Physical and Chemical Properties and Changes

 Which of the following does not conduct electricity easily?

• copper
• plastic
• silver
• salt water

Most __________ conduct electricity very well.

• types of glass
• plastics
• metals
• types of rubber

Bromothymol Blue is a liquid indicator that changes color from blue to green when carbon dioxide gas is mixed into the solution.  When carbon dioxide leaves the solution, the color of the indicator changes from green to blue.
This color change is an example of a(n)

• chemical change
• physical change
• endothermic change
• irreversible change

When iron fillings are mixed with sand, the iron can be removed using a magnet.  This is evidence that the change that occured when the two were mixed was

• physical
• chemical
• irreversible
• molecular

A physical condition known as the melting/freezing point is the point at which _______________.

• a solid material melts
• a liquid material boils
• a liquid material freezes
• Both A and C

Students are studying how two substances react.  The students mix substance 1 with substance 2 in a solution.  Later the students boil the solution, releasing substance 1 as a gas and leaving substance 2 as a solid.  
This is evidence that a(n)

• irreversible state change occurred
• exothermic change occurred
• chemical change occurred
• physical change occurred

Tags

NGSS.MS-PS1-2

Which of the following is NOT the result of a chemical change?

• spoiled milk
• rusted metal
• ground flour
• digested food

Tags

NGSS.MS-PS1-2

Scientists are studying how substance A and substance B react.  When substance A and B are mixed, a substance different from A and B floats to the top of the solution.  This is evidence that a(n)

• reversible state change occurred
• endothermic change occurred
• chemical change occurred
• physical change occurred

Tags

NGSS.MS-PS1-2

H2O (g) --> H2O (l)
The chemical equation above describes a(n)

• chemical change
  chemical change
• physical change
• irreversible state change
• endothermic change

Changes to a substance that do not involve a permanent reordering of atoms are know as 

• irreversible changes
• exothermic changes
• chemical changes
• physical changes

Tags

NGSS.MS-PS1-4