Question | Answer |
Law of Conservation of Mass | Matter cannot be created or destroyed. |
Physical Change | Physical change rearranges molecules but doesn't affect their internal structures. |
Chemical Change | Chemical change is any change that results in the formation of new chemical substances. |
Element | A chemical element is a substance that cannot be broken down by chemical means. |
Chemical Formula | A combination of symbols used to express the chemical composition of a substance. |
Element Molecule | A molecule made up of two or more atoms of the same element. |
Compound Molecule | A molecule made up of two or more atoms of different elements. |
Chemical Reaction | A reaction that happens when two or more molecules interact and the molecules change. |
Reactants | The elements and molecules that go into a chemical equation. |
Products | The result of a chemical equation. |
Coefficient | The number in front of the chemical formula. It represents the number of molecules. |
Subscript | A subscript is a number written to the right of a chemical symbol and slightly below it. It tells how many atoms of that element are in the compound. |
Ionic Compound | Ionic compounds are compounds where two or more ions are held next to each other by electrical attraction. |
Convalent Compound | A covalent compound is a compound in which the atoms that are bonded share electrons rather than transfer electrons from one to the other. |
Metallic Compound | A metallic compound is a compound that contains one or more metal elements. |
Synthesis | The formation of a compound from simpler compounds or elements. |
Decomposition | Disintegration of a nucleus that occurs spontaneously or as a result of electron capture. |
Single Replacement | Single replacement is when one element replaces another element in a compound. |
Double Replacement | During double replacement, the cations and anions of two different compounds switch places. |