Atom and Electrons

Topics: Atom, Electric charge, Electron Pages: 6 (1371 words) Published: June 26, 2013

Mark your answers in the answer sheet provided.
(NA = 6.022 x 1023)
1. Which one of the following is an example of a physical property? A) dynamite explodes D) ice floats on top of liquid water B) meat rots if it is not refrigerated E) a silver platter tarnishes C) gasoline burns

2. Which one of the following represents a physical change? A) water, when heated to 100°C, forms steam
B) bleach turns hair yellow
C) sugar, when heated, becomes brown
D) milk turns sour
E) apples, when exposed to air, turn brown

3. All of the following are properties of tin. Which one is a chemical property of tin? A) Tin can be hammered into a thin sheet.
B) At –400C a sheet of tin crumbles to a gray powder.
C) Tin melts at 231.9°C.
D) When a bar of tin is bent, it emits an audible “cry”. E) Tin erodes when added to hydrochloric acid, and a clear gas forms.

4. The elements in a column of the periodic table are known as A) metalloids. B) a period. C) noble gases. D) a group. E) nonmetals.

5. Which of the following elements is most likely to be a good conductor of electricity? A) N B) S C) He D) Cl E) Fe

6. An anion is defined as
A)a charged atom or group of atoms with a net negative charge. B)a stable atom.
C)a group of stable atoms.
D)an atom or group of atoms with a net positive charge E)isotope

7. Atoms of the same element with different mass numbers are called A) ions. B) neutrons. C) allotropes. D) chemical families. E) isotopes.

8. How many neutrons are there in an atom of uranium whose mass number is 235? A) 92 B) 143 C) 235 D) 238 E) 327

9. An atom of the isotope chlorine-37 consists of how many protons, neutrons, and electrons? (p = proton, n =neutron, e = electron)
A)17 p, 18.45 n, 17 eD) 17 p, 37 n, 17 e
B)17 p, 20 n, 7 eE) 20 p, 17 n, 20 e
C)17 p, 20 n, 17 e

10. Which one of the following elements is most likely to form a 2+ ion? A) beryllium B) carbon C) fluorine D) oxygen E) sodium

11. An aluminum ion, Al3+, has:
A)13 protons and 13 electronsD)13 protons and 10 electrons B)27 protons and 24 electronsE)10 protons and 13 electrons C)16 protons and 13 electrons

12. An oxide ion, O2–, has:
A)8 protons and 10 electronsD)8 protons and 7 electrons B)10 protons and 8 electronsE)10 protons and 7 electrons C)8 protons and 9 electrons

13. An iron(II) ion has:
A)24 electrons and a charge of 2+D)28 electrons and a charge of 2+ B)24 electrons and a charge of 2–E)28 electrons and a charge of 2–
C)26 electrons and a charge of 2+

14. Which of the following pairs of elements would be most likely to form an ionic compound? A) P and Br B) Cu and K C) C and O D) O and Zn E) Al and Rb

15. Given that the ion ClO3– is named chlorate, what is the ion ClO4– named? A) chloride B) chlorite C) hypochlorite D) perchlorite E) perchlorate

16. Which is the correct formula for copper(II) phosphate? A) Cu2PO4 B) Cu3(PO4)2 C) Cu2PO3 D) Cu(PO4)2 E) Cu(PO3)2

17 . The formula for dinitrogen tetroxide is
A) N2O4. B) N2O5. C) NO. D) N4O2. E) NaO4

18.The correct name for CuSO4·5H2O is
A)copper sulfate acid.D)copper(II) sulfate pentahydrate. B)copper sulfate pentahydrate.E)copper(V) sulfate hydrate. C)copper(II) sulfate acid.

19. The correct name for KHCO3 is
A)calcium bicarbonate.D)calcium hydrogen carbon trioxide. B)calcium carbonate.E)potassium hydrogen carbonate.
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