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WorksheetsSTAAR WARS: GR8 Science Rev 4
Total questions: 69
Worksheet time: 42mins
Name
Class
Date
1.
In the equation, 2Mg + O2 ---> 2MgO, which are the reactants?
a)
Mg and O
b)
MgO
c)
Mg and MgO
d)
O and MgO
2.
In chemical reactions, the law of conservation of mass is......
a)
disobeyed
b)
not true
c)
obeyed
d)
used sometime
3.
Balance this equation, Ca + H2O --> CaO + H2
a)
Ca + 2H2O --> CaO + 2H2
b)
2Ca + H2O --> CaO + H2
c)
Its balanced as it is
d)
Cannot be balanced
4.
Which word best describes this equation: Al2O3 ---> Al + O2
a)
Balanced
b)
Unbalanced
c)
Confusing
d)
Tasty
5.
Predict this reaction, K2O + H2O --> ?
a)
KO2 + H2O
b)
KH2O
c)
K2OH2O
d)
2KOH
6.
Which of these is a reactant?
a)
methane
b)
carbon dioxide
c)
water
d)
all of these
7.
Which of these is a product?
a)
methane
b)
carbon dioxide
c)
oxygen gas
d)
all of these
8.
How many reactants are in this equation?
a)
one
b)
two
c)
three
d)
four
9.
A change in which NEW substances are formed.
a)
Chemical change
b)
Physical change
c)
Casual change
d)
Formal change
10.
Is melting an object technically known as a chemical reaction?
a)
I don't know
b)
Yes
c)
No
11.
Which of the following could indicate a chemical change?
a)
All of the answers could indicate Chemical Change
b)
a color change has occurred
c)
bubbles appear
d)
identifying one or more new chemical products
12.
A copper penny turning greenish after a few years is an example of...
a)
Chemical Change
b)
Physical Change
13.
An gel ice pack getting cold after you put it in the freezer for an hour is an example of...
a)
Chemical Change
b)
Physical Change
14.
What part of an atom determines it's reactivity?
a)
Protons
b)
Nuetrons
c)
Electrons
d)
Valence Electrons
15.
How many atoms of Carbon does Octane have?
a)
4
b)
8
c)
6
d)
26
16.
How many atoms does glucose have?
a)
24
b)
18
c)
14
d)
8
17.
Elements in the same period have the same number of valence electrons.
a)
True
b)
False
18.
Elements in the same group have similar chemical reactions.
a)
True
b)
False
19.
In the image the bird is a
a)
primary consumer
b)
secondary consumer
c)
producer
d)
omnivore
20.
In the image the rat is a
a)
producer
b)
primary consumer
c)
secondary consumer
d)
decomposer
21.
How many atoms are on the reactant side of the chemical equation?
a)
14
b)
4
c)
10
d)
6
22.
How many atoms are on the products side of the equation?
a)
2
b)
4
c)
8
d)
10
23.
Which elements are the most reactive?
a)
Elements with more valence electrons.
b)
Elements with fewer valence electrons.
c)
Elements with 8 valence electrons
d)
Elements are not reactive.
24.
Which of the following is an element?
a)
CH4
b)
H2O
c)
O2
d)
Fe2O3
25.
4Fe + 3O2 ----> 2Fe2O3
Using the formula above, identify the compound(s).
Using the formula above, identify the compound(s).
a)
Fe
b)
O2
c)
2Fe2O3
d)
They are all compounds
26.
Which particle is represented by the atomic number?
a)
Protons
b)
Neutrons
c)
Electrons
27.
The following are properties of nonmetals except...?
a)
Dull
b)
Brittle
c)
Semi-conductors
d)
gain or share electrons
28.
Which group on the periodic table has 5 valence electrons
a)
Group 5
b)
Group 1
c)
Group 18
d)
Group 15
29.
Which of the following is an organic formula?
a)
CH4
b)
O2
c)
NaCl
d)
H2O
30.
All the elements on the elements on the right of the periodic table are called...
a)
Metals
b)
Metalloids
c)
Nonmetals
31.
All the elements on the left side of the periodic table are called..
a)
Metals
b)
Metalloid
c)
Nonmetals
32.
Beryllium is in group number______.
a)
Group 2
b)
Group 3
c)
Group 4
d)
Group 7
33.
How many rings does Barium Have?
a)
4
b)
5
c)
6
d)
2
34.
How many Valance electrons does Iodine Have?
a)
6
b)
16
c)
7
d)
17
35.
How many electrons can the first energy level hold?
a)
1
b)
2
c)
8
d)
0
36.
Which of the following is unique for any given element?
a)
the number of neutrons
b)
the charge on the electrons
c)
the number of protons
d)
the mass of a neutron
37.
The atomic mass of a single atom is
a)
the sum of the protons and neutrons in the atom.
b)
twice the number of protons in one atom of the element.
c)
a ratio based on the mass of a carbon-12 atom.
d)
a weighted average of the masses of the element’s isotopes.
38.
The dense center region of an atom
a)
electron cloud
b)
core
c)
nucleus
d)
centrino
39.
The part of the atom that determines the identity of the atom
a)
proton
b)
nucleus
c)
electron
d)
neutron
40.
Which particle is negatively charged?
a)
proton
b)
atom
c)
neutron
d)
electron
41.
What element is represented in this Bohr Model?
a)
Carbon
b)
Hydrogen
c)
Aluminum
d)
Lithium
42.
Most __________ conduct electricity very well.
a)
types of glass
b)
plastics
c)
metals
d)
types of rubber
43.
Which statement is true?
a)
Oil is the most dense substance.
b)
Corn syrup is less dense than water.
c)
Oil is less dense than water.
d)
Oil and corn syrup have the same density but different masses.
44.
Which of the following is NOT a type of organic compound?
a)
carbohydrates
b)
water
c)
lipids
d)
proteins
45.
The type of compound that contains carbon atoms bonded to other carbon atoms
a)
carbon
b)
organic
c)
molecule
d)
macromolecule
46.
A compound is a molecule consists of 2 or more ________.
a)
cells
b)
atoms
c)
element
d)
mixture
47.
A _______ is the basic unit of life
a)
cell
b)
atom
c)
compound
d)
organ
48.
A _______ is the smallest unit of matter.
a)
cell
b)
atom
c)
compound
d)
organ
49.
Which is a producer?
a)
deer
b)
tall grass
c)
lion
d)
worm
50.
A fox is an example of...
a)
Biotic Factor
b)
Abiotic Factor
51.
What is this called?
a)
Food Web
b)
Food Chain
c)
Abiotic Factors
52.
What is this called?
a)
Food Web
b)
Food Chain
c)
Abiotic Factors
53.
If a frog is the prey, what could be the predator?
a)
Grass
b)
Insect
c)
Snake
d)
Snail
54.
Water is an example of...
a)
Biotic Factor
b)
Abiotic Factor
55.
Where do all life forms get their energy?
a)
Earth's Core
b)
Water
c)
Plants
d)
The Sun
56.
What does a Primary Consumer eat?
a)
Tertiary Consumers
b)
Secondary Consumers
c)
Producers
57.
True or False. In this Food Web Pyramid the consumers on each level only get about 10 percent of energy that the plants have stored.
a)
True
b)
False
58.
In Australia the farmers had a problem with beetles eating the sugar cane. So they introduced the cane toad to control that population. Instead of eating the beetles, they ate the source of food and other organisms. What would be a possible consequence of this?
a)
The other organisms attacks the toad population
b)
The ecosystem would be destroyed
c)
The cane toads would get too much food and die
d)
The food web was changed by this one organism
59.
An organism that lives by breaking apart dead organic matter into simpler parts is...
a)
scavenger
b)
consumer
c)
decomposer
d)
carnivore
60.
In the energy pyramid below, which organism has the least amount of energy available?
a)
Producers
b)
Herbivores
c)
Carnivores
d)
Top Predator
61.
In the energy pyramid here, how much of the energy in the producers gets passed to the herbivores?
a)
10%
b)
20%
c)
80%
d)
90%
62.
In the food web shown, the snail would be considered...
a)
primary consumer
b)
secondary consumer
c)
tertiary consumer
d)
producer
63.
How many carnivores are shown in this food web?
a)
6
b)
4
c)
5
d)
3
64.
What is an organisms that makes its own food?
a)
Consumer
b)
Decomposer
c)
Producer
d)
Scavenger
65.
A relationship in which one organism is harmed while the other benefits.
a)
parasitism
b)
commensalism
c)
ouchyism
d)
mutualism
66.
An alligator and a plover bird are an example of what kind of relationship?
a)
mutualism
b)
parasitism
c)
commensalism
d)
idontcareism
67.
This is an image of a _________.
a)
consumer
b)
scavenger
c)
decomposer
d)
producer
68.
Main type of digestion that occurs in the stomach
a)
mechanical
b)
chemical
c)
amylase
d)
gallbladder
69.
Chewing food is an example of _____________.
a)
chemical digestion
b)
physical digestion
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