{C}_2\text{H}_5\text{OH}$

Answer: $\text{C}_2\text{H}_5\text{OH} + 3 \text{O}_2 \rightarrow 2 \text{CO}_2 + 3 \text{H}_2\text{O}$. Complete combustion of alcohol produces $\text{CO}_2$ and $\text{H}_2\text{O}$.

Flashcard 4: What does a balanced chemical equation represent?

Answer: Equal number of each type of atom on both sides. Atoms are conserved - same number before and after reaction.

Flashcard 5: What is the result of combustion reactions in terms of energy?

Answer: Exothermic process. Combustion releases energy as heat and light.

Flashcard 6: What is the product of a complete combustion of hydrocarbons?

Answer: $\text{CO}_2$ and $\text{H}_2\text{O}$. Complete oxidation yields only these two products.

Flashcard 7: What type of reaction is $\text{AB} \rightarrow \text{A} + \text{B}$?

Answer: Decomposition reaction. One compound breaks down into two or more simpler substances.

Flashcard 8: Balance the equation: $\text{Fe} + \text{O}_2 \rightarrow \text{Fe}_2\text{O}_3$

Answer: $4 \text{Fe} + 3 \text{O}_2 \rightarrow 2 \text{Fe}_2\text{O}_3$. Balance iron atoms first, then oxygen atoms last.

Flashcard 9: Which type of reaction involves the breaking down of a compound into simpler substances?

Answer: Decomposition reaction. Single reactant splits into multiple products.

Flashcard 10: What is the role of a catalyst in a chemical reaction?

Answer: Speeds up the reaction without being consumed. Lowers activation energy but remains unchanged after reaction.

Flashcard 11: Identify the state of matter for $H_2O (l)$ in a chemical equation.

Answer: Liquid. The $(l)$ symbol specifically denotes liquid state.

Flashcard 12: Balance the equation: $\text{KClO}_3 \rightarrow \text{KCl} + \text{O}_2$

Answer: $2 \text{KClO}_3 \rightarrow 2 \text{KCl} + 3 \text{O}_2$. Balance potassium and chlorine first, then oxygen.

Flashcard 13: What is the balanced equation for the reaction between $\text{HCl}$ and $\text{NaOH}$?

Answer: $\text{HCl} + \text{NaOH} \rightarrow \text{NaCl} + \text{H}_2\text{O}$. Acid-base neutralization produces salt and water.

Flashcard 14: Which symbol in a chemical equation indicates a liquid state?

Answer: $(l)$. Standard notation for liquid phase in chemical equations.

Flashcard 15: Which symbol in a chemical equation indicates a gaseous state?

Answer: $(g)$. Standard notation for gas phase in chemical equations.

Flashcard 16: Identify the reactants in the reaction: $2 \text{Na} + \text{Cl}_2 \rightarrow 2 \text{NaCl}$

Answer: $2 \text{Na}$, $\text{Cl}_2$. Starting materials that undergo chemical change.

Flashcard 17: What is the result of a precipitation reaction?

Answer: Formation of an insoluble solid. Creates a precipitate that settles out of solution.

Flashcard 18: What does the term 'stoichiometry' refer to in chemical reactions?

Answer: Quantitative relationships between reactants and products. Mathematical ratios between substances in balanced equations.

Flashcard 19: In the reaction $\text{A} + \text{B} \rightarrow \text{C}$, identify the reactants.

Answer: $\text{A}$, $\text{B}$. Reactants appear on the left side of the equation.

Flashcard 20: What is the product of the neutralization reaction between $\text{H}_2\text{SO}_4$ and $\text{KOH}$?

Answer: $\text{K}_2\text{SO}_4$ and $\text{H}_2\text{O}$. Acid neutralization forms salt plus water.

Flashcard 21: What is indicated by a double-headed arrow in a chemical equation?

Answer: Reversible reaction. Equilibrium arrows show reaction can proceed in both directions.

Flashcard 22: What type of reaction is $\text{C}_6\text{H}_{12}\text{O}_6 + 6 \text{O}_2 \rightarrow 6 \text{CO}_2 + 6 \text{H}_2\text{O}$?

Answer: Combustion reaction. Glucose burns in oxygen to produce energy.

Flashcard 23: Identify the coefficients in the equation: $2 \text{H}_2 + \text{O}_2 \rightarrow 2 \text{H}_2\text{O}$

Answer: 2, 1, 2. Coefficients balance atoms: 4H, 2O on left equals 4H, 2O on right.

Flashcard 24: What type of reaction is $2 \text{H}_2 + \text{O}_2 \rightarrow 2 \text{H}_2\text{O}$?

Answer: Combination reaction. Two elements combine to form a single compound.

Flashcard 25: What type of reaction is $\text{CaCO}_3 \rightarrow \text{CaO} + \text{CO}_2$?

Answer: Decomposition reaction. Calcium carbonate breaks down into two simpler compounds.

Flashcard 26: Which symbol in a chemical equation indicates a solid state?

Answer: $(s)$. Standard notation for solid phase in chemical equations.

Flashcard 27: Identify the type of reaction: $\text{AgNO}_3 + \text{NaCl} \rightarrow \text{AgCl} + \text{NaNO}_3$

Answer: Double replacement reaction. Cations and anions exchange between the two compounds.

Flashcard 28: Which type of reaction involves the exchange of ions between two compounds?

Answer: Double replacement reaction. Positive and negative ions switch partners between compounds.

Flashcard 29: State the law that requires chemical equations to be balanced.

Answer: Law of Conservation of Mass. Matter cannot be created or destroyed in chemical reactions.

Flashcard 30: Identify the products in the combustion of methane: $\text{CH}_4 + 2 \text{O}_2 \rightarrow \text{CO}_2 + 2 \text{H}_2\text{O}$

Answer: $\text{CO}_2$, $2 \text{H}_2\text{O}$. Complete combustion produces carbon dioxide and water.

Flashcard 31: What type of reaction is $\text{AB} + \text{CD} \rightarrow \text{AD} + \text{CB}$?

Answer: Double replacement reaction. Both compounds exchange their positive and negative ions.

Flashcard 32: What type of reaction is $2 \text{H}_2 + \text{O}_2 \rightarrow 2 \text{H}_2\text{O}$?

Answer: Combination reaction. Two elements combine to form a single compound.

Flashcard 33: What is meant by 'reaction stoichiometry'?

Answer: Proportional relationships in a balanced equation. Molar ratios from coefficients in balanced equations.

Flashcard 34: What type of reaction is $\text{Zn} + 2 \text{HCl} \rightarrow \text{ZnCl}_2 + \text{H}_2$?

Answer: Single replacement reaction. Zinc displaces hydrogen from hydrochloric acid.

Flashcard 35: Which symbol in a chemical equation indicates an aqueous solution?

Answer: $(aq)$. Indicates dissolved in water solution.

Flashcard 36: Identify the type of reaction: $\text{H}_2 + \text{Cl}_2 \rightarrow 2 \text{HCl}$

Answer: Combination reaction. Two elements combine to form one compound.

Flashcard 37: What does the Δ symbol above the arrow in a chemical equation indicate?

Answer: Heat is applied. Delta indicates thermal energy is required for the reaction.

Flashcard 38: What is the general form of a chemical equation?

Answer: $\text{Reactants} \rightarrow \text{Products}$. Shows direction from starting materials to final products.

Flashcard 39: Balance the equation: $\text{C}_3\text{H}_8 + \text{O}_2 \rightarrow \text{CO}_2 + \text{H}_2\text{O}$

Answer: $\text{C}_3\text{H}_8 + 5 \text{O}_2 \rightarrow 3 \text{CO}_2 + 4 \text{H}_2\text{O}$. Balance carbon first (3), then hydrogen (8), finally oxygen (10).

Flashcard 40: What is meant by 'reaction stoichiometry'?

Answer: Proportional relationships in a balanced equation. Molar ratios from coefficients in balanced equations.

Flashcard 41: What type of reaction is $\text{A} + \text{BC} \rightarrow \text{AC} + \text{B}$?

Answer: Single replacement reaction. One element replaces another in a compound.

Flashcard 42: What is the balanced equation for the synthesis of water from $\text{H}_2$ and $\text{O}_2$?

Answer: $2 \text{H}_2 + \text{O}_2 \rightarrow 2 \text{H}_2\text{O}$. Combination of hydrogen and oxygen gases forms water.

Flashcard 43: State the formula for the synthesis of ammonia: $\text{N}_2 + \text{H}_2$

Answer: $\text{N}_2 + 3 \text{H}_2 \rightarrow 2 \text{NH}_3$. Haber process combines nitrogen and hydrogen gases.