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Semester Review

Total questions: 83

Worksheet time: 7hrs 55mins

Name
Class
Date
1.
Which of the following is an example of a chemical reaction?
a)
A marshmallow turning black when heated over a fire
b)
A powder dissolving in water to make lemonade
c)
An ice cube melting into a puddle of water
d)
Salt crystals being crushed into a powder
2.
When heated, oxygen reacts with copper to form copper oxide:
If this reaction occurs in a sealed container, will the mass of the container and everything in it increase, decrease, or stay the same and why?
a)
The mass will stay the same because the number of each kind of atom stays the same.
b)
The mass will increase because a new kind of molecule is formed.
c)
The mass will decrease because two substances combine to form one substance.
d)
More information is needed to tell if the mass will change.
3.
What is the Law of Conservation of mass?
a)
Mass is created in a chemical reaction
b)
Mass is created in a physical change
c)
New chemicals formed from a chemical reaction have a larger overall mass than the original reactants
d)
Mass is never created or destroyed
4.
In a reaction A + B ----> C,  reactant A has 5g and product  C has 9g. How many grams should reactant B have? 
a)
4g
b)
5g
c)
9g
d)
14g
5.

A chemical reaction is balanced when

a)

Both sides have the same elements

b)

Both sides have the same elements and number of atoms

c)

Same subscripts

d)

Same coefficients

6.
Does this chemical equation follow the Law of Conservation of Mass?
a)
Yes
b)
No
c)
I don't know
d)
Maybe
7.

Which substances have the same number of Carbon atoms?

a)

2 and 4

b)

1 and 2

c)

1 and 3

d)

3 and 4

8.

How many atoms of oxygen are found in aluminum nitrate, Al(NO3)3?

a)

3

b)

6

c)

7

d)

9

9.

Sodium sulfate is used in laundry detergent. It is a compound that contains 2 atoms of sodium, 1 atom of sulfur, and 4 atoms of oxygen. What is the correct chemical formula for sodium sulfate?

a)

NA2SO4

b)

Na2S2O4

c)

Na2SO4

d)

Na2SO8

10.

How many total atoms are represented in the chemical formula H3PO4 ?

a)

3

b)

7

c)

8

d)

12

11.

The student observed that the temperature changed from 25°C to 23°C when the solutions were combined and that a white substance rapidly formed and settled to the bottom of the container. What most likely happened to produce these results?

a)

One of the original compounds came out of solution.

b)

The solutions reacted chemically.

c)

Some of the water froze into ice crystals.

d)

Rapid evaporation of water occurred, leaving a solid.

12.

There is enough oxygen inside this sealed glass container to allow the candle to burn until the candle is nearly used up.

a)

The candle’s mass was converted to energy.

b)

The total mass of the system did not change.

c)

There is more oxygen in the container now than at the start.

d)

The container is no longer lifted up by oxygen.

13.

A student performs the above reaction during a lab. The student masses the reactants and then performs the reaction. What is the mass (the amount of grams) of the products?

a)

19

b)

300.23

c)

20

d)

21

14.

How many atoms of oxygen are found in aluminum nitrate, Al(NO3)3?

a)

3

b)

6

c)

7

d)

9

15.
Jack has a rock. The rock has a mass of 14g and a volume of 2cm3. What is the density of the rock?
a)
7 mL
b)
7 g/cm3
c)
28 g/cm3
d)
1/7 g/cm3
16.
Frank has an eraser. It has a mass of 4g, and a volume of 2cm3. What is its density?
a)
8 g/cm3
b)
2 g/cm3
c)
1/2 g/cm3
d)
24 g/cm3
17.
Frank has a paper clip. It has a mass of 9g and a volume of 3cm3. What is its density?
a)
3 g/cm3
b)
1/3 g/cm3
c)
27 g/cm3
d)
39 g/cm3
18.
In the equation,          2Mg + O2 ---> 2MgO, which are the reactants?
a)
Mg and O
b)
MgO
c)
Mg and MgO
d)
O and MgO
19.
How many O's are in Al₂(SO₄)₃
a)
4
b)
12
c)
7
d)
24
20.
Is the equation balanced?: 2H2O + O2 --> 4MgO + 3Fe
a)
Yes
b)
No
21.
What is the difference between the number of electrons in an atom of Calcium, Ca, and the number of electrons in an atom of Aluminum, Al?
a)
20
b)
7
c)
13
d)
27
22.
How many neutrons does oxygen have?
a)
16
b)
15.99
c)
8
d)
Doesn't contain any neutrons
23.
How many neutrons does the an element with an atomic number of 3 and a mass of 6.9 contain?
a)
6.9
b)
4
c)
3
d)
7
24.
An atom has 5 protons, 6 neutrons, and 5 electrons. What is the charge of the atom's nucleus?
a)
-5
b)
+6
c)
+5
d)
-6
25.
Sodium has an atomic number of 11, how many protons does this atom have?
a)
22
b)
11
c)
12
d)
2
26.

Different elements can have the same number of protons?

a)

True

b)

False

27.

Which subatomic particles is counted to determine the type of element the atom represents?

a)

proton

b)

neutron

c)

electron

d)

boron

28.

The nucleus of an atom contains which subatomic particles?

a)

protons and electrons

b)

protons and neutrons

c)

electrons and neutrons

d)

protons, electrons, and neutrons

29.

Which subatomic particle has a negative charge?

a)

proton

b)

neutron

c)

electron

d)

cybertron

30.

Which subatomic particle as no charge, also known as a neutral charge?

a)

proton

b)

neutron

c)

electron

d)

chakra

31.
How many electrons does a Copper atom have?
a)
63
b)
29
c)
92
d)
34
32.
How many neutrons does a Hydrogen atom have?
a)
1
b)
2
c)
3
d)
0
33.
Atomic mass - Atomic Number =
a)
protons
b)
neutrons
c)
electrons
d)
Average Mass
34.
An element is defined by its number of 
a)
protons
b)
electrons
c)
neutrons
d)
protons + electrons
35.
How many valence electrons are in an atom of Se?
a)
2
b)
8
c)
6
d)
5
36.
How many valence electrons are in an atom of Sn?
a)
3
b)
8
c)
4
d)
1
37.
How many valence electrons are in an atom of P?
a)
4
b)
5
c)
2
d)
3
38.
Which group has the greatest number of valence electrons?
a)
1
b)
14
c)
18
d)
16
39.
a)
2
b)
8
c)
3
d)
13
40.
What element is this?
a)
Helium
b)
Hydrogen
c)
Argon
d)
Silver
41.
a)
Same group
b)
Same period
42.
a)
Periods
b)
Groups
43.
a)
Periods
b)
Groups
44.
a)
Metals
b)
Nonmetals
c)
Metalloids
45.
a)
Metals
b)
Nonmetals
c)
Metalloids
46.
a)
Metals
b)
Nonmetals
c)
Metalloids
47.
a)
Metals
b)
Nonmetals
c)
Metalloids
48.
This class of elements are sometimes called "semiconductors."
a)
Metals
b)
Nonmetals
c)
Metalloids
d)
Groups
49.

The last group of the periodic table is made up of gases that never form compounds. This group is known as the

a)

alkali metals

b)

alkaline earth metals

c)

halogens

d)

noble gases

50.
An element's identity is determined by the number of
a)
electrons.
b)
protons.
c)
neutrons.
d)
valence.
51.
Which of the following is not a property of metals?
a)
brittle
b)
malleable
c)
lustrous
d)
conductive
52.

The blue elements are called

a)

metals

b)

nonmetals

c)

metalloids

d)

noble gases

53.
The yellow atoms are called 
a)
metals
b)
nonmetals
c)
metalloids
d)
noble gases
54.
How would this element be classified?
a)
Metal
b)
Nonmetal
c)
Metalloid
d)
Metamorphic
55.
What does ductile mean?
a)
electricity flows easily
b)
quacks like a duck
c)
can be drawn into a wire
d)
able to bend
56.
What does malleable mean?
a)
able to bend
b)
will break easily
c)
can be used for wire
d)
is shiny
57.

Number of Carbon atoms in 2Na₂CO₃

a)

1

b)

2

c)

3

d)

5

58.

Elements in the same Row/Period in the periodic table have the same number of _______

a)

protons

b)

electrons

c)

valence electrons

d)

energy levels

59.

What is the density of the rock if it has a mass of 60g?

a)

5 g/ml

b)

12 g/ml

c)

12 ml

d)

5 ml

60.
One way that humans could have a positive impact on local environments is to:
a)
generate waste products as a result of technological advances
b)
use resources that are renewable
c)
increase planting large areas of one crop
d)
increase the use of pesticides
61.
When fertilizers run off farmland into streams and ponds, the nitrogen content of the water increases. This can lead to rapid growth of algae in a process called eutrophication. How can this process affect other organisms in the water?
a)
Oxygen is used up as algae is decomposed, reducing the amount available to other organisms.
b)
The water becomes better able to support aerobic organisms.
c)
The algae provide food for fishes and other organisms, leading to decreased algae populations.
d)
The extra nitrogen provides additional food for the other organisms, increasing their population.
62.
Why is it important to conserve the biodiversity of Earth?
a)
to decrease the amount of global predator populations
b)
to decrease the stability of major global ocean currents
c)
to increase the stability of ecosystems during environmental changes
d)
to increase the amount of nonrenewable resources located in the lithosphere
63.

This graph shows the sources of the nitrogen entering the Gulf of Mexico as pollution. What is one conclusion you can make based on the information in the graph?

a)

Nitrogen that comes from the atmosphere is more harmful than nitrogen that comes from crops.

b)

Most nitrogen pollution found in the Gulf of Mexico comes from farming crops.

c)

Corn and soybeans are the only crops associated with nitrogen pollution.

d)

Nitrogen is not a problem in the Gulf of Mexico.

64.

The diagram below shows the relationship between some of the organisms in a marine food web. Which of the following is MOST LIKELY to happen if a large number of phytoplankton are killed from runoff entering the ocean?

a)

The number of porpoises would probably stay the same because porpoises are far removed from phytoplankton in the food web

b)

The number of zooplankton would probably increase because they wouldn’t have to compete with phytoplankton for food.

c)

The number of salmon would probably decrease because there would be less food available for zooplankton and herring.

d)

The Sun would probably not emit as much energy because there would not be as many phytoplankton in the ocean.

65.

Wild Soay sheep live in a cold environment on a small Scottish island. The sheep used to be large because they gained extra weight during the summers in order to survive the harsh winters. A recent change in the island’s climate has caused grass to be available for a longer period each year, so survival conditions for the sheep have become less challenging.


Researchers who study these sheep have most likely observed a decrease in the wild Soay's --

a)

Size

b)

life expectancy

c)

reproduction rates

d)

body temperature

66.

Koalas live almost entirely on leaves from eucalyptus trees and they are native exclusively to Australia. Destruction of the Koalas’ habitat will most likely lead to -

a)

koalas eating other kinds of leaves.

b)

the koalas becoming larger.

c)

the reduction of the koala population.

d)

koalas producing more offspring.

67.

When European settlers first came to North Carolina, they cleared land for farms and raised sheep and cattle. What effect did this have on space, competition, and populations of Eastern elk and wood bison?

a)

Space decreased, competition increased, and bison and elk populations decreased.

b)

Space decreased, competition decreased, and bison and elk populations decreased.

c)

Space increased, competition decreased, and bison and elk populations increased.

d)

Space increased, competition increased, and bison and elk populations decreased.

68.

Suppose most of the rabbits in an area suddenly die from a disease. What would happen to the populations of the rabbits' predators and competitors?

a)

Populations of both predators and competitors would increase.

b)

Populations of predators would increase, and those of competitors would decrease.

c)

Populations of predators would decrease, and those of competitors would increase

d)

Populations of both predators and competitors would decrease.

69.

A population of small fish and a population of small squids eat the same type of krill (a type of plant) in the same ecosystem. Krill is the main source of food for both the fish and squid. If the squid grows faster than the fish population, what will most likely happen to the fish population?

a)

The fish population will stay the same size.

b)

The fish population will start to grow faster.

c)

The fish population will get smaller or even die out.

d)

The fish population will start to eat more krill than the squids.

70.

Which front is there little movement?

a)

warm front

b)

cold front

c)

occluded front

d)

stationary front

71.

What happens when two air masses meet?

a)

a hurricane occurs

b)

a dog barks

c)

a front is created

d)

warm air enters

72.
Which system results in drier, fairer weather?
a)
high pressure
b)
low pressure
c)
hurricane
d)
weather system
73.
What provides the energy for hurricanes to be sustained?
a)
warm water
b)
cold air masses
c)
wind from Austrailia
d)
cold water
74.
A hurricane gets its energy from
a)
Warm ocean waters
b)
high air pressure
c)
winds along surface
d)
Sun
75.
Hurricanes weaken above land because they cannot suck up warm and moist water.
a)
True
b)
False
76.
What destroys a hurricane? 
a)
Strong vertical winds
b)
Cold water
c)
Movement over land
d)
All of the above
77.
Warm ocean currents generally come from
a)
The North Pole
b)
The South Pole
c)
The Equator
d)
Both A and B
78.
Ocean currents have an affect on which two things
a)
climate and weather
b)
temperature and density
c)
land and sea
d)
equator and poles
79.
Analyze the map.
Why is it colder in San Diego than it is in Charleston even though they are the same distance from the Equator?
a)
San Diego is affected by the Gulf Stream
b)
Charleston is affected by the California current
c)
San Diego is affected by the California Current
80.
Analyze the map.
Why is it warmer in Charleston than it is in San Diego even though they are the same distance from the Equator?
a)
San Diego is affected by the Gulf Stream
b)
Charleston is affected by the California current
c)
Charleston is affected by the Gulf Stream
81.
Hurricanes can only form where the ocean water is ______________________.
a)
80 degrees and above
b)
below 80 degrees
c)
above 50 degrees
82.
What is the best forecast for New Orleans, Louisiana (yellow star) in this image?
a)
Warmer temperatures with gentle rain
b)
No change in temperature and slight chance of rain
c)
Cooler temperatures with clear skies
d)
Cooler temperatures with chance of thunderstorms
83.
What type of weather is Watauga, Texas likely experiencing in this image?
a)
Clear, sunny skies and cool weather
b)
High winds and thunderstorms
c)
Hot weather with a warm front
d)
Cloudy skies with high winds

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