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Daily Directions • Pick up the GREEN attachment from the front counter • Look over the Procedures and Data Table on the attachment • Complete your Hypothesis o When you are set on your prediction, WRITE OVER YOUR HYPOTHESIS IN PEN o Research Question: What evidence will you use to determine if a chemical reaction has occurred when two or more substances are combined? o Hypothesis: If I combine 2 or more substances, I will know a chemical reaction has occurred by… 52 Chemical Reactions Lab Research Question: What evidence will you use to determine if a chemical reaction has occurred when two or more substances are combined? Hypothesis: If I combine 2 or more substances, I will know a chemical reaction has occurred by… Materials: 52 Chemical Reactions Lab Research Question: What evidence will you use to determine if a chemical reaction has occurred when two or more substances are combined? Hypothesis: If I combine 2 or more substances, I will know a chemical reaction has occurred by… Materials: • • • • Variables: Controlled: • • • • Responding (Dependent): Manipulated (Independent): • • • • Chemical Reactions Lab 53 54 Chemical Reactions Lab Conclusion: Chemical Reactions Lab 53 52 Chemical Reactions Lab Research Question: What evidence will allow you use to determine if a chemical reaction has occurred when two or more substances are combined? Hypothesis: If I combine 2 or more substances, I will know a chemical reaction has occurred by… Materials: • Test tubes (2) • Permanent marker • Test tube rack • Vinegar • Graduated cylinder • Thermometer • Calcium chloride(B) Variables: Controlled: Responding (Dependent): Manipulated (Independent): • • • • Plastic scoop Baking soda (A) Test tube brush Lab sponge Chemical Reactions