Calorimetry

1.40 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

Tags

NGSS.HS-PS3-4

Identify the ΔT for the given problem.

• 25°C

• 175°C

• 150°C

• 200°C

Tags

NGSS.HS-PS3-1

NGSS.HS-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

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

How is she going to get the c (specific heat) by itself?

We will use lowercase "c" instead of C_S, what does c stand for?

• Temperature in Celcius

• specific heat capacity

• heat released or absorbed

The negative sign means that energy is released.  Does this mean that it's endothermic or exothermic?

• endothermic

• exothermic

Tags

NGSS.HS-PS1-4

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

Tags

NGSS.HS-PS3-1

NGSS.HS-PS3-4

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

Tags

NGSS.HS-PS3-4