Question

A-E

Properties of Gases Exercise 1: Gas and Flame Tests Data Table 1. Gas Observations Step/Reaction Observations Zn+ 2HCl> ZnCl₂ + H₂(g) hydrochloric acid Hydrogen Gas + Flame H219)+flame -> catehe fire Reaction between manganese and H2OM n catalyst hydrogen peroxide Oxygen Gas + Smoldering toothpick Oz+s moldering toothpick -> - bursts into flame Gas Mixture + Flame |ZH₂(g) + O2(g) → 2H₂O (1) Questions: A) What gas was produced by the reaction of zinc and hydrochloric acid? How did this gas behave in the presence of flame? B) Write a balanced chemical equation describing the reaction of Zn and hydrochloric acid. C) What gas was produced by the decomposition of hydrogen peroxide? What happened when the smoldering toothpick came in contact with the gas? D) Write a chemical equation describing the reaction of Mn and hydrogen peroxide. E) Compare the behavior of the mixture of gases in the presence of flame. How would you test whether an unknown gas sample contains hydrogen or oxygen?

Answer 1

1) Data Table 1: Gras observation Stek Observation Reaction between Bubbled and start Zn and HCl to rise the top. Gas is released in form of .bubbles. • Hydrogen gas of gas explode with and flame popping sound. The flame went out. Reaction between omnt 402 Mno, +420 Mn and H22 H₂O2 m 2H₂O +Q(9) • O2+ Smoldering when the Smoldering toothpick toothpick came into contact with oz get started burning ragain. the toothpick glowed and was reignited. otras Gas • The toothpick glowed mixture + flame followed by popping Sound and then flame went out. A Zn + 2HCl = Znel + H₂ (g) The gas produced is hydrogen . In the presence of a fire, Hydrogen explodes with a popking sound. The popping sound put out the flame B) Zn + 2HCl = zne 2 + H₂(g) CS Samse Betanced Equation

e) The decomposition of H₂O2 produced - Oxygen gas. When smoldering .. tot toothpick came into contact with Oxygeng it started brwining again and slowly went out. D with Reaction of Mn and Hals, here decomposition of H20; occurs and Mn acts as a catalyst here: H₂O2 decomposed to produce water and Oxygen gas t e 2H₂02 mn 2H20 (1) 02 (g) 2 catalyst E) Behaviour of gas misture : - Oxygen mixed with Hydrogen gas when exposed to a flame made a popping Sound, Mixture of gas prodice Less amount of Heat and Solitary gas produce Large amount of heat. ' procedure to Determine Hz and a gas : Smoldering Toothpick was put in an inverted Tube of H2 g Hz burns with a squeakly pop, If the Toath kick rolights with the gas will be oxygen. CamScanner . an . 0.