Vocabulary 3: Chemical Changes

1 Compound: A chemical combination of two or more elements.  



2 Chemical Bond: a link that atoms or electrically charged particles can form with each other. 



3 Chemical Formula: a way of using letters and numbers to show how much of each element is in a substance.  



 4 Ion: an electrically charged particle with unequal numbers of protons and electrons.  



5 Molecule: a group of bonded atoms that acts like a single.  



6 Chemical Property: a way of describing how a substance changes chemically with other substances.

  
7 Exothermic: a reaction that gives off heat.



8 Endothermic: a reaction that absorbs heat.

Vocabulary # 2

1 element: a substance that connot be broken down any further into anything simpler



2 atom: the smallest psrticle of an element that has the same chemical propertoies as the element



3 nucleus: an atom's  dense center, ahere most of its mass is



4 electron: a negatively charged particle that moves around an atom's nucleus



5 proton: a positively charged particle inside an atom's nucleus



6 neutron: a particle with no charge inside an atom's nucleus



7 atomic number: the number of  protons in an atom



8 metal: any of a group of elements that conduct heat and electricity, is shiny and bendable

Vocabulary # 1

1 Matter: any solid, liquid,or gas.



2 Mass: amount of matter in an object.



3 Volume: the amount of space an object takes up.



4 Density: the amount of mass in a certain volume of material.



5 Physical Property: A property that can be observed without changing the identify of a substance. 



6 Physical Change: a change in size,shape,or state without forming a new substance



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



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