Science HW part uno

Objective 1

1) The mass of the matter stays the same anywhere, but the weight of the matter could change depending on where it is.
2) 619.65 cm cubed
3) g/cm cubed
4) D= mass/volume
5) length x width x height

Objective 2

1) A physical change changes the state that the substance is in. It does not create a new a new substance. A chemical change can create a new substance and does happen on a molecular level.
2) Four ways that you can tell tell that a chemical reaction has taken place is it has changed colors or scent, its presence has changed, or its temperature has changed. 
3) The law of conservation of mass was created by a French Chemist named Antoine Lavoisier in 1789. The law states that mass can and is not created/destroyed during a chemical reaction. Basically when a chemical reaction occurs, the starting and ending mass are the same amounts. 
4) Temperature and Thermal energy are different because temperature is the measure of thermal energy in a substance.
5) An example of an endothermic reaction is ice cubes melting. An example of an exothermic reaction is condensation of rain water from water vapor or a cloud. 

Objective 3

1) Thermal energy, kinetic energy, electric energy, electromagnetic energy, potential energy and chemical energy. 
2) Kinetic energy
3) Potential energy
4) Electromagnetic energy is the energy of radiation.
5) It is chemical energy, and an example of chemical energy is plant photosynthesis. 


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