Hesi A2 Chemistry Exam Guide 2024 Graded A

Mixture with uniform density throughout and no distinguishable coponents. - Homogeneous Mixture Mixture in which the components are readily distinguished. - Heterogeneous Mixture A change in which the checmical composition of a substance remains the same. - Physical Change A change in which the chemical bonds are broken and reformed to create a new and different substance. - Chemical Change The simplest of substances and is represented by a specific letter or combinations of letters. - Element Combinations of eleements in whole number ratios. - Compounds Mass cannot be created or destroyed during a chemical reaction. - Law of Conservation of Mass The breaking of bonds and the reforming of new bonds to create new chemical compounds with different chemical forumulas and different chemical properties. - Chemical Reaction syntehesis, decomposition, combusion, single replacement, double replacement - Five main types of chemical reactions. Two elements combine to form a product. - Syntehsis Reaction The breaking of a compound into component parts. - Decomposition Reaction The reaction of a compound or element with oxygen. In the combusiton of a hydrocarbon carbon dioxide and water are produced. - Combustion Reaction Reaction involoving ionic compounds. The reactivity of the ionic compounds determines whether the reaction will take place or not. Can be single replacement or double replacement reaction. - Replacement Reactions Reaction between a more active metal reacting with an ionic compound containing a less active metal to produce a new compound ex. copper wire reacting with aqueous silver nitrate. - Single Replacement Reaction