Vocab
Heat always flows from a ______________ object to a _____________ object.
Warmer, colder
What type of reaction absorbs heat?
Endothermic Reactions
What is the equation for heat?
Q=mΔTCp
How much heat energy is exchanged when a 250 g piece of Iron is heated from 25 °C to 60 °C?
Remember to include units!!!
3937.5 J
What is the name of the holiday that is on the longest day of the year?
What does the prefix "thermo" mean?
Heat
The temperature of the beaker increases after a reaction. What type of reaction is this?
Exothermic Reaction
What is the variable and unit for mass?
Variable:
Unit:
Variable: m
Unit: grams (g)
Remember to include units!!
-66880 J
Weighing in at around eight pounds, what is the human body's largest organ?
the skin
In order for heat to flow, the two objects must be...
(give two answers for 2x the points)
1. Touching
2. Different temperatures
In a reaction, energy is either given or taken from the _____________________.
Surroundings (YOU!)
What is the variable and unit for thermal energy (heat)?
Variable:
Unit:
Variable: Q
Unit: Joules (J)
How much will the temperature rise if a 125 g sample of Gold is heated by 3600 J of energy?
223.26 oC
What is the only U.S. state that has a one-syllable name?
Maine
What is an example of the system and the surroundings in the following example:
"Vinegar and baking soda react together in a beaker."
System: The vinegar and baking soda reacting
Surrounding: ANYTHING ELSE!
In a reaction, energy is being released. What happened to the temperature of the surroundings and what type of reaction is this?
temperature increased and this is a exothermic reaction
What is the variable and unit for change in temperature?
Variable:
Unit:
Variable: Δ T
Unit: oC
An unknown metal is 200 g and heated from 10 oC to 90 oC using 6080 J of heat. What metal is this, and what is the specific heat?
Remember to include units!!
Metal: Brass
Specific Heat: 0.38 J/goC
What do you call a group of flamingos?
a flamboyance
What is the law of conservation of energy?
Energy cannot be created or destroyed.
When snow skiing, would you want an exothermic or an endothermic reaction in your hand warmer?
Exothermic
What is the variable and unit for specific heat?
Variable:
Unit:
Variable: Cp
Unit: J/goC
A piece of each substance below is cut to have the same mass and is heated with the same amount of energy. Which substance below will reach the highest temperature? Which will be the lowest temp?
a. Air
b. Iron
c. Ice
d. Water
Highest: B. Iron (has the lowest Cp)
Lowest: D. Water (has the highest Cp)
For an extra 200 points, how many Grammy Awards does this person have?
Beyonce
35 Grammy Awards