Day 2 of Thermochemistry

Day 2 of Thermochemistry

I can solve for any variable in the heat equation.

I can state the difference between endothermic and exothermic processes.

I can describe the process of calorimetry.

I can calculate the amount of heat produced or absorbed using stoichiometry in an equation.

Multiple Choice

What unit do you use to measure Thermal Energy?

• J/Kg ºC
• Kg
• ºC
• J

Multiple Choice

What is the symbol for Specific Heat

• Q
• t
• m
• C

Multiple Choice

Water has a specific heat of 4184 J/KgºC.  Wood has a specific heat of 1760 J/KgºC.  What material needs more energy to raise the temperature 1ºC

• Wood
• Water
• Both are the same

Multiple Choice

Copper, Stainless Steel, Carbon Steel, and Zinc were all heated using the same thermal energy.  What material would be the coolest after being heated?

• Copper
• Carbon Steel
• Zinc
• Stainless Steel

Multiple Choice

A material was cooled from 100ºC to 40ºC.  What is the temperature change?

• 60ºC
• 40ºC
• -60ºC
• -40ºC

Multiple Choice

How does heat flow?

• Always from cold to warm
• Always from warm to cold
• Both warm to cold & cold to warm
• It depends on the temperature

Multiple Choice

Which science involves measuring the amount of heat released or absorbed during a chemical reaction?

• stoichiometry

• calorimetry

• photolithography

• metrology

Multiple Choice

What type of chemical reaction absorbs energy and requires energy for the reaction to occur?

• Endothermic

• Exotermic

• Exothermic

• Endotermic

Multiple Choice

What term is given to a reaction which transfers heat energy to the surroundings?

• Endothermic

• Reversible

• Exothermic

• Exotermic

Multiple Choice

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

Multiple Choice

Which letter is used to represent enthalpy in an equation?

• capital Q

• lowercase t

• capital H

• lowercase e

Multiple Choice

Experimental Set-up for Calories in a Chocolate Chip Cookie Students designed an experiment to determine the amount of calories in a chocolate chip cookie. A ring stand was used with a clean aluminum soda can hung from the ring that was partially filled with a known mass of water. A thermometer was placed inside the can so that it measured the temperature of the water but did not touch any part of the metal can. Once set-up was complete, an initial water temperature was taken. The cookie was then lit on fire and allowed to completely burn. A final temperature of the water was measured.

Refer to the experimental set-up for calories in a chocolate chip cookie. How does this experiment allow students to measure the calories in a cookie?

• The difference in masses before and after the cookie is burned is calculated, then converted into heat energy.

• Heat energy from the burning cookie is transferred to the water. The change in water temperature is used to calculate the heat energy from the cookie.

• Data from the amount of time for the cookie to burn and the temperature change are used to calculate the heat energy from the cookie.

• The cookie is burned until the water reaches a boiling temperature, then masses are compared to calculate the heat energy from the cookie.