Question | Answer |
Physical Change: | affectsonly the physical properties or characteristics...does not change chemical identity |
Chemical Change: | affects chemical structure and composition...identity is changed and properties change |
Chemical reaction: | the process through which a chemical change occurs |
What are the evidences that a chemical reaction occured? | production of gas(bubbles), change in color or odor, formation of a percipitate(a solid that is formed when 2 liquids are mixed), absorbtion/release of heat/light, permanet change in identity. |
How many evidences are there? | 5 |
coefficient? | balance out matter in a reaction |
reactants? | what is used or what is at the start of a chemical reaction |
products? | what is made during/after a chemical reaction |
subscripts? | show the ratio of elements in a compound |
Synthesis Reaction: | When many reactants create 1 procuct |
Decomposition Reaction: | reaction in which 1 reactant makes many productEx.: H2Co3 -> H2O + CO |
double replacement reaction: | reaction where 2 elements (or ions) in 2 different compounds switch placesNaCl + AgF -> NaF + AgCl |
single replacement reaction: | reaction where one element from one compound switches places with one element from another compound.Zn + 2HCl -> ZnCl2 + H2 |
Endothermic reactions: | chemical reactions where energy is absorbed.heat + 6Co2 + 6H2O -> C2H12O6 + 6O2 |
Exothermic reaction: | energy is released2Al + Fe2O3 -> Al2O3 + 2Fe + heat |
reactivity: | how easily an atom reacts with others |
Action activity: | minimum amount of energy needed to start a chemical reaction |
Reaction Rate: | how fast a reaction occurs...can be affected by 2 things:Catalysts and Inhibitors |
Catalysts: | speed up reactions but are not used up in the reaction |
Inhibitors: | slow a reaction down |