chemical reactant and products

• Splint tests- 

  1. Lit splint goes out - CO2
  2. Lit splint pops - H2 
  3. Glowing splint relights - O2
• Evidence of a chemical reaction- 

  1. Bubbles - new substance formed (gas)
  2. Odor - new substance formed (gas)
  3. Heat - exothermic (gives heat off) or endothermic (absorbs heat)
  4. Color change - new substance formed (solid precipitate)
  5. Sound - pop (H2 splint), hissing sound (gas)
  6. Smoke - new substance formed (solid particles in the air)
  7. Glow (associated with heat)
• Splint tests:

  • Lit splint goes out indicates the presence of CO2
  • Lit splint pops indicates the presence of H2
  • Glowing splint relights indicates the presence of O2
• Evidence of a chemical reaction:

  • Bubbles indicate a new substance formed (gas)
  • Odor indicates a new substance formed (gas)
  • Heat can be exothermic (gives off heat) or endothermic (absorbs heat)
  • Color change indicates a new substance formed (solid precipitate)
  • Sound: pop (H2 splint), hissing sound (gas)
  • Smoke indicates new substance formed (solid particles in the air)
  • Glow is associated with heat
• Safety Precautions:

  • Wear safety goggles and gloves at all times
  • 6 M HCl and 6 M NaOH solutions are corrosive
  • If spilled on skin, immediately flush with water and notify the instructor
• Chemical Reactants & Products:

  1. Sodium hydrogen carbonate reaction:

  • NaHCO3 (s) → Na2CO3 (s) + H2O (g) + CO2 (g)
  • Heat change: exothermic
  • New substance formed
  • CO2 produced; splint went out
  • Type of reaction: Decomposition
• 2. Calcium metal reaction:

  • Ca (s) + 2 H2O (l) → Ca(OH)2 (s) + H2 (g)
  • Bubbling
  • Smoke
  • Heat change: exothermic
  • Color change from black to yellow
  • H2 produced; splint popped
  • Type of reaction: Single replacement
• 3. Copper II nitrate and sodium carbonate reaction:

  • Cu(NO3)2 (aq) + Na2CO3 (aq) → 2 NaNO3 (aq) + CuCO3 (s)
  • New substance formed: light blue solid precipitate
  • Type of reaction: Double replacement
• 4. Zinc metal and 6M HCl reaction:

  • Zn (s) + 2 HCl (aq) → ZnCl2 (aq) + H2 (g)
  • Bubbling
  • H2 produced; splint popped
  • Type of reaction: Single replacement
• 5. Hydrogen peroxide and manganese IV oxide reaction:

  • 2 H2O2 (aq) → 2 H2O (l) + O2 (g)
  • Smoke
  • O2 produced; glowing splint relit
  • Type of reaction: Decomposition
• 6. Copper II carbonate and 6M HCl reaction:

  • CuCO3 (s) + 2 HCl (aq) → H2O (g) + CO2 (g) + CuCl2 (aq)
  • Turns green
  • Bubbling
  • CO2 produced; splint went out
  • Type of reaction: Double replacement, then decomposition
• 7. Aluminum metal and copper II chloride reaction:

  • 3 CuCl2 (aq) + 2 Al (s) → AlCl3 (aq) + 3 Cu (s)
  • Heat
  • Rust (color change from silver to brown)
  • Type of reaction: Single replacement, also a redox reaction
• 8. Steel wool and oxygen reaction:

  • Fe (s) + O2(g) → 2 Fe2O3 (s)
  • Color change from light gray to dark gray
  • Became more compact/condensed
  • Heat change: exothermic
  • Type of reaction: Synthesis, also a redox reaction
• 9. Copper metal and 6M HCl reaction:

  • Cu (s) + HCl (aq) → No reaction
  • No evidence of a reaction
  • Type of reaction: Single replacement
• 10. Hydrochloric acid and sodium hydroxide reaction:

  • HCl (aq) + NaOH (aq) → NaCl (aq) + H2O (l)
  • Bubbling
  • Odor
  • Heat change: exothermic
  • Type of reaction: Double replacement
• 3.Copper II nitrate and sodium carbonate reaction: Original. Cu(NO3)2 (aq) + Na2CO3 (aq) → 2 NaNO3 (aq) + CuCO3 (s) Ionic Equation: Cu+2 (aq) + 2NO3- (aq) + 2Na+ (aq) + CO3-2 (aq) → 2Na+ (aq) + 2NO3- (aq) + CuCO3 (s) Net ionic equation:  Cu+2 (aq) + CO3-2 (aq) → CuCO3 (s)