1. TEKS 8.5D recognize that chemical formulas are used to identify substances
and determine the number of atoms of each element in chemical formulas
containing subscripts
TEKS 8.5F recognize whether a chemical equation containing coefficients is
balanced or not and how that relates to the law of conservation of mass
Balancing
Chemical
Equations
9. Products are shown to
the right of the yield
sign arrow.
Fe + 2 HCl
reactants
FeCl2 + H2
products
yield
sign
10. The products formed in a
chemical reaction have
different properties from the
reactants.
11. A yield sign
Fe + 2 HCl FeCl 2 + H 2
is used to show the
direction of the
chemical reaction.
12. A chemical equation is read
like this:
1 atom
of iron
reacts
with
2 molecules
of
hydrochloric
acid
to yield
1
molecule
of Iron
chloride
and
1
molecule
of
hydrogen
Fe + 2 HCl FeCl2 + H2
13. During a chemical reaction, atoms
cannot be created or destroyed,
so the number of atoms at the
beginning of a reaction MUST
equal the number at the end of
the reaction!
15. This law also means that
the mass of the reactants
must equal the mass of the
products.
16. What if the number of
atoms in the reactants
does not match the
number in the products?
17. C3H8 + O2 CO2 + H2O
mass =76 grams
3-carbon
8-hydrogen
2-oxygen
mass = 62 grams
1-carbon
2-hydrogen
3-oxygen
18. The Law of Conservation of Mass
says that the number of each
atom must be equal on both
sides of the yield sign along
with the masses. Let’s balance
the equation using some basic
rules.
26. mass = 204 grams =>mass = 204 grams
If we mass the reactants
and products before and
after the reaction, the
masses are equal. We have
followed the law!
C3H8 + 5O2 => 3CO2 + 4H2O
27. Ating tuklasin ang talasalitaan sa ating aralin.
Tukuyin ang salitang-ugat at kasingkahulugan ng
mga sumusunod na salita.
Salitang - ugat Kasingkahulugan
Halimbawa
kinalubugan lubog kinabaunan
namiminsala
luminga-linga
kinatatakutan
nakapagtago
batisan
28. TALASALITAAN.
Tukuyin ang salitang kasalungat ng mga salitang
may salungguhit sa bawat bilang.
1. Nang magawi siya sa isang talon upang
magpahinga nakita niya ang dalaga.
2. Nabughani siya sa kagandahan nito.
3. Maaring pinasalang niya ako nang mahuli niya
akong naliligo sa kanyang lupain.
nagpunta nanggaling nagmula
nainis naakit nagalit
pinagpala iningatan pinatay
29. TALASALITAAN.
Tukuyin ang salitang kasalungat ng mga salitang
may salungguhit sa bawat bilang.
4. Mahabag ka sa kanya Ama, tulad ng
pagkahabag niya sa akin, wika ng dalaga.
5. Piliin ninyo ang pinakamahusay nating mandirigma
upang makatunggali ng binatang ito, utos ng hari.
maawa magalit magpuyos
makalaban magalit maibigan
30. Ating tuklasin ang talasalitaan sa ating aralin.
Tukuyin ang salitang-ugat at kasingkahulugan ng
mga sumusunod na salita.
Salitang - ugat Kasingkahulugan
Halimbawa
kinalubugan lubog kinabaunan
Kasaganahan
Nangamba
nagmasid
lumanghap
umusbong
31. Ating tuklasin ang talasalitaan sa ating aralin.
Ibigay ang kahulugan ng mga sumusunod na salita
at gamitin sa pangungusap.
1. karamutan
2. naligaw
3. napadako
4. nakalawit
5. pumitas