Physical Properties
Physical Property
Characteristics that can be observed without changing the identity of a substance.
boiling point
Temperature at which a liquid changes into a gas.
Chemical Property
Describes how a substance changes into a new substance.
A substance always has its ____________ ______________ even when you cannot see them.
chemical properties
What is matter?
Anything that has mass and takes up space.
Because many physical properties remain ___________, you can use your observations of the properties to identify new substances.
Constant
melting point
What are chemical properties related to?
The specific elements that make up substances.
Reactivity
The capacity of a substance to combine with another substance (iron+oxygen=rust)
Matter is either an _________,___________, or a __________.
Element, compound, mixture
Physical properties can be _____________ or ______________.
observed measured
Flexible
Something is capable of bending easily without breaking.
How do substances change into new substances?
By combining with other elements or by breaking apart into new substances.
Some elements ______ very easily with other elements. (magnesium)
React
Atom
The smallest unit of an element
Durable
Something is able to withstand wear or damage.
Density formula
Density= Mass/Volume
Explain flammability with wood as an example.
Wood can be burned to form new substances. Even when wood is not burning it is flammable.
Explain substances that have similar chemical properties but different physical properties.
Wood and rubbing alcohol are both flammable but look different.
Heterogenous mixture
List 5 examples of physical properties:
Color, volume, mass, texture, strength, hardness, magnetism, electricity, heat
You can use your senses to observe (4) physical properties. What are they?
Shape, color, odor, and texture
Explain reactivity with iron as an example.
When exposed to oxygen, iron rusts.
Explain one difference (observation) between chemical and physical properties.
You can observe chemical properties only in situations in which the identity of the substance changes. Physical properties can be observed without changing the identity of the substance.
The number of molecules