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Chem101|| ch2 part 2|Atoms molecules ,ions #chem101​​ شرح الفصل الثاني الذرات و الجزيئات و الايونات .


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شرح كيمياء 101 الفصل الثاني
الوحدة الثانية الايونات و الجزئيات
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كيمياء عامة 101
شرح كيمياء 101 جامعة الامام
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chem 101 chapter 2
ksu chem101

Chapter 2:
1
Name:………………………………………………………… Section: …………..
Homework Chapter 2
Atom Ion and Molecule
1. In a cathode ray tube
A) electrons pass from the anode to the cathode.
B) electrons pass from the cathode to the anode.
C) protons pass from the anode to the cathode.
D) protons pass from the cathode to the anode.
2. 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.
3. 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.
4. The scientist who determined the magnitude of the electric charge of the electron was
A) John Dalton. D) Henry Moseley.
B) Robert Millikan. E) R. Chang.
C) J. J. Thomson.
5. When J. J. Thomson discovered the electron, what physical property of the electron did
he measure?
A) its charge, e D) its mass, m
B) its charge-to-mass ratio, e/m E) its atomic number, Z
C) its temperature, T
Chapter 2:
2
6. Rutherford's experiment with alpha particle scattering by gold foil established that
A) protons are not evenly distributed throughout an atom.
B) electrons have a negative charge.
C) electrons have a positive charge.
D) atoms are made of protons, neutrons, and electrons.
E) protons are 1840 times heavier than electrons.
7. Which one of the following is an ion?
A) B
3+ B) NaCl C) He D) 14C E) none of the above
8. Which one of the following elements is most likely to form a 2+ ion?
A) beryllium B) carbon C) fluorine D) oxygen E) sodium
9. Two isotopes of an element differ in their
A) symbol. B) atomic number. C) atomic mass. D) number of protons. E) number of electrons.
10. Which row in the table is INCORRECT?
Symbol Protons Neutrons Electrons Charge
(a) 79Se2- 34 45 36 2-
(b) 107Ag+ 47 60 46 1+
(c) 55Mn 25 30 25 0
(d) 51V2+ 23 28 22 2+
(e) 130I
53 77 54 1-
11. What is the formula for the binary compound formed by potassium and nitrogen?
A) KN B) K2N C) NK2 D) K3N E) NK3
12. Predict the formula for the binary compound formed between barium and
phosphorus.
Chapter 2:
3
A) BaP B) Ba2P C) BaP2 D) Ba2P3 E) Ba3P2
13. Name the binary compound formed between barium and phosphorus.
A) barium phosphorus B) barium phosphide C) barium phosphate
D) barium diphosphate E) barium triphosphide
14. 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
15. The chemical name for ClO3
–
is chlorate ion. Therefore, the name of HClO3 is
A) hydrochloric acid B) chloroform C) hydrogen trioxychloride
D) chlorous acid E) chloric acid
16. The chemical name for ClO2
–
is chlorite ion. Therefore, the name of HClO2 is
A) hydrochloric acid B) chloroform C) hydrogen dioxychloride
D) chlorous acid E) chloric acid
17. Which of the following is the formula for hydrobromic acid?
A) KBr B) HBr C) HBrO D) HBrO2 E) HBrO3

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