3.4 Thermochemistry

How many Joules of energy are required to change 10 gram of ice at -2 C to water at 20 C?

• 440 J
• 880 J
• 10,140 J
• 66,000 J

What is the change in temperature when 50,000 Joules of energy is added to 200 grams of water at 25 C?

• 0.016 C
• 1,500 C
• 63 C
• 0.4 C

How many Joules of energy are required to change 10 gram of water from 20 C to 90 C?

• 1400 J
• 2800 J
• 210,000 J
• 1,400,000 J

How much liquid water can you change 20 C if you apply 20,000 J?

• 500 g
• 100,000 g
• 250 g
• 350 g

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

• 418 J

• 209 J

• 83 J

• 4.18 J

What  is the formula to calculate heat energy required to raise the temperature of any substance?

• Q=mc∆t
• Q=mc
• Q= ½mv
• m=QC

A high specific heat means...

• It heats up quickly with energy added
• It requires more energy to change temperature

The symbol for specific heat is .......

• c
• Q
• m
• t

Which will heat up faster?

• copper

• granite

• iron

• basalt

How many Joules of energy are required to make 50.0 grams of ice at 0 ^οC completely melt?

• 334 J

• 0 J

• 113,000 J

• 16,700 J

• 209 J