5.2 Trends in the Periodic Table Flashcards
Define chemical property
a property that is seen when a substance takes part in a chemical change
Define physical property
the property that can be observed or measured without changing the basic nature of the substance.
Give 2 examples of chemical properties
Reactivity
Flammability
Define reactivity
How likely a substance will undergo a chemical reaction
Give an example of a element that is flammable
Hydrogen
Give examples of elements that are not flammable
Gold
Nitrogen
What does chemical properties of an element depend upon?
It depends on the number of electrons in their outer shell. Elements with the same number will have similar chemical properties.
Give a few examples of physical properties
Melting point
Boiling point
Hardness
Colour
What are the elements in Group 1 called?
alkali metals
What are alkali metals
These elements are reactive metals. They all react with water to produce hydrogen and an alkaline solution.
What is the word equation for the reaction of sodium with water
sodium + water –> sodium hydroxide + hydrogen
