AP Chemistry

A compound has a half-life of 14 min. How much time will it take a 12 mol sample to decay to 1.5 mol?

• 14 min

• 28 min

• 42 min

• 56 min

What is the rate law for this reaction?

• rate = k[X]0

• rate = k[X]

• rate = k[X]²

• rate = -k[X]²

Tags

NGSS.HS-PS1-5

How much heat does an aluminum block absorb if 10.00 grams ae heated from 25.0^oC to 50.0^oC? the specific heat of aluminum is .900J/g^oC

• 450

• -450

• 225

• -225

Tags

NGSS.HS-PS3-1

Thermal energy always moves:

• From a high temperature object to a lower temperature object.

• From a lower temperature object to a higher temperature object.

• From an object with lower kinetic energy to an object with higher kinetic energy.

• From an object of higher mass to an object of lower mass.

Tags

NGSS.HS-PS3-4

What is the oxidation number of N in NO₂^1- ?

• -3

• +4

• -2

• +3

In the reaction Zn + H₂O --> ZnO₂ + H₂
 which element, if any, is oxidized? 

• Zinc

• Hydrogen

• Oxygen

• None

CO₂, with a pressure of 124 kPa, and Ar, with a pressure of 98.0 kPa are mixed into a container. If 7 liters of Cl₂ with a pressure of 115 kPa is then added to the mixture, what is the total kPa?

• 224 kPa

• 337 kPa

• 107 kPa

• 1027 kPa

A container is filled with H₂ and H₂O. Calculate the partial pressure of H₂ when the pressure of water is 45 torr. The total pressure of the gases is 750 torr.

• 767.5 torr

• 705 torr

• 42.86 torr

Based on Coulomb's law, as the distance gets farther and farther between charges, the magnitude of force ___.

• increases

• decreases

• stays the same

Tags

NGSS.HS-PS2-4

The electronegativity of Cl is the highest in Period 3. Why?

• Cl is the largest and has the greatest effective nuclear charge

• Cl is the smallest and has the lowest effective nuclear charge

• Cl is the largest and has the lowest effective nuclear charge

• Cl is the smallest and has the greatest effective nuclear charge

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2