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Assessment-Phys or Chem Changes (Other Teachers)

Online Assessment
Instructions
1) Type in your first and last name in the “Name” box in the top-left corner.
2) Next type in your teacher’s name in the “ID” box.
3) Then type in your school’s name in the “Email” box.
4) Select the best answer for each question.
5) When you are finished click the “Grade and Submit” button.
6) The grade will be emailed to your teacher.
 

 1. 
NOTE: If your teacher’s last name is Elliott, then you are doing the wrong assessment.
---This assessment is only for students of other teachers.
---If your teacher is Mr. Elliott, then please go back to the website and click on the first assessment link instead. Thanks!

If some rain water happens to seep down into a crevice in a rock and it freezes, the volume of the ice will increase and it can crack the rock as it expands. This is an example of weathering. 
mc001-1.jpg
Which of the following statements most accurately describes this type of weathering? 
a.
The rock remained unchanged during this weathering process.
b.
This is a physical change since heat was given off and gas was released.
c.
The rock physically changed as ice expanded inside the crack.
d.
A chemical change occurred as the ice cracked the rock.
 

 2. 
Which statement best describes a physical change?
a.
A process separates water into hydrogen and oxygen.
b.
Wood burning on a camp fire releases gases into the air.
c.
An empty Coke can is crushed flat.
d.
A copper penny exposed to the air forms rust (copper oxide)
 

 3. 
When air is heated, it expands and rises. Hot-air balloon pilots use this phenomena to their advantage. These pilots use a gas-flame blower to increase the temperature of the air inside the balloon making the balloon rise.
Hot Air Balloon
mc003-1.jpg
This description of hot-air balloon operations includes a physical change example and a chemical change example.
Select the choice below that correctly identifies both of these changes.
a.
The heated air is a chemical change. The burning fuel is a physical change.
b.
The balloon rising is a chemical change due to overcoming the force of gravity.
c.
The wind blowing the balloon is a physical change. The flame is a chemical change.
d.
The burning fuel is a chemical change. The heated air is a physical change.
 

 4. 
Which of the following is an example of a physical change but NOT a chemical
change?
a.
A child forgets to put the jug of milk back in the refrigerator, and it turns sour.
b.
A wood log burns on a camp fire.
c.
An old car rusts away out in a grassy field.
d.
A man boils water to make hot tea.
 

 5. 
A group of students observed a glass of water inside a vacuum chamber. The vacuum chamber was attached to a pump that sucked out all of the air from the chamber. When the air was removed, the water began to boil at room temperature.
Vacuum Chamber
mc005-1.jpg
Which of the following statements BEST explains what happened in the scenario described above?
a.
The water underwent a physical change and turned into vapor when air pressure was removed .
b.
Water is naturally liquid and must undergo a chemical change in order to boil at room temperature.
c.
The temperature increased until the water boiled. This is evidence of a chemical change.
d.
When the air was removed, the water molecules could no longer float. Therefore the liquid began to boil.
 

 6. 
During phase changes, the appearance of a substance is changed, but there is no change at the atomic level.
Which of the following is an example of a physical change (a change of phase) but NOT a chemical change?
a.
A tree stores energy from the Sun in its fruit.
b.
A penny lost in the grass slowly changes color.
c.
A water pipe freezes and cracks on a cold night.
d.
A log gives off heat and light as it burns.
 

 7. 
A student in science class combined two liquids. The temperature increased, a foul smell was given off, and a solid substance was formed.
mc007-1.jpg

The student could best classify this reaction as a...?
a.
physical change.
c.
mass change.
b.
weight change.
d.
chemical change.
 

 8. 
A green powder (a solid) and clear water (a liquid) were combined together in a beaker.
After combining these two items, observations were recorded.
Which of the following observations indicates that a chemical change occurred?
a.
The combination turned a green color.
b.
Nothing special was observed. The powder merely sank to the bottom of the liquid.
c.
The powdery substance dissolved into the clear liquid.
d.
A gas was released, a popping noise was heard, and the temperature increased.
 

 9. 

Copper carbonate being heated in a test tube is shown in the diagram below.
mc009-1.jpg
Which statement best describes what happened in this experiment?
a.
Copper oxide decomposed when heated, causing a chemical change.
b.
Copper oxide reacted with the glass wool, causing a physical change.
c.
Copper carbonate reacted with the glass wool, causing a physical change.
d.
Copper carbonate decomposed when heated, causing a chemical change.
 

 10. 
      Two students combined  a solid with a liquid in a container. They observed a flash, and they saw and smelled gas being released. They also noticed that the container grew hot to the touch.
How can they be certain that they observed a chemical change instead of just a physical change.
a.
The saw it flash, felt the temperature increase, and observed gas being released
b.
The can be certain because the liquid changed into a gas (change of state)
c.
The know this was a chemical change because it changed color.
d.
This was definitely a chemical reaction because the solid dissolved in the liquid.
 



 
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