Chemistry Midterm Review (Units 5 - 7)

Under which conditions of temperature and pressure does a real gas behave most like an ideal gas? 

• 137 K and 1 atm
• 347 K and 1 atm
• 37 K and 8 atm
• 347 K and 8 atm

The temperature of a sample of matter is a measure of the

• average potential energy of the particles of the sample
• average kinetic energy of the particles of the sample
• total nuclear energy of the sample
• total thermal energy of the sample

State what happens to the potential energy of the particles of the sample during time interval BC.

• Increases
• Decreases
• Stays the same

Which physical change is endothermic? 

•  CO₂(s) → CO₂(g)
• CO₂(g) → CO₂(ℓ)
• CO₂(ℓ) → CO₂(s)
• CO₂(g) → CO₂(s)

20 g of water. specific heat of water is 4.18 J/x°C.  temperature changes from 25° C to 20° C, how much heat energy (Q) moves from the water to the surroundings?

• 418 Joules
• 209 J
• 83 J
• 4.18 J

For an exothermic reaction, the heat is on the ____ side

• reactant
• product
• either side

How many states of matter are present during line segment AB?

• One
• Two
• Three
• Depends on the temperature

25 degrees Celsius is ___________ K

• -248

• 298

• 125

• -125

At what temperature do nitrogen molecules move fastest?

• 350 K
• 300 K
• 250 K
• 200 K

According to Charles Law, volume and temperature are directly related. This means that

• When volume increases, temperature increases
• When volume increases, temperature decreases
• When volume double, pressure triples
• When volume doubles, volume is reduced by 1/2