STAAR Review Science

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

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

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

The diagram below shows four positions in Earth's orbit around the sun. 
The Northern Hemisphere experiences the beginning of spring when Earth is in-

• Position 1

• Position 2

• Position 3

• Position 4

Tags

NGSS.MS-ESS1-1

Which of these locations on Earth experiences the least change in the number of daylight hours throughout the year?

• Equator

• North Pole

• Tropic of Cancer

• Tropic of Capricorn

Tags

NGSS.MS-ESS1-1

The diagram below shows a model of the movement of two tectonic plates. When the plates collide, one plate often moves below the other plate.
The rising magma that can result from this type of plate movement may produce-

• fossil layers

• volcanic islands

• deep-sea sediment

• seafloor spreading

Tags

NGSS.MS-ESS2-2

The points labeled W and Y on the topographic map below show the campsites of two families. Each family hiked to the elevation on the map marked X. The arrows show the paths taken by both families.
What was the change in elevation, to the nearest ten meters, for the family that took the steepest path to Point X?

• 10

• 20

• 60

• 120

___________ 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