Matter
The study of matter.
What is chemistry?
What scientists think about atoms based on repeated observations of how atoms act in experiments.
What is the atomic theory?
A particle formed when atoms join with other atoms. The atoms that make up molecules from the same element or from different elements.
What is a molecule?
A base that dissolves in water.
What is an alkalis?
The smallest piece of an element.
What is an atom?
A special machine scientists use to smash atoms.
What is a particle accelerator?
A change in which different kinds of atoms form a compound that does not change the structure of the atoms but makes one or more new substances; also called a chemical change.
What is a chemical reaction?
A scale used to determine the concentration of an acid or a base in a solution.
What is a pH scale?
A substance that contains only one kind of atom.
What is an element?
An abbreviation for the name of an element.
What is a chemical symbol?
A type of molecule formed when two or more different elements are chemical bonded together.
A term that describes a solution that is neither basic nor acidic.
What is neutral?
The approximate number of how many protons and neutrons in an atom.
What is atomic mass?
A horizontal row in the periodic table of the elements.
What is a period?
A term that describes atoms that have their outermost shell of electrons completely filled and are not likely to form compounds with other atoms.
What is stable?
A substance that changes color when exposed to acid or base solutions.
What is an indicator?
The number of protons in the nucleus of an atom.
What is an atomic number?
A column in the periodic table of the elements.
What is a group?
An atom that has gained or lost electrons.
What is an ion?
The three main particles in an atom.