basic chemistry PRE-TEST 2018
1. Which of the following is the most important factor in determining an element’s place in the periodic table?
D. Atomic density
C. Atomic charge
A. Number of protons
B. Number of neutrons
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?
B. Fluorine (F)
D. Chlorine (Cl)
C. Sulfur (S)
A. Nitrogen (N)
3. Potassium (K), atomic number 19, will most likely react with which of the following elements?
D. Argon (Ar), because it is a noble gas.
A. Sodium (Na), because it is in the same column.
C. Chlorine (Cl), because it is a nonmetal.
B. Calcium (Ca), because it is in the same row.
4. In order to be identified as the element carbon (C), an atom must have ______.
C. 12 electrons
A. 6 protons
B. 6 neutrons
D. 12 electrons
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 __________.
A. numbers of protons and neutrons
C. numbers of protons in the nucleus
B. numbers of electrons in the outer energy level
D. numbers of neutrons in the nucleus
6. The chemical properties of an element are determined by its:
C. electron arrangement (valence electrons)
B. proton number.
A. atomic mass.
D. atomic size.
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?
C. There are 26 protons and 29 neutrons. Each particle has an atomic mass of 1.
D. There are 26 protons and 26 neutrons. Since neutrons have slightly more mass than protons, the mass is greater than 52.
B. There are 26 protons and 26 electrons. Some atoms of iron have 29 neutrons; the .847 shows that there is more than one isotope of iron.
A. There are 26 each of protons and neutrons, and the rest of the mass is the result of electrons.
8. Study the table below (table 1). Which element (i.e., atom) has a net positive (+) charge?
A. Element W
D. Element Z
C. Element Y
B. Element X
9. Refer to diagram 2, Below. Which element in this group would be the least likely to react with other elements?
10. The graph (graph 1) below shows the percent by mass of six common elements in the human body. Element 6 is most likely
chlorine and phosphorus
zinc and sulfur
carbon and oxygen
sodium and iron
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?
12. Cellulose is a complex carbohydrate that makes up the cell walls of plants. Which of the following elements are main components of cellulose?
carbon and hydrogen
potassium and chlorine
calcium and chlorine
sodium and hydrogen
13. Which of the following identifies the number and location of protons in a lithium atom?
3 protons, located in the nucleus
7 protons, located in the nucleus
3 protons, located in an atomic orbital
7 protons, located in an atomic orbital
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?
Both samples are bases, and rainwater is more basic.
Both samples are bases, and vinegar is more basic.
Both samples are acids, and rainwater is more acidic.
Both samples are acids, and vinegar is more acidic.
15. Which of the following statements describes what happens in a buffer solution when a strong acid is added?
The H+ ions from the strong acid combine with basic ions in the buffer.
The H+ ions from the strong acid combine with acidic ions in the buffer.
The OH– ions from the strong acid combine with basic ions in the buffer.
The OH– ions from the strong acid combine with acidic ions in the buffer.
16. Based on valence electron configurations, which of the following is a formula for a compound formed from sodium (Na) and oxygen (O)?
17. In question 16 above, what type of bond is "holding" the molecule sodium oxide together?
polar covalent bond
18. Electrons are transferred from one element to another in a…
polar covalent bond
polar covalent bond
19. Which of the following lewis structures are correct? see diagram 3 below
C and D only
A and B only
all of the above
20. Carbon has 4 valence electrons. As a result, it forms _________, covalent bonds with other atoms.
21. Below is the structural formula for methane. (diagram 4). What type of bonds are "holding" this molecule together?
all of these choices are correct
polar covalent bonds
22. In diagram 4 above, what would be it's proper molecular formula?
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