Atoms
A dense region in the centre of an atom, containing protons and neutrons.
What is the nucleus?
An element with the chemical symbol Na
What is sodium?
Vertical columns in the Periodic Table
What is a group?
Two or more atoms of the same element bonded together.
What is a molecule?
Reactants -> products
What is the structure of a chemical equation?
Tiny, negatively charged particles
What are electrons?
The lightest and most common element
What is hydrogen?
Horizontal rows in the periodic table
Two or more atoms of different elements, chemically bonded.
What is a compound?
Change in colour, temperature, appearance, or production of gas.
What are some signs of a chemical reaction?
The regions where electrons orbit around the nucleus
What are electron shells?
The number of naturally occurring elements.
What is 92?
Number of Protons PLUS neutrons
What is the atomic mass?
Two or more elements that can be separated by physical means.
What is a mixture?
A complex molecule breaks down to make simpler ones
What is a decomposition reaction?
A substance containing only one type of atom.
What is an element?
Element with the chemical symbol N.
What is nitrogen?
What are metals?
Water, carbon dioxide, and sodium chloride.
What are some examples of compounds?
A reaction involving heat/burning and oxygen.
What is combustion?
Electrons in the outermost shell are called this.
What are valence electrons?
Element number 20
What is calcium
The elements found on the far right of the periodic table.
What are the noble gases?
Milo in milk, tea, and coffee.
What are some examples of mixtures?
Matter cannot be created or destroyed, only rearranged.
What is the Law of Conservation of Mass?