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Worksheets8th Science STAAR Review
Total questions: 46
Worksheet time: 28mins
Which of the following is classified as an element?
NaCl
CO
Na
H2O
Which part of the atom determines the element’s identity?
Atoms
Neutrons
Protons
Electrons
A student rides a bicycle down a hill. At which point do the student and the bicycle have the most potential energy?
1
2
3
4
A student rode a bicycle 15 miles in 90 minutes. What was the student’s average speed in miles per hour?
10 mph
17 mph
20 mph
30 mph
Which of the following keeps Earth in its orbit?
the rotation of Earth
the gravity of the sun
the revolution of the moon
the gravity of the moon
What unit do scientists use to measure size and distance in space?
Kilometers
Miles
Light Years
Moon units
Mushrooms and yeasts are classified together in the fungi kingdom. Specific characteristics are used to classify these organisms. Which of the following is a characteristic used to classify these organisms as fungi?
They are parasites.
They are unicellular.
They are prokaryotes.
They are heterotrophs.
Blue whales live in oceans. What type of factors do they rely on for their existence?
Only biotic factors
Only abiotic factors
Both biotic and abiotic factors
Neither biotic nor abiotic factors
A metal body of mass 189 g occupies a volume of 70 cm3. Identify the metal. Use the chart below and identify what metal you have.
Tungsten
Lead
Aluminum
Iron
Which of the following compounds is considered an organic compound?
C6H12O6
H2O
NaCl
CaCl2
Gail’s cross-country coach advised her to eat well-balanced meals in order to have plenty of energy for their upcoming track meet. To which transformation of energy is Gail’s coach referring?
heat energy to mechanical energy
mechanical energy to electrical energy
chemical energy to mechanical energy
thermodynamic energy to dynamic energy
Calculate the net force. Include magnitude AND direction.
362.5 right
4.5 left
4.5 right
362.5 left
What type of weather would you expect if a warm front is moving through your area?
Several days of light rain followed by warm, humid weather
Several days of strong thunderstorms followed by hot, dry weather
Fast-moving, strong thunderstorms followed by warm, humid weather
No precipitation but a sudden change from cool weather to warm weather
Which of the following would cause a hurricane to weaken?
Moving over warm ocean water
Quickly moving through the Gulf of Mexico
Moving overland
Heavy precipitation
Which type of interaction exists between shrimp and blue crabs in this food web?
Shrimp prey on blue crabs.
Shrimp compete with blue crabs for food.
Shrimp help blue crabs filter polluted water.
Shrimp decompose matter for blue crabs.
In this food web, which organism has the greatest number of food sources?
Snake
Hawk
Shrew
Mouse
Which of the following is a chemical change that takes place in the digestive system?
Undigested material is expelled from the body.
Water is separated from solids.
Starches are broken down into sugars.
Sugar is dissolved and absorbed into the bloodstream.
The elements fluorine, chlorine, bromine, and iodine are all found in the same group (17) on the table. These elements are grouped together because they –
are metals
have the same atomic mass
Have the same number of valence electrons
Have the same number of electron shells
Which characteristic of motion could change without changing the velocity of an object?
The speed
The position
The direction
The acceleration
Which example best describes Newton’s third law of motion?
When a glass slid across a table, it spilled water when it stopped suddenly.
An engine used less work to move a lighter car than when it moved a heavier car.
When a passenger stepped from a boat to the shore, the boat moved away from the shore.
A bowling ball rolled in a straight path when it was thrown towards bowling pins.
During which of these phases of the moon would the Earth be experiencing the highest tides?
The picture shows sand used to make a model of a galaxy. In the model, each grain of sand represents…
a comet
a black hole
an asteroid
a star
Rainforest are home to a variety of plant and animal species. Most have yet to be discovered. One study in a Brazilian rainforest found 487 tree species, 320 butterfly species, and over a thousand species of insects on 2.5 acres of land. With so many different species living within a particular region, this can best be described as –
Biodiversity
Species
Niche
Food chain
Which order of succession of natural communities would most likely occur in Texas?
grasses → trees → bushes
trees → bushes → grasses
bushes → grasses → trees
grasses → bushes → trees
Cesium (Cs), is a highly reactive metal. Which elements have a reactivity similar to cesium?
barium (Ba) and radon (Rn)
silver (Ag) and cadmium (Cd)
sodium (Na) and potassium (K)
strontium (Sr) and radium (Ra)
Which element possesses some characteristics of metals and some of the non-metals and can conduct electricity?
A
B
C
D
The three vehicles shown are all traveling at a speed of 15 m/s, but only the pickup truck has a changing velocity. The pickup truck has a changing velocity because the pickup truck --
can accelerate faster than the other two vehicles
is traveling in the opposite direction from the other two vehicles
is traveling on a curve in the road
needs a large amount of force to move
Two cars with different masses travel at the same speed down a hill toward a stop sign. What will happen when both cars apply brakes at the same time to stop?
The car with the smaller mass will require less force to stop than the car with the larger mass.
The car with the larger mass will maintain its velocity while traveling down the hill.
The car with the smaller mass will take longer to stop than the car with the larger mass.
The car with the larger mass will have less inertia than the car with the smaller mass.
What phase will the moon be in when it is in position E?
New Moon
1st Quarter
Full Moon
3rd Quarter
Which type of electromagnetic wave has a wavelength longer than that of yellow light?
Infrared Radiation
UV Rays
X-rays
Gamma Rays
The diagram below shows the beaks of five species of birds that developed over time from one parent species. Which of the following best explains why the beak shape of each species of bird developed differently?
Each beak shape helps the birds to produce different songs.
Each beak shape is an adaptation to a specific source of food.
Each beak shape is designed to construct a different type of nest.
Each beak shape helps protect the birds from a different predator.
The main function of which system is to help protect inner organs from being damaged by an outside force?
Excretory
Nervous
Skeletal
Circulatory
Carbon Dioxide (CO2) and Water (H2O) are used by plants to make food. Which of the following is the correct model for Carbon Dioxide?
C3H8 + 5O2 → 3CO2 + 4H2O
How many different elements are involved in the reaction shown above?
1
2
3
4
A toy train engine rests motionless on a track. One student begins pushing the engine to the right with a force of 2 newtons. At the same time, another student begins pushing the engine to the left with a force of 5 newtons. Which of the following best describes the resulting motion of the engine?
It travels left at a constant speed.
It travels left at an increasing speed.
It travels right at a constant speed.
It travels right at an increasing speed.
At which position does the ball have the greatest kinetic and least potential energy?
1
2
3
4
At which position in earth’s orbit are daytime and nighttime equal?
Position 1
Position 2
Position 3
Position 4
What phase will the moon be in when it is in position B?
Waning Gibbous
Waning Crescent
Waxing Gibbous
Waxing Crescent
Which of the following best summarizes a fundamental concept of the cell theory?
Cells break down complex molecules to produce energy.
Living organisms are composed of one or more cells.
Cells are able to regulate their internal environment.
Living organisms rely on specialized cells to maintain health.
The diagrams represent the way that three different organisms reproduce. Which of these classifies the reproductive method of all the organisms shown above?
Segmentation
Budding
asexual reproduction
sexual reproduction
Which sample equation best illustrates the law of conservation of mass?
12 g reactant X +10 g reactant Y → 2 g product Z
5g reactant E + 5g reactant F → 20g product G + 5g product H
4 g reactant U + 3 g reactant V → 7 g product W
10 g reactant Q + 9 g reactant R → 90 g product S + 90 g product T
A researcher wants to experiment with an element that reacts like phosphorus (P) but has a greater atomic mass. Which element should the researcher select for the experiment?
Nitrogen (N)
Sulfur (S)
Arsenic (As)
Silicon (Si)
A car travels at a constant speed of 15 m/s for 2 minutes. The car increases its speed from 15 to 25 m/s during the next minute and then travels at a constant speed of 25 m/s for 2 more minutes. Which of the following graphs best represents the car’s motion during this 5-minute period?
A student walks 2 km in 30 minutes. What is the students' speed in km/hr?
4 km/hr
8 km/hr
12 km/hr
32 km/hr
Which picture best illustrates the location of the sun in the Milky Way Galaxy?
The early development of the theory of plate tectonics was supported by which of these observations?
matching fossils on the continents of Africa and South America
glacier deposits far from existing continental glaciers
thick sediment layers at the mouths of rivers
the sudden volcanic activity of long-dormant volcanoes
