Name _______________________________________________ Period _______________ Date ____________________
Alchemy Unit Practice Exam – 50 pts
Part I: Multiple Choice – 22 pts
Write the letter of the correct answer
_____ 1. Which of the following is considered matter?
(A) air
(B) an idea
(C) a dream
(D) energy
_____ 2. The piece of lab equipment pictured below is called a
(A) bunsen burner (B) graduated cylinder
(C) stirring rod (D) wire gauze
_____ 3. The least reactive group of elements on the periodic table is the
(A) alkali metals
(B) noble gases
(C) halogens
(D) transition metals
_____ 4. The symbol (s) stands for
(A) solid
(B) aqueous
(C) solution
_____ 5. Which part of an atom is positively charged?
(A) proton
(B) neutron
(C) electron
(D)gas
(D) valence electron
_____ 6. When an ion is created, the number of _________ are changed in the atom.
(A) protons
(B) electrons
(C) neutrons
(D) alpha particles
_____ 7. Which of the following is a metal?
(A) H
(B) W
(C) S
(D) I
_____ 8. Krypton (Kr)’s group is
(A) 4
(B) nonmetal
(C) halogen
(D) noble gas
_____ 9. Cesium (Cs)’s period is (period is same as row)
(A) 1
(B) 6
(C) alkali metal
(D) alkaline earth metal
_____ 10. The number of protons in a Na atom is (same as atomic number)
(A) 11
(B) 12
(C) 23
(D) 34
_____ 11. The number of neutrons most likely to be found in a boron atom is (atomic weight 10.8.
Closest whole number is 11)
(A) 5
(B) 6
(C) 10
(D) 11
_____ 12. The number of valence electrons in a calcium atom is.
(A) 2
(B) 4
(C) 20
(D) 40
_____ 13. The subshell that can be occupied by a maximum of 6 electrons is identified
by the letter
(A) s
(B) p
(C) d
(D) f
_____ 14. What element has the following electron configuration: [He]2s22p1?
(A) Li
(B) B
(C) Na
(D) Al
_____ 15. The color of flame produced when a sample of sodium chloride is burned.
(A) red
(B) blue/green
(C) yellow/orange (D) pink/lilac
_____ 16. When two elements combine to create a new element, it is called
(A) a chemical reaction
(B) a compound
(C) nuclear fission
(D) nuclear fusion
_____ 17. Isotopes of uranium have different
(A) numbers of protons
(C) atomic masses
(B) numbers of electrons
(D) atomic numbers
_____ 18. If polonium-212 (Po) undergoes beta decay, the result is (next element with same mass)
(A) radon-216
(B) astatine-212
(C) lead-208
(D) bismuth-212
_____ 19. Which of the following will NOT dissolve in water?
(A) Al (s)
(B) CaO (s)
(C) CuCl2 (s)
(D) LiF (s)
_____ 20. What type of bonding is found in methanol, CH3OH(l)?
(A) ionic
(B) metallic
(C) covalent network (D) molecular covalent
_____ 21. When a lithium atom forms an ion, its charge will be
(A) 1+
(B) 2+
(C) 2–
(D) 1–
_____ 22. The correct formula for aluminum oxide is
(A) AlO3
(B) Al2O3
(C) AlO
(D) Al2O
Part II: Short Answer - 16 pts
1. (2 pts) Write the electron configuration for a sulfur atom. 1s2 2s2 2p6 3s2 3p4
a. (2 pts) What would have to happen for a sulfur atom to have a noble gas electron configuration?
Gain 2 electrons to make 1s2 2s2 2p6 3s2 3p6
b. (1 pt) What charge would a sulfur ion have? 2c. (1 pt) Would a sulfur ion be a cation or an anion? anion
4
234
4
230
2. (2 pts) Complete the following nuclear reaction: 234
91Pa  2 He  91 Pa  2 He  89 Ac
a.
(1 pt) Is this alpha, beta, or gamma decay? alpha decay
b.
Is this an example of nuclear fusion or nuclear fission? (1 pt) This is fission
Explain (2 pts) - a larger atom is breaking up to smaller atoms. That is fission
3. (4 pts) Calcium reacts with bromine. What chemical formula would you expect for the resulting
compound? Explain your reasoning.
CaBr2 – Ca has 2 electrons, Br has 7. 2 + 2*7 = 16 to make multiple of 8.
Part III: Calculations - 12 pts
1. (2 pts) Calculate the mass of 65 mL of mercury. The density of mercury is 13.6 g/mL.
Density = mass/volume, 13.6 = x/65, mass = 13.6*65 = 884 g
2. (1 pt each) Answer the following questions for an atom with atomic number 9.
a. What is the symbol of the element?
F
b. What is the name of the element?
fluorine
c. How many protons does this atom have?
9
d. How many neutrons would this atom most likely have?
10
e. How many electrons does this atom have?
9
f. How many core electrons does this atom have?
2
g. How many valence electrons does this atom have?
7
h. Name two other elements with similar chemical properties.
chlorine
bromine
i. Is this atom a metal or a nonmetal?
non-metal