Balancing… Equations Formative

1. During a chemical reaction, A. new elements are produced B. atoms are destroyed C. atoms are rearranged D. elements are destroyed

2. An equation is balanced by A. changing subscripts B. erasing elements as necessary C. adding coefficients D. adding elements as necessary

3. What are the reactants in the following chemical equation: Zn + CuSO > ZnSO4 + Cu A. zinc and copper B. zinc sulfate (ZnSO4 ) and copper C. zinc and copper sulfate (CuSO4 ) D. only zinc

4. What are the products in the following chemical equation: Zn + CuSO > ZnSO4 + Cu A. zinc and copper B. zinc sulfate (ZnSO4 ) and copper C. zinc and copper sulfate (CuSO4 ) D. only zinc

6. The law of conservation of mass states that __________. 6. The law of conservation of mass states that __________ A. in a chemical reaction, efforts should be made to preserve rare elements without changing them B. matter can be created and destroyed but does not change forms C. in a chemical reaction, the final mass of the products is always greater than the starting mass of the reactants D. in a chemical reaction, matter is not created or destroyed, but is conserved

5. The statement, "Mass can never be created nor destroyed" is the________ A. Law of conservation of mass B. Law of conservation of matter C. Law of conservation of energy D. Law of universal gravity

6. Which of the following can’t be changed when balancing equations? A. Coefficients B. Chemical Formula C. The number of atoms of each element initially present

7.How many total atoms of hydrogen are shown in the reactants below? 3Fe + 4H 2 O  Fe 3 O 4 + 4H

Complete the balancing equation portion of this formative now!