basic chemistry PRE-TEST 2018
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1. Which of the following is the most important factor in determining an element’s place in the periodic table?
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2. Oxygen has an atomic number of 8. Which of the following elements would you expect to be most similar to oxygen in terms of its chemical properties?
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3. Potassium (K), atomic number 19, will most likely react with which of the following elements?
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4. In order to be identified as the element carbon (C), an atom must have ______.
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5. Group 1 (the alkali metals) includes lithium (Li), sodium (Na), and potassium (K). These elements have similar chemical properties because they have the same __________.
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6. The chemical properties of an element are determined by its:
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7. The atomic number of iron is 26, and the atomic mass is 55.847. What do these numbers mean in regard to protons, electrons and neutrons?
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8. Study the table below (table 1). Which element (i.e., atom) has a net positive (+) charge?
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table 1
9. Refer to diagram 2, Below. Which element in this group would be the least likely to react with other elements?
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Diagram 2
10. The graph (graph 1) below shows the percent by mass of six common elements in the human body. Element 6 is most likely
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graph 1
11. Carbohydrates, lipids, proteins, and nucleic acids are organic molecules essential for life. Which of the following elements makes the large structures of these organic molecules possible?
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12. Cellulose is a complex carbohydrate that makes up the cell walls of plants. Which of the following elements are main components of cellulose?
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13. Which of the following identifies the number and location of protons in a lithium atom?
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14. A sample of vinegar has a pH of 5, and a sample of rainwater has a pH of 6. Which of the following statements best describes these two substances?
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15. Which of the following statements describes what happens in a buffer solution when a strong acid is added?
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16. Based on valence electron configurations, which of the following is a formula for a compound formed from sodium (Na) and oxygen (O)?
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17. In question 16 above, what type of bond is "holding" the molecule sodium oxide together?
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18. Electrons are transferred from one element to another in a…
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19. Which of the following lewis structures are correct? see diagram 3 below
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diagram 3
20. Carbon has 4 valence electrons. As a result, it forms _________, covalent bonds with other atoms.
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21. Below is the structural formula for methane. (diagram 4). What type of bonds are "holding" this molecule together?
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diagram 4
22. In diagram 4 above, what would be it's proper molecular formula?
1 point
Periodic Table
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