Question | Answer |
Law of Conversation | states thay matter can not be created nor destroyed, it can only change from or be transferred |
physical change | occurs when one or more physical properties of a substance are changed; many physical changes can be undone by physical means. |
chemical change | occurs when two or m ore substances are changed into a new substacne , with different properties cannot be undone by physical means. |
Element | substance that are tge building blocks of all matter: an element is made up of one kind of atom. |
chemical formula | a way of describing the number of atoms that make up one molecule of a compound. |
element molecule | molecule of one type of atom. |
compound molecule | the element in a compound are chemicallly bonded. |
chemical equation | a way of writing changed in the arrangement of atoms durring a chemical reaction, using chemical symbols. |
chemical reaction | change that takes place when tow or more substances (reactants) interact to form new substances. |
Reactants | (in chemical equation) a compound or element that changes during a chemical reaction. |
products | (in chemical equation) compound or element that is the result of a chemical reaction. |
coefficient | in a chemical equation, the number placed in front of a chemical formula to balance the equation. |
subscript | tells the number of atoms in one molecule . |
diatomic | 2 atoms of the same elements bonded together. |
Ionic compound | chemical hand in which one or more electrons from one atom are transferred to another atom. |
covalent compound | a molecule formed by covalent bonds, in which the atoms share one or more pairs of valence electrons. |
metallic compound | A metallic compound is a compound that contains one or more metal elements. |
synthesis | The formation of a chemical compound through the combination of simpler compounds or elements. |
decomposition | A decomposition reaction is a type of chemical reaction where one reactant yields two or more products. |
single replacement | A single displacement reaction is a chemical reaction where one reactant is exchanged for one ion of a second reactant. |
double replacement | A double replacement reaction is a chemical reaction where two reactant ionic compounds exchange ions to form two new product compounds with the same ions. |