Introduction: In a chemical change, the identities of substances change and new substances form. In an equation the substances on the left are the reactants. The substances on the right are the products. In this experiment the objectives are to observe evidence that a chemical change has taken place. Infer from observations that a new substance has been formed. Identify and record observations that show energy is involved in chemical change observe the color, solubility of some substances and describe reactions by writing word equations.
Hypothesis: I hypothesize that a chemical reaction has occurred when there is a change in temperature, color. But also when there are bubbles and the evolution of gas.
Materials: The materials that were used were Aluminum wire(12 cm), beaker (100 mL), hot plate, copper(II) nitrate (1.0 M), glass stirring rod, gloves, HCl (1.0 M), lab apron , lab marker, NaOH (1.0 M), ruler, safety goggles, test tube (13 mm x 100mm) and test tube rack.
Procedure: Safety goggles, gloves, and lab apron were put on. (Only the ones who were doing the experiment) 50mL of water was placed in the 100mL beaker and heated until boiled. And the boiled water will be used as the water bath. The lab marker was used to make 3 marks (1 cm apart). 1.0 M copper (II) nitrate was added to the first mark on the test tube. 1.0 M sodium hydroxide (NaOH) was added up to the second mark on the test tube. The solutions were mixed with the stirring rod. The test tube was put into the water bath. The burner was turned off and the test tube was cooled. 1.0 M hydrochloric acid (HCl) was added to the third mark on the test tube and was mixed. The 12 cm piece of aluminum was placed in the test tube. The wire was removed from the test tube. Lab station and equipment were cleaned.
Observations: I observed that color change occurred and turned blue when Copper (II) nitrate and sodium hydroxide were stirred. Also precipitate was formed. When the test tube was