Types of Reactions

 Synthesis; A+B=AB
element and an Element combine to form another substances
Element + Element=Compound

 Decomposition; AB=A+B
on substance breaks down into two or more simpler substances.
Compound=Element+Element

 Single-Displacement; A+BY=AY+B
Occurs when one element replaces another element in a compound
Element+Compound=Compound

 Double-Displacement= AY+BX=BX+BY
Two diffrent atoms in two diffrent compounds exchange places
Compound+Compound=Compound

 Combustion= The products of combustion are always water and carbon dioxide
Hydrocarbon+Oxygen= Water+Carbon Dioxide

Single-Displacement reacts to Zinc it creats bubbles and loud bombing sounds

Where do elements come from

Brianna
Pentucket High School
October 7, 2013



Where do elements come from?

Where did all the elements of the universe come from?
* Hydrogen, oxygen, and Helium
* They come from stars that explode. Combinations of the stars gasses created elements.

How did the universe form?

* Around all young suns, young stars, all combine, swirl around, the energy of the stars stirs them around, they first form particles, then that forms snowflakes, that formed little dust pieces which then forms rocks, which forms asteroids then eventually the asteroids turned into planets and moons.

How do I know/understand matter and what I know/understand about matter?

* Because earth is made from lava rock, magma and lots of elements such as hydrogen, oxygen, and H2O. Matter occupies space it’s a combination of mass and an object that takes up space.