Chemical Change Power Point

This my power point of the speech the last monday jeje =) ...................................................

Chemical Change =)

Compound = a chemical combination of two or more elements.

Chemicals bond = a link that atoms or electrically charged particles can form with each other.

Chemical formula = a way of using letters and numbers to show how much of each element is in a substance.

Ion = an electrically charge particle with unequal numbers of protons and electrons.

Molecucle = a Group of bonded atoms that acts like a single particle.

Chemical Property = a way of describing how  a substances change chemically with other substance.

Exothermic =a reaction that gives off heat.

Endothermic= a reaction that absorbs heat.

Elements and Atoms

§         Element: a susbtance that cannot be broken down any further into anything simpler.

 

§         Atom: the smallest particle of an element that has same chemical properties as the elements.

 

§         Nucleus: an atom’s dense center where most of its mass it.

 

§         Electron: a negatively charged particle that moves around an atom’s nucleus.

 

§         Proton: a positively charged particle inside an atom’s nucleus.

 

§         Neutron: a particle with no charge inside an atom’s  nucleus.

 

§         Atomic number: the number of protons in am atom.

 

§         Metal: any of a group of elements that conduct heat and electricity, is shiny and bendable.

Physical Poperties

 Matter: Any solid, liquid, or gas.

 Mass: Amount of matter in an object.

 Volume: The amount of mass in a certain volumen of materials.

 Density: The amount of mass in acertain volume of materials

 Physical Properties: A property that can be observed without changing the identity of a substance.

 Solution: a mixture of one substance dissolved in another so that the properties are the same throughout.

 Chemical change: a change in matter that produces a new substance with different properties from the original.