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
In what situation would the displacement of an object in motion be zero?
When the object starts and stops its motion in the exact same place.
How is speed different from velocity?
Mathematically, they are the same, but velocity includes the DIRECTION of the object in motion.
What information does the slope of a distance-time graph give you?
What information does the slope of a speed-time graph give you?
What does a curved line on a distance-time graph indicate?
The rate of speed is changing
What does a steeper line on a distance-time graph indicate?
An object moving at a higher speed will have a steeper line.
When the acceleration of an object is calculated and the answer is a negative number, what does that tell you?
That the object has negative acceleration, which means it is slowing down.
What does a horizontal line (across from side to side) on a distance-time graph indicate?
That the object is not moving (covers no distance)
What does a horizontal line (across from side to side) on a speed-time graph indicate?
That the object is moving at a constant speed
What is the acceleration of a car that is traveling at a rate of 2m/s and continues at that rate as it completes a turn towards the West?
Acceleration = 0m/s2 West - The only change is the direction of the moving object
*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.