8th grade in review

All living things require oxygen to survive. Where on the periodic table above would you find gases like oxygen? 

• section A 
• section B 
• section C 
• section D 

Tags

NGSS.MS-PS1-4

Felipe is observing how acetic acid (vinegar) and sodium bicarbonate (baking soda) react with one another in a volcano model. What evidence can Felipe look for to indicate a chemical reaction has taken place? 

• The volume of the acetic acid increases. 
• The density of the baking soda decreases. 
• Gas bubbles are produced.
  
• The baking soda is dissolved. 

Tags

NGSS.MS-PS1-2

Describe the movement of the box in between the two trucks pulling on it. 

• It moves to the left at an increasing speed. 
• It moves to the right at an increasing speed. 
• It moves to the left at a constant speed.
  
• It moves to the right at a constant speed. 

Which of the following scenarios is an example of an unbalanced force? 

• a car traveling constantly at 50 mph 
• a golf ball being hit with a club
  
• a big truck stopped at a red light
  
• a satellite orbiting the earth 

Tags

NGSS.MS-PS2-2

Samuel kicks a soccer ball across a grassy field and it eventually comes to a stop. If Newton’s law of inertia is true, why did the ball stop? 

• Newton’s law only applies to objects at rest. 
• The mass of the ball is not great enough to have inertia. 
• Friction with the grass applies a net force on the ball causing it to decrease its speed. 
• Gravity slowed the ball until it came to a stop. 

Use this model of the Hertzsprung-Russell diagram to answer question. 
An astronomer discovers a new star that is very hot, but not very bright. What type of star did she discover? 

• a red giant
  
• a young star on the main sequence 
• an old star on the main sequence 
• a white dwarf 

What phase of the moon will you see in this situation? 

• A
• B
• C
• D

Tags

NGSS.MS-ESS1-1

What is the mass number of the atom shown in the Bohr model?

• 11

• 12

• 23

• Can't be determined

Tags

NGSS.MS-PS1-1

Acceleration of an object happens when things ________

• slow down
• go faster
• change direction (turn)
• All of the above

Tags

NGSS.MS-PS2-2

At position A, which hemisphere would have summer?

• Northern hemisphere
• Southern hemisphere
• Neither hemisphere

Tags

NGSS.MS-ESS1-1

NGSS.MS-ESS2-6