Science STAAR Review 8th grade (24 questions)

(8.5B) An atom of which element is represented by this model?

• Boron (B)
• Carbon (C)
• Neon (Ne)
• Sodium (Na)

Tags

NGSS.MS-PS1-1

(8.5C) A student is studying the ways different elements are similar to one another. Diagrams of atoms from four different elements are shown below.
Which two atoms are of elements in the same group in the periodic table?

• Atom 1 and Atom 2
• Atom 1 and Atom 4
• Atom 2 and Atom 3
• Atom 3 and Atom 4

Tags

NGSS.MS-PS1-1

(8.5E) The scientist spilled a few drops of dilute hydrochloric acid (HCl) on a lab table. For safety purposes, the scientist sprinkled some baking soda (NaCO₃) onto the spill. Which observation would provide the best evidence that a chemical reaction occurred?

• The baking soda and hydrochloric acid combined, and bubbles formed.
• The baking soda absorbed the hydrochloric acid.
• Some of the baking soda dissolved in the hydrochloric acid.
• The hydrochloric acid evaporated, leaving only the baking soda.

Tags

NGSS.MS-PS1-2

(7.6B) Many processes occur in the digestive system. Which process is best classified as a physical change? 

• Saliva converting starch molecules in crackers to simple sugars
• Digestive enzymes breaking down proteins into smaller fragments
• Bacteria converting lactose into simple sugars in the intestines
• Teeth grinding an almond into smaller pieces in the mouth

(8.5A) Which of the following best describes an electron?

• It has no charge and about the same mass as a proton
• It has a negative charge and much less mass than a proton
• It has a positive charge and much more mass than a neutron
• It has a negative charge and about the same mass as a neutron

Tags

NGSS.MS-PS2-3

___________ is the SI(Standard) unit for force.

• Force
• Newton
• Kilogram
• Joule

_________ is an objects tendency to resist changes in motion (ex. speeding up, slowing down, stopping)

• Force
• Inertia
• Friction
• Newton

Which of Newton's laws states that the net force on an object is equal to the objects mass multiplied by its acceleration and it takes more force to move more mass?

• Law of Inertia
• Law of Force and Acceleration
• Law of Action-Reaction
• Law of Movement

Tags

NGSS.MS-PS2-2

Which of the following statements best describes the movement based on the graph.

• A runner that is accelerating by speeding up.
• A car that is parked
• A car slowing down at a stop sign
• A runner running at a constant speed.

Tags

NGSS.MS-PS3-1

What is the speed of a car if it travels 53 meters in 4 seconds?

• 49 m/s
• 212 m/s
• 13.25 m/s
• 53.4 m/s

Tags

NGSS.MS-PS3-1