Chemistry

2. an extremely small amount of a thing or quality
6. a supposition or proposed explanation made on the basis of limited evidence as a starting point for further investigation.
7. a colorless, odorless reactive gas, the chemical element of atomic number 8 and the life-supporting component of the air.
9. an optical instrument used for viewing very small objects, such as mineral samples or animal or plant cells, typically magnified several hundred times
11. a substance made by mixing other substances together
12. a chemical element or substance required in trace amounts for the normal growth and development of living organisms.
13. the strength and vitality required for sustained physical or mental activity
15. a chemical substance that neutralizes alkalis, dissolves some metals, and turns litmus red; typically, a corrosive or sour-tasting liquid of this kind.
16. a group of atoms bonded together, representing the smallest fundamental unit of a chemical compound that can take part in a chemical reaction
19. a dye obtained from certain lichens that is red under acid conditions and blue under alkaline conditions.
20. its symbol in the periodic table is "Ti"
24. the level of reactivity of a metal.
25. a particular kind of matter with uniform properties
26. the central and most important part of an object, movement, or group, forming the basis for its activity and growth.

1. it contains an adequate amount of all the nutrients required by the body to grow, remain healthy and be disease-free.
3. a colorless, odorless, highly flammable gas, the chemical element of atomic number 1
4. its symbol in the periodic table is "k"
5. is a process in which reactants react chemically and convert into products by chemical transformation
8. its symbol in the periodic table is "Al"
10. a stable subatomic particle with a charge of negative electricity, found in all atoms and acting as the primary carrier of electricity in solids
14. a substance that changes when it is combined with another substance in a chemical reaction
17. a scientific procedure undertaken to make a discovery, test a hypothesis, or demonstrate a known fact.
18. is the spatial arrangement of atoms in a molecule
21. its symbol in the periodic table is "s"
22. a substance that can accept hydrogen ions in water and can neutralize an acid.
23. is a dimensionless quantity representing the amount of matter in a particle or object.