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Reactants Lab. In this experiment we discovered three types of chemical reactions, Single and Double Replacement reactions, along with Neutralization Reaction.

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Introduction

Types of Reactions Design (D) Aspect 1: Problem: What type of chemical reactions occurs when different reactants are mixed? Variables: Manipulated: Combination of reactants Responding: Type of Chemical Reaction Controlled: 1. Same amount of reactants used (1 piece for solid's, 4 drops for liquid's) 2. Spot plate is washed before reactants are mixed 3. Same amount of time substance is allowed for chemical reaction to occur (15s) 4. Because data is qualitative, observations will be made by the same person. Aspect 2: Controlling Variables: The same amount of reactants being used will be controlled by using the same amount of reactants in each reaction (1 piece for solid's, 4 drops for liquids). Spot plate will be washed before each chemical reaction (using the water from the squeeze bottle) to ensure no residue is left from previous reaction. Observations will be made 15 seconds after the chemical raction. Time will be kept using a watch. The same person will make qualitative observations, to ensure that observations are kept consistent. ...read more.

Middle

barium hydroxide (aq) Ba(OH)2 (aq) Two transparent liquids Milky-white substance. Gas bubbles form. hydrochloric acid (aq) HCl (aq) magnesium hydroxide (aq) Mg(OH)2 (aq) Transparent liquids Transparent liquid hydrochloric acid (aq) HCl (aq) sodium acetate (aq) C2H3NaO2 (aq) Transparent liquids Transparent liquid calcium (s) Ca (s) water (l) H2O (l) Flaky-white solid, and transparent liquid Calcium dissolves a bit in water. A few gas bubbles zinc (s) Zn (s) copper (II) sulphate (aq) CuSO4 (aq) Grey rocky solid, with bluish liquid Gas bubbles form on zinc cobalt chloride (aq) CoCl2 (aq) magnesium hydroxide (aq) Mg(OH)2 (aq) Red liquid and clear liquid Pinkish-purple substance. Gas bubbles form magnesium (s) Mg (s) hydrochloric acid (aq) HCl (aq) Silver, lustrous metal and transparent liquid Gas bubbles form on magnesium sodium bromide (aq) NaBr (aq) chlorine (aq) Cl2 (aq) Transparent liquids Transparent liquid aluminum (s) Al (s) copper (II) chloride (aq) CuCl2 (aq) Lustrous rock and blue liquid Gas bubbles form on aluminum Aspect 2: Processing Data Chemical Reactants and Products Equations Balanced H2SO4(aq) ...read more.

Conclusion

Referring to Data in Aspect 2 & 3 of Data Collection and Processing, we can see there were 5 single replacement reactions, and 4 double replacement reactions (one of which was a neutralization reaction). The reactions involving an element and a compound were all single replacement reactions, and the reaction involving two compounds were double replacements (which included a neutralization reaction). Aspect 2: Evaluate the Procedure: A problem with this procedure is that it doesn't explore all types of chemical reactions. Also, try as one may, it is sometimes difficult to get the residue of a substance off the spot plate. This tampers with results. Aspect 3 Improving Experimental Design: A few more reactions should be added where simple composition and decomposition are shown. Also, using the Bunsen burner, a reaction should be added where hydrocarbon combustion is shown. Disposable spot plates should be used, to ensure that residue left by previous reactants and reactions, do not tamper with results. ?? ?? ?? ?? Page | 1 Syed Hasan ...read more.

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