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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 Matter6. 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 Matter6. 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 Matter7. 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 Intensive Physical Extensive Physical burned in air red 46 m
T of 55oC 88 g
turned blue when b.p. of 2570oC 42 cm2
mixed with a base liquid 265 mL dissolves in H2O 52 m3
produced a gas when spherical
mixed with acid crystalline
gas
red solid formed when 2.56 g/cm3
mixed with … smooth
m.p. of 1085oC
shiny
conducts electricity
malleable
magnetic
Warmup – Scientific Method and Matter7. 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 Matter8. 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 Matter8. Categorize the following as homogeneous mixtures, heterogeneous
mixtures, or pure substances.
Homogeneous mixture Heterogeneous mixture Pure substance
salt water orange juice with pulp silver
air pizza table salt
brass salad dressing
soil
salad
chocolate chip ice cream
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
