1. CHEMICAL BONDING INVESTIGATION
AIM: Depending on the substances, we had to find out if it has ionic bonding or not.
HYPOTHESIS: As we know, each substances have their own properties, so we
thought that depending on these and by melting, dissolving it or putting electricity,
we would know if it has ionic bonding. Depending on each action we were able to
discover if it has or not.
VARIABLE:
DEPENDENT:
We measured:
-The amount of substances we tested.
-We used a bunsen burner (so we can melt it) and with all the substances
we used the same so there was no way the melting point change.
-When we dissolved it, we used the same amount of water (40 ml) and the
same size of beaker. Also the same temperature of the water and it was
between cold and hot.
INDEPENDENT:
We changed the amount of water, every team did a different amount of
water and we thought that changing it would change our results
CONTROLLED:
As our experiment progressed, we used the same amount in every substance. As I
said we melt it with the same bunsen burner so it won’t depend on the gas or any
thing. We kept the flame at the same level (low) so every substance melts in the
same point of fire.
At the same time, we had to hold the substance in the same distance, so by holding
the crocodile clips, and a ruler we measured and we didn’t move it from that point.
When we used electricity, we put it in the same level each test, so it won’t change.
APARATUS:
Ruler
Beaker
Water
Bunsen burner
Thumbnail pipets
Meter stick
Stop watch
Electric circuit
Crocodile clips
2. PROCEDURE:
MELTING:
1- Measured the solid substance with the thumbnail pipette.
2- Put it in the crocodile clips.
3- With the ruler, we measured the distance between our hand and the flame.
4- Checked the level of the flame.
5- We turned the gas on.
6- Introduced the substance on the flame.
7- Maria melted it and I took notes.
8- We took the time, if it was more than a minute; we realized that is never
going to melt.
DISOLVING
1- Put the water in the beaker, must be at 40
ml.
2- we measured it with the thumbnail pipette.
3- dissolved it
4- 1 substance did not dissolve completely so we can say it partially dissolved.
5- some substances did not dissolve so we realized that they were negative.
USING ELECTRICITY
1- We measured the substance
2- We introduced the substance.
3- Connected the two crocodile clips
4- We turned on
*When it reacted, the substance e smelled. This showed us the properties of
each substance.
RESULTS:
CONCLUSION:
When a substance has ionic bonding, it won’t melt. If it dissolves, it does contain
ionic bonding. When we used the electricity if the light came on we realized that it
conducts electricity, which means it contains ionic bonding.
SUBSTANCE MELTING DISOLVING ELECTRICITY
A YES YES NO
B YES NO (PARTIALLY) NO
C NO NO NO
D NO YES YES
E NO YES NO (smelled like a
pool)
3. My partner was Maria Gomez, and we worked very well together. I liked this
activity because I was able to see and smell the substances so I could understand
better the chemical bonding.
