Transcript Element vs. Compound Carbon Sample Questions for SS 6.5C: 1. Which substance cannot be decomposed into simpler substances? A.

Element vs. Compound
Carbon
Sample Questions for SS 6.5C:
1. Which substance cannot be decomposed into
simpler substances?
A. ammonia (NH3)
B. carbon (C)
C. water (H2O)
D. glucose (C6H12O6)
2. Which of the following would be found only in
the Compounds side of the Venn diagram shown
above?
A. III, IV
C. II, III
B. I, VI
D. IV, V
Physical Properties
Metals
Nonmetals
Metalloids
Shiny (lustrous)
Not shiny (dull)
Can be shiny or dull
Good conductor of
heat & electricity
Conducts better than
Poor conductor of heat
nonmetals, not as well
& electricity
as metals
Malleable
Not malleable
Malleable
Ductile
Not ductile
Ductile
Sample Question for SS 6.6A:
I. Metal
II. Metalloid
III. Non-metal
3. You are testing a silver rock with the lab
equipment shown in the diagram. The silver rock
has a positive test. What can you narrow the
sample down to?
A. I
C. I, II. III
B. I, II
D. II, III
Density
Sample Question for SS 6.6B:
4. A field geologist collected data for two nuggets of copper
and determined their density. Which two pieces of equipment
did the geologist most likely use to determine the density of
the copper nuggets?
A. a balance & a graduated cylinder
B. a metric ruler & a beaker
C. a thermometer & an Erlenmeyer flask
D. a specimen bottle & a pair of forceps
Review of atomic structure
What are these subatomic particles?
Proton
Neutron
Electron
What determines the identity of an
element?
The number of protons…or….the
atomic number!
Atomic number = number of protons
Review of atomic structure
What are these subatomic particles?
Proton
Neutron
Electron
What determines the chemical
properties or reactivity of an element?
The valence electrons!
Sample Question for RS 8.5A:
5. Which statement best describes one of the
subatomic particles that could be found at
location X?
A. it has mass but no charge
B. it has no mass & a positive charge
C. it has a large mass & a negative
charge
D. it has no mass & a negative charge
Valence Electrons
An electron in an outer shell of an
atom that can participate in forming
chemical bonds with other atoms
Sample Question for RS 8.5B:
6. Observe the diagram of a water molecule above.
Choose a statement that best describes why the
chemical formula for water is H2O.
A. oxygen is a nonmetal & hydrogen is a gas
B. the two elements bond together because
both elements are gases
C. oxygen has six valence electrons which
bond with two hydrogen valence electrons making
the last energy level complete
D. hydrogen loses its valence electrons
making it a negative ion, & oxygen gains those
electrons making it a positive ion
Periodic Table
Group= vertical column with similar chemical
& physical properties (same # of valance
electrons)
Periodic Table
Period= horizontal row with changing
chemical properties (# of protons & electrons
increases from left to right)
Sample Question for RS 8.5C:
7. An element has a metallic-gray appearance. It
also has the properties of both a metal and a
nonmetal. In which section of the periodic table
indicated above would the element most likely be
found?
A. 1
C. 3
B. 2
D. 4
Chemical Formulas
What is it?
# of carbon atoms=___
# of hydrogen atoms=___
# of oxygen atoms= ___
What does it look like?
Sample Questions for RS 8.5D:
8. The chemical formula for baking soda is made
from one atom of sodium, carbon, hydrogen & three
atoms of oxygen. Which of the following best
represents the correct formula?
A. SHCo3
B. NaHCo3
C. NaHCO3
D. NaH(CO)3
9. The chemical formula for aspirin is C9H8O4.
Which best describes the number of atoms of each
element in the formula?
A. 9 chlorines, 8 heliums, 4 oxygens
B. 9 carbons, 17 hydrogens, 21 oxygens
C. 9 chlorines, 8 heliums, 21 oxygens
D. 9 carbons, 8 hydrogens, 4 oxygens
Chemical Reactions
Sample Questions for RS 8.5E:
10. A student observes some sugar as it is heated & burns.
The student concludes that a chemical reaction has occurred.
Which of the following observations about the burning sugar
provides evidence of a chemical reaction?
A. heat is added to the sugar crystals
B. the sugar melts & becomes a liquid
C. the temperature of the sugar increases
D. gas is produced as the sugar turns black
11. The equation above shows the chemical reaction for
burning coal. Which of the following best explains the reaction
represented by this equation?
A. carbon dioxide gas breaks down into solid carbon &
oxygen gas
B. solid carbon reacts with oxygen gas to produce
carbon dioxide gas
C. solid carbon, oxygen gas, & carbon dioxide gas react
to form products
D. oxygen gas heats solid carbon, melting the carbon
into a liquid
Law of Conservation of Mass
Sample Questions for SS 8.5F:
12. Which reaction between methane gas &
oxygen supports the Law of Conservation of
Mass?
A. CH4 + O2 --> CO2 + H2O
B. CH4 + 2O2 --> CO2 + 2H2O
C. 2CH4 + O2 --> 2CO2 + 2H2O
D. 2CH4 + 2O2 --> 2CO2 + 3H2O
13. If 32 grams of oxygen is combined with
4 grams of hydrogen, how much water would
be formed?
A. 4 grams
C. 32 grams
B. 28 grams
D. 36 grams
Chemical Reactions- Evidence That
New Substances Are Formed
Sample Question for RS 8.5E:
14. A student placed 2 grams of baking soda in
a balloon & 100 mL of vinegar in an Erlenmeyer
flask. After stretching the opening of the balloon
across the neck of the flask, the student raised it to
dump the baking soda into the flask. She
immediately observed foaming bubbles in the flask
& the balloon began to expand. The student
concluded that:
A. a physical change only was occurring.
B. the bubbles indicated a chemical
change was occurring.
C. the baking soda & vinegar were products of
a chemical reaction.
D. the gas that was produced was oxygen.
Food Chain
Snake
Lizard
Grasshopper
Grass
Food Web
Trophic Levels
Trophic Levels
10%
Trophic Levels
90%
Sample Question for SS 7.5C:
15. Choose the best statement that reflects the
transformation of energy processes found within an
ecosystem.
A. When plants grow, they produce energy
that is used by all organisms in higher levels.
B. Plants are producers for an ecosystem; all
organisms eat plants so energy is passed to other
levels.
C. The sun provides the initial energy for
producers; consumers eat producers & other
consumers which causes energy to be passed on to
higher levels.
D. Decomposers produce energy for plants by
breaking down dead matter; this is the initial step
towards the transformation of energy for each
trophic level.
Organic Compounds Contain
Carbon + Other Elements
Physical Change
a change from one state (solid or liquid or
gas) to another without a change in
chemical composition
Chemical Change
any change from one state (gas, liquid,
solid) which is accompanied by alteration of
the chemical composition
Physical vs. Chemical Changes
in Matter- Digestive System
Sample Question for SS 7.6B:
I.
II.
III.
IV.
Chewing & mixing food with saliva in the mouth
Movement of food using peristalsis through the esophagus
Reaction of food with hydrochloric acid in the stomach
Interaction of food with bile in the small intestine
16. Which of the following digestive processes
will be found in the middle of the Venn diagram?
A. I
C. III
B. II
D. IV