![]() Replay the reaction and use the available tools ( Thermometer, Phenol red, Glowing splint, Burning splint. There is color change, as well as bubbles and precipitation.Ĭ. What evidence do you see that a chemical reaction is taking place? Water, to brownish orange, to a foggy white color.ī. I see that as the liquids mix, there is a type of gas released that isįizzing up and the color of the liquid changes from regular looking Review: In this reaction, hydrogen peroxide is added to a potassium iodide solution.Goal: How does the mass change (or not change) during a chemical reaction? Reactant 1 and Potassium iodide for Reactant 2. The products of the reaction relate to both of these tests because there How do the products of the reaction relate to the phenol red test and the splint test? (Chemicals that contain the hydroxide ion (OH–) are bases.)Ĭ. These symbols represent sodium hydroxide and hydrogen gas. The product of this reaction is NaOH+ H2. What are the reactants in this reaction?ī. Click Play, and wait for the reaction to end. Drag the Phenol red next to the flask of water. Indicator that is yellow in an acid, orange in a neutral solution, and pink in a base.Ī. Indicator, which is a substance that changes color in the presence of an acid or a base. Observe: Two families of chemicals are acids and bases. ![]() Was this reaction exothermic or endothermic? Exothermic In the Gizmo, drag the Thermometer into the flask of water.ī. In an endothermic reaction, heat is absorbed and the Is released and the temperature of the system rises. Observe: Some chemical reactions release heat, and others absorb heat.Question: What kinds of evidence indicate a chemical change has taken place? In this activity, you will look at many kinds ofĮvidence that chemists use to see if a chemical change has taken place. ![]() Physical changes, which do not create new substances. Introduction: It is important to distinguish chemical changes, in which new substances are formed, from The formation of precipitation also is released. I think a chemical reaction has taken place because the color has changed and bubbles ![]()
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