Unit A

Safety, Matter, & Measurement

Videos & Animations

What is Chemistry?

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

Observation vs. Inference

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.

Matter Classification

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

Properties of Matter

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

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 in a measurement.

Rounding

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.

Measurement Math

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

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.

Percent Error

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

Factor-Label Method (Dimensional Analysis)

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