AP Chemistry Unit 7 Equilibrium

Which of the following processes has a negative △S

• evaporating 1 mol of a liquid

• freezing 1 mol of a liquid

• raising the temperature of 1 L of water from 295 K to 350 K

• None of the other answer are correct.

The sequence of steps that occurs in a reaction process is called the

• reaction mechanism.

• order of the reaction.

• rate law.

• overall reaction.

A species that changes the rate of a reaction but is neither consumed nor changed is

• a catalyst.

• an activated complex.

• an intermediate.

• a reaction.

Tags

NGSS.HS-PS1-5

The slowest step in a mechanism is called

• the uncatalyzed reaction.

• the rate - determining step.

• the activation step.

• none of the other answers are correct.

Tags

NGSS.HS-PS1-5

How does the energy of the activated complex compare with the energies of the reactants and products?

• It is lower than both the energy of the reactants and the products.

• It is higher than the energy of the reactants but lower than the energy of the products

• It is higher than both the energy of the reactants and the products.

• It is lower than the energy of the reactants but higher than the energy of the products.

Tags

NGSS.HS-PS1-4

A rate law relates

• energy and concentration.

• temperature and concentration.

• reaction rate and temperature.

• reaction rate and concentration.

Tags

NGSS.HS-PS1-5

A light metre rule is allowed to pivot freely at the zero end. The other end is supported by a spring balance. A weight of 200N is then hung at the 40cm mark. The metre rule stays horizontal. What is the reading on the spring balance?

• 80

• 40

• 8

• 4

Tags

NGSS.MS-PS2-2

NGSS.MS-PS2-4

What is the force F needed to balance the bar shown?

• 3

• 4

• 6

• 8

Tags

NGSS.HS-PS2-1

The figure shows a uniform metre rule pivoted at the 50cm mark. 125g and 200g weights hang from the rule as shown. Calculate where you would hang a 25g mass in order to balance the rule horizontally

• 20 cm from pivot on the side of 125 g mass

• 10 cm from pivot on the side of 125 g mass

• 40 cm from pivot on the side of 200 g mass

• 10 cm from pivot on the side of 200 g mass

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

NGSS.MS-PS2-4

A boy of weight 600N sits on the see-saw as shown at a distance of 1.5m from the pivot. What is the force F required at the other end to balance the see-saw?

• 450 N

• 350 N

• 4.5 N

• 200 N

Tags

NGSS.MS-PS2-2