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WorksheetsBenchmark #1 Review
Total questions: 45
Worksheet time: 28mins
Name
Class
Date
1.
Which of these determines the identify of an atom?
a)
number of electrons
b)
number of protons
c)
number of energy levels
d)
number of neutrons
2.
Sodium is an element found in table salt. It contains 11 protons and 12 neutrons. How many electrons are found in an atom of sodium?
a)
23
b)
12
c)
11
d)
1
3.
Elements are described as pure substances because
a)
they are all found in nature
b)
they cannot be separated into parts by physical means
c)
they have no charge
d)
they can be produced in a laboratory
4.
The nucleus of an atom contains
a)
only neutrons
b)
protons and neutrons
c)
protons and neutrons
d)
only electrons
5.
What are the name and atomic number of the element represented?
a)
K, 19
b)
K, 39.098
c)
potassium, 19
d)
potassium, 39.098
6.
How many electrons would an atom of the element shown in the picture have?
a)
19
b)
39
c)
58
d)
20
7.
How are the elements of the modern periodic table arranged?
a)
in alphabetical order
b)
by atomic mass
c)
by date of discovery
d)
by number of protons
8.
Which elements on the periodic table are least likely to combine with other elements?
a)
halogens
b)
noble gases
c)
alkaline earth metals
d)
transition metals
9.
Which of the following is an example of a chemical change?
a)
water boiling
b)
paper being cut
c)
ice melting
d)
iron rusting
10.
Which of these statements is false?
a)
The least reactive elements are in the far right column.
b)
Elements at the bottom of a column have more protons than elements at the top of a column.
c)
Elements on the left side of a row have higher atomic mass than elements on the right side of that row.
d)
Elements along the steplike line have some properties of metals and some properties of nonmetals.
11.
Carbon and oxygen combine chemically to form carbon dioxide. Carbon dioxide is
a)
an ion
b)
a nucleus
c)
a compound
d)
an atom
12.
Which of these statements about molecules is true?
a)
All molecules contain atoms of only one element.
b)
Two or more molecules can combine to form an atom.
c)
The elements in any molecule are always present in equal proportions.
d)
The atoms in a molecule cannot be separated from each other by physical means.
13.
How do the properties of a compound compare to the properties of the elements that make it up?
a)
The properties of the compound are the same as the properties of the elements that make it.
b)
The properties of the compound are different from the properties of the elements that make it up.
c)
The properties of the compound may vary, while the properties of the elements that make it up do not change.
d)
The properties of the compound are the same as the properties of only one of the elements.
14.
Which of these is not made up of two or more substances that are combined physically?
a)
homogeneous mixture
b)
compound
c)
heterogeneous mixture
d)
solution
15.
An unknown substance is provided in a science class. Looking at the substance, a student observes different colors and different sizes of particles evenly distributed throughout the substance. What type of solution is this?
a)
solution
b)
compound
c)
heterogeneous mixture
d)
homogeneous mixture
16.
What happens during a physical change?
a)
new substances form
b)
the identity of a substance is formed
c)
a chemical reaction occurs
d)
a property of a substance changes, but its identity stays the same
17.
Which is a clue that a chemical change has occurred?
a)
A beaker becomes warm when you mix two room-temperature liquids in it.
b)
A liquid forms bubbles when it reaches a high temperature.
c)
Water changes color when you add food coloring to it.
d)
A car door feels hot if you touch it on a summer afternoon.
18.
According to the law of conservation of mass, which of the following is a true statement about any chemical reaction?
a)
The total mass of the reactants is greater than the total mass of the products.
b)
The total mass of the reactants is less than the total mass of the products.
c)
The total mass of the reactants equals the total mass of the products.
d)
In a chemical reaction, matter can be created but not destroyed.
19.
Which of the following equations does NOT demonstrate the law of conservation of mass?
a)
2Na + Cl2 ---> 2NaCl
b)
NaOH + HCl ----> NaCl + H2O
c)
P4 + 5O2 ----> 2P4O10
d)
SnCl2 + FeCl -----> 2FeCl2 + SnCl4
20.
A small portion of the periodic table is shown in the picture. Which two elements are in the same group or family.
a)
Gallium (Ga) and Arsenic (As)
b)
Carbon (C) and Nitrogen (N)
c)
Aluminum (Al) and Phosphorus (P)
d)
Oxygen (O) and Sulfur (S)
21.
Elements in the same column or group of the periodic table have
a)
similar chemical properties
b)
the same number of neutrons
c)
similar atomic mass
d)
atoms of the same size
22.
The boiling point is 100 degrees C. This is a physical property. If there is a beaker with 100 mL of water and it boils at 100 degrees C, at what temperature will a beaker with 18 mL of water boil?
a)
18 degrees C
b)
100 degrees C
c)
0 degrees C
d)
118 degrees C
23.
Where are the metalloids located in the periodic table?
a)
in the far-right column
b)
in the far-left column
c)
in the top row
d)
along the step-like line
24.
Which of these contain most of Earth's water?
a)
oceans
b)
rivers
c)
lakes
d)
glaciers
25.
Where is most of the freshwater on Earth located?
a)
in the oceans
b)
in polar ice and glaciers
c)
in rivers, streams, and lakes
d)
under the ground
26.
A rock layer that collects and stores water is called
a)
an aquifer
b)
an estuary
c)
a glacier
d)
a hydrosphere
27.
An area of land that drains into a river or lake is called
a)
an ecosystem
b)
a wetland
c)
a watershed
d)
a habitat
28.
Pamilco Sound in NC is an estuary because it is
a)
an area fed by several rivers
b)
an area that many watersheds drain into
c)
an area that is protected by land on both sides
d)
an area where freshwater mixes with salt water
29.
An example of non-point source pollution is
a)
wastewater from a leaking pipe
b)
fertilizer from runoff
c)
oil tank leaking from underground tank
d)
chemicals released from a paper mill
30.
A clear example of point source pollution is
a)
trash floating in ocean water
b)
feedlot wastes in a river
c)
oil spilling from a supertanker
d)
salts from irrigation
31.
What is a possible effect of high nutrient levels in water systems?
a)
algal blooms
b)
fewer algae
c)
healthier fish
d)
hotter water
32.
Which of the following are indicators of a healthy water source?
a)
high nitrates, high pH, and low temperature
b)
low temperature, high dissolved oxygen, and neutral pH
c)
low pH, high nitrates, and low dissolved oxygen
d)
high turbidity, high dissolved oxygen, and high temperature
33.
Scientists tested water at a sampling site in the Neuss River watershed. They found that dissolved oxygen dropped to its lowest level during July. What is the most likely cause of the low dissolved oxygen data for July?
a)
high pH
b)
low turbidity
c)
high temperature
d)
low salinity
34.
Under which conditions are large numbers of fish in a lake most likely to die?
a)
right after a storm with heavy rainfall
b)
when the water's dissolved oxygen is high and temperatures are lower than average
c)
when the water's dissolved oxygen is low and temperatures are higher than normal
d)
when the water's turbidity is low and temperatures are in the average range
35.
Which one of the following water pH levels is best for marine organisms?
a)
1.0
b)
3.5
c)
8.0
d)
11.5
36.
A body of water that has high turbidity is
a)
cloudy
b)
clear
c)
basic
d)
acidic
37.
Which of these is considered a first-ordered consumer?
a)
rabbit
b)
fox
c)
hawk
d)
fern
38.
How much energy from one tropic (energy level) is transferred to the next?
a)
none of the energy is transferred
b)
about 1% of the energy is transferred
c)
about 10% of the energy is transferred
d)
all of the energy is transferred
39.
An organism that performs photosynthesis is called
a)
a decomposer
b)
a consumer
c)
an autotroph/producer
d)
a heterotroph/consumer
40.
Which organism in the food chain in the picture is a second-order consumer?
a)
grass
b)
snake
c)
grasshopper
d)
mouse
41.
Which of the following is a symbiotic relationship in which both organisms benefit?
a)
mutualism
b)
commensalism
c)
competition
d)
parasitism
42.
Which of the following organisms is most likely to have a predator/prey relationship?
a)
dog and tapeworm
b)
rhinoceros and oxpecker bird
c)
spider and fly
d)
fungus and green algae
43.
The cattle egret perches on a buffalo's back and is carried from one location to another. The buffalo is neither helped nor harmed. This is an example of
a)
mutualism
b)
commensalism
c)
parasitism
d)
predation
44.
A lamprey attaches itself to a larger fish and sucks the fish's blood. This is an example of
a)
mutualism
b)
commensalism
c)
parasitism
d)
competition
45.
The diagram in the picture shows a food web for a freshwater and saltwater ecosystem. A disease kills all the minnows in the ecosystem. This change is most likely to have which of the following effects?
a)
The grey heron population will increase.
b)
The dragonfly larvae population will increase.
c)
The ecosystem will not be affected.
d)
all species' populations on the food web will decrease.
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