Particles of Matter Review

What are the parts of atoms? Match the following to their definitions.

• Electron

• The particle of atoms that carries a negative (-) charge

• Neutron

• • The particle of atoms that does not carry a charge

• Nucleus

• The dense central core of an atom

• Proton

• • The particle of atoms that carries a positive (+) charge

Tags

NGSS.MS-PS1-1

A scientist proposes that a sheet of aluminum be divided into smaller and smaller pieces.

What occurs during this process?

Select the words from the drop-down menus to correctly complete the explanation.

Eventually, the process produces an aluminum​ (a)   . This is the smallest piece of the aluminum ​ (b)   . Smaller pieces ​ (c)   the properties of aluminum.

• atom
• element
• will not have

Tags

NGSS.MS-PS1-1

A spoonful of salt is mixed into a pitcher of water. Soon, the salt crystals are no longer visible in the water.

Why did the salt disappear?

• Salt crystals separated, and the parts spread evenly among water molecules.

  
  

• Salt and water combined chemically to form a new substance.

  
  

• Salt crystals separated to form new water molecules.

  
  

• Water molecules surrounded the salt crystals, which remained the same size.

  
  

Tags

NGSS.MS-PS1-2

After a rainstorm, a puddle on the sidewalk gradually shrinks in the sunlight. Eventually, the sidewalk is completely dry.

How is the drying of a puddle explained at the level of water molecules?

Water molecules are held loosely together in the ​ (a)   state. When molecules at the​ (b)   gain enough ​ (c)   , they break free of their ​ (d)   for one another. The molecules enter the air as ​ (e)   , a gas.

• liquid
• surface
• energy
• attraction
• water vapor

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

A sealed balloon is heated with a hair dryer. The balloon expands slightly, and then bursts.

Which statement best explains the changes to the balloon?

• When gas particles gain energy, they move faster and exert greater pressure.

  
  

• When gas particles gain energy, each becomes larger and exerts greater pressure.

  
  

• An increase in temperature causes gas particles to chemically combine with one another.

  
  

• An increase in temperature causes gas particles to chemically combine with the material of a balloon.

  
  

Tags

NGSS.MS-PS1-4

Which statement about air is true?

• Air is made of individual atoms and molecules that move separately from one another.

  
  

• Air is made of atoms that have broken apart into protons, neutrons, and electrons.

  
  

• Air does not have mass, so it is not an example of matter.

  
  

• Although air has mass and takes up space, it lacks all other properties of matter.

  
  

Tags

NGSS.MS-PS1-1

Organize these options into the right categories

Groups:

(a) Solid

,

(b) Liquid

,

(c) Gas

• made of particles that vibrate in place

• has a definite shape and volume

• made of particles that move independently of one another

• has definite volume but take on shape of its container

• made of particles that move from place to place but stay in contact with one another

• takes on shape and volume of its container

What does the clear color of the water droplets help explain about the water cycle?

• why rain water is not salty, even when it forms over the ocean

  
  

• why clouds typically form at certain heights above the land and ocean

  
  

• how a raindrop changes size and shape as it falls

  
  

• how a rainbow forms after a rain storm

  
  

Tags

NGSS.MS-ESS2-4

What evidence supports the conclusion that matter is made of small particles?

Select the words from the drop-down menus that correctly complete the paragraph.

Water and sugar will mix together to form a ​ (a)   . The sugar particles gradually disappear because they separate into ​ (b)   that are too small to be seen. The sugar particles may form again if the solution is ​ (c)   .

• solution
• molecules
• boiled

Tags

NGSS.MS-PS1-1