Physical vs Chemical
This type of property can be observed without changing what the substance is.
What is a physical property?
This type of property depends on how much matter is present, like mass or volume.
What is an extensive property?
The formula for density.
What is mass divided by volume (D = m/v)?
A substance made of only one type of atom or molecule throughout.
What is a pure substance?
The amount of matter in an object.
What is mass?
Rusting, burning, and reacting with acid are all examples of this type of property.
What is a chemical property?
This type of property does not depend on the amount of matter present, like density or melting point.
What is an intensive property?
A sample has a mass of 20 g and a volume of 4 mL. This is its density.
What is 5 g/mL?
Two or more substances physically combined, like salt water or a salad.
What is a mixture?
The amount of space matter takes up.
What is volume?
This is the term for a change where a new substance is formed, such as wood burning to ash.
What is a chemical change?
Cutting a gold sample in half changes this property, but not its density.
What is mass (or volume)?
A liquid has a density of 0.8 g/mL. This is the mass of 50 mL of it.
What is 40 g?
This type of mixture has a uniform composition throughout, like salt water.
What is a homogeneous mixture?
The temperature at which a solid becomes a liquid.
What is melting point?
Melting, freezing, and dissolving sugar in water are examples of this type of change.
What is a physical change?
This is why density, not mass, can identify an unknown substance.
What is: density stays the same regardless of sample size?
A solid displaces water from 25 mL to 40 mL and has a mass of 45 g. This is its density.
What is 3 g/mL?
This type of mixture has visibly different parts, like a salad or granite.
What is a heterogeneous mixture?
The ability of a substance to dissolve in another substance.
What is solubility?
Bubbles form and the container feels warm when two clear liquids mix. This is evidence of this type of change.
What is a chemical change?
Two blocks of the same metal, one twice as heavy as the other, still share the same value for this property.
What is density?
A metal sample has a mass of 156.8 g and a volume of 20.0 mL. What is the density of the metal? Round your answer to the correct number of significant figures.
7.84 g/mL
This kind of property helps confirm a sample is a pure substance, since it stays constant no matter the sample size.
What is an intensive property (e.g. density)?
This property determines the melting point of an element
What is specific heat?