Quiz about 2025 STAAR Prep 8th Science

Question 1

The equation for photosynthesis is shown.

Which statement about the equation BEST identifies evidence that mass is conserved during photosynthesis?

Accepted Answer

The number of atoms for each element in the reactants is equal to the number of atoms for each element in the products.

Answer

The number of molecules in the reactants is equal to the number of molecules in the products.

Answer

The number of molecules in the reactants is equal to the number of carbon atoms in the products.

Answer

The number of the states of matter in the reactants is equal to the number of states of matter in the products.

Question 2

Which statement BEST describes a component of cell theory?

Accepted Answer

All cells come from pre-existing cells.

Answer

All cells from from molecules.

Answer

All cells create genetically identical cells.

Answer

All cells reproduce from simpler cells.

Question 3

Which statement correctly describes one of the two gases?

Accepted Answer

The chemical formula for gas Y is N₂O & is made of nitrogen & oxygen

Answer

The chemical formula for gas X is NO & is made of nitrogen & oxygen

Answer

The chemical formula for gas X is N₂O₂ & is made of neon & osmium

Answer

The chemical formula for gas Y is N₃O₃ & is made of neon & osmium

Question 4

Using the table shown, which table column of information would BEST be used for knowing the chemical formula of NO₂ ?

Accepted Answer

Molecular composition

Answer

Number of atoms per molecule

Answer

Types of elements

Answer

Volume of sample

Question 5

Students measure the mass of two different substances in Test Tubes A and B. Both substances are then added to Test Tube C, and a reaction occurs. The students observe bubbles in the resulting solution. After the reaction is complete, the students measure the mass of the substance in Test Tube C.

Accepted Answer

Less than 35 grams because gases escaped into the atmosphere during the chemical reaction

Answer

Less than 35 grams because gases have less mass than solids

Answer

Exactly 35 grams because mass is conserved when chemical reactions produce gases

Answer

Exactly 35 grams because chemical reactions cause substances to change phases into a gas

Question 6

Which factor contributes MOST to the formation of a hurricane?

Accepted Answer

High water temperatures

Answer

High water density

Answer

High water oxygen levels

Answer

High water volume

Question 7

Many types of plants stand upright when they are healthy and have received plenty of water.

During an extended drought, however, plants often do not have access to enough water. In an arid environment or in an area with frequent droughts, only plants well adapted to the dry conditions will survive long enough to produce seeds. These seeds then sprout and grow into more drought-resistant plants.

Which pair of cell parts are MOST responsible for helping plants stand upright after receiving plenty of water?

Accepted Answer

Cell wall & vacuole

Answer

Nucleus and ribosome

Answer

Vacuole & mitochondria

Answer

Mitochondria & chloroplast

Question 8

Which cell part is most directly involved in the process that allows plants to adapt to drought conditions?

Accepted Answer

Cell nucleus, because it contains information that determines the drought resistant traits passed to next generation

Answer

Cell membrane, because it can become more efficient to create drought resistance

Answer

Cell wall, because it adjusts to holding more water, so the next generation of plants can survive droughts

Answer

Cell vacuole, because it expands to hold more water making future generations more drought resistant

Question 9

A student draws models of Earth and the sun in different positions.

Which drawing should be used to represent summer in the Southern Hemisphere?

Accepted Answer

Question 10

A student draws models of Earth and the sun in different positions.

Which drawings should be used to represent winter in the Southern Hemisphere?

Accepted Answer

Accepted Answer

Question 11

A student draws models of Earth and the sun in different positions.

Which drawings should be used to represent summer in the Northern Hemisphere?

Accepted Answer

Accepted Answer

Question 12

A student draws models of Earth and the sun in different positions.

Which drawing should be used to represent winter in the Northern Hemisphere?

Accepted Answer

Question 13

A teacher adds a colorless solution of potassium iodide to a colorless solution of lead nitrate in a beaker. A yellow solid, precipitate, is observed in the beaker.

Which statement provides the BEST evidence that a chemical reaction occurred and that the law of conservation of mass was observed?

Accepted Answer

A new substance formed, which caused the mass in the beaker did not change

Answer

A new substance formed, which caused the mass in the beaker to be increased

Answer

The two substances were mixed together and the solid increased the mass in the beaker

Answer

The two substances were mixed together and the solid decreased the mass in the beaker

Question 14

A researcher began the following reaction with 52.6 grams of sugar and Sulfiric Acid in part A. The final mass of the products in part B would MOST LIKELY be:

Accepted Answer

Less than 52.6 grams

Answer

More than 52.6 grams

Answer

Exactly 52.6 grams

Answer

Cannot be determined

Question 15

Group 1 uses a balloon to contain gas from a baking soda and vinegar reaction, while Group 2 does not. How would the final mass in Group 2's experiment compare to Group 1's, and why?

Accepted Answer

The final mass in Group 2's experiment will be less than Group 1's, because gas is allowed to escape the flask, decreasing the final mass.

Answer

The final mass in Group 2's experiment will be greater than Group 1's, because gas is allowed to enter the flask from the room, increasing the final mass.

Answer

The final mass in Group 2's experiment will be the same as Group 1's, because mass is always conserved during chemical reactions.

Answer

The final mass in Group 2's experiment will be greater than Group 1's, because mass is always added during chemical reactions.

Question 16

In the picture, which box on the right shows the correct products according to the Law of Conservation of Mass?

Accepted Answer

D

Answer

A

Answer

B

Answer

C

Question 17

A diagram of a convection current is shown.

Which statement correctly describes the changes in the air as it moves from Location R to Location T?

Accepted Answer

The Sun heats the land faster than the ocean water, so high-density air moves from the ocean to the land, becoming less dense.

Answer

The Sun heats the land faster than the ocean water, so high-density air moves from the land to the ocean, becoming less dense.

Answer

The Sun heats the land slower than the ocean water, so high-density air moves from the ocean to the land, becoming less dense.

Answer

The Sun heats the land slower than the ocean water, so high-density air moves from the land to the ocean, becoming less dense.

Question 18

A group of students had two clear solutions, Solution A and Solution B. They poured 30 mL of Solution A and 30 mL of Solution B into a flask, sealed the flask with a stopper, and gently shook it to mix the solutions. The students wrote down their observations and measurements.

-There were 36 g of Solution A and 34 g of Solution B before they were mixed.
-The mass of the empty flask was 300 g.
-The mass of both solutions and the flask was 370 g after the solutions were mixed.
-A precipitate formed when the two solutions were mixed.
-The clear solutions changed to cloudy white after being mixed.

Which statement is evidence that mass was conserved during the chemical reaction?

Accepted Answer

The total mass of both solutions and the flask was 370 grams before and after the solutions were mixed.

Answer

The volume of each solution was 30 mL before the solutions were mixed.

Answer

A precipitate formed when the two solutions were mixed.

Answer

The mass of solution A was greater the mass of solution B before the solutions were mixed.

Question 19

Student 1 claims that whenever the color of a substance changes, a chemical change has occurred.

Student 2 claims that food coloring can change the color of a substance without causing a chemical change.

To test their claims, the students add red food coloring to a glass of water. The students observe that the clear water turns a light pink color. Their teacher then runs a test to show that the pink solution contains both water molecules and food-coloring molecules.

Based on these findings, which student is correct?

Accepted Answer

Student 2, because no new substance was formed when there was a color change

Answer

Student 1, because the food-coloring molecules were found in the pink solution.

Answer

Student 1, because the state of matter changed when the food coloring was added.

Answer

Student 2, because the red food coloring caused the water to change to a pink color.

Question 20

Two students, Carston and Erikk, push on the opposite sides of a crate, with the force applied by each student in newtons (N), as shown in the diagram.

Assuming the crate is on a frictionless surface in Mr. Cooney's room (which is total lie), which direction will these forces push the crate.

Accepted Answer

Erikk is stronger than Carston because he is pushing with more force, Therefore the crate will move to the left.

Answer

It won't move because Erikk & Carston are too weak to push that much mass. Therefore Mr. Cooney will have to move it by himself.

Answer

Carston is stronger than Erikk because he is pushing with more force. Therefore, the crate will move to the right.

Answer

Carston & Erikk are of equal strength and push with equal forces in opposite directions. Therefore the crate will not move.

Question 21

Overfishing reduces the number of fish at a rate that causes long-term reductions in fish populations. The table shows the percentage of fish species in the ocean that were overfished in three different years.

Which action would MOST LIKELY reverse the trend shown in the table?

Accepted Answer

Requiring ships to return non-adult fish to the ocean so that they can grow and reproduce.

Answer

Increasing the total weight of fish that ships can take from the ocean each day.

Answer

Decreasing the number of policing ships so that restrictions and regulations on how much fish are taken are leeseened.

Answer

Promoting meals centered around specific fish species in order to increase profits.

Question 22

An astronomer discovers a star that has a temperature of 3,750 K and a luminosity of 10³ L_sun.

According to the diagram, which type of star did the astronomer discover?

Accepted Answer

Giant

Answer

White dwarf

Answer

Main sequence

Answer

Super Giant

Question 23

An astronomer discovers a star that has a temperature of 3,750 K and a luminosity of 10³ L_sun.

Which statement justifies this selection of star?

Accepted Answer

The star is cool & the brightest compared to other types of stars

Answer

The star is hotter & the brightest compared to other types of stars

Answer

The star is cool & dim compared to other types of stars

Answer

The star is hot & dim compared to other types of stars

Question 24

A tennis ball is dropped down a stairwell.

Which statement BEST describes the energy of the tennis ball?

Accepted Answer

The tennis ball has the most potential energy before it is dropped.

Answer

The tennis ball's kinetic energy decreases as it falls

Answer

The tennis ball has the most kinetic energy as soon as it was dropped.

Answer

The tennis balls' potential energy increses as it falls to the ground.

Question 25

The Olympic Mountains formed along the west coast of the United States at the boundary between the Juan de Fuca Plate and the North American Plate.

Which type of boundary MOST LIKELY exists between the Juan de Fuca Plate and the North American Plate?

Accepted Answer

Convergent boundary, where the plates are moving towards each other.

Answer

Convergent boundary, where the plates are moving parallel to each other.

Answer

Transform boundary, where the plates are moving closer to each other.

Answer

Transform boundary, where the plates are moving passed each other.

Question 26

Figure 2 shows the tectonic plate boundary in this area during the Mesozoic Era, which is when the mountains in the Coast Ranges were formed.

Which statement describes the motion of the tectonic plates in Figure 2?

Accepted Answer

The plates are moving towards each other & the oceanic plate is being pushed underneath the continental plate.

Answer

The plates are both moving in the same direction.

Answer

The plates are moving away from each other & more oceanic plate is emerging from underneath the continental plate.

Answer

The plates are sliding past each other horizontally.

Question 27

Which statement BEST describes the plate boundary?

Accepted Answer

Subduction zone at a convergent boundary

Answer

Subduction zone at a divergent boundary

Answer

Volcanic hot spots at a divergent boundary

Answer

Volcanic hot spots at a convergent boundary

Question 28

A student sets a 0.4 kilogram (kg) soccer ball on the ground and gives it a hard kick. The ball traveled a distance of 37 meters (m). The acceleration of the ball was 2,550 meters per second squared (m/s²).

Based on the data, how much force in newtons (N) did the student apply to the ball?

Accepted Answer

1020.0 N

Answer

14.8 N

Answer

68.9 N

Answer

6375.0 N

2025 STAAR Prep 8th Science

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