An Introduction to the Types of Reactions Science 10 Chemistry Unit

Your turn: Write a word equation and a chemical equation for the following problems. Be sure to: include the final equation states of matter include the final equation states of matter and balance and balance

1.magnesium + oxygen 2.hydrogen + oxygen 3.nitrogen reacts with another element to produce ammonia 4.aluminum reacts with oxygen 5.sulfur (S 8 (s) ) reacts with air to produce sulfur dioxide 6.carbon disulfide is produced by the reaction of carbon with sulfur (S 8 (s) )

Problem 1: Word Equation: magnesium + oxygen → magnesium oxide Chemical Equation: Mg (s) + O 2 (g) → Mg 2 O (s) Is it Balanced? 4 Mg (s) + O 2 (g) → 2 Mg 2 O (s)

Problem 2: Word Equation: hydrogen + oxygen → water Chemical Equation: H 2 (g) + O 2 (g) → H 2 O (l) Is it Balanced? 2 H 2 (g) + O 2 (g) → 2 H 2 O (l)

Problem 3: Nitrogen reacts with another element to produce ammonia Word Equation: nitrogen + hydrogen → ammonia Chemical Equation: N 2 (g) + H 2 (g) → NH 3 (l) Is it Balanced? N 2 (g) + 3 H 2 (g) → 2 NH 3 (l)

Problem 4: Word Equation: aluminum + oxygen → aluminum oxide Chemical Equation: Al (s) + O 2 (g) → Al 2 O 3 (s) Is it Balanced? 4 Al (s) + 3 O 2 (g) → 2 Al 2 O 3 (s)

Problem 5: Sulfur (S 8 (s) ) reacts with air to produce sulfur dioxide Word Equation: sulphur + oxygen → sulphur dioxide Chemical Equation: S 8 (s) + O 2 (g) → SO 2 (g) Is it Balanced? S 8 (s) + 8 O 2 (g) → 8 SO 2 (g)

Problem 6: Carbon disulfide is produced by the reaction of carbon with sulfur (S 4 (s) ). Word Equation: carbon + sulphur → water Chemical Equation: C (s) + S 4 (s) → CS 2 (s) Is it Balanced? 2 C (s) + S 4 (s) → 2 CS 2 (s)

1.nitrogen reacts with another element to produce ammonia 2.aluminum reacts with oxygen 3.sulfur (S 8 (s) ) reacts with air to produce sulfur dioxide 4.Carbon disulfide is produced by the reaction of carbon with sulfur

Formation or Synthesis Reactions 1.________Fe + ________O 2 → ________Fe 2 O 3 2.________Pt + ________S 8 → ________PtS 2 3.________CaO + ________H 2 O → _______Ca(OH) 2 4.________Na + ________I 2 → ________

5.________Mg + ________O 2 → ________ 6.________Mg + ________P 4 → ________Mg 3 P 2 7.________H 2 + ________Cl 2 → ________ 8.________CO + ________O 2 → ________CO 2 9.________Na 2 O + ________H 2 O → ______NaOH 10.________NO + ________O 2 → ________NO 2

11.________Na + ____ S 8 → ____ Na 2 S 12.________Mg + ________Cl 2 → ______ MgCl 2 13.________P + ________O 2 → ________P 4 O ________Cu + ________O 2 → ________Cu 2 O

Your turn: Write a word equation and a chemical equation for the following problems. Be sure to: include states of matter include states of matter and balance the final equation and balance the final equation

1.Decomposition of sodium chloride 1.Decomposition of sodium chloride 2.Chromium (III) oxide is decomposed into its elements 2.Chromium (III) oxide is decomposed into its elements 3.Nitrogen is produced from the decomposition of ammonia 3.Nitrogen is produced from the decomposition of ammonia 4.Mercury (II) sulfide breaks down into its elements 4.Mercury (II) sulfide breaks down into its elements 5.Decomposition of sodium hydroxide 6.Decomposition of potassium bromide 7.Decomposition of magnesium oxide 8.Decomposition of ammonium sulphate

Problem 1: Word Equation: Sodium chloride  sodium + chlorine Chemical Equation: NaCl (s)  Na (s) + Cl 2 (g) Is it Balanced? 2 NaCl (s)  2 Na (s) + Cl 2 (g)

Problem 2: Word Equation: Chromium (III) oxide  chromium + oxygen Chemical Equation: Cr 2 O 3 (s)  Cr (s) + O 2 (g) Is it Balanced? 2 Cr 2 O 3 (s)  4 Cr (s) + 3 O 2 (g)

Problem 3: Word Equation: ammonia  nitrogen + hydrogen Chemical Equation: NH 3 (l)  N 2 (g) + H 2 (g) Is it Balanced? 2 NH 3 (l)  N 2 (g) + 3 H 2 (g)

Problem 4: Word Equation: Mercury (II) sulfide  mercury + sulphur Chemical Equation: HgS (s)  Hg (s) + S 4 (s) Is it Balanced? 4 HgS (s)  4 Hg (s) + S 4 (s)

Or: Word Equation: Mercury (II) sulfide  mercury + sulphur Chemical Equation: HgS (s)  Hg (s) + S 8 (s) Is it Balanced? 8 HgS (s)  8 Hg (s) + S 8 (s)

Problem 5: Word Equation: sodium hydroxide → sodium + hydrogen + oxygen Chemical Equation: NaOH (s)  Na (s) + H 2 (g) + O 2 (g) Is it Balanced? 2 NaOH (s)  2 Na (s) + H 2 (g) + O 2 (g)

Problem 6: Word Equation: potassium bromide → potassium + bromine Chemical Equation: KBr (s)  K (s) + Br 2 (l) Is it Balanced? 2 KBr (s)  2 K (s) + Br 2 (l)

Problem 7: Word Equation: Magnesium oxide → magnesium + oxygen Chemical Equation: MgO (s)  Mg (s) + O 2 (g) Is it Balanced? 2 MgO (s)  2 Mg (s) + O 2 (g)

Problem 8: Word Equation: Ammonium sulphate → ammonia + hydrogen sulphate Chemical Equation: (NH 4 ) 2 SO 4 (s)  NH 3 (l) + H 2 SO 4 (l) Is it Balanced? (NH 4 ) 2 SO 4 (s)  2 NH 3 (l) + H 2 SO 4 (l)

Decomposition Reactions (Handout) 1. ____ NH 4 OH → ____ NH 3 + ____ H 2 O 2. ____ BaO → ____________ + ______________ 3. ____ NaCl → ____________ + ____________ 4. ____ Zn(OH) 2 → ____ ZnO + ____ H 2 O 5. ____ BaCO 3 → ____ BaO + ____ CO 2

6. ____ NH 4 NO 3 → ____ N 2 O + ____ H 2 O 7. ____ Al 2 O 3 → ____________ + ____________ 8. ____ KClO 3 → ____ KCl + ____ O 2 9. ____ NaClO 3 → ____ NaCl + ____ O 2 10.____ NH 4 NO 2 → ____ N 2 + ____ H 2 O