Science-chemistry Flashcards
(25 cards)
What is a atom
the smallest part of an element that can exist
Each type of ____ has different ________
atom,properties
What is an element
an element can’t be broken into other substances.They are made up of one type of atom.
Where are all elements found
in the periodic table
What is a compound
made from two or more different elements that have been chemically joined
What is a molecule
a group of two or more atoms chemically bonded together
Meaning of chemical formulae
This tells you how many of each atom there are in a molecule
Eg of chemical formulae
H20
How many elements in the periodic table
118 elements in total
What is a chemical symbol
A letter code for an element
What is the periodic table?
a table of all 118 elements
What is the state from liquid to gas?
boiling
What is a boiling point?
Temp at which a substance boils
What is the state from gas to liquid
condensation
Substances diffuse _______ in gases
quickly
Substances diffuse _______ in liquids
Slowly
True of false:solids diffuse quickly
false:doesn’t happen in solids
What is gas pressure?
the force area caused by particles colliding with the walls
The _____ the temp the more ______ is transferred to the particles
higher,energy
What is condensation?
-water particles in air hit a cold surface
-change of state from gas to liquid
Change of state from solid to gas
Sublimation
Why do substances diffuse
particles diffuse because they are moving randomly in all directions
Describe particles in solids
touching their neighbours
Describe particles in liquids
close together
