1. Product - B. Substance(s) present after a reaction
2. Coefficient - K. Number telling how many molecules of a substance are involved in a chemical reaction
3. Chemical Equation - I. Uses symbols and formulas to show chemical reactions
4. Reactant - F. Substance(s) present before a reaction
5. Chemical Change - J. A change in matter that produces new substances
6. Precipitate - L. A solid that forms from a solution during a chemical reaction
7. Endothermic Reaction - C. A reaction that absorbs energy in the form of heat
8. Chemical Formula - A. A combination of symbols that shows the ratio of elements in a compound
9. Subscript - H. Number telling how many atoms are in a molecule or the ratio of elements in a compound
10. Exothermic Reaction - D. A reaction that releases energy in the form of heat
11. Chemical Symbol - G. One or two letters used to represent an element
12. Law of Conservation of Mass - E. Principle that states that matter is not created or destroyed during a chemical reaction
Balancing Equations:
21. SiCl₄ → Si + 2Cl₂
- Reactants: Si (1), Cl (4)
- Products: Si (1), Cl (4)
Balanced: 1 SiCl₄ → 1 Si + 2 Cl₂
22. 4Na + O₂ → 2Na₂O
- Reactants: Na (4), O (2)
- Products: Na (4), O (2)
Balanced: 4 Na + 1 O₂ → 2 Na₂O
Multiple Choice:
23. d. The total number of atoms are equal on both sides
24. a. 2H₂ + N₂ → 2NH₃
Parent Tip: Review the logic above to help your child master the concept of overview chemical reactions worksheet.
