matter
What state of matter has a definite volume but takes the shape of its container.
liquid
What type of energy is stored in an object because of its position or structure?
potential energy
Which negatively charged subatomic particle orbits the nucleus of an atom?
electron
What are the rows on the periodic table called?
periods
What are the starting substances in a chemical reaction that change into new substances?
The reactants
What is the law that states that matter cannot be created or destroyed in a closed system.
The Law of Conservation
What is the energy of an object in motion?
Kinetic energy
Which two subatomic particles are located inside the nucleus of an atom?
protons and neutrons
What are the columns on the periodic table called?
What type of chemical reaction releases energy, usually in the form of heat or light?
exothermic reaction
What is the temperature where a liquid completely changes into a gas.
The boiling point
What type of potential energy is stored in the bonds of chemical compounds like food or fuel?
chemical energy
What do you call atoms of the same element that have the same number of protons but different numbers of neutrons?
isotopes
Which highly reactive group of elements occupies Group 1 on the far left of the periodic table?
Akali Metals
Which type of reaction occurs when two or more simple substances combine to form a single, more complex product?
synthesis
What is the phase change that occurs when a solid turns directly into a gas without becoming a liquid first?
sublimation
Which law states that energy can change form but cannot be created or destroyed?
The Law of Conservation of Energy.
What is the total number of protons and neutrons found inside an atom's nucleus?
mass number
Which large group of metallic elements occupies the center of the periodic table from Groups 3 to 12?
transition metals
What is the minimum amount of energy required to start a chemical reaction?
activation energy
What state of matter has ionized gas particles found in stars and lightning?
plasma
What form of energy is produced by the sun?
light energy
Which specific electrons occupy the outermost shell of an atom and determine its chemical bonding behavior?
What separates the metallic elements from the nonmetals from the periodic table?
The staircase
What substance speeds up a chemical reaction without being consumed in the process?
Catalyst