Which example describes a chemical change that occurs during the digestion of food?

• Saliva breaking down the starch in potatoes into simpler sugars

• Teeth grinding cookie into smaller pieces

• Esophagus moving food particles from the mouth to the stomach

• Large intestine absorbing water from waste to be removed from the body

Based on information provided in the periodic table, which statement correctly describes the reactivity of elements?

• Silicon is more reactive than aluminum and has properties similar to phosphorus

• Calcium is more reactive than arsenic and has properties similar to radium

• Xenon is nonreactive and has properties similar to iodine

• Cesium is nonreactive and has properties similar to francium

A scientist determines an unknown metallic sample to have 77 protons and 77 electrons with a mass number of 192. How many neutrons does one metal atom contain?

• 115

• 154

• 346

• 77

How many oxygen atoms are in the following chemical formula? Al₂(CO₃)₃

• 3

• 6

• 9

• 18

Tags

NGSS.MS-PS1-1

A science teacher states if two ice skaters with approximately the same mass push against one another with the same force, they will move away from one another at the same speed and same distance. What scientific evidence supports the teacher as correct?

• Newton's first law of motion

• Newton's second law of motion

• Newton's third law of motion

• Newton's fourth law of motion

Tags

NGSS.MS-PS2-1

What type of energy transformation is taking place in the flashlight?

• Light energy to thermal energy to chemical energy

• Light energy to chemical energy to thermal energy

• Chemical energy to electrical energy to light energy

• Chemical energy to light energy to electrical energy

Tags

NGSS.MS-PS3-4

NGSS.MS-PS3-5

A student rides her scooter. The student has a mass of 40.0 kg and travels with constant acceleration of 1.5 m/s². What net force is the student experiencing?

• 26.7 N

• 0.0375 N

• 60.0 N

• 41.5 N

Tags

NGSS.MS-PS2-2

• Airplane W has a greater kinetic energy than Airplane X. 
• The two airplanes have the same gravitational potential energy but different kinetic energies. 
• Airplane X has more gravitational potential energy than Airplane W. 
• The two airplanes have the same kinetic energy but different gravitational potential energies.

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-2

• 0.2 m/s 
• 0.5 m/s
• 5.0 m/s 
• 10.0 m/s 

Tags

NGSS.MS-PS3-1

• The toy train speeds up while going forward and then slows down. 
• The toy train slows down while going forward and then moves backward. 
• The toy train moves forward at a constant speed, slows down, and then stops. 
• The toy train moves forward at an increasing speed, stops, and then moves forward. 

Tags

NGSS.MS-PS2-2

NGSS.MS-PS3-1