CHEMICAL CHANGE Self Assessment
Quiz by Angelica Tamang
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- Q1
When silver metal comes in contact with sulfur, silver sulfide forms and the silver appears darker. This is a ______.
chemical change
physical change
change of form
change of state
60s - Q2
A student mixed two clear liquids together. After a few minutes, a white powdery solid was seen and settled at the bottom of the test tube. What conclusion can be made based on the observations cited above?
The liquids have been stored too long and no longer good.
The liquids are toxic and should be handled with caution.
The liquids have gone through a chemical change in which a precipitate was formed.
The liquids were pure substances before they were mixed.
60s - Q3
In the chemical reaction CH4 + 2O2 → CO2+ 2H2O, there are reactants on the left of the equation and products on the right. If you count the atoms in the reactants, there are
4 carbon atoms, 4 hydrogen atoms, and 2 oxygen atoms
4 carbon atoms, 4 hydrogen atoms, and 4 oxygen atoms
1 carbon atom, 4 hydrogen atoms, and 4 oxygen atoms
1 carbon atom, 4 hydrogen atoms, and 2 oxygen atoms
60s - Q4
What happens to the particles of a substance after undergoing a chemical change?
Bonds between particles of the substances are broken.
Energy is absorbed or released by the particles.
New bonds are formed between particles of the substances.
All of the above
60s - Q5
What happens to the particles of a substance after undergoing a chemical change?
Bonds between particles of the substances are broken.
Energy is absorbed or released by the particles.
All of the above
New bonds are formed between particles of the substances.
60s - Q6
A solid brown metal is added to a clear acidic solution. A white powder appears and the acid solution becomes cloudy. Which type(s) of change have/has occurred?
only physical
both chemical and physical
only chemical
neither chemical nor physical
60s - Q7
Chewing food to break it down into smaller particles represents a _________ change, but the changing of starch into sugars by enzymes in the digestive system represents a ___________change.
chemical, chemical
chemical, physical
physical, physical
physical, chemical
60s - Q8
Which of the following is NOT an example of chemical change?
Smoke produced when acid mixed with iron
Bread dough rises when yeast is added
A copper wire is bent
Charcoal burn in a grill
60s