(Honors) Chemistry Assessment Chemical Reactions
Balance the following equation: (NH₄)₂CO₃(s)→NH₃(g) + H₂O(g) + CO₂(g)
(NH₄)₂CO₃(s)→2NH₃(g) + H₂O(g) + CO₂(g)
Write a balanced chemical equation for the decomposition reaction: Ag₂O(s) →
2Ag₂O → 4Ag + O₂
Fill in the missing reactant, and then balance the equation: K(s) + _____________________ → KOH(aq) + H₂(g)
2H₂O(l) 2K(s) + _________ → 2KOH(aq) + H₂(g)
The following equation is incorrect. Find the errors, then rewrite and balance the equation: Na + O₂ → NaO₂
4Na + O₂ → 2Na₂O
Write a balanced chemical equation for the following: Ca(s) + S(s) →
Ca(s) + S(s) → CaS(s)
Balance the following equation: CaCl₂(aq) + H₂SO₄(aq) → CaSO₄(s) + HCl(aq)
CaCl₂(aq) + H₂SO₄(aq) → CaSO₄(s) + 2HCl(aq)
Write a balanced equation for the complete combustion of propanal (C₃H₆O).
C₃H₆O(l) + 4O₂(g) → 3CO₂(g) + 3H₂O(g)
Write a balanced equation for the complete combustion of butene (C₄H₈).
C₄H₈(g) + 6O₂(g) →4CO₂(g) + 4H₂O(g)
Write a balanced equation for the following double-replacement reaction: H₂C₂O₄(aq) + KOH(aq) →
H₂C₂O₄(aq) + 2KOH(aq) → K₂C₂O₄(aq) + 2H₂O(l)
Fill in the missing reactant, and then balance the equation: Bi(NO₃)₃(aq) + _____________ → Bi₂S₃(s) + HNO₃(aq)
H₂S(g) 2Bi(NO₃)₃(aq) + ______ → Bi₂S₃(s) + 6HNO₃(aq)
Write a balanced net ionic equation for the following reaction. The product that is not ionized is given: Na₂S + HCl --> [H₂S]
S²⁻(aq) + 2H⁺(aq) → H₂S(g)
Pieces of sodium and magnesium are dropped into separate water-filled test tubes (A and B). There is vigorous bubbling in Tube A but not in Tube B. Which tube contains the sodium metal?
Tube A
Identify the type of reaction when lead (II) nitrate reacts with potassium iodide
double-replacement
What type of reaction occurs when potassium oxide reacts with water
synthesis
Write the equation when aluminum reacts with bromine
2Al(s) + 3Br₂(l) → 2ALBr₃(s)
Use the activity series of metals to write a balanced chemical equation for the following single-replacement reaction: Al(s) + H₂SO₄(aq) →
2Al(s) + 3H₂SO₄(aq) → Al₂(SO₄)₃(aq) + 3H2(g)
Complete the equation and then write a net ionic equation: Al(s) + H₂SO₄(aq) -->
2Al(s) + 6H⁺(aq) → 2Al₃+(aq) + 3H₂(g)
Write a balanced chemical equation for the following decomposition reaction: aluminum is obtained from aluminum oxide with the addition of a large amount of electrical energy
2Al₂O₃ + energy → 4Al + 3O₂
Balance the following equation: PbO₂(s) → PbO(s) + O₂(g)
2PbO₂(s) → 2PbO(s) + O₂(g)
Balance the equation and identify its type: Hf(s) + N₂(g) → Hf₃N₄(s)
3Hf(s) + 2N₂(g) → Hf₃N₄(s) synthesis
Write a balanced chemical equation when sodium iodide reacts with phosphoric acid
3Nal + H3PO4 → 3HI + Na3PO4
Write a balanced net ionic equation for the following reaction. The product that is not ionized is given: NaOH + Fe(NO₃)₃ --> [Fe(OH)₃]
3OH⁻(aq) + Fe³⁺(aq) --> Fe(OH)₃(s)
Write a balanced net ionic equation for the following reaction: AgNO₃(aq) + AlCl₃(aq) → (silver chloride is a precipitate)
Ag⁺(aq) + Cl⁻(aq) →AgCl(s)
Write a balanced chemical equation for the following decomposition reaction: Silver carbonate decomposes into silver oxide and carbon dioxide when it is heated
Ag₂CO₃ -∆-> Ag₂O + CO₂
Write sentences that completely describe each of the chemical reactions shown in this skeleton equation: H₂SO₄(aq) + BaCl₂(aq) → BaSO₄(s) + HCl(aq)
Aqeous solutions of sulfuric acid and barium chloride are mixed to produce a precipitate of barium sulfate and aqueous hydrochloric acid
Why is smoking not permitted near an oxygen source?
Because a fire will burn faster in an area of high oxygen concentration
Fill in the missing reactant, and then balance the equation: Al(s) + _________________ → AlBr₃(s)
Br₂(l) 2Al(s) + 3Br2(l) → 2AlBr₃(s)
Write a balanced chemical equation for the single-replacement reaction that takes place in aqueous solution. Write "no reaction" if a reaction does not occur: Bromine reacts with aqueous barium iodide
Br₂(l) + Bal₂(aq) → BaBr₂(aq) + I₂(aq)
Write the equation when propane (C₃H₈) reacts with oxygen
C3H8(g) + 5O2(g) → 3CO2(g) + 4H2O(g)
When pale yellow chlorine gas is bubbled through a clear, colorless solution of sodium iodide, the solution turns brown. Write the net ionic equation
Cl₂(g) + 2I⁻(aq) → I₂(aq) + 2Cl-(aq)
Write a balanced chemical equation and use the necessary symbols to describe the reaction completely: Bubbling chlorine gas through a solution of potassium iodide gives elemental iodine and a solution of potassium chloride
Cl₂(g) + 2Kl(aq) → I₂(aq) + 2KCl(aq)
Write a balance chemical equation for the following synthesis reaction: dichlorine heptoxide + water
Cl₂O₇(l) + H₂O(l) → 2HClO₄(aq)
Write a balanced chemical equation when pentane (C₅H₁₂) reacts with oxygen
C₅H₁₂ + 8O₂ → 5CO₂ +6H₂O
Write a balanced equation for the complete combustion of the following compound (assume that the products are carbon dioxide and water): glucose (C₆H₁₂O₆)
C₆H₁₂O₆ + 602 → 6CO₂ + 6H₂O
Write a balanced chemical equation for the single-replacement reaction that takes place in aqueous solution. Write "no reaction" if a reaction does not occur: Steel wool (iron) is placed in sulfuric acid
Fe(s) + H₂SO₄(aq) → FeSO₄(aq) + H₂(g)
Write sentences that completely describe each of the chemical reactions shown in this skeleton equation: NH₃(g) + O₂(g) -(Pt)-> NO(g) + H₂O(g)
Gaseous ammonia and oxygen react in the presence of a platinum catalyst to produce nitrogen monoxide gas and water vapor
Write a balanced equation for the complete combustion of the following compound (assume that the products are carbon dioxide and water): ethanoic acid (HC₂H₃O₂)
HC₂H₃O₂ + 2O₂ --> 2CO₂ + 2H₂O
Complete the equation and then write a net ionic equation: HCl(aq) + Ba(OH)₂(aq) →
H⁺(aq) + OH⁻(aq) → H₂O(l)
Write a balanced net ionic equation for the following reaction: HCl(aq) + Ca(OH)₂(aq) →
H⁺(aq) + OH⁻(aq) →H₂O(l)
Write a balance chemical equation for the following synthesis reaction: hydrogen + bromine
H₂(g) + Br₂(g) → 2HClO₄(aq)
If sulfuric acid should not be stored next to sodium hydroxide, write a balanced chemical equation to support your answer.
H₂SO₄(aq) + 2NaOH(s) → Na₂SO₄(aq) + H2O(l)
What would happen if a match were struck in a room filled with oxygen?
It would burn more vigorously
Write a balanced chemical equation when potassium oxide reacts with water
K₂O + H₂O → 2KOH
Write a balanced chemical equation for the decomposition reaction: ammonium nitrate → dinitrogen monoxide + water
NH₄NO₃ → N₂O + 2H₂O
A yellow precipitate formed with aqueous solutions of sodium sulfide and cadmium nitrate were mixed in a beaker. Identify the spectator ions in the solution
Na+(aq) NO3-(aq)
Write a balanced chemical equation for the following decomposition reaction: Heating tin (IV) hydroxide gives tin (IV) oxide and water
Sn(OH)₄ ₋∆→ SnO₂ + 2H₂O
Write sentences that completely describe each of the chemical reactions shown in this skeleton equation: N₂O₃(g) + H₂O(l) →HNO₂(aq)
The gas dinitrogen trioxide reacts with water to produce an aqeous solution of nitrous acid.
Use the activity series of metals to write a balanced chemical equation for the following single-replacement reaction: Zn(s) + AgNO₃(aq) →
Zn(s) + 2AgNO₃(aq) → Zn(NO₃)₂(aq) + 2Ag(s)
Write balanced chemical equation for the double-replacement reactions that occur in aqueous solution: Zinc sulfide is added to sulfuric acid
ZnS(aq) + H₂SO₄(aq) → H₂S(g) + ZnSO₄(aq)
What is a distinguishing feature of every decomposition reaction?
a single reactant
What is a spectator ion?
an ion that does not participate in the reaction
Identify the type of reaction when propane (C₃H₈) reacts with oxygen
combustion
What type of reaction occurs when pentane (C₅H₁₂) reacts with oxygen
combustion
What type of reaction occurs when heating sulfuric acid produces water, oxygen and sulfur dioxide
decomposition
What type of reaction occurs when sodium iodide reacts with phosphoric acid
double-replacement
Complete the equation and then write a net ionic equation: Au(s) + HCl(aq) →
no reaction
Use the activity series of metals to write a balanced chemical equation for the following single-replacement reaction: Au(s) + KNO₃(aq) →
no reaction
Write a balanced chemical equation for the single-replacement reaction that takes place in aqueous solution. Write "no reaction" if a reaction does not occur: Mercury is poured into an aqeous solution of zinc nitrate
no reaction
Identify the type of reaction when copper reacts with aqueous silver nitrate
single-replacement
What type of reaction occurs when aluminum reacts with sulfuric acid
single-replacement
When pale yellow chlorine gas is bubbled through a clear, colorless solution of sodium iodide, the solution turns brown. What type of reaction is taking place?
single-replacement
Identify the type of reaction when aluminum reacts with bromine
synthesis
Write a balanced chemical equation when heating sulfuric acid produces water, oxygen and sulfur dioxide
2H₂SO₄ -∆-> 2H₂O + O₂ + 2SO₂
Write balanced chemical equation for the double-replacement reactions that occur in aqueous solution: solutions of potassium flouride and calcium nitrate are mixed
2KF(aq) + Ca(NO₃)₂(aq) → CaF₂(s) + 2KNO₃(aq)
Write a balanced chemical equation for the following: Mg(s) + O₂(g) →
2Mg(s) + O₂(g) → 2MgO(s)
The following equation is incorrect. Find the errors, then rewrite and balance the equation: NH₃ → N₂ + H₂
2NH₃ → N₂ + 3H₂
Pieces of sodium and magnesium are dropped into separate water-filled test tubes (A and B). There is vigorous bubbling in Tube A but not in Tube B. Write an equation for the reaction in the tube containing the sodium metal. What type of reaction is occurring in this tube?
2Na(s) + 2H₂O(l) → 2NaOH(aq) + H₂(g) single-replacement
Write the equation when copper reacts with aqeous silver nitrate
CU(s) + 2AgNO₃(aq) → Cu(NO₃)₂(aq) + 2Ag(s)
Write a balanced equation for the following double-replacement reaction: CdBr₂(aq) + Na₂S(aq) → (Cadmium sulfide is a precipitate)
CdBr₂(aq) + Na₂S(aq) → CdS(s) + 2NaBr(aq)
A yellow precipitate formed with aqueous solutions of sodium sulfide and cadmium nitrate were mixed in a beaker. Write the formula of the yellow precipitate.
CdS(s)
A yellow precipitate formed with aqueous solutions of sodium sulfide and cadmium nitrate were mixed in a beaker. Write the net ionic equation for the reaction
Cd²⁺(aq) + S²⁻(aq) --> CdS(s)
The following equation is incorrect. Find the errors, then rewrite and balance the equation: Cl₂ + NaI → NaCl₂ + I
Cl₂ + 2NaI → 2NaCl + I₂
Write a balanced net ionic equation for the following reaction. The product that is not ionized is given: H₂C₂O₄ + KOH → [H₂O]
H⁺(aq) + OH⁻(aq) → H₂O(l)
Balance the equation and identify its type: Mg(s) + H₂SO4(aq) →MgSO₄(aq) + H₂(g)
Mg(s) + H₂SO₄(aq) →MgSO₄(aq) + H₂(g) single-replacement
Write balanced chemical equation for the double-replacement reactions that occur in aqueous solution: Sodium hydroxide reacts with nitric acid
NaOH(aq) + HNO₃(aq) → H₂O(l) + NaNO₃(aq)
Write a balance chemical equation for the following combination reaction: sodium oxide + water
Na₂O(s) + H₂O(l) → 2NaOH(aq)
Should sulfuric acid be stored next to sodium hydroxide? Explain your answer
No. NaOH is a base, and bases should not be stored next to acids because reactions between these two classes of chemicals generate heat
Fill in the missing reactant, and then balance the equation: C₂H₅OH(l) + ___________ → CO₂(g) + H₂0(g)
O₂(g) C₂H₅OH(l) + _______ → CO₂(g) + H₂0(g)
Write the equation when lead (II) nitrate reacts with potassium iodide
Pb(NO₃)₂(aq) + 2Kl(aq) → Pbl₂(s) + 2KNO₃(aq)
Balance the equation and identify its type: Pb(NO₃)₂(aq) + NaI(aq) → PbI₂(s) + NaNO₃(aq)
Pb(NO₃)₂(aqA) + 2NaI(aq) →PbI₂(s) + 2NaNO₃(aq) double replacement
Write a balanced chemical equation and use the necessary symbols to describe the reaction completely: Solid tetraphosphorus decaoxide reacts with water to produce phosphoric acid
P₄O₁₀(s) + 6H₂O(l) → 4H₃PO₄(aq)
Identify the reactants and products in the chemical reaction: in photosynthesis, carbon dioxide and water react to form oxygen gas and glucose
Reactants: cardon dioxide and water Products: oxygen and glucose
Identify the reactants and products in the chemical reaction: hydrogen gas and sodium hydroxide are formed when sodium is dropped into water
Reactants: sodium and water Products: hydrogen and sodium hydroxide
Write a balanced chemical equation when aluminum reacts with sulfuric acid
2Al + 3H₂SO₄ → 3H2 + Al₂(SO₄)₃
Balance the equation and identify its type: C₂H₆(g) + O₂(g) →CO₂(g) + H₂O(g)
2C₂H₆g) + 7O₂(g) →4CO₂(g) + 6H₂O(g) combustion
Write a balanced equation for the complete combustion of the following compound (assume that the products are carbon dioxide and water): octane (C₈H₁₈)
2C₈H₁₈ + 25O₂ → 16CO₂ + 18H₂O
Balance the following equation: Fe(OH)₃(s)→Fe₂O₃(s) + H₂O(s)
2Fe(OH)₃(s)→Fe₂O₃(s) + 3H₂O(s)
Write a balanced chemical equation and use the necessary symbols to describe the reaction completely: Bubbles of hydrogen gas and aqueous iron (III) chloride are produced when metallic iron is dropped into hydrochloric acid
2Fe(s) + 6HCl(aq) → 2FeCl₃ (aq) + 3H₂(g)
Write a balanced chemical equation for the following: P(s) + O₂(g) →diphosphorus pentoxide
4P(s) + 5O₂(g) →2P₂O₅(s)
The equation for the formation of water from its elements, H₂(g) + O₂(g) → H₂O(l), can be "balanced" by changing the formula of the product to H2O2. Explain why this is correct.
A formula is a unique identifier of a substance. A different formula would indicate a different substance, not the one that is taking part in the reaction you are trying to balance.