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STAAR FORMATIVE Science 8th Grad

Last updated 3 months ago

25 Nsɛmmisa

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1.

Which element has 12 protons?

Carbon (C)

Chromium (Cr)

Magnesium (Mg)

Zinc (Zn)

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3.

Based on the diagram, which hemisphere is experiencing Summer?

Northern Hemisphere, Earth positioned on the left.

Southern Hemisphere, Earth positioned on the left.

Northern Hemisphere, Earth positioned on the right.

Southern Hemisphere, Earth positioned on the right.

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6.

The diagram shows different types of tectonic plate boundaries.
Which table accurately shows the surface features associated with each tectonic plate boundary?

Plate Boundary: 1 Surface Features: Volcanoes and oceanic ridges Plate Boundary: 2 Surface Features: Trenches and continental rift valleys

Plate Boundary: 1 Surface Features: Oceanic ridges and continental rift valleys Plate Boundary: 2 Surface Features: Trenches and volcanoes

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9.

A neutral atom has an atomic mass of 16 amu. Which particles make up most of the mass of this atom?

Protons and electrons

Protons and neutrons

Neutrons and electrons

Electrons only

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12.

Which statement best compares the atoms of two elements that have similar chemical properties because they are in the same Group?

The atoms of both elements have the same number of neutrons.

The atoms of both elements have the same number of valence electrons.

The atoms of both elements have an equal number of energy levels.

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15.

Ocean water absorbs carbon dioxide from the atmosphere. Carbon dioxide lowers the pH of the ocean water, making acidic which is harmful to organisms living in the ocean.
Which activity is most likely to decrease the amount of carbon dioxide being added to the ocean water?

Cutting down rain forests to use the land to farm crops

Constructing homes on farmland rather than on vacant lots in cities

Going to school in cars instead of riding the bus with other students

Using electrically powered devices instead of those powered by fossil fuels

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18.

What are the charge and location of each subatomic particle of an atom? Protons:

Electrons:

Burning wood

Breaking an egg

Cooking an egg

Freezing a popsicle

Rusting iron

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21.

Carts of different masses are pulled along a flat surface. Which two carts experience the same net force? JUST CALCULATE NET FORCE!!!!!!!!!!!!

Carts 1 and 2

Carts 1 and 3

Carts 2 and 3

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23.

Which SAMPLES are metals? CHOOSE 3 CORRECT ANSWERS

Sample 1

Sample 2

Sample 3

Sample 4

Sample 5

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2.

The image shows a roller coaster cart moving along a track. 📷
Which statement best describes the kinetic and potential energies of the cart at Location X compared with the kinetic and potential energies of the cart at Location Y?

The cart has more potential energy and less kinetic energy at Location X than it has at Location Y.

The cart has less potential energy and more kinetic energy at Location X than it has at Location Y.

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4.

An equation for a chemical reaction is shown:
NaOH+HCl→NaCl+H₂O
Which statement provides evidence that mass is conserved in this chemical equation/reaction?

Two new substances are formed in the products.

Water is one of the products, but not one of the reactants.

Two hydrogen atoms are in the reactants, and two hydrogen atoms are in the products.

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5.

Which statement best compares the properties of silicon (Si) and nickel (Ni)?

Silicon is brittle, while nickel is malleable.

Silicon is ductile, while nickel is not ductile.

Silicon is a good conductor of electricity, while nickel is not.

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7.

A graph of an object’s motion during a 5-second time interval is shown.
Which statement correctly compares the object’s motion during the first 3 seconds and the last 2 seconds?

Both the speed and velocity change.

Both the speed and velocity stay the same.

The speed changes, but the velocity stays the same.

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8.

The chemical formula for methane is
CH₄
Which statement would describe the number of atoms present if there were 4 molecules of this compound? HINT: Use a COEFFICIENT in front of compound.

Four molecules of methane would contain 1 atom of carbon and 4 atoms of hydrogen.

Four molecules of methane would contain 4 atoms of carbon and 1 atom of hydrogen.

Four molecules of methane would contain 4 atoms of carbon and 16 atoms of hydrogen.

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10.

An energy pyramid is shown. 📷 Which statement best describes the flow of energy through this pyramid?

Producers don't provide energy directly to the organisms in the trophic levels above them.

Primary consumers transfer energy to the trophic level above them and the trophic level below them.

Tertiary consumers do not receive all the energy from the trophic level below them, because some energy is lost to the environment.

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11.

The mass, applied force, and frictional force for four carts are shown:
PART A) Based on the data table, which cart has the lowest acceleration?
PART B) Which best explains the correct answer to Part A?

W

X

The cart will have the lowest acceleration if it has a larger mass and with greatest amount of force.

The cart will have the lowest acceleration if it has a smaller mass and with greatest amount of force.

The cart will have the lowest acceleration if it has a larger mass and has the least difference between its applied force and friction.

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13.

A student is pushing two blocks on a smooth, frictionless surface.
What force is required in order to produce an acceleration of 2.5 m/s²on the two blocks combined mass shown?

12 N

30 N

50 N

75 N

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14.

This question has two parts. A student lists two land features:
Himalayas (mountain range)
(East African) Great Rift Valley
A) Which statement describes how each land feature most likely formed?
B) Which best explains Part A?
CHOOSE the TWO correct answers.

The Himalayas formed at convergent boundaries, while the Great Rift Valley formed at divergent boundaries.

The Himalayas and the Great Rift Valley both formed at divergent boundaries.

Tectonic plates are moving toward each other in areas that form mountains, while tectonic plates are sliding past each other in areas that form rift valleys.

Tectonic plates are moving toward each other in areas that form mountains, while tectonic plates are moving away from each other in areas that form rift valleys.

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16.

Which statement correctly describes characteristics of organisms in a particular kingdom?

Unicellular, heterotrophic organisms that have a nucleus are members of Kingdom Bacteria.

Unicellular, autotrophic organisms that do not have a nucleus are members of Kingdom Fungi.

Multicellular, heterotrophic organisms that have a nucleus are members of Kingdom Animalia.

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17.

Which graph represents a baseball player accelerating away from a base located at the origin?

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20.

The table shows the motion data for two objects during two trials of an investigation.
Which object travels at the greater average speed?

Object 1, because it travels the greater distance per unit of time

Object 1, because it travels the longer amount of time

Object 2, because it travels the shorter amount of time

Object 2, because it travels the shorter distance per unit of time

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22.

Which best describes the cell shown?

Plant Cell with labelled mitochondria "power house' and vacuoles that store water and waste.

Animal Cell with labelled mitochondria "power house' and chloroplast.

Animal Cell with labelled mitochondria "power house' and vacuoles that store water and waste.

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24.

Certain species of yeast can reproduce sexually or asexually. Which answer choice best compares the offspring from sexual reproduction to the offspring from asexual reproduction?

Offspring of sexual reproduction are larger than offspring of asexual reproduction.

Offspring of sexual reproduction are genetically different from either parent and offspring of asexual reproduction are identical to the parent.

Offspring of sexual reproduction have twice as much genetic material as the offspring of asexual reproduction.

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25.

A chemical equation for the reaction between calcium hydroxide, Ca(OH)₂, and sulfuric acid, H₂SO₄, is shown.
The Law of Conservation of Mass state the amount of mass in the reactants should equal the amount of mass in the products. How many grams of sulfuric acid, H₂SO₄ were used in the reaction?

62 g

98 g

36 g