Unit 5.2

What is true regarding CO₂ for temperatures above 31 °C?

• It can never be liquified.

• It decomposes.

• It has a high pressure.

• It is a plasma.

At 10 atm, dry ice is heated from -100 °C to 30 °C. What changes occur?

• freezing, then condensation

• melting only

• sublimation only

• melting, then boiling

What state of matter is X?

• solid 
• liquid
• gas
• supercritical fluid

What change occurs from F to E?

• sublimation
• deposition
• melting
• condensation

What is the PE of the reactants?

• 40 kJ
• 20 kJ
• 100 kJ
• 60 kJ

What is the PE of the products?

• 40 kJ
• 20 kJ
• 100 kJ
• 60 kJ

Is the reaction endothermic or exothermic?

• Endothermic
• Exothermic
• Caroussothermic
• Nonthermic

Which number represents the change of the heat of the reaction (ΔH)?

• 1
• 2
• 3
• 4

What is the heat of the reactions (ΔH)?

• 250 kJ
• 75 kJ
• 225 kJ
• 150 kJ

In which segment is the kinetic energy remaining constant?

• A-B

• B-C

• C-D

• E-F