1st 9 Weeks Exam Review

Which property of a strip of copper wire is an example of an extensive physical property?

• ductility

• density

• length of the strip

• thermal conductivity

Which of these is an extensive property?

• mass

• boiling point

• temperature

• density

The motion of atoms is affected by temperature. The pictures show water at three different temperatures. Rank the three images in order of decreasing motion of water molecules. (1 = most motion, 3 = least motion)

• Image A

• Image C

• Image B

A student is given a solid compound in a beaker. Which of the following is the BEST way to describe this solid compound?

• definite shape, indefinite volume

• indefinite shape, indefinite volume

• definite shape, definite volume

• indefinite shape, definite volume

Matter can be classified by its physical state. Select the physical state described below. - This physical state of matter does not take the shape of its container. - If heat is added, this physical state changes to a liquid. - The molecules in this state of matter are vibrating in place.

• a

• b

• c

Tags

NGSS.MS-PS1-4

What are the charges of the following subatomic particles? a. neutron ​ (a)   b. electron ​ (b)   c. proton​ ​ (c)  

• neutral
• negative
• positive

_{How many protons does Helium have?}

• 4
• 4.0026
• 2
• 1

Tags

NGSS.MS-PS1-1

A student mixed some yellow sulfur powder with some iron filings. She was able to take the iron out of the sulfur by using a magnet. She then remixed the iron and sulfur in a test tube and heated it. After it cooled, she removed the substance from the test tube but could not separate the iron from the sulfur using the magnet. Which type of change occurred in the material when it was heated?

• a physical change because the iron reacted with the sulfur

• a chemical change because a new substance was formed

• a physical change because a compound was formed

• a chemical change because a magnet had to be used

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4

Indicate each of these properties as being intensive or extensive.

temperature: ​ (a)  

volume: ​ (b)  

hardness: ​ (c)  

density: ​ (d)  

length: ​ (e)  

• intensive
• extensive

During which step of this procedure does a chemical change occur?

• Step 1: Mixing the substances

• Step 2: Heating the mixture

• Step 3: Observing the color change

• Step 4: Cooling the mixture

Tags

NGSS.MS-PS1-2