Matter & Measurement

I answer the question “What is Chemistry?” to begin our series of videos in the course.

I explain the subtle but important difference in observations and inferences. Observations are statements of observable fact; inferences are conclusions drawn from observations and previous experience.

I explain how we describe pure matter: atoms, elements, molecules, and compounds.

There are a few ways to describe matter and how it changes. This video covers physical vs. chemical properties and changes.

When we do math with measurements, we often need to round the final answer to contain a certain number of significant figures. In this video, we look at how to determine the number of significant figures in a measurement.

When we do math with measurements, we often need to round the final answer to contain a certain number of significant figures. In this video, we look at how to round measurements to varying numbers of significant figures.

When we do math with measurements, we often need to round the final answer to contain a certain number of significant figures. In this video, we look at how to determine the number of significant figures needed in our final calculation.

Density is one of the most basic concepts in chemistry: mass per volume. Or stuff per space. In this video, we explore the density concept, its equation, a sample calculation, and one purpose behind using density…to identify a substance.

How good is your result? Percent Error is the best way to express that information. In this video, I explain how to do it.

Also known as dimensional analysis, factor-label method is used to convert a value from one unit into another using conversion factors.