7th_Term 2 Test Review

Which of the following is true about how hydrogen and oxygen can combine to form molecules?

• Hydrogen and oxygen can combine in many ways to form different molecules.

• Two atoms of hydrogen are always required to bond with two atoms of oxygen.

• When oxygen combines with hydrogen to make a molecule, water will always be produced.

• Molecules composed of hydrogen and oxygen must have at least four atoms.

Tags

NGSS.MS-PS1-1

Which of the following best explains the relationship between molecules and atoms?

• Atoms are molecules that have a charge.
  

• Atoms have smaller parts, called molecules.
  

• Molecules are made up of two or more atoms.
  

• Molecules are atoms that have no mass.
  

Tags

NGSS.MS-PS1-1

​​​​​​​The extended structure of sodium chloride (NaCl) is shown.

​​​​​​​Which of the following describes the configuration of Layer 4 of the sodium chlorie crystal?

• It will be identifcal in all of its characteristics to Layer 1.

• It will contain 4 atoms of chlorine and 5 atoms of sodium.

• It will have chlorine atoms in all four of its corners.

• have sodium that are bonded only to other sodium atoms.

Tags

NGSS.MS-PS1-1

Students are asked to create models of molecules using marbles of different colors to represent atoms of different types. Look at the table describing the models made by four students. Which of the following is the most accurate evaluation of these models?

• Only Students 1, 2, and 4 created acceptable models, since molecules must be made of different types of atoms.
  

   

• All student models are acceptable except that of Student 4, since molecules can't be made of so high a number of atoms.

• ​​​​​​​Only Student 2 created an acceptable model of a molecule, since every molecule must have a balance of atoms.
  

   

• ​​​​​​​All of the students created acceptable models because molecules can consist of many different configurations of atoms.
  

   

Tags

NGSS.MS-PS1-1

Atomic models of graphite and diamond are shown.

Graphite is a soft, dark material often used as a lubricant. Diamond is often a clear, hard crystal. Which of the following best explains the difference in these materials?

• ​​​​​​​The elements of which each one is made.
  

   

• The number of atoms each one is made of.
  

   

• ​​​​​​​The arrangement of the atoms of each one.
  

   

• The size and shape of the individual atoms.
  

Tags

NGSS.MS-PS1-1

The following model was used to show a molecule of methane, or CH₄. In each methane molecule, there are ​ ​ ​ (a)   hydrogen atoms and ​ (b)   carbon atom.

• four
• one
• five
• eight

Tags

NGSS.MS-PS1-1

Match the following

• Substance

• Solid material whose atoms are arranged in an ordered pattern

• Crystal

• Matter with consistent properties throughout

• Molecule

• The smallest unit of a compound

• Atom

• The basic building block of matter; made of electron(s), proton(s), and neutron(s)

• Matter

• Anything with both volume and mass

Tags

NGSS.MS-PS1-1

Which of the following changes made to a sample of liquid would result in an increase in the distance between the individual molecules of the substance?

• ​​​​​​​Adding heat energy to the substance
  

   

• Changing the phase of matter from liquid to solid

• Transferring the substance to a smaller container

• ​​​​​​​Decreasing the overall kinetic energy of the liquid

Tags

NGSS.MS-PS1-4

A student drew a representation of the atoms of a solid. The illustration shows closely packed atoms vibrating, but remaining in the same relative positions.

Which of the following changes must the student make to the illustration to accurately represent the same substance in the liquid phase?

• The illustration should show increased movement of the atoms.

• Each individual atom should be larger.

• There should be very wide spaces between the atoms.

• The shape of each atom must reflect the shape of the container.

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-4

As thermal energy is added to a substance, which of the following changes can be predicted?

 

• Temperature of the substance will decrease.
  

   

• Vibration of the individual particles will increase.
  

   

• Spacing between particles will decrease.
  

   

• The pressure of the air around the substance will increase.
  

   

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4