Physical Properties
What physical property describes how much space an object takes up?
Volume
Is flammability a physical or chemical property?
Chemical
Is melting ice a physical or chemical change?
Physical
Is burning paper a physical or chemical change?
Chemical
What is density?
The amount of mass in a given volume
Which physical property explains why iron sinks in water but wood floats?
Density
What chemical property describes a substance’s ability to react with oxygen?
Rusting/oxidation
What happens to the substance during a physical change?
Its form changes, but it stays the same substance
What is the main difference between a physical and chemical change?
Chemical change forms a new substance
What two measurements are needed to calculate density?
Mass and volume
Name two physical properties you could observe without changing the substance.
Why can chemical properties only be observed when a substance changes?
They describe how a substance reacts to form new substances
Name two examples of physical changes.
Cutting, melting, freezing, boiling, etc.
Why is rusting considered a chemical change?
A new substance (iron oxide) forms
Write the formula used to calculate density.
D= m/v
Two objects have the same mass but different volumes. Which one has the greater density?
The object with the smaller volume.
If a substance reacts with acid, is that a physical or chemical property? Why?
Chemical property, because it shows how a substance reacts
Why is dissolving sugar in water considered a physical change?
Can chemical changes usually be reversed? Why or why not?
No, because new substances are formed
A rock has a mass of 200 g and a volume of 50 cm³. What is its density?
4 g/cm³
Explain why density is considered a physical property.
It does not depend on the amount of the substance
Why can’t you identify a chemical property just by looking at a substance?
Because chemical properties are only observed when a substance reacts
How can you tell a physical change has occurred without knowing the substance?
Only size, shape, or state changes (a physical, measurable change)
Compare what happens to atoms during a physical change versus a chemical change.
Atoms rearrange in chemical changes but not in physical changes
Two objects have the same volume, but one has a greater density. What can you conclude about their masses, and why?
The object with greater density has greater mass because density equals mass divided by volume