Atoms, Molecules, and Chemical Bonds

I can evaluate and communicate information that all substances in the universe are made of many different types of atoms that combine in various ways.

4:15

We don't generate video — this one is by Professor Dave Explains on YouTube. The practice questions and exit ticket below were drafted by AI for this objective, and every question is editable in the teacher guide.

1. 1

   Matter can exist in three phases: solid, liquid, and gas. For example, water can be ice (solid), liquid water, or steam (gas).

2. 2

   A physical change does not alter the chemical composition of a substance, like melting ice, while a chemical change involves the breaking and forming of chemical bonds to create new substances, such as hydrogen and oxygen combining to form water (H₂O).

3. 3

   Mixtures are combinations of two or more pure substances that can be separated by physical processes; these can be homogeneous, like sugar and water, or heterogeneous, like oil and water.

“Describe the difference between a physical change and a chemical change. Give an example of each, based on the video.”

Sample answer included in the free materials