Matter
The change of state when a solid becomes a liquid as heat is added
What is melting?
The tiny particle that makes up all matter and has a nucleus with electrons around it
What is an atom?
This chart organises elements by their atomic number and shows repeating patterns in their properties
What is the periodic table?
The energy an object has because it is moving
What is kinetic energy?
When a liquid turns into a gas at temperatures below boiling, often from a surface
What is evaporation?
A pure substance made of only one kind of atom, shown on the periodic table
What is an element?
These are the horizontal rows on the periodic table that show elements with the same number of electron shells.
What are periods?
The stored energy in a stretched spring
What is elastic potential energy?
Particles are tightly packed in a fixed shape, move very little, and do not take the shape of their container
What are solids?
A substance formed when two or more different elements join together chemically
What is a compound?
These vertical columns contain elements with similar chemical properties and the same number of outer electrons
What are groups?
Energy transferred by heating from a hotter object to a cooler one
What is thermal energy (heat)?
The change of state when a gas becomes a liquid as it cools
What is condensation?
These two parts of an atom are found in the nucleus and determine the atom's mass and identity
What are protons and neutrons?
This person created the periodic table that we use today.
Dmitri Mendeleev
This type of energy is released from the nucleus of an atom and can come from fission or fusion
What is nuclear energy?
This law says the total mass of substances before a chemical reaction equals the total mass after the reaction
What is the conservation of mass
This shows the types and numbers of atoms in a compound using element symbols and numbers
What is a chemical formula?
Elements that are shiny, good conductors of heat and electricity, and usually lose electrons in reactions
What are metals?
When energy moves from one place or object to another, for example by conduction, convection, or radiation
What is energy transfer?