Atomic Theory
What are the subatomic particles that have a positive charge?
Protons
What are the rows and columns called?
Rows = Periods
Columns = Groups/Families
What are the two kinds of properties we look for with materials?
Physical and Chemical
What is a half-life?
How long it takes for something to decay and lose half of it's material.
Are compounds chemical or physical combinations?
Chemical
What are the two subatomic particles that make up the nucleus?
Protons and Neutrons
Name the first and second families.
Alkali Metals, Alkaline Earth Metals
Does a chemical or physical change produce a new substance?
Chemical
Do organic or inorganic materials experience typical decomposition/decay?
Organic
True or False: You can have mixtures of elements AND compounds.
True
What are the electrons on the OUTER SHELL called?
Valence Electrons
What's wrong with this element:
Carbon = Carbon Family, 6 protons, 6 neutrons, 6 electrons, 3 valence electrons
4 valence electrons
Is gas burning a chemical or physical reaction?
Chemical
After 4 half-lives, what fraction of the material is left?
1/16
Put these in order of complexity: Mixtures, Elements, Compounds
Elements, Compounds, Mixtures
How do you determine the number of valence electrons?
Look at the Group/Family
Draw the Lewis Dot Diagram for Carbon
TBD
Name the 5 types of chemical reactions
Synthesis, Decomposition, Single Replacement, Double Replacement, Combustion
If Au-198 has a half life of 12 years and starts with 134 grams, how much will be left after 36 years?
16.75 grams
What would you call this?
Mixture of two compounds.
How do you know the number of neutrons that an element has?
Atomic Mass - Atomic Number
Draw the Bohr Model for Sulfur
TBD
What is this reaction an example of?
AgNO3 + NaCl → AgCl + NaNO3
Double Replacement
A sample of Ce-137 started at 432 grams. After 120.9 years, how much will remain if its half-life is 30.23 years?
27 grams
Are compounds uniform or not? Are mixtures?
Compounds are always uniform. Mixtures can be uniform or non-uniform.