Chemical Reactions

The hypothesis If a chemical reaction occurs, then there will be indicators of a chemical change, was supported throughout this experiment. Throughout this experiment there were several reactions that took place, and an indicator of such chemical reactions could be seen throughout each one. The first piece of identifiable evidence was present in the first step, which was when copper (II) nitrate and sodium hydroxide were combined. When stirred, a blue precipitate formed at the bottom of the test tube, the color of the solution changed from sky blue to teal blue, a slight color change but still noticeable, and heat was released causing the test tube to warm up slightly. In this one step there were three indicators of a chemical reaction supporting
This is learned by identifying and recording observations to show that energy is involved in a chemical change and by observing the change of color, production of gas, formation of a precipitate as well as release of energy as heat and light. Throughout this experiment there were several pieces of evidence that show evidence of a chemical change. When copper (II) nitrate and sodium hydroxide were combined, a blue precipitate formed at the bottom of the test tube, the color of the solution changed, and heat was released when the test tube started to warm up slightly. Another indicator of a chemical change was when hydrochloric acid was mixed with copper (II) oxide and the color of the solution changed from blue to brown. When copper (II) hydroxide was heated, and the solution changed into a brown coffee color, evidence of a chemical change was present, due to the fact that a color change occurred during the reaction. When the aluminium wire was placed in copper (II) chloride there was evidence of a chemical change, this includes production of has, color change, as well as release of energy as heat. The evidence and observations that were taken during the lab then helped to determine if a chemical reaction took place and also provided evidence to support the hypothesis. On the topic of chemical reactions, these occur every day in the real world. Even in the real world evidence of chemical change is present, such as production of heat and light, gas, formation of a precipitate and even color change. For example when energy or fire is added to candle wax, heat is produced, which is evidence of a chemical reaction. When a bike if left in the rain, the water reacts with the iron causing it to rust, and change color. Chemical reactions take place all around us, and with most reactions there is an indicator of such chemical