STAAR Science Review

A large rock is motionless on a flat sidewalk. Which statement best explains why the rock remains motionless?

• F There are no forces acting on the rock.

• G The only force acting on the rock is directed toward the sidewalk.

• H The forces acting on the rock are all balanced.

• J The sidealk exerts an unbalanced force ont the rock.

A pitcher throwas a ball toward a player holding a softball bat. The player uses the bat to hit the ball. The bat applies a 10-newton force to the ball. Which statement correctly describes the reaction force to the ball?

• The reaction force is the force that causes the bat to move toward the bat.

• The reaction force is the force appliked to the bat by the player h9oling the bat.

• The reaction force is the force that pulls the ball toward the ground.

• The reaction force is the force of the ball on the bat.

Tags

NGSS.MS-PS2-1

(8.5C 2019 – Q13)

• Group 2

• Group 8

• Group 12

• Group 18

How many valence electrons aarre in an atom of each element in Group 15 in the periodic table? (Record your answer using the correct place value.)

Which pair of properties describes the elements in Group 18?

• They are chemically stable and liquid at room temperature.

• They have eight balence electrons and are flammable.

• They are maganetic and boil at low temeperatures.

• They are gaseous and room temperature and chemically stable.

(8.5D 2019-Q17)

• A

• B

• C

• D

Tags

NGSS.MS-PS1-1

(8.5D 2019-Q32)

• 1

• 2

• 4

• 5

Tags

NGSS.MS-PS1-1

(8.5D 2017Q-13)

• A

• B

• C

• D

Tags

NGSS.HS-LS1-6

(8.7B 2017-Q31)

• A

• B

• C

• D

Tags

NGSS.MS-ESS1-1

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