Quickly seal the conical flask with the stopper. Place 1 spatula-full of manganese dioxide powder into the conical flask and add 3 ml of hydrogen peroxide solution.3-5 Lab Activity 2 Teacher Edition - Chemistry of Gases ( Members Only).3-5 Lab Activity 2 SE - Chemistry of Gases (Doc).3-5 Lab Activity 2 SE - Chemistry of Gases (PDF).Here are the worksheets and documents you will need for this lab activity. Oxygen is very reactive and is flammable, producing both heat and light in some reactions. Our atmosphere consists of approximately 20% oxygen, the rest is mainly nitrogen with a few other gases present in much lower percentages. This level increases dramatically with activity. At rest, an average-sized person uses approximately 20 liters of oxygen an hour. Oxygen is an essential ingredient in aerobic respiration, the reaction which allows our cells to release the energy from the food that we eat. We cannot live without oxygen – our bodies need a constant supply. Take a lit taper, remove your finger, and carefully place it in the mouth of the cylinder.Place your finger or thumb over the mouth of the cylinder to keep the gas inside. Once the measuring cylinder is full of gas (there is no water left in it) loosen the clamp and lift it out of the water, tilting it slightly upwards.Secure the measuring cylinder with the clamp stand. Place the delivery tube under the inverted measuring cylinder as seen in the diagram below.Place 2-3 pieces of zinc metal into the conical flask and add 10ml of dilute HCl.Turn the cylinder upside down so that the mouth is resting on the bottom of the basin. Place the measuring cylinder in the water basin and allow it to fill with water.Half fill the water basin with cold water.Watch the hydrogen gas demonstration completed by your teacher and record your observations in the space provided on page 2 of this lab activity. 3-5 Lab Activity 1 Teacher Edition - Chemistry of Gases ( Members Only).3-5 Lab Activity 1 Student Edition - Chemistry of Gases (Doc).3-5 Lab Activity 1 Student Edition - Chemistry of Gases (PDF).Unlike petrol it produces zero carbon emissions and is deemed much better for the environment. This forms the basis for the hydrogen pop test and is the same reaction utilized in hydrogen fuel technology. In the presence of a flame hydrogen reacts so rapidly with the oxygen in the air that it explodes to produce water. Today hydrogen has been replaced by helium in modern airships because it is un-reactive. Hydrogen was also used in airships in the 20 th century due to its light nature, however after the Hindenburg disaster in 1937, airships quickly lost their popularity. The sun and stars consist mainly of hydrogen gas and it has been estimated that about 90% of the universe is made up of hydrogen. It is a highly reactive and explosive gas. Hydrogen is a colorless gas which is at least 15 times lighter than any other substance. They get my students engaged and wondering before we ever go into the meat of the lesson. When I introduce the Chemistry of Gases I always start with these 3 mini-labs.

Reactivity of oxygen activity table