Atoms, molecules and chemical equations Flashcards
Define atom
The smallest part of an element that can exist
Define element
A substance made of only one type of atom
What is a group on the periodic table?
vertical column of elements with similar chemical properties
What is the ‘staircase’ line separating the right side of the periodic table?
The right side is non-metals and the left side is metals
What are metalloids?
-B, Si, Ge, As, Sb, Te, At
-elements that have some properties like metals and some like nonmetals
-Next to the line that separates metals and non-metals
Define molecule
A group of 2 or more atoms bonded together
Define compound
A substance made of two or more different atoms chemically bonded together
What are the 3 components of an atom?
proton, neutron, electron
How is an atom arranged?
protons and neutrons in the nucleus, electrons in the outer shells
What are the charges of protons, neutrons, and electrons?
-Proton: positive
-Neutron: neutral (no charge)
-Electron: negative
What is a chemical equation?
symbolic representation of a chemical reaction
What are reactants?
the starting materials in a chemical reaction
What are products?
The elements or compounds produced by a chemical reaction.
What is a word equation?
an equation in which the reactants and products in a chemical reaction are represented by words
What is a symbol equation?
A chemical equation in which the chemicals are represented by formulae
