1. One of the essential minerals in the human body is salt. How much salt (NaCl) is in the average adult human body?

Salt comes in many forms. Colors are caused by slight impurities, but the primary chemical compound in table salt is sodium chloride.. Westend61, Getty Images
2. If you fill a glass to the brim with ice water and the ice melts, what will happen?
Glass of Ice Water. Martin Barraud, Getty Images
3. The symbol Sb stands for stibnum or stibnite. What is the modern name of this element?
Specimen of Native Antimony. De Agostini / R. Appiani, Getty Images
4. Water-based liquids can be described as acidic, neutral, or basic, with respect to pH. Which of these describes milk?
Girl Drinking a Glass of Milk. Tara Moore, Getty Images
5. DNA codes for proteins, which are the building blocks of organisms. What is the most abundant protein in the human body?
DNA Molecule. Scott Tysick, Getty Images
6. Noble gases are inert because they have completed outer electron shells. Which of these elements isn't a noble gas?
Brightly lit signs are often filled with low pressure noble gases.. Jill Tindal, Getty Images
7. What is the most common isotope of hydrogen?
These primordial stars are forming from hydrogen.. Stocktrek, Getty Images
8. You can't live without water! What is its chemical formula?
Ripples of Water. Yin Jiang / EyeEm, Getty Images
9. Who is credited with the invention of the modern periodic table?
Chemical elements are the stuff from which all matter is made.. Andrey Prokhorov, Getty Images
10. Which of these elements is a nonmetal?
Steel Pipes. artpartner-images, Getty Images
11. Organic chemistry is the study of the compounds that make up living organisms. All organic molecules contain:
Organic Chemistry - Benzene Molecule. Laguna Design, Getty Images
12. The symbol Ag stands for which element?
Periodic Table of Elements. Daniel Hurst Photography, Getty Images
13. Three of the most common states of matter are solids, liquids, and gases. A liquid has:
States of Matter. Dorling Kindersley, Getty Images
14. You can't live without iron. Where in the body is most of the iron located?
Pumping Iron. Mel Curtis, Getty Images
15. A mole contains Avogadro's number of items. What is Avogadro's number?
Mole. David Tipling, Getty Images
16. What do you call an atom that has more protons than electrons?
Atom. Ian Cuming, Getty Images
17. All of the following are amino acids except:
Antibody Protein Molecule. Science Picture Co, Getty Images
18. A drop of food coloring spreading out in a cup of water is an example of which transport process?
Food Coloring in Water. Keri Oberly, Getty Images
19. In a solution of saltwater (a saline solution), salt is the:
Saline Solution. Echo, Getty Images
20. All of the following elements are liquids around room temperature except which one?
Droplets of Liquid Mercury Metal. CORDELIA MOLLOY, Getty Images