Calorimetry Review

What is the answer to this problem?

• 42 g

• 0.04 kg

• 0.02 g

• 24 g

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

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 Celsius

• they both have an equal temperature

• they have the same potential energy

• one reaches its phase change temperature

Tags

NGSS.HS-PS3-4

What is the specific heat of an unknown metal if 100.0 g of it at 200.0 °C reaches an equilibrium temperature of 27.10 °C when it is placed in a calorimeter of water. The water weighs 75.0 g and had an initial temperature of 20.00 °C?

• 0.112 J/g°C

• 0.129 J/g°C

• 1.29 J/g°C

• 0.0737 J/g°C

Tags

NGSS.HS-PS3-1

NGSS.HS-PS3-4

40 L of water was heated from 15.8^oC to 85.0^oC by burning 10.0 g of parafin (C₂₅H₅₂). What is the molar enthalpy of combustion of parafin?

• 14.3 kJ/mol

• 14.3 J/mol

• 2.09 kJ/mol

• 11.5 kJ/mol

Tags

NGSS.HS-PS1-4

Symbol for specific heat capacity

• q

• m

• c

• ΔH

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

Calorimeters use insulating materials like Styrofoam to

• encourage affordable materials in science experiments in schools.

• preserve the heat of the environment outside the Styrofoam cup.

• keep the liquid inside the Styrofoam cup from overheating.

• prevent energy from leaving or entering from the external environment.

Tags

NGSS.MS-PS3-3

A chemical is burned in a bomb calorimeter that contains 3.5 liters of water. If the combustion of this compound causes the temperature of the water to rise 47 °C, how much energy was put into the system?

• 12,406.8 Joules

• 688,268 Joules

• 1,338,880 Joules

• 445,580 Joules

Tags

NGSS.HS-PS3-1

A 65 gram metal is heated to 300°C and then dropped into a calorimeter that contains 103 mL of water at 25°C. If the final temperature is 40°C, what would be the identity of the metal (use chart)?

• Iron

• Copper

• Lead

• Silver

Tags

NGSS.HS-PS3-1

NGSS.HS-PS3-4

135 g of aluminum (initially at 300C) is mixed with an unknown mass of water (initially at 25C). When thermal equilibrium is reached, the system has a temperature of 80C. Find the mass of the water. (Specific Heat of Al= 0.90 J/g·C)

• 111.65 grams

• 36.69 grams

• 116.95 grams

• 45.23 grams

Tags

NGSS.HS-PS3-1

NGSS.HS-PS3-4