How Do you make a science Cover for these directions?

Question

Illustrate the principle of mass conservation

Answer 1

Biology has a good example of how this works.

A plant takes in carbon dioxide (CO2) and exhales oxygen.
The plant uses that carbon dioxide to run its life processes.
If the plant is burned that carbon dioxide doesn't go away, it goes up in the smoke creating airborne CO2, which is a greenhouse gas that helps cause global warming. Cars don't just create greenhouse gasses, anytime a forest burns that creates a lot of CO2. In the undeveloped world farmers set fires to clear land for plantings and to recover new land to farm. Forest fires do the same thing.

If a plant dies then it decays, but the CO2 doesn't just go away it gets locked into the dead plant matter. Under millions of years of heavy pressure this dead plant matter is converted into coal or oil. When these products are burned then that CO2 is returned to the air. This is why global warming has become a big problem in the last 50 years. We have less plants to hold CO2 (since we are clearing jungles, and building new buildings, roads and parking lots, which all replace the plants). In addition to that we are pulling up matter that is millions of years old and dumping that CO2 into your atmosphere.

You can draw a plant, then show it absorbing bubbles of CO2. Then when the plant is burned the bubbles of CO2 return to the air in the form of smoke. Then you can have the plants die and get buried. Then draw an oil well and show the oil going to cars and then show the cars burning that oil and bubbles of CO2 are returned to the air in the car exhaust.

The classic example would be with a fire.
Draw a set of scales that are balanced. Put a bell jar in each scale pan and make sure that they are the same size (so the same weight). Then connect the two bell jars with a length of tubing. Put a campfire stack of wood in each jar. Then light one stack of wood. Show the smoke transferring to the other bell jar via the tube, and then show the side without burning wood fall as the smoke takes it out of balance.

The classic formula for Conservation of Mass and Energy is E = MC^2. When you move mass at the speed of light it changes into energy. The amount of that energy is the mass of the object times the speed of light squared.

You could show a stack of food and an animal like a cow, dog or man.
When the animal eats the food the result is waste and a build up of mass and energy. If you were to weigh the waste and the animal then it would be the same weight as that of the food and the animal. This isn’t a 100% correct analogy since part of the food is burned off in energy, but you get the idea.

Finally, you can use two combustible or reactive chemicals. Draw a bell jar on a scale with two jars of chemicals inside. If one is bleach and the other is a chlorine based cleaner (Comet or Ajax) then when you add the two cleaners together their will be a chemical reaction that releases chlorine gas. In a sealed environment the weight would remain the same. As above the example is not 100% correct since some of the reaction is lost in a change of heat, but this is a very minor change since we are not talking about an E=MC^2 reaction, but only a chemical reaction.

Answer 2

Draw a match on fire. Mass converted into energy/light.