Download Gr 10 Review sheet chemistry

SCH3U
Grade 10 Review Sheet
NAME:
Recall:
In the periodic table, for each element:
Atomic Number
Element Symbol
Element Name
Average Atomic Mass
Remember the following relationships:
Atomic Number = the # of protons = the # of electrons (in a neutral atom)
Mass Number = the atomic mass of the most common isotope (round the
average atomic mass to the nearest whole number
Ex. For cobalt: Average Atomic Mass = 58.93 ≈ 59 = Mass Number
Atomic Notation
Mass Number
Atomic Number
59
27
Co
Number of Neutrons = Mass Number – Number of Protons
Ex. For cobalt: Number of neutrons = 59 – 27 = 32 neutrons
1. Complete the following chart:
Element
Name
Atomic
notation
11
5
Symbol
Atomic
number
B
Silver
Pb
36
Mass
number
# of
protons
# of
neutrons
# of
electrons
Recall:
Counting atoms:
2Ca(NO3)2
Coefficient
Subscripts
Coefficients  apply to all atoms in the compound.
Subscripts  apply only to the element that they follow.
Exception – if the subscript follows a bracket “)”, it is applied to all
elements in the bracket.
Ex. For calcium nitrate 2Ca(NO3)2
The coefficient (2) applies to all elements:
Therefore, 2 Ca atoms total
2 N atoms
2 O atoms
The subscript 3 only follows O so we have 2 x 3 O = 6 O
The subscript 2 is outside brackets, so it applies to N and O
Therefore, 2 x 6 O = 12 oxygen atoms total
2 x 2 N = 4 nitrogen atoms total
2. Give the name of each element and state the number of atoms of each
element in the following compounds:
CH3COOH
Name of element
# of atoms
2(NH4)2Cr2O7
Name of element
# of atoms
3. Chemical reactions produce______________substances by the breaking and
forming of__________.
The four indications that a new substance has formed are:
1. Change of________________
2. Formation of a ________________
3. Formation of _____________
4. Release or absorption of_____________
4. Complete the following table:
Chemical Name
Magnesium hydroxide
Ions present
Mg2+
OH-
Chemical Formula
Mg(OH)2
Ni(NO3)2
Beryllium iodide
N2O5
Lead (II) nitrite
Fluorine gas
Aluminum sulfate
Propane
Balancing Chemical Equations:
Add coefficients to each chemical formula (if needed), so that the same numbers
of atoms of each element are found on both sides of the arrow.
Not sure where to start?? Try using the “MINOH” method, by balancing
elements in the following order:
M – metals
I – polyatomic ions
N – non-metals
O – oxygen
H - hydrogen
5. Balance the following
____ AlBr3 + ____ K  ____ KBr + ____ Al
____ P4 + ____ Br2  ____ PBr3
____ CoBr3 + ____ CaSO4  ____ CaBr2 + ____ Co2(SO4)3
____ Na3P + ____ CaF2  ____ NaF + ____ Ca3P2
____ Mn + ____ HI  ____ H2 + ____ MnI3
6. Complete the following table:
Balance and complete the following reactions:
a)
b)
c)
d)
e)
__BaO2 __BaO + __O2
__C6H6 + __O2 
__H2 + __O2 
__K + __Ca(NO3)2 
__CaCl2 + __Na2CO3 
Classify each type of
reaction as
synthesis, decomposition,
single displacement,
double displacement, or
combustion
7. Indicate whether the following characteristics refer to acids or bases by
putting a check mark ( ) in the appropriate box.
Characteristic
Good conductors of electricity (electrolytes)
React with carbonates to produce CO2(g)
Will cause blue litmus paper to change red
Will cause red litmus paper to change blue
Sour taste (*NOTE: do not taste or touch in the
lab)
Have a pH greater than 7
Taste bitter and feel slippery (*NOTE: do not
taste or touch in the lab)
Have a pH less than 7
React with active metals to produce H2(g)
Acids
Bases
Both