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Science STAAR
Science STAAR
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1
If an element is in group 2 and period 3, what statement is true?
It has two shells and three valence electrons.
It has 2 total electrons and two shells.
It has two total electrons and three shells.
It has two valence electrons and three shells.
2
All the following chemical equations are balanced except —
Zn+ 2HCl → ZnCl2 + H2
WO3 + 3H2 → W + 3H2O
C3H8 + O2 → 3CO2 + 4H2O
RbBr+ AgCl → AgBr + RbCl
3
A boy pulls on his dog’s leash, but the dog does not move. Since the dog did not move, –
No friction kept the dog from moving
No force was applied to the dog
No work was done on the dog
No gravity was acting on the dog
4
Which describes the energy transformation that occurs in plants during photosynthesis?
Radiant energy is transformed into chemical energy.
Radiant energy is transformed into thermal energy.
Chemical energy is transformed into thermal energy.
Chemical energy is transformed into radiant energy.
5
Which is an example of a chemical reaction producing a precipitate?
A solid forming from mixing two liquids.
A gas being produced.
A color change.
A temperature change.
6
All of the following are indicators of a chemical change except —
Change in temperature
Formation of a precipitate
Formation of a gas
Change in the state of matter
7
Which subatomic particle defines the identity of an element?
Electrons
Protons
Neutrons
Nucleus
8
Which two phases of the moon will bring higher high tides than normal?
New and full moon
Full and gibbous moons
First and third quarter moon
New and crescent moon
9
Which of the following is an example of a chemical change related to digestion?
Squeezing the food down the esophagus
Swallowing the food
Chewing the food
Stomach acids breaking down food
10
Which level of the energy pyramid have the greatest amount energy available to them?
the producers
the herbivores
the apex predator
the carnivores
11
Ladybugs eat aphids, a type of soft-bodied insect. They are classified as—
Autotropic plats
Heterotropic fungi
Autotropic animals
Heterotropic animals
12
An element is shiny, malleable, and a good conductorof electricity, what type is it?
Metal
A gas
Non-metal
Metalloid
13
What type of weather is an area under high pressure most likely to experience?
Dry and sunny
Cold and rainy
Cold and sunny
Hot and rainy
14
What area would have an element that is brittle, but still conducts electricity?
2
1
4
3
15
Which of the following compounds should be placed in the box to represent the products? (8.5E)
CO
CO2
C2O2
Co2
16
For which of the biotic factors are the fish and frog competing?
Water
Algae
Heron
Insect
17
According to Newton’s Law of Inertia, a ball that is rolling on the ground will continue to-
roll because there is no force acting on it
roll regardless on the forces acting on it.
roll unless there is an unbalanced force acting on it
continue to sit still because of the balanced forces.
18
At which point on a roller coaster does the car have the most kinetic energy?
At the top of the second hill.
At the top of the first hill.
At the bottom of the second hill.
At the bottom of the first hill.
19
What definition matches the object pictured?
Gas and dust that give rise to stars
A flaming ball of hydrogen and helium
Stars and nebulas that has an irregular shape
Billions of stars, gas and dust, with a spiral shape
20
Which of the following would astronomers most likely measure in light-years?
Distance between stars
Time it takes to travel to Jupiter
Time it takes to travel to Proxima Centauri
Distance between Earth and the Moon
21
What positions of the Moon, Sun and Earth create Neap tides?
Waning moons
Waxing moons
Quarter moons
New and Full moon
22
Which explains why the oceans have a greater impact on the weather than the continents?
Oceanwaves move more easily than continental rock
Oceanwater contains more salt than most lake water
The oceans store and transfer more heat than the continents.
Theoceans contain a wider variety of organisms
23
Which moon phase would be created when the Moon, Earth and Sun make a 90 degree angle?
Crescent moon
Quarter moon
Full moon
Gibbous moon
24
What group on the Periodic Table would be most reactive?
Group 8
Group 1
Group 5
Group 4
25
What is the formula of the sulfuric acid molecule pictured?
HSO
HSO4
HS2O4
H2SO4
26
How many total atoms in
3CO
2
?
5
3
4
9
27
What is the density of cork if it's mass is 25 g and it's volume is 100 cm
3
?
0.25 g.cm3
4 g/cm3
125 g/cm3
75 g/cm3
28
A student observes some sugar as it burns. Which provides evidence of a chemical reaction?
Heat is added to the sugar.
A gas is produced and the sugar turns black.
The temperature of the sugar increases.
The sugar melts and becomes a liquid.
29
What is true of one of the subatomic particles located in area X?
Has a mass of 0 amu
Has mass, but no charge.
Has no mass, but a positive charge.
Has a negative charge
30
Which of the following best describes the days and nights shown in the diagram for spot Z?
It is summer, so short days and long nights
It is summer, so long days and short nights
It is winter, so short days and long nights
It is winter, so long days and short nights
31
Which statement is true about biodiversity and the sustainable of an ecosystem?
Biodiversity has a positive effect on an ecosystem.
Biodiversity and sustainability are not related
Biodiversity has no effect on the sustainability.
Biodiversity has a negative effect on an ecosystem.
32
If the wolf population increased within the food web, the result would be ___
the hawk population decreasing
the mouse population decreasing
the snake population decreasing
the rabbit population decreasing
33
What does the Hertzsprung-Russell diagram tell us about the star, Betelgeuse?
Ithas high surface temperature and low luminosity
It has high surfacetemperature and high luminosity
Ithas a low surface temperature and high luminosity
Ithas low surface temperature and low luminosity
34
A motorcycle traveling 35 mi/hr slows as it approaches a stop sign. This is an example of __
distance
acceleration
velocity
speed
