Transcript Review ppt - Chemistry with Dr. Hart

Warmup – Scientific Method
and Matter
1. Matter is defined as anything that
a) exists in nature.
b) is solid to the touch.
c) is found in the universe.
d) has mass and takes up space.
Warmup – Scientific Method
and Matter
1. Matter is defined as anything that
a) exists in nature.
b) is solid to the touch.
c) is found in the universe.
d) has mass and takes up space.
Warmup – Scientific Method
and Matter
2. All of the following are physical properties
of table sugar (sucrose) EXCEPT
a) forms solid crystals at room
temperature.
b) appears as crystals white in color.
c) breaks down into carbon and water
vapor when heated.
d) tastes sweet.
Warmup – Scientific Method
and Matter
2. All of the following are physical properties
of table sugar (sucrose) EXCEPT
a) forms solid crystals at room
temperature.
b) appears as crystals white in color.
c) breaks down into carbon and water
vapor when heated.
d) tastes sweet.
Warmup – Scientific Method
and Matter
3. A substance is said to be in the solid
state if
a) it is hard and rigid.
b) it can be compressed into a smaller
volume.
c) it takes the shape of the container.
d) its matter particles are close
together.
Warmup – Scientific Method
and Matter
3. A substance is said to be in the solid
state if
a) it is hard and rigid.
b) it can be compressed into a smaller
volume.
c) it takes the shape of the container.
d) its matter particles are close
together.
Warmup – Scientific Method
and Matter
4. A heterogeneous mixture
a) cannot be separated by physical
means.
b) is composed of distinct areas of
composition.
c) is also called a solution.
d) has the same composition
throughout.
Warmup – Scientific Method
and Matter
4. A heterogeneous mixture
a) cannot be separated by physical
means.
b) is composed of distinct areas of
composition.
c) is also called a solution.
d) has the same composition
throughout.
Warmup – Scientific Method
and Matter
5. Which of the following is NOT a chemical
reaction?
a) dissolution of sodium chloride in
water
b) combustion of gasoline
c) fading of wallpaper by sunlight
d) curdling of milk
Warmup – Scientific Method
and Matter
5. Which of the following is NOT a chemical
reaction?
a) dissolution of sodium chloride in
water
b) combustion of gasoline
c) fading of wallpaper by sunlight
d) curdling of milk
Warmup – Scientific Method and Matter
6. Which of the following are ENDOTHERMIC
changes? Explain your reasoning.
a) burning match
b) ice cubes melting in a cold drink on
a hot summer day
c) freezing ice cubes
d) vaporization of dry ice (CO2)
e) melting iron in a smelter
f) two solutions mixed together become
cold to the touch
Warmup – Scientific Method and Matter
6. Which of the following are ENDOTHERMIC
changes? Explain your reasoning.
a) burning match
b) ice cubes melting in a cold drink on
a hot summer day
c) freezing ice cubes
d) vaporization of dry ice (CO2)
e) melting iron in a smelter
f) two solutions mixed together become
cold to the touch
Warmup – Scientific Method and Matter
7. a) Divide this list into intensive chemical, intensive
physical and extensive physical properties.
red
46 m
b.p. of 2570oC
T of 55oC
liquid
spherical
dissolves in H2O
42 cm2
crystalline
88 g
burned in air
gas
smooth
m.p. of 1085oC
shiny
2.56 g/cm3
conducts electricity malleable
magnetic
turned blue when mixed with a base
produced a gas when mixed with acid
265 mL
52 m3
red solid formed when mixed with …
7. a) Divide this list into intensive chemical, intensive
physical and extensive physical properties.
Intensive Chemical
burned in air
turned blue when
mixed with a base
produced a gas when
mixed with acid
red solid formed when
mixed with …
Intensive Physical
red
T of 55oC
b.p. of 2570oC
liquid
dissolves in H2O
spherical
crystalline
gas
2.56 g/cm3
smooth
m.p. of 1085oC
shiny
conducts electricity
malleable
magnetic
Extensive Physical
46 m
88 g
42 cm2
265 mL
52 m3
Warmup – Scientific Method and Matter
7. b) Compare your lists.
What is common among the physical properties? i.e. What
distinguishes them from chemical properties?
What is different between the two lists of physical
properties? What distinguishes an intensive physical
property from an extensive physical property?
Which physical properties were difficult/confusing to
categorize? Why?
What simple questions can you ask yourself to help
categorize properties as chemical intensive, physical
intensive or physical extensive?
7. b) Compare your lists.
What is common among the physical properties? i.e. What distinguishes them
from chemical properties?
No change in chemical composition
What is different between the two lists of physical properties?
What distinguishes an intensive physical property from an extensive physical
property? Intensive – same property throughout the piece of matter. Extensive
– depends on the amount of the piece of matter
Which physical properties were difficult/confusing to categorize? Why?
The ones with numbers – no really quick way to figure them out, had to think
about them a bit
What simple questions can you ask yourself to help categorize properties as
chemical intensive, physical intensive or physical extensive?
Is there a change in chemical composition?
Can I reverse the process using physical means?
Will the property change if I change the amount?
Warmup – Scientific Method and Matter
8. Categorize the following as homogeneous mixtures,
heterogeneous mixtures, or pure substances.
silver
orange juice with pulp
table salt
pizza
salad dressing
soil
salt water
air
salad
brass
chocolate chip ice cream
Explain your reasoning.
What simple questions can you ask yourself to help you
choose the correct category?
Warmup – Scientific Method and Matter
8.
Categorize the following as homogeneous mixtures, heterogeneous
mixtures, or pure substances.
Homogeneous mixture
Heterogeneous mixture
Pure substance
salt water
air
brass
orange juice with pulp
pizza
salad dressing
soil
salad
chocolate chip ice cream
silver
table salt
Explain your reasoning.
What simple questions can you ask yourself to help you
choose the correct category?
Can I separate the mixture by physical means?  yes = mixture
Is the composition uniform?  yes = homogeneous mixture