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The Conservation of Mass and Energy Lab
Transcript of The Conservation of Mass and Energy Lab
Data and Observations
The Conservation of Mass and Energy
Law of Conservation of Energy
The Fire Bug scenario showed that energy is transferred from one state to another. The wood burns as chemical energy and the fire gives of energy as heat or thermal energy, and gives off energy as light or radiant energy. This supports the Law of Conservation of Energy.
In the Salty Soup scenario, the electrical energy used by the heating plate created thermal energy to warm the soup. And that heat escaped as the water evaporated. But NO energy was lost.
Law of Conservation of Mass
In the Ice Tea Debate the tea is changed from a liquid to a solid. This shows that the matter (tea) is conserved, and the state of the tea is changed but no matter is lost.
In the Salty soup lab, the water in the soup evaporates and is transformed into vapor.
In the Fire Bug scenario, the wood is being burnt, this is a chemical change in the state of the wood, and this does cause change in the identity of the wood, but matter is not being destroyed, it is being transformed into ash, dust, and being released as gas.
PROBLEM: How can matter and energy be described in a variety of systems?
To demonstrate the differences between physical and chemical changes while observing the laws of conservation of matter and energy.
INTRODUCTION: You will be exploring three scenarios and conducting observations on the physical and chemical changes in matter. You will also investigate the input and output of energy during physical and chemical changes.
PROCEDURES: Note: Read all the instructions for this lab before you begin working!
Pre-reading the procedures will give you a mental picture of what you will be doing and a better understanding of the process.
Three demonstrations will be presented. You must observe and analyze these as part of the lab. The titles of the demonstrations are as follows:
◦“The Iced Tea Debate”
◦“The Salty Soup”
◦“The Fire Bug”
Use the DATA chart provided for recording observations based on the three demonstrations you will watch.
Watch each part of the experimental demonstration and make predictions about what will happen in each scenario. Record your predictions and observations in the DATA AND OBSERVATIONS section of your laboratory report form.
What do you think
What did you see
happening in each
(circle or highlight
that describe the
I predict that the
tea will get colder
and freeze after being
put into the
freezer, at 0
I predict that the
soup was more
some of the
water in the soup
being on the heat,
and the salt was
still in the pot. So
less soup, same
amount of salt
equals salty soup.
Hypothesis 1- The heat from the fire warms the front of the people, but not the back because their backs are facing away from the fire.
Hypothesis 2- The bugs are biting the kid near the fire because the bugs are attracted to the heat given off by the fire.
-After being put into the freezer, when the tea got to 0 degrees Celsius, it froze solid and was not drinkable.
-The soup tasted good at first, when it was left on the hot plate,it tasted salty and was no longer good. Some of the water from the soup evaporated.
-The bugs were only flying around the fire, at certain distances, there were no bugs. And the heat waves only extended to a certain distance. The bugs were atracted to the heat given off by the fire.
-There was a physical change( the ice turning from a liquid to a solid, but no chemical change occurred.
-The soup was more salty then before because some of the water from the soup evaporated making the soup taste very salty. 500 mL of water from the soup was missing. So after adding 500 mL back, the soup tasted good again.
-The energy (heat) given off my the fire only reached a certain distance, and the bugs were attracted to the heat
The Iced Tea Debate The Salty Soup The Fire Bug
Law of Conservation of Matter or Mass:
The law of conservation of matter or mass states that in any chemical transformation, matter is conserved (i.e. it is neither created or destroyed). This means that although substances change into other substances in a chemical reaction, the actual number of atoms remains the same.
Cooking a meal and then eating it.
* If I were to observe someone hotdogs over a fire, and eating, I would be observing many energy transfers.
The fire would be created with mechanical energy and chemical energy (lighting a match) (burning wood) and then the fire would give off thermal energy, or heat, this cooks the hotdogs. At the same time, the fire would be giving off radiant energy (light). When the food is cooked, and someone eats it, they use mechanical energy to chew the food.
This is a scenario where the Law of Conservation of Energy can clearly be observed.
The Conservation of Mass and Energy