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Background An example of a gas would be hydrogen. A chemical property is how a substance changes its identity. An example of this would be being able to support flammability. A physical property distinguishes one type of matter from another and can be observed without changing its identity. An example of this is somethings boiling point because when you change a liquid to a gas it does not change its identity only its form. A chemical change is when something changes identity and example of this would be burning something because you are changing the substances identity.
An example of a physical change would be chopping wood because it is still wood just in pieces. An exothermic reaction is when something lets off heat to make a change. An example of an exothermic reaction is turning water to ice because the water needs to cool down and let off energy to exist as a solid and that is why ice cubes are cold. An endothermic reaction is when a substance needs to gain heat and takes it in. An example of this would be water turning into gas because gas needs a lot of energy and that is why when you apply heat to water it turns into a gas. Purpose To determine the properties of the gas, hydrogen, by generating the gas though a chemical change and identifying the gas by performing a simple test.
Hypothesis For my hypothesis, I think that the burning splint will react by making the flame get slightly bigger. I think that hydrogen is less dense than air is. Materials vinegar Mg. Ribbon goggles test tube wooden splint. lighter Procedure First thing, we had to obtain the vinegar and make cualitative observations about it and do the same with the Mg ribbon. Then we had to roll the Mg ribbon into a ball and it to the vinegar.
After adding the Mg ribbon, we had to quickly put our thumb over the vial and make observations of what was having during the reaction. After waiting four minuets. After that, we had to light a wooden splint on fire. I took my thumb off the test tube and applied the burning splint. Then observed about the reaction.
Conclusion For my hypothesis, I was partly correct about what would happen when the burning splint was applied to the vial because the flame did grow larger but it also made a noise as well. I was correct about saying that it was less dense than air because when we uncapped the thumb the hydrogen rushed out making the flame jump as well as showing it supports flammability. The chemical properties of the gas hydrogen would be that it supports flammability because when it rushed out of the vial the flame jumped with it. The physical properties would be that is colorless tasteless and has no scent or odor. The proof that we had a chemical reaction is that when the Mg ribbon was added to the vinegar and it caused bubbling and an exothermic reaction as well as the dissolving of the Mg ribbon. More proof that there was a chemical reaction was that there was a new substance created and we could find this because we saw the flame make a noise and grow larger for a few seconds.
The gas hydrogen was used to make the flame bigger. Hydrogen used to be used in blimps because it was less dense than air and elevates the blimp but since hydrogen is flammable a spark lit the blimp on fire and it crashed and it is not used in blimps anymore. The blimps we see know are only used for commercial uses and are less likely to light a flame than the larger dirigibles. Source of error One source of error in the experiment was that we did not have our thumb completely over the vial and some of the gas got away making the reaction smaller. The second source of error would be we did not get the splint down fast enough and some of the gas escaped.
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Research essay sample on Chemical Reaction Test Tube
