Law of Conservation of Mass – Balancing Equations
1. BRAINPOP: https://www.brainpop.com/science/matterandchemistry/conservationofmass
Username : alexmid
Password: brainpop
Take the classic quiz, what was your score? ______
2. CLOZE READING http://solpass.org/6-8Science/8s/Standards/standard_ps.5.htm
1.
Change of state is a ______________________ - boiling water will eventually cool down
2.
Matter can undergo physical and chemical changes. In _________________________,
the chemical composition of the ________________________________.
3.
Burning is a _________________________ - the wood is gone forever)
4.
In _________________________, ___________________ substances are formed.
5.
The _______________________________states that regardless of how substances
within a closed system are changed, the total ____________ remains the ___________. The
Law of Conservation of _____________ states that energy can not be __________ or
__________________ only changed from one form to another.
6.
A _________________________represents the changes that take place in a chemical
reaction. The chemical formulas of the _____________________ are written on the left; an
arrow indicates a change to new substances; and the chemical formulas of the
__________________ are written on the right.
7.
________________________ are classified into two broad types: ones in which
energy is released (_____________) and ones in which energy is absorbed
(____________________). The study of synthesis, decomposition, and replacement reactions
can be reserved for high school chemistry.
8.
Another type of change occurs in nuclear reactions. __________________energy is the
energy stored in the nucleus of an atom. In nuclear reactions, a small amount of matter
produces a large amount of energy.
9.
This energy can be released by joining atoms’ nuclei together (________________) or
by splitting atoms’ nuclei (___________________) resulting in the conversion of minute
amounts of matter to energy.
3. BRAINPOP:
https://www.brainpop.com/science/matterandchemistry/chemicalequations/
Username : alexmid
Password: brainpop
Take the classic quiz, what was your score? ______
4. Balancing of Chemical Equations for Beginners
https://www.youtube.com/watch?v=Q4WWiAm3nPM
1. Why is the equation H2 + O2 -> H20 unbalanced?
__________________________________________________________________
2. Rewrite the equation from above when it is balanced.
_____________________________________
3. Explain why Na + Cl2 -> NaCl is not balanced.
__________________________________________________________________
4. Write the new equation from above when it is balanced.
________________________
5. Balancing Equations
http://www.creative-chemistry.org.uk/gcse/revision/equations/index.htm
Choose "Balancing Equations" from Welcome Page, click on "Give Me One" icon at left side of
website. Enter values to balance equation. When correct, copy down equation on worksheet.
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6. Extra practice
http://www.sciencegeek.net/Chemistry/taters/EquationBalancing.htm