Chemistry Lab Report

Lauren Mackey, Trevor Pitts, Jordan D-H, and Ethan Howell

Introduction

A.
Reactants : a substance that takes part in and undergoes change during a reaction.
Products : the compounds that are formed when a reaction goes to completion.
Coefficients : the numbers placed before the reactants in a chemical equation in order to balance it.

B.
- permanent change in color
- production of a gas
-production of light or heat
- the dissolving of a metal

Analysis of Reactions

Experiment 1:
a. There was a color change, and condensation formed, proving the existence of a produced gas.
b. A hydrate is a solid compound containing water molecules combined in a definite ratio.
c. The single reactant would label this reaction as decomposition.

Experiment 2:
a. it formed a precipitate, as well as creating a permanent color change.
b. It shows that there are two different chemicals reacting with each other.
c. Because there are two reactants that yield one product, it is a synthesis reaction.

d. 2KI+Pb(NO3)-->2KNO3+PbI2


Experiment 3:

a. a strong UV light was emitted.

b. The BrINClHOF elements are not able to exist alone, and must have a second atom.

c. This is a synthesis reaction
d. 2Mg + O2 --> 2MgO


Experiment 4:

a. smoke was produced during the reaction, and a high pitched sound was created when the heat of the flame hit the hydrogen.

b. cation: An ion or group of ions having a positive charge

anion: a negatively charged ion.

c. this experiment was a single replacement reaction

d. Zn + 2HCl --> ZnCl2 + H2

e. Hydrogen was what was collected.


Experiment 4:

a. condensation, and the reproduction of a flame.

b. catalyst: A substance, usually used in small amounts relative to the reactants, that modifies and increases the rate of a reaction without being consumed in the process.

c. this is a decomposition reaction

d. 4HO2 --> 2H2O + 3O2

e. Oxygen, because it speeds up the combustion process.

Conclusion

a. Physical or chemical?
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. physical

b.
symbol: (s) :: means: solid :: experiment #: 4 :: chemical: zinc metal
symbol: (l) :: means: liquid
symbol: (g) :: means: gas :: experiment #: 5 :: chemical: hydrogen
symbol: (aq) :: means: aqueous (dissolves in water) :: experiment #: 4 :: chemical: hydrochloric acid