C One Flashcards
What is an element?
Single type of atom
What is an atom?
A very small particle
What is a compound?
2 or more elements chemically bonded together
What is the mass of electrons?
1/2000
How to find number of protons and electrons?
Mass number
How to find number of neutrons?
mass number - atomic number
What is the formula for amonia?
NH3
What is the formula for hydrochloric acid?
HCl
What is the formula for sulfuric acid?
H2SO4
What is pure?
Elements
What are compounds?
2 or more elements chemically bonded together
What is a mixture?
2 or more elements or compounds not chemically bonded together
How to separate mixtures?
Distillation
evaporation
filtration
fractional distillation
What is the plum pudding model?
pudding +
electrons dotted throughout -
How was the plum pudding model developed?
Alpha gun shot rays at sheet of gold some went straight through others refracted proving electrons
Who discovered the nucleus?
Rutherford
who discovered neutrons?
chadwick
who discovered current model?
Bohr
What do groups tell?
Number of electrons in outer shell
What do periods show?
number of shells
Why is the overall charge of an atom 0?
+ and - cancel each other out
What is an ions overall charge?
+/-
What do metals loose becoming….
electrons becoming positive
What do none metals lose becoming….
gain electrons becoming negative
How did Newlands arrange the periodic table?
(octaves) mass into pattens
How did Mendeleev arrange the periodic table?
By mass
left spaces
predicted properties - correct
What are the nobel gasses properties?
Full outer shell
un-reactive
used in neon lights
What are the halogens (group 7 properties)?
non metal more reactive at top share electrons in pairs very reactive only want to gain 1 high boiling point at bottom gain electrons (reduction) react violently with group one
What are the alkali metals properties?
React with water easy to cut kept in oil more reactive as you go down group hight boiling points at top lose 1 electron
What is energy in?
melting & evapourating
what is energy out?
condensing and freezing
What are the properties of a soild?
not flowing
can’t be compressed
thick structure
in fixed position
What are the properties of a liquid?
Some movement
not in fixed position
can’t be compressed
What are the properties of a gas?
lots of movement
flow
can be compressed
