Perodic Table
Phases of Matter
Atomic Structure
Physical and Chemical Properties
Compounds
100
What group are noble gas in?
group 18
100
When a solid changes to a liquid its is called what?
Melting
100
The number of electron in one molecule are?
22
100
what is an example of a chemical property of water?
reacts with sodium
100
What is the name of the compound MgSO4?
Magnesium sulfate
200
What is the 1st scientist to create the predictable similar to the one we use today?
Dmitri Mendeleev
200
When solids reach their melting points they become what?
Liquids
200
The nucleus of an element contain 9 protons. Its valence would be?
1
200
What is an example of physical property of hydrogen?
it is less dense than air
200
What is the compound name for PbI2?
Lead(II)idoide
300
Atomic numberWhat is the number of protons in a atom?
Atomic number
300
What is it called when a solid changes directly into a gas?
Sublimation
300
The present atomic weight scale is based on?
C12
300
when a new substance is formed with different properties than the original substance is called?
Chemical change
300
What is the compound name for Fe2O3?
iron(III)oxide
400
How does the atomic size decrease?
left to right
400
When a gas reaches its condersation point it becomes a what?
Liquid
400
Positive ions are formed from the neutral atom by the?
Loss of electrons
400
A physical change occurs when?
the appearance of a substance changes but its identity does not
400
What is the compound name for Cr(OH)3?
chromium(III)hydroxide
500
What groupis the hologen family in?
Group 7
500
True or False? Plasmais a state of matter.
True
500
a neutral atom (Atomic no.>1) consits of?
Neutron+proton+elctron
500
color and shape describes the ? of matter
physical properties
500
What is the compound name for NH4Cl?
ammonium chloride
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