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WorksheetsPhys/Chem Changes and Reaction Types
Total questions: 16
Worksheet time: 8mins
Which of the following is an indicator of a chemical reaction
A precipitate forms
The substance melts
The substance evaporates
All of the above
What type of reaction is this?
C2H6 + O2 ---> CO2 + H2O
Single replacement
Synthesis
Combustion
Decomposition
You drop red food coloring into a glass of water, and the water turns red. Is this a physical or chemical change?
Chemical, because the water turns red.
Chemical, because you mix two different substances together.
Physical because a new substance isn't forming.
Physical, because the only reason the color looks different is because the food coloring is mixing with the water.
C and D.
Which of the following is a physical change?
Burning a leaf
Boiling water
Rust forming on a bike chain
Fireworks exploding
What type of reaction is this?
Al + HCl ---> AlCl3 + H2
Synthesis
Combustion
Single Replacement
Double Replacement
What kind of reaction is this?
SiCl4 + H2O ---> SiO2 + HCl
Decomposition
Synthesis
Single Replacement
Double Replacement
Select all of the following that are examples of CHEMICAL changes.
Burning a leaf
Freezing nitrogen
Jewelry tarnishing
Combining two substances that produce gas bubbles
Grinding corn into cornmeal
What type of reaction is this?
H2 + O2 ---> H2O2
synthesis
decomposition
combustion
single replacement
What do you change in order to balance equations?
Coefficients
Subscripts
Chemical symbols
What do we know about the mass of the reactants and products of a reaction?
The products have a greater mass than the reactants.
The products mass equals the reactants mass.
The reactants have a greater mass than the products.
What is mass measured in?
Grams (g)
Millliters (mL)
Grams per milliliters (g/mL)
What is volume measured in?
Grams (g)
mL or cm^3 (cubic centimeters)
g/mL
What is the equation for density?
D = Mass / Volume
D = Volume / Mass
D = Volume x Mass
none of the above
What is the density of water?
0.5 g/mL
1.0 g/mL
1.0 cm3
1.4 g/mL
For something to float in water, its density must be ______ that of the water.
Greater than
Less than
In a density column, the least dense substance is at the __________ and the most dense substance is at the _________.
top; bottom
bottom; top
