When an epidemic spreads around the world it is called a __________.
pandemic
List 3 communicable diseases spread by animals.
Rabies, dengue and malaria.
Substances below a 7 on the PH scale are called ________.
acids
A disease that has many more cases than normal is called an ________.
epidemic
Elements are substances made up from _______ type of atom.
one
Which vitamin deficiency disease did sailors used to get?
Scurvy
What is the chemical symbol for Hydrogen?
H
_________ are the tiny particles that make up everything.
Atoms
___________ are substances made from two or more elements.
Compounds
A substance that is higher than a 7 on the Ph scale is called a ________.
base/alkali
Strong bases are ________.
Caustic
What do we call it when one two elements or molecules break their chemical bonds and make new ones?
A chemical reaction.
We get rickets from a lack of vitamin _____.
rickets
What is the chemical symbol for water?
H2O
Non-metals are not magnetic.
True
Name a strong acid.
What is a compound made from a metal and a non-metal called?
An alloy.
Name a weak acid.
Metals are bad conductors.
False
________ are particles that are made from two or more types of atom, chemically bonded together.
Molecules