1. Chemical Reactions 8.5E Chemical Reactions Re-templated JPh 7/31
Matter and Energy
Chemical Reactions
Part I: Chemical Reactions and Equations
CaCl2 + Na2CO3 → CaCO3 + 2NaCl
Is this equation balanced? ______________________________________________________________________
Circle the reactants and place a box around the products.
Write the equation as a sentence. ____________________________________________________________________________________________________________________________________________
Na2CO H2O → 2NaOH + H2CO3
Is this equation balanced? ______________________________________________________________________
Write the equation as a sentence. ____________________________________________________________________________________________________________________________________________
Na2CO3 + 2CH3COOH → 2NaCH3COO + H2CO3
Is this equation balanced? ______________________________________________________________________
What are the four signs of a chemical reaction?
______________________________________________________________________
8.5E Chemical Reactions
Re-templated JPh 7/31 1 1

2. Part II: Signs of a Chemical Reaction Using Known Reactants
Chemical Reactions
Matter and Energy
Part II: Signs of a Chemical Reaction Using Known Reactants
Fill in your own information first, and then collect the rest of the data from your lab group (and share your own).
Physical Properties (observed with hand lens)
Observations During a Chemical Reaction when Mixed with Water
Observations During a Chemical Reaction when Mixed with Vinegar
Calcium Chloride
Magnesium Sulfate
Sodium Carbonate
Citric Acid 2

3. Part III: Identifying Unknown Reactants
Chemical Reactions
Matter and Energy
Part III: Identifying Unknown Reactants
Fill in your own information first, and then collect the rest of the data from your lab group (and share your own).
Physical Properties (observed with hand lens)
Observations
During a Chemical Reaction when
Mixed with Water
Observations During a Chemical Reaction when Mixed with Vinegar
Which Unknown Reactants?
Mixture A
Mixture B
Mixture C
Mixture D 3

4. Reflections and Conclusions
Chemical Reactions
Matter and Energy
Reflections and Conclusions
How were the chemical reactions of the white solids similar? How were they different? ___________________________________________________________________________________________________________________________________________________________________________________________________________________________
Was a new substance with new properties produced when Unknown mixture A was combined with water or vinegar? Explain. __________________________________________________________________________________________________________________________________________________
Was a new substance with new properties produced when Unknown mixture B was combined with water or vinegar? Explain. __________________________________________________________________________________________________________________________________________________
Was a new substance with new properties produced when Unknown mixture C was combined with water or vinegar? Explain. __________________________________________________________________________________________________________________________________________________
Was a new substance with new properties produced when Unknown mixture D was combined with water or vinegar? Explain. __________________________________________________________________________________________________________________________________________________
What was the identity of your unknown mixture? What evidence leads you to believe this? ___________________________________________________________________________________________________________________________________________________________________________________________________________________________
Which of the unknown solids together could be used to make a cold pack? _________________________________________________________________________
Which of the unknown solids could be used to make a heat pack? _________________________________________________________________________ 4