20. In a chemical reaction, dynamic equilibrium occurs when the rate of the forw

ID: 782282 • Letter: 2

Question

20. In a chemical reaction, dynamic equilibrium occurs when the rate of the forward reaction becomes precisely equal to the rate of the reverse reaction. All of the following statements are true EXCEPT

A. A dynamic equilibrium occurs when the reaction is more than 50 percent complete.

B. In a dynamic equilibrium, reactants are converted to products at the same rate as products become reactants.

C. Reactions that reach a dynamic equilibrium are often referred to as reversible reactions.

D. Reactions that reach a dynamic equilibrium are shown with a double arrow, to indicate the forward and reverse reactions.

E. Reactions that reach equilibrium very close to the end (product side) are usually shown with only one arrow instead of a double arrow and we say the reaction goes to completion

1. Valence shell electron pair repulsion (VSEPR) theory is based on which of the following concepts?

A. The concept that electrons in a molecule will repel each other due to their negative charge.

B. The concept that valence electrons repel each other due to their small size.

C. The concept that valence electrons are attracted to protons found in the nucleus of the atom, since electrons are negatively charged while protons carry a positive charge.

D. The concept that electrons are very large particles and occupy a large amount of space inside a molecule.

E. The concept that valence electrons are attracted to the nucleus of an atom and therefore will spread as little as possible from each other.

1. A gas is placed in a container at a certain pressure and then conditions change so that the pressure is doubled. Which of the following changes would double the pressure?

1. Doubling the volume.
2. Reducing the volume to one-half.
3. Doubling the temperature (Kelvin scale).
4. Reducing the temperature (Kelvin scale) to one-half.
5. Both the volume and temperature (Kelvin scale) would need to be changed at the same time.