Chemical Reactions Lab Report

By: Jake Griffin, Elizabeth Quinn, Noelle Thompson

A. Introductions

Reactants are the substances added together in order for a reaction to occur. In a chemical reaction, the reactants are on the left side of the arrow. Products are
the substance that is produced when the reactants are added together. In a chemical reaction, the products are on the right side of the arrow. Coefficients are the number multiplied by the given substance. Coefficients are the number that is on the left side of the substance. The four observations that show that a chemical reaction has taken place are, Bubbling/Fizzing, Change in Temperature, A light being produced, Gas produced.

Definitions

Reactants: The substances added together in order for a reaction to occur.

Products: The substance that is produced when the reactants are added together.

Coefficients: The number multiplied by the given substance.

4 Observations

1.Bubbled/fizzed

2.Change in temperature

3.Produced extremely bright light

4.Dark Gas was produced

B. Analysis of Reactions

Analysis of Experiment #1: Copper (II) Sulfate Pentahydrate Crystals decompose to form Copper (II) Sulfate and Water.

  1. The copper (II) sulfate pentahydrate crystals turned from their original light blue color to a brown, yellow. Also when the powder changed from the powder to the solid, it fizzed and bubbled.

  2. Hydrate: A compound in which water molecules are chemically bound to another compound or an element.

  3. Because there was only one reactant and two products were produced, this reaction was decomposition.

Analysis of Experiment #2: Potassium Iodide reacts with Lead (II) Nitrate to yield...

  1. We know this is a chemical reaction because the Potassium Iodide solution turned yellow when we added the Nitrate solution.

  2. “Reacts with” represents the plus sign (+) in a chemical equation. it means the reactants are being put together to cause a reaction.

  3. This reaction was a double replacement because there were two compounds as the reactants which then produced two different compounds as the products.

  4. The equation for this experiment is: 2KI+Pb(NO3)2 → 2K(NO3)+PbI2

Analysis of Experiement #3: Magnesium reacts with Oxygen Gas to form...

  1. We know this was a chemical reaction because it produced an extremely bright fire and changed the color of the metal.

  2. Because Oxygen is one of the “BrINClHOF” elements it means that there are two oxygen atoms on the reactants side of the equation.

  3. This reaction was combustion because when all the reactants (Magnesium & Oxygen) were added together, fire was produced.

  4. The equation for this reaction is: 2Mg+O2 → 2MgO

Analysis of Experiment #4: Zinc Metal reacts with Hydrochloric Acid to produce…

  1. We know this was a chemical reaction because a loud high-pitched squeaking noise was produced.

  2. A catalyst is a substance that increases the rate of a chemical reaction without itself undergoing any permanent chemical change.

  3. This reaction was a single replacement because

  4. The equation for this reaction is: 2Zn +2HCl → H2 +2Zn Cl

  5. In this reaction the wooden splint’s reignition was caused by the Oxygen in the Hydrogen Peroxide.

Experiment 4: Zinc Metal Reacts with Hydrochloric Acid to Produce...

C. Conclusion

i. dissolving salt in water: physical

ii. melting ice: physical

iii. milk turning “sour”: chemical

iv. burning fireworks: chemical

v. a 2-liter bottle going flat: physical

vi. frying an egg: physical


Symbols: What it Means Experiment # Chemical Used

(s) solid 1 Copper (II) Sulfate Pentahydrate Crystals

(l) liquid

(g) gas 4 Hydrochloride Acid

(aq) aqueous 2 Lead (II) Nitrate

Analysis of Experiment 5

  1. The evidence that we have that showed us that a chemical reaction took lace is that the substance turned black and it bubbled and fizzed.
  2. A catalyst is a substance that is increased, but it does not go through a chemical reaction.
  3. This experiment is a decomposition reaction.
  4. The equation of this experiment is H2O2 > 2H + O2.
  5. When we were putting the wooden stick in the test tube the flame, the flame weakened and eventually went out. This was caused by the oxygen in the reaction.