HW - Calorimetry

If two objects have different temperatures when they come in contact, heat will flow from the warmer object to the cooler one UNTIL ____________

• one reaches a temperature of zero

• they both have an equal temperature

• one runs out of energy

Tags

NGSS.HS-PS3-4

The total energy of all the particles in a substance is called: 

• temperature
• thermal energy
• degrees
• mass

Tags

NGSS.HS-PS3-2

NGSS.HS-PS3-4

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? (C_ice=2.11J/g°C, C_water=4.18J/g°C, C_steam=2.00J/g°C, H_fus=334J/g, H_vap=2260J/g)

• 0.111 J/g°C

• 1.29 J/g°C

• 0.129 J/g°C

• 22225.85 J

How much heat is required to increase the temperature of 1.2 kg of water from 23 °C to 39 °C? (C_ice=2.11J/g°C, C_water=4.18J/g°C, C_steam=2.00J/g°C, H_fus=334J/g, H_vap=2260J/g)

• -80,256 J

• 80.256 J

• 80,256 J

• -80.256 J

A sample of iron receives 50.J of heat energy that raises the temperature of the iron by 25.0°C. If iron has a specific heat of 0.10 J/g°C, what is the mass of the iron sample?

• 25g

• 30g

• 20g

• 50g

A reaction is performed in a beaker with a temperature probe recording the temperature changes of the reaction.  If the temperature began at 15.0 degrees Celsius and ended at 27.5 degrees Celsius. Is the reaction endothermic or exothermic?

• Exothermic
• Endothermic

Tags

NGSS.HS-PS1-4

A piece of metal with a mass of 32.8 g is heated to 100.5°C and dropped into 138.2 g of water at 20.0°C. The final temperature of the system is 30.2°C. What is the specific heat capacity of the metal? (C_ice=2.11J/g°C, C_water=4.18J/g°C, C_steam=2.00J/g°C, H_fus=334J/g, H_vap=2260J/g)

• 2.56 J/g°C

• 0.391 J/g°C

• 5.29 J/g°C

• 3.50 J/g°C

A metal cube at temperature of 10°C immersed in a liquid at temperature of 70°C.

What is the temperature of the metal cube when thermal equilibrium is achieved between the cube and the liquid?

• Between 10°C and 70°C

• More than 70°C

• Less than 10°C

• Same as the room temperature

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? (C_ice=2.11J/g°C, C_water=4.18J/g°C, C_steam=2.00J/g°C, H_fus=334J/g, H_vap=2260J/g)

• 37.8 °C

• -19.8 °C

• 19.8 °C

• 55.8 °C

Steam at temperature of 100°C is piped to 3 kg of water at the temperature of 5°C until the water reaches the boiling point. What is the mass of steam required?

(C_ice=2.11J/g°C, C_water=4.18J/g°C, C_steam=2.00J/g°C, H_fus=334J/g, H_vap=2260J/g)

• 0.26 kg

• 0.53 kg

• 0.94 kg

• 1.89 kg