Download Matter,phases, Phys/chem changes and properties

MATTER,PHASES,
PHYS/CHEM CHANGES
AND PROPERTIES
Warm-Ups
Classify the following as either a physical or chemical property or
change. Write the letter P by physical properties and C by
chemical properties.
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Oxygen gas supports combustion, accompanied by flames
Hydrogen gas has the potential to ignite and explode.
Water boils below 100°C on top of a mountain.
Lead is denser than aluminum.
Salt dissolves in water.
Zinc reacts with hydrochloric acid and produces bubbles.
A plastic bottle is buoyant in water.
Two solutions are mixed together and produce a precipitate.
A piece of rock is crushed into smaller pieces.
A leaf changes color.
Physical Properties can either be classified as extensive or intensive.
Extensive properties depend on the amount of substance, where
intensive properties do not depend on the amount of substance. Place
an (E) by the extensive properties and an (I) by the intensive properties.
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Mass
Color
Length
Density
Volume
Height
Weight
Buoyancy
Viscosity
Ductility
Pure Substances have a constant composition and consistent
properties. Mixtures have variable composition and inconsistent
properties. Pure substances tend to be separated chemically while
mixtures can be separated physically. Label Pure Substances with (PS)
and Mixtures with (M).
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H
K
Steel (made with Fe and C)
Brass (made with Cu and Zn)
NaCl
H 2O
Concrete
Iron fillings and sulfur powder
Magnesium ribbon in HCl solution
Chex Mix
Mixtures are either homogeneous (uniform in composition throughout)
or heterogeneous (not uniform in composition throughout).
Heterogeneous mixtures have visible identifiable components, where in
homogeneous mixtures you cannot identify the components. Label the
following mixtures with (Het) for heterogeneous or (Hom) for
homogeneous.
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Kool-aid
Gravel
Ocean water
Concrete
Carbonated water
Tap Water
Distilled Water
Metal Alloys such as Beryllium Copper
Air in the atmosphere
Water with blue food coloring mixed in
Which of these describes a
pollution producing process that
involves only a physical change?
A. Coal with high sulfur content is
burned, producing gases that
cause acid rain.
B. Chlorofluorocarbons are released,
changing ozone in the upper
atmosphere into oxygen.
C. Hot wastewater is discharged into
a lake, lowering oxygen levels in
the water
D.Nitrogen oxide emissions combine
with water vapor, producing nitric
acid
Which of the following
statements describes a
difference between a mixture
and a pure substance?
A. A mixture needs to be
homogenous, while a pure
substance tends to be
heterogeneous.
B. A mixture has a specific melting
point, while the melting point of a
pure substance varies.
C. The density of a mixture cannot
change with temperature, but the
density of a pure substance can
change.
D.The composition of a mixture can
vary from sample to sample, but
the composition of a pure
substance is always the same.
Indicate whether each of the following is
a
A. pure substance
B. mixture
1. Dry Ice (solid carbon dioxide)
Determine whether each of the following is
a/an:
• chemical property
• intensive physical property
• extensive physical property
2. Aluminum foil
3. Brass
1. Corrosive
4. Liquid Nitrogen
2. Boiling point = 78 °C
5. A sample of black and silver powder melts
from 917 °C – 2021 °C and can be separated
using a magnet.
3. Density = 0.66 g/cm3
6. An unknown silvery powder has a single
melting point and does not chemically or
physically separate into other substances.
7. A colorless liquid that boils at 79 °C and can
be chemically decomposed into carbon,
hydrogen, and oxygen
4. Reacts with an acid to produce a
gas
5. Volume = 4.2 mL
6. Magnetic