Mrs Hull's Classroom
- Be on time
- Come to class prepared
- Be respectful
- Be careful and obey all laboratory safety guidelinesguidelines
1st Six Weeks
- Classroom Requirements
- Introduction to Science
- Laboratory safety unit
Students know an element is a pure substance represented by chemical symbols.
The student is expected to recognize a limited number of the many known elements comprise the largest portions of solid Earth, living matter, oceans, and atmosphere. Additionally, students differentiate between elements and compounds on the most basic level.
1.An element is a pure substance that cannot be broken down into simpler substances. An atom is the smallest particle of an element maintaining the chemical identity of that element.
2.All known elements are represented on the Periodic Table of Elements. Elements are represented by one or two-letter chemical symbols.
3.The solid parts of Earth are made of mostly oxygen and silicon. Living matter is mainly made of oxygen, carbon, hydrogen, nitrogen, calcium and phosphorus.
4.The oceans are mainly made of oxygen and hydrogen, which are the elements in water. The atmosphere is mainly made of nitrogen and oxygen.
5.A substance that contains two or more different elements is a compound.
The student is expected to: identify the formation of a new substance by using the evidence of a possible chemical change. These changes include gas production, temperature change, precipitate production, or color change.
1.A chemical change occurs when elements bond together or when bonds of compounds are broken and form a new substance.
2.A new substance forms from a chemical change. It may have different properties than those of the original substance.
3.We often observe signs of a chemical change by the gas production, precipitate formation, absorption or energy release in the form of heat or light, a color change or odor formation.