MS Physical Ch. 4

3. The substances that make up salt water can be present in ___ amounts
6. An ion is formed when an atom gains or loses an ___
7. A compound can be separated by ___ means
10. In a mixture, substances will keep their ___
13. Carbon atoms can join other atoms in a single, double, or triple
14. A substance made up of two or more elements that have chemically combined is a
15. The body’s stored energy supply comes from
17. A molecule of water contains two hydrogen atoms joined to one ___ atom
18. Organic compounds used to build and repair the body are

1. Two or more substances that have been combined but not chemically changed
2. A solid that contains atoms arranged in a regular pattern is a ___
4. Atoms can complete their outer energy levels by gaining, losing, or sharing their ___
5. A neutral atom becomes a positive ion when it ___ an electron
7. Organic compounds contain the element ___
8. An organism’s main source of energy comes from
9. Cholesterol can be a harmful
11. In a covalent compound, electrons are ___
12. A molecule of sugar contains carbon and ___ and oxygen
16. An example of a type of carbohydrate is