Transcript Unit EQ: What is the difference btwn Physical and Chemical

Warm up 2/18/13
Draw a picture of what an atom looks like.
 Label as many parts as you can.
 Give example of types of atom?
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Atom
Atom
Unit EQ:How is periodic table arranged?
Subatomic particles?
Warm-up 10/1/13
 How many protons, neutrons and electrons
does Thorium-232 and Thorium-236 have?
Unit EQ: How is Periodic Table arranged?
Warm-up
 What does the word periodic/period mean
to you?
repeating in a predictable pattern
Open book to p158
 Get 3 colored pencils out of drawer
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Unit EQ: How is Periodic Table arranged?
Three main classes of elements
Metal
metalloids
Then within those 3
18 groups (columns)
7 periods (rows)
non-metals
Calculating subatomic particles
Atomic number (Z)= # protons = # electrons
 Atomic Mass (A)– weighted average atomic mass equal to # of protons plus # of
neutrons in nucleus
 Mass number = protons + neutrons for
specific isotope
 Isotope – atom of same element with
different # of neutrons and therefore
different mass numbers.
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Unit EQ: How is Periodic Table arranged?
Mendeleev – 1869 (russian) arranged
elements according to atomic mass. 1st
periodic table
He left blanks in table –predicted presence
of unknown elements – Awesome!
Lothar Meyer – a little late
Moseley – 1913 (british) made slight change
and arranged by atomic number. Modern
periodic table
Ticket out the Door 10/8
1)How many protons does Yttrium-90 have?
2) How many electrons in Y-90?
3) How many neutrons in Y-90?
4) Who is given credit for discovering the nucleus?
5) Which of the following is a metalloid?
sodium , silicon, nitrogen
6) Which of the following is a non-metal?
boron , sulfur, nickel
7) What group is germanium in?
8) What period is germanium in?
RedoTicket out the Door
Convert the following to scientific notation
1) 237,000
2) 50000
3) 0.00000045
Convert units – write units with #’s
4) 14 millimeters to meters
5) 50,000,000 milliliters to kiloliters
6) What is the density of a 75g sample that
occupies 3.5cm3 space?
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Define
mixture –
 solution homogeneous – uniform/same throughout
 heterogeneous – different throughout
 compound
 element
 substance
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