science unit 2 review

3. a combination of two or more substances that are not chemically combined.
6. describes something that does not have a uniform structure or composition throughout.
8. change a change that occurs when one or more substances change into entirely new substances with different properties.
11. change a change of matter from one form to another without a change in chemical properties.
13. substance a sample of matter, either a single element or a single compound, that has definite chemical and physical properties.
14. a measure of the amount of matter in an object.
15. the amount of space that an object takes up, or occupies.
18. anything that has mass and takes up space.
19. the state of matter in which the volume and shape of a substance are fixed.

1. describes something that has a uniform structure or composition throughout.
2. the ratio of the mass of a substance to the volume of the substance.
4. property a property of matter that describes a substance’s ability to participate in chemical reactions.
5. a measure of the gravitational force exerted on an object; its value can change with the location of the object in the universe.
7. the state of matter that has a definite volume but not a definite shape.
9. a substance that cannot be separated or broken down into simpler substances by chemical means; all atoms of an element have the same atomic number.
10. the smallest unit of an element that maintains the properties of that element.
12. a substance made up of atoms or ions of two or more different elements joined by chemical bonds.
16. a subatomic particle that has a positive charge and that is located in the nucleus of an atom; the number of protons in the nucleus is the atomic number, which determines the identity of an element.
17. a form of matter that does not have a definite volume or shape.
20. of conservation of mass the law that states that mass cannot be created or destroyed in ordinary chemical and physical changes.