PTE

describing or involving atoms, including their internal structures and interactions

the number of protons in the nucleus of an atom

a wide-mouthed laboratory container, usually cylindrical and equipped with a pouring lip

a gas whose molecules contain one carbon atom and two oxygen atoms, produced by respiration and many combustion processes

a substance that increases a reaction's rate while being regenerated rather than consumed overall

an interaction that holds atoms or ions together in a chemical substance

a representation using element symbols and numbers to show the composition of a substance

a change in which starting substances are transformed into different substances through rearrangement of chemical bonds

a substance made from atoms of two or more different elements chemically combined

the amount of a substance present in a specified quantity of a mixture or solution

able to damage or destroy materials or living tissue through chemical action

to reduce the concentration of a solution by adding more solvent

the process of lowering a solution's concentration by adding solvent

a negatively charged particle that is part of atomic structure and participates in chemical bonding

a chemical type of atom identified by its number of protons, or a pure substance containing only that type

to pass a fluid through a barrier that retains some particles while allowing the fluid through

separation of some particles from a fluid by passing the fluid through a barrier

capable of catching fire and burning readily

a laboratory vessel with a wider body and a narrower neck, used for holding or working with substances

a ventilated laboratory enclosure designed to draw hazardous airborne substances away from the user

a tall, narrow vessel marked with a scale for measuring liquid volume

not dissolving to an appreciable extent in a particular solvent under stated conditions

an atom or group of atoms with a net electrical charge

a gas whose molecules each contain one carbon atom and four hydrogen atoms, occurring in natural gas and produced by some biological processes

describing or involving molecules and their structures, interactions, or behavior

an electrically neutral group of two or more atoms held together by chemical bonds

to react an acid with a base, reducing the acidic or basic effect of the reacting material

a chemical element that does not display the typical combination of metallic properties

a carbon-based compound in the class studied in organic chemistry, usually containing carbon-hydrogen bonds