Unit 5: Chemical Reactions Reactions and Equations Intro: Use your notes to answer the following topics ? Define chemical reaction: ? List and describe the 4 definite indicators of a chemical reaction: Give the one non definite indicator of a chemical reaction ? Describe why an atom would undergo a chemical reaction: Activity Melting Ice Cube Boiling Water Magnesiu m& Oxygen SrCl2 + NaOH Water & CaCl2 Zinc & HCl Unexpected Color Change ( Y or N) Precipitate (Y or N) Spontaneous Gas Production (Y or N) Change in Temp (Y or N) Production of light (Y or N) Type of Change (physical or chemical) Activity Color Change ( Yes or No) Precipitate (Yes or No) Spontaneous Gas Production (Yes or No) Change in Temp (Yes or No) Production of light (Yes or No) Type of Change (physical or chemical) Corn Starch & Iodine Solution Baking Soda, Calcium Chloride & Phenol Red Follow up Use the following example to help answer the following questions

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Unit 5: Chemical Reactions Reactions and Equations Intro: Use your notes to answer the following topics ? Define chemical reaction: ? List and describe the 4 definite indicators of a chemical reaction: Give the one non definite indicator of a chemical reaction ? Describe why an atom would undergo a chemical reaction: Activity Melting Ice Cube Boiling Water Magnesiu m& Oxygen SrCl2 + NaOH Water & CaCl2 Zinc & HCl Unexpected Color Change ( Y or N) Precipitate (Y or N) Spontaneous Gas Production (Y or N) Change in Temp (Y or N) Production of light (Y or N) Type of Change (physical or chemical) Activity Color Change ( Yes or No) Precipitate (Yes or No) Spontaneous Gas Production (Yes or No) Change in Temp (Yes or No) Production of light (Yes or No) Type of Change (physical or chemical) Corn Starch & Iodine Solution Baking Soda, Calcium Chloride & Phenol Red Follow up Use the following example to help answer the following questions. Sentence equation: Liquid water reacts with solid sodium to produce aqueous sodium hydroxide and hydrogen gas. Word equation: liquid water + solid sodium →aqueous sodium hydroxide + hydrogen gas formula equation: H2O (l) + Na (s) → NaOH (aq) + H2 (g) 1. Given the following sentence equation write the word and formula equation. Liquid tricarbon octahydride reacts with oxygen gas to produce carbon dioxide gas and liquid water. Word equation: Formula equation: 2. Given the following formula equation write the word and sentence equation. NaCl (aq) + Li (s) → LiCl (aq) + Na (s) Word equation: Sentence equation: 3. In the reaction below label the correct side as the products or reactants NaCl (aq) + Li (s) → LiCl (aq) + Na (s) ____________ ____________ The following questions must be answered in complete sentences for full credit. 4. Which of the combinations of items would you not write a chemical equation for? 5. SrCl2 and NaOH are both white substances, but for this lab they were placed in water. What is the state of matter for solid substances that have been placed in water? 6. How is this different then saying they are liquids? 7. Research question: Why do these items need to be placed in water for them to react and not just put the dry chemical together?