Elements, Compounds, and Mixtures

2. is the part of an experiment that is NOT being tested and that is used for comparison.
6. The first step of the scientific method is to identify the
10. a group of atoms chemically bonded together representing the smallest unit of a chemical compound
11. the element that is found in all four of the Earth's systems
12. The information collected during an experiment is called
13. physical and chemical characteristics of matter
15. variable is the part of the experiment that is affected by the changed variable
17. how much space the matter occupies
18. combination of letters used to indicate the chemical composition of a substance
19. Scientists make _______________________ (using their senses) to help them make a
20. a pure substance that cannot be broken down into any other substance
21. the smallest particle of an element maintaining the chemical identity of that element

1. shorthand that uses one or two letters to represent elements
3. made of a blend of elements or compounds; not a pure substance
4. credited with organizing elements into a table based on properties
5. type of substance has constant composition and constant properties
7. the ratio or distribution of individual substances that make up matter
8. is a possible solution to a problem. It is always testable
9. the measure of how much matter is in a substance
10. anything that has mass and takes up space
14. variable is the part of the experiment that is being tested and changed by the scientist
16. a pure substance that has been chemically bonded to form a new substance