Unit
4 Take Home Test Name______________________
Science
1 Date____________
Period______
___1.
Why must chemical equations be balanced?
___2. Define "reactants"
___________________________________________________________________________________
___3. Define
"products"____________________________________________________________________________________
___4.
Pg. 471 #1 (Explain how you know)
___5. Pg. 471 #2
6. Pg. 471 # 3
___a)
___b)
___c)
7.
How many of each atom is in the following chemical formulas:
___a) 3MgO
___b) 2C6H12O6
___c) 5Mg(OH)2
___d) 2Al2(PO4)3
___e) 3H2SO4
___8.
In a chemical equation what does a coefficient
do?___________________________________________________________
___9.
In a chemical equation what does a subscript
do?____________________________________________________________
___10. What does a subscript do if it follows atoms
in parentheses?__________________________________________________
11. ___a)
What is a hydronium ion?________________________________________________________________________
___b) What is its charge and why does it have that
charge?__________________________________________________
___c) What is a hydroxyl
ion?_________________________________________________________________________
___d) What is its charge and why does it have that
charge?__________________________________________________
___12.
If a solution is an acid it has more _______________ ions than ________________
ions?
___13.
Pure water has a pH of 7. Explain
why? Why do we call it neutral?
14. What is the pH for the following ratios of
hydronium ions to water molecules? Acid or Base?
___a) 1 :
100,000
___b) 1 :
100,000,000,000
___c) 1 :
100
15. Write the ratio of hydronium ions to water
molecules for the following pH's. Acid or Base?
___a) pH = 3
___b) pH = 12
___c) pH = 6