Names
Homeroom
Chemistry Marathon
Key Concepts
1. Exothermic (gives of energy in the form of heat)/Endothermic (absorbs
energy so surroundings get cold)
2. Physical/Chemical Change (check textbook if you’ve forgotten)
3. List all reactants and products
4. Corrosion (the chemical degradation or eating away of metals, rusting is a
specific example of iron corrosion with oxygen) or combustion (The highly
exothermic reaction of any C,H,O compound with oxygen gas)
5. identify all substances as molecular or ionic
6. Naming the compounds/Writing the equation
At each of the stations perform the experiment, OBSERVE and comment on EACH
of the key concepts and how they relate to that particular experiment.
A. The first is a demonstration of Moses’ Handkerchief. Put isopropyl alcohol
and water in a beaker. Add a piece of paper towel. Remove it from the
beaker and light it on fire.
C3H8O(l) +O2(g)  H2O(g) + CO2(g) + heat
1, exothermic or endothermic?
2, Physical/Chemical change or both? In the equation for the reaction,
water is one of the products. What about the water that we mixed in with
the alcohol? Technically it was a reactant, but why do you not see it on the
reactant side?
3, Reactants/products?
4, Corrosion/combustion?
5, Molecular/ionic
6, Name all the substances
B. Tear up tiny pieces of aluminum foil, drop them into a test tube. Add 2
pipettes of hydrochloric acid. Label your test tube and leave in the rack
until you are done with the paper work. Observe later
HCl(aq) + Al(s)  H2(g) + name the product you think should go here
(hint: Look at the reactants; it is a new combination of them)
1, Exothermic or endothermic (feel the test tube)?
2, Physical/chemical change
3, Reactants/products
4, Corrosion/combustion?
5, Molecular/ionic
6, Name all the substances
C. USE EXTREME CAUTION WITH THE MATCHES!!! Place a sugar cube
in a crucible dish. Using a match, light a portion of the cube on fire.
C12H22O11(s) + O2(g) CO2(g) + H2O(g) + heat
1. Exo or endothermic?
2, Physical/chemical change
3, Reactants/products
Look in your textbook on page 150 and write and memorize the equation for
the combustion of glucose (made by plants in photosynthesis). This chemical
reaction (cellular respiration) occurs billions of times every day in your body
to make energy required for everything imaginable. The photosynthesis
reaction is actually cellular respiration in reverse!)
4, Corrosion/combustion?
5, Molecular/ionic
6, Name all the substances
D. Place 1 pipette of silver nitrate into a test tube. Add 1 pipette of sodium
iodide. Observe.
AgNO3(aq) + _write the formula_(aq) _write the formula_(s) + NaNO3(aq)
1. Exo or endothermic?
2, Physical/chemical change
3, Reactants/products
4, Corrosion/combustion?
5, Molecular/ionic
6, Name all the substances
E. Take a test tube and add 2 pipettes of hydrogen peroxide. Using a
thermometer, measure its temperature. Add a piece of potato to the test
tube. Wait 10 seconds and retake the temperature.
H2O2(aq) + C6H10O5(s) ____ + ____ + heat
1. Exo or endothermic?
2, Physical/chemical change
3, Reactants/products
4, Corrosion/combustion?
5, Molecular/ionic
6, Name all the substances
F. In a test tube place 1 pipette of copper II sulphate. Add a small piece of
steel wool (which is pure iron). Observe. Heat the test tube in a hot water
bath. Observe. Fe + CuSO4 + heat  Cu(s) + FeSO4
1. Exo or endothermic?
2, Physical/chemical change
3, Reactants/products
4, Corrosion/combustion?
5, Molecular/ionic
6, Name all the substances
G. Add ½ pipette of hydrochloric acid onto a watch glass. Add ½ tablet of
calcium hydroxide (anti-acid). Observe.
HCl(aq)+ Ca(OH)2(s) ____ + ____
1. Exo or endothermic?
2, Physical/chemical change
3, Reactants/products Hint: to figure the products out, imagine this
reaction taking place in your stomach and you have taken the anti-acid to
counteract the pain from too much stomach acid. What is a neutral,
harmless product?
4, Molecular/ionic
5, Name all the substances
H. Cut a small slice of potato and drop 3 drops of iodine onto the potato.
Observe.
I2(l) + C6H10O5(s)  too complicated for grade nine
1, Endo or exothermic?
2, Physical/chemical change
3, Reactants only
4, Corrosion/combustion?
5, Molecular/ionic
6, Name substances
I. With a toothpick, write your name using lemon juice on a strip of filter
paper. Air Dry. Using tongs, hold the filter paper loosely on the hot plate.
Do not let the paper burn. Place waste in the container provided.
Cellulose of paper + acidic lemon juice  sugars which burn
Use this station to work on some other reactions not quite done
J. The last is a demonstration that involves cleaning tarnished silver
Silver sulphide + aluminum  silver + aluminum sulphide
1, Endo or exothermic?
2, Physical/chemical change
3, Reactants/products
4, corrosion/combustion? This is a corrosion! Which metal is being
corroded?
5, molecular/ionic
6, give chemical formulas for all reactants and products