1. Calcium
By: Erica, Nicole & Leighara

2. Properties Chemical Physical Fairly soft Shiny silver surface when cut
Calcium surface becomes dull upon contact with oxygen forming a white/ grey calcium oxide
Density – 1.54g/cm^3
MP – 850 C
BP – 1440 C
Active- reacts with oxygen
Reacts with Halogens
Reacts with cold water, most acids and most non-metals. Example: sulfur phosphorous

3. Hypothesis
As a group, we predicted that using calcium as a reactant would
produce a base. We predicted this because of previous research
before beginning our experiment. Back in our notes, we saw an
example of this type of reaction. We knew that calcium resides
within us, so it can’t be a dangerous metal but can still react in
some way. This is when we concluded it was a base.

4. Acid or Base?

5. Formula: metaloxide + water  base
We came up with this formula from our notes (Types of
Reactions). From looking at a synthesis reaction, we discovered
that a metal + oxygen = a metaloxide. From there, adding water
with a metal oxide produces a base.
The equation is:
CaO(s) + H2O(l)  Ca(OH)2 (aq)
Therefore, BASE !

6. Materials Procedure 100 mL test tube Weigh boat Scoopula
Graduated cylinder
100 mL beaker
pH strip
Calcium
water
Procedure
Measure 10mL of water in a test tube.
Add a dash of calcium to the water. Allow time for the calcium to react with the water.
Place a pH strip into the 100 mL beaker. Pour the solution on the strip. What colour does it turn?
Check the pH scale to determine if an acid or a base was produced.

7. How did ours react ?
In the bottle, the calcium appeared to be white/grey. This was due to
the oxygen contact. However, underneath the white calcium, the solid
appeared to look almost black. This was because it was not exposed to
the air.
When we added the calcium to the water, it hesitated for a few seconds
then started to form a gas. The pieces of calcium floated to the top,
while continuing to form its gas. The water then began to form a white
layer on top of the water. Nicole shook it a bit to see if it would do
anything else, and the water turned completely to an opaque
substance.

8. PPP and PPE Clean spills Wash hands Have hair tied back
Air exchange vents / fume hood
Apron
Goggles

9. Evidence

10. Referring back to our hypothesis, we were correct
Referring back to our hypothesis, we were correct. The product was a base.
We figured this out by first using our notes. Mrs. Coristine provided us with an
exact example of the reactant calcium going through the stages of becoming a
base. We also knew this from testing the product with a pH strip. When we
performed this experiment, the strip turned to a purple colour. Referring back to
the pH scale, purple was the highest colour with a pH level of 13. This means
the solution is a base. Lastly, going into our resource book, the reaction chart
showed us just this. Calcium is part of the first 8 chemicals that have a strong
reactivity. Those chemicals mix with oxygen to first create peroxides. Then
when added to water, it creates a gas. This sums up all of our reasoning for
why this product is a basic solution. Therefore, Calcium is a
BASE!