Unit 7 Test Review

Which will heat up slower?

• water

• lead

• granite

• iron

The specific heat of platinum is 0.133 J/g°C. How much heat(Q) is absorbed when a 10 g piece of platinum heats up from 50°C to 100^oC?

• 66.5 J

• 665 J

• 0.0266 J

• 0.665 J

How does heat flow?

• Always from cold to warm
• Always from warm to cold
• Both warm to cold & cold to warm
• It depends on the temperature

Graphite has a specific heat of 0.709 J/g⁰C. If a 20 gram piece of graphite is cooled from 38⁰C to 18⁰C, how much energy was lost by the graphite?

• -283.6 J

• -183.6 J

• 203 J
• 109 J

How many Joules of energy are required to make 100 grams of ice at 0 ^οC completely melt?

• 200 J
• 334 J

• 33,400 J
• 2,000,000 J

What is the heat of fusion (Q_f)?

• The amount of heat required to change 1 gram of solid to liquid.

• The amount of heat needed to blend 2 metals.

• The amount of heat needed to twist together 2 objects.

• The amount of heat required to change 1 gram of liquid to gas.

Which substance has the weakest intermolecular forces?

• Substance A, boiling point of 75 °C

• Substance B, boiling point of 105 °C

• Substance C, boiling point of 25 °C

• Substance d, boiling point of 45 °C

According to the reference table, what is the boiling point of ethanoic acid at 80 kPa?

• 28 ^oC

• 100^oC

• 111^oC

• 125^oC

Which liquid has the highest vapor pressure at 75^oC?

• ethanoic acid

• ethanol

• propanone

• water

What is the normal boiling point of water

• 0 K

• 100^oF

• 32^oC

• 100^oC