7th Mid-term SG #1

Use the information and your knowledge of science to answer the question.

Students conducted an experiment in which sugar was added to separate beakers of water and sulfuric acid. Once the sugar was added, the students recorded their observations:

• Beaker #1 (sugar and water): no color change, no solid forms, solid sugar dissolves, no bubbles

• Beaker #2 (sugar and sulfuric acid): color change, solid forms, bubbles form, gas given off.

• In which beaker or beakers did a chemical reaction most likely occur?

• Beaker #2

• Beaker #1

• Both Beaker #1 and Beaker #2

• Neither Beaker #1 nor Beaker #2

Tags

NGSS.MS-PS1-2

Which of the following explains the changes correctly when room temperature soda cans are placed in a cooler?

• The coldness is leaving the soda and going into the ice.

• The heat is leaving the ice and going into the soda.

• The heat is leaving the soda and going into the ice.

• The coldness is leaving the ice and going into the soda.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-3

NGSS.MS-PS3-4

In an ice chest, which way is thermal energy is moving.

• From the soft drink to the ice cubes

• From the ice cubes to the soft drink

• No thermal energy flow

• Both ways

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-3

NGSS.MS-PS3-4

Choose the evidences of a chemical change.

• Bubbles were created, and the bag expanded.

• The bag did not feel hotter or colder.

• There was no longer a strong smell.

• None of the above

Tags

NGSS.MS-PS1-2

Which statement best explains the type of change that occurred as the logs of wood burned?

• A chemical change occurred because the atoms in the wood reacted with oxygen and rearranged to form new combinations of atoms and molecules.

• A physical change occurred because the ash and gas produced can easily be turned back into wood.

• A chemical change occurred because a chemical reaction occurs any time heat is added to a substance.

• A physical change occurred because the atoms in the wood changed from a solid state to a gaseous state as the atoms in the wood burned.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

In which state are the molecules moving the fastest?

• solid

• liquid

• liquid & gas

• gas

Tags

NGSS.MS-PS1-4

Which of the following is the correct relationship between energy, sun, and the air?

• Energy is transferred from the sun directly to the air.

• Energy is transferred from the sun to Earth’s surface.

• Energy is transferred from the sun to the air, and then to Earth’s surface.

• Energy is transferred from the sun to the Earth’s surface, and then to the air.

Tags

NGSS.MS-ESS2-6

What is a water cycle?

• Movement of water in oceans

• Process of water turning into gas

• Formation and movement of clouds

• Continuous movement of water on above and below the surface of the Earth

Tags

NGSS.MS-ESS2-4

The teacher asks the students if it’s possible for the molecules in her demonstration to

eventually stop moving. Which of the following student responses is the most accurate?

• Molecules can stop moving once the temperature change has resulted in a solid becoming a

  liquid.

  
  

• Molecules can stop moving once the temperature has reached the coldest temperature

  possible.

  
  

• Molecules will never stop moving because the temperature is always varied from one phase

  to the next.

  
  

• Molecules will never stop moving because the temperature remains the same through the

  phases.

  
  

Tags

NGSS.MS-PS1-4

Which has the least thermal energy?

• 
• 
• 

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4