Calorimetry Concept

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-PS3-4

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

NGSS.HS-PS3-1

Symbol for specific heat capacity

• q

• m

• c

• ΔH

Identify the ΔT for the given problem.

• 25°C

• 175°C

• 150°C

• 200°C

Tags

NGSS.HS-PS3-1

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-PS1-5

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

NGSS.MS-PS3-4

What is calorimetry?

• The process of measuring the amount of heat that is absorbed or released in a chemical reaction

• The process of measuring the amount of time it takes for certain reactions to take place

Tags

NGSS.HS-PS1-4

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