Final Exam - Chemistry 2

In comparison with liquids and gases, solids are:

• more compressible

• more dense

• more likely fill their containers

• less organized

The average kinetic energy of particles of a substance is:

• equal to 0

• raised as the temperature of the substance is lowered

• not affected by the temperature of the substance

• directly proportional to the Kelvin temperature of the substance

Tags

NGSS.HS-PS3-2

All collisions between gas particles are said to be “elastic”. This means that:

• kinetic energy decreases after the collision

• kinetic energy remains constant after the collision

• potential energy decreases after the collision

• kinetic energy increases after the collision

Tags

NGSS.HS-PS2-2

The escape of gas molecules from the surface of an uncontained liquid is known as:

• melting

• sublimation

• evaporation

• condensation

Tags

NGSS.MS-PS1-4

A gas has a volume of 6,760 mL at 867 mm Hg and 87.2°C. What is the volume of the gas (in L) at STP?

• 5.84 L

• 45.3 L

• 0.00 L

• 24.1

At what pressure would 175 g of sulfur hexafluoride gas (SF₆) occupy a volume of 14,380 mL at 205°C?

• 0.713 L

• 0.306 L

• 0.00488 L

• 0.00209 L

Which gas effuses faster, carbon dioxide (CO₂), fluoride (H₂) or nitrogen (N₂)?

• CO₂

• H₂

• N₂

• All are move at the same speed

2,020 cal of energy is added to 35 grams of water at an initial temperature of 18.4°C. What is the final temperature of the water?

• 76 °C

• 58 °C

• 39.6 °C

• None of these

Tags

NGSS.HS-PS3-1

At 120 K, the particles of a gas have:

• one-fourth the average kinetic energy of the same particles at 20 K.

• twice the average kinetic energy of the same particles at 6 K.

• half the average kinetic energy of the same particles at 240 K

• none of these

Tags

NGSS.HS-PS3-2

Calculate the ΔH for the following reaction:
K_(s) + ½Cl_2(g) + 1½O_2(g) → KClO_3(s)
Given the following information:
KClO_3(s) + 3Mg_(s) → KCl_(s) + 3MgO_(s) ΔH = –1852 kJ mol–1

K_(s) + ½Cl_2(g) → KCl_(s). ΔH = –437 kJ mol–1

Mg_(s) + ½O_2(g) → MgO_(s) ΔH = –602 kJ mol–1
What is the value of ΔH for the reaction above?

• -63.5 kJ

• 63.5 kJ

• -391 kJ

• 391 kJ

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-1