CP Chemistry
Name ________________________________________Period ______
WS 4 - Review
1) What is the main difference between physical and chemical changes?
2) When powdered iron is left out in air, it rusts. Explain why the mass of the rusted iron is greater than the mass of
the iron. Is this a physical or chemical change?
3) You dissolve an acid (which is aqueous) in more water. The temperature of the solution increases.
This is a (chemical/physical) change.
4) You mix two aqueous chemicals and bubbles are given off and the temperature of the mixture decreases.
This is a (chemical/physical) change.
5) Classify each of the following as an element (E), compound (C), homogeneous mixture (HOM) or a
heterogeneous mixture (HET):
6)
a)
_______Oxygen gas, O2
f)
_______Salad dressing
b)
_______Brass alloy
g)
_______Steel
c)
_______Iron metal
h)
_______Calcium chloride
d)
_______FeO3
i)
_______Windex cleaner
e)
_______Ocean water
State whether each of the following properties is more typical of a metal (M) or non-metal (NM):
a)
____Dull powder
e)
____Ductile
b)
____High density
f)
____Gas state at 20°C
c)
____Reacts with non-metals only
g)
____ Lustrous
d)
____Brittle solid
7) Refer to the periodic table and classify each as a metal, non-metal or semimetal (M, NM, SM):
a)
___ selenium (34)
e)
___ thallium (81)
i)
___ bromine (35)
b)
___ manganese (25)
f)
___ calcium (20)
j)
___ tin (50)
c)
___ phosphorus (15)
g)
___ fluorine (9)
k)
___ polonium (84)
d)
___ aluminum (13)
h)
___ arsenic (33)
8) State whether each of the following is a physical or chemical property (PP or CP):
a) _____ Mg is a lightweight metal
d)
_____ Acid + Zn produces a gas
b) _____ Ag shows no reaction in acid
e)
_____ NaCl melts at 801ºC
c) _____ Carbon crystallizes as a diamond
f)
_____ Sugar dissolves in water
9) State whether each of the following is a chemical or physical change (PC or CC):
a) _____Calcium oxidizes to a white powder
e) _____H2 gas explodes
b) _____Sublimation
f) _____Bromine vaporizes to a gas
c) _____Combustion
g) _____Methanol freezes to a solid
d) _____Tin metal produces a colorless gas in
h) _____ Frying an egg
acid
i) _____Breaking a pencil in two
10) Which type(s) of physical means could be used to separate the following mixtures?
a) distillation
b) chromatography
c) filtration
d) magnetic character
_______ Iron fillings and sand
_______ Alcohol and water
_______ Pigments in ink
_______ Sand and salt
_______ Plastic and water
_______ Water and salt
_______ Sand and water
_______ Colored dyes in Kool-Aid
e) crystallization
11) Classify each statement by choosing one; if more than one choice is possible, explain why.
a) PP CP PC CC
A substance is a blue crystalline solid at room temperature.
b) PP CP PC CC
A second substance is a clear liquid at room temperature.
c) PP CP PC CC
The clear liquid has a temperature of 23.0°C, which is room temperature.
d) PP CP PC CC
A third substance is a shiny piece of metal foil at room temperature.
e) PP CP PC CC
When the blue crystalline solid is put into the clear liquid, it dissolves.
f) PP CP PC CC
The resulting solution turns green.
g) PP CP PC CC
The temperature of the solution is 24.0°C.
h) PP CP PC CC
The temperature of the solution changed from that of the clear liquid alone.
i) PP CP PC CC
The foil is malleable and can be manipulated and rolled.
j) PP CP PC CC
If the foil is added to the clear liquid alone, nothing happens.
k) PP CP PC CC
When placed in the green solution, the foil floats on top.
l) PP CP PC CC
When placed in the green solution, the foil reacts.
m) PP CP PC CC
A brownish substance appears on the foil.
n) PP CP PC CC
Bubbles appear on the foil.
o) PP CP PC CC
The brownish substance is a solid.
p) PP CP PC CC
The brownish substance falls to the bottom of the beaker.
q) PP CP PC CC
The foil has fallen apart and disappears.
r) PP CP PC CC
Some of the brown substance dissolve and discolor the liquid.
s) PP CP PC CC
Condensation forms on the sides of the beaker.
12) Is malleability an intensive or extensive property? Explain.