3rd QUARTER ACTIVITY 2: Chemical CHANGE CHECKLIST Direction: Check (/) all the appropriate signs or evidences observe in the given situation. Most
of the activities can be only 1 evidence or 2 or more evidence.

No.
Activities/
Evidences

Change
in color

Change
in odor

Change
in taste
With
gas

with
precipitate

Light/heat
is given off

1. Burning of wood
2. Ripening of
fruits
3. Souring of milk
4. Frying fish
5. Lighting a
matchstick
6. Tarnishing of
spoon and fork
7. Explosion of
dynamite
8. Rusting of
metals

9.
Mixing baking
soda and
vinegar
10. Fireworks
display

"among the transition metal elements, manganese and zinc have a slight lowering of electronegativities. the reason behind this is that the nuclear charges of these elements are slightly weaker than the other transition metal elements due to the way their valence electrons are filled up. both manganese and zinc have their valence electrons filled up to the 4th shell with 1 pair of electrons (4s2) completely occupying it. although the electrons in the 3rd shell (3d) are yet to be paired since the outer most shell is filled up, the ability of the nucleus to attract electrons is lessened. hence,   the electronegativity (or the ability to attract electrons) is lessened."