. The electrolysis of water into hydrogen and oxygen is an example of ______ reaction. A. Combination C. double replacement B. Decomposition D. single replacement
Directions: Read and understand each item and choose the letter of the correct answer. You can just answer letters no need to put explaination but if u want too its okay :))
4. The
A. Combination C. double replacement
B. Decomposition D. single replacement
5. What scientific law is explained using balanced chemical equations?
A. Law of
B. Law of conservation of energy D. law of definite proportions
6. Which of the following symbols means a substance is in water solution?
A. (aq) C. (l)
B. (s) D. (w)
7. When oxygen is available, sulfur dioxide is produced from the burning of sulfur. Which of the following
word equations best represents this reaction?
C. A. sulfur + oxygen → sulfur dioxide C. sulfur dioxide → sulfur + oxygen
D. B. sulfur dioxide + oxygen → sulfur D. sulfur → sulfur dioxide + oxygen
8. In a chemical equation, the symbol that takes the place of the word ‘yield’ is a(n)
A. Equal sign C. plus sign
B. Coefficient D. arrow
9. The symbol(s) written after a formula in a chemical equation stands for
A. Soluble C. solid
B. Solution D. synthesis
10. Why can’t you change the formula in order to balance a reaction?
A. The number of atoms in the left should be equal to the atoms on the right of the arrow.
B. The elements have definite mass ratios.
C. The molecule is indestructible.
D. The elements that combine have definite composition and fixed proportion of elements by mass.
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