During this lab, we tested different types of reactions in several experiments. This lab was to teach us the differences between the types of reactions and to notice what each kind can look like. This lab had seven different sections to it.
During this experiment, we filled test tube half way up with hydrochloric acid. The test tube was then placed into the rack while another test tube (empty) was placed into a test tube holder. Then, we dropped a strip of magnesium ribon into the acid and quickly placed the empty test tube over the top of the full one to trap the gas inside the top. This made the hydrochloric acid bubble as gas rose out of the test tube. We let the gas fill up the empty test tube for a while, and then got a match ready. We pulled the gas filled test tube off the top of the acid filled on and then lit the match. When the match came in range of the gas, we observed a loud popping noise. We decided that this was a combustion reaction.
During this lab, we held a strip of magnesium ribon above a Bunsen burner. For a while, nothing appeared to be happening. Then, all of a sudden the flame from the bunsen burner changed color and the strip of magnesium ribon had become surrounded in a blinding white light. Carefully, we moved the glowing strip over a glass plate and when the light finally burned out, the strip crumpled onto the glass plate. The once shiny strip had turned into a white, fragile mess. We decided this was a combustion reaction once again.
In this lab we took a piece of sandpaper and rubbed down a piece of copper. Then, we held it over a bunsen burner for a while. For a long time, it seemed like nothing occurred. However, we noticed that when the metal was held over the fire, the part that was touching the flame became a darker color and returned to its original color once it cooled back down.
During this lab, we put a little bit of ammonium carbonate into a test tube. Then, since the lab procedure told us to, we wafted the smell of the test tubes contents. One of my partners, Damon, said it smelled strongly of cat pee, but I disagreed. I decided that it smelt like hair dye. Later that day our teacher, Mr. Ludwig, confirmed that ammonia is found in hair dye and that is what the smell should have reminded us of. We held the test tube above the bunsen burner and the smell got stronger as it turned into a gas.
During this lab, we filled a test tub half up with hydrogen peroxide. Then, we prepared another test tube to capture the gas that escaped the reaction happening in the first test tube. Then, we dropped a piece of manganese dioxide into the hydrogen peroxide and covered the top of the test tube with the empty one. While we waited for the gas to build up, we lit a splint on fire and then blew out the fire so we had just a glowing ember lit at one end of the splint. Finally, we pulled the gas filled one away from the reaction site and put the glowing ember of the splint into the gas. This lit our splint back on fire. If you were fast enough, you could get two trials of this experiment in one try.
In this lab, we poured a little bit of potassium iodide into a test tube. Then we added lead nitrate into a second test tube. Both of the liquids were clear and had little to no color to them. Then, we poured the lead nitrate into the potassium iodide. This made the mixed substances turn to the color yellow.
During this lab, we put a small amount of copper 2 carbonate into a test tube. Then, we placed the test tube over a bunsen burner and covered the top with another test tube to capture the gas. While we were waiting on the gas, we lit a wooden splint. Then, we pulled the gas filled test tube away and put the flaming splint into the top of the test tube of gas. Immediately the flame was put out when it came into contact with the gas.