Question | Answer |
electron | a negativley charged particle located in the region surrounding the nucleus of an atom |
energy level | a specific region surrounding the nucleus that is available for electrons |
atomic number | the number of protons in the nucleus of an atom |
neutron | a neutral particle located in the nucleus of the atom |
mass number | the total number of protons and neutrons in an atom |
valence electron | an electron that occupies the outermost energy level in an atom |
proton | a positivley charged particle located in the nucleus of an atom |
cation | a postivley charged ion |
atomic mass | the average mass of the atoms of an element including all isotopes |
element | a pure substance which cannot be broken down into simpler substances by chemical means |
anion | a negativley charged ion |
atom | the smallest part of an elemnt that has all the properties of that element |
non metal | an element that is not flexible does not conduct electricity and tends to form negative ions |
ionic bond | a bond formed by the simultaneous attraction between positive and negative ions |
molecular compound | a pure substance formed from non metals |
metal | a malleable and ductile element that has lustre has good heat and electrical conductivity and tends to form positive ions |
molecule | a particle containing a fixed number of covalently bonded non metals |
ionic compound | a pure substance formed from a metal and a non metal |
covalent bond | a bond formed by the simultaneous attraction of two nuclei for a shared pair of electrons |
compound | a pure substance formed from atoms of two or more elements with different atoms joined in fixed ratios |
solute | a substance that dissolves |
exothermic change | a chemical change in which energy usually in the form of heat is released into the surroundings |
non electrolyte | a solute in a solution that does not conduct electricity |
solvent | a substance in a solution that breaks down the bond of a solute |
solution | a homogeneous mixture of dissolved substances that contains a solute and a solvent |
chemical change | a change in which one or more new substances with different prperties are formed |
dissociation | the seperation of an ionic compound into individual ions in a solution |
endothermic change | a chemical change in which energy is absorbed from the surroundings |
aqueous solution | a solution in which water is the solvent |
electrolyte | a solute that forms a solution that conducts electricity |
standard solution | a solution having a precisley known concentration |
mole | a specific amount of a substancethat consists of 6.022 times 10 to the power of 23 |
acid | a substance taht produces hydrogen ions when dissolved in water to form a conducting aqueous solution |
molar concentration | the amount of solute in moles per litre of solution |
molar mass | that mass of one of the mole of a substance |