In this lesson our instructor talks about properties of matter. First, she discuses matter, physical properties and physical changes. Then she talks about chemical properties and chemical changes. Four complete example videos round up this lesson.
Matter is anything that has
mass or takes up space.
All matter is made up of one or
Matter that is pure and made up
of a fixed composition is a pure substance.
A pure substance has a fixed
composition, can be an element or a compound which is made up of
more than one element. Compounds have different properties of
elements that are bonded to form compounds
A mixture is made up of more
than one pure substances
A heterogeneous mixture is
where each component of the mixture is unevenly mixed and visible.
If the particles settle in a liquid, the mixture is a heterogeneous
A homogeneous mixture is where
the components of the mixture are evenly mixed and not visible. If
the particles are dissolved, the mixture is a solution. If the
particles are suspended, the mixture is a colloid.
A physical property is a
characteristic that can be observed without being changed, like
appearance, magnetism, and ductility.
A physical change is a change
in a physical property where no new substance is formed.
A chemical property is a
characteristic that indicates the ability of the substance to change
into a new substance such as flammability or reactivity to light.
A chemical change is a change
in a chemical property where a new substance is formed.
Properties of Matter
Since elements and compounds both have fixed compositions, they are classified as ______?
How would you classify a mixture in which visible particles settle?
A heterogeneous suspension.
What type of property can be observed without being changed?
A physical property
Physical properties can be based on ______ such as size, shape, and state of matter or ______ such as viscosity or ductility.
What type of change does not form a new substance?
A physical change
What process can you use to separate pure water from the mixture that we call coffee?
Use distillation to boil the pure water to separate it from the tiny coffee grounds in a cup of coffee.
If an object burns, has it undergone a chemical change or a physical change? Why?
A chemical change because it has changed into a different type of matter.
What type of change has occurred when you mix a solid and a liquid together and you see a flash of light and hear a popping sound?
A chemical change since both sound formation and light are signs of a chemical change.
When does a physical change occur?
A physical change occurs when a physical property changes.
What types of change(s) occur when a metal liquid is cooled and then pounded into a sheet?
Both changing from a liquid to a solid (state change) and pounding into a sheet (malleability) are physical changes.
*These practice questions are only helpful when you work on them offline on a piece of paper and then use the solution steps function to check your answer.
Properties of Matter
Lecture Slides are screen-captured images of important points in the lecture. Students can download and print out these lecture slide images to do practice problems as well as take notes while watching the lecture.