IMF, Gases, Solutions review (Math Practice)

What is the specific heat of an unknown substance if 100.0 g of it at 200.0 °C reaches an equilibrium temperature of 27.1 °C when it comes in contact with a calorimeter of water. The water weighs 75. g and had an initial temperature of 20.00 °C? (Specific heat of water is 4.18 J/g°C)

• 0.111 J/g°C

• 1.29 J/g°C

• 0.129 J/g°C

• 22225.85 J

If the specific heat of water is 4.18 J/g∙°C, how much heat is required to increase the temperature of 1.2 kg of water from 23 °C to 39 °C?

• -80,256 J

• 80.256 J

• 80,256 J

• -80.256 J

The specific heat of water is 4.18 J/g°C.

If 980. J of energy is added to 6.20 g of water at 18.0 °C, what is the final temperature of the water?

• 37.8 °C

• -19.8 °C

• 19.8 °C

• 55.8 °C

Calculate the energy needed to completely boil away 30 g of water at 100 ⁰C .

• 67,800 J

• 2260 J

• 226,000 J

• 100 J

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

• 200 J

• 400 J

• 33,400 J

• 2,000,000 J

How much energy is required to heat up 12000 g of copper from 10 °C to 120 °C. The specific heat capacity is 0.390 J/g°C.

• 46800 J

• 561600 J

• 514800 J

You have 20 g of water with specific heat of 4.18 J/g°C. The 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

• 418 J

If 200 grams of water is to be heated from 24.0° C to  100.0° C to make a cup of tea, what is the mass and what is the change in temperature?

• m=100g,  ∆t= 224 C
• m=200g,  ∆t=124 C
• m=100g,  ∆t=24 C
• m=200g,  ∆t=76 C

When Temperature of a gas increases, the Volume will ____________________

• Increase

• Decrease

• Stay the Same

When Volume of a gas increases, the Pressure will ______________

• Increase

• Decrease

• Stay the Same