Atoms, Molecules, and Chemical Bonds
12th Grade · Science · 45 min· 7.ps1.1 – Evaluate And Communicate Information That All Substances In The Universe Are Made Of Many Different Types Of Atoms That Combine In Various Ways. 7.ps1.2: Collect And Analyze Data About The Physical Properties Of The Components Of A Mixture To Use As Evidence That The Identities Of The Components Change During A Chemical Reaction.
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Learning Objective
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.
- 1
Matter can exist in three phases: solid, liquid, and gas. For example, water can be ice (solid), liquid water, or steam (gas).
- 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
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.
