Question

1. which two of the following characteristics are a reversible reaction?

a) single - sided arrow
b) reaction that can occur in not only the forward direction, but also the reverse direction.
c) double - sided arrow
d) reaction that only occurs to any great extent in the forward direction.

1. to represent that both processes can occur, the single - sided arrow of chemical equation is replaced with a double - sided arrow: aa( ) + bb( )? cc( ) + dd( )

true
false

1. a ______ system is one in which reactants and products cannot move in and out of the reaction vessel.

a) titration
b) chemical
c) open
d) closed

Explanation:

• For question 7: A reversible reaction can proceed in both forward and reverse directions and is represented by a double - sided arrow. A single - sided arrow represents an irreversible reaction and a reaction that only occurs to a great extent in the forward direction is mostly irreversible.
• For question 8: In a reversible reaction, to show that both forward and reverse processes can occur, a double - sided arrow is used instead of a single - sided arrow in a chemical equation.
• For question 9: In a closed system, reactants and products cannot move in and out of the reaction vessel. A titration is a method of analysis, a chemical is a substance, and an open system allows matter to enter and leave.

Answer:

1. B. reaction that can occur in not only the forward direction, but also the reverse direction, C. double - sided arrow
2. True
3. D. closed