1. What is an alloy
2. What is the difference between a homogenous and heterogenous mixture
3. Identify the following as homogenous or heterogenous mixtures:
4. a) salt water b) cholate chip ice-cream c) granite rock d) pizza

1. Describe the following mixtures as homogenous or heterogenous ............................................ a) saltwater... b) granite rock ...c) pizza ....d) fresh orange juice ......e) brass ....f) coke
2. From the seperation lab, write a new procedure for seperating Chef Neff's surprise. (to maximize your yield)

4/3-4

The following is a quote by Democritus (c. 460 – c. 370 BCE). Paraphrase this quote in your own words in your science journal

“Color exists by convention (agreement), sweet by convention (agreement), bitter by convention (agreement); in reality nothing exists but atoms and the void.”
What did Democritus mean? And why are his thoughts important?

1. What is an atom
2. Explain the difference between an atom and a molecule
3. What are the 3 sub-atomic particles and their charges?

1. Draw a Bohr model of the following atoms: Li, N, F, Al
2. Explain how 2 atoms of the exact same element can have different weights.

1. Draw a Bohr model for the following ions: Be+2, Br -1, S-2
2. If it is important for atoms to be neutral, why would an atom give up an electron?
3. If an atom gives up 1 electron what will be the charge on that atom, and what is the atom now called?
4. What do you know about all atoms that are in the same row as sodium?

April
13-14

How many "particles" in each of the following compounds:

• a) KI
• b) NaIOH)
• c) Na2(CO3)
• d) Pb(NO3)2
• e) Cu(NO3)2

Complete and balance the following :

a.) LiI + Pb(NO3)2

b.) Mg(CO3) + HCl

c.) KCl + Pb(NO3)2

1. Give 3 examples of evidence that a chemical reaction has occured.
2. Draw a Bohr model of Na+, Ne, Mg and P+3
3. Mg is going to bond with one of these (Ar, Sr, or Se) which one will it bond with?
4. Why will it bond with this one
5. What will be the formula?
6. What kind of bond is formed?

Balance the following equation:

LiI + Pb(NO2)2 --->

1. What is the general equation for a double replacement reaction?
2. What is a polyatomic ion?
3. Why do all the elements in column 2 of the periodic table get a charge pf +2?
4. Complete and balance this formula: KCl + Ba(OH)2 --->

1. What is an acid?
2. What is a base?
3. What are the products of an acid-base reaction?
4. What do you call an acid-base reaction?