Week 2.docx - 1 Which four elements are the primary...

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1. Which four elements are the primary components of important biological molecules, such as proteins, fats and carbohydrates? Carbon, hydrogen, calcium, nitrogen *Carbon, hydrogen, oxygen, nitrogen Sodium, hydrogen, oxygen and water Calcium, nitrogen, carbon and nitrogen 2. Which of the following is a compound? *Lactose Liquid nitrogen Sodium Hydrogen gas 3. As of 2010, there were 118 known elements. Of those how many are believed to be essential to human biology? *25 92 11 all of them 4. A substance that cannot be broken down into other substances by ordinary chemical procedures is a(n) _____. Molecule *Element Compound Electron 5. Compounds are composed of atoms joined together only with covalent bonds True *False 6. Compounds always have polarity True *False 7. Compounds are composed of two or more elements in a fixed ratio to each other. *True False 8. Trace elements ______ can be used as labels to trace atoms through an organism’s metabolism are very rare on Earth *are required in very small amounts enhance health but are not essential for long-term survival. 9. Which of the following is a trace element?
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Calcium Hydrogen *Iodine Carbon 10. Which of the following would be considered a trace element in the human body? Na Ca Ti *Fe 11. What is table salt supplemented with to prevent goiter? Fluoride Iron *Iodine Calcium 12. An atom and an ion of the same element differ in their number of *neutrons electrons protons either protons or neutrons 13. Which of the following has the smallest mass? Atom Proton *Electron Neutron 14. Which of the following subatomic particles has appreciable mass and lacks a charge? *Neutron Proton Electron Element 15. In an uncharged atom the number of protons will always equal the _____ number of neutrons *number of electrons mass number Avogadro’s number 16. An element has 9 protons, 10 neutrons and 9 electrons. Its atomic number and its mass number, respectively are ______.
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