Chemistry Flashcards
(11 cards)
What is an atom?
The smallest particle of an element that still has it’s properties
What is an element?
A substance made of only one type of atom
What is a compound?
A substance made from 2 or more elements chemically joined
What is a mixture?
2 or more substances mixed, but not chemically joined
What are the 3 states of matter?
Solid, liquid, gas
What happens during melting?
Solid turns into a liquid when heated
What is a chemical formula?
A way to show which atoms are in a compound, e.g. H2O for water
Signs of a chemical reaction?
Colour change, temperature change, gas produced
What is a chemical reaction?
A change where new substances are made
What is a physical change?
A change in state or appearance
What is the periodic table?
A chart that shows all known elements
