Chemistry Final Review Part 2

A scientist calculates the theoretical yield of an experiment to be 25.70g. They recover 12.76g. What is their percent yield?

• 49.65%

• 50.35%

• 65.21%

• 34.79%

A scientist calculates the theoretical yield of an experiment to be 91.80g. They recover 65.89*g. What is their percent yield?

• 71.78%

• 28.22%

• 84.22%

• 16.78%

82.3 g of Mg reacts with 57.9 g of N₂ to form Mg₃N₂. Which is the limiting reagent?

• Mg

• N₂

• Mg₃N₂

940.6g of CoF₃ react with 428.7 g of SF₄ to form SF₆ and CoF₂. Which is the limiting reagent?

• CoF₃

• SF₄

• SF₆

• CoF₂

The pressure in Elgin today was 29.63 in Hg. What is that pressure in psi?

• 14.53 psi

• 60.57 psi

• 29.63 psi

• 30.94 psi

What is 81.4 °F in K?

• 301 K

• 286 K

• 81.4 K

• 209 K

What happens to the particles of an IDEAL gas when they collide?

• The bounce off each other without losing any energy. The collisions are perfectly elastic. 

• The bounce off each other and lose some energy. The collisions are inelastic. 

• They stick together and go the same direction.

• They chemically react.

Tags

NGSS.HS-PS2-2

NGSS.HS-PS3-2

Which postulate of kinetic molecular theory disproves the following statement:

The size of the gas molecules directly affects the volume of the ideal gas.

• A gas consists of individual particles in constant and random motion.

• The volume of the individual gas molecules is small when compared to the distance between them.

• Collisions between molecules are perfectly elastic.

• The pressure of the gas is due entirely to the force of the collisions of the gas particles with the walls of the container.

0.640 mol of a gas occupies 15.8 L under certain conditions. How much of this gas would it take to occupy 38.5 L?

• 1.56 mol

• 9.50 mol

• 3.25 mol

• 6.19 mol

A gas has a pressure of 658 kPa, a volume of 3.44 L, and a temperature of 656K. How many moles of this gas are present?

• 0.415 mol

• 3.45 mol

• 28.67 mol

• 1.00 mol